Locomotive fireless return control circuit and vehicle

Abstract

The application discloses a locomotive fireless return control circuit and a vehicle, and applies to the field of track transportation. The principle of the locomotive fireless return control circuit provided by the application is as follows: when the first end of a fireless selection switch and the second end of the fireless selection switch are conducted, the brake release circuit and the emergency control circuit are connected to the locomotive fireless return control circuit through the second contact of a parking brake release button and a storage battery output contactor respectively; when the third end of the fireless selection switch and the fourth end of the fireless selection switch are conducted, the brake release circuit is connected to the locomotive fireless return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive fireless return control circuit is disconnected through an emergency bypass relay and the storage battery output contactor. It can be seen that the application simplifies the fireless return process of the driver and the attendant, does not need to get off the car body to handle a hand release ring, is simple and safe to operate, improves work efficiency, and improves the safety during vehicle operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, in particular to a locomotive fireless return control circuit and a vehicle. BACKGROUND

[0002] At present, the parking brake of the electric locomotive is controlled by the driver pressing the parking release and parking application buttons on the operation table to control the on-off of the parking release electromagnetic valve and the parking application electromagnetic valve, and then to control the release and application of the brake clamp. A parking indicator is arranged outside the vehicle to identify the release and application state of the parking brake, and the locomotive control system judges the parking brake state by collecting the state of the parking brake pressure switch and the isolation plug door, and prompts the driver on the microcomputer display screen. When the electric locomotive is used as a trailer for fireless return, the locomotive itself is in a non-electric state, at this time, the parking brake and the emergency brake are automatically applied due to power failure, and the driver needs to manually move the parking brake isolation plug door from the inserted position to the isolation position, and then pull the hand release ring on the parking brake unit brake to empty the air pressure in the parking pipe to release the parking brake.

[0003] Among them, when the electric locomotive is used as a trailer for fireless return, the driver cannot observe the parking brake application and release state due to the non-electric state of the locomotive body, and if the parking brake is not released, the locomotive will run with the brake applied, causing wheel rubbing accidents or wheelset overheating failures, which poses a great risk to train safety. Moreover, the hand release ring is located under the vehicle, and when the locomotive runs in the third rail power supply section, the driver needs to manually release the parking brake under the vehicle, which poses a safety risk of electric shock.

[0004] In view of the above-mentioned technology, it is an urgent problem for those skilled in the art to seek a locomotive fireless return control circuit. SUMMARY

[0005] The purpose of the present application is to provide a locomotive fireless return control circuit and a vehicle. The problem that the driver cannot observe the parking brake application and release state, and the driver needs to manually release the parking brake under the vehicle, which poses a great risk to train safety and the safety of the driver, can be solved.

[0006] To solve the above-mentioned technical problem, the present application provides a locomotive fireless return control circuit, which comprises an emergency control circuit and a brake release circuit, and further comprises a fireless selection switch, an emergency bypass relay and a parking brake release button.

[0007] The first end of the no-fire selection switch is connected with the power supply; the second end of the no-fire selection switch is connected with the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected with the emergency control circuit; the fourth end of the no-fire selection switch is connected with the battery output contactor;

[0008] The first end of the second contact of the parking brake release button is connected with the emergency control circuit; the second end of the second contact of the parking brake release button is connected with the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are connected to the locomotive no-fire return control circuit through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor.

[0009] Preferably, the emergency control circuit comprises: a first emergency loop and a second emergency loop;

[0010] The first end of the first emergency loop is connected with the third end of the no-fire selection switch, the positive pole of the power supply and the first end of the second contact of the parking brake release button, and the second end of the first emergency loop is connected with the first end of the second emergency loop;

[0011] The second end of the second emergency loop is connected with the negative pole of the power supply.

[0012] Preferably, the emergency control circuit further comprises: a first emergency relay and a second emergency relay;

[0013] The first end of the first emergency relay is connected with the second end of the first emergency loop and the first end of the second emergency relay;

[0014] The second end of the first emergency relay is connected with the second end of the second emergency relay and the first end of the second emergency loop.

