Idle speed control system for internal combustion engine
US5265571A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1993 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Mar 24, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2011/102
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An engine idle speed control system is designed to perform a transient correction in order to prevent an idle engine speed of an internal combustion engine from being made unstable by a load of an auxiliary unit, such as an air conditioner of a vehicle. The idle speed control system comprises an idle control valve provided in a bypass passage bypassing a throttle valve disposed in an intake passage of the engine, and a controller for controlling the idle engine speed by manipulating the opening degree of the idle control valve. The controller increases the opening degree of the idle control valve transiently when the load of the auxiliary unit is applied, and then decreases the opening degree with passage of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.