发明名称 |
Knock sensor system for detecting and responding to a disconnect condition |
摘要 |
Signals generated by a knock sensor are coupled to an electronic network for amplifying and processing the output signals of the knock sensor. The electronic network includes a device for charging a storage capacitor to a potential which is a function of the amplitude of the knock sensor output signal. The storage capacitor is coupled to the input of an amplifier via a normally closed first switch. A detector for sensing any disconnection of the knock sensor from the electronic system produces a control signal indicative of a disconnect condition. The control signal is used to open the normally closed first switch and to cause the input of the amplifier to be clamped to a reference potential which lies outside the signal range normally produced across the storage capacitor whereby the output of the output of the amplifier is placed at a predetermined level indicative of a disconnect condition. The amplifier thus produces signals at its output which are within a predetermined range during normal operation and a signal outside of this range in response to a knock sensor disconnect condition. Thus, a single line from the output amplifier carries regular normal signals and the disconnect signal lying outside the range of the normal signals.
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申请公布号 |
US5942677(A) |
申请公布日期 |
1999.08.24 |
申请号 |
US19970931340 |
申请日期 |
1997.09.16 |
申请人 |
HARRIS CORPORATION |
发明人 |
VULIH, SALOMON;GLICA, STEPHEN J.;WITTLINGER, HAROLD ALLEN |
分类号 |
G01L23/22;(IPC1-7):G01L23/22 |
主分类号 |
G01L23/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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