What does the fuel delivery system do when cruising down a steep hill and the rpms are steady at...
10-02-2006, 10:50 PM
#22
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there is still "load" on the engine (alternator, etc) ...
... so there needs to be enough mechanical energy coming from the drive train to prevent the ECU from deciding requested load is >0.
if the rpms fall low enough, the ECU will decide to open the throttle and add gas to keep the car from stalling.. see also "idle torque"
if the driver is totally off throttle, the ecu will actually eventually allow the car to stall, since req. torque is too low.
if the rpms fall low enough, the ECU will decide to open the throttle and add gas to keep the car from stalling.. see also "idle torque"
if the driver is totally off throttle, the ecu will actually eventually allow the car to stall, since req. torque is too low.
10-02-2006, 11:16 PM
#27
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yes the otto engine is an airpump. It becomes self sustaining when you introduce and combust fuel
when coasting with the clutch out the wheels are turning the engine via the diffs and transmission. Break that connection by clutching and the rpms will instantly fall until the RPM Sensors read 1200rpm and the idle program will engage.
