The controller consults the map to determine the new engine speed corresponding to the new power demand and operates {HEAD ~ the throttle} to cause {TAIL ~ the engine} to run at the new speed 
The controller consults the map to determine the new engine speed corresponding to the new power demand and operates { HEAD ~ the throttle } to cause { TAIL ~ the engine } to run at the new speed
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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH