Piezoelectric low-pressure fuel injector
US4635849A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1985 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/789
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A piezoelectric fuel injector for use in fuel injection systems of spark-ignition engines is provided with a normally closed valve assembly in the form of a reed valve. The valve assembly includes a valve plate having one or more outlet ports having an overall cross-sectional flow area sufficient to ensure an unobstructed flow path therethrough. The valve assembly also includes a generally flat, thin, resilient closure member cooperating with the valve set of the valve plate. The pressure wave created in the fuel in the pumping chamber upon excitation of the piezoelectric actuator propagates into the outlet ports to directly reach the thin closure member, which readily resiliently yields to permit a desired amount of fuel to be injected into the engine cylinders. The fuel injector is particularly suitable to be operated by a high-frequency drive signal in order to ensure precise metering of fuel quantity over a wide range of engine operating conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.