preferred embodiments of the present invention will be described in detail with reference to the drawings , so that the purposes , the characteristics and the advantages of the invention can be more clearly understood . it should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention , but for describing the essential spirit of the technical scheme of the invention . fig2 is a schematic diagram of an intake system of engine 100 with an auxiliary intake assembly according to an embodiment of the present invention . as shown in fig2 , the intake system of engine 100 comprises an air filter 1 , a turbocharger 2 , an intercooler 3 , an auxiliary intake assembly 4 , an electronic throttle 5 , an intake manifold main pipe 6 and an intake manifold 7 in sequence in the air flow direction , as well as a intake pipe 8 and an exhaust pipe 9 which connected with the components mentioned above . the air filter 1 is located at an inlet of the intake pipe 8 . the auxiliary intake assembly 4 is arranged on a intake pipe between the intercooler 3 and the electronic throttle 5 . in the embodiment , the auxiliary intake assembly 4 is used as a separate assembly which is connected to the intake pipe 8 in series after being manufactured . it should be understood that the auxiliary intake assembly or part thereof can be integrally formed on the intake pipe during manufacturing . a boost pressure sensor 11 is arranged in a intake pipe between the electronic throttle 5 and the auxiliary intake assembly 4 , and is used for detecting the actual pressure ( also referred to as the boost pressure ) in the intake pipe located upstream of the electronic throttle . an air inlet pressure sensor 12 is arranged in a pipe located downstream of the electronic throttle 5 , and is used for detecting the pressure ( namely the air inlet pressure ) of the air inlet cavity at the downstream of the electronic throttle . a controller ( not shown ) of the auxiliary intake assembly 4 receives the air inlet pressure , the boost pressure , engine rotating speed , the position of the electronic throttle and other engine state information , controls the boost of the auxiliary intake assembly to form a closed - loop control on the target of the boost pressure . in addition , an air flow meter 13 is further arranged in the intake pipe between the air filter 1 and the turbocharger 2 , and is used for detecting the amount of air entered . some of the traditional intake system of engine further comprises an exhaust gas recirculation device ( egr ) 14 . during operation , a first fresh air enters the engine intake pipe through the air filter 1 , and then enters the air compressor end 2 a of the turbocharger 2 through the air flow meter 13 . then , the high - temperature and high - pressure air is cooled into air with lowered temperature through the intercooler 3 after being supercharged by the air compressor 2 a , and then the air enters the auxiliary intake assembly 4 . meanwhile , a second fresh air is inhaled by the air inlet of the auxiliary intake assembly 4 . after being supercharged by the auxiliary intake assembly 4 , the second fresh air and the first fresh air are combined into a pressurized air . then , the pressurized air enters the intake manifold main pipe 6 after passing through the electronic throttle 5 , and then is inhaled into an engine cylinder 10 after being distributed through an intake manifold 7 . fig2 a is a system diagram of a variation of an intake system of engine with the auxiliary intake assembly of fig2 . the embodiment shown in fig2 a differs from the embodiment shown in fig2 in that a second throttle 52 is further provided . the second throttle 52 is arranged in a intake pipe upstream of the auxiliary intake assembly 4 . the function of the second throttle 52 is to prevent the air flow entering the main pipe through the auxiliary intake assembly from flowing back to the air inlet end of the upstream turbocharger through adjust the opening degree of the valve of the second throttle , so that the pressurized air provided by the auxiliary intake assembly effectively enters the cylinder , and the effect of rapid boost is achieved . preferably , the second throttle 52 is arranged close to the auxiliary intake assembly . the distance between the second throttle 52 and the auxiliary intake assembly ranges from 5 mm to 500 mm . fig3 illustrates a cross - sectional perspective view of an auxiliary intake assembly 4 according to an embodiment of the present invention . as shown in fig3 , the auxiliary intake assembly 4 comprises an inner tube 16 and an outer tube 17 . the inner tube and the outer tube define a central passage 39 together . the central passage 39 is communicated with the intake pipe 8 , which will be further described . one end of the inner tube 16 is hermetically connected to one end of the outer tube 17 , and the other end of the inner tube 16 extends into the outer tube , so that an air chamber 18 is formed between the inner tube 16 and the outer tube 17 . the pressure of the gas in the air chamber 18 is greater than the pressure of the gas in the intake pipe during operation , and therefore the air chamber 18 is also referred to as a boost cavity . an auxiliary air inlet 19 is formed on the side wall of the outer pipe 17 , and the auxiliary