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    • 5. 发明申请
    • Procedure to diagnose a leak in the fuel tank in a fuel tank ventilation system
    • 在燃油箱通风系统中诊断燃油箱泄漏的程序
    • US20080034843A1
    • 2008-02-14
    • US11880538
    • 2007-07-23
    • Martin StreibKarl-Bernhard LederleMichael Pfeil
    • Martin StreibKarl-Bernhard LederleMichael Pfeil
    • G01M3/04
    • G01M3/3263
    • A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulator and the fuel tank ventilation valve are connected by way of a system of lines and wherein the accumulator has an aeration line with a check valve, the method comprising: immediately before turning off the internal combustion engine, closing the check valve and opening the fuel tank ventilation valve to generate a vacuum in the fuel tank ventilation system; acquiring a vacuum degradation at specifiable points in time when the fuel tank ventilation valve is closed; opening of the check valve in order to bring about a pressure equilibrium with the ambient pressure; renewed closing of the check valve; acquiring a pressure increase emerging over at least a specifiable time interval and determination of a compensation variable; and inference about the presence of a leakage from behavior of the vacuum degradation over time, while taking into account behavior of the compensation variable over time.
    • 一种在燃料箱通风系统中诊断燃料箱泄漏的方法,包括燃料箱,用于燃料蒸汽的蓄能器和通向内燃机的进气歧管的燃料箱通风阀,其中燃料箱,蓄能器 并且所述燃料箱通风阀通过管线系统连接,并且其中所述蓄能器具有带止回阀的通气管,所述方法包括:在关闭所述内燃机之前,关闭所述止回阀并打开所述燃料箱 通风阀在燃油箱通风系统中产生真空; 在燃料箱通风阀关闭的可指定时间点获得真空退化; 打开止回阀以实现与环境压力的压力平衡; 更换关闭止回阀; 在至少可指定的时间间隔内获得压力增加并确定补偿变量; 并且在考虑到随时间推移的补偿变量的行为时,推断出随着时间的推移存在真空退化行为的泄漏。
    • 6. 发明申请
    • Procedure to diagnose a fuel tank ventilation system and device to implement the procedure
    • 诊断燃油箱通风系统的程序和实施程序的装置
    • US20070239330A1
    • 2007-10-11
    • US11731515
    • 2007-03-30
    • Andreas BaumannMartin StreibAndreas Pape
    • Andreas BaumannMartin StreibAndreas Pape
    • G01M17/00
    • F02M25/0818F02M25/0827F02M25/0836F02M25/089
    • A procedure to diagnose a fuel tank ventilation system of a motor vehicle and a device to implement the procedure are proposed. The fuel tank ventilation system contains at least one first ventilation pathway discharging into the air intake area of the internal combustion engine downstream behind a supercharger as well as at least one second ventilation pathway discharging into the air intake area upstream in front of the supercharger. Provision is made for a diagnosis with at least two partial diagnoses, whereby the first partial diagnosis pertaining to the first ventilation pathway is implemented, if the intake manifold pressure in the discharge area of the first ventilation pathway is smaller than the fuel tank system pressure; and the second partial diagnosis pertaining to the second ventilation pathway is implemented, if the intake manifold pressure in the discharge area of the first ventilation pathway is greater than the fuel tank system pressure. An error signal is provided, if at least one of the partial diagnoses generates a partial error signal.
    • 提出了一种诊断机动车辆燃油箱通风系统和实施程序的装置。 燃料箱通风系统包括至少一个第一通风路径,其排出到增压器下游的内燃机的进气区域中,以及至少一个第二通风路径,其排出到增压器前面的上游的进气区域。 如果第一通风路径的排放区域中的进气歧管压力小于燃料箱系统压力,则进行具有至少两个部分诊断的诊断,由此执行与第一通气路径有关的第一部分诊断; 并且如果第一通风路径的排放区域中的进气歧管压力大于燃料箱系统压力,则实施与第二通气路径有关的第二部分诊断。 如果部分诊断中的至少一个产生部分误差信号,则提供错误信号。