A rail transit vehicle and leakage protection system and method thereof

Abstract

The present invention provides a rail transit vehicle and a leakage protection system and method thereof. The system comprises a main controller, a leakage detection unit, a door control unit, a vehicle body leakage protection circuit and a power supply control switch connecting an external power supply positive electrode and a load in the rail transit vehicle. The leakage detection unit is connected to the power supply control switch. The leakage detection unit is used to detect whether the vehicle has leakage. When the vehicle leakage is detected, the power supply control switch is disconnected. The door control unit is used to detect whether the vehicle door opening is triggered. The main controller is respectively connected to the leakage detection unit, the door control unit and the vehicle body leakage protection circuit. The main controller is used to trigger the vehicle body leakage protection circuit to be turned on when the vehicle leakage is detected and the vehicle door opening is detected to be triggered. Since one end of the vehicle body leakage protection circuit is grounded and the other end is connected to the negative electrode of the external power supply, the vehicle body potential is consistent with the negative electrode of the external power supply after the door is opened, so as to avoid electric shock to people getting off the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle leakage protection, and in particular to a rail transit vehicle and a leakage protection system and method thereof. Background Art

[0002] At present, urban rail trains and monorail vehicles are powered by overhead contact networks or contact rails. The leakage detection, positioning and protection system can only protect against leakage faults after the on-board high-speed circuit breaker, and passengers can be evacuated only when the vehicle body is effectively grounded. However, when the leakage point occurs in the circuit before the on-board high-speed circuit breaker, the vehicle's original leakage protection cannot effectively eliminate the leakage fault, and the vehicle body may still have a high voltage. If the vehicle stops in an ungrounded rail section and evacuates passengers, it will cause electric shock. Summary of the invention

[0003] Based on this, it is necessary to provide a rail transit vehicle and its leakage protection system and method to solve the problem that the leakage point in front of the on-board high-speed circuit breaker causes abnormal voltage in the vehicle body, resulting in electric shock to people getting off the vehicle.

[0004] In a first aspect, a leakage protection system for a rail transit vehicle is provided, the leakage protection system comprising a main controller, a leakage detection unit, a door control unit, a vehicle body leakage protection circuit, and a power supply control switch connecting an external power supply positive electrode and a load in the rail transit vehicle;

[0005] The leakage detection unit controls the connection of the power supply control switch, and the leakage detection unit is used to detect whether the rail transit vehicle has leakage, and when the rail transit vehicle is detected to have leakage, the power supply control switch is disconnected;

[0006] One end of the vehicle body leakage protection circuit is grounded, and the other end of the vehicle body leakage protection circuit is used to be connected to the negative electrode of the external power supply;

[0007] The door control unit is used to detect whether the door opening of the rail transit vehicle is triggered;

[0008] The main controller is respectively connected to the leakage detection unit, the door control unit and the vehicle body leakage protection circuit. The main controller is used to trigger the vehicle body leakage protection circuit to turn on when it detects leakage of the rail transit vehicle and detects that the door of the rail transit vehicle is opened and triggered.

[0009] In a second aspect, a leakage protection method for a rail transit vehicle is provided.

[0010] The leakage protection method comprises the following steps:

[0011] Detecting whether the rail transit vehicle has leakage, and if leakage is detected in the rail transit vehicle, disconnecting the power supply connection between the load in the rail transit vehicle and the external power supply positive electrode;

[0012] Detect whether the door opening of the rail transit vehicle is triggered. If it is detected that the door opening of the rail transit vehicle is triggered, the body leakage protection circuit arranged in the rail transit vehicle is triggered to be turned on, so that the negative pole of the external power supply is grounded.

