초록 ▼

A slip-controlled brake system, wherein the brake pedal effort is transmitted power-assisted to a master cylinder (10) to the wheel cylinders through several hydraulic fluid paths which allow shut off independently of one another. The behavior of rotation of the wheels and the vehicle speed are meas

A slip-controlled brake system, wherein the brake pedal effort is transmitted power-assisted to a master cylinder (10) to the wheel cylinders through several hydraulic fluid paths which allow shut off independently of one another. The behavior of rotation of the wheels and the vehicle speed are measured by sensors (S1 to S4), with the signals logically linked and control signals generated from them for electromagnetically actuatable directional control valves (15, 16, 17). In the event of a control action, the power assisted pedal effort (F) directed on the master cylinder (10) is temporarily compensated by an external power action in an opposite direction whereby the pressure increase in the master cylinder (10) is slowed down or decreased.

대표청구항 ▼

A slip-controlled brake system for automotive vehicles having wheels and wheel cylinders, said system being provided with a power assisted, brake pedal-actuated master cylinder (10), with sensors for the determination of the behavior of rotation of the wheels and of the vehicle speed, with valves (1

A slip-controlled brake system for automotive vehicles having wheels and wheel cylinders, said system being provided with a power assisted, brake pedal-actuated master cylinder (10), with sensors for the determination of the behavior of rotation of the wheels and of the vehicle speed, with valves (15, 16, 17) in the hydraulic fluid supply lines (24, 25) connecting the master cylinder (10) to the wheel cylinders and with an electronic switching arrangement (18) for the logical linkage and processing of the sensor signals (S1 to S4) and for the generation of valve control signals, with a power-assisted pedal force (F′) directed on said master cylinder (10) being temporarily compensatable by an external power acting in opposite direction and with the wheel cylinders being connected, within the phase of reduced pressure in said master cylinder (10), to said master cylinder (10) through the said hydraulic fluid supply lines (24,25) or being cut off due to an actuation of the said valves (15, 16, 17) as a function of the instantaneous behavior of rotation of at least one wheel, with a servo unit (1, 38, 46, 56, 71) arranged in accordance with the principle of a vacuum brake power booster being provided for the generation of the auxiliary power and of the oppositely directed external power, said servo unit (1, 38, 46, 56, 71) comprising a vacuum cylinder with a power piston (2, 41, 50, 73, 98) which, in accordance with the pressure differential in the power chambers (3, 4; 34, 35; 68, 69; 75, 76; 53, 54) on either side of said power piston (2, 41, 50, 73), transmits a pressure to a push rod (9) which acts upon a master-cylinder piston (11, 12), the pressure differential in the two said power chambers being controllable with the aid of valves (22, 39, 42, 99, 100) as a function of the brake pedal effort (F), wherein a play (s) is provided between the piston rod (8, 31, 84) coupled to the brake pedal (7), on one side, and the push rod (9) of the said master cylinder (10), on the other side, and wherein said piston rod (8, 31, 84) shifts the said push rod (9) on having overcome said play (s) and with a piston (40, 41, 44) subjected to the atmospheric pressure arranged to act, in reaction to the foot effort (F), on the valve member (8′, 31, 48, 84) of said servo unit (1, 38, 46, 56, 71) controlling the flow of atmospheric air and a valve (27, 36, 55, 72, 96) arranged in said power piston (2, 41, 50, 73) of said servo unit, a valve (27, 36, 55, 72, 96) effecting the pressure balance between said power chambers (3, 4; 34, 35; 53, 54; 68, 69; and 75, 76) on either side of said power piston (2, 41, 50, 73) to control the power (F′) acting on said push rod (9).