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:
Nov. 22, 2016
Filed:
Mar. 03, 2015
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Tatsuya Takahata, Hiroshima, JP;
Keiichi Miyamoto, Higashihiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A control system for an engine is provided. The system includes a hydraulically-operated variable valve timing mechanism, a variable oil pump, and a hydraulic-pressure control valve. The variable valve timing mechanism has advance-side and retard-side operation chambers and a locking mechanism. The system includes a hydraulic-pressure sensor for detecting hydraulic pressure within a hydraulic-pressure path, and a pump control device for performing a target hydraulic-pressure control. During a change of an engine operating state in a specific operation of the engine, while an unlocking operation of a locking member of the locking mechanism is performed, the pump control device performs, instead of the target hydraulic-pressure control, a discharge amount restricting control to control the hydraulic pressure to be an upper-limit hydraulic-pressure value or lower, which is an upper limit to perform the unlocking operation.