Parking brake control system and vehicle

Abstract

This application provides a parking brake control system and a vehicle. The parking brake control system includes a main air inlet, a pair of parking brake cylinders, a pair of service brake cylinders, and a pair of braking mechanisms. Each braking mechanism includes a parking shut-off valve and a parking solenoid valve. The air inlet of the parking solenoid valve is connected to the main air inlet, the air outlet of the parking solenoid valve is connected to the air inlet of the parking shut-off valve, and the exhaust port of the parking solenoid valve is connected to the parking brake cylinder. The parking brake control system and vehicle provided in this embodiment can ensure that the parking brake cylinders can respond accurately, thereby significantly improving the safety and reliability of vehicle operation. At the same time, it realizes precise parking brake control based on a single bogie, so that the vehicle only loses the braking force of one bogie while ensuring the overall braking performance.

Description

Technical Field

[0001] This application relates to the field of parking braking technology, and more particularly to a parking braking control system and a vehicle. Background Technology

[0002] In existing rail transit vehicles, parking braking systems are an important safety measure used to ensure the stability of the vehicle when stationary, especially on slopes.

[0003] See Figure 1 A typical parking brake system includes a parking brake cylinder that generates braking force, as well as components such as a dual-pulse solenoid valve for controlling the inflation and deflation of the parking brake cylinder.

[0004] Currently, when a dual-pulse solenoid valve experiences an electrical or mechanical failure, compressed air may be unable to properly enter or leave the parking brake cylinder. In this situation, if the faulty parking brake cylinder can be isolated, the vehicle will lose some of its parking braking capability. This not only reduces the overall system's safety factor but may also prevent overloaded vehicles from safely parking on the steepest slopes.

[0005] However, in some designs, the parking brake cylinder may not have an isolation function. In this case, if the dual-pulse solenoid valve fails, the vehicle must be driven at low speed to the nearest station for repairs. During this process, the continued application of braking force by the faulty parking brake cylinder may cause unnecessary wear and damage to the wheels and rails.

[0006] Therefore, existing parking brake systems have certain limitations and safety hazards when faced with dual-pulse solenoid valve failures, especially when the faulty component cannot be effectively isolated. This indicates that there is room for improvement in current technology, and a more reliable and flexible parking brake control system needs to be developed to enhance vehicle safety performance under various conditions. Summary of the Invention

[0007] To address one of the aforementioned technical deficiencies, this application provides a parking brake control system applied to a single vehicle. The parking brake control system includes:

[0008] Main air intake,

[0009] A pair of parking brake cylinders;

[0010] A pair of commonly used brake cylinders;

[0011] A pair of braking mechanisms, each of which has an air inlet connected to the main air inlet; wherein each braking mechanism includes:

[0012] A parking shut-off valve is connected to the parking brake cylinder;

[0013] A parking solenoid valve, wherein the air inlet of the parking solenoid valve is connected to the main air inlet, the air outlet of the parking solenoid valve is connected to the air inlet of the parking shut-off valve, and the exhaust port of the parking solenoid valve is connected to the parking brake cylinder.

[0014] The parking shut-off valve is configured to disconnect the connection between the service brake cylinder and the parking solenoid valve and discharge the air in the service brake cylinder when the service brake cylinder cannot be released.

[0015] The parking solenoid valve is configured such that when the parking solenoid valve is de-energized, it connects the main air inlet to the air inlet of the parking shut-off valve; and when the parking solenoid valve is energized, it connects the exhaust port of the parking solenoid valve to the air outlet of the parking solenoid valve.

[0016] Furthermore, the braking mechanism also includes:

[0017] A pneumatic reversing valve, wherein the air inlet of the pneumatic reversing valve is connected to the air outlet of the parking solenoid valve, the air outlet of the pneumatic reversing valve is connected to the air outlet of the parking solenoid valve of another braking mechanism, and the air outlet of the pneumatic reversing valve is connected to the air inlet of the parking shut-off valve.

[0018] The pneumatic reversing valve is configured to connect the air outlet of the pneumatic reversing valve to the air outlet of the parking solenoid valve of another braking mechanism when the parking solenoid valve fails.

[0019] Furthermore, it also includes:

[0020] A one-way valve, wherein the air inlet of the one-way valve is connected to the main air inlet;

[0021] The braking mechanism further includes: a direct-flow solenoid valve, wherein the air inlet of the direct-flow solenoid valve is connected to the air outlet of the one-way valve, and the air outlet of the direct-flow solenoid valve is connected to the pre-control port of the pneumatic reversing valve.

[0022] The direct-flow solenoid valve is configured to connect the air inlet of the pneumatic directional valve to the air outlet of the parking solenoid valve when the direct-flow solenoid valve is de-energized, and to connect the exhaust port of the pneumatic directional valve to the air outlet of the pneumatic directional valve when the direct-flow solenoid valve is energized.

[0023] Furthermore, the braking mechanism further includes:

[0024] A parking pressure switch, which is connected to the parking brake cylinder and the parking shut-off valve;

[0025] The parking pressure switch is configured to monitor the operating status of the parking brake cylinder, including the application and release of braking force.

