Zf Friedrichshafen Ag

Fev Gmbh

Rheinisch-Westfalische Technische Hochschule (Rwth) Aachen

Peter Janssen

Jakob Andert

Michael Engels

Disclosed is parallel hybrid drive for a motor vehicle, a motor vehicle, a method for operating a parallel hybrid drive in an all-electric mode, a method for operating a parallel hybrid drive in a direct drive mode, and a method for operating a parallel hybrid drive in a CVT mode. The drive for a motor vehicle includes an electric machine operable as a motor and generator, an internal combustion engine, a drive axle, and an epicyclic gear. The epicyclic gear includes: a first shaft connected to the electric machine; a second shaft connected to the internal combustion engine; and a third shaft connected to the drive axle. A clutch element is configured to firmly connect at least two shafts of the epicyclic gear to each other. A first brake element is configured to prevent rotation of the internal combustion engine in one direction of rotation.

Parallel hybrid drive for a motor vehicle, motor vehicle, and method for operating a parallel hybrid drive

A drive system with an 8-gear gearbox for a motor vehicle with a driving machine, more particularly an internal combustion engine, comprising a distribution gearboxwhich is drivingly connected to the driving machineand comprises three members, as well as two 2-gear partial gearboxes, wherein a first member of the distribution gearboxis drivingly connected to the internal combustion engineand the two other members of the distribution gearboxare each connected to an input shaftof one of the two 2-gear partial gear-boxesand wherein, between two members of the distribution gearbox, there is provided a switchable bridging couplingand wherein one output element of each of the two 2-gear partial gearboxesis permanently drivingly connected to a driven gearor to a driven shaft

Drive system with an 8-gear gearbox

A procedure for the control of ratio-change occurrences of an automatic transmission in a motor vehicle, which vehicle possesses a hydraulic system with at least two hydraulic pressure branches () with different hydraulic pressures, wherein in a first hydraulic pressure branch () controllable pressure reducing valves () can be found, by which the hydraulic users (S, S) can be supplied with an activation pressure, wherein in the first hydraulic pressure branch (), a pressure regulation valve () is placed, the exit port of which is connected to a line of the second hydraulic pressure branch (), and wherein by the activation of the pressure regulation valve () the pressure in the first hydraulic circuit () is adjustable, and whereby in the first hydraulic pressure branch () a hydraulic pressure is provided, which represents the highest, necessary operational pressure of the hydraulic users (S, S) plus an offset pressure. Further, provision is made that in certain operational conditions of the motor vehicle, one of the pressure reducing valves () of, respectively, one of the two ratio-changing organs (S, S) remains fully open and the offset-pressure becomes reduced to the value of zero, or to nearly zero, and upon the removal of said certain operational condition the off-set pressure is once again increased and the pressure reducing valve () resumes its function of pressure reduction.

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Maasbracht, Netherlands

Peter Janssen