[0013] In a third aspect, an embodiment of the present invention provides a rail transit vehicle, comprising the leakage protection system described in the first aspect.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The leakage protection system of the present invention comprises a main controller, a leakage detection unit, a gate control unit, a vehicle body leakage protection circuit and a power supply control switch connecting an external power supply positive electrode and a load in a rail transit vehicle. The leakage detection unit controls the connection of the power supply control switch. The leakage detection unit is used to detect whether the rail transit vehicle has leakage, and when leakage of the rail transit vehicle is detected, the power supply control switch is disconnected. One end of the vehicle body leakage protection circuit is grounded, and the other end of the vehicle body leakage protection circuit is used to be connected to the negative electrode of the external power supply. The gate control unit is used to detect whether the door opening of the rail transit vehicle is triggered. The main controller is respectively connected to the leakage detection unit, the gate control unit and the vehicle body leakage protection circuit. The main controller is used to trigger the vehicle body leakage protection circuit to be turned on when leakage of the rail transit vehicle is detected and the door opening of the rail transit vehicle is detected to be triggered. When the door of the rail transit vehicle is detected to be opened, the leakage protection circuit is triggered, so that the potential of the rail transit vehicle body can be maintained consistent with the negative electrode of the power supply after the door is opened, so as to avoid electric shock when people get off the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1 It is a structural schematic diagram of a leakage protection system for a rail transit vehicle according to an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a leakage protection system for a rail transit vehicle according to an embodiment of the present invention;

[0019] Figure 3 It is a structural schematic diagram of a leakage protection system for a rail transit vehicle according to an embodiment of the present invention;

[0020] Figure 4 It is a structural schematic diagram of a leakage protection system for a rail transit vehicle according to an embodiment of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a leakage protection system for a rail transit vehicle according to an embodiment of the present invention;

[0022] Figure 6 It is a structural schematic diagram of a leakage protection system for a rail transit vehicle according to an embodiment of the present invention;

[0023] Figure 7 It is a structural schematic diagram of a leakage protection system of a power supply system of a rail transit vehicle according to an embodiment of the present invention;

[0024] Figure 8 It is a schematic flow chart of a leakage protection method for a rail transit vehicle according to an embodiment of the present invention;

[0025] Among them, 100 is a leakage protection system, 101 is a main controller, 102 is a vehicle body leakage protection circuit, 103 is a door control unit, 104 is a leakage detection unit, 105 is a power supply control switch, 106 is a battery management controller, 1031 is a door opening button, 1032 is a door controller, GR is an overvoltage relay, QS3 is a grounding switch, VT3 is a reverse diode, g1 is a first acquisition terminal, g2 is a second acquisition terminal, KM4 is a short-circuit contactor, e1 is a first control terminal, a1 is a first input terminal, and a2 is a first output terminal. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0028] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] As used in the present specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]", depending on the context.

[0030] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0032] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0033] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0034] See also Figure 1 , is a schematic diagram of the structure of a leakage protection system for a rail transit vehicle provided according to an embodiment of the present invention. Figure 1 As shown, the leakage protection system 100 for rail transit vehicles according to the embodiment of the present invention includes: a main controller 101, a vehicle body leakage protection circuit 102, a gate control unit 103, a leakage detection unit 104, and a power supply control switch 105. The main controller 101 is respectively connected to the leakage detection unit 104, the gate control unit 103 and the vehicle body leakage protection circuit 102, the leakage detection unit 104 controls the connection of the power supply control switch 105, one end of the vehicle body leakage protection circuit 102 is grounded, and the other end of the vehicle body leakage protection circuit 102 is used to be connected to the negative pole of the external power supply.

[0035] The power supply control switch 105 connects the positive electrode of the external power supply to the load in the vehicle. When the power supply control switch 105 is turned on, the external power supply supplies power to the load in the vehicle. In one embodiment, the power supply control switch 105 is a vehicle-mounted high-speed circuit breaker.

[0036] The leakage detection unit 104 is used to detect whether the rail transit vehicle has leakage, and when leakage is detected in the rail transit vehicle, the power supply control switch 105 is disconnected. The door control unit 103 is used to detect whether the opening of the door of the rail transit vehicle is triggered. When the door control unit 103 detects that the opening of the door of the rail transit vehicle is triggered, the door control unit 103 sends a signal that the door opening is triggered to the main controller 101. The main controller 101 is used to trigger the body leakage protection circuit 102 to turn on when leakage is detected in the rail transit vehicle and the opening of the door of the rail transit vehicle is triggered.

