Piezoelectric actuated fuel injectors
US6811093B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 2003 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | May 6, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M69/048
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector including a piezoelectric actuator directly attached to a metering rod wherein when the actuator is distorted in proportion to an input voltage, the metering rod moves to vary the size of a discharge spray orifice. The input voltage, and therefore the distortion of the actuator, may be varied in accordance with the readings from a throttle position sensor or an oxygen sensor, for example. A dual actuator type of fuel injector is also provided which has an injector body in engagement with the combustion chamber and a fuel chamber therein to receive low pressure fuel. A piezoelectric actuator moves a piston to close the fuel chamber inlet and pressurize the fuel therein. A second piezoelectric actuator moves the metering rod to open the discharge orifice. The amount of distortion of the respective actuators effects proportional movement of the piston or the metering rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.