Caterpillar Inc.

Hydac Filtertechnik Gmbh

Thomas Magnete Gmbh

Bernhard Kirsch

Alan Ray Stockner

Ronald Dean Shinogle

Clifford E Cotton, Iii

Olaf Ohligschlaeger

Rene Schulz

Ye Tian

David E Martin

Stephen Michael Wiley

Manfred Tumbrink

Otmar Sch&ouml;n

Manfred Muschalle

Electrically controlled fuel injection systems should be able to operate at low voltage. In order to operate an electrically controlled fuel injection system at low voltage, the voltage available to an electrical actuator is monitored. The electrical actuator is coupled to a valve positioned within a passageway in which high pressure actuation fluid flows to and from an hydraulically actuated device, such as a fuel injector and/or an engine brake. If the voltage available to the electrical actuator falls below a predetermined voltage, the pressure differential across the valve is reduced. Although the principal application of the present invention is in the fuel injection system, the present invention has application in any electrically controlled fluid system at low voltage.

Electrically controlled fluid system with ability to operate at low energy conditions

A solenoid having increased axial force and low static friction on the armature is disclosed and provides an improved solenoid-driven hydraulic valve actuator. The solenoid includes a coil member, a pole piece having an inside surface with recessed and non-recessed portions to form an inner recess in the pole piece, an armature inside the pole piece, and a bearing held in the recess between the pole piece and armature, the bearing having an inner surface extending inwardly just beyond the inside surface of the pole piece non-recessed portion.

High force solenoid and solenoid-driven actuator

A control system adapted to control an actuator between extended and retracted positions has a fluid control valve connected to the actuator a source of high pressure fluid and a reservoir. The fluid control valve is movable between a first position at which the actuator is connected back to the fluid reservoir adapted and a second position operable to connect the actuator to a high pressure actuation fluid source. An electronic control module is connected in control communication with the fluid control valve and adapted to automatically generate a control signal to position the control valve at the second position in response to an elapsed time being passed at which the fluid control valve is at the first position is greater than a predetermined time.

Fluid control valve actuating system

An arrangement monitors the useful properties of pressure fluids (,) in fluid-technical installations. A plurality of measured variables, each representing a useful property of the pressure fluid, are determined by a plurality of sensors (,) which are combined with a pump (,) to form a structural unit which can be build into a tank (,) containing the pressure fluid. The sensors (,) are hydraulically connected in series with the pump (,).

Arrangement for monitoring the useful properties of fluids

Growing community of inventors

Mandelbachtal, Germany

Bernhard Kirsch