air inlet 19 is communicated with an external air inlet pipe 20 . the auxiliary air inlet 19 and the external air inlet pipe 20 jointly form an auxiliary air inlet passage . an auxiliary air outlet passage 21 is further formed between the inner tube 16 and the outer tube 17 . the auxiliary air outlet passage 21 has a preset length and extends along the air flow direction of the intake pipe 8 , so that the flow direction of the air flow coming out of the auxiliary air outlet passage 21 is basically parallel to the traveling direction of the air flow coming from the intake pipe 8 . air flow from an auxiliary air source ( typically ambient air ) enters through an auxiliary air inlet passage and flows through the air chamber 18 , and then flows out from the auxiliary air outlet passage 21 and enters the central passage 39 and is mixed into the air flow of the intake pipe 8 . the air source can be directly supplied by surrounding air or can be supplied by an electric supercharger which has an impeller driven by a motor to rotate . preferably , the air flow of the electric supercharger is an axial flow or a centrifugal flow when passing through the blades . alternatively , the gas source may be provided by a compressor . alternatively , the gas source can be from a gas released from a high - pressure air storage tank . preferably , the high - pressure air storage tank can be inflated by a hydraulic pump or an electric pump . in one embodiment , the electric supercharger or the high - pressure air storage tank of the auxiliary intake assembly is driven by a vehicle - mounted battery , wherein a part of power of the vehicle - mounted battery is from a vehicle brake energy recycling system which is used for reversely charging the battery . in the embodiment shown in fig2 , the air source is from an electric supercharger which has an impeller driven by a motor to rotate . specifically , as shown in fig2 , an air inlet of the auxiliary intake assembly is connected with a base 50 . an air inlet 50 a and an air outlet are formed in the base 50 . the air inlet 50 a is communicated with the surrounding air . the air outlet is connected to the air inlet of the auxiliary intake assembly . a fan , a motor and a controller ( not shown ) are arranged in the base 50 . the controller controls the motor to rotate so as to drive the fan to rotate , such that the air is blew into the auxiliary intake assembly . the motor , the controller and the like are powered by a power supply device 51 , and the power supply device is for example a battery , a super capacitor or a generator . as shown in fig4 - 6 , the inner tube 16 is provided with an inner annular flow guiding portion 22 and an inner annular connecting portion 23 . the inner annular flow guiding portion 22 extends from the inner annular connecting portion 23 towards the outer annular connecting portion 30 of the outer tube 17 , ie . extends in a direction opposite to the flow direction of the air flow in the intake pipe 8 . the outer diameter of the inner annular flow guiding portion 22 is smaller than the inner diameter of the inner annular connecting portion 23 . the outer diameter of the inner annular flow guiding portion 22 is smaller than the inner diameter of the tubular body of the outer tube 17 , so that the inner annular flow guiding portion 22 can be contained in the outer tube 17 . the inner annular flow guiding portion 22 is provided with a first segment 24 and a second segment 25 extending from the inner annular connecting portion 23 . the first segment 24 is trumpet - shaped and narrowed in a direction opposite to the flow direction of the air flow in the intake pipe . the second segment is gradually widened in the direction opposite to the flow direction of the air flow in the intake pipe and is in a trumpet - shape . it is understood that the first segment and / or the second segment can also be substantially cylindrical , that is , the diameter of the inner annular flow guiding portion in the extending direction is not changed . the outer tube 17 is provided with a tubular body 29 , an outer annular flow guiding portion 32 and an outer annular connecting portion 30 . the outer annular flow guiding portion 32 is provided inside the tubular body 29 and extends from the outer annular connecting portion 30 towards the inner annular connecting portion 23 , ie . the outer annular flow guiding portion 32 extends in a same direction as the flow direction of the air in the intake pipe 8 . the inner side surface of the inner tube 16 and the inner side surface of the outer annular flow guiding portion 32 of the outer tube 17 form a central passage 39 together . the central passage 39 is communicated with the main air inlet passage of the intake pipe 8 . the outer diameter of the outer annular flow guiding portion 32 is smaller than the inner diameter of the second segment 25 of the inner annular flow guiding portion 22 of the inner tube 16 . at least a portion of the inner annular flow guiding portion 22 surrounds at least a portion of the outer annular flow guiding portion to form an auxiliary air outlet passage 21 . the auxiliary air outlet passage 21 is an annular passage and has a preset length . preferably , the distance between the upper wall and the lower wall which define the annular passage is 0 . 