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:
Mar. 25, 1997
Filed:
Apr. 05, 1996
Fumio Hara, Wako, JP;
Takashi Isobe, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An idling rotational speed control system for an internal combustion engine installed in a vehicle including an air-fuel ratio sensor arranged in the exhaust system, and an ECU which corrects the air-fuel ratio of an air-fuel mixture supplied to the engine in a feedback manner responsive to an output from the air-fuel ratio sensor, by using an air-fuel ratio correction amount calculated according to the output from the air-fuel ratio sensor. The rotational speed of the engine is detected, and the ECU controls the rotational speed of the engine during idling to a desired value in a feedback manner responsive to the detected rotational speed of the engine. The ECU determines whether the idling rotational speed control system is abnormal, based on the detected rotational speed of the engine and a control parameter used for the control of the rotational speed of the engine during idling. The idling rotational speed control system includes at least one of a brake system operation sensor for detecting operation of the brake system, and a throttle valve opening sensor for detecting opening of the throttle valve. When at least one of conditions is satisfied that the brake system is operated, the opening of the throttle valve exceeds a predetermined value, and the air-fuel ratio correction amount falls outside a predetermined range, the abnormality determination is inhibited.