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:
Feb. 05, 1991
Filed:
Nov. 08, 1989
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A rotational speed controller for an internal combustion engine of a vehicle has an air bypass passage which bypasses the throttle valve of the engine. A solenoid valve controls the air intake rate through the bypass passage. The output current of a generator which is driven by the engine is monitored by a current sensor. Based on the current which is sensed, an air intake adjuster calculates the change in the air intake rate through the bypass passage necessary to compensate for the load exerted on the engine by the generator so as to maintain a constant engine speed. The solenoid valve is controlled to change the air intake rate through the bypass passage by the amount calculated by the air intake adjuster. The change in the air intake rate can be calculated on the basis of the level of the generator current and/or the rate of change of the generator current. When a period sensor detects that the generator current is fluctuating with a prescribed amplitude and period, the air intake adjuster calculates the change in the air intake rate on the basis of the average value of the generator current. At other times, it calculates the change in the air intake rate using the instantaneous value of the generator current.