A passive hydraulic brake control device with integrated auxiliary relief function

Abstract

The present invention relates to a passive hydraulic brake control device with an integrated auxiliary relief function, comprising: a fuel tank; an oil supply unit; a normal brake relief unit; and an auxiliary relief unit comprising a first one-way valve, an auxiliary accumulator, and a solenoid valve. The present invention integrates the functions of the auxiliary relief device within the hydraulic brake control device, providing both a normal brake relief unit and an auxiliary relief unit. When normal relief fails to relieve the passive hydraulic clamp, an auxiliary relief function is provided. Energizing the solenoid valve allows hydraulic clamp release. This device features high integration, convenient operation, increased vehicle reliability, reduced hydraulic brake system configuration, and reduced vehicle weight.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking, and in particular to a passive hydraulic brake control device with integrated auxiliary relief function. Background Art

[0002] Hydraulic brake systems are increasingly being used in urban rail braking systems due to their high power-to-weight ratio, space-saving design, light weight, and rapid response. The hydraulic brake control unit (BCU) is a key component in the hydraulic brake system responsible for receiving commands from the electronic brake control unit, establishing and outputting hydraulic pressure, and then transmitting this pressure to the hydraulic caliper to operate the caliper for braking and braking. Hydraulic brake control units are categorized as active and passive. Active BCUs are suitable for trailer active brake calipers, while passive BCUs are suitable for EMU passive brake calipers.

[0003] Under normal circumstances, the hydraulic brake control device only provides one hydraulic pressure output, which is used for the hydraulic caliper braking and relief required under normal circumstances. However, for driving safety, a separate auxiliary relief device will be set up. When the hydraulic brake control device fails and cannot relieve the passive hydraulic caliper, the auxiliary relief device will provide hydraulic pressure to relieve the caliper.

[0004] Normally, the hydraulic brake control device only provides one hydraulic pressure output, which is used for the hydraulic pressure required for hydraulic caliper braking and relief under normal circumstances. However, for driving safety, in addition to controlling the hydraulic unit for pressure relief, the following two auxiliary relief methods are also used: an auxiliary relief device independent of the hydraulic unit is set up to provide hydraulic pressure to relieve the hydraulic brake caliper; or manual relief is performed through a mechanical relief device installed on the hydraulic brake caliper itself. The mechanical relief method requires manual relief operation. In this case, the driver and passengers need to carry a hand pump to the bottom of the vehicle to operate or perform manual mechanical relief operation, which takes a long time. As a result, the rail transit vehicle cannot be quickly evacuated when the hydraulic unit fails. In addition, the separate auxiliary relief device also makes the vehicle configuration redundant, increases the vehicle weight, and increases the cost. Summary of the Invention

[0005] In response to the shortcomings in the relevant technologies, the present invention provides a passive hydraulic brake control device with an integrated auxiliary relief function, which integrates the functions of the auxiliary relief device into the hydraulic brake control device, reduces the configuration of the hydraulic brake system, reduces the weight of the vehicle, eliminates the need for a separate auxiliary relief device, and reduces the cost of the brake system.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A passive hydraulic brake control device with integrated auxiliary relief function, controlled by an electronic brake control unit, is used for braking and releasing a brake cylinder, wherein the brake cylinder is provided with a common external oil port and an auxiliary relief external oil port;

[0008] The passive hydraulic brake control device comprises:

[0009] tank;

[0010] Oil supply unit: comprising an oil inlet branch and an oil outlet branch, wherein the oil inlet branch is connected to the oil tank;

[0011] Common brake relief unit: comprising an oil supply end and an oil outlet end, wherein the oil supply end is connected to the oil outlet branch of the oil supply unit, and the oil outlet end is connected to the common external oil port;

[0012] Auxiliary relief unit: includes a first auxiliary relief branch, a second auxiliary relief branch, a first one-way valve, an auxiliary accumulator, and a solenoid valve; the solenoid valve includes an oil inlet, a first oil outlet, and a second oil outlet;

[0013] The first one-way valve is provided with an inlet and an outlet, the inlet is connected to the oil outlet branch of the oil supply unit; the auxiliary accumulator is connected to the outlet of the first one-way valve through the first auxiliary relief branch; the oil inlet of the solenoid valve is connected to the outlet of the first one-way valve through the second auxiliary relief branch; the first oil outlet is connected to the oil tank; and the second oil outlet is connected to the auxiliary relief external oil port;

[0014] When the solenoid valve loses power, the first oil outlet is connected to the second oil outlet, and the brake cylinder is connected to the oil tank through the solenoid valve; when the solenoid valve is energized, the solenoid valve oil inlet is connected to the second oil outlet, and the brake cylinder is connected to the auxiliary accumulator through the solenoid valve.

