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:
Jan. 27, 1987
Filed:
Feb. 19, 1986
Eiichi Kamei, Nagoya, JP;
Hideaki Namba, Oobu, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
Apparatus for controlling idle speed of an internal combustion engine (M1) equipped with fuel injection valves (M2) comprises a throttle actuator (M4) associated with a throttle valve (M3), engine speed detecting unit (M5), intake air quantity detecting unit (M6), and electronic control unit (M8) for controlling the fuel injection valves (M2) and the throttle actuator (M4). The electronic control unit (M8) comprises a target idle speed setting unit (M9), a target intake air quantity setting unit (M10), and an integral-added optimal regulator (M11) for determining feedback amounts respectively in connection with the amount of fuel to be injected and the opening degree of the fuel injection valves. In such apparatus, target intake air quantity is determined as a value which makes fuel supply amount minimum on the basis of correlation between intake air quantity and fuel supply amount when the target idle speed is made constant. The integral-added optimal regulator determines the amount of feedback on the basis of an optimal feedback gain predetermined according to the dynamic model of the system relating to the operation of the internal combustion engine. As a result, the rotational speed of the internal combustion engine is controlled to a target idle speed with high response and stability characteristic.