Multi-step valve lift failure mode detection
    5.
    发明授权
    Multi-step valve lift failure mode detection 有权
    多级阀提升故障模式检测

    公开(公告)号:US08428809B2

    公开(公告)日:2013-04-23

    申请号:US12028959

    申请日:2008-02-11

    摘要: 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.

    摘要翻译: 一种气门升降器故障检测方法可以包括确定具有进气门升降器的发动机中的第一和第二进气压力,该进气门升降器在第一和第二提升模式中选择性地操作进气门。 当发动机被命令在第一提升模式下操作时,第一进气压力可以对应于发动机的第一活塞的进气冲程,并且第二进气压力可以对应于发动机的第二活塞的进气冲程, 发动机被命令在第一升降模式下操作。 该方法还可以包括当差值超过预定极限时确定第一和第二进气压力之间的差异并诊断进气门升降器故障。

    DIAGNOSTIC SYSTEMS AND METHODS FOR VARIABLE LIFT MECHANISMS OF ENGINE SYSTEMS HAVING A CAMSHAFT DRIVEN FUEL PUMP
    7.
    发明申请
    DIAGNOSTIC SYSTEMS AND METHODS FOR VARIABLE LIFT MECHANISMS OF ENGINE SYSTEMS HAVING A CAMSHAFT DRIVEN FUEL PUMP 有权
    具有CAMSHAFT驱动燃油泵的发动机系统的变动提升机构的诊断系统和方法

    公开(公告)号:US20100269575A1

    公开(公告)日:2010-10-28

    申请号:US12429769

    申请日:2009-04-24

    IPC分类号: G01M15/08 G01M15/04

    摘要: A lift mechanism diagnostic system comprises a fuel pump disabling module, a pressure module, and a diagnostic module. The fuel pump disabling module selectively disables a fuel pump that is driven by a camshaft. The pressure module determines a first pressure of fluid provided to a variable valve lift mechanism when the variable valve lift mechanism is operated in a first lift mode while the fuel pump is disabled and determines a second pressure of the fluid when the variable valve lift mechanism is operated in a second lift mode while the fuel pump is disabled. The diagnostic module selectively diagnoses a fault in the variable valve lift mechanism based on the first and second pressures.

    摘要翻译: 升降机构诊断系统包括燃料泵禁用模块,压力模块和诊断模块。 燃油泵停用模块选择性地禁用由凸轮轴驱动的燃油泵。 当可变气门提升机构在第一提升模式下操作而燃料泵被禁用时,压力模块确定提供给可变气门提升机构的流体的第一压力,并且当可变气门升程机构是可变气门升程机构时,确定流体的第二压力 在燃油泵停用时,以第二提升模式运行。 诊断模块基于第一和第二压力选择性地诊断可变气门提升机构中的故障。