Control system for lean-burn internal combustion engine
US5483939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/501
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
ECU includes a lean air/fuel ratio coefficient setting device, an accelerated stoichiometric-burn operation air/fuel ratio coefficient setting device, a meeting-of-lean-burn-operation-conditions determining device, a throttle position change detector, an acceleration criterion setting device, an end-of-acceleration determining device and an acceleration determining device. When a detected vehicle speed has been determined to be in a high-speed range faster than a threshold and an acceleration is determined to have ended, a relatively large value is set as an acceleration criterion only for a predetermined period. During a lean-burn operation, ECU compares output information from the throttle position change detector with the acceleration criterion set by the acceleration criterion setting device and if the output information is greater than the acceleration criterion, determines an accelerated operation and changes the mixing ratio of fuel to air to a stoichiometric ratio (or a rich ratio). Otherwise, the air/fuel ratio is controlled at a lean ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.