[0015] Preferably, the brake release circuit comprises: a parking brake release solenoid, a parking brake release state relay and a parking brake pressure switch;

[0016] The first end of the parking brake release solenoid is connected with the second end of the first contact of the parking brake release button and the first end of the second contact of the parking brake release button, and the second end of the parking brake release solenoid is connected with the first end of the parking brake release state relay and the second end of the emergency bypass relay;

[0017] The second end of the parking brake release state relay is connected with the first end of the parking brake pressure switch;

[0018] The second end of the parking brake pressure switch is connected with the first end of the first contact of the parking brake release button and the second end of the second contact of the parking brake release button.

[0019] Preferably, further comprising: a first indicator light and a second indicator light;

[0020] The first end of the first indicator light is connected with the first end of the second indicator light, the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button.

[0021] The second end of the first indicator light and the second end of the second indicator light are connected with the second end of the emergency bypass relay.

[0022] Preferably, further comprising: a third indicator light;

[0023] The first end of the third indicator light is connected with the first end of the fire selection switch and the power supply, and the second end of the third indicator light is connected with the second end of the emergency bypass relay.

[0024] Preferably, further comprising: a first diode and a second diode;

[0025] The positive electrode of the first diode is connected with the first end of the emergency bypass relay, and the negative electrode of the first diode is connected with the first end of the first contact of the parking brake release button.

[0026] The positive electrode of the second diode is connected with the first end of the second contact of the parking brake release button, and the negative electrode of the second diode is connected with the brake release circuit and the second end of the first contact of the parking brake release button.

[0027] Preferably, further comprising: a third diode;

[0028] The positive electrode of the third diode is connected with the second end of the second contact of the parking brake release button.

[0029] The negative electrode of the third diode is connected with the first end of the first contact of the parking brake release button.

[0030] Preferably, further comprising: a key switch;

[0031] The first end of the key switch is connected with the fourth end of the fire selection switch.

[0032] The second end of the key switch is connected with the battery output contactor.

[0033] In another aspect, the application also provides a vehicle comprising the locomotive fireless return control circuit.

[0034] The locomotive fireless return control circuit provided by the application comprises an emergency control circuit, a brake release circuit, a fireless selection switch, an emergency bypass relay and a parking brake release button, wherein the first end of the fireless selection switch is connected with a power supply; the second end of the fireless selection switch is connected with the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the fireless selection switch is connected with the emergency control circuit; the fourth end of the fireless selection switch is connected with a battery output contactor; the first end of the second contact of the parking brake release button is connected with the emergency control circuit; the second end of the second contact of the parking brake release button is connected with the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the fireless selection switch and the second end of the fireless selection switch are turned on, the brake release circuit and the emergency control circuit are connected to the locomotive fireless return control circuit through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the fireless selection switch and the fourth end of the fireless selection switch are turned on, the brake release circuit is connected to the locomotive fireless return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive fireless return control circuit is disconnected through the emergency bypass relay and the battery output contactor. Therefore, the application can realize the function selection, interlocking and independent control between the fireless return and the normal locomotive operation without optimizing the complex on-board air brake pipe, simplify the fireless return process of the driver and crew, and improve the work efficiency. At the same time, the parking brake release circuit is used to monitor the parking brake in real time during the fireless return and directly feedback to the driver, thereby improving the safety of vehicle operation. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 The structural diagram of the locomotive fireless return control circuit provided by the embodiments of the application;

[0037] Figure 2 The control principle diagram of the locomotive fireless return control circuit provided by the embodiments of the application. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] The core of this application is to provide a locomotive fire-free return control circuit and a vehicle.

[0040] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0041] In order to solve the above technical problems, the present application provides a locomotive fire return control circuit, such as Figure 1 As shown, it includes emergency control circuit 1, brake release circuit 2, fire selection switch S03, emergency bypass relay K04 and parking brake release button S1. In addition, Figure 1 The circuit shown also includes: a power supply 3 and a battery output contactor Q01. The circuit connection relationship is as follows: the first end of the no-fire selection switch S03 is connected to the power supply 3; the second end of the no-fire selection switch S03 is connected to the first end of the emergency bypass relay K04 and the first end of the first contact S11 of the parking brake release button S1; the third end of the no-fire selection switch S03 is connected to the emergency control circuit 1; the fourth end of the no-fire selection switch S03 is connected to the battery output contactor Q01; the first end of the second contact S12 of the parking brake release button S1 is connected to the emergency control circuit 1; the second end of the second contact S12 of the parking brake release button S1 is connected to the second end of the first contact S11 of the parking brake release button S1 and the brake release circuit 2.

