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:
Feb. 20, 1996
Filed:
Dec. 21, 1994
Yuichi Shimasaki, Wako, JP;
Masaki Kanehiro, Wako, JP;
Hirokazu Ohsaki, Wako, JP;
Jiro Takagi, Wako, JP;
Katsumi Noguchi, Wako, JP;
Kanehisa Kitukawa, Aichi, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A misfire-detecting system for an internal combustion engine detects occurrence of a misfire in the engine, based on voltage between both ends of a spark plug assumed when sparking discharge takes place at the spark plug. A diode is arranged in an ignition secondary circuit of the engine, for checking reverse current flowing in the circuit in a direction reverse to the direction of flow of current occurring when spark ignition takes place at the spark plug. An ECU detects reverse current flowing in the ignition secondary circuit, and detects an abnormality of the diode, based on the detected reverse current.