Air brake system and engineering vehicle

Abstract

The utility model provides a kind of air brake system, including air cylinder subassembly, EPB parking brake module and brake chamber, air cylinder subassembly is connected with the air inlet of EPB parking brake module, the air outlet of EPB parking brake module is connected with brake chamber;Air brake system further includes control module and switch valve, control module is connected with switch valve, control module is used to control the opening and closing of switch valve;Switch valve is connected with the control port of EPB parking brake module;When switch valve opens, compressed gas in brake chamber can be sequentially discharged via the control port of EPB parking brake module and switch valve.The utility model further provides a kind of engineering vehicle.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to an air braking system and an engineering vehicle. Background Technology

[0002] Mining dump trucks, also known as mining transport vehicles, are a type of mining equipment primarily used for transporting ore and other bulk materials in mines. The braking system is a crucial component of mining dump trucks, significantly impacting the vehicle's safety and reliability, and directly affecting life and property safety.

[0003] Mining dump trucks generally use air braking systems, which include an electronic braking system (EBS, Electric Braking System) and an electronic parking brake system (EPB, Electrical Park Brake). These two systems work together to achieve the vehicle's braking function. The EPB system includes an EPB parking brake module (i.e., the EPB valve). When the vehicle is parked, the EPB parking brake module is energized to exhaust gas, and the compressed gas in the brake chambers of the wheels is discharged through the exhaust port of the EPB parking brake module, achieving parking braking. When the vehicle starts moving, the EPB parking brake module is energized to intake gas, and the compressed gas enters the brake chamber through the EPB parking brake module, releasing the parking brake.

[0004] However, in some extreme cases, the EPB parking brake module may fail to expel the compressed gas in the brake chamber due to unexpected situations such as power failure or blockage of the exhaust port, thus failing to achieve parking brake and affecting the safety of vehicle use. Utility Model Content

[0005] The purpose of this invention is to provide an air braking system that provides redundant parking brake function, ensuring that the EPB parking brake module can perform emergency exhaust braking even in extreme situations, thereby ensuring vehicle safety.

[0006] This utility model provides an air braking system, including an air reservoir assembly, an EPB parking brake module, and a brake chamber. The air reservoir assembly is connected to the air inlet of the EPB parking brake module, and the air outlet of the EPB parking brake module is connected to the brake chamber. The air braking system also includes a control module and a switching valve. The control module is connected to the switching valve and is used to control the opening and closing of the switching valve. The switching valve is connected to the control port of the EPB parking brake module; when the switching valve is opened, the compressed gas in the brake chamber can be discharged sequentially through the control port of the EPB parking brake module and the switching valve.

[0007] Furthermore, the air brake system also includes a pressure relief air passage, one end of which is connected to the control port of the EPB parking brake module, and the other end of which is open to the atmosphere; the switching valve is disposed on the pressure relief air passage, and the switching valve is used to open or close the pressure relief air passage. When the switch valve is opened, the compressed gas in the brake chamber can be discharged sequentially through the control port of the EPB parking brake module and the pressure relief air passage.

[0008] Furthermore, the switching valve is a normally closed valve; and / or, the switching valve is a solenoid valve.

[0009] Furthermore, the control module is an electronic control module, the switching valve is an electronically controlled valve, and the control module is electrically connected to the switching valve.

[0010] Furthermore, the control module is a manual control module, which is electrically connected to the switching valve; the manual control module is used to control the opening and closing of the switching valve based on the driver's operation.

[0011] Furthermore, the air braking system also includes an EBS service brake module, the air reservoir assembly is connected to the air inlet of the EBS service brake module, and the air outlet of the EBS service brake module is connected to the brake chamber. The control module is an automatic control module, which is electrically connected to the switching valve, the EPB parking brake module, and the EBS service brake module respectively. The automatic control module is used to control the opening and closing of the switching valve according to the communication signal and brake pressure signal of the EPB parking brake module and the EBS service brake module.

[0012] Furthermore, the air braking system also includes an EBS service brake module, an electronically controlled brake master valve, and a control unit. The air reservoir assembly is connected to the air inlet of the EBS service brake module, and the air outlet of the EBS service brake module is connected to the brake chamber. The electronically controlled brake master valve is electrically connected to the control unit, and the control unit is electrically connected to the EBS service brake module.