[0026] Furthermore, it also includes:

[0027] Parking brake switch;

[0028] A pair of control circuits;

[0029] The control circuit includes: a parking pressure relay, a direct-flow solenoid valve relay, and a parking solenoid valve relay.

[0030] The first electrical terminal of the parking pressure relay is grounded, the second electrical terminal of the parking pressure relay is connected to the first electrical terminal of the parking pressure switch, and the second electrical terminal of the parking pressure switch is connected to the power supply terminal.

[0031] The first electrical terminal of the direct-flow solenoid valve relay is grounded, the second electrical terminal of the direct-flow solenoid valve relay is connected to the first electrical terminal of the direct-flow solenoid valve, the second electrical terminal of the direct-flow solenoid valve is connected to the first electrical terminal of the parking pressure relay, the second electrical terminal of the parking pressure relay is connected to the first electrical terminal of the parking solenoid valve relay, and the second electrical terminal of the parking solenoid valve relay is connected to the power supply terminal.

[0032] The first electrical terminal of the parking solenoid valve relay is also grounded, and the second electrical terminal of the parking solenoid valve relay is also connected to the first electrical terminal of the parking solenoid valve. The second electrical terminal of the parking solenoid valve is connected to the power supply terminal through the parking brake switch.

[0033] Furthermore, the normally open contact of the through solenoid valve relay is connected in parallel with the normally open contact of the parking pressure relay.

[0034] Furthermore, the first electrical terminal of the parking solenoid relay is connected in series with the normally closed contact of the through solenoid relay in another control circuit.

[0035] Furthermore, the parking solenoid valve relay is a power-off delay type relay.

[0036] Furthermore, it also includes: a main air cylinder, a shut-off valve, a pressure reducing valve, a throttle valve, and a stop air cylinder connected in sequence;

[0037] The outlet of the throttle valve is connected to the inlet of the parking solenoid valve;

[0038] The air inlet of the one-way valve is connected to the air outlet of the shut-off valve.

[0039] Furthermore, the braking mechanism further includes:

[0040] A pair of braking control devices, wherein the data acquisition terminal of each braking control device is connected to the service brake cylinder and the parking brake cylinder, respectively;

[0041] The vehicle central control unit has a data receiving end connected to the data transmitting end of the braking control device, the direct solenoid valve, and the parking pressure switch.

[0042] The braking control device is configured to send the collected status information and speed information of the parked brake cylinder to the vehicle central control unit.

[0043] The vehicle central control unit is configured to output emergency braking based on the received status information of the parking brake cylinder, the speed information, and / or the pressure parameters detected by the parking pressure switch; and / or to output a fault signal of the parking solenoid valve based on the energized signal of the through solenoid valve and the operating status of the parking brake cylinder detected by the parking pressure switch.

[0044] According to a second aspect of the embodiments of this application, a vehicle is provided, including the parking braking control system described above.

[0045] The parking brake control system and vehicle provided in this embodiment of the application ensure accurate response of the parking brake cylinder under various braking conditions, thereby significantly improving the safety and reliability of vehicle operation. Furthermore, this system mechanically isolates the parking brake function of a faulty bogie. This means that when a fault occurs, the vehicle only loses the parking brake capability of that specific bogie, while the parking brake functions of other bogies remain effective, ensuring safe operation even in the face of such localized faults. This improvement achieves precise parking brake control based on a single bogie, ensuring that the vehicle only loses the braking force of one bogie while maintaining overall braking performance. Attached Figure Description

[0046] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0047] Figure 1 A prior art parking braking control system framework diagram provided for embodiments of this application;

[0048] Figure 2 A parking braking control system framework diagram provided in this application embodiment;

[0049] Figure 3Another parking braking control system framework diagram provided in this application embodiment;

[0050] Figure 4 A circuit diagram of a parking braking control system provided in this application embodiment;

[0051] Figure 5 Another circuit diagram of a parking braking control system provided in this application embodiment;

[0052] Figure 6 A circuit diagram of another parking braking control system provided in this application embodiment;

[0053] Figure 7 A framework diagram of another parking braking control system provided in the embodiments of this application;

[0054] Figure label:

[0055] 1-Main air inlet; 2-Connection interface to the first service brake cylinder; 3-Connection interface to the second service brake cylinder; 4-Connection interface to the first parking brake cylinder; 5-Connection interface to the second parking brake cylinder;

[0056] P01 - Cut-off plug;

[0057] P02 - Pressure reducing valve;

[0058] P03 - Throttling valve;

[0059] P04 - Pressure measuring point;

[0060] P12 - First pneumatic directional valve;

[0061] P22 - First pneumatic directional valve;

[0062] P11 - First direct-acting solenoid valve;

[0063] P21 - Second straight-through solenoid valve;

[0064] P15 - First parking solenoid valve;

[0065] P25 - Second parking solenoid valve;

[0066] P16 - First parking shut-off valve;

[0067] P26 - Second parking shut-off valve;

[0068] P17 - First parking pressure switch;

[0069] P27 - Second parking pressure switch;

[0070] P00 - Check valve;

[0071] A1 - Air inlet of the parking solenoid valve;

[0072] A2 - Exhaust port of the parking solenoid valve;

[0073] A3 - Air outlet of the parking solenoid valve;

