Idle speed control apparatus for internal combustion engine
US4638778A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1986 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/1433
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.