Hydraulic brake system and vehicle

Abstract

The present disclosure relates to a hydraulic braking system and a vehicle, the hydraulic braking system comprising a braking mechanism, a first hydraulic braking unit and a second hydraulic braking unit independent of the first hydraulic braking unit, a first hydraulic pump in the first hydraulic braking unit being communicated with the braking mechanism through a first hydraulic braking oil path to provide hydraulic pressure to the braking mechanism so that the braking mechanism brakes the vehicle normally. An accumulator in the second hydraulic braking unit being communicated with the braking mechanism through a second hydraulic braking oil path to provide hydraulic pressure to the braking mechanism so that the braking mechanism brakes the vehicle in an emergency. The pressure building oil path for realizing normal braking of the vehicle and the pressure building oil path for realizing emergency braking of the vehicle are independent of each other and do not affect each other, when the pressure building oil path of one of them is out of order, the pressure building oil path of the other can normally build pressure, improving the reliability of the hydraulic braking system of the vehicle.

Description

Technical Field

[0001] This disclosure relates to the technical field of hydraulic braking, and more specifically, to a hydraulic braking system and a vehicle. Background Technology

[0002] Hydraulic braking in rail vehicles involves using a hydraulic source to build pressure on the braking mechanism to brake the wheels. The hydraulic braking system typically performs two functions: conventional hydraulic braking and emergency hydraulic braking. In related technologies, the hydraulic circuit for conventional hydraulic braking and the hydraulic circuit for emergency braking are integrated through valves and other hydraulic components. This overlap between the two circuits causes interference during pressure build-up, resulting in poor reliability of the vehicle's hydraulic braking system. Summary of the Invention

[0003] The purpose of this disclosure is to provide a hydraulic braking system and vehicle in which the pressure build-up during emergency braking does not affect the pressure build-up during conventional braking, thereby improving the reliability of the vehicle's hydraulic braking system.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a hydraulic braking system, comprising: a braking mechanism for braking the vehicle;

[0005] The first hydraulic braking unit includes a first hydraulic pump and a first hydraulic braking circuit. The first hydraulic pump is connected to the braking mechanism through the first hydraulic braking circuit to provide hydraulic pressure to the braking mechanism for the braking mechanism to perform conventional braking on the vehicle.

[0006] The second hydraulic braking unit, independent of the first hydraulic braking unit, includes an accumulator and a second hydraulic braking circuit. The accumulator is connected to the braking mechanism through the second hydraulic braking circuit to provide hydraulic pressure to the braking mechanism for emergency braking of the vehicle.

[0007] Optionally, a first switching valve is provided on the first hydraulic braking oil circuit between the first hydraulic pump and the braking mechanism to control the opening and closing of the oil circuit between the first hydraulic pump and the braking mechanism.

[0008] Optionally, the first hydraulic pump is a bidirectional hydraulic pump.

[0009] Optionally, the first hydraulic braking unit further includes an auxiliary pressure relief circuit, the auxiliary pressure relief circuit being connected to the first hydraulic braking circuit between the braking mechanism and the first switching valve; and / or

[0010] A second switching valve is provided on the auxiliary pressure relief oil circuit to control the on / off state of the auxiliary pressure relief oil circuit; and / or

[0011] The auxiliary pressure relief oil circuit is equipped with a first throttle valve, which is connected to the oil outlet of the second switching valve.

[0012] Optionally, a first pressure sensor and / or pressure switch are provided in the first hydraulic brake circuit; and / or

[0013] A first filter is installed in the oil line between the first hydraulic pump and the first switching valve.

[0014] Optionally, a third switching valve is provided on the second hydraulic brake circuit to control the opening and closing of the second hydraulic brake circuit between the accumulator and the braking mechanism.

[0015] Optionally, the second hydraulic braking unit further includes a pressure reducing valve, which is located in the first hydraulic braking oil circuit between the accumulator and the third switching valve; and / or

[0016] A second throttle valve is provided on the second hydraulic braking oil line between the third switching valve and the braking mechanism to reduce the impact of the oil supplied by the accumulator to the braking mechanism.

[0017] Optionally, the second hydraulic braking unit further includes a second hydraulic pump, which is connected to the accumulator and is used to provide hydraulic pressure to the accumulator. A control valve is provided on the oil line connecting the second hydraulic pump and the accumulator.

