Interrelated power delivery controls – including engine control – Transmission control – With clutch control
Patent
1998-04-21
1999-11-23
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
With clutch control
477 84, B60K 2300
Patent
active
059891530
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for controlling a torque transmitting system in the power train of a motor vehicle with an engine, a torque transmitting system and a transmission, with an actuating unit, such as an actuator, which is controllable by a control unit to actuate, such as engage and/or disengage, the torque transmitting system or for the selection of the torque which can be transmitted by the torque transmitting system, and with a control unit which is in signal transmitting communication with sensors and, if necessary, other electronic units.
Such apparatus became known from DE-OS 40 11 850, DE-OS 44 26 260 and DE-OS 195 04 847. Motor vehicles which are equipped with such apparatus normally comprise a combustion engine or another driving unit; for example, one can provide a hybrid system with a combustion engine and an energy storing device and/or an electric motor. The torque transmitting system which is disposed in the power train to establish a driving connection can be controlled in an automated manner by means of an actuator, such as an actuating unit in order to be engaged and/or disengaged. The transmission can be a manually operable gear shift transmission or an automated transmission with automatically controlled gear shift. The transmission can operate with or without interruption of pulling force.
OBJECTS OF THE INVENTION
An object of the present invention is to provide an apparatus of the above outlined character and a method which permit a comfortable driving, such as starting, creeping or shunting of the vehicle and establish a comfortable transition between various possible operating conditions. Furthermore, there is to be provided an apparatus which can be produced at a reasonable cost while at the same time exhibiting the required comfort characteristics as concerns the operation of the vehicle in actual use.
Another object of the invention is to provide an apparatus which constitutes an improvement over conventional apparatus and at the same time ensures a reduction of wear and a higher reliability in actual use.
SUMMARY OF THE INVENTION
In accordance with the inventive concept, this is accomplished in that the control unit initiates a creeping movement while the transmission is in gear, the brakes are not applied and the load lever is not actuated in that the control unit ascertains and selects a clutch torque in accordance with at least one preselectable function to thus cause the vehicle to perform a creeping movement. When the transmission is in gear and the brakes are not applied but the load lever is actuated, the control unit initiates a starting movement in that the then applied clutch torque is ascertained in accordance with at least one preselectable function so that the vehicle is started.
In the following passages of this specification, the term clutch torque will denote that torque which can be transmitted by the clutch and is determined by the control unit to be set in a controlled or regulated manner, for example, by an actuator or an actuating unit.
For example, a creeping operation can be defined in that, when the transmission is in gear, the engine is running and the brakes are not applied, the vehicle is caused to move at least slowly while the driving torque which is then being transmitted is small and the operation of the engine is basically an idling operation while the torque transmitting system is engaged at least to such an extent that it is possible to transmit a relatively small torque. A starting operation is an operation which takes place while the load lever, such as a gas pedal or a master cylinder, is actuated, while the engine operates at an RPM which is higher than the idling RPM and the clutch is at least partially engaged to ensure that the vehicle is set in motion at least at a low speed. The difference between the operations denoted as starting and creeping is primarily in the extent of intentional actuation of the gas pedal by the operator of the motor vehicle.
The preselectable functions for cree
REFERENCES:
patent: 4618043 (1986-10-01), Hattori et al.
patent: 5176234 (1993-01-01), Reik et al.
patent: 5632706 (1997-05-01), Kremmling et al.
Amendt Oliver
Fischer Robert
Reuschel Michael
LuK Getriebe-Systeme GmbH
Wright Dirk
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