[0074] B1 - Air inlet of pneumatic reversing valve;

[0075] B2 - Exhaust port of pneumatic reversing valve;

[0076] B3 - Air outlet of pneumatic reversing valve;

[0077] K17 - First parking pressure relay;

[0078] K27 - Second parking pressure relay;

[0079] K11 - First direct-acting solenoid valve relay;

[0080] K21 - Second direct-flow solenoid valve relay;

[0081] K15 - First parking solenoid valve relay;

[0082] K25 - Second parking solenoid valve relay. Detailed Implementation

[0083] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0084] To address the aforementioned issues, this application provides a parking braking control system, which can be found in the following embodiments: Figures 2-7 The parking brake control system is applied to a single vehicle. The parking brake control system includes: a main air inlet 1, a pair of parking brake cylinders, a pair of service brake cylinders, and a pair of brake mechanisms; the air inlet of each brake mechanism is connected to the main air inlet 1.

[0085] Each braking mechanism includes:

[0086] The parking shut-off valve is connected to the parking brake cylinder;

[0087] The solenoid valve is parked. Its air inlet A1 is connected to the main air inlet 1, its air outlet A3 is connected to the air inlet of the shut-off valve, and its exhaust port A2 is connected to the brake cylinder.

[0088] The parking shut-off valve is configured to disconnect the connection between the service brake cylinder and the parking solenoid valve and vent the air from the service brake cylinder when the service brake cylinder fails to release.

[0089] The parking solenoid valve is configured such that when the parking solenoid valve is de-energized, the main air inlet 1 is connected to the air inlet of the parking shut-off valve; and when the parking solenoid valve is energized, the exhaust port A2 of the parking solenoid valve is connected to the air outlet A3 of the parking solenoid valve.

[0090] Specifically, such as Figure 2 As shown, the connection interface 2 to the first service brake cylinder and the connection interface 3 to the second service brake cylinder are respectively connected to the service brake cylinders of the first bogie and the second bogie of the vehicle. In order to prevent the superposition of parking braking force and service braking force, the connection interface 4 to the first parking brake cylinder and the connection interface 5 to the second parking brake cylinder are respectively supplied with air to the parking brake cylinders of the first bogie and the second bogie of the vehicle, so as to realize the control of the parking braking function of a single bogie.

[0091] Specifically, the parking brake control system can be installed on a single vehicle, such as... Figure 2 and 7 As shown, it can be understood that a single vehicle can be equipped with a pair of bogies, namely a first bogie and a second bogie, and each bogie can be equipped with the braking mechanism described above, which is used to control the corresponding bogie. In practical applications, a brake control unit can be installed on the vehicle, and the brake control unit can include a pair of braking mechanisms. In order to simplify the description of the various components in the brake control unit, this application uses a description of a single braking mechanism to illustrate this application.

[0092] It is understandable that the two braking mechanisms in a pair of braking mechanisms can have the same components, or one braking mechanism may have more components than the other.

[0093] Each braking mechanism is connected to a single parking brake cylinder and a single service parking brake cylinder, thereby enabling control of the parking brake cylinder and the service parking brake cylinder.

[0094] Specifically, the braking mechanism may include parking shut-off valves P16 / P26. The air inlet of the parking shut-off valve may be connected to the air outlet A3 of the parking solenoid valve, and the air outlet of the parking shut-off valve may be connected to the parking brake cylinder. The parking shut-off valve can be used to isolate the compressed air upstream and discharge the compressed air in the parking brake cylinder downstream, which serves as the actuator. In some optional embodiments, the parking shut-off valve may also feed back the isolation status of the parking brake cylinder to the vehicle's central control unit (CCU), so that the CCU can control the vehicle based on the isolation status of the parking brake cylinder.

[0095] Specifically, the braking mechanism also includes a parking solenoid valve P15 / P25, which has an air inlet A1, an air outlet A3, and an exhaust port A2. The air inlet A1 is connected to the main air inlet 1, the air outlet A3 is connected to the air inlet of the parking shut-off valve, and the exhaust port A2 is connected to the brake cylinder.

[0096] In practical applications, parking brake release is achieved by opening the inlet and outlet of the parking solenoid valve when brake release is required. This allows compressed air to be injected into the parking brake cylinder from the main inlet 1 to counteract the force of the parking brake spring, thereby releasing the parking brake force output by the parking brake cylinder.

[0097] In practical applications, to prevent the superposition of braking forces: when the exhaust port and the air outlet are connected, if the vehicle is in the state of applying braking force to the service brake cylinder, the compressed air with the same pressure as the service brake cylinder enters through the exhaust port and is output to the parking brake cylinder through the air outlet to offset part of the spring force of the parking brake and prevent the superposition of parking braking force and service braking force.

[0098] In practical applications, the application of the parking brake is as follows: if the vehicle is in the service brake release state, the compressed air in the parking brake cylinder is output from the outlet to the exhaust port, and finally discharged from the exhaust port of the service brake cylinder in the brake control system (BCU), so that the spring force of the parking brake can be applied.

[0099] Through the above settings, the parking brake control system provided by the present invention ensures that the parking brake cylinder can respond correctly under different braking conditions, thereby improving the safety and reliability of vehicle operation.