[0037] Since one end of the vehicle body leakage protection circuit 102 is grounded and the other end of the vehicle body leakage protection circuit 102 is used to connect to the negative pole of the external power supply, when the vehicle body leakage protection circuit 102 is turned on, it can disperse the current and make the current flow to the ground, thereby protecting the personal safety of personnel when they get out of the rail transit vehicle.

[0038] In one embodiment, see Figure 2 The leakage detection unit 104 is an overvoltage leakage protection device, which includes an overvoltage relay GR, a grounding switch QS3 and a reverse diode VT3. One end of the grounding switch QS3 is connected to the negative pole of the external power supply, and the other end is connected to the overvoltage relay GR through the reverse diode VT3. The other end of the overvoltage relay GR is grounded.

[0039] Specifically, the essence of the leakage detection unit 104 detecting whether the vehicle has leakage is to detect the current flowing through the overvoltage relay GR and the voltage across the relay, and when it is detected that the current flowing through the overvoltage relay GR is greater than a preset current threshold, or when it is detected that the voltage across the overvoltage relay is greater than a preset voltage threshold, it is determined that the rail transit vehicle has leakage. Among them, the grounding switch QS3 is a normally closed switch, which is used to avoid misoperation of the circuit breaker.

[0040] It should be noted that the overvoltage relay GR needs to be connected to a low-voltage power supply. A low-voltage power supply is set in the leakage detection unit 104, so that one of the pins of the overvoltage relay GR is connected to the positive pole of the low-voltage power supply, and the corresponding pin is connected to the negative pole of the low-voltage power supply. The low-voltage power supply is generally 110V, so that it can control the power supply control switch 105 to shut down when a vehicle leakage is detected.

[0041] In one embodiment, see Figure 3The leakage protection system 100 may further include a battery management controller 106 , which is connected to the main controller 101 and the leakage detection unit 104 . When the leakage detection unit 104 detects leakage, the battery management controller sends a leakage signal to the main controller 101 .

[0042] Specifically, the battery management controller 106 includes a first acquisition terminal g1, which is used to collect the action of the overvoltage relay GR in the leakage detection unit 104. When the leakage detection unit detects leakage, the action of the relay GR in the leakage detection unit 104 changes. After the first acquisition terminal g1 of the battery management controller collects the action of the relay GR, the battery management controller sends a leakage signal to the main controller 101. The change in the action of the overvoltage relay GR is the change in the state of the automatic switch in the overvoltage relay GR. When the voltage value through the overvoltage relay GR is large, the switch in the overvoltage relay GR will automatically change.

[0043] In one embodiment, see Figure 4 The vehicle body leakage protection circuit 102 includes a shorting contactor KM4, which includes a first control terminal e1, a first input terminal a1 and a first output terminal a2. The first output terminal a2 is grounded through a line, and the first input terminal a1 is used to connect to the negative pole of an external power supply. The battery management controller 106 is connected to the first control terminal e1. The battery management controller 106 is used to control the shorting contactor KM4 to turn on after receiving a signal from the main controller 101 to trigger the vehicle body leakage protection circuit 102 to turn on.

[0044] Specifically, after the battery management controller 106 sends a leakage signal to the main controller 101, the battery management controller 106 receives a signal from the main controller 101 to turn on the shorting contactor KM4, and controls the shorting contactor KM4 to turn on. In one embodiment, when the battery management controller 106 receives a signal from the main controller 101 to turn on the shorting contactor KM4, the battery management controller 106 delays 1 second to control the turning on of the shorting contactor KM4.

[0045] Due to the possible failure of the short-circuit contactor KM4 and other reasons, it eventually fails to conduct and the above-mentioned leakage protection function cannot be achieved. Therefore, after the battery management controller 106 sends a conduction control signal to the short-circuit contactor KM4, it further detects whether the short-circuit contactor KM4 is conducted. If the battery management controller detects that the short-circuit contactor KM4 is conducted, the battery management controller sends the conduction status of the short-circuit contactor KM4 to the main controller 101. After the main controller receives the conduction status of the short-circuit contactor KM4, it can also send a door opening command to the door control unit 103.

[0046] The signal sent by the main controller 101 indicating that the short-circuit contactor KM4 is turned on is a signal that can be sent only when the door opening of the rail transit vehicle is triggered, and the door control unit 103 is used to detect whether the door opening of the rail transit vehicle is triggered.

[0047] In one embodiment, see Figure 5 The door control unit 103 includes a door opening button 1031 and a door controller 1032. The main controller 101 is connected to the door opening button 1031 and the door controller 1032. When the main controller 101 receives a trigger signal indicating that the door opening button 1031 is triggered, it determines that the door opening of the rail transit vehicle is triggered. The battery management controller 106 is connected to the first control end to detect the state of the short-circuit contactor KM4, and when it is detected that the state of the short-circuit contactor KM4 is on, it sends a door opening signal to the main controller 101. The main controller 101 controls the door to open through the door controller 1032.

[0048] In one embodiment, the door control unit 103 also includes an emergency door opening switch, and the door controller 1032 is connected to the emergency door opening switch to detect whether the emergency door opening switch is triggered. The door controller 1032 is used to monitor the emergency door opening state of the rail transit vehicle door when it detects that the emergency door opening switch is triggered, and when the emergency door opening state is open, sends a signal to the main controller indicating that the door opening of the rail transit vehicle is triggered.

[0049] Specifically, when the door control unit 103 detects whether the opening of the door of the rail transit vehicle is triggered, under normal circumstances, when it is detected that the door opening button 1031 is triggered, it is considered that the opening of the door of the rail transit vehicle is triggered.

[0050] Among them, the main controller 101 includes a second acquisition terminal g2, which collects the door opening button 1031 signal. When the main controller 101 collects the door opening button 1031 signal, it sends a leakage door opening signal to the battery management controller. When the battery management controller receives the leakage door opening signal sent by the main controller 101, the battery management controller controls the short-circuit contactor KM4 to be in a conductive state, and sends the conductive state of the short-circuit contactor KM4 to the main controller 101. The main controller sends a leakage door opening signal to the door controller 1032. After the door controller 1032 receives the leakage door opening signal sent by the main controller, it controls the door of the rail transit vehicle to open.

[0051] In an abnormal situation, for example, when encountering an emergency, the door controller 1032 receives the emergency door opening state sent by the door controller 1032, wherein the state of opening the door is not performed by the normal door opening button 1031, which is the emergency door opening state. When the door controller 1032 collects the emergency door opening state of the rail transit vehicle, the door controller 1032 detects whether the emergency door opening switch is triggered. When the emergency door opening switch is triggered, the door controller 1032 monitors the emergency door opening state. When the emergency door opening switch is triggered, the emergency door opening state is turned on, and the door opening of the rail transit vehicle is triggered, and the door controller 1032 detects whether the emergency door opening switch is triggered. 32 sends the emergency door opening status to the main controller. When the main controller 101 receives the emergency door opening status, it sends a leakage door opening signal to the battery management controller. When the battery management controller receives the leakage door opening signal sent by the main controller 101, the battery management controller controls the short-circuit contactor KM4 to be in a conductive state, and sends the conductive state of the short-circuit contactor KM4 to the main controller 101. The main controller sends a leakage door opening signal to the door controller 1032. After the door controller 1032 receives the leakage door opening signal sent by the main controller 101, it controls the door of the rail transit vehicle to open.

[0052] It should be noted that when the main controller 101 collects the signal of the door opening button 1031 or receives the emergency door opening status sent by the door controller 1032, the main controller 101 sends a leakage door opening signal to the load connected to the power supply control switch 105 and the battery management controller through the power supply control switch 105. When the load connected to the power supply control switch 105 receives the leakage door opening signal sent by the main controller 101, the load controls the corresponding power supply control switch 105 to disconnect the power supply control switch 105.

