A door safety interlock circuit that can automatically provide redundant power supply in case of failure.

Abstract

This invention discloses a door safety interlock circuit capable of automatic redundant power supply in case of faults. It includes a near-end control circuit and a far-end control circuit. The near-end control circuit includes a self-resetting time-delay relay CLCBR, a circuit breaker CLCB, a self-resetting circuit breaker CLCBRCB, a redundant circuit breaker CLCB_1, relays DIR1 and DIR2, a door isolating switch LOS, several activation relays COR1, and several door controllers EDCU. Upon detecting a tripped far-end circuit breaker, this invention can achieve automatic redundant power supply through a novel control circuit. This avoids the driver operating a bypass switch and causing speed limits that would lead to passenger disembarkation, allowing the vehicle to return to its destination. It effectively prevents significant operational disruptions caused by occasional short circuits or overcurrent faults in the door interlock circuit that could result in passenger disembarkation.

Description

Technical Field

[0001] This invention relates to the field of electrical control circuit design for rail transit vehicles, and more specifically, to a door safety interlock circuit that can automatically provide redundant power supply in case of a fault. Background Technology

[0002] The door interlocking control circuit is a safety control circuit for urban rail transit vehicles. It mainly connects all the limit switches for the door closing position and door locking position of the entire train doors in series. The relays at this end of the door safety interlocking control circuit are all powered by the remote circuit breaker. As urban rail transit in China has developed to this point, at most, parallel redundancy has been added to the control circuit contacts, and the rest has remained almost unchanged.

[0003] The door safety interlock control circuit is a key circuit in the vehicle's electrical control. Signal control and traction trains both use the safety interlock control relay contacts as safety signal inputs. When the door safety interlock circuit fails, the vehicle will trigger the maximum service braking in automatic driving mode, affecting vehicle operation. During the start-up phase, if the door safety interlock control circuit fails, the train cannot establish a traction permission signal, and the vehicle cannot start. Therefore, the redundancy of the door safety interlock control circuit in failure conditions is related to the reliability of vehicle operation.

[0004] Currently, existing door interlock control circuits, such as Figure 3 As shown: All door limit switches and lock limit switches on one side of the train are connected in series in the door safety interlock circuit. To prevent a single door limit switch contact failure from affecting the operation of the door safety interlock control circuit, each door is equipped with an independent door isolating switch. When a single door failure occurs, the faulty contact can be bypassed through the door isolating switch, allowing the door circuit to be re-established. This safety interlock control circuit is powered by the remote driver's cab CLCB_B. After the control circuit is established, it will power the door safety interlock relays DIR_B1 and DIR_B2 in the driver's cab at this end.

[0005] However, with the existing door safety interlock control circuit technology, if an occasional overcurrent fault in the door safety interlock circuit causes the remote circuit breaker to trip, the driver cannot promptly and effectively reset the circuit breaker in the remote driver's cab because the driver in the current cab cannot do so in time. This will cause the vehicle to lose the door safety interlock circuit. The door interlock relay is a safety control relay and is a necessary condition for vehicle traction. In order for the vehicle to continue traction, the driver needs to open the "door safety interlock circuit bypass switch". After operating the bypass switch, the train will run at a speed limited to 30-60 km / h. In order not to affect the train's timetable, the train needs to clear passengers at the nearest station.

[0006] There are currently no effective solutions to the problems in the relevant technologies. Summary of the Invention

[0007] To address the problems in related technologies, this invention proposes a door safety interlock circuit that can automatically provide redundant power supply in case of a fault, in order to avoid significant operational disruptions caused by occasional short circuits or overcurrent faults in the door interlock circuit when passengers are being evacuated from the vehicle.

[0008] Therefore, the specific technical solution adopted by the present invention is as follows:

[0009] A door safety interlock circuit that can automatically redundantly supply power in case of failure includes a near-end control circuit and a far-end control circuit connected to each other. The near-end control circuit and the far-end control circuit have the same structure. The near-end control circuit includes a self-resetting time delay relay CLCBR, a circuit breaker CLCB, a self-resetting circuit breaker CLCBRCB, a redundant circuit breaker CLCB_1, a relay DIR1, a relay DIR2, a door isolating switch LOS, a number of activation relays COR1, and a number of door controllers EDCU.

