Zf Friedrichshafen Ag

Martin Vohmann

Ralf Dreibholz

Gerd Frotscher

Joachim Foth

Thomas Schober

Gunther Bauer

A procedure for the control and regulation of a clutch of an automatic stepless transmission for a motor vehicle in which an electronic control device, via a first or second regulation circuit, determines the behavior of the clutch during three driving conditions and wherein a stepless gear ratio change is carried out from a first into a second gear ratio. In accord with the invention, for the control and the regulation of the clutch during the first driving condition, the first regulation circuit is employed, the size of the regulation thereof being equivalent to the actual value of the motor speed of rotation (n_MOT_IST). During the second driving condition, a second regulating circuit is employed, the size of the regulation thereof being equivalent to the actual value of a difference in speeds of rotation (dnK_IST) of the clutch and during the third driving condition, the clutch is subjected to a controlled pressure value dependent upon various value influences.

Method and device for controlling and adjusting a clutch in an infinitely variable automatic gearbox

A process for controlling and regulating a clutch in a stepped load switchable automatic transmission for a motor vehicle where an electronic control device determines the behavior of the clutch during three operating conditions by way of a first or a second control circuit, and that a shift from a first into a second gear ratio stage takes place. In accordance with the invention, the first control circuit is used for controlling and regulating the clutch during the first operating condition, whose controlled variable is equivalent to the actual value of the engine speed (n_MOT_IST). During the second driving condition, a second control circuit is used, whose controlled variable is equivalent to the actual value of a differential rotational speed (dnK_IST) of the clutch, and during the third operating condition, the clutch is impinged with a controlled pressure value dependent upon various influence magnitudes.

Method and device for controlling and adjusting a clutch in an automotive automatic stepped power shift gearbox

A procedure for the control and regulation of a clutch in an automated stepped transmission for a motor vehicle, in which an electronic control device by means of a first or second regulation circuit determines the behavior of the clutch during three driving conditions and that a traction interrupted shifting from a first into a second gear ratio is carried out. In accord with the invention, for the control and the regulation of the clutch during the first driving condition the first regulation circuit is employed, the size of the regulation thereof being equivalent to the actual value of the motor speed of rotation (n_MOT_IST). During the second driving condition, a second regulating circuit is employed, the size of the regulation thereof being equivalent to the actual value of a difference in speeds of rotation (dnK_IST) of the clutch and during the third driving condition, the clutch is subjected to a controlled pressure value dependent upon various value influences.

Method and device for controlling and adjusting a clutch in an automotive automatic stepped gearbox

The invention relates to a method and device for a coupling ( ) in a motor vehicle transmission, the coupling being controlled and regulated during two operational states by way of a first regulating circuit ( ). The regulated quantity corresponds to the actual value of a differential engine speed of the coupling ( ). The first state corresponds to a starting action and the second state to operation with a variable transmission ratio.

Method and device for controlling and regulating a coupling

A method and device for a coupling ( ) in a motor vehicle, transmission ( ) are proposed in which the coupling is controlled and regulated during three operational states via a first regulating circuit ( ). The regulated quantity corresponds to the actual value of a differential rotational speed of the coupling ( ). The first state corresponds to a starting operation, the second state to the operation with constant ratio and the third state exists when a gear shift under load or a change of ratio from a first to a second ratio step of an automatic transmission ( ) is initiated.

A method for controlling an automatic transmission driven by an internal combustion engine is proposed in which a shift from a first to a second transmission ratio occurs as a pull upshift by a first clutch opening and a second clutch closing and electronic transmission control unit controls via electromagnetic valves the pressure curve of the first and of the second clutch during the shifting operation. The shifting operation is divided into different shifting phases, an engine intervention taking place within the gradient-adjustment (GE), the sliding (GL), the gradient-reduction (GA) and the closing (S) phases, an engine torque being reduced by an engine intervention factor (mdzegs) being transferred from the transmission control device to an engine control device of the internal combustion engine.

Method for controlling an automatic transmission

A method for control of a positioning and/or angle control device without an absolute position sensor and the device itself is proposed as having at least one position label for a controllable part in a motor vehicle using an electronic circuit. The positioning and/or angle control device initialized after termination of the operation of the motor vehicle.

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Esslingen, Germany

Martin Vohmann