[0018] Optionally, the second hydraulic braking unit further includes a pressure relief valve, which is connected in parallel to the second hydraulic braking oil line connecting the control valve and the accumulator.

[0019] Optionally, the third hydraulic braking unit further includes a relief valve, which is connected in parallel to the oil circuit connecting the second hydraulic pump and the control valve.

[0020] Optionally, the second hydraulic braking unit further includes a second pressure sensor and a third pressure sensor. The second pressure sensor is connected to the accumulator and is used to monitor the pressure of the accumulator. The third pressure sensor is connected in parallel to the second hydraulic braking oil line between the third switching valve and the braking mechanism and is used to monitor the oil pressure of the braking mechanism.

[0021] Optionally, a second filter is provided between the second hydraulic pump and the control valve for filtering the oil pumped by the second hydraulic pump to the accumulator.

[0022] Optionally, the hydraulic braking system further includes a controller, wherein the first hydraulic braking unit and the second hydraulic braking unit are respectively signal-connected to the controller, and the controller controls the first hydraulic braking unit and the second hydraulic braking unit to pressurize and / or depressurize the braking mechanism.

[0023] A second aspect of this disclosure provides a vehicle including the aforementioned hydraulic braking system.

[0024] The hydraulic braking system, as described above, includes a braking mechanism, a first hydraulic braking unit, and a second hydraulic braking unit. The first hydraulic pump in the first hydraulic braking unit is connected to the braking mechanism via a first hydraulic braking oil circuit to provide hydraulic pressure, enabling the braking mechanism to perform conventional braking on the vehicle. The accumulator in the second hydraulic braking unit is connected to the braking mechanism via a second hydraulic braking oil circuit to provide hydraulic pressure, enabling the braking mechanism to perform emergency braking on the vehicle. By separating the pressure-building oil circuits for conventional braking and emergency braking, the systems operate independently and do not affect each other. If one pressure-building oil circuit malfunctions, the other can still build pressure normally, thus improving the reliability of the vehicle's hydraulic braking system.

[0025] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the working principle of the first hydraulic braking unit in a hydraulic braking system provided in some exemplary embodiments of this disclosure;

[0028] Figure 2 This is a schematic diagram of the working principle of the second hydraulic braking unit in a hydraulic braking system provided in some exemplary embodiments of this disclosure;

[0029] Figure 3 This is a schematic diagram of the working principle of the first hydraulic braking unit in a hydraulic braking system provided in some other exemplary embodiments of this disclosure;

[0030] Figure 4 This is a schematic diagram of the working principle of the second hydraulic braking unit in a hydraulic braking system provided in some other exemplary embodiments of this disclosure;

[0031] Figure 5 This is a diagram showing the flow path of hydraulic fluid in the first hydraulic unit provided in an exemplary embodiment of this disclosure, through the first hydraulic braking oil circuit to the brake to construct pressure braking, wherein the path indicated by the arrow is the flow path of the hydraulic fluid;

[0032] Figure 6 This is a diagram of the oil flow path of the braking mechanism provided in the exemplary embodiment of this disclosure, which relieves braking by depressurizing through the first hydraulic braking oil circuit, wherein the path indicated by the arrow is the oil flow path;

[0033] Figure 7 This is a schematic diagram of the braking process after the brake mechanism is pressurized and maintained through the first hydraulic brake oil circuit in an exemplary embodiment of this disclosure.

[0034] Figure 8 This is an exemplary embodiment of the present disclosure showing the oil flow path diagram when the braking mechanism is pressure-built and braked through the second hydraulic oil circuit in the second hydraulic braking unit, wherein the arrow path in the figure represents the oil flow path.

[0035] Figure 9 This is a schematic diagram of the braking state maintained after the brake mechanism is pressurized and braked by the second hydraulic oil circuit in the second hydraulic braking unit, provided in an exemplary embodiment of this disclosure.

[0036] Figure 10 This is a schematic diagram of the oil flow path when the second hydraulic pump builds up pressure in the accumulator according to an exemplary embodiment of this disclosure, wherein the path indicated by the arrow in the figure is the oil flow path.

