Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-04-23
1992-12-15
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031181, 303DIG3, 303DIG4, B60T 800, B60T 832
Patent
active
051710692
ABSTRACT:
An air brake system for a truck includes a treadle valve, a pilot control isolation valve, an exhaust valve, a relay valve, an air pressure transducer, a wheel speed sensor, an electronic control unit (ECU) and an air brake chamber associated with a brake actuator. In heavy braking operations, the pilot system pressure rise rate is monitored and restricted by modulation of the pilot control isolation valve. During heavy braking operations, if braking of the vehicle wheel results in a wheel velocity change which exceeds a predetermined deceleration threshold, the pressure rise rate is further restricted in attempt to "creep" up on the brake system pressure at which the lock condition is expected to occur. At another predetermined deceleration threshold, the brake system pressure is vented. The brake system pressure decreases resulting in a reduction in the applied brake force thereby permitting the vehicle wheel to roll back up to speed. The roll up rate is a function of the friction force. The friction force is used to control parameters of operation of the antilock brake system during subsequent antilock cycles.
REFERENCES:
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patent: 3893696 (1975-07-01), Urban et al.
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patent: 4093316 (1978-06-01), Reinecke
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patent: 4585280 (1986-04-01), Leiber
Murphy Bryan R.
Peck David E.
Butler Douglas C.
Rockwell International Corporation
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