The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 2000
Filed:
Apr. 09, 1997
Takashi Kimura, Kanagawa-ken, JP;
Junsuke Ino, Tokyo, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
Accompanied by turning on power, power ON reset pulse from a power ON reset generation circuit is input to CPU and a fail determining circuit. After receiving the power ON reset pulse, the fail determining circuit intentionally outputs a fail detection signal. The CPU intentionally stops output of PRUN signal after confirming that fail detection signal. WDT confirms that output of the PRUN signal from the CPU is stopped in a predetermined time interval T and outputs PRUN abnormality signal. A reset pulse generation circuit confirms that PRUN abnormality signal is supplied from the WDT and outputs a reset pulse. A fail determining circuit receives a reset pulse and stops output of fail detection signal. When the fail determining circuit stops output of the fail detection signal, the CPU determines that the WDT, the reset pulse generation circuit and the fail determining circuit are in normal state. Thus, this monitoring system for electronic control unit is capable of diagnosing the WDT, the reset pulse generation circuit and the fail determining circuit at the time of self-diagnosis.