[0053] In one embodiment, a plurality of loads are provided in the vehicle, and the plurality of loads are connected to an external power supply through a corresponding pre-charging circuit, wherein each pre-charging circuit is composed of a pre-charging group and two controllable switches. The pre-charging circuit includes a pre-charging group, a first controllable switch and a second controllable switch, wherein the pre-charging group is connected in series with the second controllable switch and in parallel with the first controllable switch. The load can be a vehicle air conditioner, a traction inverter, an auxiliary converter, etc.

[0054] When the power supply control switch 105 is controlled to be turned off, the connection between the load and the external power supply is also disconnected through the corresponding pre-charging circuit to prevent the load from supplying reverse power to the external power supply.

[0055] In one embodiment, see Figure 6The leakage protection system 100 may include a fuse, a voltage sensor, and a current sensor, wherein one end of the fuse is connected to the positive pole of the external power supply, and the other end is connected to the high-speed circuit breaker, one end of the high-speed circuit breaker is connected to the high-speed fuse, and the other end is connected to the voltage sensor, one end of the voltage sensor is connected to the high-speed fuse, and the other end is connected to the negative pole of the external power supply, one end of the current sensor is connected to the high-speed circuit breaker, and the other end is connected to the power supply control switch 105, the voltage sensor is used to detect the voltage of the negative pole of the external power supply of the load and the voltage on the surface of the vehicle body, and the current sensor is used to detect the current between the positive pole of the external power supply and the load, and when the voltage difference between the voltage on the surface of the vehicle body and the voltage of the negative pole of the external power supply of the load is greater than the voltage threshold, the high-speed circuit breaker is disconnected. When it is detected that the current flowing through the load is greater than the current threshold, the heat generated by itself melts the fuse, thereby disconnecting the circuit.

[0056] In one embodiment, see Figure 7 For the external power supply of rail transit vehicles, each external power supply station is equipped with a DC-DC converter and a ground leakage protection device. The DC-DC converter is the power supply system of the rail transit vehicle. The input and output ends of the DC-DC converter are isolated from each other. The output end is used to supply power to the rail transit vehicle through the track line. The ground leakage protection device is used to protect the power supply system of the rail transit vehicle. The input end of the DC-DC converter is connected to the positive pole of the external power supply, and the output end is connected to the negative pole of the external power supply. One end of the ground leakage protection device is connected to the negative pole of the external power supply and the other end is grounded. It is used to protect when the negative pole voltage of the external power supply is greater than the preset threshold value, and disconnect the output power of the DC-DC converter. The ground leakage protection device includes a feeder circuit breaker KM9, a leakage detection resistor R4 and a reverse diode D2, wherein the feeder circuit breaker KM9, the leakage detection resistor R4 and the reverse diode D2 are connected in series between the negative pole of the external power supply and the DC-DC converter. The ground leakage protection device is used to detect the current flowing through the leakage detection resistor R4 or to detect the voltage across the leakage detection resistor R4, and when the current flowing through the leakage detection resistor R4 is greater than the preset detection current or the voltage across the leakage detection resistor R4 is greater than the preset monitoring voltage, the feeder circuit breaker KM9 is disconnected to stop the DC-DC converter from outputting voltage.

[0057] In one embodiment, see Figure 8 , is a flow chart of a leakage protection method for a rail transit vehicle provided by an embodiment of the present invention. The leakage protection method for a rail transit vehicle can be applied to Figure 1 The leakage protection system of the rail transit vehicle in the present invention can include the following steps:

[0058] S801: Detect whether the rail transit vehicle has leakage. If leakage is detected in the rail transit vehicle, disconnect the power supply connection between the load in the rail transit vehicle and the positive pole of the external power supply.

[0059] Specifically, detecting whether a rail transit vehicle has leakage includes:

[0060] Obtaining the negative electrode voltage of the connection line between the load in the rail transit vehicle and the negative electrode of the external power supply, and the body surface voltage of the rail transit vehicle;

[0061] Detect whether the difference between the vehicle body surface voltage and the negative electrode voltage is greater than the voltage threshold;

[0062] If the difference between the detected body surface voltage and the negative pole voltage is greater than the voltage threshold, it is determined that the rail transit vehicle has a leakage; or if the difference between the detected body surface voltage and the negative pole voltage is not greater than the voltage threshold, it is determined that the rail transit vehicle has no leakage.

