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:
Mar. 30, 2010
Filed:
Feb. 28, 2007
Zenichiro Mashiki, Nisshin, JP;
Yasumichi Inoue, Toyota, JP;
Noboru Takagi, Toyota, JP;
Yoshihito Moriya, Nagoya, JP;
Haruyuki Urushihata, Chiryu, JP;
Zenichiro Mashiki, Nisshin, JP;
Yasumichi Inoue, Toyota, JP;
Noboru Takagi, Toyota, JP;
Yoshihito Moriya, Nagoya, JP;
Haruyuki Urushihata, Chiryu, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Denso Corporation, Aichi-ken, JP;
Abstract
When the engine speed is high (determination of YES at S), actual intake valve phase is calculated based on rotation phase difference between rotation angles of crankshaft and camshaft, detected by using a crank angle signal and a cam angle signal, and actual valve timing is detected therefrom. When the engine speed is low (determination of NO at S) and the crank angle signal and cam angle signal are unstable, an amount of change in camshaft rotation phase by the VVT mechanism in accordance with the operation amount of actuator detected by a motor rotation angle signal is calculated successively, and based on an accumulation of the amount of change, the actual intake valve phase is calculated, and the actual valve timing is detected.