An electro-hydraulic brake system for controlling braking of a wheelset of a vehicle

Abstract

The application discloses an electro-hydraulic brake system for controlling vehicle wheel group braking, comprising a parking brake system and a service brake system, and specifically comprising an oil tank, a motor pump group, a two-position two-way electromagnetic reversing valve, a pump outlet pressure gauge, an accumulator liquid charging valve, a two-position three-way electromagnetic reversing valve, a parking brake accumulator, a parking brake pressure gauge, a pressure reducing valve, a service brake accumulator, a pressure sensor, a service brake proportional valve, a motor parking brake, a speed reducer service brake, a vehicle wheel group, a wheel group driving motor, a hydraulic pipeline and an electrical control module. The parking brake system and the service brake system of the electro-hydraulic brake can independently or cooperatively operate, can control the brakes of four wheel groups of the vehicle in real time, can ensure the absolute stop of each wheel group of the vehicle, can maintain the parking of the vehicle under any working conditions such as slopes, can avoid the vehicle from tilting, vibrating and slipping when running due to road conditions, can meet the demand of efficient braking of heavy vehicles, and can improve the safety of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake, in particular to an electro-hydraulic brake system for controlling vehicle wheel group braking. BACKGROUND

[0002] The braking device of the automobile must ensure the stability and maneuverability of the driving, and obtain the shortest braking distance. The heavy vehicle has a larger volume and weight than the ordinary vehicle, and the volume and weight of the loaded cargo transfer equipment are large, so the inertia of the vehicle is large. In the driving process, safety accidents are prone to occur. Therefore, the safety and efficiency of the brake of the heavy vehicle are higher than those of the ordinary vehicle. At present, the heavy equipment transfer site in the site has different road surfaces, and the braking and parking locking of the vehicle are required to be high. When the vehicle encounters complex road surfaces such as slopes, tilting and vibration may occur, which may cause the vehicle to slip and run. The vehicle may also be parked in any working condition, and the performance of the brake is crucial.

[0003] In the current automobile braking system, the oil brake is a common braking device. The oil brake has the advantages of simple structure and small space required for installation. Only the brake master pump, driven cylinder, oil cup and connecting pipeline are required, and no other auxiliary equipment is required. During the braking process, no noise is generated. However, the oil brake has the disadvantage of low strength, and the braking is not efficient enough. Therefore, the oil brake is mainly used for small and medium-sized vehicles with small volume, simple structure and light weight. If it is used for heavy transport vehicles with large inertia, it is difficult to meet the braking requirements of heavy vehicles, and the safety is not high enough.

[0004] The existing technical problem is that the oil brake is not efficient enough for heavy vehicle braking, and the safety is not high enough during vehicle operation. SUMMARY

[0005] In order to solve the technical problems that the heavy vehicle wheel group braking system is not efficient enough, and the safety is not high enough during vehicle operation, the present application provides a more efficient, simple and safe electro-hydraulic brake system to make up for the shortcomings of the current domestic large vehicle braking.

[0006] The present application provides an electro-hydraulic brake system for controlling vehicle wheel group braking, which comprises a parking brake system and a running brake system, and specifically comprises an oil tank, a motor pump group, a two-position two-way electromagnetic reversing valve, a pump outlet pressure gauge, an accumulator charging valve, a two-position three-way electromagnetic reversing valve, a parking accumulator, a parking pressure gauge, a pressure reducing valve, a running accumulator, a pressure sensor, a running proportional valve, a motor parking brake, a speed reducer running brake, a hydraulic pipeline and an electrical control module.

[0007] The motor pump group is connected with the oil tank and the accumulator charging valve, and is used as a pressure building drive of the electro-hydraulic system.

[0008] The electrical control module is used for real-time monitoring and collecting system data for processing and sending electrical signals.

[0009] The pressure sensor is used for real-time monitoring of the pressure of the row brake accumulator and sending the pressure value to the electrical control module for processing.

[0010] The two-position two-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve control the pressure building and pressure relief of the system through power-on and power-off.

[0011] The pump outlet pressure gauge is used for real-time display of the pressure value in the hydraulic pipe at the outlet of the motor pump group.

[0012] Further, an overflow valve is also included, and the motor pump group sucks oil from the oil tank through the pump suction port, and the hydraulic oil flows back to the oil tank through the overflow valve and the two-position two-way electromagnetic reversing valve to form a cycle.

