Brake-by-wire system and wide-body mining dump truck

Abstract

The invention belongs to the technical field of vehicle braking, and particularly relates to a brake-by-wire system and a wide-body mining dump truck, which comprise an air supply unit, a multi-loop protection valve, a braking execution unit, a pair of front axle braking air chambers, a plurality of pairs of middle and rear axle braking air chambers, a front axle braking loop, a front axle air cylinder, a single-channel EBS valve and a middle and rear axle braking loop, comprising a middle-rear axle air cylinder, a multi-channel EBS valve, a service brake valve and an electromagnetic relay valve. The electromagnetic relay valve is arranged, the air inlet is communicated with the middle and rear axle air storage cylinder, the first air outlet is communicated with the control port of the single-channel EBS valve, and the second air outlet is communicated with the control port of the multi-channel EBS valve, so that an air braking safety system and an electronic braking safety system are combined, and the automatic braking auxiliary function is achieved; the braking system can actively brake when encountering sudden dangerous situations or the distance between the braking system and a front vehicle and pedestrians is smaller than the safe distance, and therefore the performance and safety of the braking system are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle braking, and in particular relates to a brake-by-wire system and a wide-body mining dump truck. Background Art

[0002] At present, the braking system of heavy-duty vehicles usually adopts pneumatic braking system, which is particularly suitable for the use scenarios and needs of heavy-duty vehicles, mainly due to the following advantages: 1. Strong braking force: It can generate high air pressure intensity, thus generating sufficient braking force to ensure that heavy-loaded vehicles can quickly slow down or stop in an emergency, which is an important guarantee for safe driving; 2. Sensitive response: It can generate huge braking force in a short time, solving the problem of relatively long braking distance caused by large inertia of heavy-loaded vehicles and improving driving safety; 3. Simple structure and easy maintenance: It helps to reduce manufacturing and maintenance costs, and reduces the difficulty of repair. It is suitable for long-distance driving and high-intensity load working environments; 4. Strong adaptability: It can adapt to various harsh environmental conditions, such as high temperature, high pressure, high humidity, etc., and meet the needs of heavy-duty vehicles to work in various complex environments; 5. High safety: Its medium is compressed air, which will not burn, so it has high safety, and faults are usually obvious, such as insufficient air pressure or pipeline leakage, which is easy to find and repair in time.

[0003] In the existing pneumatic brake system, the driver switches the working position of the service brake valve by stepping on the brake pedal, so that compressed air flows to the service cavity of each brake air chamber through the front axle brake circuit and the middle and rear axle brake circuit, thereby realizing manual braking.

[0004] However, the above-mentioned pneumatic brake system does not have an automatic brake assist function and cannot actively brake when encountering sudden dangerous situations or when the distance to the vehicle in front and pedestrians is less than the safe distance, resulting in a problem of low driving safety. Summary of the invention

[0005] The purpose of the present invention is to provide a wire-controlled braking system and a wide-body mining dump truck, which solves the problem that the prior art cannot actively brake when encountering sudden dangerous situations or the distance to the vehicle in front and pedestrians is less than the safe distance, and there is a technical problem of low driving safety.

[0006] In a first aspect, the present invention discloses a brake-by-wire system, comprising: Air supply unit; A multi-circuit protection valve, the air inlet of which is connected to the air supply unit; Brake actuation unit, including A pair of front axle brake chambers, Multiple pairs of center and rear axle brake chambers; Front axle brake circuit, including The front axle air reservoir is connected to the first air outlet of the multi-circuit protection valve. A single-channel EBS valve, the air inlet of which is connected to the front axle air reservoir, and the two air outlets of which are respectively connected to the driving chamber of one of the front axle brake air chambers; Center and rear axle brake circuit, including The middle and rear axle air reservoir is connected to the second air outlet of the multi-circuit protection valve. A multi-channel EBS valve, the air inlets of which are all connected to the mid-rear axle air reservoir, and the air outlets of which are each connected to a driving cavity of a mid-rear axle brake air chamber; A service brake valve, wherein the first air inlet is connected to the front axle air reservoir, the second air inlet is connected to the middle and rear axle air reservoirs, the first air outlet is connected to the control port of the single-channel EBS valve, and the second air outlet is connected to the control port of the multi-channel EBS valve; The electromagnetic relay valve has an air inlet connected to the mid-rear axle air reservoir, a first air outlet connected to the control port of the single-channel EBS valve, and a second air outlet connected to the control port of the multi-channel EBS valve.