[0010] Among them, the self-resetting time delay relay CLCBR is connected in series with the auxiliary contact of the circuit breaker CLCB and the self-resetting circuit breaker CLCBRCB, and then connected in parallel with the power supply. The relay DIR1 is connected in series with several activation relays COR1 and the circuit breaker CLCB, and then connected in parallel with the power supply. The relay DIR1 is also connected in parallel with the relay DIR2. The redundant circuit breaker CLCB_1 is connected in series with the auxiliary contact of the self-resetting time delay relay CLCBR in the remote control circuit, and then connected in parallel with the circuit breaker CLCB. The auxiliary contact of the self-resetting time delay relay CLCBR is connected in series with the redundant circuit breaker CLCB_1 in the remote control circuit, and then connected in parallel with the circuit breaker CLCB in the remote control circuit. Several door controllers EDCU are connected in series and then connected in parallel with the activation relay COR1. A door isolating switch LOS is connected in parallel between the two ends of the door controller EDCU. The door controller EDCU is composed of a door closed limit switch DLS1 and a door locked limit switch DLS2 connected in series.

[0011] Furthermore, the redundant circuit breaker CLCB_1 in the near-end control circuit and the normally open contact of the self-resetting time delay relay CLCBR in the far-end control circuit are connected in series and then connected in parallel with the circuit breaker CLCB in the near-end control circuit for power supply, and together provide circuit breaker protection for the door interlock control circuit.

[0012] Furthermore, the door interlock control circuit can automatically restore control in the event of an intermittent fault. Intermittent faults include overcurrent faults or short-circuit faults. The automatic restoration of control in the event of an intermittent fault includes the following steps:

[0013] When the circuit breaker CLCB in the remote driver's cab trips, DC110V supplies power to the self-resetting time-delay relay CLCBR through the self-resetting circuit breaker CLCBRCB. After 10 seconds, the normally open contact of the self-resetting time-delay relay CLCBR closes, causing the current redundant circuit breaker CLCB_1 in the driver's cab to automatically take over the circuit breaker protection function of the door interlock train control circuit after a delay.

[0014] Furthermore, the door-closed limit switch DLS1 is used to output an indication of whether the door is closed completely, and the door-locked limit switch DLS2 is used to output an indication of whether the door is locked completely.

[0015] Furthermore, the door controller EDCU and the door disconnect switch LOS connected in parallel at both ends form a door unit, and the closed and locked contacts of all door units on the same side are connected in series to form a safety interlocking train line.

[0016] Furthermore, the door disconnect switch LOS is used to bypass the contacts of the door closed limit switch DLS1 and the door lock limit switch DLS2 of this unit after the door unit is released.

[0017] The beneficial effects of this invention are as follows:

[0018] 1) By designing a brand-new door safety interlock control circuit, when an occasional short circuit or overcurrent fault occurs in the door interlock circuit, the circuit of this invention can detect the tripping of the remote circuit breaker and automatically achieve redundant power supply through the new control circuit. This avoids the driver operating the bypass switch to limit the speed and cause passengers to be emptied, and allows the vehicle to run to the destination and return to the depot. It can effectively avoid the significant operational impact caused by passengers being emptied due to occasional short circuits or overcurrent faults in the door interlock circuit.

[0019] 2) This invention effectively improves the fault redundancy of the door safety interlock circuit and enhances operational reliability. This is especially important for first-tier cities with many subway lines, where each passenger evacuation and rescue operation impacts annual operational targets. These targets are related to economic indicators, and subway companies assess vehicle manufacturers based on contract requirements, resulting in economic losses for manufacturers. This invention can alleviate the operational pressure on subway companies and eliminate passenger evacuation failures caused by occasional electrical faults in the door safety interlock circuit to a certain extent, bringing considerable economic benefits annually. Furthermore, it improves vehicle availability. This invention can be widely applied in all rail transit vehicle projects. Attached Figure Description

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is one of the circuit diagrams of a door safety interlock circuit that can automatically and redundantly supply power in the event of a fault, according to an embodiment of the present invention;

[0022] Figure 2 This is a second circuit diagram of a door safety interlock circuit that can automatically and redundantly supply power in the event of a fault, according to an embodiment of the present invention.

