Fuel injection timing control apparatus for a diesel engine, including a determination of when actual ignition can be detected

摘要

An apparatus for controlling the timing of fuel injection into a diesel engine, including means for computing a target time at which injection should occur and means for sensing when injection actually occurs, with respect to a reference crankshaft position, feedback control means for adjusting the actual injection time to bring this into coincidence with the target injection time, means for sensing when firing of fuel within an engine cylinder actually occurs and for computing a target firing time based on the current operating status of the engine. A compensation factor is computed based on the difference between the actual and target firing times, and is utilized to modify the actual fuel injection time such as to bring the actual and target firing times into coincidence. Means are included for judging whether the engine operating status will permit reliable firing time data to be acquired, and for selectively enabling and inhibiting computation of successive new values of compensation factor based on this judgement.