[0063] In this embodiment, when detecting whether the rail transit vehicle has leakage, the voltage difference between the voltage of the negative electrode of the external power supply of the load in the vehicle and the voltage on the surface of the vehicle body is detected to determine whether the rail transit vehicle has leakage. When detecting the voltage of the negative electrode of the external power supply of the load and the voltage on the surface of the vehicle body, detection is performed by a voltage sensor. When the voltage of the negative electrode of the external power supply of the load and the voltage on the surface of the vehicle body are greater than a preset voltage threshold, the power supply connection between the load in the rail transit vehicle and the positive electrode of the external power supply is disconnected. In this embodiment, when leakage of the rail transit vehicle is detected, the power supply connection between the load in the rail transit vehicle and the positive electrode of the external power supply is disconnected by disconnecting the high-speed circuit breaker connected to the positive electrode of the external power supply.

[0064] S802: Detect whether the door opening of the rail transit vehicle is triggered. If it is detected that the door opening of the rail transit vehicle is triggered, the body leakage protection circuit set in the rail transit vehicle is triggered to turn on, so that the negative pole of the external power supply is grounded.

[0065] Among them, detecting whether the door opening of the rail transit vehicle is triggered includes:

[0066] Detect whether the emergency door opening switch in the rail transit vehicle is triggered;

[0067] If the emergency door opening switch is detected to be triggered, the emergency door opening state of the rail transit vehicle door is monitored;

[0068] If the emergency door opening state is enabled, it is determined that the door opening of the rail transit vehicle is triggered.

[0069] In this embodiment, the main controller collects the door opening button signal. When the main controller collects the door opening button signal, it is considered that the door opening of the rail transit vehicle is triggered, or when the door controller collects the emergency door opening action and sends the emergency door opening status to the main controller, when the main controller receives the emergency door opening status sent by the door controller, it is considered that the door of the rail transit vehicle is triggered.

[0070] In one embodiment, see Figures 1 to 8The present invention also provides a rail transit vehicle, which includes a load, a door and a leakage protection system 100, and the leakage protection system 100 includes: a main controller 101, a vehicle body leakage protection circuit 102, a door control unit 103, a leakage detection unit 104, and a power supply control switch 105. The main controller 101 is respectively connected to the leakage detection unit 104, the door control unit 103 and the vehicle body leakage protection circuit 102, the leakage detection unit 104 controls the connection of the power supply control switch 105, one end of the vehicle body leakage protection circuit 102 is grounded, and the other end of the vehicle body leakage protection circuit 102 is used to be connected to the negative pole of the external power supply.

[0071] The power supply control switch 105 connects the positive electrode of the external power supply to the load in the vehicle. When the power supply control switch 105 is turned on, the external power supply supplies power to the load in the vehicle. In one embodiment, the power supply control switch 105 is a vehicle-mounted high-speed circuit breaker.

[0072] The leakage detection unit 104 is used to detect whether the rail transit vehicle has leakage, and when leakage is detected in the rail transit vehicle, the power supply control switch 105 is disconnected. The door control unit 103 is used to detect whether the opening of the door of the rail transit vehicle is triggered. When the door control unit 103 detects that the opening of the door of the rail transit vehicle is triggered, the door control unit 103 sends a signal that the door opening is triggered to the main controller 101. The main controller 101 is used to trigger the body leakage protection circuit 102 to turn on when leakage is detected in the rail transit vehicle and the opening of the door of the rail transit vehicle is triggered.

[0073] Since one end of the vehicle body leakage protection circuit 102 is grounded and the other end of the vehicle body leakage protection circuit 102 is used to connect to the negative pole of the external power supply, when the vehicle body leakage protection circuit 102 is turned on, it can disperse the current and make the current flow to the ground, thereby protecting the personal safety of personnel when they get out of the rail transit vehicle.

[0074] In one embodiment, the leakage detection unit 104 is an overvoltage leakage protection device, which includes an overvoltage relay GR, a grounding switch QS3 and a reverse diode VT3. One end of the grounding switch QS3 is connected to the negative pole of the external power supply, and the other end is connected to the overvoltage relay GR through the reverse diode VT3. The other end of the overvoltage relay GR is grounded.

