ENGINE CONTROL SYSTEM HAVING QUICK-OPEN VALVE TIMING

摘要

An engine control system having quick-open valve timing is disclosed. The engine may have a cylinder, a piston slidably disposed in the cylinder, and an exhaust valve configured to open and close an exhaust port. Operation of the engine may include directing air and fuel into the cylinder, and combusting the air and fuel to force the piston between a TDC position and a BDC position. Operation may further include cyclically opening and closing the exhaust valve during piston movement according to a first valve timing. Operation may also include receiving a signal indicative of a condition associated with pre-ignition of the air and fuel, and selectively opening and closing the exhaust valve according to a second valve timing, based at least on the signal. In the second valve timing, the exhaust valve may be moved from a closed position to a maximum lift position in a shorter amount of time than in the first valve timing.