DE2231143A1 - SAFETY DRIVE CIRCUIT - Google Patents

Description

BROWN, BOVERI & CIE. AKTIENGESELLSCHAFT _ ^

MANNiIEIM BROWN BOVERI

Mp.no. 570/72 - "Mannheim, June 19, 1972

PAT-H / Bt

2231U3

Safety driving circuit

The invention relates to a safety driving circuit which is dependent on the time and the state of motion of a locomotive and is essentially composed of electronic components, in which a vigilance button must be actuated by the vehicle driver at certain time intervals and, if actuation is not done in time, first by running a first of a chain of three and upon expiration of the second timer, an acoustic signal • is triggered timers an optical signal and a shutdown of the drive and / or emergency braking is effected of the traction vehicle after expiration of the third timer, with a generator driven by a vehicle axle tachometer generator is provided on the second or third time element downstream switching elements acts in such a way that they only switch through when the vehicle is moving after the setting time of the time elements has elapsed.

Such a safety driving circuit is known, for example, from DPS 1 413 557. To reduce * a failure of the safety device as a result of line interruptions between the pulse generator located on the axle bearing and the actual pulse generator In this known device, the control device arranged in the vehicle is designed as a double pulse generator

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and the lines between the double pulse generator and the control device are run twice. If one of the lines mentioned is interrupted, the optical signal lights up in a flashing rhythm on. If both lines are interrupted, the optical signal lights up continuously. The operator is through the optical Signal indicates the presence of a fault. In the event of a fault in the timing elements or in the switching relays in this known arrangement, however, no malfunction display, so that such a malfunction is not noticeable in practical operation and can only be determined when the control device is checked.

It is the object of the invention to increase the operational safety of such a safety driving circuit even further.

This object is achieved in the device described at the outset according to the invention in that a second chain of three timing elements with the same mode of operation as the first-mentioned chain of timing elements this functionally parallel is switched, and a second tachometer generator connected together with two of the additional timing elements is provided, j and that each of the six timing elements is followed by a relay with j positively driven switching contacts, with the j The optical signal is triggered by the parallel switching contacts of the two relays of the first relay group | serve, and to trigger the acoustic signal, the switching contacts j connected in parallel of the two relays of the second Serve relay group and that finally to trigger a solenoid valve for the emergency braking the series-connected Switching contacts of the two relays of the third relay group I are used, and that in the line between the SiFa button and the Entrance of the first time: member group an alternating circuit of

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Changeover contacts are looped into a relay group, whereby the root of a changeover switch is connected to the button, or the root of the changeover contacts of the next relay group or the common connection of the first timing element group, connected is. Each of the two timing relay and relay chains is independent of the other, so that in the event of a fault one of the links in a chain, the second chain is still fully operational is. By using relays with forcibly guided switching contacts, it cannot happen that e.g. a switch contact welded and when changing the switch position this switching contact remains closed while the other contacts open. Stay with the forced operation Welding a single switch contact also the others Switching contacts in the corresponding switching position, even if the position is changed due to de-excitation or excitation of the magnet system.

In a development of the invention it is provided that the three timing elements of a chain are combined to / one device, which contains a frequency divider that counts the pulses generated by a pulse generator and has at least two outputs is provided, at which a voltage is applied briefly at the end of a certain period of time, and of which the first Output is connected to an input of a memory and the second output is connected to an input of a memory and j that the two last-mentioned memories each have an additional one; AND element included, the input of which is connected to a vehicle-j axis-coupled pulse generator is connected, that also an output of the memory with an input of the memory and a Output of the memory is connected to an input of the memory and each of the memories has an output of

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which the first is connected via an amplifier to a first relay, the second via an amplifier to a second relay and the third via an amplifier to a third relay, whereby the outputs of the memory are only switched through when the dominant inputs of this memory are used Impulses have acted, or /. the memories have been brought into the basic position by the reset inputs .

In a special embodiment of the invention it is provided that in each case between the pulse generator and the second inputs of the timing elements a test button with each other galvanically separate, jointly operable changeover contacts is provided through which the aforementioned inputs of the timing elements can be connected to a pulse generator.

In this embodiment, the interposition of memories is necessary, since the frequency divider is only short Pulses occur at the outputs when the response time has elapsed, which are necessary for actuation of the relay for warning or braking not suffice.