[0042] In a specific embodiment, the principle of the locomotive fire-free return control circuit provided by this application is as follows: when the locomotive is in normal operating mode, that is, the first end of the fire-free selection switch S03 and the second end of the fire-free selection switch S03 are connected, at this time the battery output contactor Q01 is energized and closed, and the emergency bypass relay K04 is de-energized and disconnected. The brake release circuit 2 is connected to the locomotive fire-free return control circuit through the second contact S12 of the parking brake release button S1 as a whole, so as to ensure that the driver and passengers inside the locomotive can realize the parking brake release function of the locomotive by pressing the parking brake release button S1; the emergency control circuit 1 is connected to the locomotive fire-free return control circuit through the battery output contactor Q01 as a whole, so as to ensure that when the locomotive is in normal operating mode and when a fault occurs, the emergency control circuit 1 can work normally in time to avoid safety risks.

[0043] When the locomotive is in the fireless return mode, i.e. the third end of the fireless selection switch S03 and the fourth end of the fireless selection switch S03 are conducted, the normal operation mode and the fireless return mode of the locomotive are interlocked, at this time the battery output contactor Q01 is de-energized to be opened, and the emergency bypass relay K04 is energized to be closed. Overall, the first contact S11 of the parking brake release button S1 connects the brake release circuit 2 to the fireless return control circuit of the locomotive, so as to ensure that the parking brake release function of the locomotive can be realized by the parking brake release button S1 in the locomotive by the internal driver and crew; overall, the connection between the emergency control circuit 1 and the fireless return control circuit of the locomotive is disconnected through the battery output contactor Q01 and the emergency bypass relay K04, so as to avoid the problem that the wheel wiping accident or the wheel pair overheating failure caused by the normal work of the emergency control circuit 1 in the fireless return stage of the locomotive brings great risk to the traffic safety.

[0044] The locomotive fireless return control circuit provided by the present application comprises an emergency control circuit, a brake release circuit, a fireless selection switch, an emergency bypass relay and a parking brake release button; wherein the first end of the fireless selection switch is connected with a power supply; the second end of the fireless selection switch is connected with the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the fireless selection switch is connected with the emergency control circuit; the fourth end of the fireless selection switch is connected with a battery output contactor; the first end of the second contact of the parking brake release button is connected with the emergency control circuit; the second end of the second contact of the parking brake release button is connected with the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the fireless selection switch and the second end of the fireless selection switch are conducted, the brake release circuit and the emergency control circuit are connected to the fireless return control circuit of the locomotive through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the fireless selection switch and the fourth end of the fireless selection switch are conducted, the brake release circuit is connected to the fireless return control circuit of the locomotive through the first contact of the parking brake release button, and the connection between the emergency control circuit and the fireless return control circuit of the locomotive is disconnected through the emergency bypass relay and the battery output contactor. As can be seen, the present application can realize the function selection, interlocking and independent control between the fireless return and the normal locomotive operation without optimizing the complex on-board air brake pipe, simplify the fireless return process of the driver and crew, and do not need to handle the hand release ring of the car body, which is simple and safe in operation, improves the work efficiency; at the same time, the parking brake release circuit is used to monitor the parking brake in real time during the fireless return and directly feedback to the driver, which improves the safety of vehicle operation.

