Control command system for railway vehicles

DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, and in particular to FIG.
1, there is shown a brake command system generally characterized by numeral 10.
In this preferred embodiment, the command system is a continuous excitation brake command system, and the entire normal brake command system and the emergency brake command system take the form of duplex systems, such as the security brake system, is omitted for the purpose of convenience.
In viewing FIG.
1, it will be seen that the brake drum controller has nine (9) rotating cam plates characterized by symbols C11, C12, C21, C22, C31, C32, C41, C42, and C50 which are connected or linked to an appropriate movable handle (not shown).
The rotating cam plates cooperate with nine (9) cam switches, represented by characters S11, S12, S21, S22, S31, S32, S41, S42, and S50.
The cam switches are turned ON or OFF by the cam plates.
The cross-hatched area shown in FIG.
2 is the position where the corresponding cam switch is ON.
The cam plates C11, C21, and C31, and the corresponding cam switches, S11, S21, and S31 comprise the first normal brake command system, while the cam plates C12, C22, and C32, and the corresponding cam switches S12, S22, and S32 comprise the second normal brake command system.
In addition, the cam plate C41 and the cam switch S41 comprise the first emergency brake command system, while cam plate C42 and cam switch S42 comprise the second emergency brake command system.
In addition, cam plate C50 and cam switch S50 form the interlock LOC.
The cam switch S50 is turned ON when it engages the cross-hatched sections to produce a verification signal (1).
During the portions between the cross-hatched areas at the time each command switch is operated by the rotatable handle, the cam switch S50 is turned OFF so that the output is (0).
In viewing FIG.
1, it will be seen that a plurality of the comparators or comparing circuits ER1, ER2, ER3, and ER4 each takes the form of an EXCLUSIVE-OR circuit.
Now when the inputs to a comparator circuit take the form of (0,0) or (1,1), the output is (0), and when the inputs to a given comparator take the form of (1,0) or (0,1), the output is (1)