[0100] Furthermore, in practical applications, the parking shut-off valve can be used to control the corresponding bogie. If the parking solenoid valve also malfunctions, causing the parking brake to fail to release, a method for manually isolating the parking brake in the event of a parking solenoid valve malfunction is proposed: When the parking solenoid valve (e.g., P15) malfunctions, causing the parking brake to fail to release, the following steps can be used to handle the fault:

[0101] Manual operation of the parking shut-off valve: First, manually operate the parking shut-off valve (e.g., P16) corresponding to the faulty bogie to cut off the air path to the parking brake cylinder and purge the compressed air from the parking brake cylinder.

[0102] Mechanical release of parking brake: Subsequently, the parking brake is mechanically released by operating the release rope of the parking brake cylinder on the faulty bogie.

[0103] By adopting the parking brake control system and vehicle design described in this application, the parking brake cylinder is ensured to respond accurately under various braking conditions, thereby significantly improving the safety and reliability of vehicle operation. Furthermore, this system also achieves mechanical isolation of the parking brake function of a faulty bogie. This means that when a fault occurs, the vehicle only loses the parking brake capability of that specific bogie, while the parking brake functions of other bogies remain effective, ensuring safe operation even in the face of such localized faults. This improvement achieves precise parking brake control based on a single bogie, ensuring that the vehicle only loses the braking force of one bogie while maintaining overall braking performance.

[0104] Based on the above embodiments, such as Figure 2 and Figure 3 In one embodiment of this specification, the braking mechanism further includes a pneumatic directional valve P12 / P22. The pneumatic directional valve P12 / P22 has an inlet B1, an outlet B3, and an exhaust B2. The inlet B1 is connected to the outlet A3 of a parking solenoid valve, the exhaust B2 is connected to the outlet A3 of a second parking solenoid valve of another braking mechanism, and the outlet B3 is connected to the inlet of a parking shut-off valve. The pneumatic directional valve P12 / P22 is configured to connect the outlet B3 of the pneumatic directional valve to the outlet A3 of the parking solenoid valve of the other braking mechanism when the parking solenoid valve P15 / P25 fails.

[0105] In practical applications, under normal operating conditions: Under normal circumstances, the air inlet B1 and outlet of the pneumatic directional valve are connected, which does not affect the normal application and release of braking force by the parking brake cylinder. If a parking solenoid valve (e.g., the first parking solenoid valve P15) malfunctions, causing the air inlet B1 and outlet B3 of the first pneumatic directional valve to become disconnected, thus preventing the parking brake of the corresponding bogie from being released, the outlet B3 and exhaust port B2 of the first pneumatic directional valve become connected. Since the exhaust port B2 of the first pneumatic directional valve is connected to the outlet A3 of the second parking solenoid valve P25 of another braking mechanism, compressed air from the other braking mechanism flows into the parking brake cylinder corresponding to the malfunctioning parking solenoid valve, thereby automatically eliminating the parking brake's inability to be released.

[0106] This specification's embodiments introduce a pneumatic reversing valve, which enables automatic release of the parking brake cylinder via a backup air circuit even in the event of a parking solenoid valve malfunction. This not only improves the system's reliability and safety but also simplifies the fault handling process, reduces maintenance costs, and enhances the system's fault redundancy capability. It ensures that the vehicle can still operate safely when critical components fail, thereby guaranteeing that the vehicle can maintain normal braking function even in the event of a single parking solenoid valve failure, thus improving driving safety.

[0107] Based on the above embodiments, such as Figure 2 and Figure 3 As shown in one embodiment of this specification, the parking brake control system further includes: a one-way valve P00, the air inlet of which is connected to the main air inlet 1.

[0108] The braking mechanism also includes: a direct-flow solenoid valve P11 / P21, the air inlet of which is connected to the air outlet of the check valve P00, and the air outlet of which is connected to the pre-control port of the pneumatic directional valve.

[0109] The straight-through solenoid valves P11 / P21 are configured such that when the straight-through solenoid valves P11 / P21 are de-energized, they connect the air inlet B1 of the pneumatic directional valve to the air outlet A3 of the parking solenoid valve, and when the straight-through solenoid valves are energized, they connect the exhaust port B2 of the pneumatic directional valve to the air outlet B3 of the pneumatic directional valve.

[0110] Specifically, in this way, the direct-acting solenoid valve can control the state of the pneumatic directional valve in different operating modes, thereby achieving redundant control of the parking braking function.

[0111] For example, if a parking solenoid valve P15 / P25 malfunctions, causing the air inlet B1 and air inlet B3 of the pneumatic directional valve to become disconnected, thus preventing the parking brake of the corresponding bogie from being released, the outlet of the direct-connect solenoid valve and the pre-control port of the pneumatic directional valve will connect. Since the exhaust port B2 of the pneumatic directional valve is connected to the exhaust port A3 of the parking solenoid valve of the other braking mechanism, compressed air from the other braking mechanism can flow into the parking brake cylinder corresponding to the malfunctioning parking solenoid valve, thereby automatically eliminating the parking brake failure and improving driving safety.