[0023] Figure 3 This is a circuit diagram of a door interlock control circuit in the existing technology. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] According to an embodiment of the present invention, a door safety interlock circuit that can automatically provide redundant power supply in the event of a fault is provided.

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-Figure 2 As shown, the door safety interlock circuit that can automatically redundantly supply power in case of failure according to an embodiment of the present invention includes a near-end control circuit and a far-end control circuit connected to each other, and the near-end control circuit and the far-end control circuit have the same structure. The near-end control circuit includes a self-resetting time delay relay CLCBR, a circuit breaker CLCB, a self-resetting circuit breaker CLCBRCB, a redundant circuit breaker CLCB_1, a relay DIR1, a relay DIR2, a door isolating switch LOS, a plurality of activation relays COR1 and a plurality of door controllers EDCU;

[0027] Among them, the auxiliary contacts of the self-resetting time delay relay CLCBR and the circuit breaker CLCB are connected in series and then connected in parallel with the power supply. The relay DIR1 is connected in series with several activation relays COR1 and the circuit breaker CLCB and then connected in parallel with the power supply. The relay DIR1 is also connected in parallel with the relay DIR2.

[0028] The redundant circuit breaker CLCB_1 is connected in series with the auxiliary contact of the self-resetting time delay relay CLCBR in the remote control circuit, and then connected in parallel with the circuit breaker CLCB. The auxiliary contact of the self-resetting time delay relay CLCBR is connected in series with the redundant circuit breaker CLCB_1 in the remote control circuit, and then connected in parallel with the circuit breaker CLCB in the remote control circuit.

[0029] Several door controllers EDCUs are connected in series and then connected in parallel with the activation relay COR1. A door isolation switch LOS is connected in parallel between the two ends of the door controller EDCU. The door controller EDCU is composed of a door closed limit switch DLS1 and a door locked limit switch DLS2 connected in series.

[0030] In one embodiment, the door controller EDCU and the door disconnect switch LOS connected in parallel at both ends constitute a door unit. The door closed position limit switch DLS1 is used to output an indication of whether the door is closed in place, and the door locked position limit switch DLS2 is used to output an indication of whether the door is locked in place.

[0031] In one embodiment, the normal logic for the door safety interlock control is as follows:

[0032] Each door unit outputs a status contact (DLS1) indicating whether the door is fully closed and a contact (DLS2) indicating whether the door is fully locked. Connecting the closed / locked and locked contacts of all door units on the same side in series forms a safety interlocking train line. If the driver's cab at the near end is activated, the near-end activation relay COR1 is activated, while the remote activation relay COR1 is not activated. The safety interlocking loop establishment process is as follows: 110V control voltage of the remote TC car → normally closed contact of the remote CO1 → safety interlocking train line → normally open contact of the near-end CO1 → finally driving the near-end door safety interlocking relays DIR1 and DIR2, thus forming the entire side door safety interlocking circuit. Furthermore, if a door unit is deactivated, the door isolating switch LOS will bypass the contacts of the door closed / locked limit switches DLS1 and DLS2 of that unit.

[0033] Both the traction system and the ATC system can issue traction commands. Towing is not allowed until the doors are properly closed. Therefore, closing all doors and sending contact information to them can improve the safety of vehicle operation.

[0034] In one embodiment, the door interlock control circuit can automatically restore control in the event of an intermittent failure.

