Exhaust gas recirculation control system having a function of automatically correcting detected zero opening value of exhaust gas recirculation valve
US4409948A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1982 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Apr 29, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An exhaust gas recirculation control system which is adapted to control the valve opening of the exhaust gas recirculation valve so as to minimize the difference between a detected value of the valve opening of the above valve and a command value read from a memory as a function of operating condition of the engine. The system includes a memory means adapted to store as a new reference zero position value an actual value of the valve opening detected when a command value for full closing of the valve is continuously read from the memory for a predetermined period of time, and an arithmetic means adapted to perform substraction of the value stored in the above memory means from a subsequently detected value of the valve opening or addition of the stored value to a command value subsequently read from the memory, thereby automatically compensating for changes in the detected zero opening value of the exhaust gas recirculation valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.