Patent GB-1010089-A (GB)
Title: Vehicle control system
IPC: B61L25/04
Filed: 1963-07-23
Abstract: 1,010,089. Automatic speed control. GENERAL SIGNAL CORPORATION. July 23, 1963 [Sept. 5, 1962], No. 29111/63. Heading G3R. [Also in Division B7] In an arrangement for retro-actively controlling the speed of a train in accordance with speed requirement signals supplied via a truck signalling arrangement (See Divisions B7), means are provided, when a low speed signal is applied to a train or rest, for checking the control apparatus before the train is set in motion. The apparatus includes a generator ADFG supplying an output signal having a frequency proportional to train speed, a number of bi-stable circuits FF5, FF7, &c each normally switched to a first state in which an associated relay 5R, 7R &c is energized, a number of frequency conscious reed relays RR4, RR5, RR6 &c, two of which are associated with each bi-stable circuit, which respectively pick up at a frequency representing a train speed of 4, 5, 6, &c miles per hour and a number of oscillators OSC5-OSC49 which respectively generate signals at frequencies simulating train speeds of 5-49 m.p.h. Assume a low speed requirement signal is received when the train is at rest, relay LSR picks up and at contact 115 resumes positive signal from line 116 whereby the oscillators OSC5-49 are energized and apply their output signals to amplifier AMPL. In addition to picking up motion detection relay MDR, signals from OSC5-47 pick up relays RR5-RR47 to switch the associated bi-stable circuits FF5-FF47 to their second states in which relays 5R-47R are released and OSC 49 energizes relay 49R via high pass filter HPF. As a result a slow to release relay SCR is energized and at contact 128 applies positive voltage to line 116 to switch off the oscillators whereby relay MDR is released and the bi-stable circuits switch back to their first state in which relays 5R, 7R &c are energized. Answer before relay SCR drops away a zero speed check relay OSCR picks up via contact 130, relay LSR, contact 131, relay SCR and contact 129, relay MDR, to provide a bold circuit for itself and for relay SCR at contacts 135 and 133. With the circuit check completed a No. 1 power relay IPR is now energized via contacts of relays LSR, SCR, 5R, 15R and 45R whereby a low speed power signal is applied to control wire CW1 of the train control apparatus. On movement of the train, generator ADFG supplies an output which picks up relay MDR and as the speed increases to 4 mph operates relay RR4 which does not affect operation at this stage. When the speed reaches 5 m.p.h. relay RR5 operates switching bi-stable FF5 to its reared state in which relay 5R releases whereby release of relay IPR switches off the train power. If the train speed now drops to 4 mph relay RR4 picks up and switches the bi - stable back to its first state and power is re-applied to the train. Should the speed increase to 7 mph relay RR7 is energized to switch FF7 to its second state in which release of relay R7 disconnects positive voltage from control wire CW7 to the motor control apparatus whereby the train brakes are applied until the speed drops back to 6 mph when pick up of relay RR6 returns bi-stable FF7 to its first state and the brakes are released. In a similar manner bi-stables FF15 and FF17 control the train speed to a medium value of 15 mph (relay MSR picked up) and bi-stables FF45, FF47 control the speed to a high value of 45 mph (relay HSR picked up).