3 - 5 mm . preferably , the cross section of the annular passage is in an annular shape or an oval shape . the preset length of the auxiliary air outlet passage is 1 mm - 25 mm . preferably , the preset length is 5 - 20 mm . in another embodiment , the auxiliary air outlet passage 21 can be composed of a plurality of sections of narrow passages spaced apart from each other . in another embodiment , the auxiliary air outlet passage 21 is composed of a plurality of sections of separated arc - shaped passages . the outer annular flow guiding portion 32 is gradually narrowed in the flow direction of the airflow in the intake pipe , and then the inner diameter thereof become smallest at the outlet of the auxiliary air outlet passage . in one embodiment , the length of the outer annular flow guiding portion 32 is smaller than the length of the inner annular flow guiding portion 22 . in one embodiment , the length of the outer annular flow guiding portion 32 is smaller than or equal to the length of the second segment 25 of the inner annular flow guiding portion 32 . an annular flow guiding plate 26 is arranged at the inlet of the auxiliary air outlet passage 21 and is used for guiding airflow to flow towards the outlet of the auxiliary air outlet passage . as shown in fig4 , the annular guiding plate 26 extends integrally from the end of the second segment 25 of the inner tube 16 . the surface of the annular flow guiding plate 26 is designed to guide the airflow to form a surface shape which can achieve a coanda effect . an air chamber 18 is formed between the inner side surface of the tubular body of the outer tube and the outer surface of the inner annular flow guiding portion of the inner tube . the shape and the size of the air chamber are arranged to pressurize air entering from the auxiliary air inlet passage , and guide the air flow from the auxiliary air inlet passage towards the auxiliary air outlet passage . the auxiliary air inlet passage and the auxiliary air outlet passage are communicated through the air chamber 18 . the auxiliary air outlet passage 21 is narrowed relative to the air chamber 18 . one end 28 of the inner annular connecting portion of the inner tube 16 is connected to one end 33 of the tubular body 29 of the outer tube 17 , for example , through buckling connection , welding or bonding . the other end 27 of the inner annular connecting portion is connected to the intake pipe 8 . one end of the inner annular flow guiding portion 22 is connected to ( integrally formed in the drawings ) the inner annular connecting portion 23 and the other end of the inner annular connecting portion 23 is a free end . an outer annular connecting portion 30 of the outer tube 17 is integrally formed with the tubular body 29 and the outer annular flow guiding portion 32 . one end 31 of the outer annular connecting portion 30 is connected to the intake pipe 8 . one end of the outer annular flow guiding portion 32 is connected to the outer annular connecting portion 30 , and the other end of the outer annular flow guiding portion 32 is a free end . it should be noted that in the embodiment shown in fig3 - 6 , the inner tube is an integrated piece , and the outer tube is an integral piece . the inner tube and the outer tube are mutually connected hermetically to form the auxiliary intake assembly with the air chamber 18 and the auxiliary air outlet passage 21 . it should be understood that the inner tube can be formed by a plurality of parts separately manufactured and then assembled . the outer tube can also be formed by a plurality of parts separately manufactured and then assembled . alternatively , the outer tube and the inner tube can be integrally formed . in addition , in the embodiment mentioned above , the auxiliary intake assembly is a separate independent component and is connected to the intake pipe in series . it is understood that all or a part of the auxiliary intake assembly can be integrally formed with the intake pipe . when the auxiliary intake assembly works , the inhaled air is pressurized by the auxiliary intake assembly and then enters the auxiliary air outlet passage . the annular gap of the auxiliary air outlet passage enables the air to be squeezed at the annular gap , so that the air is accelerated to be blown out , and an overlapped air flow which has a flow direction consistent with the airflow direction in the original intake pipe is formed , and the air flow in the intake pipe is driven to accelerate to flow to the engine cylinder , so that boost is realized . fig7 - 8 b show a structural schematic diagram of an auxiliary intake assembly 4 ′ according to another embodiment of the present invention . the embodiment shown in fig7 - 8 b differs from the embodiment shown in fig4 in that the embodiment shown in fig7 - 8 b further provide a fluid adding device 34 , and the rest is the same and is not described in detail herein . the fluid adding device 34 is used for adding fluid such as water , methanol or ethanol and mixtures thereof into the intake pipe , so that other functions such as auxiliary combustion can be realized . preferably , under a low - speed and full - load working condition , in a single combustion , the mass ratio of atomized water to gasoline in the cylinder is 1 : 3 . preferably , the auxiliary air inlet can be pressurized after the engine is shut down , such that liquid water in the nozzle and the pipe is reversely pressed back into a water tank or pulled out , thus residual liquid water in the pipe can be prevented from being frozen , and the residual liquid water in the pipe can be prevented from going bad in the pipe for a long time . in the embodiment shown in fig7 , the fluid adding device 34 is a nozzle 34 . the nozzle 34 is detachably installed on the auxiliary intake assembly 4 . the nozzle is located on the air outlet side of the auxiliary air outlet passage 21 , passes through the outer tube 17 , the air chamber 18 and the inner tube 16 , and then is communicated with the central passage 39 . in particular , a passage 35 is defined inside the nozzle 34 for liquid to be transferred from the inlet 38 of the nozzle to the outlet 37 of the nozzle . at least one air inlet hole 36 is defined on the nozzle side wall 40 defining the passage 35 . the air inlet hole 36 is in fluid communication with the air chamber 18 . the outlet 37 of the nozzle 34 is in communication with the central passage 39 . the inlet 38 of the nozzle 34 is connected to a liquid source 41 ( see fig . ), so that the nozzle 34 sprays the liquid from the liquid source into the intake pipe 8 . in the embodiment , the nozzle 34 inhale liquid into intake pipe through the pressure difference generated by the internal air flow of the auxiliary intake assembly . the liquid is atomized and then is mixed with air in the intake pipe and then inhaled into the cylinder together . in one embodiment , the pressure difference ranges from 10 kpa to 100 kpa . preferably , the pressure difference is 35 - 75 kpa . preferably , the outlet 37 of the nozzle 34 is located on one side , which is close to the cylinder , of the auxiliary air outlet passage 21 and is separated from the outlet of the auxiliary air outlet passage by a preset distance . preferably , the predetermined distance is set such that the air flowing out of the auxiliary air outlet passage can directly act on the liquid flowing out of the outlet of the nozzle to atomize the liquid . preferably , the preset distance is 2 - 50 mm , and more preferably , the preset distance is 5 - 15 mm . in fig7 , ten air inlets 36 are shown . it should be understood that the amount of the air inlet holes 36 can be two , four or six or other suitable amounts . the diameter of the air inlet hole is 0 . 3 - 1 mm . preferably , the diameter of the air inlet hole is 0 . 75 mm . in one embodiment , the liquid flowing inside the nozzle is pure water , and the nozzle is used for humidifying air in the intake pipe . in another embodiment , the liquid flowing inside the nozzle is a mixture of water and methanol or ethanol , wherein methanol or ethanol has the effects of combustion improver and inhibition of icing when at low - temperature . in one embodiment , the liquid source is a liquid source with pressure , or a pipe between the inlet of the nozzle and the liquid source is provided with a pressure pump . as shown in fig9 , a flow control valve 42 is arranged on a pipe 43 between the inlet of the nozzle 34 and the liquid source 41 , such as an electromagnetic valve , and is used for controlling the liquid flow . the liquid source 41 is a water tank . the water tank 41 , the pipe 43 , the flow control valve 42 and the nozzle 34 form a liquid adding device together . in one variation , there may be no air inlet hole on the side wall of the nozzle , and the fluid adding device sprays liquid into the pipelines of the auxiliary intake assembly through the nozzle using a siphon principle . for example , as shown in fig1 , the auxiliary intake assembly 4 ′ is also provided with a vent pipe . one end of the vent pipe 44 is communicated with the intake pipe 8 or a central passage 39 upstream of the auxiliary intake assembly , and the other end of the vent pipe 44 is communicated with a pipe 43 between the nozzle 34 and the liquid source 41 , or the other end of the vent pipe 44 is communicated with the sealed liquid source storage tank . the pressure upstream of the auxiliary intake assembly 4 ′ is larger than the pressure of the outlet of the auxiliary air outlet passage . the liquid is inhaled into the nozzle upwards and is sprayed out from the outlet of the nozzle , and meanwhile , the liquid is atomized . in the embodiments above , the liquid source needed by the nozzle can be rainwater guided and collected from the front windshield of the vehicle , or can be water discharged from the exhaust manifold of the vehicle , or can be condensed water accumulated outside the condenser of the air conditioning condenser , or can be water manually injected into the water tank . in one embodiment , a plurality of nozzles are provided along the circumference of the auxiliary intake assembly . generally the plurality of nozzles are provided along the circumference of the outer tube . in another embodiment , the nozzle is simultaneously used as a connector for the inner tube and the outer tube . the fluid adding device provided on the intake system of engine has the following main advantages : 1 . air inhaled into the cylinder is cooled , and the density of the air entered is improved , and then the amount of the air entered is increased . 