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:
Jun. 04, 1996
Filed:
Feb. 03, 1995
Nippondenso Co., Ltd., Kariya, JP;
Abstract
To realize a highly reliable feedback control of the valve timing, i.e., angular rotational relation between a crankshaft and a camshaft, three reference signals are generated from the crankshaft side, and three cam signals corresponding to three pulse inductors arranged at even angles to the camshaft or arbitrary angle intervals to the camshaft are generated from the camshaft side. The variation in the phase difference of each cam signal to each reference angle signal caused by the installation position of the corresponding pulse inductors is stored in a memory as compensation values indicating differences from the phase difference used as a reference. When the signals are detected, the corresponding compensation value for the phase differences other than those used as reference is read out, added and compensated. Based on the relation of the compensated phase difference and a target value of the valve timing, the rotational phase of the crankshaft and the camshaft is controlled.