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:
Dec. 08, 2015
Filed:
Sep. 06, 2012
Takashi Kagoshima, Obu, JP;
Tokutada Takahashi, Obu, JP;
Takashi Kagoshima, Obu, JP;
Tokutada Takahashi, Obu, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
When an idle speed control is implemented, an engine speed is computed based on an output signal of a crank angle sensor at a specified processing angle interval, and a time interval corresponding to the specified processing angle interval is computed. Then, the engine speed is filtered at a specified processing time interval, and a feedback amount (throttle opening correction amount) is computed based on a deviation of an engine speed filtered by a filter portion from a target engine speed. A time constant of a filtering processing is established according to the processing angle interval. Therefore, a filtering processing and a feedback control processing are performed in synchronization with each other, and an instability of an output of the feedback control (feedback amount) can be reduced.