Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1985-02-19
1987-06-16
Caldwell, Sr., John W.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303106, 303 97, 303DIG4, 364426, B60T 866
Patent
active
046732268
ABSTRACT:
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.
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Atkins Thomas M.
Every Peter
Miller Roger L.
Tribe Leonard T.
Caldwell Sr. John W.
Kelsey-Hayes Company
Oberley Alvin
Skinkiss Ralph J.
Sobanski Mark J.
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