[0015] In some embodiments of the present invention, the auxiliary mitigation unit further comprises:

[0016] The third auxiliary relief branch: a first overflow valve is provided on it, one end of the third auxiliary relief branch is connected to the oil tank, and the other end is connected to the outlet of the first one-way valve.

[0017] In some embodiments of the present invention, the auxiliary mitigation unit further comprises:

[0018] The fourth auxiliary relief branch is provided with a pressure relief valve. One end of the fourth auxiliary relief branch is connected to the oil tank, and the other end is connected to the outlet of the first one-way valve.

[0019] In some embodiments of the present invention, the auxiliary relief unit further includes: a pressure switch, wherein the pressure switch is connected to the auxiliary relief external oil port to feed back an auxiliary relief signal.

[0020] In some embodiments of the present invention, a damper is provided between the first oil outlet and the oil tank.

[0021] In some embodiments of the present invention, the service brake relief unit further comprises: a first service branch, a second service branch, a service accumulator, and a third service branch;

[0022] The common accumulator is connected to the oil outlet branch of the oil supply unit through the first common branch; the oil tank is connected to the oil outlet branch of the oil supply unit through the second common branch; two high-speed switching valves are arranged on the second common branch, the high-speed switching valve close to the oil tank is set as a drain valve, and the high-speed switching valve away from the oil tank is set as a filling valve; the filling valve is a normally closed valve, which is opened by power, and the drain valve is a normally open valve, which is closed by power; the common external oil port of the brake cylinder is connected between the filling valve and the drain valve through the third common branch.

[0023] Furthermore, a damper is provided between the drain valve and the oil tank; a first pressure sensor is provided on the first common branch of the common accumulator to detect the common accumulator pressure; a second pressure sensor is provided on the third common branch to detect the brake cylinder pressure.

[0024] In some embodiments of the present invention, the oil supply unit further comprises:

[0025] Gear pump: connected to the oil tank and provided with an oil outlet;

[0026] Motor: connected to the gear pump through an elastic coupling;

[0027] Filter: connected to the oil outlet of the gear pump;

[0028] A second one-way valve: an inlet of the second one-way valve is connected to the filter, and an outlet of the second one-way valve is connected to the service brake relief unit and the auxiliary relief unit;

[0029] The second relief valve is connected in parallel to the oil outlet of the gear pump to limit the oil outlet pressure of the gear pump, thereby forming a pressure limiting circuit.

[0030] In some embodiments of the present invention, an integrated valve block is installed on the upper portion of the oil tank, and the components of the oil supply unit, the service brake relief unit, and the auxiliary relief unit are all installed on the same integrated valve block;

[0031] The oil circuits for connecting the oil supply unit, the normal brake relief unit and the auxiliary relief unit components are all arranged inside the integrated valve block.

[0032] Furthermore, an electrical protection cover is provided on the upper portion of the integrated valve block, and an electrical connector is provided on the electrical protection cover. The electrical connector is connected to the electronic brake control unit and is controlled by the electronic brake control unit.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The function of the auxiliary relief device is integrated into the hydraulic brake control device, which reduces the configuration of the hydraulic brake system. When the common relief cannot relieve the passive hydraulic clamp, the auxiliary relief function is provided. The hydraulic clamp can be relieved when the solenoid valve is energized. It has high integration and convenient operation, which increases the reliability of vehicle driving and reduces vehicle weight. A separate auxiliary relief device is no longer needed, reducing the cost of the brake system.

[0035] 2. The auxiliary relief unit is equipped with a pressure switch, which can feed back the auxiliary relief external oil port pressure signal to the vehicle to assist the driver in determining whether the vehicle should be assisted.

[0036] 3. A common brake relief unit is also provided, which, in addition to the auxiliary relief function, can also realize the vehicle's common relief, common braking, parking brake, holding brake and other functions.

