Robert Boschgmbh

Fridolin Piwonka

Ulrich Flaig

Wolf Wessel

Johannes Locher

Hermann Kull

Anton Karle

Gerhard Stumpp

Helmut Laufer

Ewald Eblen

Hermann Grieshaber

Wilhelm Polach

Gerhard Engel

Josef Wahl

Manfred Birk

Alfred Schmitt

Joachim Tauscher

Pierre Lauvin

Alf Loffler

Rainer Buck

Hermann Eisele

Thomas Kuttner

Ludwig Walz

Hans Kubach

Thomas Lenzing

Markus Klausner

Albrecht Sieber

Lutz Mueller

Wolfgang Grimm

Werner Zimmermann

Andreas Boehringer

Gerhard Schielinsky

Benedikt Feldmann

Albin Hassler

Reinhold Pfotzer

Waldemar Becker

Wolfgang Becker

A method and a control unit for operating an internal combustion engine of a motor vehicle are provided, in particular for controlling/regulating the internal combustion engine as a function of an air-mass sensor signal from a first air-mass sensor. A first auxiliary signal, which is obtained arithmetically from an additional sensory system or from models of the internal combustion engine, allows a plausibility control or the substitution of the air-mass sensor signal in the case of signal interference of the air-mass sensor signal, and thereby ensures that the internal combustion engine is able to continue working in the optimal operating point.

Method for operating an internal combustion engine

The invention relates to a method and arrangement for preparing a fuel-metering signal M for a diesel engine starting with measured variables such as accelerator pedal position, rotational speed, lambda, exhaust gas temperature or torque. A fuel quantity request MW is pregiven in dependence upon the position of the accelerator pedal. This quantity request MW is supplied to a minimum selector together with a second signal. The output signal M of the minimum selector, in turn, determines the metered fuel. The second signal derives from a precontrol characteristic field 50 in dependence upon the speed. The output signal of the precontrol characteristic field MV is influenced by the controller output signal MR in specific operating conditions.

Method and arrangement for controlling the fuel metered in a diesel

The invention is directed to a method and arrangement for controlling a self-igniting internal combustion engine. The arrangement includes at least one measured-value sensor, electronic control unit for forming a quantity signal for metering fuel, and a control unit for driving individual actuators for each cylinder. The actuators determine the quantity of fuel injected by the pump elements into the cylinders. Under specific conditions, a corrective unit is activated which determines corrective values specific to the cylinders for making the cylinders equal. The open-loop control unit applies the metering signal to the actuators in dependence upon the quantity signal and the corrective values.

Method and arrangement for controlling a self-igniting internal

The invention is directed to a method and an arrangement for controlling the fuel injection in a high-pressure fuel pump. Magnetic valves determine the fuel quantity to be injected into the engine. The magnetic valve is controlled during the pumping phase of the pumping element in such a manner that first a preinjection and then a main injection is carried out. In specific operating conditions, the control apparatus determines the duration of the drive pulses for the magnetic valve at which a preinjection just takes place. With the duration of the drive pulses as a basis, the control apparatus forms compensating signals for the drive pulses which effect preinjection and stores the same.

Method and arrangement for controlling the injection of fuel in an

The invention relates to a method and arrangement for controlling the fuel metered to an engine and especially to a diesel engine. The engine includes a fuel pump drive by a shaft for which injection start and injection end is fixed by a corresponding control of the electromagnetically actuated valve. The drive pulses for pump-delivery start and pump-delivery end are generated in dependence upon the analog signal of an angle sensor.

Method and arrangement for controlling the metering of fuel in an

Arrangement for detecting input signals of a control device in an

For the electronic control system of a Diesel injection system a smoke pulse limitation device is proposed, so that even during dynamic operational conditions the exhaust gas clouding does not exceed unwanted high values and without requiring sensors for the direct or indirect determination of the amount of air aspirated per cylinder stroke. For this purpose there are proposed a delay element for a signal giving the desired amount of fuel as well as a real differentiator in a rpm signal processing branch. Finally, by way of a performance characteristic data storage for the smoke pulse limiter, maximally permissible fuel amount values are determined.

Electronic control system for a diesel injection system of an internal

An electronic control device is proposed for a Diesel fuel metering system, in which at the onset of the starting procedure, a constant fuel quantity is pre-specified at first, and this quantity subsequently increases in steps or in a ramp-like manner. Above a predetermined rpm or starting quantity, an rpm-dependent reduction in quantity takes place, to 90% of the full-load quantity. The open-loop or closed-loop control of the starting quantity ends upon the attainment of a speed of 800 rpm, for example. Both an analog and a computerized realization of the control device are provided, and the control device according to the invention is capable of dispensing with the processing of a temperature signal and can thus dispense with the use of one temperature sensor.

