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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.:

US 10240539 B1

PDFFull Text
Date of Patent:
Mar. 26, 2019

Filed:

Aug. 14, 2017

Hydraulic control system for engine

Applicant:

Mazda Motor Corporation, Hiroshima, JP;

Inventors:

Toshiaki Nishimoto, Hiroshima, JP;

Masanori Hashimoto, Hiroshima, JP;

Assignee:

MAZDA MOTOR CORPORATION, Hiroshima, JP;

Attorney:

Studebaker & Brackett PC

Primary Examiner:

Mark A Laurenzi

Assistant Examiner:

Wesley G Harris

Int. Cl.
CPC ...
F02D 13/06 (2006.01); F01L 1/34 (2006.01); F01L 1/24 (2006.01); F01L 13/00 (2006.01); F02D 41/00 (2006.01); F01L 1/18 (2006.01); F01L 1/344 (2006.01); F01L 1/053 (2006.01); F02D 41/14 (2006.01);
U.S. Cl.
CPC ...
F02D 13/06 (2013.01); F01L 1/2405 (2013.01); F01L 1/3442 (2013.01); F01L 13/0005 (2013.01); F01L 1/185 (2013.01); F01L 2001/0537 (2013.01); F01L 2001/3443 (2013.01); F01L 2001/34423 (2013.01); F01L 2001/34426 (2013.01); F01L 2013/001 (2013.01); F01L 2810/02 (2013.01); F01L 2820/01 (2013.01); F02D 41/0087 (2013.01); F02D 2041/0012 (2013.01); F02D 2041/1431 (2013.01); F02D 2200/023 (2013.01); F02D 2200/024 (2013.01); Y02T 10/18 (2013.01);
Abstract

A hydraulic control system for an engine having a plurality of cylinders includes: valve stop mechanisms that switch the engine from all-cylinder operation to cylinder cut-off operation; a VVT that can change the timing to open and close valvesduring all-cylinder operation and cylinder cut-off operation; an oil pump that supplies oil to hydraulically operated devices including the valve stop mechanisms and the VVT through a hydraulic path; and a control device. The control device controls a maintaining oil pressure, which is required to maintain the operated state of the valve stop mechanisms during cylinder cut-off operation, so that the maintaining oil pressure is set to a high value in a high oil viscosity region.

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