[0013] Further, the electro-hydraulic oil discharged from the motor pump group outlet passes through the accumulator charging valve and enters the row brake accumulator or the parking brake accumulator for energy storage.

[0014] Further, the electrical control module compares the pressure value collected by the pressure sensor with the reference pressure value set in the electrical control module to determine the control of pressure building and pressure relief.

[0015] When the pressure value in the hydraulic pipe is lower than the reference pressure value, the electrical control module sends an instruction to the two-position two-way electromagnetic reversing valve, and the two-position two-way electromagnetic reversing valve loses power, and the main system builds pressure.

[0016] When the pressure value in the hydraulic pipe is higher than the reference pressure value, the electrical control sends an instruction to the two-position two-way electromagnetic reversing valve, and the two-position two-way electromagnetic reversing valve gets power, and the main system releases pressure.

[0017] Further, the reference pressure value can be adjusted within a certain range according to actual conditions to adapt to different driving environments.

[0018] Further, the process of the vehicle wheel set row brake of the electro-hydraulic brake system is:

[0019] The motor pump group builds pressure, the electro-hydraulic oil reaches the row brake accumulator through the accumulator charging valve for energy storage, and through the feedback of external electrical signals (such as electrical signal output pedals), the electrical control module processes and transmits to the row brake proportional valve to act, and outputs electro-hydraulic oil to the vehicle wheel set speed reducer row brake mechanism to control the wheel set drive motor to slow down and realize stepless brake.

[0020] Further, the process of the vehicle wheel set parking brake of the electro-hydraulic brake system is:

[0021] The motor pump group builds pressure, and the electro-hydraulic oil reaches the parking accumulator through the accumulator charging valve to store energy. When parking, the signal is sent through the electrical button switch, the two-position three-way electromagnetic reversing valve loses power, the electro-hydraulic oil reaches the motor parking brake through the one-way valve, and the motor parking brake realizes the brake of the wheel set driving motor. When the vehicle starts in the parking state, the signal is sent through the electrical button switch, the two-position three-way electromagnetic reversing valve gets power, the electro-hydraulic oil is depressurized through the motor parking brake to the pressure reducing valve, the motor brake is released, and the vehicle starts.

[0022] Further, the motor parking brake adopts a hydraulic brake mode in the parking process, builds pressure for the wheel set driving motor, and ensures that the vehicle wheel set is absolutely stopped.

[0023] Further, the electro-hydraulic brake system can simultaneously control the service braking and parking braking of four vehicle wheel sets.

[0024] The advantages of the present application are that the parking braking subsystem and the service braking subsystem of the electro-hydraulic brake can independently or cooperatively operate, real-time control the brakes of four wheel sets of the vehicle, ensure the absolute stop of each wheel set of the vehicle, maintain the parking of the vehicle on a slope or any working condition, avoid the vehicle from tilting, vibrating and slipping when running due to road conditions, meet the demand of high-efficiency braking of heavy vehicles, and improve the safety of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The principle diagram of the electro-hydraulic brake system for vehicle wheel set braking of the present application;

[0026] The label explanation in the figure is as follows: 1-oil tank, 2-air filter, 3-motor pump group, 4-overflow valve, 5-two-position two-way electromagnetic reversing valve, 6-pump outlet pressure gauge, 7-accumulator charging valve, 8-parking accumulator one-way valve, 9-two-position three-way electromagnetic reversing valve, 10-parking accumulator, 11-parking pressure gauge, 12-pressure switch, 13-pressure reducing one-way valve, 14-pressure reducing valve, 15-service accumulator, 16-pressure sensor, 17-service proportional valve, 18-pressure measuring connector, 19-motor parking brake, 20-reducer service brake, 21-vehicle wheel set, and 22-wheel set driving motor. DETAILED DESCRIPTION

[0027] The above description is only a summary of the technical scheme of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, the embodiment of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation manner of the present application is described below.

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. Unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0029] like Figure 1 The electro-hydraulic braking system of the present invention includes two main subsystems: a wheel parking brake and a service brake.

