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. 10, 2010
Filed:
Dec. 21, 2007
Susumu Kojima, Susono, JP;
Fumiaki Hattori, Mishima, JP;
Susumu Kojima, Susono, JP;
Fumiaki Hattori, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An internal combustion engine includes a low-pressure fuel feed system that feeds low-pressure fuel pressurized by a feed pump to first delivery pipes through a low-pressure fuel feed pipe, first injectors capable of injecting the low-pressure fuel into intake ports, a high-pressure fuel feed system that feeds high-pressure fuel pressurized by a high-pressure pump to second delivery pipes through a high-pressure fuel feed pipe, and second injectors capable of injecting the high-pressure fuel into combustion chambers. A bypass passage communicates the first delivery pipe with the second delivery pipe, and a check valve is provided in the bypass pipe for preventing flow of the fuel from the second delivery pipe to the first delivery pipe. Thus, transmission of fuel pressure pulsation caused by driving of the high-pressure pump is effectively restricted, so that an appropriate amount of fuel can be supplied to the engine for improved control of the air/fuel ratio.