Engine air-fuel ratio controller
US5765533A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1997 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Apr 18, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/021
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In engine feedback control, a target air-fuel ratio corresponding amount is computed according to engine running conditions. A steady state deposition amount is also computed according to the target air-fuel ratio corresponding amount and engine running conditions. A difference between the steady state deposition amount and the deposition amount at that time is calculated, and a deposition rate is computed based on a quantity proportion. A basic injection amount is corrected by the target air-fuel ratio corresponding amount, and this corrected value is again corrected by the deposition rate so as to calculate a final injection amount. As the steady state deposition amount varies according to the target air-fuel ratio corresponding amount according to this invention, overrichness or overleanness due to insufficiency of the transient correction amount when the target air-fuel ratio corresponding amount is changed, is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.