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. 24, 1995
Filed:
Jul. 28, 1993
Naoyuki Kamiya, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A rotational speed control apparatus for internal combustion engines is constructed so that, when drive control of an idling speed control valve is performed based on a reference control quantity of the idling speed control valve, a highland learning value or a lowland learning value is stored for the idling speed control and a feedback correction quantity is computed for the idling speed control, in order to control a rotational speed of an internal combustion engine for a vehicle at a desired rotational speed, which is set in accordance with an engine temperature, at the time of an idling operation of the internal combustion engine. It is therefore possible to prevent an excessive drop in the rotational speed or a stall of the internal combustion engine, which occurs after the vehicle has descended a slope to a lowland, due to erroneous learning which is caused when the vehicle descends a slope from a highland to a lowland while travelling from a lowland to a highland and then to a lowland and so on.