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:
Dec. 22, 1992
Filed:
Nov. 13, 1991
Toshiki Kuroda, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An idle running control apparatus for an internal combustion engine includes sensors for sensing the rotational speed or angular velocity of the engine, the opening degree of a throttle valve and the flow rate of intake air sucked into the engine, respectively. A misfiring determiner determines an occurrence of misfiring in the engine when a change in magnitude of the engine rotational speed exceeds a predetermined value. An idle speed adjuster adjusts the flow rate of intake air bypassing the throttle valve during idling so as to properly adjust the idle running speed of the engine. A controller is responsive to the outputs of the detectors and the misfiring determiner for controlling the idle running speed adjuster through feedback control with a control gain previously set such that a desired engine rotational speed is thereby attained. Upon occurrence of misfiring, in one aspect of the invention, the controller decreases the control gain so that the idle speed adjuster is thereby controlled to increase the idle running speed. In another aspect, the controller sets the desired rotational speed to a higher or greater value. Thus, hunting and an engine stall during the idle running operation of the engine can be prevented.