Control system for variable torque distribution for a four-wheel-drive vehicle
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorKurt Meier
Life of this patent
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Abstract
A control system for variable torque distribution for a four-wheel-drive vehicle with a system for brake control that is possible because of wheel-selective brake intervention wherein a non-variable longitudinal lock with specified torque distribution ratio is provided. If no slip is present, a symmetrical braking intervention is made at the wheels of the axle whose torque transmission percentage will be reduced in comparison to the other axle by changing the torque distribution ratio between the wheels of the rear axle and the wheels of the front axle.
Claims8
A variable torque distribution control system for a four-wheel drive vehicle with a brake control system having wheel-selective brake intervention, said control system comprising;
- a longitudinal lock having a predetermined specified torque distribution ratio;
- means for providing a symmetrical braking intervention at a first set of wheels of a first axle when substantially no slip is present at said first set of wheels wherein a torque transmission percentage of said first axle is less than a torque transmission percentage of a second axle in order to modify a torque distribution ratio between a second set of wheels of said second axle and said first set of wheels of said first axle.
A variable torque distribution system for a four-wheel drive vehicle, said system comprising:
- a non-variable longitudinal lock having a specified torque distribution ratio;
- a symmetrically braking control providing, when substantially no slip is present at a first set of wheels of a first axle a symmetrically braking intervention at said first set of wheels of said first axle whereby the torque transmission percentage of the first axle is reduced in comparison to the torque transmission percentage of a second axle whereby the torque distribution ratio between a second set of wheels of the second axle and the first set of wheels of the first axle is modified.
Dependencies are inferred from the claim text.