[0013] Furthermore, the air brake system also includes a first power supply and a second power supply. The first power supply is electrically connected to the control module and the switching valve, respectively, and the second power supply is electrically connected to the electronic brake master valve, the control unit, the EPB parking brake module and the EBS service brake module, respectively.

[0014] Furthermore, the EBS service braking module includes a front axle EBS valve and a rear axle EBS valve, the brake chamber includes a front axle brake chamber and a rear axle brake chamber, the air reservoir assembly is connected to the air inlet of the front axle EBS valve and the air inlet of the rear axle EBS valve respectively, the air outlet of the front axle EBS valve is connected to the front axle brake chamber, and the air outlet of the rear axle EBS valve is connected to the rear axle brake chamber; the control unit is electrically connected to the front axle EBS valve and the rear axle EBS valve respectively. The air braking system also includes a relay valve, and the air reservoir assembly is connected to the air inlet of the relay valve; the air outlet of the EPB parking brake module is connected to the front axle brake chamber and the control port of the relay valve respectively, and the air outlet of the relay valve is connected to the rear axle brake chamber.

[0015] This utility model also provides an engineering vehicle, including the air braking system described above.

[0016] The air brake system provided by this utility model includes a control module and a switching valve. The switching valve is connected to the control port of the EPB parking brake module, and the control module controls the opening and closing of the switching valve. In emergency situations, such as when the EPB parking brake module is unable to expel compressed gas from the brake chamber due to power failure, blockage of the exhaust port, or other unexpected circumstances, the switching valve is opened to allow the compressed gas in the brake chamber to be expelled sequentially through the control port of the EPB parking brake module and the switching valve, thereby achieving emergency parking braking. This air brake system provides redundant parking braking function, ensuring that the EPB parking brake module can perform emergency exhaust braking even in extreme situations, thus ensuring vehicle safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the air braking system in an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram showing the electrical signal connection relationship between the control module and control unit and other components in an embodiment of this utility model.

[0019] Figure 3 This is a schematic diagram showing the electrical connection relationship between the first power supply, the second power supply, and other components in an embodiment of this utility model. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0021] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0023] like Figure 1 and Figure 2 As shown, the air braking system provided in this embodiment includes an electronic braking system (EBS) and an electronic parking brake system (EPB). Specifically, the air braking system includes an air reservoir assembly 3, an EPB parking brake module 4 (i.e., an EPB valve), and a brake chamber 5. The air reservoir assembly 3 is connected to the air inlet of the EPB parking brake module 4, and the air outlet of the EPB parking brake module 4 is connected to the brake chamber 5 (specifically, to the parking chamber of the brake chamber 5). The air reservoir assembly 3 is used to store compressed gas (generally compressed air). When the EPB parking brake module 4 is working normally, when the vehicle is parked, the EPB parking brake module 4 is energized to exhaust gas, and the compressed gas in the parking chamber of the brake chamber 5 is discharged through the exhaust port of the EPB parking brake module 4 to achieve parking brake; when the vehicle starts, the EPB parking brake module 4 is energized to intake gas, and the compressed gas in the air reservoir assembly 3 enters the parking chamber of the brake chamber 5 through the EPB parking brake module 4 to achieve parking release.

[0024] The air brake system also includes a control module 41 and a switching valve 42. The control module 41 is connected to the switching valve 42 and is used to control the opening and closing of the switching valve 42. The switching valve 42 is connected to the control port of the EPB parking brake module 4. When the switching valve 42 is open, the compressed gas in the brake chamber 5 can be discharged sequentially through the control port of the EPB parking brake module 4 and the switching valve 42; when the switching valve 42 is closed, the compressed gas in the brake chamber 5 cannot be discharged through the switching valve 42.

[0025] The air brake system provided in this embodiment of the invention includes a control module 41 and a switching valve 42. The switching valve 42 is connected to the control port of the EPB parking brake module 4, and the control module 41 controls the opening and closing of the switching valve 42. In emergency situations, such as when the EPB parking brake module 4 is unable to expel compressed gas from the brake chamber 5 due to power failure, blockage of the exhaust port, or other unexpected circumstances, the switching valve 42 is opened, allowing the compressed gas in the brake chamber 5 to be expelled sequentially through the control port of the EPB parking brake module 4 and the switching valve 42, thereby achieving emergency parking braking. This air brake system provides redundant parking braking function, ensuring that the EPB parking brake module 4 can perform emergency exhaust braking even in extreme situations, thus ensuring vehicle safety.

