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. 03, 2021
Filed:
Oct. 22, 2019
Applicants:
Denso Corporation, Kariya, JP;
Mazda Motor Corporation, Hiroshima, JP;
Inventors:
Assignees:
DENSO CORPORATION, Kariya, JP;
MAZDA MOTOR CORPORATION, Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02M 57/00 (2006.01); F16K 37/00 (2006.01); G01M 15/09 (2006.01);
U.S. Cl.
CPC ...
F02M 57/005 (2013.01); F16K 37/0066 (2013.01); G01M 15/09 (2013.01);
Abstract
An estimation unit estimates a fuel pressure on a discharge side of a high-pressure pump based on an amount of fuel injection with a fuel injection valve from a time point at which a detected fuel pressure changes from a higher status than a first pressure to a lower status, assuming that the fuel has not been discharged with the high-pressure pump. The determination unit determines that a relief valve is in an open status based on a dropping mode of the estimated fuel pressure and a dropping mode of the detected fuel pressure.