[0045] On the basis of the above-mentioned embodiments, as a preferred embodiment, as Figure 2As shown, the emergency control circuit 1 includes: a first emergency loop 11, a second emergency loop 12, a first emergency relay K01 and a second emergency relay K02; the connection relationship of the circuit includes: the first end of the first emergency loop 11 is connected with the third end of the fire selection switch S03, the positive pole of the power supply 3 and the first end of the second contact S12 of the parking brake release button S1, the second end of the first emergency loop 11 is connected with the first end of the second emergency loop 12; the second end of the second emergency loop 12 is connected with the negative pole of the power supply 3; the first end of the first emergency relay K01 is connected with the second end of the first emergency loop 11 and the first end of the second emergency relay K02; the second end of the first emergency relay K01 is connected with the second end of the second emergency relay K02 and the first end of the second emergency loop 2.

[0046] As a preferred embodiment, as shown in the figure, Figure 2 As shown, the brake release circuit 2 includes: a parking brake release electromagnetic valve Y1, a parking brake release state relay K03 and a parking brake pressure switch P1. The connection relationship of the circuit is: the first end of the parking brake release electromagnetic valve Y1 is connected with the second end of the first contact S11 of the parking brake release button S1 and the first end of the second contact S12 of the parking brake release button S1, the second end of the parking brake release electromagnetic valve Y1 is connected with the first end of the parking brake release state relay K03 and the second end of the emergency bypass relay K04; the second end of the parking brake release state relay K03 is connected with the first end of the parking brake pressure switch P1; the second end of the parking brake pressure switch P1 is connected with the first end of the first contact S11 of the parking brake release button S1 and the second end of the second contact S12 of the parking brake release button S1.

[0047] In addition, in the connection relationship, the parking brake release state relay K03 also includes a contact K03-1 for connecting the emergency bypass relay K04 and the fire selection switch S03; the emergency bypass relay K04 also includes contacts K04-1, K04-2, K04-3 and K04-4, wherein K04-1 is used to connect the first emergency loop 11, the first emergency relay K01 and the second emergency relay K02; K04-2 is used to connect the first emergency relay K01, the second emergency relay K02 and the second emergency loop 12; K04-3 is used to connect the first emergency loop 11, the first emergency relay K01, the second emergency relay K02 and the positive pole of the power supply 3; K04-4 is used to connect the first emergency relay K01, the second emergency relay K02, the second emergency loop 12 and the negative pole of the power supply 3.

[0048] The overall principle of the circuit is: when the locomotive is in normal operation mode, that is, the first end of the fireless selection switch S03 and the second end of the fireless selection switch S03 are turned on, that is, the driver can place the fireless selection switch S03 in the driver's room at 0 position, at this time the battery output contactor Q01 is powered on and closed, and the emergency bypass relay K04 is powered off and opened. The parking brake release function of the locomotive is realized by pressing the second contact S12 of the parking brake release button S1 to make the parking brake release electromagnetic valve Y1 powered on, and is synchronously monitored by the parking brake pressure switch P1; since the emergency bypass relay K04 is not powered, the emergency brake circuit of the locomotive passes through the battery output contactor Q01 (+)→the first emergency loop 11→the normally closed contact (K04-1) of the emergency bypass relay K04→the first emergency relay K01 / second emergency relay K02→the normally closed contact (K04-2) of the emergency bypass relay K04→the second emergency loop 12→the battery output contactor Q01 (-), forming a closed loop control, so as to ensure that when the locomotive is in normal operation mode, the emergency control circuit 1 can work normally in time when a fault occurs, avoiding safety risks.

[0049] When the locomotive is in the fireless return mode, that is, the third end of the fireless selection switch S03 and the fourth end of the fireless selection switch S03 are turned on, that is, the driver places the fireless selection switch S03 at the fireless position 45°, the normal operation mode and the fireless return mode of the locomotive are interlocked, at this time the battery output contactor Q01 is powered off and opened, and the locomotive is automatically applied with parking brake and emergency brake due to power failure, at this time, the parking brake of the locomotive is realized by pressing the first contact S11 of the parking brake release button S1 to make the parking brake release electromagnetic valve Y1 powered on, since the locomotive is always in the parking brake release state, the parking brake pressure switch P1 remains in the closed state, then the parking brake release state relay K03 is powered on, so that the emergency bypass relay K04 is powered on, the normally closed contact (K04-1 / K04-2) of the emergency bypass relay K04 is opened, and the normally open contact (K04-3 / K04-4) of the emergency bypass relay K04 is closed, at this time the emergency bypass relay K04 and the battery output contactor Q01 disconnect the connection between the emergency control circuit 1 and the fireless return control circuit of the locomotive, avoiding the problem that when the locomotive is in the fireless return stage, the emergency control circuit is still working normally, which brings a great risk of wheel rubbing accident or wheel pair overheating fault to the train safety.

