Patent ID: 8579207
Filing Date: 2013-11-12
Classification: F02M

Abstract:
1. A method of operating a fuel injector with direct needle control in an engine comprising: a) pressurizing by an intensifier in the fuel injector, to an injection pressure, a quantity of fuel at least adequate for one injection event when the engine is operating at full power; b) controlling an injection event by direct needle control wherein a valve controls an actuation fluid pressure on a piston area, the piston area acting directly on the needle to controllably: 1) hold the needle in a closed position against pressurized fuel in a needle chamber and 2) allow pressurized fuel in the needle chamber to move the needle to an open position for fuel injection; c) when the amount of pressurized fuel remaining after an injection event is at least adequate for a subsequent injection event, maintaining the pressure on the fuel for a subsequent injection event; and, d) when the amount of pressurized fuel remaining after an injection event is not adequate for a subsequent injection event, depressurizing the fuel and repeating a) through d).