Method for estimating the crankshaft angle for a fifty percent combustion

摘要

An engine control method for a vehicle, comprising: a crankshaft angle (296) at which 50 percent of a mass of fuel is burned during a combustion event is estimated based on: a combustion speed (308) when a crankshaft of an engine (102) is during the combustion event is at a predetermined position; engine speed (324); air mass per cylinder (APC) (328); spark timing (340); anda predetermined spark timing (352); and an engine actuator (162, 164, 240) is controlled based on the crank angle (296) at which 50 percent of the mass of fuel is burned during the combustion event.