Invention Grant
US08146567B2 Two-step valve lifter control systems and methods 有权
两级阀门升降机控制系统及方法

Two-step valve lifter control systems and methods
Abstract:
A valve lifter control system includes a valve lifter control module and a forced transition determination module. The valve lifter control module determines a desired lift state of a valve lifter based on at least one of engine speed and engine load. The forced transition determination module initiates a forced transition of the valve lifter from the low-lift state to the high-lift state based on manifold vacuum independently of the desired lift state.
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