Negative pressure control apparatus for engine mounted in vehicle
US6321716A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jun 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A brake booster is actuated based on negative pressure in an intake passage. When an engine is operating in the stratified charge combustion, an ECU decreases the throttle opening size to lower the pressure in the intake passage if the pressure in the brake booster, or a booster working pressure, is higher than a demanded value. When the booster working pressure is lower than the demanded value, the ECU increases the throttle opening size as the difference between the booster working pressure and the demanded value increases. Therefore, when the difference between the booster working pressure and the demanded value is small, the booster working pressure is rapidly lowered if the booster working pressure increases above the demanded value. When the difference between the booster working pressure and the demanded value is great, the pumping loss of the engine is decreased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.