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. 18, 1984
Filed:
Feb. 25, 1982
Matsujyu Yoshida, Bisai, JP;
Nobuyuki Inoue, Kariya, JP;
Hideo Miyagi, Okazaki, JP;
Toshio Suematsu, Toyota, JP;
Akihiko Kido, Toyota, JP;
Nippondenso Co., Ltd., Kariya, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Abstract
An ignition timing control system for an internal combustion engine having a plurality of cylinders in which at each of different load conditions determined by the operating conditions of the engine the ignition timing for each cylinder is periodically retarded to cause a nonknocking ignition and the resulting background vibration levels detected by a knock sensor are stored in a memory. During the normal operation, the vibration level detected by the knock sensor with respect to each cylinder is compared with the corresponding background vibration level stored under the same load condition to detect the presence of knocking and thereby to determine the proper ignition timing.