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:
Aug. 12, 2008
Filed:
Aug. 29, 2007
Toshikazu Tanaka, Kariya, JP;
Masaomi Inoue, Kariya, JP;
Yuuichi Takemura, Anjo, JP;
Zenichiro Mashiki, Nissin, JP;
Toshikazu Tanaka, Kariya, JP;
Masaomi Inoue, Kariya, JP;
Yuuichi Takemura, Anjo, JP;
Zenichiro Mashiki, Nissin, JP;
Denso Corporation, , JP;
Abstract
A motor current is estimated based on a target motor speed, an actual motor speed, and an engine speed. When the estimated motor current exceeds a predetermined value equivalent to a heat limiting current value, a variation (motor speed F/B amount) of the target motor speed outputted to an EDU from an ECU is restricted so that the motor current was restricted and heat generation in motor is restricted. In consideration of a deterioration of responsivity of the variable valve timing control due to restriction of the motor current during execution of motor current restriction processing, an existence of the abnormalities of variable valve timing controller is determined based on a deviation of the target camshaft phase and the actual camshaft phase.