发明授权
US06148055A Counter and a revolution stop detection apparatus using the counter
失效
计数器和使用计数器的转速停止检测装置
- 专利标题: Counter and a revolution stop detection apparatus using the counter
- 专利标题(中): 计数器和使用计数器的转速停止检测装置
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申请号: US860197申请日: 1997-06-19
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公开(公告)号: US06148055A公开(公告)日: 2000-11-14
- 发明人: Masayoshi Sakai , Koichi Futsuhara
- 申请人: Masayoshi Sakai , Koichi Futsuhara
- 申请人地址: JPX Toyko
- 专利权人: The Nippon Signal Co., Ltd.
- 当前专利权人: The Nippon Signal Co., Ltd.
- 当前专利权人地址: JPX Toyko
- 优先权: JPX7-263142 19951011
- 主分类号: G01D3/08
- IPC分类号: G01D3/08 ; G01D5/244 ; G01P3/489 ; G01P13/00 ; G01P21/00 ; G01P21/02 ; G01R31/3185 ; G06M3/00
摘要:
A counting apparatus having excellent fail-safe characteristics can be used in a rotation-stopped detection apparatus. As a first feature, timing of a high-frequency signal P.sub.2 is carried out by a counter 1 after completion of a counting of pulse signals P.sub.1. When the frequency of the timing output for the high-frequency signal is a predetermined value, a judgment signal, indicating that the counting is normal, is generated by a frequency discriminating circuit 30. As a second feature, a counter 100 is preset using a preset signal. Then, after verifying by an output from a self hold circuit 102 that the counter 100 has been reset, a counting output is generated from a self hold circuit 104. As a third feature, the counting apparatus is used as timer circuits 203, 300, 400, and the generation frequency of a rotation detection pulse signal I.sub.P based on a sensor signal, is obtained to thereby detect a rotation-stopped condition of a rotating body.
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