Throttle control system for vehicular internal combustion engine
US5002028A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jul 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S188/01
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Throttle control system for a vehicular internal combustion engine equipped with a stepper motor connected to a throttle valve provided at an engine air intake passage, wherein the position (the opening degree) of the throttle valve is controlled by the stepper motor in response to the vehicular engine operation. In one embodiment, various throttle positions are once determined including positions for engine idling and vehicle cruising and the largest of the positions is selected for optimally satisfying the whole operating condition. In another embodiment, when the engine is idling, the throttle valve is controlled such that engine speed converges toward a target speed. In the other embodiment, the stepper motor is varied its pulse rate and chopping duty for optimally control the throttle position according to the vehicular engine operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.