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    • 5. 发明授权
    • Large leak diagnostic tool for a sealed fuel system in a vehicle
    • 用于车辆密封燃料系统的大型泄漏诊断工具
    • US08397552B2
    • 2013-03-19
    • US12895907
    • 2010-10-01
    • Robert JacksonWilliam R. CadmanJohn F. Van Gilder
    • Robert JacksonWilliam R. CadmanJohn F. Van Gilder
    • G01M3/34G01M3/04
    • G01M3/34B60K15/03519B60K2015/0319B60K2015/03514G01M3/025
    • A vehicle includes a sealed fuel system and a controller. The fuel system includes a fuel tank, a fuel cap, a control orifice, and an absolute pressure sensor. The controller associates a threshold large leak in the fuel system with a fuel cap sealing error. The controller detects completion of a prior refueling event, compares measurements from the pressure sensor to a reference vacuum across the control orifice to determine the presence of the threshold large leak, and sets a diagnostic code corresponding to the large leak only upon completion of the prior refueling event. A method for detecting the large leak includes detecting completion of the refueling event, comparing vacuum measurements from the absolute pressure sensor to a reference vacuum across the orifice to determine the presence of the large leak, and setting a diagnostic code corresponding to the large leak only upon completion of the prior refueling event.
    • 车辆包括密封燃料系统和控制器。 燃料系统包括燃料箱,燃料盖,控制孔和绝对压力传感器。 控制器将燃料系统中的阈值大泄漏与燃料盖密封误差相关联。 控制器检测先前的加油事件的完成,将来自压力传感器的测量值与控制孔口上的参考真空度进行比较,以确定阈值大泄漏的存在,并且仅在先前完成的情况下设置对应于大泄漏的诊断代码 加油事件 用于检测大泄漏的方法包括检测加油事件的完成,将来自绝对压力传感器的真空测量与穿过孔的参考真空进行比较,以确定是否存在大泄漏,并且设置对应于大泄漏的诊断代码 完成以前的加油事件。
    • 9. 发明申请
    • SYSTEM AND METHOD FOR DIAGNOSING FAULTS IN VACUUM PUMPS OF FUEL SYSTEMS AND FOR DIAGNOSING LEAKS IN FUEL SYSTEMS
    • 用于诊断燃油系统真空泵中的故障和用于诊断燃油系统中的泄漏的系统和方法
    • US20120097252A1
    • 2012-04-26
    • US12952522
    • 2010-11-23
    • Kurt D. Mc LainWilliam R. Cadman
    • Kurt D. Mc LainWilliam R. Cadman
    • F16K21/04
    • F02M25/0809F02D41/0032F02D2041/225Y10T137/0318Y10T137/7837
    • A control system includes a switching valve control module, a pressure determination module, and a fuel system diagnostic module. The switching valve control module actuates a switching valve in a fuel system of a vehicle between a first position and a second position, the first position venting a suction side of a vacuum pump in the fuel system to an atmosphere, the second position sealing the suction side of the vacuum pump from the atmosphere. The pressure determination module determines a first pressure on the suction side of the vacuum pump when the switching valve is in the first position, and determines a second pressure on the suction side of the vacuum pump when the switching valve is in the second position. The fuel system diagnostic module selectively diagnoses a fault in the vacuum pump based on the first pressure and the second pressure.
    • 控制系统包括切换阀控制模块,压力确定模块和燃料系统诊断模块。 切换阀控制模块致动在第一位置和第二位置之间的车辆的燃料系统中的切换阀,第一位置将燃料系统中的真空泵的吸入侧排出到大气中,第二位置将吸入 一侧的真空泵从大气层。 当切换阀处于第一位置时,压力确定模块确定真空泵的吸入侧上的第一压力,并且当切换阀处于第二位置时确定真空泵的吸入侧上的第二压力。 燃料系统诊断模块基于第一压力和第二压力选择性地诊断真空泵中的故障。