2 . suppressing knocking and preburning by reducing temperature in cylinder . 3 . the compression ratio of the engine is improved , and the engine is enabled to generate larger torque . 4 . simple and efficient fuel consumption method , and especially low - rotation - speed large - load working condition 5 . the exhaust temperature is achieved through water spraying , especially at the working condition of high - rotating - speed and large - load working conditions , thus reducing the exhaust temperature by spraying concentrated gasoline , like the traditional engine , is avoided and meanwhile , the fuel - saving effect is achieved . fig1 - 14 is a perspective view of an auxiliary intake assembly 4 ″ according to yet another embodiment of the present invention . as shown in fig1 and 12 , in the embodiment , the auxiliary intake assembly is in the form of an electric supercharger 4 ″. therefore , in the following description of the embodiment , the auxiliary intake assembly is referred to as an electric supercharger 4 ″. the electric supercharger 4 ″ comprises a base 41 ″ and a boost pipe 42 ″ which is in fluid communication with the base . the side wall of the base 41 ″ is provided with an air inlet 411 ″. preferably , the air inlet 411 ″ is arranged around a housing of the base . a second air filter 415 ″ is further arranged in the base 41 ″ and is used for filtering the air entering the base . a motor 412 ″ and fan blades 413 ″ are arranged in the base . the motor 412 ″ is connected with a vehicle - mounted battery ( not shown ) so as to obtain power supply and is connected with the motor controller 43 ″ so as to be controlled . preferably , the motor is a switched reluctance motor . preferably , the motor 411 ″ is located on the air outlet side of the fan blade , namely behind the fan blade . the motor drives the fan to rotate , and air flow stirred by the fan enters through the front of the fan blade and is discharged from the rear of the fan blade . the airflow blown out by the fan blows through the motor and then enters the airflow pipe , and the purpose of cooling the motor can be achieved since the motor is located behind the fan blades . meanwhile , the motor housing plays a role in guiding the air flow blown out by the fan . preferably , the motor housing is provided with a blade - shaped flow guide . an interface 414 ″ is arranged on the base 41 ′ and is used for being connected with a motor controller 38 ″. the motor controller 38 ″ can be in communication with a control system ( not shown ) of a vehicle . preferably , the motor control function can also be integrated in an engine control unit ( ecu ). the ecu directly controls the electric supercharger to work according to the running state of the engine . the boost pipe 42 ″ is a tubular member , which is connected in series with an intake pipe of the engine and is in fluid communication with the intake pipe . specifically , one end of the boost pipe 42 ″ is provided with a buckle 421 ″, and a flange 422 ″ is arranged at the other end . one end of the intake pipe located on the air filter side is connected with the boost pipe in series through the buckle , and the other end of the intake pipe positioned at the cylinder side is connected with the boost pipe in series through a flange and a bolt . in another embodiment , one end of the intake pipe located on the air filter side is connected with the boost pipe in series through a silica gel pipe , and is fixed through a hoop . the other end of the intake pipe positioned at the cylinder side is provided with a flange , and the corresponding end of the boost pipe is also provided a flange , wherein the intake pipe is connected with the boost pipe through the flanges and bolts . in another embodiment , the intake pipe and the boost pipe are both provided with flanges , and the intake pipe and the boost pipe are connected through flanges and bolts . a first airflow passage 423 ″ which is in fluid communication with the intake pipe is arranged in the center of the boost pipe 42 ″. a second airflow passage 424 ″ is formed between the inner tube wall 426 ″ defining the first airflow passage 423 ″ and the outer tube wall 425 ″ of the boost pipe . the air inlet 4241 ″ of the second airflow passage 424 ″ is in fluid communication with the base 41 ″, and an air outlet 4242 ″ of the second airflow passage is in fluid communication with the first airflow passage 423 ″. during operation , the motor 412 ′ drives the fan blades 413 ′ to rotate , so that the air flow ( eg , ambient air or other gas ) flows through the air inlet 4241 ″, and flows out from the air outlet 4242 ″ and is mixed with the air flowing through the intake pipe so as to form a boost gas which is inhaled into the cylinder of the engine , as shown in fig1 and 14 . in the embodiment shown in fig1 and 12 , the air outlet of the boost pipe 42 ″ is an annular gap 4242 ″. an inlet of the annular gap 4242 ″ is in fluid communication with the base 41 ″ via a second airflow passage 424 ″. the outlet of the annular gap is oriented in the same direction as the direction of airflow entering the intake pipe ( ie , towards the cylinder side ). the space formed by the annular gap plays a role in guiding airflow to flow towards the cylinder . it should be noted that the