[0026] Furthermore, such as Figure 1 As shown, in this embodiment, the switching valve 42 has a first interface and a second interface. The first interface of the switching valve 42 is connected to the control port of the EPB parking brake module 4, and the second interface of the switching valve 42 is open to the atmosphere. When the switching valve 42 is open, the first interface and the second interface of the switching valve 42 are connected, and the compressed gas in the brake chamber 5 can be discharged to the atmosphere sequentially through the control port of the EPB parking brake module 4, the first interface of the switching valve 42, and the second interface of the switching valve 42. In this embodiment, the switching valve 42 is a normally closed valve, that is, the switching valve 42 is in the closed state when the EPB parking brake module 4 is working normally, and it is only opened when the EPB parking brake module 4 fails to work normally.

[0027] Furthermore, such as Figure 1 As shown, in this embodiment, the switching valve 42 is connected to control port #4 of the EPB parking brake module 4. Specifically, control port #4 of the EPB parking brake module 4 is its own control port (this is common knowledge in the art), so this embodiment does not require any modification to the structure of the EPB parking brake module 4; a conventional EPB valve can be used. In the prior art, control port #4 of the EPB parking brake module 4 is generally not connected to other components and is normally closed to prevent compressed gas from escaping from control port #4. In this embodiment, the 4# control port of the EPB parking brake module 4 is normally open, and the opening and closing of the switching valve 42 determines whether the compressed gas can be discharged through the 4# control port and the switching valve 42. Since the 4# control port of the EPB parking brake module 4 is independent of its exhaust port, when the compressed gas cannot be discharged through its exhaust port due to unexpected situations such as power failure or exhaust port blockage, the switching valve 42 can be opened to allow the compressed gas in the brake chamber 5 to be discharged sequentially through the control port and the switching valve 42 of the EPB parking brake module 4, thereby achieving emergency parking braking.

[0028] Furthermore, such as Figure 1As shown, in this embodiment, the air brake system also includes a pressure relief air passage 40, which can specifically be an air pipe. One end of the pressure relief air passage 40 is connected to the control port of the EPB parking brake module 4, and the other end is connected to the atmosphere. A switching valve 42 is disposed on the pressure relief air passage 40, and the switching valve 42 is used to open or close the pressure relief air passage 40. When the switching valve 42 is open, the pressure relief air passage 40 is open, and the compressed gas in the brake chamber 5 can be discharged to the atmosphere sequentially through the control port of the EPB parking brake module 4 and the pressure relief air passage 40. When the switching valve 42 is closed, the pressure relief air passage 40 is closed, and the compressed gas in the brake chamber 5 cannot be discharged through the pressure relief air passage 40.

[0029] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the air braking system also includes an EBS service brake module 8 (i.e., an EBS valve), an electrically controlled brake master valve 71, and a control unit 72. The air reservoir assembly 3 is connected to the air inlet of the EBS service brake module 8, and the air outlet of the EBS service brake module 8 is connected to the brake chamber 5 (specifically, to the service cavity of the brake chamber 5). The electrically controlled brake master valve 71 is electrically connected to the control unit 72, and the control unit 72 is electrically connected to the EBS service brake module 8.

[0030] Specifically, the EBS service brake module 8 is an electro-pneumatic actuator, which can be controlled by either electrical signals or pneumatics. The EBS service brake module 8 integrates a relay valve, filter, muffler, backup circuit solenoid valve, intake solenoid valve, exhaust solenoid valve, pressure sensor, and electronic control unit (ECU). The electro-pneumatic brake master valve 71 is linked to the brake pedal (not shown). The electro-pneumatic brake master valve 71 integrates a displacement sensor to measure the pedal position and provide real-time feedback on the driver's braking requirements. The control unit 72 is the ECU of the EBS system (i.e., the EBS ECU, which is independent of other vehicle communication networks). The control unit 72 is electrically connected to the electro-pneumatic brake master valve 71 and also electrically connected to the ECU built into the EBS service brake module 8 via a CAN network. This means that the ECU built into the EBS service brake module 8 receives control signals from the EBS ECU via the CAN network to quickly respond to and control the solenoid valves and other modules within the EBS service brake module 8, thereby achieving braking of the front and rear axles. When the driver presses the brake pedal, the electronically controlled brake master valve 71 receives the pedal travel signal and transmits it to the control unit 72 to identify the vehicle's braking needs. Since the control module 41 and control unit 72 are independent control devices in this embodiment, the normal operation of the control module 41 will not be affected by unexpected situations such as power failure or damage to the control unit 72, ensuring that the switching valve 42 can open normally for emergency exhaust braking (if the control unit 72 is used to control the opening and closing of the switching valve 42, then when the EBS system malfunctions, the switching valve 42 may fail to open normally).

