A VSA device (24), which controls vehicle behavior by individually controlling the pressure of brake fluid supplied from a slave cylinder (23) to a wheel cylinder (16, 17; 20, 23), is provided with: an accumulator (62) which can be connected to the wheel cylinder and the slave cylinder (23); an out-
A VSA device (24), which controls vehicle behavior by individually controlling the pressure of brake fluid supplied from a slave cylinder (23) to a wheel cylinder (16, 17; 20, 23), is provided with: an accumulator (62) which can be connected to the wheel cylinder and the slave cylinder (23); an out-valve (60, 61) disposed on a fluid path between the wheel cylinder and the accumulator (62); a check valve (63) that allows only flow of brake fluid from the accumulator (62) to the slave cylinder (23); and a regulator valve (54) disposed on a fluid path between the wheel cylinder and a path between the check valve (63) and the slave cylinder (23). Brake fluid is discharged from the accumulator (62) to the slave cylinder (23) by reducing the driving force of an electric motor (32) of the slave cylinder (23), thereby rendering a special pump unnecessary and making it possible to reduce the weight, cost, and component count.
대표청구항▼
1. A vehicle brake device including: a brake pedal for receiving a brake pedal stroke;a wheel cylinder provided to a wheel and configured to generate a braking force by using a brake fluid pressure;an electric brake-fluid-pressure generation apparatus for generating a brake fluid pressure to be supp
1. A vehicle brake device including: a brake pedal for receiving a brake pedal stroke;a wheel cylinder provided to a wheel and configured to generate a braking force by using a brake fluid pressure;an electric brake-fluid-pressure generation apparatus for generating a brake fluid pressure to be supplied to the wheel cylinder, by being operated by an electric motor, said electric brake-fluid-pressure generation apparatus operable to carry out a brake-by-wire braking operation under normal operating conditions; anda brake-fluid-pressure control mechanism for controlling vehicle behavior by individually controlling the brake fluid pressure supplied to the wheel cylinder, the brake-fluid-pressure control mechanism being disposed between the electric brake-fluid-pressure generation apparatus and the wheel cylinder,characterized in thatthe brake-fluid-pressure control mechanism is operable to selectively control operation of the electric brake-fluid-pressure generation apparatus based on either a manual operation of the brake pedal, or a supplemental brake assist operation which may be vehicle stability assist or antilock braking assist; andthe brake-fluid-pressure control mechanism includes:an accumulator capable of communicating with the wheel cylinder and the electric brake-fluid-pressure generation apparatus;a first electromagnetic valve configured to switch a communication state of a fluid path that connects the wheel cylinder to the accumulator; anda check valve configured to allow only flowing of a brake fluid from the accumulator to the electric brake-fluid-pressure generation mechanism, and wherein the brake fluid is discharged from the accumulator to the electric brake-fluid-pressure generation apparatus by reducing a driving force of the electric motor of the electric brake-fluid-pressure generation apparatus based on control from the brake-fluid-pressure control mechanism. 2. The vehicle brake device according to claim 1, further comprising a second electromagnetic valve configured to switch a communication state of a fluid path that connects a path between the check valve and the electric brake-fluid-pressure generation apparatus to the wheel cylinder, wherein the brake-fluid-pressure control mechanism maintains the brake-fluid-pressure constant during opening and closing of the first electromagnetic valve and the second electromagnetic valve. 3. The vehicle brake device according to claim 1, wherein the electric brake-fluid-pressure generation apparatus includes a slave cylinder configured to generate a brake fluid pressure by driving a piston by using the electric motor, and controls the brake fluid pressure by changing a position of the piston. 4. The vehicle brake device according to claim 1, wherein the brake-fluid-pressure control mechanism includes: an in-valve disposed between the electric brake-fluid-pressure generation apparatus and the wheel cylinder; and an out-valve disposed between the wheel cylinder and the accumulator, and the electric brake-fluid-pressure generation apparatus reduces the driving force of the electric motor when the in-valve and the out-valve are both closed. 5. The vehicle brake device according to claim 1, wherein the electric brake-fluid-pressure generation apparatus is connected to a plurality of the wheel cylinders, and the vehicle brake device includes a second electromagnetic valve configured to cut the connection between the plurality of wheel cylinders and the electric brake-fluid-pressure generation apparatus when the driving force of the electric motor is reduced. 6. The vehicle brake device according to claim 1, further comprising a determination mechanism for determining discharge of a brake fluid pressure to the electric brake-fluid-pressure generation apparatus. 7. A vehicle brake device including: a brake pedal for receiving a brake pedal stroke;a wheel cylinder provided to a wheel and configured to generate a braking force by using a brake fluid pressure;an electric brake-fluid-pressure generation apparatus for generating a brake fluid pressure to be supplied to the wheel cylinder, by being operated by an electric motor; anda brake-fluid-pressure control mechanism for controlling vehicle behavior by individually controlling the brake fluid pressure supplied to the wheel cylinder, the brake-fluid-pressure control mechanism being disposed between the electric brake-fluid-pressure generation mechanism and the wheel cylinder,characterized in that in normal operation:the brake-fluid-pressure control mechanism is operable to selectively control operation of the electric brake-fluid-pressure generation apparatus either based on a manual operation of the brake pedal or on a supplemental brake assist operation which may be vehicle stability assist or antilock braking assist (ABS);a target brake fluid pressure is selected based on a smaller of the pedal stroke, and a value indicated by the brake-fluid-pressure control mechanism according to a pedal-stroke/fluid-pressure map stored in computer non-volatile memory;a target stroke of the electric brake-fluid-pressure generation apparatus is selected based on the target fluid pressure by using a fluid-pressure/slave-cylinder-stroke map stored in computer non-volatile memory; andthe target stroke is converted to a target rotation angle of the electric motor of the electric brake-fluid-pressure generation apparatus;the electric motor is controlled so as to make the deviation between an actual rotation angle of the electric motor and the target rotation angle converge to zero;such that the fluid pressure corresponding to the brake pedal stroke can be supplied to the wheel cylinders, and it is possible to accurately increase, decrease and maintain the fluid pressure based on the indicated value from the brake-fluid-pressure control mechanism. 8. The vehicle brake device according to claim 7, wherein: the brake-fluid-pressure control mechanism comprises an accumulator capable of communicating with the wheel cylinder, and the electric brake-fluid-pressure generation apparatus; andthe vehicle brake device is configured such that if it determined during an ABS operation the accumulator is full based on the reduction in the recovery amount of the wheel speed at the time of pressure reduction under ABS control, the electric brake-fluid-pressure generation apparatus is operated for a short period of time to discharge a minimum required amount of brake fluid in the accumulator, and then ABS control is performed again.
Umasankar Guruswamy (Sterling Heights MI) Kade Alexander (Grosse Pointe Woods MI) Fabris Alroy G. (Mt. Clemens MI), Cam actuated traction control system apparatus and method.
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