System and method for diagnosing output power of an internal combustion engine
    1.
    发明授权
    System and method for diagnosing output power of an internal combustion engine 失效
    用于诊断内燃机输出功率的系统和方法

    公开(公告)号:US06185996B1

    公开(公告)日:2001-02-13

    申请号:US08970821

    申请日:1997-11-14

    IPC分类号: G01M1500

    CPC分类号: G01M15/044

    摘要: A system and method for diagnosing output power of an internal combustion engine includes means for diagnosing potential causes of low engine output power or torque and means for estimating actual engine output power or torque. In a preferred embodiment of the diagnosis of engine output power, low engine output power is first investigated for authenticity to verify whether a low engine output power condition exists. If one exists, a zero fueling engine cranking test is conducted to determine whether relative compression values for each of the cylinders are within specification, and any problems associated therewith are corrected by service personnel. If the low engine output power problem is not corrected in accordance with the engine cranking test, a snap-throttle cylinder balancing test is conducted to balance the relative power contribution from each cylinder. If the cylinder balancing test does not correct the low engine output power problem, a road test is conducted to estimate the actual engine output power for comparison with a rated engine output power over a desired range of engine speeds.

    摘要翻译: 用于诊断内燃机的输出功率的系统和方法包括用于诊断低发动机输出功率或扭矩的潜在原因的装置以及用于估计实际发动机输出功率或扭矩的装置。 在发动机输出功率诊断的优选实施例中,首先调查低发动机输出功率的真实性,以验证是否存在低发动机输出功率状况。 如果存在,则进行零加油发动机起动试验,以确定每个气缸的相对压缩值是否在规定范围内,并且与其相关的任何问题由维修​​人员校正。 如果根据发动机起动试验不能校正低发动机输出功率问题,则进行快速节气门缸平衡试验以平衡来自每个气缸的相对功率贡献。 如果气缸平衡测试不能纠正低发动机输出功率问题,则进行道路测试以估计实际的发动机输出功率,以便在发动机转速的期望范围内与额定发动机输出功率进行比较。