发明名称 |
LOAD FAILURE DIAGNOSIS METHOD AND APPARATUS AND LOAD FAILURE PROCESSING METHOD AND APPARATUS |
摘要 |
Presence/absence of failure of a PWM-driven load can easily be judged according to the state of pulse voltage applied to the load. A failure diagnosis apparatus (10) judges failure of an electromagnetic valve (2) pulse-width modulation driven by a drive circuit (4) in response to a control pulse signal (P1). A voltage signal (VA) generated by a pulse width modulation drive is input to a smoothing circuit (11) at a connection point (A) between the electromagnetic valve (2) and the drive circuit (4) so as to obtain a smoothing output voltage (VB). It is determined whether the level value of the smoothing output voltage (VB) is a predetermined value determined by the duty ratio of the control pulse signal (P1) which is a duty ratio set for pulse width modulation drive, thereby judging presence/absence of failure of the electromagnetic valve (2).
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申请公布号 |
WO03067349(A1) |
申请公布日期 |
2003.08.14 |
申请号 |
WO2003JP00719 |
申请日期 |
2003.01.27 |
申请人 |
BOSCH AUTOMOTIVE SYSTEMS CORPORATION |
发明人 |
MATSUZAKI, HIDEAKI;WATANABE, YASUMASA;SATO, EIICHI;KAWANO, TOMOYUKI;KURIHARA, TOMOHIRO |
分类号 |
G05B9/02;G05B11/28;G05B23/02;(IPC1-7):G05B23/02 |
主分类号 |
G05B9/02 |
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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