Patents by Inventor Alf Loffler

Alf Loffler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5235949
    Abstract: 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.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: August 17, 1993
    Assignee: Robert Bosch GmbH
    Inventors: Josef Wahl, Alf Loffler, Hermann Grieshaber, Wilhelm Polach, Ewald Eblen, Joachim Tauscher, Helmut Laufer, Ulrich Flaig, Johannes Locher, Manfred Birk, Gerhard Engel, Alfred Schmitt, Pierre Lauvin, Fridolin Piwonka, Anton Karle, Hermann Kull
  • Patent number: 5131371
    Abstract: 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.
    Type: Grant
    Filed: September 7, 1990
    Date of Patent: July 21, 1992
    Assignee: Robert Bosch GmbH
    Inventors: Josef Wahl, Alf Loffler, Hermann Grieshaber, Wilhelm Polach, Ewald Eblen, Joachim Tauscher, Helmut Laufer, Ulrich Flaig, Johannes Locher, Manfred Birk, Gerhard Engel, Alfred Schmitt, Pierre Lauvin, Fridolin Piwonka, Anton Karle, Hermann Kull, Werner Zimmermann
  • Patent number: 5070836
    Abstract: 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.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: December 10, 1991
    Assignee: Robert Bosch GmbH
    Inventors: Josef Wahl, Alf Loffler, Hermann Grieshaber, Wilhelm Polach, Ewald Eblen, Joachim Tauscher, Helmut Laufer, Ulrich Flaig, Johannes Locher, Manfred Birk, Gerhard Engel, Alfred Schmitt, Pierre Lauvin, Fridolin Piwonka, Anton Karle, Hermann Kull
  • Patent number: 5063903
    Abstract: 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.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: November 12, 1991
    Assignee: Robert Bosch GmbH
    Inventors: Josef Wahl, Alf Loffler, Hermann Grieshaber, Wilhelm Polach, Ewald Eblen, Joachim Tauscher, Helmut Laufer, Ulrich Flaig, Johannes Locher, Manfred Birk, Gerhard Engel, Alfred Schmitt, Pierre Lauvin, Fridolin Piwonka, Anton Karle, Hermann Kull
  • Patent number: 4993389
    Abstract: A device for the electronically controlled influencing of actuating devices of an internal combustion engine is proposed in which actuating devices can be influenced by comparing differentiated sensor signals with predeterminable threshold values. The actuating devices are directly accessed without a detour via any regulating devices. The system corresponding to the method thus becomes very simple and inexpensive in its construction. Control-loop-related oscillations are avoided by the direct influencing of the actuating device.
    Type: Grant
    Filed: May 8, 1989
    Date of Patent: February 19, 1991
    Assignee: Robert Bosch GmbH
    Inventors: Frank Ahlborn, Wolfgang Duhlmeyer, Volker Schafer, Albrecht Sieber, Rainer Buck, Herbert Kaberer, Alf Loffler