Vacuum brake booster with traction control

Details Vacuum brake booster with traction control Vacuum brake booster with traction control

1994-04-22

1995-02-14

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

188356, 3031143, B60T 832, B60T 844

Patent

active

053888979

ABSTRACT:
A vacuum brake booster (12) for use in a brake system (10) having a traction control function to selectively effect a brake application of driving wheels of a vehicle to synchronize the rotational spin thereof. The vacuum brake booster (12) has movable wall (62) which separates a housing (56) into a front chamber (58) and a rear chamber (60). The front chamber (58) is connected to the rear chamber (60) by a first passage (61), a bore (59) and a second passage (63) in the movable wall (62). A first control valve (66) located in the bore (59) controls communication of a first fluid through the first passage (61) to the bore (59) and a second fluid to create a first pressure differential in the brake booster (12) and produce a first operational output to effect a brake application in an operational mode of operation. The first operational output force is supplied to a master cylinder (14) from which pressurized fluid is supplied to the wheel brakes to effect a brake application for the vehicle. A second control valve (80) responsive to an operational signal from an electronic control unit (34) corresponding to rotational spin 1 of the drive wheels of a vehicle communicates a third fluid to a balloon (88) or piston (150) to initially interrupt communication of the first fluid through the first passage (61) and thereafter initiates communication of the second fluid to the second chamber (80) to create a second pressure differential to develop a second operational output force. The second operational output force is supplied to the master cylinder (14) from which pressurized fluid is selectively communicated to the driving wheels to effect a brake application which synchronizes the rotational spin of the driving wheels.

REFERENCES:
patent: 4630706 (1986-12-01), Takayama et al.
patent: 4778225 (1988-10-01), Rudolph et al.
patent: 4778226 (1988-10-01), Brown
patent: 4819996 (1989-04-01), Belart et al.
patent: 5096267 (1992-03-01), Volz
patent: 5098170 (1992-03-01), Watanabe
patent: 5176433 (1993-01-01), Byrnes et al.
patent: 5312173 (1994-05-01), Rossigno

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