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    • 2. 发明授权
    • Vacuum decay testing method
    • 真空衰减试验方法
    • US08327691B2
    • 2012-12-11
    • US12552874
    • 2009-09-02
    • Robin J. DraneNick Wright
    • Robin J. DraneNick Wright
    • G01M3/04
    • F02M25/0818F02M25/089
    • A method and system are disclosed for determining whether a leak is present in an evaporative emission control system 10 for on-board diagnostic purposes. The method comprises predicting for a leak of predetermined size the time period required for the vacuum to fall from a predicted starting vacuum to a predetermined level of vacuum at which the state of a switch changes, checking at the end of the time period the state of the switch and using the state of the switch as an indication of whether a leak greater than the predetermined size is present in the evaporative emission control system.
    • 公开了一种用于确定用于车载诊断目的的蒸发排放控制系统10中是否存在泄漏的方法和系统。 该方法包括预测真空从预测的起始真空下降到开关状态变化的预定的真空水平所需的时间段的预定尺寸的泄漏,在时间段结束时检查 开关和使用开关的状态作为在蒸发排放控制系统中是否存在大于预定尺寸的泄漏的指示。
    • 4. 发明申请
    • VACUUM DECAY TESTING METHOD
    • 真空衰减测试方法
    • US20100064774A1
    • 2010-03-18
    • US12552874
    • 2009-09-02
    • Robin J. DraneNick Wright
    • Robin J. DraneNick Wright
    • G01M3/04
    • F02M25/0818F02M25/089
    • A method and system are disclosed for determining whether a leak is present in an evaporative emission control system 10 for on-board diagnostic purposes. The method comprises predicting for a leak of predetermined size the time period required for the vacuum to fall from a predicted starting vacuum to a predetermined level of vacuum at which the state of a switch changes, checking at the end of the time period the state of the switch and using the state of the switch as an indication of whether a leak greater than the predetermined size is present in the evaporative emission control system 10.
    • 公开了一种用于确定用于车载诊断目的的蒸发排放控制系统10中是否存在泄漏的方法和系统。 该方法包括预测真空从预测的起始真空下降到开关状态变化的预定的真空水平所需的时间段的预定尺寸的泄漏,在时间段结束时检查 开关和使用开关的状态作为在蒸发排放控制系统10中是否存在大于预定尺寸的泄漏的指示。