Robert Boschgmbh

Oliver Schulz

Thomas Wieland

Rainer Peck

Oliver Becker

Roberto Scarfone

Martin Friedrich

Christoph Benz

Jochen Walther

Lars Hermann

A method for controlling a pressure () in an injection system () for an engine () of a vehicle () comprises the following steps: determining whether the vehicle () is decelerating; reducing the delivery rate of a high-pressure pump () that supplies fuel to the injection system (); reducing the pressure in the injection system () to a standstill pressure (p) by means of idle operation of the engine (); estimating a standstill time (t) at which the vehicle () comes to a standstill; and reducing the delivery rate of the high-pressure pump () before the standstill time (t) is reached, such that the standstill pressure (p) is attained in the injection system () at the standstill time (t).

Controlling the fuel pressure in an injection system

A method and a device for exciting pressure fluctuations in a fuel supply system of an internal combustion engine are provided, which in turn enable a determination of the sound velocity of the fuel. A quantity that characterizes the pressure in a fuel storage device or a fuel line is evaluated. In at least one operating state of the internal combustion engine, a natural oscillation of the fuel in the fuel storage device or the fuel line is excited.

Method and device for exciting pressure fluctuations in a fuel supply system of an internal combustion engine

A device and a method for determining pressure fluctuations in a fuel supply system provide two signal filters to enable determining as much information about pressure fluctuations as possible with minimal sensor use. A sensor signal which is characteristic of a pressure in the area of a fuel injector is filtered using the two filters, which have filter characteristics that differ from one another.

Device and method for determining pressure fluctuations in a fuel supply system

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Stuttgart, Germany

Oliver Schulz