gap may also be a gap other than the annular gap , as long as it is a segment of narrow space smaller than the second airflow passage . alternatively , a plurality of gaps which are not communicated with each other are formed around the inner wall of the first airflow passage . in other words , the gap may be a segment of small narrow space which connects the second air flow passage to the first air flow passage ( or an engine intake pipe ) of the electric supercharger . the airflow in the second airflow passage can flow out of the second airflow passage through the gap and enters the first airflow passage , and then enters the intake pipe and flows in the air flowing direction in the intake pipe . preferably , the cross section of the annular gap is circular or oval . preferably , the size w of the annular gap is 0 . 3 - 5 mm . preferably , the size of the gap is 1 - 4 mm . in one embodiment , the annular gap 4242 ″ is defined by a section of the annular inner wall of the first airflow passage and a section of annular wall 427 ′ which extends internally from one end of the boost pipe connected with the air filter side . an annular flow guiding plate 428 ″ is arranged at the inlet of the annular gap 4242 ″ and is used for guiding airflow to flow towards the outlet of the annular gap . it should be noted that , in the embodiment , the air outlet of the second airflow passage is an annular gap 4242 ″. however , one of ordinary person skilled in the art will understand that the air outlet of the second air flow passage can also be composed of one or more arc - shaped gaps or other shape gaps , as long as the shape of the air outlet is capable of enabling air flow ( air ) to be squeezed at the outlet , such that the air flow is accelerated to be blown out , and an combined air flow which has a same flow direction as the airflow direction in the original intake pipe is formed , and the air flow in the original intake pipe is driven to be accelerated to flow to the engine cylinder , so that boost can be realized . when the electric supercharger works , the inhaled air is guided to the air outlet of the electric supercharger through the second air flow passage after being supercharged by the electric supercharger . the annular gap ( annular notch ) of the air outlet enables the air to be squeezed at the outlet , so that air is blown out accelerated , and an combined air flow which has a same flow direction as the airflow direction in the original intake pipe is formed , and the air flow in the original intake pipe is driven to be accelerated to flow to the engine cylinder , so that boost can be realized , as shown in fig1 . when the electric supercharger stops working , due to the bernoulli effect , when the air in the intake pipe of the engine flows , a negative pressure area can be formed at the annular gap , so that air in the electric supercharger communicated with the outside air is inhaled into the intake pipe through the annular gap , and the amount of air entering the cylinder is increased . according to a preferred embodiment , the electric supercharger is further internally provided with a heating device 416 ″, wherein the heating device is used for heating air inhaled into the electric supercharger . preferably , the heating device is a heating wire or a ptc ceramic material . preferably , the heating device is electrically connected with the vehicle - mounted battery . preferably , the heating device is installed in the base and is located at front of the fan of the electric supercharger . air inhaled by the base passes through the fan blades firstly and then is heated by the heating device , and then enters the airflow pipe . in another embodiment , the heating device can be installed in the base and located at the air inlet , wherein the air inhaled by the base is heated through the heating device firstly and then enters the airflow pipe through the fan blades . according to present application , the heating energy and the heating time of the heating device are determined by the actual working condition of the engine , especially when the engine is in a low - temperature cold starting state , the heating air is inhaled into the cylinder , so that the cold starting emission of the engine can be effectively improved , and the starting period is shortened . fig1 is a diagram of an intake system of engine with an auxiliary intake assembly according to a second embodiment of the present invention . the main difference between present embodiment and the embodiment shown in fig2 is that the application of the auxiliary intake assembly 4 , 4 ′ and 4 ″. in the embodiment , the auxiliary intake assembly 4 , 4 ′ and 4 ″ are applied to the naturally - aspirated engine ( na engine ). in the above embodiment , the auxiliary intake assemblies 4 , 4 ′ and 4 ″ are applied to a turbocharged engine with a turbocharger . in present embodiment , the auxiliary intake assembly 4 , the structure of the 4 ′ and the 4 ″ is the same as the structure of the previous embodiment , and the structure is not described in detail herein . in the embodiment , the auxiliary intake assembly 4 , 4 ′ and 4 ″ are installed on a intake pipe 8 located on front of the electronic throttle 5 . herein , the term “ the front ”, “ the rear ”, “ front en ” and “ rear end ” refer to upstream or downstream position according to the air inlet flow direction of the engine . the definition of the front of the electronic throttle 5 should not be limited to the position at the downstream of the air filter in fig2 , and also comprises an auxiliary intake assembly 4 , 4 ′ and 4 ″ which are arranged at upstream of the air filter 1 , which also fall into the scope of the present application . during operation , fresh air enters the intake pipe 8 through air filtration , and then enters the auxiliary intake assemblies 4 , 4 ′ and 4 ″. meanwhile , the second fresh air is inhaled by the air inlets 50 a of the auxiliary air inlet assemblies 4 , 4 ′ and 4 ″ and is pressurized by the auxiliary intake assembly , and then passes through an air flow meter ( the air flow meter is used as an option and can be cancelled ), and then enters the engine intake manifold main pipe 6 through the electronic throttle 5 , and then enters the cylinder 10 after being distributed through the intake manifold 7 . the controller of the auxiliary intake assembly receives the air pressure , the engine rotating speed , the position of the electronic throttle and other engine state information , and controls the boost of the auxiliary intake assembly to form a closed - loop control on the target pressure of the boost . fig1 is a diagram of an intake system of engine with an auxiliary intake assembly according to a third embodiment of the present invention . the main difference between present embodiment and the embodiment shown in fig2 is that the position of the auxiliary intake assembly 4 , 4 ′ and 4 ″. in the embodiment , the auxiliary intake assembly 4 , 4 ′ and 4 ″ are arranged on the intake pipe 8 at upstream of the turbocharger 2 , and the rest is the same , which are not described in detail herein . during operation , fresh air enters the intake pipe 8 through the air filter 1 , and then enters the auxiliary air inlet assemblies 4 , 4 ′ and 4 ″. meanwhile , the second fresh air is inhaled by the air inlets 50 a of the auxiliary air inlet assemblies 4 , 4 ′ and 4 ″. then , the air pressurized by the auxiliary intake assembly 4 enters the air compressor end 2 a of the turbocharger 2 . after pressurized by the turbocharger , the high - temperature high - pressure air is cooled through the intercooler 3 . then , the air passes the electronic throttle 5 , and then enters the intake manifold main pipe 6 and then enters the cylinder 10 . the controller of the auxiliary intake assembly 4 , 4 ′ and 4 ″ receives the air inlet pressure , the pressurized air pressure , the engine rotating speed , the position of the electronic throttle and other engine state information , and controls the boost of the auxiliary intake assembly to form a closed - loop control on the target pressure of the boost . fig1 is an diagram of intake system of engine provided with the auxiliary intake assembly , the liquid adding system and the second throttle according to a fourth embodiment of the present invention . the intake system of engine of present embodiment is formed by combining the intake system of engine shown in fig9 and the auxiliary intake assembly as shown in fig9 , which are not described in detail herein . the function of the second throttle is to prevent the air flow entering the main pipe through the auxiliary intake assembly from flowing back to the air inlet end of the upstream turbocharger through adjust the opening degree of the valve of the second throttle , so that the pressurized air provided by the auxiliary intake assembly effectively enters the cylinder , and the effect of rapid boost is achieved . fig1 is a system diagram of an intake system of engine according to a fifth embodiment of the present invention , wherein the auxiliary intake assembly and the turbocharger share one common air inlet . during operation , fresh air flows through the air filter 1 and the air flow meter 13 , enters the intake pipe 8 and then enters the auxiliary intake assembly 4 and the air compressor end 2 a of the turbocharger 2 . then , after the air entering the air compressor end 2 a of the turbocharger 2 is pressurized by the turbocharger , the high - temperature high - pressure air is cooled through the intercooler 3 and is mixed with the air pressurized by the auxiliary intake assembly 4 , 4 ′ and 4 ″. then , the air passes the electronic throttle 5 , and then enters the intake manifold main pipe 6 and then enters the cylinder 10 . the controller of the auxiliary intake assembly 4 , 4 ′ and 4 ″ receives the air inlet pressure , the pressurized air pressure , the engine rotating speed , the position of the electronic throttle and other engine state information , and controls the boost of the auxiliary intake assembly to form a closed - loop control on the target pressure of the boost . according to a preferred embodiment , the auxiliary intake assembly is further internally provided with a heating device , wherein the heating device is used for heating air inhaled into the auxiliary intake assembly . preferably , the heating device is a heating wire or a ptc ceramic material . preferably , the heating device is electrically connected with the vehicle - mounted battery . preferably , the heating device is arranged in an air inlet passage of the auxiliary intake