[0037] Explanation of reference numerals in the attached figures

[0038] 1-First hydraulic pump; 2-First motor; 3-First filter; 4-First switching valve; 5-Second switching valve; 6-First throttle valve; 7-First pressure sensor; 8-Pressure switch; 9-Brake mechanism; 10-First hydraulic brake unit; 11-Oil tank; 111-Oil filler port; 12-First hydraulic brake circuit; 13-Auxiliary pressure relief circuit; 14-Second hydraulic pump; 15-Second motor; 16-Second filter; 17-Relief valve; 18-Control valve; 19-Pressure relief valve; 20-Pressure reducing valve; 21-Third switching valve; 22-Second throttle valve; 23-Second pressure sensor; 24-Third pressure sensor; 25-Accumulator; 26-Second hydraulic brake circuit; 27-Second hydraulic brake unit; 28-Breaker valve. Detailed Implementation

[0039] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0040] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer contours of a component or structure itself; unless otherwise specified, terms such as "first" and "second" are used to distinguish one element from another and do not have sequential or importance implications. Furthermore, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0041] The first aspect of this disclosure provides a hydraulic braking system, such as Figures 1 to 2 As shown, the system includes a braking mechanism 9, a first hydraulic braking unit 10, and a second hydraulic braking unit 27 independent of the first hydraulic braking unit 10. The first hydraulic braking unit 10 and the second hydraulic braking unit 27 can respectively build up pressure on the braking mechanism 9 to achieve both conventional and emergency braking of the vehicle. The first hydraulic braking unit 10 includes a first hydraulic pump 1 and a first hydraulic brake circuit 12. The first hydraulic pump 1 is connected to the braking mechanism 9 through the first hydraulic brake circuit 12 to provide hydraulic pressure to the braking mechanism 9 for conventional braking. The second hydraulic brake circuit 26 includes an accumulator 25 and a second hydraulic brake circuit 26. The accumulator 25 is connected to the braking mechanism 9 through the second hydraulic brake circuit 26 and provides hydraulic pressure to the braking mechanism 9 for emergency braking. As mentioned above, the vehicle's conventional braking and emergency braking each use their own independent hydraulic circuits for pressure build-up. The two pressure build-up hydraulic circuits do not affect each other. When one of the braking pressure build-up hydraulic circuits malfunctions, the other braking pressure build-up hydraulic circuit can still build pressure normally, thus improving the reliability of the vehicle's hydraulic braking system.

[0042] It should be noted that the vehicle's normal braking refers to the braking used when the vehicle is braking normally, while the vehicle's emergency braking refers to the braking used when the vehicle needs to brake urgently.

[0043] like Figure 3 as well as Figures 5 to 7 As shown, in some embodiments, to facilitate the switching between the first hydraulic brake circuit 12 and the brake mechanism 9, a first switching valve 4 is provided on the first hydraulic brake circuit 12 between the first hydraulic pump 1 and the brake mechanism 9. The first switching valve 4 can be any suitable valve. For example, the first switching valve 4 can be a two-position, two-way solenoid valve, which has a simple structure and is easy to control.

[0044] In the above embodiments, in order to reduce impurities in the oil supplied by the first hydraulic pump 1 to the braking mechanism 9, a first filter 3 can be installed in the oil line between the first hydraulic pump 1 and the first switching valve 4. The first filter 3 can filter impurities in the oil pumped by the first hydraulic pump 1 to the braking mechanism 9.

[0045] Furthermore, the first hydraulic pump 1 can be configured as a bidirectional hydraulic pump. On the one hand, the bidirectional hydraulic pump can supply pressure to the braking mechanism 9 through the first hydraulic braking oil circuit 12; on the other hand, it can release pressure from the braking mechanism 9. Both pressure building and pressure release of the braking mechanism 9 are achieved through the first hydraulic braking oil circuit 12, which simplifies the oil pipeline setup, resulting in a simple structure and cost savings.

[0046] In some implementations, such as Figure 3 as well as Figures 5 to 7 As shown, the first hydraulic braking unit 10 also includes an auxiliary pressure relief oil circuit 13, which is connected to the first hydraulic braking oil circuit 12 between the braking mechanism 9 and the first switching valve 4. A second switching valve 5 is provided on the first hydraulic braking oil circuit 12 to control the opening and closing of the auxiliary pressure relief oil circuit 13.

