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:
Feb. 26, 1991
Filed:
Aug. 01, 1990
Satoru Ohkubo, Amagasaki, JP;
Akira Demizu, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A valve timing control apparatus for an internal combustion engine capable of controlling the opening and closing timing of the intake and exhaust valves with a high degree of preciseness, as well as improving the air-intake and exhaust-discharge efficiency of the engine for increased engine output power. To this end, the valve timing control apparatus includes a pressure sensor for sensing the internal pressure in an engine cylinder, a crank angle sensor for sensing the crank angle of the engine, a valve timing detector for detecting the opening and closing timings of the intake and exhaust valves from the sensed cylinder internal pressure and the sensed engine crank angle, a disabling element for disabling the operation of the valve timing detector during combustion periods of the engine, a valve timing storage element for storing basic valve opening and closing timings for the intake and exhaust valves which are predetermined based on the operating conditions of the engine, a comparison element for comparing the detected valve opening and closing timings as detected by the valve timing detector and the predetermined valve opening and closing timings stored in the valve timing storage element so as to calculate deviations therebetween, and a valve timing control element for controlling the opening and closing timings of the intake and exhaust valves in accordance with the deviations thus calculated in such a manner that the actual opening and closing of the intake and exhaust valves take place at the predetermined basic valve opening and closing timings.