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US 7,775,609 B2Granted
Brake control apparatus and method for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakayuki Yamamoto
Life of this patent
Estimating the term…
Abstract
A brake control apparatus for a vehicle includes an actuator and a controller that controls the wheel cylinder pressure to a target hydraulic pressure by driving the actuator in response to a braking request. The controller sets a ceiling value for the rate at which the wheel cylinder pressure is changed in accordance with a temperature, and the wheel cylinder pressure is changed at a rate that is equal to or lower than the ceiling value.
Claims14
A brake control apparatus, comprising:
- an actuator that changes a wheel cylinder pressure;
- and
- a controller that controls the wheel cylinder pressure to a target hydraulic pressure by driving the actuator in response to a braking request, the controller setting a ceiling maximum value of a pressure change rate,
- wherein the pressure change rate indicates a change in the wheel cylinder pressure per unit time, in accordance with a temperature, and the controller changes the wheel cylinder pressure at a pressure change rate that is equal to or lower than the ceiling maximum value to reduce self-excited vibrations,
- wherein the controller increases the ceiling maximum value as the temperature decreases, and
- wherein the controller decreases the wheel cylinder pressure at a pressure change rate that is equal to or lower than the ceiling maximum value, and when an initial wheel cylinder pressure at a beginning of a pressure decrease is equal to or greater than a predetermined pressure, the controller sets the ceiling maximum value of the pressure change rate smaller than when the initial wheel cylinder pressure at the beginning of the pressure decrease is smaller than the predetermined pressure.
3 more elements
A brake control method for a vehicle, comprising:
- determining a temperature;
- setting a ceiling maximum value of a pressure change rate, which indicates a change in a wheel cylinder pressure per unit time, in accordance with the temperature;
- and
- changing the wheel cylinder pressure at a pressure change rate that is equal to or lower than the ceiling maximum value to reduce self-excited vibrations,
- wherein the ceiling maximum value is increased as the temperature decreases, and
- wherein the wheel cylinder pressure is decreased at a pressure change rate that is equal to or lower than the ceiling maximum value, and when an initial wheel cylinder pressure at a beginning of a pressure decrease is equal to or greater than a predetermined pressure, the ceiling maximum value of the pressure change rate is set smaller than when the initial wheel cylinder pressure at the beginning of the pressure decrease is smaller than the predetermined pressure.
3 more elements
Dependencies are inferred from the claim text.