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:
Mar. 17, 1992
Filed:
Mar. 05, 1990
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An air and fuel supply control system for an internal combustion engine comprises a plurality of superchargers including a turbosupercharger, an intake air cutoff valve operative selectively to be open and closed respectively for opening and closing one of separated intake passages in which a compressor of the turbosupercharger is disposed, an intake air relief valve operative selectively to be open and closed respectively for opening and closing a relief passage provided for detouring the compressor of the second supercharger, a cutoff valve controller operative to control the intake air cutoff valve to be closed so that the turbosupercharger is restrained from supercharging the engine and to be open so that the turbosupercharger works for supercharging the engine, a relief valve controller operative to control the intake air relief valve to be closed before the intake air cutoff valve is opened and to be open after the intake air cutoff valve is closed, an air flow sensor for detecting intake air mass flow passing through an intake passage from which the separated intake passages are branched, a fuel supply controller operative to control quantity of fuel supplied to the engine in accordance with a detection output obtained from the air flow sensor, and a fuel supply revising device operative to revise the quantity of fuel supplied to the engine when the intake air relief valve is caused to be open and closed selectively.