A system and method for determining an oil spill level of an engine based on a switching period of a valve lift actuator to improve engine starts

摘要

A system in accordance with the principles of the present disclosure includes a shift period module and at least one of a valve lift control module and a start-stop control module. The switching period module determines a switching period that elapses when a valve lift actuator of an engine shifts between a first valve lift position and a second valve lift position that is different from the first lift position. The switching period begins when a measured position of the valve lift actuator corresponds to the first lift position, and the shift period ends when the measured position of the valve lift actuator corresponds to the second lift position. The valve lift control module controls the valve lift actuator based on the shift period. The start-stop control module determines whether the engine is automatically stopped based on the shift period.