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:
Jan. 11, 2011
Filed:
Oct. 17, 2007
Eiichiro Ohata, Kasama, JP;
Shiro Yamaoka, Hitachi, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Hiroaki Hoshika, Hitachiohmiya, JP;
Kaori Kashio, Hitachinaka, JP;
Eiichiro Ohata, Kasama, JP;
Shiro Yamaoka, Hitachi, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Hiroaki Hoshika, Hitachiohmiya, JP;
Kaori Kashio, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A control apparatus of an EGR control valve has an EGR control valve has an exhaust gas recirculation passage to circulate exhaust gas of an combustion engine from an exhaust gas passage to an intake air passage. A measurement unit measures a flow rate of EGR gas flowing in the exhaust gas recirculation passage, and a controller receives an input from the measurement unit and closes the EGR control valve if the EGR-gas flow rate is smaller than a predetermined threshold value when the EGR gas is flowing from the exhaust side to the intake side of the internal combustion engine.