Robert Boschgmbh

Rudolf Moz

Helmut Denz

Alfred Kratt

Klemens Grieser

Werner Jundt

Robert H Entenmann

Winfried Langer

Juergen Foerster

Thorsten Allgeier

Christian Mengler

Jens Thurso

Winfried Uttenweiler

Winifred Uttenweiler

Jurgen Stock

Harald Krempel

Jürgen Foerster

In a method for generating an internal combustion engine configured to run on both a gas fuel and a liquid fuel, the shutoff valve of the gas injection system is initially closed, the engine is then operated with the liquid fuel, and subsequently all gas injection valves of the gas injection system are opened in a predefined pattern while the shutoff valve is still closed.

Method and device for operating a gas injection system of a gas fuel and a liquid fuel operated internal combustion engine

A method of ventilating vapors from a fuel tank into an intake pipe of an internal combustion engine in the upper partial-load range and in the region of the full load on the internal combustion engine, a regeneration valve is first of all moved into an open position and a shut-off valve provided in a ventilating conduit of an adsorption filter is then closed. The fuel vapors then flow into the intake pipe by virtue of the intake pipe vacuum and assisted by the vapor pressure of the fuel in the fuel tank and then burned in at least one combustion space of the internal combustion engine. The method according to the invention for ventilating a fuel system is intended for use in motor vehicles.

Method for ventilating a fuel system for an internal combustion

The invention relates to a method and an arrangement for monitoring the operability of a heater of an oxygen-measuring probe which is mounted in the exhaust-gas channel of an internal combustion engine. The principle of operation of the invention is based on the fact that the supply voltage of the probe heater drops during loading by the electrical resistance of the heating element. The voltage difference is dependent upon the magnitude of the resistance and therefore at least the three states can be distinguished, namely: normal operation, circuit interruption and short circuit. The operational state of the probe heater which is so determined is displayed to the driver by activation of a corresponding control unit and/or is stored, as required, in a fault memory. The arrangement according to the invention can be realized by a computer or in a compact configuration and is suitable for use in a central control apparatus.

Method and arrangement for monitoring the operability of a heater of an

The invention is directed to a sequential fuel injection method wherein the first injection end time point is determined at which the preinjections end. In addition, the first intake end time point is determined at which a signal occurs for the first time after the start of the method which is evaluated as a signal that indicates the end of an induction operation. Furthermore, a determination is made for which cylinder the above-mentioned time point applies. If the first-mentioned time point lies ahead of the second-mentioned time point, the sequential fuel injection is started for the determined cylinder. For the opposite position of the mentioned time points, the injection valve for that particular cylinder is driven whose induction cycle follows the determined cylinder with the injection valve being so driven that the entire fuel quantity is injected which was computed for the sequential injection. The method of the invention assures that an internal combustion engine receives a proper injection as soon as possible after the start thereof without an overenrichment of the mixture for the individual cylinders.

Method for sequentially injecting fuel

Ignition and fuel injection back-up system for emergency running of

The invention is directed to a method for compensating for the tank venting error in a learning fuel metering system metering the required fuel quantity to an internal combustion engine. The method includes carrying out the lambda correction with adaptively learned precontrol values also in phases of the tank venting so that the disturbing quantities which are introduced by the tank venting can likewise be learned out; however, the obtained learn values are entered in separate memory locations dependent upon whether they have been determined during the basic adaptation or during the adaptation with tank venting. These learn values are switched to the lambda control as precontrol corrective values in accordance with the time control determining the sequence of the base adaptation phases and tank venting adaptation phases. The invention is also directed to an apparatus for carrying out the steps of the method of the invention.

Method for compensating for a tank venting error in an adaptive learning

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Moglingen, Germany

Rudolf Moz