Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-02-22
2000-11-07
Schwartz, Christopher P.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031134, B60T 844
Patent
active
061425834
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an anti-lock hydraulic automotive brake system.
German patent application 44 25 578 discloses an anti-lock automotive brake system wherein a pneumatic brake force booster which is operable irrespective of the driver's pedal actuation and a master brake cylinder connected downstream of the brake power booster are connected to an ABS hydraulic unit which has a pump and to which the individual wheel brakes of the vehicle wheels are connected. Upon the entry into brake pressure control, the brake force booster is actuated independently of the driver in order to precharge the wheel brakes, and further pressure increase in the wheel brakes is effected by means of the pump upon completion of the precharging operation.
The known brake force booster has a complicated construction and requires corresponding electrical actuating provisions for the actuation of the control part in the brake force booster by independent force.
An object of the present invention is to improve an anti-lock automotive brake system of the type mentioned hereinabove to such end that the pump can be precharged quickly by applying relatively simple means.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved by inserting a hydraulic connection including a multi-way valve between the master brake cylinder and the suction side of the pump and by providing a pressure dampening diaphragm between the multi-way valve and the suction side of the pump.
Further features, advantages and possible applications of the present invention can be seen hereinbelow in the description of an embodiment.
BRIEF DESCRIPTION OF THE DRAWING
The only FIG. 1 shows in a schematic view the circuit-related design of a dual-circuit anti-lock automotive brake system.
DETAILED DESCRIPTION OF THE DRAWING
The brake system includes a pneumatic brake force booster 6 which is operable exclusively in response to driver pedal application. Flanged to booster 6 is a master brake cylinder 8 having pressure chambers to which several wheel brakes HR, HL, VR, VL associated with the vehicle wheels are connected by way of an ABS hydraulic unit 11 including a pump 7. According to the present invention, means 1, 2, 3, 4, 5 are provided which sense the actuation of the brake force booster 6, control the pump 7 and constitute a hydraulic connection between the master brake cylinder 8 and the suction side of the pump 7. The pedal travel or diaphragm travel is registered by a travel sensor 1 to record the actuation of the brake force booster 6. Another means in the hydraulic connection between the master brake cylinder 8 and the suction side of the pump 7 is a multi-way valve 4 closed in its initial position. Valve 4 is inserted in a line branch 12 connected between an inlet valve 3 and the master brake cylinder 8 to the hydraulic connection which leads to the wheel brakes HR, VR, HL, VL. The pressure side of the pump 7 is isolated from the master brake cylinder 8 by the inlet valve 3 in the open position of the multi-way valve 4. Besides, a pressure sensor 2 which senses the pressure in the master brake cylinder 8 in dependence on pedal application is arranged at a pressure port of the master brake cylinder 8. Mounted on the pressure side of the pump 7 is another pressure sensor 5 which is connected along with the pressure sensor 2 on the master brake cylinder 8 to an electronic comparator of an evaluating unit. Thus, the supply pressure or the supply rate of the pump 7 can favorably be influenced as a function of the signals of the two pressure sensors 2, 5 which are evaluated in the comparator. To dampen the pulsation of the pump 7 in the direction of the master brake cylinder 8, a diaphragm 9 and a pressure fluid accumulator 10 are inserted into the hydraulic connection between the multi-way valve 4, that is closed in its inactive position, and the suction side of the pump 7. Further, electromagnetic pressure control valves 17, 18 which connect the wheel brakes HR, HL, VR, VL either to the ma
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Continental Teves AG & Co. OHG
Schwartz Christopher P.
Talavera Melanie
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