Patent ID: 7108200
Filing Date: 2006-09-19
Classification: F02M

Abstract:
1. In a fuel injector, the improvement comprising: a nozzle to discharge fuel; a needle disposed within the nozzle to control the discharge of fuel from the nozzle; an intensifier having a first intensifier chamber and an actuation chamber, the intensifier also having a first actuation piston in a first actuation chamber configured to force an intensifier piston in the intensifier chamber to move with the first actuation piston when a first actuation fluid under pressure is coupled to the actuation chamber to pressurize fuel in the intensifier chamber, the first actuation piston having a larger area than an intensifier piston; a first electrically controlled valve system coupled to the actuation chamber, to a first port adapted to couple to the first actuation fluid under pressure, and to a second port adapted to couple to a return for the first actuation fluid, the first electrically controlled valve system coupling the first port to the actuation chamber when in a first state and coupling the actuation chamber to the second port when in a second state; a first hydraulically controlled valve in a passage between the intensifier chamber and the nozzle, the first hydraulically controlled valve coupling the intensifier chamber to the nozzle when in a first state, and coupling the nozzle to the port adapted to couple to a return for fuel when in a second state; and, a second electrically controlled valve system coupled to the first hydraulically controlled valve, to a port adapted to couple to a second actuation fluid under pressure, and to a port adapted to couple to a return for the second actuation fluid, the second electrically controlled valve system coupling the first port to the hydraulically controlled valve when in a first state to cause the hydraulically controlled valve to move to a first state, and coupling the second port to the hydraulically controlled valve when in a second state to allow the hydraulically controlled valve to move to a second state.