[0112] Based on the above embodiments, in one embodiment of this specification, such as Figure 2 and Figure 3 As shown, the braking mechanism also includes:

[0113] Parking pressure switches P17 / P27 are connected to the parking brake cylinder and the parking shut-off valve.

[0114] The parking pressure switches P17 / P27 are configured to monitor the operating status of the parking brake cylinder, including the application and release of braking force.

[0115] Specifically, the parking pressure switch P17 / P27 can be set with an upper pressure limit Tmax and a lower pressure limit Tmin to monitor the pressure inside the parking brake cylinder and thus provide feedback on the application and release status of the parking brake.

[0116] For example, when the pressure value in the parking brake cylinder of the first bogie reaches the upper limit value Tmax, it indicates that enough compressed air has entered the parking brake cylinder of the first bogie, and the parking brake of the bogie has been released; when the pressure value in the parking brake cylinder of the first bogie drops to the lower limit value Tmin, it indicates that the compressed air in the parking brake cylinder of the first bogie has been discharged, and the parking brake of the bogie has been applied.

[0117] In some optional embodiments, the parking pressure switch P17 / P27 can send the operating status of the parking brake cylinder to the vehicle central control unit, so that the vehicle central control unit can control the braking system to switch different control strategies based on the operating status of the parking brake cylinder.

[0118] The parking brake control system provided in this specification monitors the pressure status of the parking brake cylinder through a parking pressure switch, enabling timely feedback on the application and release status of the parking brake, thus improving the system's controllability and safety. Simultaneously, the parking pressure switch can send the operating status of the parking brake cylinder to the vehicle's central control unit (CCU), allowing the CCU to adjust its control strategy based on the real-time braking status, further enhancing the braking system's intelligence and response speed.

[0119] Based on the above embodiments, in one embodiment of this specification, such as Figure 4 , Figure 5 and Figure 6 As shown, the parking brake control system also includes: a parking brake switch; and a pair of control circuits.

[0120] Specifically, the parking brake switch can be a parking brake button, used to control the energization or de-energization of the parking solenoid valve. Under normal circumstances, the parking solenoid valves P15 / P25 are normally de-energized. In this scenario, the air inlet A1 and air outlet A3 of the parking solenoid valve are connected, allowing compressed air to enter the parking brake cylinder, thus releasing the parking brake. When the parking brake button is pressed, the parking solenoid valves P15 / P25 are energized, the air inlet A1 and air outlet A3 of the parking solenoid valve are disconnected, and the exhaust ports A2 and A3 of the parking solenoid valve are connected, allowing the compressed air in the parking brake cylinder to be discharged, thus applying the parking brake.

[0121] The control circuit includes: parking pressure relay K17 / K27, direct solenoid valve relay K11 / K21 and parking solenoid valve relay K15 / K25;

[0122] The first electrical terminal of the parking pressure relay K17 / K27 is grounded, the second electrical terminal of the parking pressure relay K17 / K27 is connected to the first electrical terminal of the parking pressure switch, and the second electrical terminal of the parking pressure switch is connected to the power supply terminal.

[0123] The first electrical terminal of the direct-acting solenoid valve relay K11 / K21 is grounded; the second electrical terminal of the direct-acting solenoid valve relay K11 / K21 is connected to the first electrical terminal of the direct-acting solenoid valve; the second electrical terminal of the direct-acting solenoid valve is connected to the first electrical terminal of the parking pressure relay K17 / K27; the second electrical terminal of the parking pressure relay K17 / K27 is connected to the first electrical terminal of the parking solenoid valve relay K15 / K25; and the second electrical terminal of the parking solenoid valve relay K15 / K25 is connected to the power supply terminal.

[0124] The first electrical terminal of the parking solenoid valve relay K15 / K25 is also grounded, and the second electrical terminal of the parking solenoid valve relay K15 / K25 is also connected to the first electrical terminal of the parking solenoid valve P15 / P25. The second electrical terminal of the parking solenoid valve P15 / P25 is connected to the power supply terminal through the parking brake switch.

[0125] Specifically, the first and second electrical terminals correspond to the positive and negative terminals of the relay, respectively. The power supply can be the vehicle's high-voltage electricity; the specific voltage level can be set as needed, for example, 110V.

[0126] For example, such as Figure 4 As shown, under normal circumstances, parking solenoid valves P15 / P25 are used to control the application and release of parking brakes on their corresponding bogies, thus controlling the parking brake function of a single bogie. When a parking solenoid valve malfunctions, this hard-wired control scheme can automatically switch the parking brake air circuit to promptly eliminate the parking brake non-release fault, as detailed below:

[0127] For example, the straight-through solenoid valves P11 / P21 are normally de-energized. When a certain parked solenoid valve P15 / If P25 malfunctions, assuming the first parking solenoid valve P15 also malfunctions, the air inlet A1 and outlet A3 of the parking solenoid valve will not be connected, and the parking brake of the first bogie will not be released. At this time, the parking pressure switch detects that the pressure is ≤Tmin, the first parking pressure relay K17 is energized, the normally open contact of the first parking pressure relay K17 closes, the first direct-acting solenoid valve P11 is energized and actuated, and the air inlet and outlet of the first direct-acting solenoid valve are connected. Correspondingly, the first pneumatic directional valve P22 is activated through the first pre-control port, connecting the air inlet B1 and outlet B3 of the first pneumatic directional valve, and switching the outlet B3 and exhaust B2 of the first pneumatic directional valve to be connected. This switches the parking brake air circuit of the first bogie to be connected to the air circuit of the second bogie, realizing the release of the parking brake and eliminating the fault. The circuit state at this time is as follows. Figure 5 As shown.