[0047] In the above-described embodiments, the auxiliary pressure relief oil circuit 13 can serve as a backup pressure relief oil circuit to drain the oil in the braking mechanism 9 when the first switching valve 4 or the first hydraulic pump 1 in the first hydraulic braking oil circuit 12 fails, so as to relieve the braking of the vehicle by the braking mechanism 9.

[0048] In addition, a first throttle valve 6 can be installed on the auxiliary pressure relief oil circuit 13. The first throttle valve 6 is connected to the oil outlet of the second switch valve 5. When the auxiliary pressure relief oil circuit 13 is used to relieve pressure to the oil tank 11, the second throttle valve 22 can limit the impact rate during pressure relief and play a certain pressure reduction effect.

[0049] In some implementations, such as Figure 3 as well as Figures 5 to 7 As shown, a first pressure sensor 7 and / or a pressure switch 8 are installed on the first hydraulic brake circuit 12. The first pressure sensor 7 monitors the pressure of the braking mechanism 9, and the pressure switch 8 provides an early warning when the first switching valve 4 or the first hydraulic pump 1 in the first hydraulic brake circuit 12 malfunctions and cannot properly release pressure. The first pressure sensor 7 can be configured as an oil pressure sensor. The specific applications of the first pressure sensor 7 and the pressure switch 8 will be elaborated below and will not be repeated here.

[0050] In some embodiments, the hydraulic braking system further includes a controller, which can be a separately configured brake for the hydraulic braking system or a general control unit for the vehicle. A first hydraulic braking unit 10 is signal-connected to the controller, which controls the pressure build-up and / or depressurization of the first hydraulic braking unit 10.

[0051] The following describes the working process of the first hydraulic braking unit 10 performing conventional pressure-building braking, brake holding, and brake release on the braking mechanism 9. The first switching valve 4 and the second switching valve 5 can both be configured as two-position, two-way solenoid valves. The first hydraulic pump 1 is configured as a bidirectional hydraulic pump and is driven by the first motor 2. The first switching valve 4, the second switching valve 5, the first motor 2, the first pressure sensor 7, and the pressure switch 8 are all connected to the controller signal.

[0052] like Figure 5 As shown, when the braking mechanism 9 is pressurized for braking, the second switch valve 5 on the auxiliary pressure relief oil circuit 13 is closed. The first switch valve 4 opens, and the first motor 2 drives the first hydraulic pump 1 to rotate forward, so that the first hydraulic pump 1 supplies hydraulic pressure to the braking mechanism 9 through the first hydraulic braking oil circuit 12. The first pressure sensor 7 monitors the oil pressure of the braking mechanism 9. When the oil pressure in the braking mechanism 9 reaches the preset pressure, the first pressure sensor 7 feeds back the monitored pressure signal to the controller, and the controller controls the first switch valve 4 to close and controls the first hydraulic pump 1 to stop running.

[0053] like Figure 7 As shown, when the braking mechanism 9 is pressurized and braked through the first hydraulic braking oil circuit 12 in the first hydraulic braking unit 10 and then braked, both the first switching valve 4 and the second switching valve 5 are in the closed state.

[0054] like Figure 6 As shown, when the braking mechanism 9 releases its braking force, it is necessary to depressurize the braking mechanism 9 to relieve the braking force of the vehicle. At this time, the first switch valve 4 is opened to control the first hydraulic pump 1 to reverse, so that the oil in the braking mechanism 9 is discharged into the oil tank 11 through the first hydraulic brake oil circuit 12.

[0055] When the first switching valve 4 or the first hydraulic pump 1 in the first hydraulic brake circuit 12 malfunctions and fails to drain the oil from the brake mechanism 9, the pressure switch 8 will issue a warning. In this case, pressure needs to be released through the auxiliary pressure relief circuit 13. Open the second switching valve 5, and the oil in the brake mechanism 9 will drain into the oil tank 11 through the auxiliary pressure relief circuit 13. When the oil pressure in the brake mechanism 9 drops to the preset value, the warning from the pressure switch 8 will be released, and the second switching valve 5 can be closed.

