초록 ▼

In accordance with the present invention, a normally open isolation valve is connected between a master cylinder and the selected wheel brakes, and a normally closed dump valve is connected between the selected wheel brakes and a fluid accumulator. A computer control module is connected to operate t

In accordance with the present invention, a normally open isolation valve is connected between a master cylinder and the selected wheel brakes, and a normally closed dump valve is connected between the selected wheel brakes and a fluid accumulator. A computer control module is connected to operate the isolation valve and the dump valve. In operation, when a slip condition of the controlled wheels is detected, the computer control module closes the isolation valve to hold fluid pressure to the controlled brakes at a relatively constant level. If the deceleration of the controlled wheels exceeds a predetermined amount, the computer control module will selectively open the dump valve to enable fluid to flow into the accumulator, thereby reducing the deceleration of the associated wheels. After the isolation valve has been closed and the slip condition is corrected, the computer control module can detect when the vehicle travels from a low friction surface such as wet asphalt to a high friction surface such as a dry concrete, because the braked wheels of the vehicle which are not controlled by the skid control system will cause an increase in deceleration of the vehicle. Under these conditions, pressure to the controlled wheel brakes can generally be increased without causing a lock-up condition. The control module is responsive to an increase in wheel deceleration above a predetermined rate to selectively open the isolation valve after the valve has been closed to gradually increase pressure to the controlled wheel brakes.

대표청구항 ▼

A method of braking at least one wheel of a multi-wheeled vehicle having means for supplying pressurized brake fluid to actuate a selected wheel brake, said method comprising the steps of: (a) supplying brake fluid at an increasing pressure to actuate the selected wheel brake and decelerate the asso

A method of braking at least one wheel of a multi-wheeled vehicle having means for supplying pressurized brake fluid to actuate a selected wheel brake, said method comprising the steps of: (a) supplying brake fluid at an increasing pressure to actuate the selected wheel brake and decelerate the associated wheel; (b) holding fluid pressure to the selected wheel brake at a relatively constant level after a wheel lock-up condition of the associated wheel is detected; (c) subseqent to step (b), selectively reducing fluid pressure to the selected wheel brake to correct the wheel lock-up condition; and (d) subseqent to step (c), selectively increasing fluid pressure to the selected wheel brake when the rate of change of deceleration of the associated wheel increases by a first predetermined amount.