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:
Jun. 12, 1990
Filed:
Jan. 23, 1989
Takanori Fujimoto, Himeji, JP;
Toshiro Hara, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A fuel control system for an internal combustion engine for controlling fuel supply rate on the basis of the output signal of a vortex flowmeter having variable-frequency filter means, capable of accurately measuring intake air flow to control the fuel supply rate accurately avoiding the erroneous measurement of noises generated during the rapid deceleration of the engine in which the throttle valve is shut. The fuel supply system has operating mode detecting means for detecting the operating mode of the engine, and passband fixing means for fixing the passband of the variable-frequency filter means at a predetermined passband when the operating mode detecting means detects that the engine is in a predetermined deceleration mode. The passband of the variable-frequency filter means is fixed at the predetermined passband while the engine is in the predetermined deceleration mode to enable accurate control of fuel supply rate by eliminating noise signals which is generated during the predetermined deceleration mode and superposed on the operating mode detection signal. When the engine is accelerated during a time period subsequent to the end of the predetermined deceleration mode, the fixation of the passband of the variable-frequency filter means is cancelled.