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CN101509434A 多级阀升程故障模式检测 失效 - 权利终止

多级阀升程故障模式检测
摘要：
多级阀升程故障模式检测，可包括确定发动机中的第一和第二进气压力，其中发动机具有进气阀挺杆，其选择性地在第一和第二升程模式下操作进气阀。当发动机被指令工作于第一升程模式时，第一进气压力可对应于发动机的第一活塞的进气冲程，当发动机被指令工作于第一升程模式时，第二进气压力可对应于发动机的第二活塞的进气冲程。该方法还可以包括确定第一和第二进气压力之间的差值以及当差值超过预定限度时诊断进气阀挺杆故障。
摘要（英）：

A method of valve lift failure detection may include determining first and second intake air pressures in an engine having intake valve lifters that selectively operate intake valves in first and second lift modes. The first intake air pressure may correspond to an intake stroke of a first piston of the engine when the engine is commanded to operate in the first lift mode and the second intake air pressure may correspond to an intake stroke of a second piston of the engine when the engine is commanded to operate in the first lift mode. The method may further include determining a difference between the first and second intake air pressures and diagnosing an intake valve lifter failure when the difference exceeds a predetermined limit.

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