Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1997-01-28
1998-08-04
Ballato, Josie
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
30312215, 303128, 303 226, B60T 1300
Patent
active
057883394
ABSTRACT:
A universal unit controls the brakes of a truck of a rail vehicle. The unit includes a service valve, an emergency valve, a variable load relay valve, a release valve, a local control device, a solenoid driver device and a brake assurance device. The service valve when opened provides a first control pressure. The emergency valve when opened provides a second control pressure. In response the control pressures, the variable valve provides to the brake cylinder a load compensated pressure proportional to air spring pressure. The brakes then apply to the wheels of the truck a force that accounts for the load borne by the rail vehicle. The release valve when opened prevents the variable valve from providing the load compensated pressure. The local control device controls the control pressures according to a brake force command signal and a control pressure feedback signal. The solenoid device operates the valves in response to valve command signals received from the local control device. The brake assurance device operates in a standby mode in which the local control device controls the release and emergency valves via the solenoid device or in an intervention mode in which it does not thereby assuring that the release and emergency valves open. This enables the variable valve to provide the brake cylinder with the load compensated pressure and therefore apply the brakes. The brake assurance device assumes the intervention mode in response to a loss of power or to a predetermined set of conditions.
REFERENCES:
patent: 4453777 (1984-06-01), Newton
patent: 4598953 (1986-07-01), Wood et al.
patent: 5551765 (1996-09-01), Sich
patent: 5572187 (1996-11-01), Williford
patent: 5662389 (1997-09-01), Truglio et al.
Mazur Richard J.
Wood James A.
Ballato Josie
Westinghouse Air Brake Company
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