Robert Boschgmbh

Wolfgang Wagner

Ulrich Steinbrenner

Helmut Denz

Ernst Wild

Gunther Plapp

Eberhard Frech

Hong Zhang

Eberhard Schnaibel

Klaus Ries-Mueller

Matthias Kuesell

Ulrich Mayer

Volker Gandert

Gerard Melchior

Helmut Pflieger

Willi Rosenau

Christian-Ernst Schreder

Stephan Hohne

Jurgen Neubert

A diagnostic tester for motor vehicles is described, and programmable control units having self-diagnostic means are provided for in the motor vehicle that, in program-controlled fashion, control, monitor the engine control and other systems of the motor vehicle, generate error codes and store them, and which can be connected to an external diagnostic tester via a diagnostic/test plug in the motor vehicle. The external diagnostic tester is equipped with a program recognition and program loading device. The program version contained in the connected control unit is queried and recognized using the program recognition device. Then, if the program available in the motor vehicle and recognized via the diagnostic/test plug, available in the connected control unit of the motor vehicle is not stored in the latest and most current version, the respective latest version is loaded by the program loading device into the program storage device of the corresponding control unit.

Diagnostic test device for motor vehicle with programmable control devices

The invention is directed to a method and an arrangement for operating an internal combustion engine wherein the vapor pressure curve is determined with a pressure sensor in the fuel metering pipe during the shutoff phase of the engine and the fuel injection quantity in a subsequent start of the engine is corrected in correspondence to this pressure curve.

Method and arrangement for operating an internal combustion engine

A sensor element is proposed, particularly a lambda probe for analyzing exhaust gases in internal combustion engines, having a protective device which, at least region-wise, surrounds or covers a sensitive component of the sensor element exposed to a gas. Also provided is that the protective device has an arrangement or is joined to such an arrangement by which the admission of gas to the sensitive component is able to be regulated.

Sensor element having a protective device

A method and an apparatus for forming a fuel-air mixture for an internal combustion engine during a cold-starting and warmup phase. During the normal operation of the engine, fuel is evaporated by means of an evaporation and condensation system in order to recover low-boiling fuel components from the fuel delivered to first fuel delivery means during normal operation. The low-boiling fuel components condense and are collected as cold-starting fuel in a supply container. The engine, during the cold-starting and warmup phase, is supplied with cold-starting fuel from the supply container by means of second fuel delivery means, in order to reduce the concentration of hydrocarbons in the exhaust gas during the cold-starting and warmup phase.

Method and apparatus for forming a fuel-air mixture for an internal combustion engine during a warmup phase

A method of operating an internal combustion engine of a motor vehicle provided with a vacuum accumulator which provides an auxiliary energy required for at least one servo function of the internal combustion engine in form of a vacuum and which is acted upon by a vacuum acting in a suction pipe of the internal combustion engine. The method computes a pressure acting in the vacuum accumulator, supplies mass flows to the vacuum accumulator when at least one servo function is performed, and withdraws the mass flows from the vacuum accumulator when a pressure acting in the suction pipe is smaller than the pressure acting in the vacuum accumulator. The pressure acting in the vacuum accumulator is computed from a mass balance of the mass flows supplied to the vacuum accumulator and withdrawn from the vacuum accumulator.

Method of and device for operating a vacuum accumulator of an internal combustion engine, provided for servo function

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Korntal-Muenchingen, Germany

Wolfgang Wagner