Robert Boschgmbh

Hans-Friedrich Schwarz

Dirk Hofmann

Martin Scheffel

Joerg Kuempel

Gerhard Stokmaier

Norbert Mittwollen

Norbert Alaze

Klaus Joos

Werner Hess

Thomas Frenz

Michael Friedow

Bernd Schroeder

Alexander Schenck Zu Schweinsberg

Timm Hollmann

Juergen Haecker

Helmut Staib

Peter Schenk

Valentin Schubitschew

Michael Bauer

Steffen Schneider

Juergen Eckhardt

Burkhard Hiller

Ulrich Pechtold

Egon Stratmann

Jurgen Lander

Hubert Eith

Gerhard Hahl

A method for ascertaining a setpoint value for a manipulated variable for the actuation of a low-pressure pump in a fuel-supply system for an internal combustion engine having a high-pressure accumulator and a high-pressure pump, the high-pressure pump being operated in a full delivery mode, and the low-pressure pump being actuated so that a pressure provided by the low-pressure pump is reduced, and the setpoint value at which a dip in a delivery quantity of the high-pressure pump is detected is ascertained while taking into account an actuation value of the manipulated variable.

Method for ascertaining a setpoint value for a manipulated variable for actuating a low-pressure pump

A method and control unit for a start of an Otto engine operated at low temperatures, using ethanol and/or gasoline, having direct injection. The method includes generating by a high pressure pump a fuel pressure in a high pressure system connected to a high pressure reservoir; a sensor monitoring the fuel pressure in the reservoir and the system; injecting the fuel, by an injector, from the reservoir into a cylinder of the engine, the fuel pressure, an injection quantity and a fuel quantity being specified by a control unit based on, sensor the fuel pressure being specified based on the operating point of the engine up to an upper pressure which is below a starting pressure to which the fuel is increased before the fuel injection, and the fuel pressure in the reservoir and the system being limited to a maximum by an opening pressure of a limiting valve.

Method and control unit for starting an otto engine

A method for operating an inductive load, which is operated in a motor vehicle with electric voltages of different magnitudes, is provided, a current rise in the inductive load being influenced by selecting pulse lengths and pulse pauses of the electric voltage.

Method and device for operating an inductive load with different electric voltages

The valve ( ) has a seat valve ( ) comprising a hollow cone-shaped valve seat ( ) and an hemispherical shutoff element ( ). An afflux bore ( ) having contact with a pressure-medium inlet ( ) discharges centrically into the valve seat ( ). A solenoid armature ( ) acting upon the seat valve ( ) in opening fashion grips a push rod ( ) comprising the shutoff element ( ). The solenoid armature cooperates with a pole body ( ) according to the flat-type armature principle. A preloaded return spring ( ) acting on the seat valve ( ) in closing fashion is arranged between the pole body ( ) and the solenoid armature ( ). The valve ( ) works as a proportioning valve, because, in addition to a suitable design of the seat valve ( ) and push rod ( ), the magnetic force is infinitely variable and, together with a hydraulic force, has a monotonously increasing course as the valve opening stroke increases, while the spring force&mdash;which also has a monotonously increasing course as the valve opening stroke increases&mdash;has a positive slope that is greater than that of the course of the magnetic and hydraulic force.

Electromagnetically actuated valve, especially for hydraulic braking systems in motor vehicles

Oscillation damper for damping fluid oscillation in a hydraulic

Controllable valve

Electromagnetically controllable valve arrangement

A solenoid valve having a first seat valve for performing a closing function and a second seat valve, connected in parallel thereto, for a pressure-limiting function. A pressure medium spilled by the second seat valve flows off through a flow-off bore acting as a throttle. Pressure surges are thus largely avoided in the part of the brake system located on the flow-off side. The solenoid valve can be used in controlled-slip hydraulic brake system of motor vehicles.

Solenoid valve with pressure limitation for controlled-slip motor

Growing community of inventors

Muehlacker, Germany

Hans-Friedrich Schwarz