[0007] The present application combines the pneumatic braking and electronic braking safety systems by setting an electromagnetic relay valve, connecting the air inlet with the mid-rear axle air reservoir, connecting the first air outlet with the control port of the single-channel EBS valve, and connecting the second air outlet with the control port of the multi-channel EBS valve. The automatic braking assist function can be used to actively brake when encountering sudden dangerous situations or when the distance to the vehicle in front and pedestrians is less than the safe distance, thereby improving the performance and safety of the braking system.

[0008] On the basis of the above technical solution, the solution of this application can also be improved as follows: Preferably, the front axle brake circuit further includes: Two ABS valves are connected in series one by one between the driving cavity of the front axle brake air chamber and the air outlet of the single-channel EBS valve; adopting this solution, the flow and pressure of compressed air can be accurately controlled to prevent the wheels from locking during braking, thereby improving the braking performance and driving safety of the vehicle.

[0009] Preferably, it also includes: A first shuttle valve, wherein a first air inlet is connected to a first air outlet of the service brake valve through a pipeline, a second air inlet is connected to a first air outlet of the electromagnetic relay valve through a pipeline, and an air outlet is connected to a control port of the single-channel EBS valve through a pipeline; The second shuttle valve, the first air inlet is connected with the second air outlet of the service brake valve through a pipeline, the second air inlet is connected with the second air outlet of the electromagnetic relay valve through a pipeline, and the air outlet is connected with the control port of the multi-channel EBS valve through a pipeline; by adopting this solution, the pressure of the compressed air entering the control port of the single-channel EBS valve and the multi-channel EBS valve can be controlled by adjusting the opening size of the valve, so that the braking system can provide appropriate braking force according to actual needs to ensure the stability and reliability of braking.

[0010] Preferably, it also includes: Parking brake circuit, including The parking air reservoir is connected to the third air outlet of the multi-circuit protection valve. The EPB control valve has an air inlet connected to the parking air reservoir, and a second air outlet connected to the parking chambers of a pair of front axle brake air chambers. An air-controlled relay valve, wherein the air inlet is connected to the parking air cylinder, the control port is connected to the first air outlet of the EPB control valve, and each air outlet is connected to a parking cavity of a pair of middle and rear axle brake air chambers. By adopting this solution, pneumatic control of the parking brake can be performed through electronic instructions, which improves the response speed and accuracy of the system, reduces the complexity and maintenance cost of the system, and can provide a more intelligent and safe parking brake experience by working in collaboration with other electronic systems.

[0011] Preferably, the parking brake circuit comprises The air inlet of the electromagnetic switch valve is connected to the control port of the EPB control valve; by adopting this solution, an automatic parking assist function is provided, so that the control system can actively brake, which is particularly important in emergency avoidance or sudden failure, and can greatly improve the safety of the vehicle.

[0012] Preferably, it also includes: Auxiliary brake circuit, including The auxiliary air storage cylinder is connected to the fourth air outlet of the multi-circuit protection valve. The air inlet of the pressure reducing valve is connected to the auxiliary air storage cylinder. The air inlet of the multi-way control valve is connected to the air outlet of the pressure reducing valve. Multiple opening and closing valves, the air inlet is connected to the air outlet of the pressure reducing valve; by adopting this solution, a highly integrated system is formed, thereby reducing the complexity and maintenance cost of the system, and realizing independent control of different auxiliary braking components, so that the system can adapt to different road conditions.

[0013] Preferably, the air supply unit includes an air compressor, a spiral heat pipe, a condenser and a dryer connected in sequence; by adopting this solution, an efficient and stable compressed air supply is achieved, and the temperature of the compressed air can be effectively reduced, thereby avoiding deformation of subsequent components due to thermal expansion, and even mechanical failure and leakage, thereby improving operational stability.

[0014] Preferably, the air supply unit also includes a condenser and a dryer connected in series between the spiral heat dissipation tube and the multi-circuit protection valve; adopting this solution can ensure that dry and pure compressed air is obtained, protect various components from corrosion and damage, extend the service life of the equipment, thereby ensuring the stability and reliability of the pneumatic system, and enabling the system to operate normally for a long time.