[0031] During service braking, when the driver depresses the brake pedal, the electronically controlled brake master valve 71 receives the pedal travel signal and transmits it to the control unit 72. The control unit 72 controls the EBS service brake module 8 to open, and compressed gas in the air reservoir assembly 3 enters the EBS service brake module 8, and then enters the brake chamber 5 to perform service braking. After braking, the driver releases the brake pedal, and the control unit 72 controls the EBS service brake module 8 to close. At the same time, the gas in the brake chamber 5 is quickly discharged through the EBS service brake module 8, thereby rapidly releasing the brakes.

[0032] Furthermore, such as Figure 1 and Figure 2As shown, in this embodiment, the EBS service brake module 8 includes a front axle EBS valve 81 and a rear axle EBS valve 82. The brake chamber 5 includes a front axle brake chamber 51 and a rear axle brake chamber 52. The air reservoir assembly 3 is connected to the air inlet of the front axle EBS valve 81 and the air inlet of the rear axle EBS valve 82, respectively. The air outlet of the front axle EBS valve 81 is connected to the front axle brake chamber 51, and the air outlet of the rear axle EBS valve 82 is connected to the rear axle brake chamber 52. The control unit 72 is electrically connected to the front axle EBS valve 81 and the rear axle EBS valve 82, respectively. The air brake system also includes a relay valve 9. The air reservoir assembly 3 is connected to the air inlet of the relay valve 9. The air outlet of the EPB parking brake module 4 is connected to the control ports of the front axle brake chamber 51 and the relay valve 9, respectively. The air outlet of the relay valve 9 is connected to the rear axle brake chamber 52.

[0033] Specifically, in this embodiment, the air tank assembly 3 includes a front vehicle air tank 31, a rear vehicle air tank 32, and a parking air tank 33. The front vehicle air tank 31 is connected to the air inlet of the front axle EBS valve 81, the rear vehicle air tank 32 is connected to the air inlet of the rear axle EBS valve 82, and the parking air tank 33 is connected to the air inlet of the EPB parking brake module 4 and the air inlet of the relay valve 9, respectively.

[0034] When the vehicle is braking, after the driver presses the brake pedal, the electronically controlled brake master valve 71 receives the pedal travel signal and transmits it to the control unit 72. The control unit 72 controls the front axle EBS valve 81 and the rear axle EBS valve 82 to open. Compressed gas in the front vehicle air reservoir 31 enters the front axle EBS valve 81 and then enters the front axle brake chamber 51 to perform front axle braking. Compressed gas in the rear vehicle air reservoir 32 enters the rear axle EBS valve 82 and then enters the rear axle brake chamber 52 to perform rear axle braking.

[0035] Furthermore, such as Figure 1 As shown, in this embodiment, there are two front axle brake chambers 51 (i.e., two front wheels). The front axle EBS valve 81 is a single-channel EBS valve, used for a single circuit for two wheels. The outlet of the front axle EBS valve 81 is connected to each of the two front axle brake chambers 51. There are four rear axle brake chambers 52 (i.e., four rear wheels). The rear axle EBS valve 82 is a dual-channel EBS valve, used for an independent dual circuit for all four wheels. The outlet of the rear axle EBS valve 82 is connected to each of the four rear axle brake chambers 52. Of course, in other embodiments, the number of front axle brake chambers 51 and rear axle brake chambers 52 can also be different. For example, if there are also two rear axle brake chambers 52, then a single-channel EBS valve can be used for the rear axle EBS valve 82.

[0036] Furthermore, such as Figure 1As shown, in this embodiment, the air outlet of the front vehicle air reservoir 31 and the air outlet of the rear vehicle air reservoir 32 are also connected to the air inlet of the electric control brake master valve 71. The air outlet of the electric control brake master valve 71 is connected to the control port of the front axle EBS valve 81 and the control port of the rear axle EBS valve 82, respectively, to form a pneumatic control braking system.