[0075] In one embodiment, the leakage protection system 100 may further include a battery management controller 106 , which is connected to the main controller 101 and the leakage detection unit 104 . When the leakage detection unit 104 detects leakage, the battery management controller sends a leakage signal to the main controller 101 .

[0076] In one embodiment, the vehicle body leakage protection circuit 102 includes a short-circuit contactor KM4, which includes a first control terminal e1, a first input terminal a1 and a first output terminal a2. The first output terminal a2 is grounded through a line, and the first input terminal a1 is used to connect to the negative pole of an external power supply. The battery management controller 106 is connected to the first control terminal e1, and the battery management controller 106 is used to control the short-circuit contactor KM4 to turn on after receiving a signal sent by the main controller 101 to trigger the vehicle body leakage protection circuit 102 to turn on.

[0077] In one embodiment, the door control unit 103 includes a door opening button 1031 and a door controller 1032. The main controller 101 is connected to the door opening button 1031 and the door controller 1032. When the main controller 101 receives a trigger signal indicating that the door opening button 1031 is triggered, it determines that the door opening of the rail transit vehicle is triggered. The battery management controller 106 is connected to the first control end to detect the state of the short-circuit contactor KM4, and when it is detected that the state of the short-circuit contactor KM4 is on, it sends a door opening signal to the main controller 101. The main controller 101 controls the door opening through the door controller 1032.

[0078] In one embodiment, the door control unit 103 also includes an emergency door opening switch, and the door controller 1032 is connected to the emergency door opening switch to detect whether the emergency door opening switch is triggered. The door controller 1032 is used to monitor the emergency door opening state of the rail transit vehicle door when it detects that the emergency door opening switch is triggered, and when the emergency door opening state is open, sends a signal to the main controller indicating that the door opening of the rail transit vehicle is triggered.

[0079] In one embodiment, a plurality of loads are provided in the vehicle, and the plurality of loads are connected to an external power supply through a corresponding pre-charging circuit, wherein each pre-charging circuit is composed of a pre-charging group and two controllable switches. The pre-charging circuit includes a pre-charging group, a first controllable switch and a second controllable switch, wherein the pre-charging group is connected in series with the second controllable switch and in parallel with the first controllable switch. The load can be a vehicle air conditioner, a traction inverter, an auxiliary converter, etc.

[0080] In one embodiment, the leakage protection system 100 may include a fuse, a voltage sensor, and a current sensor, wherein one end of the fuse is connected to the positive pole of the external power supply, and the other end is connected to the high-speed circuit breaker, one end of the high-speed circuit breaker is connected to the high-speed fuse, and the other end is connected to the voltage sensor, one end of the voltage sensor is connected to the high-speed fuse, and the other end is connected to the negative pole of the external power supply, one end of the current sensor is connected to the high-speed circuit breaker, and the other end is connected to the power supply control switch 105, the voltage sensor is used to detect the voltage of the negative pole of the external power supply of the load and the voltage on the surface of the vehicle body, and the current sensor is used to detect the current between the positive pole of the external power supply and the load, and when the voltage difference between the voltage on the surface of the vehicle body and the voltage of the negative pole of the external power supply of the load is greater than the voltage threshold, the high-speed circuit breaker is disconnected. When it is detected that the current flowing through the load is greater than the current threshold, the fuse is melted by the heat generated by itself, thereby disconnecting the circuit.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A leakage protection system for rail transit vehicles, characterized in that: The leakage protection system includes a main controller, a leakage detection unit, a door control unit, a vehicle body leakage protection circuit, and a power supply control switch connecting an external power supply positive electrode and a load in the rail transit vehicle; The leakage detection unit controls the connection of the power supply control switch, and the leakage detection unit is used to detect whether the rail transit vehicle has leakage, and when the rail transit vehicle is detected to have leakage, the power supply control switch is disconnected; One end of the vehicle body leakage protection circuit is grounded, and the other end of the vehicle body leakage protection circuit is used to be connected to the negative electrode of the external power supply; The door control unit is used to detect whether the door opening of the rail transit vehicle is triggered; The main controller is connected to the leakage detection unit, the door control unit and the vehicle body leakage protection circuit respectively, and the main controller is used to trigger the vehicle body leakage protection circuit to turn on when the leakage of the rail transit vehicle is detected and the door of the rail transit vehicle is opened and triggered; The leakage protection system further includes a battery management controller, which is connected to the main controller and the leakage detection unit, and is used to send a leakage signal to the main controller when the leakage detection unit detects leakage of the rail transit vehicle; The vehicle body leakage protection circuit includes a short-circuit contactor, which includes a first control end, a first input end and a first output end, wherein the first output end is grounded through a line, the first input end is used to be connected to the negative electrode of the external power supply, the battery management controller is connected to the first control end, and the battery management controller is used to control the short-circuit contactor to be turned on after receiving a signal sent by the main controller to trigger the vehicle body leakage protection circuit to be turned on; The door control unit includes a door opening button and a door controller, the main controller is connected to the door opening button and the door controller, and when the main controller receives a trigger signal indicating that the door opening button is triggered, it determines that the door opening of the rail transit vehicle is triggered; The battery management controller is connected to the first control end to detect the state of the short-circuit contactor, and when it is detected that the state of the short-circuit contactor is on, it sends a door opening signal to the main controller, and the main controller controls the vehicle door to open through the door controller.