The use of two timing element or relay chains results in two fully functional functions capable signal channels. If a relay gets stuck on one of the relays in the event of a fault, the series circuit f direction of the contact groups between the SiFa button and the common input of the two timing element or relay chains Interruption of the cable run, which has the same effect as if the SiFa button was not pressed at all. In this case it is it is not possible to reset the timer to the zero position and the supply line to the Solenoid valve, which triggers an emergency brake. By

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Bridging the switching contact chain between the SiFa button and the other At the input of the two timing element or relay chains, the safety driving circuit can continue to be used with one channel and the vehicle can still be brought to the workshop with an operational safety driving circuit, where it can be rectified of the error that has occurred in a timing element and relay chain.

Further details and advantageous developments of the invention result from the embodiment described below and shown in the drawing. Show it:

Fig. 1 is a circuit diagram of the new safety driving circuit

and
2 shows a section with a chain in a special embodiment.

The safety travel switch is designated by T in the drawing. It has a switching contact that is open when not actuated. Pressing the button is understood as actuation. The timing elements and relays of chain 1 are denoted by 1 in the tens digit and those of chain 2 by 2 in the tens digit. The devices of a group are designated in the single place ^for group 1 with 1 , for group 2 with 2 and 'for group 3 with 3. The associated contacts are each labeled with the suffix 0 for normally open contacts and with the suffix 1 for normally open contacts. A switching contact of the relay 11, which is designed as a normally closed contact, has the designation 11.0. All switching contacts are in the de-energized state of the associated relay or mechanical switches! drawn in the non-pressed state. The timing elements are designated with the reference symbols Z11, Z12, Z13 for the first and with Z21, Z22, Z23 for the second chain and have dynamic inputs. The relays have the reference symbols R11, R12, R13 and R 21, R22 and R 23. Next are H and 24 with

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tacho generators coupled to an axis and with 15 and 25

Called discriminators. These discriminators give in

Standstill of the vehicle as well as in the speed range;

v <5 km / h an L signal, and when driving, that is ν *> 5 km / h \

No signal (O signal) to timing relays Z12 and Z13 or j

Z22 and Z23. The optical signal is marked with O, the acoustic signal with j

Signal with A and the solenoid valve with M. At ent- j

When the magnet is activated, the valve is open. Finally, a test button is designated with j P and a bypass switch with S. '

The new safety driving circuit works as follows:
Before the vehicle can be set in motion, the control voltage must be switched on. All relays R11 to R13 or ' R21 to R23 are then excited and the opening contacts 11.0 j and 21.0 for the visual warning, 12.0 and 22.0 for the acoustic warning are open, while the contacts 13.1 and
23.1 are closed for the excitation of the solenoid valve. The solenoid valve has picked up and the valve for the brake is on
closed. The timers Z11 and Z21 begin to run.
After pressing the T1 key, a current path is established via the
Switching contacts 11.1, 21.1 ...... 23.1 to the inputs of the

Time relays Z11 and Z21. Receive these devices via the dynami- | if inputs see a voltage pulse, they are reset to zero and start running again. A new provision ¹

treatment can only be initiated by an impulse given by the SiFa button T j. After the set delay time has elapsed, which is of course the same for both time elements Z11 and Z21 j (e.g. 60 seconds), the
both relays R11 and R21 de-energized. This closes the switching contacts 11.0 and 21.0 in the warning circuit (right)
and the visual warning switched on. Simultaneously with that
If the relays R11 and R21 drop out, the timing element Z12 or Z22
initiated. After these timers have expired, however, under
the prerequisite that the tacho generators 14 and 24

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via the discriminators 15 and 25 no signal to the time. members 12 bsvr. 22 arrives, relays R12 and R22 ■ are de-energized, whereby contacts 12.0 and 22.0 in the warning circuit \ (right) close and the acoustic warning is set in motion.

At the same time the timing element Z13 or Z23 is set in motion. Here, too, it is necessary that after the setting | time a signal from the tachometer generator 14 or 24 at the time-j member 13 or 23 is pending. In this case, the relays j R13 and R23 are de-energized, so that the switching contacts 13.1 and 23.1 open and the solenoid valve M is de-energized, whereby the valve for the brake line is opened.

