Robert Boschgmbh

Zf Friedrichshafen Ag

Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Zahnradfabrik Friedrichshafen, Ag.

Gerhard Eschrich

Wolfgang Runge

Wolfgang Danz

Manfred Schwab

Udo Gillich

Achim Schreiber

Willi Seidel

Joseph Petersmann

Alfred Muller

Heinz Stehle

Wolf-Dieter Gruhle

Peter Wendel

Thomas Wehr

Ludwig Hamm

Ronald Schwamm

Thomas Foeldi

Wolfgang Schmid

Joseph Sauer

Kurt Neuffer

Josef Juhasz

Gunther Horsak

Thomas Knapp

Udo Judaschke

Andreas Muller

Jochen Boeckem

A method for terminating a warm-up program of an automatic transmission driven by an internal combustion engine in which the engine operational capacity of the internal combustion engine is calculated and summed (S,, S,, S,) and the warm-up program is abandoned when the summed energy operational capacity (SUM(E)) exceeds a limit value (GW).

Method for controlling an automatic transmission

For an automatic transmission a starter interlock system is proposed in which an electric position switch (,) and a starter switch (,) are located within the transmission. By moving the ignition key from the zero position to the position I, an electronic transmission controls system (,) is activated, which supplies the position switch (,) and the starter switch (,) with current.

Starter interlock system for a motor vehicle with an automatic gear box

Device for controlling the gear ratio of a continuously variable

Desired performance input fuzzy logic control system for automatic

Gear-change control system for an automatic transmission

Control system for changing automatic gears

A traveling speed regulating device for motor vehicle provided with a drive motor and a transmission, has a transmission control for controlling the transmission, an electronic traveling speed regulator providing a nominal travelling speed, an adjusting member acting on the drive motor and changing a moment of the drive motor in dependence on a travelling speed deviation, and a further control means releasable in predetermined marginal conditions and adjusting a traveling speed by acting on the transmission control means of the transmission. The further control is designed so that a traveling speed which is over a nominal value in connection with a position of the control member which changes the moment of the motor in a zero position when the motor applies no power to wheels are provided as the marginal conditions.

Traveling speed regulating device for motor vehicles

In order to adapt the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission continuously to the dirver's driving style or to a just existing or real time traffic situation, the driving speed (v), the lateral acceleration (aq), the longitudinal acceleration (alb), the longitudinal deceleration (alv) and the engine rotational speed (nmot) in addition to the throttle valve position alpha, are detected and by way of characteristic diagrams and a linking function are added to form a parameter from which, by filtering, a driving activity is determined. This driving activity is finally used for the selection of a shifting program from a plurality of shifting programs ranging from a consumption-optimized shifting program (SKF1) to a power-optimized shifting program (SKF5).

Method and apparatus for controlling an automatically shifting

In order to improve the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission particularly during cornering and braking, the driving speed (v), the lateral acceleration (aq), and the time variation of the throttle valve position are sensed in addition to the throttle valve position (alpha) and the engine rotational speed (nmot). From the time variation of the throttle valve position, a signal can be derived for the prevention of an upshifting operation since a motor vehicle driver's foot moves away faster from the accelerator pedal when approaching a bend in the road than would be the case for the normal deceleration of the motor vehicle.

Method and apparatus for controlling an automatic shift transmission

Reference values are stored for various conditions of gear shift operations of a vehicle motor of a particular type and model for various motor speed and load combinations, the reference values having a magnitude characterizing the gear shifting operation, for example the time interval required from the appearance of a gear shift command until the end of slip in a coupling indicates that the gear shift is complete. As the vehicle is driven, actual values of this magnitude are stored and averaged for a predetermined number of shift operations under the same class of condition. Correction values for the pressure of hydraulic fluid of the gear shift control, originally set at zero for all conditions, are determined by comparison of reference values with average actual values and stored. In subsequent driving, the stored correction values are used to control the pressure of the hydraulic medium to maintain a standard of comfort for all shift operations and new average actual values are used from time to time to modify the correction values for compensation of aging effects.

Method of controlling frictionally engageable couplings of an automatic

Method and apparatus for control of gear changing under load in a

To eliminate the effect of hysteresis when electrical energy is supplied to an electromagnetic positioning element, for example to an electromagnetic valve, upon change in sign of the electrical energy which is provided from a previously occurring change, additional electrical energy is supplied if the change in energy is counter the direction of the magnetization curve. The extent of the additional energy may be at least as great as the gap between the ascending and descending branches of the hysteresis curves (H1, H2), or may be a quantity obtained by experience or measurement if the gap between the hysteresis curves is known or determinable. If the electromagnetic energy applied is in excess of that for reversal of magnetization, it may be applied for a period of time which is just long enough to permit remagnetization of a magnetic portion of the electromagnetic apparatus (11) but not long enough to cause change in a mechanical output thereof.

Method and apparatus to convert an electrical value into a mechanical

To effect soft gear change, without shifting jolts or shocks, the output torque of an automotive vehicular internal combustion engine is controlled in dependence on sensing of an overrunning condition signal derived, for example, by the conjunction of the accelerator pedal being in 'idle' or 'unoperated' condition, and the engine operating at a speed in excess of idling speed. Use of such an 'overrunning condition' signal permits ready control of the engine without requiring additional control elements or systems coupled to the gear change apparatus or to the transmission.

Method of controlling engine operation in an automotive vehicle during

The time required for shifting gears from an old to a new gear and the jolt created by the shift is decreased by initiating a known overlap of disengagement of the friction elements of the old gear and engagement of the friction elements of the new gear at the time the hydraulic unit operating the friction elements of the new gear is completely filled. Since a voltage pulse occurs across the solenoid winding of the pressure regulator when the hydraulic unit is completely filled, the solenoid valve is monitored by a threshold circuit which responds to the pulse. The output of the threshold circuit sets a flipflop. The flipflop is reset in response to a gear shift initiation signal furnished by a microprocessor. The microprocessor samples the flipflop output to determine whether the hydraulic unit is completely filled and initiates the overlap portion of the gear shift when this is so.

Gear shift control in motor vehicles with automatic transmissions

Growing community of inventors

Tettnang, Germany

Gerhard Eschrich