Control system for automatic parking brake of rail vehicle
AssigneeNew York Air Brake Corporation
InventorDerick Call
Life of this patent
Estimating the term…
Abstract
A control valve for an automatic parking brake having an inlet for coupling to a source a brake pipe pressure, an outlet for coupling to a control inlet of the automatic parking brake and a pilot for coupling to the source of brake pipe pressure. The control valve is moveable between a first position where the inlet is in communication with the outlet and a second position where the inlet and the outlet are isolated from each other in response to a predetermined amount of brake pipe pressure at the pilot. The control valve includes a spring biasing the control valve into the first position.
Claims12
A system for controlling an automatic parking brake, comprising:
- a control valve having an inlet for coupling to a source of brake pipe pressure, an outlet for coupling to a control inlet of the automatic parking brake, and a pilot directly coupled to the source of brake pipe pressure, wherein the control valve is moveable between a first position where the inlet is in communication with the outlet and a second position where the inlet and the outlet are isolated from each other in response to a predetermined amount of brake pipe pressure at the pilot;
- and
- a check valve having a cracking pressure and coupled to the source of brake pipe pressure and the automatic parking brake control inlet, wherein the check valve is in parallel with the control valve.
A method of controlling an automatic parking brake, comprising the steps of:
- providing a control valve having an inlet coupled to a source a brake pipe pressure, an outlet coupled to a control inlet of the automatic parking brake and a pilot directly coupled to the source of brake pipe pressure;
- moving the control valve into a first position that isolates the inlet from the outlet when the brake pipe pressure is above a predetermined amount;
- moving the control valve into a second position that coupled the inlet and the outlet when the brake pipe pressure is above the predetermined amount;
- and
- providing a check valve having a cracking pressure between the source of brake pipe pressure and the control inlet of the automatic parking brake, wherein the check valve is in parallel with the control valve.
Dependencies are inferred from the claim text.