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:
Oct. 08, 1985
Filed:
Jun. 21, 1983
Kenji Ikeura, Yokosuka, JP;
Nissan Motor Company, Ltd., , JP;
Abstract
An intake air flow rate control method and system for an internal combustion engine includes an open loop control strategy carried out during unstable engine driving conditions. During open loop control, a pulse signal applied to an air flow rate control valve means is determined both as a function of open loop ratio and feedback ratio. The duty cycle of the pulse signal for open loop control is varied corresponding to engine coolant temperature as well as engine load condition. Thus, upon switching control operation from open loop control to feedback control, varying of pulse duty cycle to be applied to the valve means occurs smoothly. Further, in open loop control, the control system smoothly follows variations in engine load conditions.