[0015] Preferably, two pairs of mid-rear axle brake air chambers are provided; adopting this solution can provide stable drive and ensure driving stability.

[0016] In a second aspect, the present invention discloses a wide-body mining dump truck, comprising the brake-by-wire system described in any one of the above items.

[0017] Through the above technical solution, the present invention achieves the following beneficial effects: 1. The present application combines the air pressure brake and the electronic brake safety system by setting an electromagnetic relay valve, connecting the air inlet with the middle and rear axle air reservoir, connecting the first air outlet with the control port of the single-channel EBS valve, and connecting the second air outlet with the control port of the multi-channel EBS valve. This provides an automatic brake assist function, which can actively brake when encountering sudden dangerous situations or when the distance to the vehicle in front and pedestrians is less than the safe distance, thereby improving the performance and safety of the brake system; 2. The present application can accurately control the flow and pressure of compressed air by setting an ABS valve, thereby preventing the wheels from locking during braking, thereby improving the braking performance and driving safety of the vehicle; 3. By setting the first shuttle valve and the second shuttle valve, the present application can control the pressure of the compressed air entering the control port of the single-channel EBS valve and the multi-channel EBS valve by adjusting the opening size of the valve, so that the braking system can provide appropriate braking force according to actual needs and ensure the stability and reliability of braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of a brake-by-wire system according to a specific embodiment of the present invention; Description of reference numerals: 1. Air supply unit; 2. Multi-circuit protection valve; 3. Brake execution unit; 4. Front axle brake circuit; 5. Middle and rear axle brake circuit; 6. Service brake valve; 7. Solenoid relay valve; 8. First shuttle valve; 9. Second shuttle valve; 10. Parking brake circuit; 11. Auxiliary brake circuit; 101. Air compressor; 102. Spiral heat pipe; 103. Condenser; 104. Dryer; 301. Front axle brake air chamber; 302. Middle and rear axle brake air chamber; 401. Front axle air reservoir; 402. Single-channel EBS valve; 403. ABS valve; 501. Middle and rear axle air reservoir; 502. Multi-channel EBS valve; 1001. Parking air reservoir; 1002. EPB control valve; 1003. Solenoid switch valve; 1004. Air-controlled relay valve; 1101. Auxiliary air reservoir; 1102. Pressure reducing valve; 1103. Multi-way control valve; 1104. Opening and closing valve. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0021] First of all, it should be noted that in the following description, some directional words involved in order to clearly illustrate the technical solution of the present invention, such as the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., are all meanings that are inferred from the normal directions of components in the wire control brake system and the wide-body mining dump truck. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example: like Figure 1 As shown, an embodiment of the present application discloses a wire control braking system for a braking system of a heavy vehicle, and its specific structure includes: an air supply unit 1, a multi-circuit protection valve 2, a brake execution unit 3, a front axle brake circuit 4, a middle and rear axle brake circuit 5, a service brake valve 6 and an electromagnetic relay valve 7.

[0026] The air supply unit 1 provides compressed air for the entire braking system and is the source of braking force.

[0027] The multi-circuit protection valve 2 can ensure the safety of the braking system. When a circuit fails, it can isolate the circuit to prevent brake failure. Its air inlet is connected to the air supply unit 1 to provide compressed air for subsequent braking circuits.

[0028] The brake execution unit 3 comprises: A pair of front axle brake air chambers 301 for generating braking force on the wheels of the front axle; A plurality of pairs of center and rear axle brake air chambers 302 are used to generate braking force on the wheels of the center axle and the rear axle.

[0029] Front axle brake circuit 4 includes: The front axle air reservoir 401 is connected to the first air outlet of the multi-circuit protection valve 2 and is used to store compressed air; The single-channel EBS valve 402 has an air inlet connected to the front axle air reservoir 401 and two air outlets connected to the driving chamber of a front axle brake air chamber 301 respectively, and is used to control the driving braking force of the front axle brake air chamber 301 .

[0030] The central and rear axle brake circuit 5 includes: The middle and rear axle air storage cylinder 501 is connected to the second air outlet of the multi-circuit protection valve 2 and is used to store compressed air; The multi-channel EBS valve 502 has air inlets connected to the mid-rear axle air reservoir 501 , and each air outlet is connected to a driving cavity of a mid-rear axle brake air chamber 302 , so as to control the driving braking force of the mid-rear axle brake air chamber 302 .

