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1.发明授权
公开(公告)号：US5387870A
公开(公告)日：1995-02-07
申请号：US2165
申请日：1993-01-08
摘要： The invention is a method and apparatus for extracting and analyzing features in real time from primary or secondary ignition waveforms, including engine probes, sampling device, and a processor that extracts from the waveform features such as peak firing height, firing line duration, firing line slope, firing line noise, post firing line duration, primary oscillations, and dwell interval duration and compares them against fixed thresholds and running averages to detect anomalies. Anomalies are reported as they occur allowing diagnosis of transient events as well as steady conditions. Waveforms with or without anomalies may be stored and retrieved as needed.
摘要翻译： 本发明是一种用于从主要或次要点火波形实时提取和分析特征的方法和装置，包括发动机探针，采样装置和从波形特征提取的处理器，例如峰值点火高度，点火线持续时间，点火线 斜坡，点火线噪声，点火线持续时间，主振荡和停留间隔持续时间，并将其与固定阈值和运行平均值进行比较，以检测异常。 报告异常情况，允许诊断瞬态事件以及稳定状态。 有或没有异常的波形可以根据需要进行存储和检索。
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公开(公告)号：US4418388A
公开(公告)日：1983-11-29
申请号：US178187
申请日：1980-08-14
CPC分类号： F02P17/10 , G01M15/05 , G01R31/007 , F02B1/04 , F02B2075/027
摘要： An apparatus which permits the automated diagnosis of automobile engine electrical system waveform patterns is disclosed. Employed in conjunction with an addressable random access memory which stores digitized information concerning the waveform are further means which logarithmically reduce input amplitude values of the waveform and coordinates sampling times for the waveform with engine RPM so that the memory capacity is fully utilized. Input conversion of the waveform is accomplished by a tracking analog-to-digital converter using comparator means which also provides a waveform peak detector. Upon an address command, the memory output is input into a read only memory which provides an anti-log conversion of the logarithmic value stored in the memory, thereby providing an output corresponding to an actual value signal.
摘要翻译： 公开了允许自动诊断汽车发动机电气系统波形图案的装置。 与存储关于波形的数字化信息的可寻址随机存取存储器一起使用的是进一步的手段，其对数地减小波形的输入幅度值，并且利用发动机RPM来协调波形的采样时间，从而充分利用存储器容量。 通过使用比较器装置的跟踪模数转换器实现波形的输入转换，该装置还提供波形峰值检测器。 在地址命令中，存储器输出被输入到只读存储器中，其提供存储在存储器中的对数值的反对数转换，从而提供对应于实际值信号的输出。
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