Constant-speed multi-pressure fuel injection system for improved dynamic range in internal combustion engine
US7318414B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2002 |
| Grant date | Jan 15, 2008 |
| Priority date | — |
| Expiry date | Jul 24, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M37/0052
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection system operates under a substantially constant pump speed and creates multi-pressure levels by diverting the fuel flow. Fuel pressure can be switched from one steady pressure level to another level on-demand instantly. This superimposes and overlaps typical fuel injection events in the linear operating ranges under different pressure levels, significantly increasing the fuel injection dynamic range. Lower fuel injection when idle or during city driving reduces fuel consumption per mile traveled and reduces exhaust emission that causes smog in metropolitan areas. The system delivers additional power to the engine instantly at peak load on-demand, reduces idle speed with the engine running smoothly, does not change fuel tank temperature, and may enhance the life of the fuel pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.