[0035] Specifically, the automatic recovery control logic for intermittent faults in the door safety interlock circuit is as follows:

[0036] The remote TC car is equipped with a power-on delay relay (self-resetting delay relay CLCBR). The normally open contact of the CLCBR relay is connected in series with the local redundant circuit breaker CLCB_1 and then in parallel with the local CLCB to provide power, jointly protecting the door interlocking control circuit. When an intermittent overcurrent or short-circuit fault occurs in the door interlocking control circuit, the circuit breaker CLCB in the remote driver's cab trips. DC110V is supplied to the self-resetting delay relay CLCBR through the self-resetting circuit breaker CLCBRCB. After 10 seconds, the normally open contact of the self-resetting delay relay CLCBR closes, causing the current driver's cab redundant circuit breaker CLCB_1 to automatically take over the circuit breaker protection function of the door interlocking control circuit after a delay. No manual operation by the driver is required.

[0037] If the CLCB_1 at the near end automatically takes over the circuit breaker protection function of the door interlock train control circuit, and then experiences another intermittent fault trip, since CLCB_1 is located at the operating end, it still has the function of being manually reset by personnel at the operating end. Through this function, even in the event of the aforementioned fault, the vehicle does not need to activate the bypass switch to continue operating, avoiding passenger disembarkation failures and reducing the impact on vehicle operation.

[0038] In one embodiment, it also includes a portion demonstrating that the invention, after implementation, can fully meet the requirements of redundant power supply control for intermittent faults in the door safety interlock control circuit, specifically as follows:

[0039] After the vehicle is activated, raise both pantographs. Assuming all systems are functioning normally, two certified electricians can verify the implementation of this invention using only a multimeter, without the need for additional specialized tools. The operating steps are as follows:

[0040] Step 1: One operator in the current driver's cab and another operator in the remote driver's cab check and confirm that all circuit breaks in the vehicle are closed.

[0041] Step 2: The electrician in the current driver's cab wakes up the vehicle and activates the current driver's cab using the driver's control key. The voltage of the driver's cab activation relay COR1 is measured with a multimeter, and it is confirmed that the voltage across the relay is greater than DC77V, indicating that it is in the activated state.

[0042] Step 3: The electrician in the driver's cab operates the door closing button on the driver's control panel to confirm that all doors (including the driver's cab side door) are closed.

[0043] Step 4: The electrician in the driver's cab uses a multimeter to measure the voltage of the DIR1 and DIR2 coils. A voltage of DC 77V or higher confirms the energized state. The electrician in the remote driver's cab also measures the voltage of the DIR1 and DIR2 coils. A voltage of 0V confirms the de-energized state.

[0044] Step 5: Simulate an occasional overcurrent in the safety interlock control circuit, where the remote driver's cab electrician disconnects the remote driver's cab CLCB circuit breaker.

[0045] Step 6: The electrician in the driver's cab immediately uses a multimeter to measure the voltage of the DIR1 and DIR2 coils in the driver's cab. If the voltage is 0V, it is confirmed that the power is off.

[0046] Step 7: After 10 seconds, the electrician in the driver's cab will use a multimeter to measure the voltage of the CLCBR, DIR1, and DIR2 coils in the driver's cab. If the voltage is above DC 77V, it is confirmed that the system is energized.

[0047] When the above steps are followed and the work is performed as required, it proves that the invention can fully meet the redundant power supply control function for intermittent circuit breaker failures in the door safety interlock control circuit.

[0048] In summary, by utilizing the above-mentioned technical solution of the present invention and designing a novel door safety interlock control circuit, when an intermittent short circuit or overcurrent fault occurs in the door interlock circuit, the circuit of the present invention can detect the tripping of the remote circuit breaker and automatically achieve redundant power supply through the novel control circuit. This avoids the driver operating the bypass switch to limit the speed and cause passengers to be emptied, allowing the vehicle to run to the destination and return to the depot. It can effectively avoid the significant operational impact caused by passengers being emptied due to intermittent short circuits or overcurrent faults in the door interlock circuit.