[0128] Furthermore, when the parking brake of the first bogie is released, the first parking pressure switch P17 detects that the pressure has increased to ≥Tmax, and its relay K17 is de-energized, causing the normally open contact to open, which in turn de-energizes the direct-acting solenoid valve P11. This results in the air circuit of the second bogie not being able to supply air to the first bogie. To avoid insufficient air injection into the parking brake cylinder, which would prevent the parking brake cylinder from being effectively released.

[0129] To address the problem of insufficient gas injection into the parking brake cylinder, which prevents effective release of the parking brake, in one embodiment of this specification, the normally open contact K11-a of the first direct-acting solenoid valve relay K11 in the control circuit is connected in parallel with the normally open contact of the first parking pressure relay K17. When the first parking pressure relay K17 is closed and the first direct-acting solenoid valve P11 is energized, the first direct-acting solenoid valve relay K11 is also energized, and its contact K11-a closes simultaneously, thus achieving the self-locking function of the control circuit of the first direct-acting solenoid valve P11. At this time, even if the first parking pressure relay K17 is de-energized and its normally open contact is open, the first direct-acting solenoid valve P11 will still remain energized, thereby ensuring the normal release of the parking brake of the first bogie.

[0130] In this embodiment, by connecting the normally open contacts of the parking pressure relays K17 / K27 in parallel with the control circuit of the direct-acting solenoid valve relays K11 / K21, a self-locking function is achieved so that the direct-acting solenoid valve remains energized when the parking pressure relays K17 / K27 are de-energized. This solves the problem that insufficient gas injection into the parking brake cylinder leads to ineffective release of the parking brake cylinder, ensuring that the parking brake cylinder can be fully released, and further improving the stability and reliability of the system.

[0131] Furthermore, if the first direct-acting solenoid valve P11 and the second direct-acting solenoid valve P21 in the parking brake control unit are energized simultaneously, the parking brake control air circuits of the first and second bogies will be interchanged. This would cause the parking brake control system to lose its function of eliminating parking brake failure. To avoid this problem, in one embodiment of this specification, the first electrical terminal of the direct-acting solenoid valve relays K11 / K21 is connected in series with a normally closed contact of another direct-acting solenoid valve relay K11 / K21 in another control circuit. That is, normally closed contacts (K11-b and K21-b) of the other braking mechanism's direct-acting solenoid valve relays K11 / K21 are connected in series in the control circuit of the direct-acting solenoid valves to prevent the first direct-acting solenoid valve P11 and the second direct-acting solenoid valve P21 from being energized simultaneously.

[0132] In this embodiment of the specification, by connecting the normally closed contacts of the direct-acting solenoid valve relays K11 / K21 in another braking mechanism in series in the control circuit of the direct-acting solenoid valve, the problem of interchange of the parking brake control air circuit caused by the simultaneous energization of the two direct-acting solenoid valves is effectively avoided, thus ensuring the stability and reliability of the parking brake control system.

[0133] Furthermore, such as Figure 4 , Figure 5 and Figure 6 As shown, under normal operating conditions, taking the control circuit of the first direct-acting solenoid valve P11 as an example, when the parking brake button is pressed and the parking brake is applied, the first parking solenoid valve relay K15 is energized, and its normally closed contact opens. As compressed air is discharged from the pipeline, the first parking pressure relay K17 is energized, and its normally open contact closes. If the parking brake button is pressed again, the parking brake is normally released, the first parking solenoid valve relay K15 is de-energized, and its contact closes simultaneously. At this time, the contact of the first parking pressure relay K17 remains closed, which will cause the direct-acting solenoid valve P11 to be energized and the parking brake control unit to start.

[0134] To prevent the parking brake control unit from activating when all components are functioning normally, the parking solenoid valve relays K15 / K25 are configured as power-off delay relays. That is, when the parking solenoid valve relays K15 / K25 are de-energized, their contacts remain open for 1 second. They then close after the parking pressure relays K17 / K27 open (the pressure switch detects an increase in pressure ≥ Tmax, causing the relays to de-energize). During this time, the direct-acting solenoid valve P11 remains de-energized, and the parking brake control unit will not be activated.

[0135] Understandably, the delay time of the parking solenoid valve relays K15 / K25 can be set as needed.

[0136] In this embodiment of the specification, by setting the parking solenoid valve relays K15 / K25 as power-off delay relays, the problem of erroneous activation of the parking brake control unit when all components are working normally is effectively avoided, ensuring the stability and reliability of the parking brake system under normal working conditions.

[0137] Based on the above embodiments, such as Figure 2 and Figure 3 As shown in one embodiment of this specification, the parking braking system may further include: a main air cylinder, a shut-off valve P01, a pressure reducing valve P02, a throttle valve P03, a pressure measuring point P04, and a parking air cylinder connected in sequence;

[0138] The outlet of the throttle valve P03 is connected to the inlet A1 of the parking solenoid valve;

[0139] The air inlet of the one-way valve P00 is connected to the air outlet of the shut-off valve P01.