The one in the cable between the SiFa button T and the input of the

Timing relays Z11 and Z21 are provided with relay contacts! arranged in a changeover circuit. That means, if the] switching contacts of the relays of a group are in the same position ;, stand, the line is switched through. However, if there is a fault in one of the relays, e.g. due to welding of a switching contact given, the switching contacts of this relay do not go into the new position. If, for example, the relay R22 gets stuck, it remains the switching contact 22.0 is not switched on while the switching contact 12.0 is switched on by the relay R12 tetem state, so that the current path between SiFa button T and the input of the two timing elements Z11 and Z21 of the group 1 is interrupted. Pressing or releasing the SiFä button is then ineffective. The timers switch through that Relays R13 and R23 are de-energized, the switching contacts 13.1 and 23.1 open and the magnet M of the valve drops out, so that automatic braking takes place. With the sealable bypass switch S the series connection of the changeover circuit arranged relay contacts can be bridged and the The safety driving circuit is still functional with one timing element chain. Assuming another bug

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does not occur within a shorter period of time, the vehicle can then still be operated over a greater distance with operational safety Drive on to the relevant workshop for repairs.

With the mentioned test button P it is possible to use the basic position inputs of the timers Z12, Z13 or Z22 and Z23 and thus apply an O signal. This makes it possible

to check the functionality of the safety driving circuit at a standstill.

In the special embodiment shown in FIG According to the invention, a relay 4 with a normally open contact 4 · 1 is interposed between the changeover circuit and the SiFa key T. The normally open contact 4.1 acts on a monoflop M1 (monostable multivibrator). Each time the T key is pressed, the monoflop occurs a pulse block, which brings the counting chain Z1 and the memories S11, S12 and S13 into the basic position via the inputs. The three timing elements are combined here in a counting chain Z1. The second counting chain is not shown. The counting chain is connected to a pulse generator J1 in which square-wave pulses can be generated with a relatively high number per unit of time. The relays R11 to R13 are the first counting chain here memories S11, S12 and S13 are connected upstream, of which the the latter two are combined with an AND element. The entrances the AND elements are marked with a and b, the input of the memory part with c. The entrance ö is opposite the Inputs a and b dominate. The outputs y and ζ are inverse to each other, i.e. if the output y has L, the output ζ has 0 and vice versa. The input a of the memory S11 is connected to the output 60S of the / counting chain Z1, while the inputs a the memories S12 and S13 with the output 1OS of the counting chain Z1

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are connected. After e.g. 60 seconds after setting the counting chain Z1 in the basic position by contacting the T button Via the relay 4 and the monoflop M1, a pulse is sent from the output 60S of the counting chain to the memory S11, as a result of which The relay R11 is de-energized via an amplifier V11 and the visual warning 0 responds. At the same time, the input b of the AND element of the memory S12 receives from the output y of the memory S11 voltage.

After another 10 seconds the input receives a voltage of the storage \ Chers S12. If this via a further input c connected to a memory 18 (as a criterion for the movement of the vehicle at a certain minimum speed); not is held in the basic position will be output not ζ \ conductive and turns off, is de-energized whereby the relay R12 via the amplifier V12 and the acoustic signal for response: is. At the same time, the input b of the memory S13 is connected to voltage from the output y of the memory S12. After j further 10 seconds have elapsed, input a 'receives a pulse from output 1OS of counting chain Z1. If as before with the memory S12 | If voltage is present at input c, relay R15 is de-energized via the amplifier and thus also the solenoid of solenoid j

valve M de-energized, so that a braking process is initiated; The same process takes place in the second chain.

As mentioned, the safety driving circuit with regard to the acoustic warning and the braking device is only effective when the vehicle speed exceeds a certain value (e.g. 5 km / h). To test the functionality, j Tachometer generator 14 and the inputs c of the memories S12 and S13 an amplifier 16, the switching contacts of the test button P, a pulse shaper 19, a counter 17, designed as a frequency divider, and a memory 18 are interposed, whereby an action to the memories S12 and S13 only takes place when a certain Pulse frequency is exceeded, i.e. when the vehicle has exceeded a certain driving speed.

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In the counter 17 is the number of the speedometer '

-κ- 'generator 14 generated and processed in the amplifier · 16 and 19

ridden impulses compared with a certain predetermined value, that of a speed of the vehicle / of about 5 km / h

i corresponds to. This is done by connecting the counter 17 to ■: an output 1S of the counting chain Z1, dt-rch every second; Pulse is transmitted to the counter 17. If, for example, the number of pulses counted in one second is greater than that of one

corresponding to a certain minimum speed of the vehicle, ¹ a memory 18 is set so that the dominant signal disappears at the inputs c of the memory S12 and S13 and the relays R12 and R13 can be de-energized.

