Idling speed control device of an internal combustion engine
US4412517A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 21, 1981 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Apr 21, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18664
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An idling speed control device of an internal combustion engine comprising a bypass passage which interconnects the intake passage located upstream of the throttle valve to the intake passage located downstream of the throttle valve. A flow control valve is arranged in the bypass passage and actuated by a step motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of an engine at a predetermined speed. The step motor comprises a screw threaded valve shaft and a rotor rotatably mounted on the valve shaft and having a screw threaded center hole which is in engagement with the screw threads of the valve shaft. The valve shaft is supported by bearings so that the valve shaft cannot be rotated, but is able to move in the axial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.