Electronic control device for a fuel metering system of an internal

The invention is directed to a safety arrangement for an internal combustion engine having self-ignition where, in the sense of an overall system monitoring, specific signals relating to the operating conditions of the internal combustion engine are continuously monitored. These signals are indicative, for example, of the position of the throttle pedal, the computed rack-travel nominal or desired value, and the rotational speed. The monitored signals are processed and a corrected rack-travel nominal value is generated by means of a minimum-value selection circuit. The corrected rack-travel nominal value signal generated in this manner is fed to the rack controller of an EDC unit. At the same time, a deviation in rack travel is determined utilizing the corrected rack travel nominal value in combination with an actual-value signal of the rack travel fed back from the rack-travel sensor. The signal indicative of actual rack travel also serves for a comparison with the upper and lower limits of the rack-travel sensor voltage; and, depending on the error condition occurring, either the output stage of the rack controller is de-energized and/or the fuel-injection pump is simultaneously shut off by means of an electrical shutoff valve (ELAB); or, a decision for an emergency operation is made.

Safety arrangement for an internal combustion engine

An electronic regulating device for regulating the rpm of an internal combustion engine having self-ignition in accordance with at least rpm, fuel quantity and accelerator-pedal position is proposed. The device has a PI regulator with feedback, for example, and is characterized in that the regulator itself is controllable in accordance with the respective rpm deviation. This is effected, with a view to the desired stability of operation, even in the presence of very steep characteristic curves, and the control is effected with a limitation of the respective maximum rpm deviation. To this end, one upper and one lower threshold characteristic curve are realized at either side of a static shutoff characteristic curve. These threshold curves are formed in accordance with rpm and accelerator-pedal position, and where there is a discrete regulator structure, in the case of limitation, they determine the voltage over the capacitor of the regulator determining the I component. With a view to the very steep characteristic curves which are desired, a feedback of the regulator output signal is provided, and the feedback component may have a proportional course or may follow a specific function.

Electronic regulating device for rpm regulation in an internal

A device is proposed for drift compensation in fuel metering systems, in which it is not the metered quantity as such which is controlled in closed-loop fashion, but rather only the position of a quantity-determining member. The object of the invention is to maintain or re-obtain the original association between the fuel quantity and the position signal of the quantity-determining member for the purpose of providing a correct indication of the load state existing at a particular time. The drift compensation is intended to be capable of being performed manually, semi-automatically, or automatically, in an additive and/or multiplicative manner. It can furthermore be realized via a preferably rpm-dependent characteristic curve. The various values may be ascertained, for instance, in connection with running-out and running-up tests.

Correction device for a fuel metering system in an internal combustion

A fuel control system for an internal combustion engine with correction for optimum values based on a variety of factors. Characteristic engine data is stored in preferably digital memories with capabilities for interpolation. Upon addressing the engine data fields with input signals related to current operational variables, for example the accelerator pedal position, the control system derives therefrom a nominal air flow rate which is used as the reference value in a control loop that sets the amount of recycled exhaust gas and the fresh air flow. As the actual air flow rate approaches the reference value, the fuel flow is adjusted to insure correct mixtures at all times. In another embodiment, the fuel is supplied on demand but cannot exceed a maximum value except under special override conditions. Several other embodiments and variants are presented.

Method and apparatus for fuel metering in internal combustion engines

A device is proposed for the adjustment of a quantity-metering member of a fuel injection pump in an internal combustion engine with self-ignition, comprising an electric circuit arrangement for a control signal dependent on operating parameters, this signal inffluencing the position of the quantity-metering member via an electromagnetic servo unit wherein the electric circuit arrangement includes at least one series circuit made up of a minimum value selection stage, a maximum value selection stage, and a servo unit controller for the quantity-metering member and the output signals of at least two set-point stages for, in particular, the speed, the smoke limit, equalization, and exhaust gas temperature can be fed to the minimum value selection stage with the maximum value selection stage additionally coupled to a start control stage. In addition to the use of the device as a total controller, i.e., the electric circuit arrangement alone determines the position of the quantity-metering member and no mechanical controller is additionally provided, the device can also be utilized where only a regulated stop for the quantity-metering member, for example a control rod, is present as the control member ('signal mixing'). The purpose of the proposed device is to furnish an electronic speed regulation for idling and for intermediate speeds, beyond the quantity-limiting functions of equalization (limitation of the injection only in dependence on the speed), smoke limit, and exhaust gas temperature limit, in case of a total controller as well as in case of signal mixing with the aid of a controlled servo unit, so that the speed is maintained constant at the preset and/or desired value even in an unstable condition during varying loads, for example, due to the additional connection of auxiliary units.

Apparatus for the adjustment of a quantity-metering member of a fuel

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Tamm, Germany

Fridolin Piwonka