Electromechanical valve timing during a start

摘要

A method is described for starting an internal combustion engine. During a run-up in engine speed of the engine starting, the method includes adjusting intake valve closing timing in response to barometric pressure to provide a desired air amount in the cylinder, with a longer valve opening with respect to crankshaft angle at higher altitudes as compared to a shorter valve opening with respect to crankshaft angle at lower altitudes for a given operating constraint.