[0037] 4. The oil supply unit ensures that the oil pressure in the accumulator is within a certain working pressure range. When oil is needed for braking or brake relief, the accumulator is quickly replenished with oil, which can ensure that the hydraulic brake system quickly builds up braking pressure and avoid frequent starting and stopping of the motor. In addition, when the motor fails, the oil stored in the accumulator ensures that the brake can be applied, thereby improving safety.

[0038] 5. A damper is set on the branch line returning to the fuel tank to adjust the discharge rate, reduce vehicle impulse and improve vehicle safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 This is a schematic diagram of the hydraulic brake control device of the present invention.

[0041] In the above figure: 1. Fuel tank; 2. Brake cylinder; 201. Common external oil port; 202. Auxiliary relief external oil port; 301. Gear pump; 302. Motor; 303. Filter; 304. Second one-way valve; 305. Second overflow valve; 401. Common accumulator; 402. Filling valve; 403. Drain valve; 404. Second common branch damping; 405. First pressure sensor; 406. Second pressure sensor; 501. First one-way valve; 502. Auxiliary accumulator; 503. Solenoid valve; 5031. Solenoid valve oil inlet; 5032. Solenoid valve first oil outlet; 5033. Solenoid valve second oil outlet; 504. First overflow valve; 505. Pressure relief valve; 506. Pressure switch; 507. First oil outlet damping. DETAILED DESCRIPTION

[0042] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0044] The terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] The present invention provides a passive hydraulic brake control device with integrated auxiliary relief function, which is controlled by an electronic brake control unit and is used for braking and relief of the brake cylinder. Figure 1 As shown, the brake cylinder 2 is provided with a normal external oil port 201 and an auxiliary relief external oil port 202. The normal external oil port 201 is used to input oil into the brake cylinder 2 in the normal braking / relieving state, and the auxiliary relief external oil port 202 is used to input oil into the brake cylinder 2 in the auxiliary relief state. The structure of the brake cylinder 2 belongs to the prior art and will not be described in detail here.

[0047] As attached Figure 1 As shown, in an exemplary embodiment of a passive hydraulic brake control device with integrated auxiliary relief function of the present invention, the device includes:

[0048] Oil tank 1, used to store the oil for brake relief of the train brake system;

[0049] Oil supply unit: includes an oil inlet branch and an oil outlet branch, the oil inlet branch is connected to the oil tank 1;

[0050] Common brake relief unit: including an oil supply end and an oil outlet end, the oil supply end is connected to the oil outlet branch of the oil supply unit, and the oil outlet end is connected to the common external oil port 201;

[0051] Auxiliary relief unit: It is connected in parallel with the common brake relief unit in the oil outlet branch of the oil supply unit through the first one-way valve 501, and obtains the oil provided by the oil supply unit respectively; the first one-way valve 501 has an inlet and an outlet, and is connected from the inlet to the outlet. Its inlet end is connected to the oil outlet branch of the oil supply unit, and the outlet end of the first one-way valve 501 is divided into two parallel branches: the first auxiliary relief branch is connected to the auxiliary accumulator 502 to charge the auxiliary accumulator 502; the second auxiliary relief branch is connected to the solenoid valve 503 The oil inlet 5031 is then connected to the oil tank 1 through the first oil outlet 5032 and to the auxiliary relief external oil port 202 through the second oil outlet 5033. The solenoid valve 503 is configured as a two-position three-way solenoid valve. When it loses power, the first oil outlet 5032 and the second oil outlet 5033 are connected, and the brake cylinder 2 is connected to the oil tank 1 through the solenoid valve 503. When it is energized, the solenoid valve oil inlet 5031 and the second oil outlet 5033 are connected, and the brake cylinder 2 is connected to the auxiliary accumulator 502 through the solenoid valve 503.

[0052] The solenoid valve 503 is controlled by an electrical signal to start and stop the auxiliary relief function; in some embodiments of the present invention with a higher degree of integration, the solenoid valve 503 can be automatically controlled; only the control method of the solenoid valve 503 is described here, which cannot be understood as a limitation of the present invention.

[0053] In some embodiments, the auxiliary relief unit further includes a third auxiliary relief branch connected in parallel to the outlet of the first one-way valve 501, on which a first relief valve 504 is provided, which is connected to the oil tank 1 to limit the pressure of the auxiliary relief accumulator, thereby ensuring the auxiliary relief function and improving safety.