[0050] wherein, Figure 2The circuit shown in the middle further comprises a first indicator light L1, a second indicator light L2, a third indicator light L3, a first diode D1, a second diode D2, a third diode D3 and a key switch key; the circuit connection relationship is that the first end of the first indicator light L1 is connected with the first end of the second indicator light L2, the first end of the emergency bypass relay K04 and the first contact S11 of the parking brake release button S1; the second end of the first indicator light L1 and the second end of the second indicator light L2 are connected with the second end of the emergency bypass relay K04; the first end of the third indicator light L3 is connected with the first end of the fire selection switch S03 and the power supply 3, and the second end of the third indicator light L3 is connected with the second end of the emergency bypass relay K04; the positive electrode of the first diode D1 is connected with the first end of the emergency bypass relay K04, and the negative electrode of the first diode D1 is connected with the first end of the first contact S11 of the parking brake release button S1; the positive electrode of the second diode D2 is connected with the first end of the second contact S12 of the parking brake release button S1, and the negative electrode of the second diode D2 is connected with the brake release circuit 2 and the second end of the first contact S11 of the parking brake release button S1; the positive electrode of the third diode D3 is connected with the second end of the second contact S12 of the parking brake release button S1; the negative electrode of the third diode D3 is connected with the first end of the first contact S11 of the parking brake release button S1; the first end of the key switch key is connected with the fourth end of the fire selection switch S03; and the second end of the key switch key is connected with the battery output contactor Q01. The contact K03-2 in the parking brake release state relay K03 is used to connect the emergency bypass relay K04, the first indicator light L1 and the second indicator light L2.

[0051] In specific embodiments, the first diode D1, the second diode D2 and the third diode D3 are used to ensure the one-way conduction of current in the circuit, and the first indicator light L1, the second indicator light L2 and the third indicator light L3 are used to change the corresponding indicator light under the corresponding conditions, so that the driver can determine the state of the locomotive according to the state of the indicator light at the first time.

[0052] It should be noted that the embodiments provided in the present application are only one possible implementation, but are not limited to only this implementation, and can be self-set according to the needs of users.

[0053] The locomotive fireless return control circuit provided by the present application comprises: an emergency control circuit, a brake release circuit, a fireless selection switch, an emergency bypass relay and a parking brake release button; wherein the first end of the fireless selection switch is connected with a power supply; the second end of the fireless selection switch is connected with the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the fireless selection switch is connected with the emergency control circuit; the fourth end of the fireless selection switch is connected with a battery output contactor; the first end of the second contact of the parking brake release button is connected with the emergency control circuit; the second end of the second contact of the parking brake release button is connected with the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the fireless selection switch and the second end of the fireless selection switch are turned on, the brake release circuit and the emergency control circuit are connected to the locomotive fireless return control circuit through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the fireless selection switch and the fourth end of the fireless selection switch are turned on, the brake release circuit is connected to the locomotive fireless return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive fireless return control circuit is disconnected through the emergency bypass relay and the battery output contactor. Therefore, the present application can realize the function selection, interlocking and independent control between the fireless return and the normal locomotive operation without optimizing the complex on-board air brake pipe, simplifies the fireless return process of the driver, does not need to handle the hand release ring of the car body, is simple and safe to operate, and improves the work efficiency; at the same time, the parking brake release circuit is used to monitor the parking brake in real time during the fireless return and directly feedback to the driver, thereby improving the safety during the vehicle operation.

[0054] In addition, the present application also provides a vehicle comprising the above-mentioned locomotive fireless return control circuit and having the same beneficial effects.

