Method of detecting opening of a throttle valve in a fully closed position in an internal combustion engine
US4581924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1985 |
| Grant date | Apr 15, 1986 |
| Priority date | — |
| Expiry date | May 22, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2250/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of detecting the opening of a throttle valve in a fully closed position in an internal combustion engine. A first predetermined opening value larger than the minimum opening value of the throttle value determined by structural factors is stored as an initial value of a fully closed position-discriminating variable, while a second predetermined opening value smaller than the minimum opening value is stored as an initial value of a stored opening value of the throttle valve in the fully closed position detected by a throttle valve opening sensor. The fully closed position-discriminating variable is updated or set to a newly detected throttle valve opening value when the latter is smaller than the former. Then, the stored opening value of the fully closed throttle valve is updated or set to the thus updated fully closed position-discriminating variable when the latter continues to be substantially equal to throttle valve opening values subsequently detected over a predetermined period of time after the updating of the fully closed position-discriminating variable has been carried out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.