[0054] In some embodiments, the auxiliary mitigation unit further includes a fourth auxiliary mitigation branch connected in parallel to the outlet of the first one-way valve 501 : a pressure relief valve 505 is provided on the fourth auxiliary mitigation branch and connected to the fuel tank 1 . The pressure relief valve 505 is configured as a manual unloading valve. When manually opened, the oil in the auxiliary accumulator 502 flows directly back into the fuel tank 1 .

[0055] In some embodiments, the auxiliary relief unit also includes a pressure switch 506, which is connected to the output circuit of the auxiliary relief external oil port 202. The pressure switch 506 can detect the pressure at the auxiliary relief external oil port 202 and feedback the auxiliary relief signal based on the pressure detected at the auxiliary relief external oil port 202.

[0056] In some embodiments, a damper 507 is provided between the first oil outlet 5032 of the solenoid valve 503 and the oil tank 1 to adjust the auxiliary pressure relief rate, reduce vehicle impulse, and improve safety.

[0057] In some embodiments, the common brake relief unit is further configured as two pressure branches connected in parallel after the oil outlet branch of the oil supply unit, wherein the first common branch is connected to the common accumulator 401 to supply oil to the common accumulator 401; the second common branch is connected to the oil tank 1 through two high-speed switching valves, and the high-speed switching valve away from the oil tank 1 is configured as a normally closed filling valve 402, and the high-speed switching valve close to the oil tank 1 is configured as a normally open drain valve 403; in this embodiment, the filling valve 402 is a normally closed valve, which is opened by power, and the drain valve 403 is a normally open valve, which is closed by power, and a third common branch is provided between the two high-speed switching valves to connect to the common external oil port 201 of the brake cylinder 2.

[0058] When the parking brake is applied, the entire vehicle and the entire device lose power, and the normally open drain valve 403 can ensure that the brake pressure of the common external oil port 201 returns to the oil tank 1 through the drain valve 403, ensuring that the passive clamp applies maximum braking force.

[0059] When oil is needed for applying the brakes or relieving the brakes, the common accumulator 401 is used to quickly replenish oil, which can ensure that the hydraulic brake system quickly builds up braking pressure and avoid frequent starting and stopping of the motor 302. In addition, when the motor 302 fails, the oil stored in the common accumulator 401 ensures that the brakes can be applied, thereby improving safety.

[0060] In some embodiments, a damper 404 is provided between the drain valve 403 and the fuel tank 1 to adjust the drain rate, reduce vehicle impulse, and improve safety.

[0061] In some embodiments, a first pressure sensor 405 is connected in parallel to the pressure circuit of the common accumulator 401 to detect the pressure within the common accumulator 405. A second pressure sensor 406 is connected in parallel to the circuit of the common external oil port 201 to detect the pressure within the brake cylinder 2. When the first pressure sensor 405 detects that the oil pressure within the common accumulator 401 is below a set lower pressure limit, the oil supply unit fills the common accumulator 401. When the oil pressure within the common accumulator 401 reaches the set upper pressure limit, the oil supply function is shut off, and filling stops. This process maintains the oil pressure within the common accumulator 401 within a certain operating pressure range.

[0062] In some embodiments, the oil supply unit further comprises:

[0063] Gear pump 301: connected to oil tank 1, which is provided with an oil outlet;

[0064] Motor 302: connected to gear pump 301 via an elastic coupling; motor 302 and gear pump 301 cooperate to provide oil delivery power;

[0065] Filter 303: connected to the oil outlet of the gear pump 301, used to filter oil impurities;

[0066] The second one-way valve 304 has an inlet connected to the filter 303 and an outlet connected to the service brake release unit and the auxiliary brake release unit. In this embodiment, the outlet of the second one-way valve 304 is connected to the service accumulator 401 and is connected to the auxiliary accumulator 502 via the first one-way valve 501.

[0067] The second relief valve 305 is connected in parallel to the oil outlet of the gear pump 301 to limit the oil outlet pressure of the gear pump 301, forming a pressure limiting circuit to ensure that the system does not exceed the limit pressure;

[0068] When the motor 302 is started, the gear pump 301 is driven through the elastic coupling to supply oil to the common brake relief unit and the auxiliary relief unit; when the motor is turned off, the filling is stopped.

