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. 07, 1999
Filed:
Oct. 20, 1997
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., , JP;
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123399 ; 123396 ; 123397 ;
Abstract
It is an object to improve the opening control resolving power in the case where the opening/closing of a throttle valve is controlled by a motor driven actuator. An additional control signal for finely vibrating the throttle valve is given to the actuator in a specific period until the opening of the throttle valve approaches its target value. Consequently, the throttle valve vibrates finely only as occasion demands. Accordingly, in spite of the fact that the opening of the throttle valve can be controlled with finer control resolving power than ordinary control resolving power, good response can be obtained as a whole.