When the throttle valve is closed, the engine has a predefined drag torque MSM which is dependent on the engine speed and which is limited at low engine speeds to comply with the idling engine speed value by {HEAD ~ the idling regulator} to produce {TAIL ~ a minimum engine torque MM}  
to produce
When the throttle valve is closed , the engine has a predefined drag torque MSM which is dependent on the engine speed and which is limited at low engine speeds to comply with the idling engine speed value by { HEAD ~ the idling regulator } to produce { TAIL ~ a minimum engine torque MM }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH