SYSTEM AND METHOD FOR CONTROLING CRANKSHAFT POSITION DURING ENGINE SHUTDOWN USING CYLINDER PRESSURE

摘要

Systems and methods for controlling stopping position of a crankshaft during shutdown of a multiple cylinder internal combustion engine influence cylinder pressure independent of associated intake/exhaust valves during shutdown of the engine so the crankshaft stops in a position favorable for restarting. Embodiments include an engine having variable compression ratio cylinders with the compression ratio of the cylinders controlled to vary cylinder pressure during shutdown to control stopping position of the crankshaft, or an auxiliary control valve disposed in a cylinder wall to control pressure within the cylinders during shutdown so the crankshaft stops in a position desirable for restarting.