2. The leakage protection system for rail transit vehicles according to claim 1, characterized in that: The door control unit also includes an emergency door opening switch, and the door controller is connected to the emergency door opening switch to detect whether the emergency door opening switch is triggered. The door controller is used to monitor the emergency door opening state of the door of the rail transit vehicle when it is detected that the emergency door opening switch is triggered, and when the emergency door opening state is opened, send a signal to the main controller to detect that the door opening of the rail transit vehicle is triggered.

3. A leakage protection method for rail transit vehicles, characterized in that: The leakage protection method is applied to the leakage protection system of the rail transit vehicle according to any one of claims 1 to 2, comprising the following steps: Detecting whether the rail transit vehicle has leakage, and if leakage is detected in the rail transit vehicle, disconnecting the power supply connection between the load in the rail transit vehicle and the external power supply positive electrode; Detecting whether the door opening of the rail transit vehicle is triggered, if it is detected that the door opening of the rail transit vehicle is triggered, triggering the body leakage protection circuit arranged in the rail transit vehicle to be turned on, so that the negative pole of the external power supply is grounded; The detecting whether the door opening of the rail transit vehicle is triggered includes: Detecting whether a door opening button in the rail transit vehicle is triggered; If a trigger signal indicating that the door opening button is triggered is received, it is determined that the door opening of the rail transit vehicle is triggered.

4. The leakage protection method for rail transit vehicles as claimed in claim 3, characterized in that: The detecting whether the rail transit vehicle has leakage includes: Obtaining the negative electrode voltage of the connection line between the load in the rail transit vehicle and the negative electrode of the external power supply, and the body surface voltage of the rail transit vehicle; Detecting whether the difference between the vehicle body surface voltage and the negative electrode voltage is greater than a voltage threshold; If it is detected that the difference between the vehicle body surface voltage and the negative electrode voltage is greater than the voltage threshold, it is determined that the rail transit vehicle is leaking; or if it is detected that the difference between the vehicle body surface voltage and the negative electrode voltage is not greater than the voltage threshold, it is determined that the rail transit vehicle is not leaking.

5. The leakage protection method for rail transit vehicles as claimed in claim 3, characterized in that: The detecting whether the door opening of the rail transit vehicle is triggered includes: Detecting whether an emergency door opening switch in the rail transit vehicle is triggered; If it is detected that the emergency door opening switch is triggered, the emergency door opening state of the door of the rail transit vehicle is monitored; If the emergency door opening state is opened, it is determined that the door opening of the rail transit vehicle is triggered.

6. A rail transit vehicle, characterized in that: The invention comprises the leakage protection system as described in any one of claims 1 to 2.

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