[0056] The second hydraulic braking unit 27 is described below. In some embodiments, a third switching valve 21 is provided on the second hydraulic braking circuit 26 to control the opening and closing of the second hydraulic braking circuit 26 between the accumulator 25 and the braking mechanism 9. When it is necessary to apply pressure to the braking mechanism 9, the third switching valve 21 can be opened; after applying pressure to the braking mechanism 9 is completed, the third switching valve 21 can be closed.

[0057] like Figure 4 as well as Figures 8 to 10 As shown, in some embodiments, the second hydraulic braking unit 27 further includes a pressure reducing valve 20, which is located on the first hydraulic braking oil circuit 12 between the accumulator 25 and the third switching valve 21. The pressure reducing valve 20 is used to reduce and regulate the hydraulic pressure supplied by the accumulator 25 to the braking mechanism 9, so that the hydraulic pressure supplied to the braking mechanism 9 reaches the pressure range that meets the braking requirements of the braking mechanism 9.

[0058] In addition, in some embodiments, a second throttle valve 22 is provided on the second hydraulic brake oil circuit 26 between the third switching valve 21 and the braking mechanism 9 to reduce the impact of the oil supplied by the accumulator 25 to the braking mechanism 9.

[0059] In some embodiments, the second hydraulic braking unit 27 further includes a second hydraulic pump 14, which is connected to the accumulator 25 and is used to provide hydraulic pressure to the accumulator 25. A control valve 18 is provided in the oil line connecting the second hydraulic pump 14 and the accumulator 25. The control valve 18 can be configured as a check valve, which allows the oil pumped by the second hydraulic pump 14 to enter the accumulator 25 through the check valve, and prevents the backflow of oil in the accumulator 25 during emergency braking.

[0060] In other possible implementations, the control valve 18 may also be configured as other types of valves or valve groups. For example, the control valve 18 may be configured as a two-position two-way solenoid valve, which can be opened when pressure needs to be supplied to the accumulator 25, and closed to prevent oil backflow when the pressure supply is completed.

[0061] In some embodiments, a second filter 16 is provided between the second hydraulic pump 14 and the control valve 18 to filter the oil delivered by the second hydraulic pump 14 to the accumulator 25, so as to ensure the cleanliness of the oil delivered by the second hydraulic pump 14 to the accumulator 25.

[0062] like Figure 4 as well as Figures 8 to 10 As shown, in some embodiments, the second hydraulic braking unit 27 further includes a relief valve 17. The relief valve 17 is connected in parallel to the oil circuit connecting the second hydraulic pump 14 and the control valve 18. The relief valve 17 acts as a safety valve to prevent the oil pressure in the second hydraulic braking unit 27 from being too high. That is, when the oil pressure in the oil circuit from the second hydraulic pump 14 to the control valve 18 is high and exceeds the safety value of the relief valve 17, the relief valve 17 will discharge the oil into the oil tank 11 to ensure the safety of the oil circuit.

[0063] In some embodiments, the second hydraulic braking unit 27 further includes a pressure relief valve 19. The pressure relief valve 19 is connected in parallel to the second hydraulic braking circuit 26 between the control valve 18 and the accumulator 25. When maintenance is required on the accumulator 25 or the circuit connecting the control valve 18 and the accumulator 25, the pressure relief valve 19 can be opened to release the pressure in the accumulator 25 and the circuit. The pressure relief valve 19 can be configured as a manual pressure relief valve, allowing for manual pressure release in the absence of power.

[0064] In some embodiments, the second hydraulic braking unit 27 further includes a second pressure sensor 23 and a third pressure sensor 24. The second pressure sensor 23 is connected to the accumulator 25 and is used to detect the pressure of the accumulator 25. The third pressure sensor 24 is connected in parallel to the second hydraulic braking oil circuit 26 between the third switching valve 21 and the braking mechanism 9 and is used to monitor the oil pressure of the braking mechanism 9.

[0065] In the above-described embodiment, specifically, the third pressure sensor 24 is connected in parallel to the second hydraulic brake oil circuit 26 between the second throttle valve 22 and the braking mechanism 9.

[0066] In some embodiments, the second pressure sensor 23 and the third pressure sensor 24 may be configured as oil pressure sensors.

[0067] In some embodiments, the second hydraulic braking unit 27 may also be connected to the controller signal mentioned above. The controller controls the second hydraulic braking unit 27 to build up pressure and / or release pressure on the braking mechanism 9. The specific control process will be described below in the process of the second hydraulic braking unit 27 performing pressure-building braking, holding braking, and pressure-relieving braking on the braking mechanism 9.