[0037] Specifically, in this embodiment, the pneumatic control braking system and the electric control braking system are installed in parallel. When the electric control braking system is working normally (i.e., the electric control braking master valve 71 can smoothly transmit electrical signals to the control unit 72, and the control unit 72 can smoothly transmit electrical signals to the EBS service brake module 8), the system control signal is an electrical signal, and the standby pneumatic control braking system is in a braking preparation state. When the electric control braking system malfunctions, braking can be performed through the pneumatic control braking system. After the driver depresses the brake pedal, the compressed gas in the front vehicle air reservoir 31 enters the electric control braking master valve 71, and then enters the front axle EBS valve 81 through the electric control braking master valve 71 to open the front axle EBS valve 81 for front axle braking; the compressed gas in the rear vehicle air reservoir 32 enters the electric control braking master valve 71, and then enters the rear axle EBS valve 82 through the electric control braking master valve 71 to open the rear axle EBS valve 82 for rear axle braking. In this embodiment, by installing a pneumatic control braking system and an electric control braking system in parallel, the pneumatic control braking system can ensure normal braking of the vehicle when the electric control braking system fails, thereby improving the vehicle's safety performance.

[0038] Furthermore, such as Figure 1 and Figure 2As shown, in this embodiment, the air braking system also includes an EPB switch 43, which is electrically connected to the EPB parking brake module 4. Specifically, the EPB parking brake module 4 integrates a built-in ECU, an intake solenoid valve, an exhaust solenoid valve, a relay valve, and other structures and functions. The EPB switch 43 is electrically connected to the ECU built into the EPB parking brake module 4. The EPB switch 43 outputs different control signals to the ECU built into the EPB parking brake module 4 in different states. The ECU built into the EPB parking brake module 4 controls the solenoid valves and other modules within the EPB parking brake module 4 according to the state of the EPB switch 43, thereby responding to the driver's needs. At the same time, the EPB parking brake module 4 is electrically connected to the control unit 72 via a CAN network. The control unit 72 receives the parking signal from the EPB parking brake module 4 to prevent brake overlap. When the vehicle is parked, the driver pulls up the EPB switch 43 (similar to the electronic parking brake of a car), which powers the EPB parking brake module 4 to release the gas. The compressed gas in the parking chamber of the front axle brake chamber 51, which is directly connected to the EPB parking brake module 4, is vented. At the same time, the compressed gas in the control port of the relay valve 9 is vented, causing the relay valve 9 to close. The compressed gas in the parking chamber of the rear axle brake chamber 52, which is connected to the relay valve 9, is vented through the outlet of the relay valve 9, thereby achieving parking braking. When the driver pushes down the EPB switch 43 or presses the accelerator, the EPB parking brake module 4 is energized and air is introduced. At the same time, the relay valve 9 opens, and compressed gas enters the parking chambers of the front axle brake chamber 51 and the rear axle brake chamber 52 through the EPB parking brake module 4 and the relay valve 9, thereby releasing the parking brake. (Parking brakes generally use spring brakes. After the compressed gas in the brake chamber 5 is discharged, the spring (not shown in the figure) in the brake chamber 5 extends, and under the action of the spring force, a braking force is generated, thereby realizing the parking brake. Conversely, when the brake chamber 5 is filled with air, the spring shortens, and the braking force generated by the spring disappears, thereby releasing the parking brake. For the technology of spring brakes, please refer to the existing technology, which will not be described in detail here.)

[0039] It should be noted that when the EPB parking brake module 4 is working properly, the parking brake is generally applied by controlling the EPB switch 43; only when the EPB parking brake module 4 is not working properly will the emergency parking brake be applied by the switch valve 42.

[0040] Furthermore, such as Figure 1As shown, in this embodiment, the air braking system further includes an air compressor 1 and an air handling unit 2. The air outlet of the air compressor 1 is connected to the air inlet of the air handling unit 2 via a high-temperature hose and a steel pipe. The air outlet of the air handling unit 2 is connected to the air storage tank assembly 3 (the air outlet of the air handling unit 2 is connected to the front vehicle air storage tank 31, the rear vehicle air storage tank 32, and the parking air storage tank 33, respectively). The air compressor 1 is used to generate compressed air. The air handling unit 2 includes an air dryer, a four-circuit protection valve, and other structures. The air dryer is used to clean and dry the compressed air, and the four-circuit protection valve is used to deliver the compressed air to each air storage tank respectively.

