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公开(公告)号：US5387253A
公开(公告)日：1995-02-07
申请号：US997431
申请日：1992-12-28
CPC分类号： G01M15/11
摘要： A system, and corresponding method, for detecting the presence of a misfire condition by interpreting spectral activity of a running engine includes a device (309, 313) for measuring a characteristic, preferably an acceleration characteristic indicative of the running engine's performance, A spectral discrimination device (319), preferably a digital filter, receives a composite signal (317) provided by the measuring device (309, 313). The digital filter (319) provides a normal firing signal (321), corresponding to spectral energy attributable to a portion of the composite signal (317) representative of a normal firing condition in the running engine, and a misfire signal (323), corresponding to spectral energy attributable to another portion of the composite signal (317) representative of a misfiring condition in the running engine. A comparison device (325) provides and indication of a misfire condition (327) when a magnitude of the misfire signal (323) exceeds a magnitude of the normal firing signal (321).
摘要翻译： 用于通过解释运行发动机的频谱活动来检测失火状况的存在的系统和相应的方法包括用于测量特性的装置（309,313），优选地是表示运行的发动机性能的加速度特性。A光谱辨别 设备（319），优选数字滤波器，接收由测量设备（309,313）提供的复合信号（317）。 数字滤波器（319）提供正常点火信号（321），其对应于代表运行发动机中正常点火条件的复合信号（317）的一部分的光谱能量，以及失火信号（323），对应于 归因于代表运行发动机中的失火状态的复合信号（317）的另一部分的光谱能量。 当失火信号（323）的大小超过正常点火信号（321）的大小时，比较装置（325）提供和指示失火状态（327）。
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2.发明授权
公开(公告)号：US5915272A
公开(公告)日：1999-06-22
申请号：US100418
申请日：1993-08-02
CPC分类号： G01M15/046 , G01M15/09 , F02D2200/1015
摘要： A method of detecting low compression pressure by interpreting acceleration of an engine crankshaft (201) is detailed. In a preferred embodiment, the method teaches measurement of intake manifold pressure. Then, a first engine crankshaft acceleration is measured, preferably proximate a maximum rate of compression, for a cylinder (113), and a first variable (307) indicative of the first engine crankshaft acceleration is provided. Then, a second engine crankshaft acceleration is measured, preferably proximate the cylinder's top-dead-center position (105), and a second variable (311) indicative of the second engine crankshaft acceleration is provided. Then, the method combines (313) the intake manifold pressure, the first variable, and the second variable and provides a compression pressure variable as a function of the combined variables. Other embodiments include subsets of the above variables to provide a compression pressure variable as a function of the combined variables. In all of the embodiments, a low compression pressure may be indicated (317) when the compression pressure variable does not exceed a predetermined limit for the associated cylinder. An apparatus is also detailed in support of the preferred method.
摘要翻译： 详细说明通过解释发动机曲轴（201）的加速度来检测低压缩压力的方法。 在优选实施例中，该方法教导了进气歧管压力的测量。 然后，针对气缸（113）测量第一发动机曲轴加速度，优选接近最大压缩速率，并且提供表示第一发动机曲轴加速度的第一变量（307）。 然后，测量第二发动机曲轴加速度，优选地靠近气缸的上止点位置（105），并且提供表示第二发动机曲轴加速度的第二变量（311）。 然后，该方法结合（313）进气歧管压力，第一变量和第二变量，并提供作为组合变量的函数的压缩压力变量。 其他实施例包括上述变量的子集，以提供作为组合变量的函数的压缩压力变量。 在所有实施例中，当压缩压力变量不超过关联气缸的预定极限时，可以指示低压缩压力（317）。 还支持优选方法的装置也是详细的。
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3.发明授权
公开(公告)号：US5637788A
公开(公告)日：1997-06-10
申请号：US511331
申请日：1995-08-03
CPC分类号： F02M25/0809
摘要： A apparatus and method of detecting a leak in an evaporative emissions system measures vapor flow out of the evaporative emissions system while maintaining a zero pressure difference from inside a fuel tank to atmosphere and provides a reference vapor flow variable dependent on the measurement (317). A pressurized vapor and leak flow variable is measured (323) dependent on measured vapor flow out of the evaporative emissions system while maintaining a pressure difference of 10" of water from inside the fuel tank to atmosphere. A leak is indicated (327) if a difference between the reference vapor flow variable and the pressurized vapor and leak flow variable is greater than a predetermined leak flow factor.
摘要翻译： 检测蒸发排放系统中的泄漏的装置和方法测量蒸发排出系统中的蒸汽流，同时保持从燃料箱内部到大气的零压差，并提供取决于测量的参考蒸汽流变量（317）。 测量加压蒸汽和泄漏流量变量（323），取决于蒸发排放系统中测量的蒸汽流量，同时保持水从燃料箱内部到大气的压力差为10“。 如果参考蒸汽流量变量和加压蒸汽和泄漏流量变量之间的差异大于预定的泄漏流量因子，则指示泄漏（327）。
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