assembly . the air inhaled by the air inlet passage is heated through the heating device and enters the air flow pipe . according to present application , the heating energy and the heating time of the heating device are determined according to the actual working condition of the engine , especially when the engine is in a low - temperature cold starting state . the heating air is inhaled into the cylinder , so that the cold starting emission of the engine can be effectively improved , and the starting time is shortened . in table 1 , the technical effects achieved by arranging the auxiliary intake assembly at different positions are compared , and practicability evaluation is carried out . as can be seen from the above table , compared with an existing intake system of engine , whether the engine is a naturally - aspirated engine or a turbocharged engine , the intake system of engine of present invention has obvious improvement on power increasing , emission reduction , the cold start optimization , and the fuel consumption . in addition , different technical effects can be realized by arranging the auxiliary intake assembly at different places . 1 . the original intake system of the engine is slightly changed , and meanwhile , the amount of the air entered is improved efficiently . according to the invention , the supercharged air comes from environment outside the intake pipe , and the air inlet passage of the original pipe is not affected . therefore , the auxiliary intake assembly will not influence normal air inlet when the auxiliary intake assembly does not work . 2 . an independent air inlet is used when the auxiliary intake assembly is used to pressurize . additional air is inhaled into the auxiliary air inlet passage . an additional air chamber is added and the air is pressurized by it . the pressurized air is guided into the intake pipe through the auxiliary air outlet passage . meanwhile , the supercharged air drives the air in the intake pipe to accelerate flow when the pressurized air enters the intake pipe . the boost effect of the air flow of the original intake pipe is improved . the air inlet amount is obviously increased , and the boost effect is obvious . 3 . the auxiliary air outlet passage adopts an annular gap . air blown out after boost drives the air in the original intake pipe to move forwards , further achieving the effect of “ doubling ” the supercharged air . due to the accelerated flow of the air behind the annular air outlet , the air pressure of the air chamber of the auxiliary intake assembly close to the annular air outlet passage can be reduced , so that more air in the air filter side at the upstream of the auxiliary intake assembly can move towards the air outlet direction so as to balance the air pressure , such that the air inlet amount in the intake pipe is remarkably increased . the flow of the supercharged air flow is stable . 4 . the auxiliary air inlet passage is a incision with 0 . 3 - 3 mm wide and is positioned in edge of an airflow passage ( equivalent to a circular ring amplifier ). the air is blown out from the incision . there is no blade cutting the air , so that the supercharged air has no phased impact and fluctuation . therefore , the air flow is more stable than the air generated by a traditional electric turbine , and turbulence is not easily formed in the intake pipe , and therefore the surge of the engine is not caused . 5 . the heating device is additionally arranged in the auxiliary intake assembly , so that the low - temperature air is heated . when the temperature of the outside air is low , the heating device can be used for heating the inhaled air before the is blown out . the low - temperature starting effect of the engine and the stability after running are optimized . cold starting success rate at low temperature of an engine is improved , and combustion and emission at low temperature of an engine are optimized . 6 . convenient to be mounted , dismounted or cleaned . the auxiliary intake assembly only needs to be connected to an original intake pipe in series without redesigning the size of the original pipe . meanwhile , jet effect of high velocity airflow at the air outlet enable the fluid communication part of the auxiliary intake assembly is not easy to adsorb dust and oil stains , so that blockage is prevented , and it is free from cleaning and maintenance . 7 . atomized water is guided into the auxiliary intake assembly by arranging a fluid adding device . the air amount entered is increased . the temperature of the cylinder is reduced and thus the knocking is inhibited , the compression ratio is improved , the temperature of exhaust is lowered , and the fuel used to lower the temperature is omitted . therefore , the purpose of reducing the fuel consumption is achieved . the fuel consumption can be reduced by 15 % under a low - speed large - load area with the rotating speed of 2000 revolutions or less . the preferred embodiments of the present invention have been described in detail above . however , it should be understood that after reading the teachings of the present invention , a person skilled in the field can make various modifications or modifications to the invention . these equivalent forms are also within the scope defined by the appended claims .