| 摘要 |
A brake control apparatus that applies and releases the brakes of a rail vehicle incorporates a penalty brake scheme. The brake apparatus includes a first mechanism for providing a service brake control pressure in accordance with a command for service braking and a second mechanism for providing an emergency brake control pressure in accordance with a command for emergency braking. The brake apparatus also includes a standard check valve for conveying to a standard load valve the higher of the service and emergency control pressures received from the first and second mechanisms. The standard load valve operates the brake apparatus in response to whichever of the control pressures is received from the standard check valve. The penalty brake scheme comprises a penalty check valve and a third mechanism for providing a penalty brake control pressure in response to a command for penalty braking. The penalty check valve connects between the first and third mechanisms and the standard check valve. The penalty check valve conveys the higher of the service and penalty control pressures received from the first and third mechanisms, respectively, to the standard check valve. The standard check valve then conveys to the standard load valve the higher of the emergency control pressure and the service or penalty control pressures received from the second mechanism and the penalty check valve, respectively. The standard load valve operates the brake control apparatus in response to whichever of the control pressures is received from the standard check valve.
|
