The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 12, 2002
Filed:
Feb. 25, 2000
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A configuration for amplifying fuel pressure for a fuel injector includes a pressure amplifier having a control space on a low-pressure side, a working space on a high-pressure side, and a moveable ram disposed between the control and working spaces. The control space is connected to an accumulator through a pressure line, and the working space is connected to a fuel line. The device includes an actuator connected to a servovalve for changing between an actuated switched state and an unactuated initial state. In the pressure line is the servovalve between the pressure supply and the control space, which opens the pressure line in the unactuated initial state, and interrupts the pressure line and keeps unpressurized the control space in the actuated switched state. A method for amplifying the fuel pressure includes: connecting the pressure supply to the pressure amplifier, and to the control space through the pressure line; connecting the working space to an injection nozzle with the fuel line; placing the servovalve in the pressure line between the pressure supply and the control space; connecting the actuator to the servovalve; opening the pressure line with the servovalve when the actuator is unactuated; and interrupting the pressure line and keeping unpressurized the control space with the servovalve upon actuation.