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:
May. 22, 2001
Filed:
Jan. 05, 2000
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system associated with at least an intake valve, comprises a control unit controlling an intake-air quantity of air entering the internal combustion engine based on at least one of an intake valve open timing and an intake valve closure timing of the intake valve. The control unit determines a desired internal pressure in an intake-air passage based on a predetermined operating parameter, and detecting an operation delay-time fluctuation rate for at least the intake valve. A desired intake-air quantity is arithmetically calculated on the basis of engine operating conditions. The control unit includes a compensation section which compensates for the desired internal pressure based on at least one of the operation delay-time fluctuation rate and the desired intake-air quantity to produce a compensated internal pressure. A throttle opening is controlled depending on both the compensated internal pressure and the desired intake-air quantity. Also, the intake valve open timing and the intake valve closure timing are controlled depending on both the compensated internal pressure and the desired intake-air quantity.