Method of and apparatus for controlling the idling speed of an engine
US4378768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1981 |
| Grant date | Apr 5, 1983 |
| Priority date | — |
| Expiry date | Jul 24, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2011/102
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An engine includes a main intake passage having a throttle valve therein. A bypass passage branches off from the main intake passage upstream of the throttle valve and connects again to the main intake passage downstream of the throttle valve. A flow control valve, actuated by a step motor, is arranged in the bypass passage. When the speed difference between the desired idling speed and the actual idling speed is higher than 20 r.p.m., the step motor is rotated in a direction wherein the actual idling speed approaches the desired speed. Contrary to this, when the above-mentioned speed difference is lower than 20 r.p.m., the step motor remains stationary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.