[0041] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the control module 41 is an electronic control module, and the switching valve 42 is an electronically controlled valve. The control module 41 is electrically connected to the switching valve 42, and the control module 41 controls the opening and closing of the switching valve 42 by sending an electrical signal to the switching valve 42. Specifically, in this embodiment, the switching valve 42 is a solenoid valve; more specifically, the switching valve 42 is a two-position three-way solenoid valve. Of course, in other embodiments, the switching valve 42 can also be a pneumatically controlled valve, and the control module 41 can also be a pneumatically controlled module.

[0042] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the control module 41 is an automatic control module, which is electrically connected to the switching valve 42, the EPB parking brake module 4, and the EBS service brake module 8. The automatic control module is used to automatically control the opening and closing of the switching valve 42 based on the communication signals and brake pressure signals from the EPB parking brake module 4 and the EBS service brake module 8. Specifically, the automatic control module can be an ECU, MCU, PLC, or other components with logic operations and automatic control capabilities.

[0043] Specifically, in this embodiment, the conditions under which the control module 41 controls the switch valve 42 to open automatically are: communication interruption of the EPB parking brake module 4, communication interruption of the EBS service brake module 8, abnormal brake pressure signal of the EPB parking brake module 4 (e.g., service brake pressure below a safety threshold), and abnormal brake pressure signal of the EBS service brake module 8. Specifically, the control module 41 receives and collects the communication signals of the EPB parking brake module 4, the EBS service brake module 8, the service brake pressure signal of the EPB parking brake module 4, and the parking brake pressure signal of the EBS service brake module 8 in real time. When all four are abnormal, the control module 41 determines that the system is in a double-failure state (i.e., both the EBS system and the EPB system are failed). At this time, the control module 41 automatically controls the switch valve 42 to open, performing emergency exhaust braking.

[0044] In another embodiment, the control module 41 is a manual control module, which is electrically connected to the switching valve 42. The manual control module is used to control the opening and closing of the switching valve 42 based on the driver's operation. Specifically, when the driver finds that the vehicle cannot perform service braking and parking braking while pressing the brake pedal and operating the EPB switch 43, it can be determined that the system is in a double failure state (i.e., both the EBS system and the EPB system are failed). At this time, the driver can manually operate the control module 41 to control the switching valve 42 to open for emergency exhaust braking. The manual control module can be a rotary switch, a button switch, a touch switch, etc. Of course, in other embodiments, the control module 41 may also include both an automatic control module and a manual control module, so that the switching valve 42 can be opened and closed automatically and manually.

[0045] Furthermore, such as Figures 1 to 3 As shown, in this embodiment, the air brake system also includes a first power supply 61 and a second power supply 62. The first power supply 61 is electrically connected to the control module 41 and the switching valve 42, respectively, and is used to supply power to the control module 41 and the switching valve 42. The second power supply 62 is electrically connected to the electronically controlled brake master valve 71, the control unit 72, the EPB parking brake module 4, and the EBS service brake module 8, respectively, and is used to supply power to the electronically controlled brake master valve 71, the control unit 72, the EPB parking brake module 4, and the EBS service brake module 8. By using an independent first power supply 61 to power the control module 41 and the switching valve 42, it can be ensured that the control module 41 and the switching valve 42 can still work normally when the EBS system and the EPB system fail, thereby ensuring vehicle safety.

[0046] This embodiment also provides an engineering vehicle, including the air braking system described above. The engineering vehicle includes, but is not limited to, mining dump trucks, tractor trucks, cranes, etc.

[0047] The advantages of the air braking system in this embodiment include: 1. By setting up control module 41 and switching valve 42, redundant parking brake function is realized, ensuring that EPB parking brake module 4 can perform emergency exhaust braking in extreme situations, thereby ensuring vehicle safety and meeting the redundancy design requirements of ASIL-B safety integrity level in ISO26262 international standard.

[0048] 2. The hardware modification cost is low. Only an additional control module 41, switching valve 42 and first power supply 61 need to be set up. There is no need to modify the original vehicle air circuit and ECU control program, which reduces the technical modification cost.