The test device for the functional test in the state v / e is not just a test as in the embodiment according to FIG.

button on, sundern one uses here the pulse generator J1 j in connection with the counting chain'Zi, which via a line L1 with; the one changeover contact of the test button P is connected. At standstill of the vehicle can in this way on the managerial i tung L1 and j are given the test button P pulses to the counter 17, whose shape is not pulse of the pulse produced by the import \ differs, which simulates a running of the vehicle j will.

^f pulse shaper

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Claims (2)

Claims Depending on the time and the state of motion of a motor vehicle, a safety driving circuit made up essentially of electronic components, in which a vigilance button must be actuated by the vehicle driver at certain time intervals and, if the driver fails to actuate it in good time, an optical signal and a first of a chain of three timers are triggered After the second time element has elapsed, an acoustic signal is triggered and after the third time element has elapsed, the drive is shut down and / or the locomotive is automatically braked, with a tachometer generator driven by a vehicle axle being provided, the switching elements connected downstream of the second or third time element acts in such a way that these switch through after the setting time of the timers only when the vehicle is moving, characterized in that a second chain of three timers (Z 21, Z 22, Z 23) with the same hen operation as the first-mentioned chain of timing elements this is functionally connected in parallel, and a second tachometer generator (24) connected together with two of the additional timing elements (Z22, Z23) is provided, and that each of the six timing elements (Z 11, Z 21; Z 12, Z 22; Z 13, Z23) a relay (R 11, R 21 ;. R 12, R 22; R 13, R 23) with positively driven switching contacts is connected downstream, whereby the switching contacts (11.0, 21. θ!) of the two relays (R 11, R 21) of the first relay group are used, and the switching contacts (12.0, 22.0) connected in parallel of the two relays (R 12, R22) of the second relay group are used to trigger the acoustic signal and, finally, for Triggering of a solenoid valve (M.) for the emergency braking the series-connected switching contacts (13.1 , 23.1) of the two relays (R 13, R 23) of the third 309883/0175 • - 12 -. 570/72 . " ¹² " 2231 U3 Serve relay group, and that in the line between the SiFa button (T) and the input of the first timing element group (1) a changeover circuit of changeover contacts a relay group (1, 2 or 3) is looped in, whereby the root of a changeover switch with the Button (T) or the root of the changeover contacts of the next relay group or the common connection of the first Timer group (1) is connected. 2. Safety travel switch according to claim 1, characterized in that the three Zeitgldeder a chain to form a device (Z 1 or Z 2) are combined and each contains a frequency divider that counts and pulses generated by a pulse generator (J1 or J2) is provided with at least two outputs (60S or IOS) at which a voltage is applied briefly after a certain period of time, and of which the first output (60S) with one. Input &) of a memory (S 11) and the second output (10S) are each connected to an input (a) of each memory (S 12 or S 13) and that the two last-mentioned memories (S 12 and S 13) each contain an additional and-glieji whose input (c) is connected to a pulse generator coupled to the vehicle axle, that furthermore an output (y) of the memory (S 11) with an input (b) of the memory (S 12) and an output (y) of the memory (S12) is connected to an input (b) of the memory (S 13) and each of the memories (S 11 or S 12 "or S 13) each has an output (z), of which the first (from S 11), via an amplifier (V11) with a first relay (R11), the second (from S12) via an amplifier (V12) with a second relay (R12) and the third (from S13) via an amplifier (V13) is connected to a third relay (R13), the outputs of the memory (S12 or S13) only being switched through when this is done on the dominant inputs (c) he memory impulses have acted or - the memories have been brought into the basic position by the reset inputs (R). "13 _ 309883/0175 570/72 - U - Safety driving circuit according to one of Claims 1 or 2, characterized in that between the tacho j generator (H "or 24) and the second inputs of the time j link (Z12, ZU or Z22, Z23) a test button (P) with j galvanically separated, jointly actuatable switchover contacts are provided, through which the mentioned j Inputs of the timing elements can be connected to a pulse generator. Safety driving circuit according to Claim 3, characterized in that between the inputs (c) of the memories (S12, S22 or S13, S23) and the tachometer generator (14 or 24), a memory (18 or 28), a counter (17 or 27) and a test button (P) with two galvanically separated changeover contacts _p where the root of a changeover contact with the counter (17) and one contact connection with the tachometer amplifier (16 or 26) and the other Eontakt connection with an output (0.1 S] of the counting chain (Z1 or Z2) is connected. 101B83 / 017 &.