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1. 发明授权

US06640621B2 Diagnostic method for a shaft sensor in a reciprocating internal combustion engine 失效
公开(公告)号：US06640621B2
公开(公告)日：2003-11-04
申请号：US09983465
申请日：2001-03-29
申请人： James D. Ward , Alton L. Schuessler , Kenneth M. Simpson , Hallett D. Breidenbach
发明人： James D. Ward , Alton L. Schuessler , Kenneth M. Simpson , Hallett D. Breidenbach
IPC分类号： G01M1500
CPC分类号： G01L3/26
摘要： An improved method of diagnosing shaft sensor failure in a reciprocating internal combustion engine verifies engine rotation by sensor information responsive to dynamic variation in engine air intake that occurs during engine rotation. Failure of the shaft sensor is diagnosed when the dynamic variation in engine air intake is detected in the absence of a shaft sensor signal. The sensor information used to detect the dynamic variation in intake air may be obtained from either a mass air flow sensor disposed in a throttle passage of the engine, or from a pressure sensor disposed in an intake manifold of the engine, and virtually all current engine control systems utilize at least one of these sensors. The dynamic variation is detected by recognizing rising and falling segments of the signal waveform, by comparing the relative manifold pressure to predetermined maximum and minimum values, or by using a derivative of the signal waveform to recognize its inflection points.

2. 发明授权

US06390077B1 Adaptive flow restriction test method for an exhaust gas recirculation system 有权
标题翻译：排气再循环系统的自适应流量限制测试方法
公开(公告)号：US06390077B1
公开(公告)日：2002-05-21
申请号：US09816938
申请日：2000-09-13
申请人： Kenneth M. Simpson , Michael T. Cottrell , Stephen F. Majkowski , Hallett D. Breidenbach , Alton L. Schuessler
发明人： Kenneth M. Simpson , Michael T. Cottrell , Stephen F. Majkowski , Hallett D. Breidenbach , Alton L. Schuessler
IPC分类号： F02M2507
CPC分类号： F02M26/47 , F02D2200/0406 , F02M26/49
摘要： An improved test method for an EGR system reliably detects debilitating EGR system restrictions without significantly degrading combustion stability and exhaust emissions. The EGR valve test opening for diagnostic purposes is initialized at a relatively low value, which is progressively increased if the resulting change in intake manifold pressure fails to exceed a threshold based on the minimum expected change in intake manifold pressure for an EGR system that is regarded as functioning within acceptable limits. As soon as the measured pressure change exceeds the threshold, the EGR system is deemed to pass the restriction test, and the test method is terminated. If the EGR valve opening reaches a maximum value without the measured pressure exceeding the threshold, the EGR system is deemed to fail the restriction test, and a fault indication is generated. Consequently, the test opening of the EGR valve is adaptively determined based on the measured intake manifold pressure change, and is never larger than required to reliably detect a debilitating EGR restriction. This allows reliable detection of a borderline failing EGR system, while preventing degradation of combustion stability and emissions in a substantially unrestricted EGR system.
摘要翻译：用于EGR系统的改进的测试方法可以可靠地检测衰减的EGR系统限制，而不会显着降低燃烧稳定性和废气排放。用于诊断目的的EGR阀测试开口被初始化为相对较低的值，如果由于所考虑的EGR系统的进气歧管压力的最小预期变化导致的进气歧管压力的变化不能超过阈值，则其逐渐增加在可接受的范围内运作。一旦测量的压力变化超过阈值，则认为EGR系统通过限制测试，并且终止测试方法。如果EGR阀开度达到最大值而没有测量压力超过阈值，则认为EGR系统不能进行限制测试，并产生故障指示。因此，基于所测量的进气歧管压力变化自适应地确定EGR阀的测试开度，并且不大于可靠地检测衰减的EGR限制所要求的EGR阀的测试开度。这允许可靠地检测边界故障的EGR系统，同时防止在基本上无限制的EGR系统中的燃烧稳定性和排放的劣化。

3. 发明授权

US06564622B2 Method of determining soak-related time intervals of an internal combustion engine 失效
公开(公告)号：US06564622B2
公开(公告)日：2003-05-20
申请号：US09870427
申请日：2001-05-30
申请人： Stephen F. Majkowski , Alton L. Schuessler , David Allen Dues , Nicholas Colella , Myron Harold Bell
发明人： Stephen F. Majkowski , Alton L. Schuessler , David Allen Dues , Nicholas Colella , Myron Harold Bell
IPC分类号： G01M1500
CPC分类号： F02D41/065 , F02D41/042 , F02D2041/1411
摘要： An improved method of determining and preserving soak-related time intervals of an internal combustion engine resets a continuous timer at the end of each engine run period, and reads the value of the continuous timer at specified events during an ignition key cycle. The method measures and preserves the engine soak time preceding the current and previous ignition key cycle, and determines an extended soak time that includes intervals of engine operation that are too short to significantly affect the engine thermal and fuel vapor purge conditions. The determined soak-related times are then utilized by various engine control and/or diagnostic algorithms, such as a hot re-start fuel control algorithm.

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