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:
Sep. 18, 2007
Filed:
May. 15, 2006
Shiro Yamaoka, Hitachi, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Shinya Igarashi, Naka, JP;
Katsuaki Fukatsu, Naka, JP;
Takashi Kadohiro, Hikari, JP;
Hidefumi Iwaki, Hitachinaka, JP;
Takanobu Ichihara, Hitachinaka, JP;
Shiro Yamaoka, Hitachi, JP;
Yoshihiro Sukegawa, Hitachi, JP;
Noboru Tokuyasu, Hitachinaka, JP;
Shinya Igarashi, Naka, JP;
Katsuaki Fukatsu, Naka, JP;
Takashi Kadohiro, Hikari, JP;
Hidefumi Iwaki, Hitachinaka, JP;
Takanobu Ichihara, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In an engine having a premixed combustion mode, an EGR flow rate estimating precision is deteriorated at a transient time, and a torque fluctuation and an exhaust gas deterioration are caused. In an engine control apparatus having a premixed combustion mode and a diffusion combustion mode, a sensor detecting an EGR flow rate is arranged in an EGR flow path of the engine, and a cylinder state of the engine is estimated by using an output value of the sensor detecting the EGR flow rate at a time when the engine is in the premixed combustion mode. Since it is possible to accurately detect the EGR flow rate at the transient time and feed back the EGR flow rate at a high response, it is possible to prevent a torque fluctuation and an exhaust gas deterioration.