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:
Apr. 03, 2007
Filed:
Jan. 12, 2006
Eiji Takemoto, Obu, JP;
Masato Katsuno, Anjo, JP;
Tatsuya Fujita, Obu, JP;
Kunio Nanba, Anjo, JP;
Yoshinori Nakayama, Hoi-gun, JP;
Eiji Takemoto, Obu, JP;
Masato Katsuno, Anjo, JP;
Tatsuya Fujita, Obu, JP;
Kunio Nanba, Anjo, JP;
Yoshinori Nakayama, Hoi-gun, JP;
Denso Corporation, , JP;
Nippon Soken, Inc., , JP;
Abstract
A valve control device corrects a change rate of an opening degree of a valve in accordance with engine rotation speed when deposit elimination operation is performed. The valve control device corrects an inclination between a positive maximum opening degree and a negative maximum opening degree of the valve in accordance with the engine rotation speed when the deposit elimination operation is performed. Thus, when the engine rotation speed is low and a noise accompanying the deposit elimination operation becomes more audible, the change rate of the opening degree of the valve is reduced. As a result, the noise accompanying the deposit elimination operation is reduced and annoyance for vehicle occupants is reduced.