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:
Apr. 07, 1998
Filed:
Jul. 10, 1996
Akihiko Kanamori, Okazaki, JP;
Shinji Kogure, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A fail check device and method for switching signal lines, wherein PWM signals are sent out onto PWM signal lines through a PWM signal output/survey circuit. Based on the level of the PWM signals to be sent out and the level of the PWM signals actually sent out, a PWM mismatch signal (logical) is produced. The produced PWM mismatch signal (logical) has a value which indicates a fault when the PWM signal lines are in a state of breakage or short circuit to a ground or the PWM signal lines in a predrive circuit are short-circuited to the positive wiring of a power source. Therefore, by using the PWM mismatch signal (logical), a breakage in the PWM signal lines or a fault in the predrive circuit can be detected by a control CPU.