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:
May. 04, 1993
Filed:
Mar. 15, 1991
Hiroshi Shibata, Kariya, JP;
Takaaki Baba, Anjo, JP;
Kazunobu Morimoto, Aichi, JP;
Masao Ito, Nagoya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A control system with an abnormality detecting device for use in a motor vehicle. The control system comprises a microcomputer coupled through a switching circuit and an analog-to-digital converter to a sensor for sensing an operating state of the motor vehicle and also to a reference voltage generating circuit. The switching circuit performs a switching operation between an analog signal from the sensor and a predetermined reference voltage signal from the reference voltage generating circuit to supply the analog-to-digital converter with one of the analog signals which is analog-to-digital-converted in the analog-to-digital converter. The microcomputer has a first decision function which decides that the output signal of the analog-to-digital converter to be coupled to the sensor is out of a predetermined range, and further has a second decision function which decides that the output signal of the analog-to-digital converter to be coupled to the reference voltage generating circuit is different from a predetermined value. In accordance with the decision result, the second decision function decides that the sensor or analog-to-digital converter circuit is in an abnormal state. This arrangement can selectively and adequately detect the malfunction of the sensor or analog-to-digital converter.