[0049] 3. The first power supply 61 is used to provide independent power, so that the control module 41 and the switching valve 42 can still work normally when the EBS system and EPB system fail, thereby ensuring vehicle safety.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A pneumatic braking system, comprising an air reservoir assembly (3), an EPB parking brake module (4), and a brake chamber (5), wherein the air reservoir assembly (3) is connected to the air inlet of the EPB parking brake module (4), and the air outlet of the EPB parking brake module (4) is connected to the brake chamber (5), characterized in that, The air braking system also includes a control module (41) and a switching valve (42). The control module (41) is connected to the switching valve (42), and the control module (41) is used to control the opening and closing of the switching valve (42). The switching valve (42) is connected to the control port of the EPB parking brake module (4); when the switching valve (42) is opened, the compressed gas in the brake chamber (5) can be discharged sequentially through the control port of the EPB parking brake module (4) and the switching valve (42).

2. The air braking system as described in claim 1, characterized in that, The air brake system also includes a pressure relief air passage (40), one end of which is connected to the control port of the EPB parking brake module (4), and the other end of which is connected to the atmosphere; the switch valve (42) is provided on the pressure relief air passage (40), and the switch valve (42) is used to open or close the pressure relief air passage (40). When the switch valve (42) is opened, the compressed gas in the brake chamber (5) can be discharged sequentially through the control port of the EPB parking brake module (4) and the pressure relief air passage (40).

3. The air braking system as described in claim 1, characterized in that, The switching valve (42) is a normally closed valve; and / or, the switching valve (42) is a solenoid valve.

4. The air braking system as described in claim 1, characterized in that, The control module (41) is an electric control module, and the switching valve (42) is an electric control valve. The control module (41) is electrically connected to the switching valve (42).

5. The air braking system as described in claim 4, characterized in that, The control module (41) is a manual control module, which is electrically connected to the switch valve (42); the manual control module is used to control the opening and closing of the switch valve (42) based on the driver's operation.

6. The air braking system as described in claim 4, characterized in that, The air braking system also includes an EBS service brake module (8), the air reservoir assembly (3) is connected to the air inlet of the EBS service brake module (8), and the air outlet of the EBS service brake module (8) is connected to the brake chamber (5). The control module (41) is an automatic control module, which is electrically connected to the switch valve (42), the EPB parking brake module (4) and the EBS service brake module (8) respectively. The automatic control module is used to control the opening and closing of the switch valve (42) according to the communication signal and brake air pressure signal of the EPB parking brake module (4) and the EBS service brake module (8).

7. The air braking system as described in any one of claims 1-6, characterized in that, The air braking system also includes an EBS service brake module (8), an electronically controlled brake master valve (71), and a control unit (72). The air reservoir assembly (3) is connected to the air inlet of the EBS service brake module (8), and the air outlet of the EBS service brake module (8) is connected to the brake chamber (5). The electronically controlled brake master valve (71) is electrically connected to the control unit (72), and the control unit (72) is electrically connected to the EBS service brake module (8).

8. The air braking system as described in claim 7, characterized in that, The air brake system also includes a first power supply (61) and a second power supply (62). The first power supply (61) is electrically connected to the control module (41) and the switching valve (42) respectively. The second power supply (62) is electrically connected to the electric brake master valve (71), the control unit (72), the EPB parking brake module (4) and the EBS service brake module (8) respectively.

9. The air braking system as described in claim 7, characterized in that, The EBS service brake module (8) includes a front axle EBS valve (81) and a rear axle EBS valve (82). The brake chamber (5) includes a front axle brake chamber (51) and a rear axle brake chamber (52). The air reservoir assembly (3) is connected to the air inlet of the front axle EBS valve (81) and the air inlet of the rear axle EBS valve (82) respectively. The air outlet of the front axle EBS valve (81) is connected to the front axle brake chamber (51), and the air outlet of the rear axle EBS valve (82) is connected to the rear axle brake chamber (52). The control unit (72) is electrically connected to the front axle EBS valve (81) and the rear axle EBS valve (82) respectively. The air brake system also includes a relay valve (9), and the air reservoir assembly (3) is connected to the air inlet of the relay valve (9); the air outlet of the EPB parking brake module (4) is connected to the front axle brake chamber (51) and the control port of the relay valve (9) respectively, and the air outlet of the relay valve (9) is connected to the rear axle brake chamber (52).

10. An engineering vehicle, characterized in that, Includes the air braking system as described in any one of claims 1-9.

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