[0069] In some embodiments, an integrated valve block is installed on the upper part of the oil tank 1, and the components of the oil supply unit, the normal brake relief unit and the auxiliary relief unit are all installed on the same integrated valve block;

[0070] The oil circuits for connecting the oil supply unit, the common brake relief unit and the auxiliary relief unit components are all arranged inside the integrated valve block to facilitate integrated control.

[0071] Furthermore, an electrical protection cover is provided on top of the integrated valve block. The cover is equipped with an electrical connector that is connected to and controlled by the electronic brake control unit. The electrical protection cover is used to protect components such as hydraulic valves, sensors, and motors.

[0072] In some embodiments, two oil marks are provided on the oil tank 1, corresponding to a high oil mark and a low oil mark, and the oil level can be observed through the oil marks; a quick oil filling plug is provided on the oil tank 1, and the oil tank 1 can be quickly filled with oil and drained through the quick oil filling plug.

[0073] The working principle of the passive hydraulic brake control device with integrated auxiliary relief function of the present invention is described in detail below.

[0074] The present invention accepts the instruction of the electronic brake control unit and can realize five braking modes of the vehicle, namely: normal braking, parking braking, holding braking, normal relief and auxiliary relief.

[0075] First pressure sensor 405 monitors the oil pressure within common accumulator 401 in real time. When the oil pressure falls below the set lower pressure limit, motor 302 starts, driving gear pump 301 via an elastic coupling to charge the accumulator. When the oil pressure reaches the set upper pressure limit, motor 302 shuts off, stopping charging. This process ensures that the oil pressure within the accumulator is sufficient to quickly build brake pressure in the hydraulic brake system and prevents frequent starting and stopping of motor 302.

[0076] Normal braking: When the vehicle applies normal braking, the solenoid valve 503 loses power, the auxiliary relief external oil port 202 is connected to the oil tank 1 through the solenoid valve 503, and the pressure of the auxiliary relief external oil port 202 is 0; the electronic brake control unit controls the filling valve 402 and the drain valve 403 to adjust the oil flow input to the brake cylinder 2 to achieve braking force control. The normal braking force can be adjusted steplessly.

[0077] Parking brake: When the vehicle loses power, the entire device loses power. The oil from the external oil port 201 commonly used by the hydraulic clamp returns to the oil tank 1 through the drain valve 403. The pressure of the external oil port 201 commonly used by the hydraulic clamp is 0. The hydraulic clamp assists in relieving the oil from the external oil port 202 and returns to the oil tank 1 through the solenoid valve 503. The hydraulic clamp assists in relieving the pressure of the external oil port 202 to 0, ensuring that the passive hydraulic clamp exerts the maximum spring braking force.

[0078] Holding brake: When the vehicle needs to apply holding brake, the solenoid valve 503 loses power, the auxiliary relief external oil port 202 is connected to the oil tank 1 through the solenoid valve 503, and the pressure of the auxiliary relief external oil port 202 is 0; the electronic brake control unit controls the filling valve 402 and the drain valve 403, adjusts the oil flow input to the brake cylinder 2, controls the pressure of the brake cylinder 2 to maintain at the braking pressure value, and the vehicle applies holding brake.

[0079] Common relief: When the vehicle needs relief, the solenoid valve 503 loses power, the auxiliary relief external oil port 202 is connected to the oil tank 1 through the solenoid valve 503, and the pressure of the auxiliary relief external oil port 202 is 0; the electronic brake control unit controls the filling valve 402 to be energized and opened, and the drain valve 403 to be energized and closed. At this time, the pressure of the common external oil port 201 of the hydraulic clamp is equal to the pressure of the common accumulator 401, and the passive hydraulic clamp is relieved.

[0080] Auxiliary relief: When the normal relief circuit fails and the hydraulic clamp brake pressure cannot be relieved, the control solenoid valve 503 is energized, and the auxiliary accumulator 502 is connected to the hydraulic clamp auxiliary relief external oil port 202. At this time, the pressure of the hydraulic clamp auxiliary relief external oil port 202 is equal to the pressure of the auxiliary accumulator 502, and the vehicle is assisted in relief.