[0055] Since the embodiments of the vehicle provided by the present application are the same as the embodiments of the locomotive fireless return control circuit provided above, the present application will not be repeated here.

[0056] The locomotive fireless return control circuit and the vehicle provided by the present application are described in detail above. The embodiments in the specification are described in a progressive manner, and each embodiment mainly describes the differences from other embodiments. The same and similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part. It should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0057] It is also to be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Furthermore, the terms "comprising," "containing," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims

1. A locomotive fire return control circuit, comprising: The emergency control circuit and brake release circuit are characterized by further comprising: a fire selection switch, an emergency bypass relay and a parking brake release button; Wherein, the first end of the no-fire selection switch is connected to the power supply; the second end of the no-fire selection switch is connected to the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected to the emergency control circuit; the fourth end of the no-fire selection switch is connected to the battery output contactor; The first end of the second contact of the parking brake release button is connected to the emergency control circuit; the second end of the second contact of the parking brake release button is connected to the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are respectively connected to the locomotive no-fire return control circuit through the second contact of the parking brake release button and the battery output contactor; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor.

2. The locomotive fire return control circuit according to claim 1, characterized in that: The emergency control circuit includes: a first emergency loop and a second emergency loop; The first end of the first emergency loop is connected to the third end of the fire-free selection switch, the positive electrode of the power supply, and the first end of the second contact of the parking brake release button, and the second end of the first emergency loop is connected to the first end of the second emergency loop; The second end of the second emergency loop is connected to the negative pole of the power supply.

3. The locomotive fire return control circuit according to claim 2, characterized in that: The emergency control circuit further comprises: a first emergency relay and a second emergency relay; wherein the first end of the first emergency relay is connected to the second end of the first emergency loop and the first end of the second emergency relay; The second end of the first emergency relay is connected to the second end of the second emergency relay and the first end of the second emergency loop.

4. The locomotive fire return control circuit according to claim 1, characterized in that: The brake relief circuit includes: a parking brake relief solenoid valve, a parking brake relief state relay and a parking brake pressure switch; Wherein, the first end of the parking brake release solenoid valve is connected to the second end of the first contact of the parking brake release button and the first end of the second contact of the parking brake release button, and the second end of the parking brake release solenoid valve is connected to the first end of the parking brake release state relay and the second end of the emergency bypass relay; The second end of the parking brake release state relay is connected to the first end of the parking brake pressure switch; The second end of the parking brake pressure switch is connected to the first end of the first contact of the parking brake release button and the second end of the second contact of the parking brake release button.

5. The locomotive fire return control circuit according to claim 1, characterized in that: Also includes: a first indicator light and a second indicator light; Wherein, the first end of the first indicator light is connected to the first end of the second indicator light, the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; The second end of the first indicator light and the second end of the second indicator light are connected to the second end of the emergency bypass relay.

6. The locomotive fire return control circuit according to claim 1, characterized in that: Also includes: The third indicator light; The first end of the third indicator light is connected to the first end of the no-fire selection switch and the power supply, and the second end of the third indicator light is connected to the second end of the emergency bypass relay.

7. The locomotive fire return control circuit according to claim 1, characterized in that: Also includes: a first diode and a second diode; The anode of the first diode is connected to the first end of the emergency bypass relay, and the cathode of the first diode is connected to the first end of the first contact of the parking brake release button; The anode of the second diode is connected to the first end of the second contact of the parking brake release button, and the cathode of the second diode is connected to the brake release circuit and the second end of the first contact of the parking brake release button.

8. The locomotive fire return control circuit according to claim 1, characterized in that: Also included: a third diode; Wherein, the anode of the third diode is connected to the second end of the second contact of the parking brake release button; The cathode of the third diode is connected to the first end of the first contact of the parking brake release button.

9. The locomotive fire return control circuit according to any one of claims 1 to 8, characterized in that: Also includes: Key switch; Wherein, the first end of the key switch is connected to the fourth end of the no-fire selection switch; The second end of the key switch is connected to the battery output contactor.

10. A means of transport, characterized in that: The locomotive fire-free return control circuit includes the locomotive fire-free return control circuit according to any one of claims 1 to 9.

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