[0140] The main air reservoir stores compressed air to provide compressed air to the braking mechanism in case of a vehicle air compressor failure; the shut-off valve P01 is used to cut off the compressed air upstream of the component during maintenance; the pressure reducing valve P02 is used to prevent damage to the parking brake cylinder due to excessive pressure; the throttle valve P03 is used to control the compressed air flow and reduce the impact on the component; the pressure measuring point P04 is used to test the pressure during maintenance; and the parking air reservoir stores compressed air to provide compressed air to the parking brake when the vehicle's total air pressure is low.

[0141] Based on the above embodiments, such as Figure 7As shown in one embodiment of this specification, the braking mechanism further includes: a pair of braking control devices, each braking control device having a data acquisition terminal connected to a parking brake cylinder and a service brake cylinder respectively; a vehicle central control unit, the vehicle central control unit having a data receiving terminal connected to a data transmitting terminal of the braking control devices, a direct-flow solenoid valve P11 / P21, and a parking pressure switch P17 / P27; the braking control devices are configured to send the acquired status information and speed information of the parking brake cylinder to the vehicle central control unit; the vehicle central control unit is configured to output emergency braking based on the received status information of the parking brake cylinder, the vehicle speed information, and / or the operating status of the parking brake cylinder detected by the parking pressure switch; and / or to output a fault signal for the parking solenoid valve based on the energized signal of the direct-flow solenoid valve P11 / P21 and the operating status of the parking brake cylinder detected by the parking pressure switch P17 / P27.

[0142] For example, such as Figure 7 As shown, each vehicle is equipped with a parking brake control unit, and each bogie is equipped with a brake control unit (BCU). The exhaust ports A2 of the two parking solenoid valves in the parking brake control unit are connected to the pipeline from the BCU to the service brake cylinder, thus preventing the superposition of the service braking force and the parking brake spring force. The exhaust ports of the two parking shut-off valves in the parking brake control unit are respectively connected to the parking brake cylinders of the two bogies, and the pressure sensor inside the BCU can monitor the parking brake cylinder pressure in real time.

[0143] For example, the brake control unit (BCU) and the parking brake control unit can feed back the status information of the parking brake cylinder, the vehicle speed information, and / or the operating status of the parking brake cylinder detected by the parking pressure switches P17 / P27 to the vehicle central control unit (CCU), so that the vehicle central control unit (CCU) can perform fault diagnosis and vehicle control.

[0144] For example, taking the first bogie as an example, when the vehicle central control unit (CCU) receives the energizing command indicating that "the straight-through solenoid valve P11 is energized" and the status command indicating that "the parking pressure switch P17 detects pressure ≥ Tmax" from the parking brake control unit, the vehicle central control unit (CCU) can confirm that the parking solenoid valve has malfunctioned. The vehicle central control unit (CCU) can prompt the driver that "the parking solenoid valve P15 is malfunctioning" through sound, vibration, or other means.

[0145] In the embodiments described in this manual, the fault diagnosis function of the vehicle's central control unit (CCU) enables precise location of faulty solenoid valves for repair and replacement, improving fault handling efficiency. Furthermore, when a faulty parking solenoid valve is confirmed, the CCU can alert the driver through sound and vibration, enhancing the driver's immediate awareness of the fault and facilitating timely intervention.

[0146] For example, fault diagnosis and vehicle control by the vehicle's central control unit (CCU) can be achieved using the following strategies:

[0147] Emergency Braking Control Strategy 1: The Brake Control Unit (BCU) monitors the parking brake cylinder pressure using a pressure sensor to determine the parking brake status. Simultaneously, the BCU can send the acquired real-time vehicle speed to the Central Control Unit (CCU), causing the CCU to output a warning signal indicating "parking brake not released." That is, when the parking brake is applied and the vehicle speed is greater than a preset speed, the CCU outputs a warning signal indicating "parking brake not released."

[0148] Emergency Braking Control Strategy Two: The vehicle's Central Control Unit (CCU) determines whether abnormal parking brake application has occurred during driving by using the vehicle's current speed and pressure switch feedback signals. Specifically, when the vehicle speed exceeds a preset speed and the pressure in the parking brake cylinder exceeds a preset pressure limit, the CCU outputs a warning signal indicating "abnormal parking brake application."

[0149] If either of the above two conditions is met, the vehicle's central control unit (CCU) will output an emergency braking command to stop the vehicle and handle the fault.

[0150] In the embodiments described in this specification, the cooperation between the BCU and CCU enables the triggering of an emergency braking command in the event of abnormal application of parking brakes, thus ensuring safety during driving.

[0151] The parking braking system has been described in detail in the above embodiments. This application also provides a vehicle that includes the parking braking system in the above embodiments, with the same effect, which will not be repeated here.

[0152] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as C, VHDL, Verilog, the object-oriented programming language Java, and the interpreted scripting language JavaScript.