[0030] The motor-pump unit 3 draws oil from the oil tank 1 through the pump suction port, pressurizing the electro-hydraulic oil into the hydraulic pipeline. During pressure build-up, the electro-hydraulic oil flows into the accumulator through the accumulator charging valve 7, storing energy for the parking brake accumulator 10 or the traverse brake accumulator 15. During pressure release, the electro-hydraulic oil flows back to the oil tank 1 through the two-position two-way solenoid directional valve 5. A pump outlet pressure gauge 6 is installed at the outlet end of the motor-pump unit 3 to display the pressure value inside the hydraulic pipeline in real time. A pressure sensor 16 and a traverse brake proportional valve 17 are also installed at the inlet end of the traverse brake accumulator 15. The pressure sensor 16 monitors the pressure of the traverse brake accumulator 15 in real time, collects the pressure value and sends it to the electrical control module for processing. The traverse brake proportional valve 17 receives the continuously variable braking electrical signal transmitted by the electrical control module and continuously controls the flow rate of the electro-hydraulic oil proportionally. The continuously variable braking electrical signal is generated after being processed by the electrical control module through external signal feedback. One end of the travel brake proportional valve 17 is connected to the pressure test connector 18. The pressure test connector 18 can be used to connect an external pressure gauge to observe the hydraulic line pressure at the end of the travel brake proportional valve 17. In this embodiment, it is used as a backup.

[0031] The inlet of the parking brake accumulator 10 is connected to a parking brake accumulator check valve 8, a two-position three-way solenoid directional valve 9, and a pressure reducing valve 14. The parking brake accumulator check valve 8 is used to prevent backflow of electro-hydraulic oil, and the two-position three-way solenoid directional valve 9 is used to control the pressure build-up and pressure release of the parking brake accumulator 10. The pressure reducing valve 14 is connected to a pressure reducing check valve 13, a pressure switch 12, and a parking brake pressure gauge 11. The pressure reducing check valve 13 is used to prevent backflow of electro-hydraulic oil, and the parking brake pressure gauge 11 is used to display the pressure value during the parking brake process.

[0032] The motor parking brake 19 acts on the wheel set driving motor 22 to achieve parking when the vehicle is stationary, and the reduction machine running brake 20 acts on the wheel set driving motor 22 to achieve deceleration and running brake during vehicle running.

[0033] The electro-hydraulic brake system also has an air filter 2 for filtering dust and other particles in the air to prolong the service life of the brake system.

[0034] The working process of the electro-hydraulic brake system is as follows.

[0035] (1) System pressure building and pressure relief: the electrical control module compares the pressure value collected by the pressure sensor 16 with the reference pressure value set in the electrical control module to determine the control of pressure building and pressure relief;

[0036] When the pressure value in the hydraulic circuit is lower than the reference pressure value, the electrical control module sends a command to the two-position two-way electromagnetic reversing valve 5, the two-position two-way electromagnetic reversing valve 5 loses power, and the main system builds pressure;

[0037] When the pressure value in the hydraulic circuit is higher than the reference pressure value, the electrical control sends a command to the two-position two-way electromagnetic reversing valve 5, the two-position two-way electromagnetic reversing valve 5 gets power, and the main system is pressure relief.

[0038] (2) Running brake: during vehicle running, the motor pump group 3 builds pressure, the electro-hydraulic oil reaches the running brake accumulator 15 for energy storage through the accumulator charging valve 7, through the feedback of external electrical signals (such as electrical signal output pedal), processed by the electrical control module, transmitted to the running brake proportional valve 17 to act, and output electro-hydraulic oil to the vehicle wheel set reduction machine running brake 20 mechanism, the reduction machine running brake 20 controls the wheel set driving motor 22 to decelerate to achieve stepless brake.

[0039] (3) Parking brake: when the vehicle is stationary, the motor pump group 3 builds pressure, the electro-hydraulic oil reaches the parking brake accumulator 10 for energy storage through the accumulator charging valve 7, when parking, the electrical button switch sends a signal, the two-position three-way electromagnetic reversing valve 9 loses power, the electro-hydraulic oil reaches the motor parking brake 19 through the one-way valve 13, and the motor parking brake 19 realizes the brake of the wheel set driving motor 22. When the vehicle starts in the parking state, the electrical button switch sends a signal, the two-position three-way electromagnetic reversing valve 9 gets power, the electro-hydraulic oil is pressure reduced through the motor parking brake 19 to the pressure reducing valve 14, the motor brake is released, and the vehicle starts.

[0040] The electro-hydraulic brake system in the example can simultaneously perform running brake and parking brake on four wheel sets, realize brake on the whole vehicle, and ensure the safety of the vehicle brake.