[0081] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A passive hydraulic brake control device with integrated auxiliary relief function, characterized in that: Controlled by the electronic brake control unit, it is used for braking and releasing the brake cylinder, and the brake cylinder is provided with a common external oil port and an auxiliary relief external oil port; The passive hydraulic brake control device comprises: tank; Oil supply unit: comprising an oil inlet branch and an oil outlet branch, wherein the oil inlet branch is connected to the oil tank; Common brake relief unit: comprising an oil supply end and an oil outlet end, wherein the oil supply end is connected to the oil outlet branch of the oil supply unit, and the oil outlet end is connected to the common external oil port; Auxiliary relief unit: includes a first auxiliary relief branch, a second auxiliary relief branch, a first one-way valve, an auxiliary accumulator, and a solenoid valve; the solenoid valve includes an oil inlet, a first oil outlet, and a second oil outlet; The first one-way valve is provided with an inlet and an outlet, the inlet is connected to the oil outlet branch of the oil supply unit; the auxiliary accumulator is connected to the outlet of the first one-way valve through the first auxiliary relief branch; the oil inlet of the solenoid valve is connected to the outlet of the first one-way valve through the second auxiliary relief branch; the first oil outlet is connected to the oil tank; and the second oil outlet is connected to the auxiliary relief external oil port; When the solenoid valve loses power, the first oil outlet is connected to the second oil outlet, and the brake cylinder is connected to the oil tank through the solenoid valve; when the solenoid valve is energized, the solenoid valve oil inlet is connected to the second oil outlet, and the brake cylinder is connected to the auxiliary accumulator through the solenoid valve.

2. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 1, characterized in that: The auxiliary mitigation unit further includes: The third auxiliary relief branch: a first overflow valve is provided on it, one end of the third auxiliary relief branch is connected to the oil tank, and the other end is connected to the outlet of the first one-way valve.

3. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 1, characterized in that: The auxiliary mitigation unit further includes: The fourth auxiliary relief branch is provided with a pressure relief valve. One end of the fourth auxiliary relief branch is connected to the oil tank, and the other end is connected to the outlet of the first one-way valve.

4. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 1, characterized in that: The auxiliary relief unit further includes a pressure switch connected to the auxiliary relief external oil port to feed back an auxiliary relief signal.

5. The passive hydraulic brake control device with integrated auxiliary relief function according to any one of claims 1, 2, 3 or 4, characterized in that: A damper is provided between the first oil outlet and the oil tank.

6. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 1, characterized in that: The common brake relief unit further comprises: a first common branch, a second common branch, a common accumulator, and a third common branch; The common accumulator is connected to the oil outlet branch of the oil supply unit through the first common branch; the oil tank is connected to the oil outlet branch of the oil supply unit through the second common branch; two high-speed switching valves are arranged on the second common branch, the high-speed switching valve close to the oil tank is set as a drain valve, and the high-speed switching valve away from the oil tank is set as a filling valve; the filling valve is a normally closed valve, which is opened by power, and the drain valve is a normally open valve, which is closed by power; the common external oil port of the brake cylinder is connected between the filling valve and the drain valve through the third common branch.

7. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 6, characterized in that: A damper is provided between the drain valve and the oil tank; a first pressure sensor is provided on the first common branch of the common accumulator to detect the common accumulator pressure; a second pressure sensor is provided on the third common branch to detect the brake cylinder pressure.

8. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 1, characterized in that: The oil supply unit further comprises: Gear pump: connected to the oil tank and provided with an oil outlet; Motor: connected to the gear pump through an elastic coupling; Filter: connected to the oil outlet of the gear pump; A second one-way valve: an inlet of the second one-way valve is connected to the filter, and an outlet of the second one-way valve is connected to the service brake relief unit and the auxiliary relief unit; The second relief valve is connected in parallel to the oil outlet of the gear pump to limit the oil outlet pressure of the gear pump, thereby forming a pressure limiting circuit.

9. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 1, characterized in that: An integrated valve block is installed on the upper part of the oil tank, and the components of the oil supply unit, the normal brake relief unit and the auxiliary relief unit are all installed on the same integrated valve block; The oil circuits for connecting the oil supply unit, the normal brake relief unit and the auxiliary relief unit components are all arranged inside the integrated valve block.

10. The passive hydraulic brake control device with integrated auxiliary relief function according to claim 9, characterized in that: An electrical protection upper cover is provided on the upper portion of the integrated valve block. An electrical connector is provided on the electrical protection upper cover. The electrical connector is connected to the electronic brake control unit and is controlled by the electronic brake control unit.

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