Patent GB-1024855-A (GB)
Title: Programme selecting arrangement for road traffic signalling installations
IPC: G08G1/07
Filed: 1962-09-28
Abstract: 1,024,855. Road signals for controlling traffic; counting apparatus. SIEMENS-HALSKE A.G. Sept. 28, 1962 [Sept. 28, 1961], No. 36977/62. Headings G4D and G4Q. A count is made of the vehicles approaching a traffic region, e.g. an intersection, in a predetermined time over each of several approach roads, and at the end of the predetermined time one of a number of traffic programs is selected dependent upon a comparison of the counts in the respective approaches. Fig. 1 shows three approaches Zu<SP>1</SP>, ZU<SP>2</SP>, Zu<SP>3</SP> each comprising two traffic lanes Fal<SP>1</SP>, Fa2<SP>1</SP>, Fal<SP>2</SP>, Fa2<SP>2</SP> etc. Passing vehicles operate road pads BS1<SP>1</SP>, BS2<SP>1</SP> etc. to produce pulses in pulse dividers IH1<SP>1</SP>, IH2<SP>1</SP> etc. which convert the two pulses produced by the front and rear axles of a vehicle into a single vehicle pulse. These vehicle pulses are fed over pulse converters IUI, 1U<SP>2</SP> etc. to respective approach counters ZK<SP>1</SP>, ZK<SP>2</SP>, ZK<SP>3</SP>, the pulse converters IU<SP>1</SP> etc. ensuring that simultaneously occurring vehicle pulses in the associated pulse dividers are fed successively to the respective counters. The counters ZK<SP>1</SP>, ZK<SP>2</SP> operate respective indicators ZA<SP>1</SP>, ZA<SP>2</SP> while counter ZK<SP>3</SP> operates a recorder MS to indicate traffic density. As the count in each counter reaches predetermined values, corresponding selector relays in associated relay networks AW<SP>1</SP>, AW<SP>2</SP>, AW<SP>3</SP> are actuated. The contacts of these relays are so connected in a comparator network Vgl-Sch that they actuate selectively a combination of further selector relays PE dependent on the instantaneous settings of three counters. At the end of the predetermined period which is determined by a timer ZG the operative relay combination selects a corresponding program selector relay. The program selected is rendered effective as the timer zeroizes the counters, the networks AW<SP>1</SP> ... etc. and the comparator Vgl-Sch for the next count. Counter, Fig. 3.-The pulse dividers and the pulse converter for each approach cause a relay Y, Fig. 2 (not shown) to be operated by the first vehicle pulse in each time period and switched off by the next vehicle pulse and so on during the count. The first operation of relay Y energizes counter relay Z1 and a relay E which locks in until transfer. Counter relay Z2 operates and Z1 relapses when Y relapses. The units counter relays Z1 . . . Z10 thus operate in succession and each causes the previously operated units counter relay to relapse. Transfer is effected by a relay Zh10 which is energized when counter relay Z10 pulls up and operates a relay M (M<SP>1</SP>, M<SP>11</SP>) which releases relay E. As E releases counter relay Z10 falls off and a relay N(N<SP>1</SP>, N<SP>11</SP>) is energized. The eleventh vehicle pulse re-operates counter relay Z1  which operates E as before whereupon Zh10 relapses and the first tens counter relay H1 and a relay F are successively operated over e5, n3. Relay F locks in until the end of the count. Relays M, N remain operated until the next transfer when the relay Zh10 again operates and reverses these relays to actuate the second tens counter relay H2. Successive transfers are thus effected by relay Zh10 reversing the relays M, N. Tens counter relays H1 . . . H19 are provided and the whole counter is zeroized by restoration of contacts rul4, ru2 4 , rul 5 , ru2 5 . The counter indicators consist of lamps, Fig. 4 (not shown) operated over contacts of the tens counter relays only and the counter recorder MS, Fig. 1, is operated by a current varied in accordance with the actuated units and tens relays which insert respective resistors in the recorder circuit. The selector relays in the networks AW<SP>1</SP>, AW<SP>2</SP>, AW<SP>3</SP>, Fig. 1, are respectively connected between predetermined contacts of the associated tens counter relays and the units counter relays, Fig. 4 (not shown). They operate as the corresponding count is reached and lock in until the end of the counting period. According to which selector relays are then operated, a combination of further selector relays AB, P1, P2 ... P5, Fig. 5 (not shown) operated thereby selects a corresponding programme selector relay PO, PA, PB . . . PF, Fig. 5 (not shown) which becomes operative as the timer zeroizes the counters and the operated selector relays. The timer, Fig. 6 (not shown) comprises a relay chain stepped by a one second impulser according to a binary code, contacts of the relays being adjustably arranged so that a time interval varying between 2 seconds and 8¢ minutes may be selected.