[0153] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0154] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0155] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0156] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0157] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0158] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0159] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0160] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A parking braking control system, characterized in that, A parking brake control system is applied to a single vehicle, and the parking brake control system includes: Main air intake, A pair of parking brake cylinders; A pair of commonly used brake cylinders; A pair of braking mechanisms, each of which has an air inlet connected to the main air inlet; wherein each braking mechanism includes: A parking shut-off valve is connected to the parking brake cylinder; A parking solenoid valve, wherein the air inlet of the parking solenoid valve is connected to the main air inlet, the air outlet of the parking solenoid valve is connected to the air inlet of the parking shut-off valve, and the exhaust port of the parking solenoid valve is connected to the service brake cylinder. The parking shut-off valve is configured to cut off the connection between the parking brake cylinder and the parking solenoid valve and to discharge the air in the parking brake cylinder when the parking brake cylinder cannot be released. The parking solenoid valve is configured such that when the parking solenoid valve is de-energized, it connects the main air inlet to the air inlet of the parking shut-off valve; and when the parking solenoid valve is energized, it connects the exhaust port of the parking solenoid valve to the air outlet of the parking solenoid valve. The braking mechanism further includes: A pneumatic reversing valve, wherein the air inlet of the pneumatic reversing valve is connected to the air outlet of the parking solenoid valve, the air outlet of the pneumatic reversing valve is connected to the air outlet of the parking solenoid valve of another braking mechanism, and the air outlet of the pneumatic reversing valve is connected to the air inlet of the parking shut-off valve. The pneumatic reversing valve is configured to connect the air outlet of the pneumatic reversing valve to the air outlet of the parking solenoid valve of another braking mechanism when the parking solenoid valve fails.

2. The parking braking control system according to claim 1, characterized in that, Also includes: A one-way valve, wherein the air inlet of the one-way valve is connected to the main air inlet; The braking mechanism further includes: a direct-flow solenoid valve, wherein the air inlet of the direct-flow solenoid valve is connected to the air outlet of the one-way valve, and the air outlet of the direct-flow solenoid valve is connected to the pre-control port of the pneumatic reversing valve. The direct-flow solenoid valve is configured to connect the outlet of the pneumatic reversing valve to the outlet of the parking solenoid valve when the direct-flow solenoid valve is de-energized, and to connect the exhaust port of the pneumatic reversing valve to the outlet of the pneumatic reversing valve when the direct-flow solenoid valve is energized.

3. The parking braking control system according to claim 2, characterized in that, The braking mechanism further includes: A parking pressure switch, which is connected to the parking brake cylinder and the parking shut-off valve; The parking pressure switch is configured to monitor the operating status of the parking brake cylinder, including the application and release of braking force.

4. The parking braking control system according to claim 3, characterized in that, Also includes: Parking brake switch; A pair of control circuits; The control circuit includes: a parking pressure relay, a direct-flow solenoid valve relay, and a parking solenoid valve relay. The first electrical terminal of the parking pressure relay is grounded, the second electrical terminal of the parking pressure relay is connected to the first electrical terminal of the parking pressure switch, and the second electrical terminal of the parking pressure switch is connected to the power supply terminal. The first electrical terminal of the direct-flow solenoid valve relay is grounded, the second electrical terminal of the direct-flow solenoid valve relay is connected to the first electrical terminal of the direct-flow solenoid valve, the second electrical terminal of the direct-flow solenoid valve is connected to the first electrical terminal of the parking pressure relay, the second electrical terminal of the parking pressure relay is connected to the first electrical terminal of the parking solenoid valve relay, and the second electrical terminal of the parking solenoid valve relay is connected to the power supply terminal. The first electrical terminal of the parking solenoid valve relay is also grounded, and the second electrical terminal of the parking solenoid valve relay is also connected to the first electrical terminal of the parking solenoid valve. The second electrical terminal of the parking solenoid valve is connected to the power supply terminal through the parking brake switch.

5. The parking braking control system according to claim 4, characterized in that, The normally open contact of the direct-acting solenoid valve relay is connected in parallel with the normally open contact of the parking pressure relay.

6. The parking braking control system according to claim 5, characterized in that, The first electrical terminal of the direct-acting solenoid valve relay is connected in series with the normally closed contact of another direct-acting solenoid valve relay in a control circuit.

7. The parking braking control system according to any one of claims 5-6, characterized in that, The solenoid valve relay is a power-off delay type relay.

8. The parking braking control system according to any one of claims 3-6, characterized in that, The braking mechanism further includes: A pair of braking control devices, wherein the data acquisition terminal of each braking control device is connected to the service brake cylinder and the parking brake cylinder, respectively; The vehicle central control unit has a data receiving end connected to the data transmitting end of the braking control device, the direct solenoid valve, and the parking pressure switch. The braking control device is configured to send the collected status information and speed information of the parked brake cylinder to the vehicle central control unit. The vehicle central control unit is configured to output emergency braking based on the received status information of the parking brake cylinder, the speed information, and / or the pressure parameters detected by the parking pressure switch; and / or to output a fault signal of the parking solenoid valve based on the energized signal of the through solenoid valve and the operating status of the parking brake cylinder detected by the parking pressure switch.

9. A vehicle, characterized in that, Includes the parking braking control system as described in any one of claims 1-8.

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