[0031] Preferably, each air inlet of the multi-channel EBS valve 502 corresponds to two air outlets, and the two air outlets are connected to the driving cavity of the same pair of rear axle brake air chambers 302; this makes the air supply control between each pair of rear axle brake air chambers 302 independent of each other, so that when a branch fails, the branch can be isolated to prevent complete brake failure, thereby improving safety.

[0032] The first air inlet of the service brake valve 6 is connected to the front axle air reservoir 401, the second air inlet is connected to the middle and rear axle air reservoirs 501, the first air outlet is connected to the control port of the single-channel EBS valve 402, and the second air outlet is connected to the control port of the multi-channel EBS valve 502, which is used to control the closing and release of the service braking force.

[0033] The air inlet of the electromagnetic relay valve 7 is connected to the mid-rear axle air reservoir 501, the first air outlet is connected to the control port of the single-channel EBS valve 402, and the second air outlet is connected to the control port of the multi-channel EBS valve 502. It serves as an auxiliary brake control valve, which is used to control the start of the single-channel EBS valve 402 and the multi-channel EBS valve 502 after receiving an electrical signal.

[0034] It should be noted that in order to more clearly explain the working mode of each component, Figure 1 In the figure: a is the air inlet, a1~a2 are the first air inlet to the second air inlet; b is the air outlet, b1~b6 are the first air outlet to the sixth air outlet; c is the exhaust port; d is the control port.

[0035] The working principle of the above technical solution is as follows: During operation, the air supply unit 1 provides compressed air to the front axle brake circuit 4 through the first air outlet of the multi-circuit protection valve 2, and provides compressed air to the middle and rear axle air cylinders 501 through the second air outlet of the multi-circuit protection valve 2. They are isolated from each other to prevent brake failure.

[0036] When the driver steps on the brake pedal, the brake pedal controls the service brake valve 6 to switch positions, so that the first air inlet of the service brake valve 6 is connected to the first air outlet, and the second air inlet is connected to the second air outlet. At this time, the manual braking process is as follows: In the front axle brake circuit 4, the compressed air first enters the front axle air reservoir 401 through the pipeline, and then enters the air inlet of the single-channel EBS valve 402 and the first air inlet of the service brake valve 6 through the pipeline. At this time, since the first air inlet of the service brake valve 6 is connected with the first air outlet, the compressed air will enter the control port of the single-channel EBS valve 402, so that the valve of the single-channel EBS valve 402 is opened, so that the air inlet of the single-channel EBS valve 402 is connected with the first air outlet and the second air outlet. Therefore, the compressed air can enter the driving chambers of the two front axle brake air chambers 301 respectively, and finally generate braking force on the wheels of the front axle; In the center-rear axle brake circuit 5, the compressed air first enters the center-rear axle air reservoir 501 through the pipeline, and then enters the air inlet of the multi-channel EBS valve 502 and the second air inlet of the service brake valve 6 through the pipeline. At this time, since the second air inlet of the service brake valve 6 is connected with the second air outlet, the compressed air will enter the control port of the multi-channel EBS valve 502, so that the valve of the multi-channel EBS valve 502 is opened, so that the air inlet of the multi-channel EBS valve 502 is connected with a pair of first air outlets and second air outlets, and the air inlet of the multi-channel EBS valve 502 is connected with another pair of first air outlets and second air outlets. Therefore, the compressed air can enter the driving cavities of the two pairs of center-rear axle brake air chambers 302 respectively, and finally generate braking force on the wheels of the center axle and the rear axle.

[0037] When encountering an unexpected dangerous situation, or when the upper-level sensing equipment (such as radar, camera, etc.) measures that the distance between the vehicle and the vehicle in front or pedestrians is less than the safe distance, the control system sends an electrical signal to the electromagnetic relay valve 7, thereby opening the valve of the electromagnetic relay valve 7, so that the air inlet of the electromagnetic relay valve 7 is connected with the first air outlet and the second air outlet, so that the compressed air enters the air inlet of the electromagnetic relay valve 7 through the pipeline from the middle and rear axle air cylinder 501, and then flows through the electromagnetic relay valve 7 to the control port of the single-channel EBS valve 402 and the control port of the multi-channel EBS valve 502, so that the valves of the two are opened, and the vehicle will perform emergency driving braking.

