Brake control apparatus for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKazuaki YOSHIDA
Life of this patent
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Abstract
Disclosed is a brake control apparatus which starts ABS control on the basis of slip ratio speed and which reduces a variation in the slip ratio at the time of start of the ABS control. A brake ECU computes a braking stiffness BS** in a linearly increasing region of a μ-S characteristic, and computes a slip ratio speed reference value dSref**/dt by dividing a changing speed dFxc**/dt of braking force of a wheel by the braking stiffness BS**. The brake ECU computes, as a slip ratio speed threshold, a value ((dSref**/dt)+dSn) by adding a slip ratio speed noise offset value dSn to the slip ratio speed reference value dSref**/dt and starts ABS control when the slip ratio speed dSc**/dt of the wheel exceeds the slip ratio speed threshold.
Claims7
A brake control apparatus for a vehicle, comprising:
- slip detection means for detecting slip ratio of a wheel and slip ratio speed which is the rate at which the slip ratio changes;
- ABS control means, operable when the slip ratio speed exceeds a slip ratio speed threshold, for starting ABS control which adjusts braking force of the wheel such that the slip ratio of the wheel follows a target slip ratio;
- and
- slip ratio speed threshold computation means for computing the slip ratio speed threshold on the basis of a changing speed of the braking force of the wheel at the present point in time and a braking stiffness representing the relation between the slip ratio of the wheel and the braking force of the wheel in a state in which the ABS control has not yet been started and the slip ratio of the wheel falls within a predetermined low slip ratio range.
Dependencies are inferred from the claim text.