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:
Mar. 23, 2010
Filed:
Nov. 20, 2007
Shiro Yamaoka, Hitachi, JP;
Eiichiro Ohata, Kasama, JP;
Jun Kubo, Hitachinaka, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Toshiki Otsuki, Kyoto, JP;
Hiroaki Hoshika, Hitachiohmiya, JP;
Shiro Yamaoka, Hitachi, JP;
Eiichiro Ohata, Kasama, JP;
Jun Kubo, Hitachinaka, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Toshiki Otsuki, Kyoto, JP;
Hiroaki Hoshika, Hitachiohmiya, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention prevents an EGR sensor installed in an engine's EGR path from being soiled by soiling substances in exhaust. A catalyst is positioned upstream of the EGR sensor to purify the soiling substances in EGR gas. The status of the EGR sensor is properly controlled in accordance with the conditions of the catalyst. This ensures the EGR sensor is less likely to be affected by the soiling substances in the exhaust under any circumstances of the EGR path and allows the EGR sensor to avoid a decrease in the accuracy of EGR gas detection. An alternative configuration may be employed such that the EGR gas recirculates from the downstream side of a catalyst installed in a main exhaust path.