[0038] The present invention arranges an electromagnetic relay valve 7, and connects the air inlet with the middle and rear axle air reservoir 501, connects the first air outlet with the control port of the single-channel EBS valve 402, and connects the second air outlet with the control port of the multi-channel EBS valve 502, thereby combining the pneumatic braking and electronic braking safety systems, thereby having an automatic brake assist function, and can actively brake when encountering sudden dangerous situations or the distance to the vehicle in front and pedestrians is less than the safe distance, thereby improving the performance and safety of the braking system.

[0039] In some embodiments, Figure 1 As shown, the front axle brake circuit 4 also includes: Two ABS valves 403 are connected in series one by one between the driving chamber of the front axle brake air chamber 301 and the air outlet of the single-channel EBS valve 402 .

[0040] By providing the ABS valve 403, the flow and pressure of the compressed air can be accurately controlled, thereby preventing the wheels from locking during braking, thereby improving the braking performance and driving safety of the vehicle.

[0041] In some embodiments, Figure 1 As shown, it also includes: The first shuttle valve 8 has a first air inlet connected to the first air outlet of the service brake valve 6 through a pipeline, a second air inlet connected to the first air outlet of the electromagnetic relay valve 7 through a pipeline, and an air outlet connected to the control port of the single-channel EBS valve 402 through a pipeline; The second shuttle valve 9 has a first air inlet connected to the second air outlet of the service brake valve 6 through a pipeline, a second air inlet connected to the second air outlet of the electromagnetic relay valve 7 through a pipeline, and an air outlet connected to the control port of the multi-channel EBS valve 502 through a pipeline.

[0042] Through the above arrangement, the pressure of the compressed air entering the control ports of the single-channel EBS valve 402 and the multi-channel EBS valve 502 can be controlled by adjusting the opening of the valve, so that the braking system can provide appropriate braking force according to actual needs to ensure braking stability and reliability.

[0043] In some embodiments, Figure 1 As shown, it also includes: a parking brake circuit 10, which includes The parking air reservoir 1001 is connected to the third air outlet of the multi-circuit protection valve 2 and is used to store compressed air; The EPB control valve 1002 has an air inlet connected to the parking air reservoir 1001 and a second air outlet connected to the parking chamber of a pair of front axle brake air chambers 301, and is used to control the closing and releasing of the parking brake force; The air-controlled relay valve 1004 has an air inlet connected to the parking air cylinder 1001, a control port connected to the first air outlet of the EPB control valve 1002, and each air outlet is connected to a parking cavity of a pair of middle and rear axle brake air chambers 302, so as to control the parking braking force of the middle and rear axle brake air chambers 302.

[0044] The working principle of the above technical solution is as follows: In normal driving state, the air inlet of the EPB control valve 1002 is connected with the first air outlet and the second air outlet, so the compressed air enters the parking air reservoir 1001 through the pipeline from the third air outlet of the multi-circuit protection valve 2, and then enters the air inlet of the EPB control valve 1002, and then is divided into two paths inside the EPB control valve 1002 and respectively transmitted to the first air outlet and the second air outlet, and then one path is input from the second air outlet of the EPB control valve 1002 through the pipeline into the parking cavity of a pair of front axle brake air chambers 301, and the other path is input from the first air outlet of the EPB control valve 1002 An air outlet is input into the control port of the air-controlled relay valve 1004 through a pipeline, so that the air inlet of the air-controlled relay valve 1004 is connected with multiple air outlets. Therefore, compressed air can be input into the air inlet of the air-controlled relay valve 1004 through the pipeline from the parking air cylinder 1001, and then divided into multiple paths inside the air-controlled relay valve 1004 and respectively transmitted to multiple air outlets, and finally, each air outlet of the air-controlled relay valve 1004 is respectively input into the parking cavity of a pair of center and rear axle brake air chambers 302 through pipelines; at this time, the front axle brake air chamber 301 and the center and rear axle brake air chamber 302 will not generate parking braking force.