[0041] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electro-hydraulic brake system for controlling braking of a wheel set of a vehicle, comprising a service brake system and a parking brake system, characterized in that, The hydraulic system comprises an oil tank (1), a motor pump group (3), a two-position two-way electromagnetic reversing valve (5), a pump outlet pressure gauge (6), an accumulator charging valve (7), a two-position three-way electromagnetic reversing valve (9), a parking accumulator (10), a parking pressure gauge (11), a pressure reducing valve (14), a running accumulator (15), a pressure sensor (16), a running proportional valve (17), a motor parking device (19), a speed reducer running brake (20), hydraulic pipelines and an electrical control module. The motor pump group (3) is connected with the oil tank (1) and the accumulator charging valve (7) and is used as a pressure building driving device of the electro-hydraulic system. The electrical control module is used for real-time monitoring and collecting system data for processing and sending electrical signals. The pressure sensor (16) is used for real-time monitoring of the pressure of the running accumulator (15) and collecting pressure values and sending the pressure values to the electrical control module. The two-position two-way electromagnetic reversing valve (5) and the two-position three-way electromagnetic reversing valve (9) are controlled by power-on and power-off to build pressure and release pressure. The pump outlet pressure gauge (6) is used for real-time display of the pressure value in the hydraulic pipeline at the outlet of the motor pump group (3). The system further comprises an overflow valve (4), the motor pump group (3) sucks oil from the oil tank (1) through a pump oil suction port, and hydraulic oil is released back to the oil tank through the overflow valve (4) and the two-position two-way electromagnetic reversing valve (5) to form a cycle. The electro-hydraulic oil discharged from the outlet of the motor pump group (3) passes through the accumulator charging valve (7) and enters the running accumulator (15) or the parking accumulator (10) to store energy. The electrical control module compares the pressure value collected by the pressure sensor (16) with a reference pressure value set in the electrical control module to determine the control of pressure building and pressure release. When the pressure value in the hydraulic pipeline is lower than the reference pressure value, the electrical control module sends an instruction to the two-position two-way electromagnetic reversing valve (5), the two-position two-way electromagnetic reversing valve (5) is powered off, and the main system builds pressure. When the pressure value in the hydraulic pipeline is higher than the reference pressure value, the electrical control module sends an instruction to the two-position two-way electromagnetic reversing valve (5), the two-position two-way electromagnetic reversing valve (5) is powered on, and the main system releases pressure. The steps of the vehicle wheel group running brake of the electro-hydraulic brake system are as follows: The motor pump group (3) builds pressure, the electro-hydraulic oil reaches the running accumulator (15) through the accumulator charging valve (7) to store energy, the feedback of external electrical signals is processed by the electrical control module, transmitted to the running proportional valve (17), and the electro-hydraulic oil is output to the speed reducer running brake (20) mechanism of the vehicle wheel group, and the speed reducer running brake (20) controls the wheel group driving motor (22) to slow down to realize stepless braking. The process of the vehicle wheel group parking brake of the electro-hydraulic brake system is as follows: The motor pump group (3) builds pressure, and the electro-hydraulic oil reaches the parking accumulator (10) for energy storage through the accumulator charging valve (7). When parking, the two-position three-way electromagnetic reversing valve (9) loses power through the electrical button switch to send a signal, and the electro-hydraulic oil reaches the motor parking brake (19) through the one-way valve (13), so that the motor parking brake (19) realizes the braking of the wheel group driving motor (22). When the vehicle starts in the parking state, the two-position three-way electromagnetic reversing valve (9) is powered through the electrical button switch to send a signal, and the electro-hydraulic oil is depressurized through the motor parking brake (19) to the pressure reducing valve (14), so that the motor brake is released, and the vehicle starts.

2. An electro-hydraulic brake system for controlling braking of a wheel set of a vehicle according to claim 1, characterized in that, The reference pressure value can be adjusted within a certain range according to actual conditions to adapt to different driving environments.

3. An electro-hydraulic brake system for controlling braking of a wheel set of a vehicle according to claim 1, characterized in that, During the parking process, the motor parking brake (19) adopts a hydraulic brake holding mode to build pressure and hold the wheel group driving motor (22), thereby ensuring that the vehicle wheel group is absolutely stopped.

4. An electro-hydraulic brake system for controlling braking of a wheel set of a vehicle according to claim 1, characterized in that, The electro-hydraulic brake system can simultaneously control the service braking and parking braking of the four vehicle wheel groups (21).

5. An electro-hydraulic brake system for controlling braking of a wheel set of a vehicle according to claim 1, characterized in that, It also includes an air filter (2) for filtering dust particles in the air to prolong the service life of the brake system.

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