[0068] Furthermore, it should be noted that in some embodiments, the braking mechanism 9 connected to the first hydraulic braking unit 10 and the braking mechanism 9 connected to the second hydraulic braking unit 27 are the same braking mechanism 9, which is used to brake the wheels of the vehicle. The first hydraulic braking oil circuit 12 in the first hydraulic braking unit 10 and the second hydraulic braking oil circuit 26 in the second hydraulic braking unit 27 can be connected. For example, a three-way connector can be provided, with the first hydraulic braking oil circuit 12 connected to one port of the three-way connector, the second hydraulic braking oil circuit 26 connected to the other port of the three-way connector, and the remaining port of the three-way connector connected to the braking mechanism 9. When the first braking unit performs pressure building, holding, and pressure relief on the braking mechanism 9, the second hydraulic braking unit 27 is not working, and the third switching valve 21 in the second hydraulic braking unit 27 is in the closed state. When the second hydraulic braking unit 27 performs emergency pressure building and holding braking, the first hydraulic braking unit 10 is not working, and the first switching valve 4 and the second switching valve 5 in the first hydraulic unit are closed. When the second hydraulic braking unit 27 releases pressure to relieve braking, the first switching valve 4 and the second switching valve 5 in the first hydraulic braking unit 10 can be selectively opened to drain the oil in the braking mechanism 9 through the oil passage in the first hydraulic braking unit 10.

[0069] In other possible implementations, a pressure relief circuit can be connected in parallel to the second hydraulic brake circuit 26 between the third switching valve 21 and the brake mechanism 9 for pressure relief of the brake mechanism 9. A switching valve can be installed on this pressure relief circuit. When pressure relief is needed through this circuit, the switching valve can be opened; when pressure relief is not needed, the switching valve can be closed.

[0070] This disclosure exemplarily describes the emergency pressure-building braking and brake-holding process of the second hydraulic braking unit 27 on the braking mechanism 9. The third switching valve 21 may be configured as a two-position two-way solenoid valve, the second hydraulic pump 14 is driven by the second motor 15, and the third switching valve 21, as well as the second pressure sensor 23 and the third pressure sensor 24 configured as oil pressure sensors, are all connected to the aforementioned controller signal.

[0071] like Figure 8 As shown, when emergency braking is required using the second hydraulic braking unit 27, the third switching valve 21 in the second hydraulic braking circuit 26 can be opened. This allows the oil in the accumulator 25 to reach the braking mechanism 9 via the pressure reducing valve 20, the third switching valve 21, and the second throttle valve 22 in the second hydraulic braking circuit 26, pressurizing the braking mechanism 9 and enabling it to brake the vehicle.

[0072] like Figure 9As shown, when the pressure of the braking mechanism 9 reaches the preset value, the third pressure sensor 24 feeds back the pressure signal of the braking mechanism 9 to the controller, and the controller controls the third switching valve 21 to close, so that the braking mechanism 9 maintains braking of the vehicle.

[0073] When the first hydraulic brake circuit 12 is connected to the second hydraulic brake circuit 26, when it is necessary to release pressure on the brake mechanism 9 to alleviate the braking of the vehicle, the third switch valve 21 is in the closed state, the first switch valve 4 in the first hydraulic brake unit 10 is opened, and then the first hydraulic pump 1 pumps the oil in the brake mechanism 9 back to the oil tank 11 through the first hydraulic brake circuit 12.

[0074] In addition, such as Figure 10 As shown, hydraulic pressure can be supplied to the accumulator 25 via the second hydraulic pump 14. The oil pumped by the second hydraulic pump 14 is delivered to the accumulator 25 through the control valve 18, which is configured as a one-way valve, for emergency braking. When the second pressure sensor 23 detects that the oil pressure in the accumulator 25 has reached a preset value, it feeds back the detected pressure signal to the controller, which then controls the second motor 15 to stop operating, thereby stopping the second hydraulic pump 14.

[0075] It should be understood that the fuel tank 11 has a filler port 111 for adding fuel to the fuel tank 11, and the fuel tank 11 is also equipped with a breather valve 28 for balancing the air pressure inside and outside the fuel tank 11.

