Method for improved anti-lock braking control for all-wheel drive vehicles having a viscous coupling or a viscous lock
AssigneeRobert Bosch GmbH
InventorsFriedrich Kost, Gerd Busch, Dieter Kunz, Matthias Reichhelm, Ralf Gutmann
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Abstract
A method for controlling a braking system in an all-wheel drive vehicle having a viscous coupling or a viscous lock, wherein a viscous torque acting on a wheel is estimated, the viscous torque is taken into account in estimating a desired braking pressure for the wheel, and the desired braking pressure is applied to the wheel.
Claims20
A method or controlling a braking system in an all-wheel drive vehicle having a viscous coupling or a viscous lock, characterized in that a viscous torque acting on a wheel is estimated, the viscous torque is taken into account in estimating a desired braking pressure for the wheel, and the desired braking pressure is applied to the wheel
- further characterized in that a reduction factor is used in estimating the viscous torque;
- wherein the reduction factor is calculated as a function of a difference between a front axle cardan drive shaft speed and a rear axle cardan drive shaft speed.
A method for controlling a braking system in an all-wheel drive vehicle having a viscous coupling or a viscous lock, characterized in that a viscous torque acting on a wheel is estimated, the viscous torque is taken into account in estimating a desired raking pressure for the wheel, and the desired braking pressure is applied to the wheel;
- further characterized in that a reduction factor is used in estimating the viscous torque;
- wherein the reduction factor is approximately equal to zero when the viscous coupling or viscous lock is functioning poorly.
A method for controlling a braking system in an all-wheel drive vehicle including one of viscous coupling and a viscous lock, comprising the steps of:
- calculating a reduction actor as a function of a difference between a front axle cardan drive shaft speed and a rear axle cardan drive shaft speed;
- estimating a viscous torque acting on a wheel in accordance with the reduction factor;
- estimating a desired braking pressure for the wheel in accordance with the viscous torque;
- and
- applying the desired braking pressure to the wheel.
A method for controlling a braking system in an all-wheel drive vehicle including one of a viscous coupling and a viscous lock, comprising the steps of:
- estimating a viscous torque acting on a wheel in accordance with a reduction factor, the reduction factor a proximately equal to zero when the one of the viscous coupling and the viscous bc is functioning poorly;
- estimating a desired braking pressure for the wheel in accordance with the viscous torque;
- applying the desired braking pressure to the wheel.
Dependencies are inferred from the claim text.