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:
Nov. 05, 2002
Filed:
Dec. 04, 2000
Yasuhiro Takahashi, Tokyo, JP;
Koichi Okamura, Tokyo, JP;
Mitsuru Koiwa, Tokyo, JP;
Tsutomu Morishita, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
To obtain a knock control apparatus for internal-combustion engine having a function of judging whether or not the causes for failure have been solved for returning to normal knock control at the time of the solution, and capable of easily judging failure even in a failure mode in which it is difficult to raise the filter value and it is difficult to judge the failure. A fail control means includes: a failure judgment unit for judging failure for each cylinder based on output from a background level setting unit and a knock suppression and control unit ; number of fail cylinders judgment unit for judging the number of fail cylinders based on output from the failure judgment unit ; a retard angle changing unit for changing at least the real retard angle of a fail cylinder based on output from the knock suppression and control unit , the failure judgment unit and the number of fail cylinders judgment unit ; and a normal judgment returning unit for returning to normal ignition timing retard when a cylinder under judgment for failure meets normal judgment requirements based on the output from the background level setting unit and the retard angle changing unit