[0049] Furthermore, this invention effectively improves the fault redundancy of the door safety interlock circuit and enhances operational reliability. This is especially important for first-tier cities with numerous subway lines, where each passenger evacuation and rescue operation impacts annual operational targets, which are related to economic indicators. Subway companies assess vehicle manufacturers based on contract requirements, resulting in economic losses for manufacturers. This invention's circuit can alleviate the operational pressure on subway companies and eliminate passenger evacuation failures caused by intermittent electrical faults in the door safety interlock circuit to a certain extent. It is initially estimated to bring 200,000 to 500,000 yuan in economic benefits annually. Simultaneously, it improves vehicle availability, and this invention can be widely applied in all rail transit vehicle projects.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A door safety interlock circuit capable of automatic redundant power supply in case of failure, comprising a near-end control circuit and a far-end control circuit interconnected, wherein the near-end control circuit and the far-end control circuit have the same structure, characterized in that: The near-end control circuit includes a self-resetting time-delay relay CLCBR, a circuit breaker CLCB, a self-resetting circuit breaker CLCBRCB, a redundant circuit breaker CLCB_1, a relay DIR1, a relay DIR2, a door isolating switch LOS, several activation relays COR1, and several door controllers EDCU. The self-resetting time delay relay CLCBR is connected in series with the auxiliary contact of the circuit breaker CLCB and the self-resetting circuit breaker CLCBRCB, and then connected in parallel with the power supply. The relay DIR1 is connected in series with several activation relays COR1 and the circuit breaker CLCB, and then connected in parallel with the power supply. The relay DIR1 is also connected in parallel with the relay DIR2. The redundant circuit breaker CLCB_1 is connected in series with the auxiliary contact of the self-resetting time delay relay CLCBR in the remote control circuit, and then connected in parallel with the circuit breaker CLCB. The auxiliary contact of the self-resetting time delay relay CLCBR is connected in series with the redundant circuit breaker CLCB_1 in the remote control circuit, and then connected in parallel with the circuit breaker CLCB in the remote control circuit. Several door controllers EDCUs are connected in series and then connected in parallel with the activation relay COR1. The door isolation switch LOS is connected in parallel between the two ends of each door controller EDCU. Each door controller EDCU is composed of a door closed limit switch DLS1 and a door locked limit switch DLS2 connected in series. The redundant circuit breaker CLCB_1 in the near-end control circuit is connected in series with the normally open contact of the self-resetting time delay relay CLCBR in the far-end control circuit, and then connected in parallel with the auxiliary contact of the circuit breaker CLCB in the near-end control circuit for power supply, and together provide circuit breaker protection for the door interlock control circuit.

2. The door safety interlock circuit with automatic redundant power supply in case of failure as described in claim 1, characterized in that, The door interlock control circuit can automatically restore control in the event of an intermittent fault.

3. A door safety interlock circuit with automatic redundant power supply in case of failure as described in claim 2, characterized in that, The intermittent faults include overcurrent faults or short-circuit faults.

4. A door safety interlock circuit with automatic redundant power supply in case of failure as described in claim 3, characterized in that, The automatic recovery of control in the event of an intermittent fault in the door interlock control circuit includes the following steps: When the circuit breaker CLCB in the remote driver's cab trips, DC110V supplies power to the self-resetting time-delay relay CLCBR through the self-resetting circuit breaker CLCBRCB. After 10 seconds, the normally open contact of the self-resetting time-delay relay CLCBR closes, causing the current redundant circuit breaker CLCB_1 in the driver's cab to automatically take over the circuit breaker protection function of the door interlock control circuit after a delay.

5. A door safety interlock circuit with automatic redundant power supply in case of failure as described in claim 1, characterized in that, The door-closed limit switch DLS1 is used to output an indicator of whether the door is closed properly, and the door-locked limit switch DLS2 is used to output an indicator of whether the door is locked properly.

6. A door safety interlock circuit with automatic redundant power supply in case of failure as described in claim 5, characterized in that, The door controller EDCU and the door disconnect switch LOS connected in parallel at both ends form a door unit, and the closed and locked contacts of all door units on the same side are connected in series to form a safety interlocking train line.

7. A door safety interlock circuit with automatic redundant power supply in case of failure as described in claim 6, characterized in that, The door disconnect switch LOS is used to bypass the contacts of the door closed limit switch DLS1 and door lock limit switch DLS2 of this unit after the door unit is released.

Images