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. 29, 1988
Filed:
Dec. 03, 1987
Masanori Sakamoto, Tokyo, JP;
Takuro Morozumi, Mitaka, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An engine has a bypass around a throttle valve and a solenoid operated idle speed control valve provided in the bypass. The control valve is driven by driving pulses duty ratio of which is dependent on a coolant temperature and an old learning correction value. Temperature of a solenoid of the control valve is converted to voltage. A map is provided for storing normal temperature duty ratios, one of which is derived from the map in dependence on duty ratio of the driving pulses and the voltage. Difference between the duty ratio of the driving pulses and the derived normal temperature duty ratio is stored in a memory. When an ignition switch is turned off, the difference is added to the old learning correction value to produce a new learning correction value. The new learning correction value is used for a subsequent engine operation instead of the old learning correction value.