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:
Jan. 03, 1989
Filed:
Feb. 29, 1988
Hidetoshi Kato, Suzuka, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
In a battery charging system for an automobile, the conduction rate of a switching circuit which controls field current of the generator is detected, while engine speed is also detected. Since the conduction rate represents the actual amount of electricity generated by the generator, the conduction rate as well as engine speed is used to determine optimal engine idle speed. To this end desired conduction rate values for various engine speeds within idle speed range are prestored in a memory, and a desired conduction rate is read out using detected engine speed so that a detected conduction rate will be compared with the desired conduction rate. Using the result of comparisonn, idle speed is either increased or decreased so that the actual conduction rate approaches the desired conduction rate. In one embodiment, the generator is disabled when the actual conduction rate is greater than the desired conduction rate in order to prevent engine stall.