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:
Jul. 31, 1984
Filed:
Mar. 15, 1983
Aisan Kogyo Kabushiki Kaisha, Obu, JP;
Abstract
An air-fuel ratio control circuit for an internal combustion engine comprising a low-pass filter, a hysteresis type comparator, and delay timer, wherein output signals from an exhaust gas sensor are transmitted through the low-pass filter to the hysteresis type comparator and then to the delay timer. A pulse motor for controlling an air-fuel ratio is driven at high speeds for a specified period of time determined by the delay timer in either forward or reverse direction which is determined by the output of the comparator at each time when the output of the comparator is inverted and is driven at low speeds after the specified period of time has elapsed, wherein the time constant of the low-pass filter is set longer than the delay time of the delay timer.