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AssigneeDr. h.c.F. Ing. Porsche AG
InventorsNorbert Stelter, Rainer Wuest
Estimating the term…
An arrangement for the control of the force-transmission of a four-wheel drive vehicle in which a main driving axle is driven directly by an internal combustion engine by way of a clutch transmission unit and an auxiliary driving axle is driven by the internal combustion engine by way of a continuously controllable longitudinal clutch. A desired traction force of all wheels is determined from a desired power output and from a velocity of the vehicle, from which a control magnitude for the control of the longitudinal clutch is obtained by a distribution factor dependent on operating or driving parameters. The longitudinal clutch can additionally be controlled either alone or advantageously also in combination with this control magnitude by a further control magnitude which is determined by a square of a rotational speed difference at the longitudinal clutch, having a weighting dependent on operating or driving parameters. The driving behavior achieved therewith enables a good steerability of the vehicle with maximum driving safety and traction.
A system for the control of the force transmission onto axle means of a four-wheel drive motor vehicle, comprising:
A system for the control of the force transmission onto the axle means of a four-wheel drive motor vehicle, comprising a main driving axle means provided with a cross differential means, an auxiliary driving axle means driven by way of a longitudinal clutch means continuously controllable by an adjusting means, a control apparatus which receives input signals from an engine rotational speed measuring means, from at least one of a drive pedal pick-up means, throttle valve angle pick-up means, charging air pressure pick-up means, charging air temperature pick-up means and pick-up means corresponding to velocities of wheels at said auxiliary driving axle means, said control apparatus including means for determining a driving velocity from input signals received by at least one of said pick-up means, said control apparatus including means for producing a control signal for controlling the adjusting means of the longitudinal clutch means in such a manner that it is in a first functional relationship with a traction force of at least one of the wheels at the auxiliary driving axle means, the traction force of the wheels at the auxiliary driving axle means being determined by multiplication of an amount of a desired traction force of all wheels with a distribution factor, said amount of a desired traction force of all wheels being determined from at least two of said input signals and said driving velocity by way of a second functional relationship, and said distribution factor being determined from the amount of the desired traction force of all wheels and from at least one of the input signals by way of a first performance graph means.
Dependencies are inferred from the claim text.