[0045] When the driver issues a parking command through the electronic parking brake switch, the ECU will receive this signal and convert it into a corresponding electronic command and send it to the EPB control valve 1002, so that the exhaust port of the EPB control valve 1002 is connected to the first outlet and the second outlet. Therefore, the compressed air in the parking cavity of a pair of front axle brake air chambers 301 will flow back to the second outlet of the EPB control valve 1002 through the pipeline, and then be discharged through the exhaust port of the EPB control valve 1002. At the same time, there will be no compressed air input to the control port of the air-controlled relay valve 1004, so that the exhaust port of the air-controlled relay valve 1004 is connected to multiple air inlets. Therefore, the compressed air in the parking cavity of multiple pairs of middle and rear axle brake air chambers 302 will flow back to the multiple outlets of the air-controlled relay valve 1004 through the pipeline, and then be discharged through the exhaust port of the air-controlled relay valve 1004; at this time, the front axle brake air chamber 301 and the middle and rear axle brake air chamber 302 will generate parking braking force.

[0046] Through the above settings, the pneumatic control of the parking brake can be performed through electronic commands, which improves the response speed and accuracy of the system, reduces the complexity and maintenance cost of the system, and through collaboration with other electronic systems, can provide a more intelligent and safe parking brake experience.

[0047] Based on the above embodiment, the parking brake circuit 10 includes: The air inlet of the electromagnetic switch valve 1003 is connected to the control port of the EPB control valve 1002 and is used to control the release of the parking brake force in an emergency.

[0048] In an emergency, when the control system detects that the EPB control valve 1002 has not received any electronic instructions, it will send an electrical signal to the solenoid switch valve 1003 to switch the working position of the solenoid switch valve 1003, thereby opening the control port of the EPB control valve 1002, and the exhaust port of the EPB control valve 1002 will be connected to the first air outlet and the second air outlet.

[0049] Through the above settings, the automatic parking assist function is achieved, allowing the control system to actively brake, which is especially important in emergency avoidance or sudden failures, and can greatly improve the safety of the vehicle.

[0050] In some embodiments, Figure 1 As shown, it also includes an auxiliary braking circuit 11, which includes: The auxiliary air storage cylinder 1101 is connected to the fourth air outlet of the multi-circuit protection valve 2 and is used to store compressed air; The pressure reducing valve 1102, whose air inlet is connected to the auxiliary air storage cylinder 1101, is used to reduce the pressure of the compressed air to meet the use requirements; The multi-way control valve 1103, whose air inlet is connected to the air outlet of the pressure reducing valve 1102, is used to divide the compressed air into multiple paths so as to independently perform different functions, such as: air horn, air lift and gear shifting; Multiple opening and closing valves 1104, the air inlet is connected to the air outlet of the pressure reducing valve 1102, and are used for various functions, such as: exhaust auxiliary butterfly valve, differential lock and power take-off.

[0051] Through the above arrangement, a highly integrated system is formed, thereby reducing the complexity and maintenance cost of the system, and realizing independent control of different auxiliary braking components, so that the system can adapt to different road conditions.

[0052] In some embodiments, Figure 1 As shown, the air supply unit 1 includes an air compressor 101, a spiral heat dissipation pipe 102, a condenser 103 and a dryer 104 which are connected in sequence.

[0053] Specifically, the air compressor 101 is used to suck in external air and compress it into high-pressure gas, and the spiral heat dissipation pipe 102 is used to cool the high-temperature compressed air output from the spiral heat dissipation pipe 102 .

[0054] Through the above arrangement, an efficient and stable compressed air supply is achieved, and the temperature of the compressed air can be effectively reduced, thereby avoiding deformation of subsequent components due to thermal expansion, and even mechanical failure and leakage, thereby improving operational stability.

[0055] Based on the above embodiments, Figure 1As shown, the air supply unit 1 further includes a condenser 103 and a dryer 104 which are connected in series between the spiral heat dissipation pipe 102 and the multi-circuit protection valve 2 .

[0056] Specifically, the condenser 103 is used to reduce the water vapor content in the compressed air to prevent it from condensing into water in the subsequent pipeline, thereby affecting the dryness and purity of the compressed air. The dryer 104 is used to remove residual water, moisture and dust in the compressed air to ensure that the output compressed air is dry and pure.

[0057] Through the above settings, dry and pure compressed air can be ensured, various components can be protected from corrosion and damage, the service life of the equipment can be extended, and the stability and reliability of the pneumatic system can be guaranteed, so that the system can operate normally for a long time.

