METHOD AND SYSTEM FOR ADJUSTING A FUEL TANK ISOLATION VALVE
    3.
    发明申请
    METHOD AND SYSTEM FOR ADJUSTING A FUEL TANK ISOLATION VALVE 有权
    一种用于调节燃油罐隔离阀的方法和系统

    公开(公告)号:US20150122229A1

    公开(公告)日:2015-05-07

    申请号:US14496707

    申请日:2014-09-25

    IPC分类号: F02D41/00 F16K37/00 F02M25/08

    摘要: Methods and systems are provided for adjusting and diagnosing a position of a fuel tank isolation valve (FTIV) of a fuel system. In one example, a method comprises adjusting a FTIV of a fuel system by sending an electrical pulse to the FTIV; and comparing a current draw of the FTIV to a known current draw profile to verify the position of the FTIV. In this way, the position of the FTIV may be diagnosed, thereby resulting in increased accuracy of subsequent valve control.

    摘要翻译: 提供了用于调整和诊断燃料系统的燃料箱隔离阀(FTIV)的位置的方法和系统。 在一个示例中,一种方法包括通过向FTIV发送电脉冲来调节燃料系统的FTIV; 并将FTIV的当前平均值与已知的当前绘制曲线进行比较,以验证FTIV的位置。 以这种方式,可以诊断FTIV的位置,从而导致随后的阀控制的精度提高。

    FUEL SYSTEM DIAGNOSTICS
    6.
    发明申请
    FUEL SYSTEM DIAGNOSTICS 有权
    燃油系统诊断

    公开(公告)号:US20160290286A1

    公开(公告)日:2016-10-06

    申请号:US14672809

    申请日:2015-03-30

    IPC分类号: F02M25/08

    摘要: Methods and systems are provided for detecting a fuel tank oil-canning event during conditions when a vacuum is applied to the fuel tank, such as during a fuel system leak test or during purging of a fuel system canister. In one example, a method may include comparing the fuel tank pressure changes during a leak test to changes in fuel tank temperature or fill level and indicating fuel tank oil-canning in response to a higher than threshold rise in fuel tank pressure during or following application of vacuum to the fuel tank while each of a fuel temperature and fill level remain unchanged. By detecting fuel tank oil-canning accurately, appropriate countermeasures can be taken.

    摘要翻译: 提供了用于在燃料箱泄漏测试期间或在燃料系统罐的清洗过程中在向燃料箱施加真空的情况下检测燃料箱油罐装事件的方法和系统。 在一个示例中,一种方法可以包括将泄漏测试期间的燃料箱压力变化与燃料箱温度或填充水平的变化进行比较,并且响应于施加期间或之后的燃料箱压力高于阈值上升而指示燃料箱油罐装 的燃料箱中的每个燃料温度和填充水平保持不变。 通过准确检测油箱油罐,可以采取适当的对策。