[0076] The second aspect of this disclosure provides a vehicle including the aforementioned hydraulic braking system, which has all the beneficial effects of the aforementioned hydraulic braking system, which will not be repeated here.

[0077] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0078] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0079] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A hydraulic braking system, characterized in that, include: Braking mechanism, used for braking vehicles; The first hydraulic braking unit includes a first hydraulic pump and a first hydraulic braking circuit. The first hydraulic pump is connected to the braking mechanism through the first hydraulic braking circuit to provide hydraulic pressure to the braking mechanism for the braking mechanism to perform conventional braking on the vehicle. A second hydraulic braking unit, independent of the first hydraulic braking unit, includes an accumulator and a second hydraulic braking circuit. The accumulator is connected to the braking mechanism through the second hydraulic braking circuit to provide hydraulic pressure to the braking mechanism for emergency braking of the vehicle. A first switching valve is provided on the first hydraulic braking oil circuit between the first hydraulic pump and the braking mechanism to control the opening and closing of the oil circuit between the first hydraulic pump and the braking mechanism; The first hydraulic braking unit further includes an auxiliary pressure relief oil circuit, which is connected to the first hydraulic braking oil circuit between the braking mechanism and the first switching valve; and A second switching valve is provided on the auxiliary pressure relief oil circuit to control the opening and closing of the auxiliary pressure relief oil circuit.

2. The hydraulic braking system according to claim 1, characterized in that, The first hydraulic pump is a bidirectional hydraulic pump.

3. The hydraulic braking system according to claim 1, characterized in that, The auxiliary pressure relief oil circuit is equipped with a first throttle valve, which is connected to the oil outlet of the second switching valve.

4. The hydraulic braking system according to claim 1, characterized in that, The first hydraulic brake circuit is equipped with a first pressure sensor and / or a pressure switch; and / or A first filter is installed in the oil line between the first hydraulic pump and the first switching valve.

5. The hydraulic braking system according to any one of claims 1-4, characterized in that, A third switching valve is provided on the second hydraulic braking circuit to control the opening and closing of the second hydraulic braking circuit between the accumulator and the braking mechanism.

6. The hydraulic braking system according to claim 5, characterized in that, The second hydraulic braking unit further includes a pressure reducing valve, which is located in the second hydraulic braking oil circuit between the accumulator and the third switching valve; and / or A second throttle valve is provided on the second hydraulic braking oil line between the third switching valve and the braking mechanism to reduce the impact of the oil supplied by the accumulator to the braking mechanism.

7. The hydraulic braking system according to claim 1, characterized in that, The second hydraulic braking unit further includes a second hydraulic pump, which is connected to the accumulator and is used to provide hydraulic pressure to the accumulator. A control valve is provided on the oil line connecting the second hydraulic pump and the accumulator.

8. The hydraulic braking system according to claim 7, characterized in that, The second hydraulic braking unit further includes a pressure relief valve, which is connected in parallel to the second hydraulic braking oil line connecting the control valve and the accumulator.

9. The hydraulic braking system according to claim 7, characterized in that, The second hydraulic braking unit also includes a relief valve, which is connected in parallel to the oil circuit connecting the second hydraulic pump and the control valve.

10. The hydraulic braking system according to claim 5, characterized in that, The second hydraulic braking unit further includes a second pressure sensor and a third pressure sensor. The second pressure sensor is connected to the accumulator and is used to monitor the pressure of the accumulator. The third pressure sensor is connected in parallel to the second hydraulic braking oil line between the third switching valve and the braking mechanism and is used to monitor the oil pressure of the braking mechanism.

11. The hydraulic braking system according to claim 7, characterized in that, A second filter is provided between the second hydraulic pump and the control valve for filtering the oil pumped by the second hydraulic pump to the accumulator.

12. The hydraulic braking system according to claim 1, characterized in that, The hydraulic braking system further includes a controller, wherein the first hydraulic braking unit and the second hydraulic braking unit are respectively signal-connected to the controller, and the controller controls the first hydraulic braking unit and the second hydraulic braking unit to pressurize and / or depressurize the braking mechanism.

13. A vehicle, characterized in that, Includes the hydraulic braking system as described in any one of claims 1-12.

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