[0058] In some embodiments, Figure 1 As shown, the middle and rear axle brake air chambers 302 are arranged in two pairs, which are one pair of middle axle brake air chambers and one pair of rear axle brake air chambers respectively, which can provide stable drive and ensure driving stability; but it is not limited to this, and can be more, which can be arranged accordingly according to the specific vehicle model without specific limitation.

[0059] The embodiment of the present application also discloses a wide-body mining dump truck, comprising the above-mentioned wire control braking system.

[0060] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A brake-by-wire system, characterized in that: include: Air supply unit; A multi-circuit protection valve, the air inlet of which is connected to the air supply unit; Brake actuation unit, including A pair of front axle brake chambers, Multiple pairs of center and rear axle brake chambers; Front axle brake circuit, including The front axle air reservoir is connected to the first air outlet of the multi-circuit protection valve. A single-channel EBS valve, the air inlet of which is connected to the front axle air reservoir, and the two air outlets of which are respectively connected to the driving chamber of one of the front axle brake air chambers; Center and rear axle brake circuit, including The middle and rear axle air reservoir is connected to the second air outlet of the multi-circuit protection valve. A multi-channel EBS valve, the air inlets of which are all connected to the mid-rear axle air reservoir, and the air outlets of which are each connected to a driving cavity of a mid-rear axle brake air chamber; A service brake valve, wherein the first air inlet is connected to the front axle air reservoir, the second air inlet is connected to the middle and rear axle air reservoirs, the first air outlet is connected to the control port of the single-channel EBS valve, and the second air outlet is connected to the control port of the multi-channel EBS valve; The electromagnetic relay valve has an air inlet connected to the mid-rear axle air reservoir, a first air outlet connected to the control port of the single-channel EBS valve, and a second air outlet connected to the control port of the multi-channel EBS valve.

2. The brake-by-wire system according to claim 1, characterized in that: The front axle braking circuit also includes: Two ABS valves are connected in series one by one between the driving cavity of the front axle brake air chamber and the air outlet of the single-channel EBS valve.

3. The brake-by-wire system according to claim 1, characterized in that: Also includes: A first shuttle valve, wherein a first air inlet is connected to a first air outlet of the service brake valve through a pipeline, a second air inlet is connected to a first air outlet of the electromagnetic relay valve through a pipeline, and an air outlet is connected to a control port of the single-channel EBS valve through a pipeline; The second shuttle valve has a first air inlet connected to the second air outlet of the service brake valve through a pipeline, a second air inlet connected to the second air outlet of the electromagnetic relay valve through a pipeline, and an air outlet connected to the control port of the multi-channel EBS valve through a pipeline.

4. The brake-by-wire system according to claim 1, characterized in that: Also includes: Parking brake circuit, including The parking air reservoir is connected to the third air outlet of the multi-circuit protection valve. The EPB control valve has an air inlet connected to the parking air reservoir, and a second air outlet connected to the parking chambers of a pair of front axle brake air chambers. The air-controlled relay valve has an air inlet connected to the parking air reservoir, a control port connected to the first air outlet of the EPB control valve, and each air outlet is connected to the parking cavity of a pair of the middle and rear axle brake air chambers.

5. The brake-by-wire system according to claim 4, characterized in that: The parking brake circuit includes The electromagnetic switch valve has an air inlet connected to the control port of the EPB control valve.

6. The brake-by-wire system according to claim 1, characterized in that: Also includes: Auxiliary brake circuit, including The auxiliary air storage cylinder is connected to the fourth air outlet of the multi-circuit protection valve. The air inlet of the pressure reducing valve is connected to the auxiliary air storage cylinder. The air inlet of the multi-way control valve is connected to the air outlet of the pressure reducing valve. A plurality of opening and closing valves, the air inlet of which is connected to the air outlet of the pressure reducing valve.

7. The brake-by-wire system according to claim 1, characterized in that: The air supply unit comprises an air compressor and a spiral heat dissipation pipe which are connected in sequence.

8. The brake-by-wire system according to claim 7, characterized in that: The air supply unit also includes a condenser and a dryer connected in series between the spiral heat dissipation pipe and the multi-circuit protection valve.

9. The brake-by-wire system according to claim 1, characterized in that: The middle and rear axle brake air chambers are provided with two pairs.

10. A wide-body mining dump truck, characterized in that: A brake-by-wire system comprising the brake-by-wire system according to any one of claims 1 to 9.

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