Hydraulic brake system, control method, and vehicle

Abstract

The present disclosure relates to a hydraulic braking system, a control method and a vehicle, the hydraulic braking system comprising a brake, a first braking unit and a second braking unit. The brake is configured to brake a wheel. The first braking unit comprises a first power generation assembly configured to be in communication with a brake pedal. The second braking unit is in communication with the first braking unit and the brake respectively. The second braking unit further comprises a second power generation assembly configured to be in communication with the brake pedal. The first power generation assembly is configured to deliver hydraulic medium of the first braking unit to the brake through the second braking unit or to withdraw the hydraulic medium from the brake according to a brake signal of the brake pedal. The second power generation assembly is configured to deliver hydraulic medium of the first braking unit to the brake through the second braking unit or to withdraw the hydraulic medium from the brake according to the brake signal of the brake pedal. In this way, the influence of the reaction force in the hydraulic braking system on the foot feeling of a user using the brake pedal can be avoided.

Description

Technical Field

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

[0002] In related technologies, in the hydraulic braking system of a vehicle, there is a mechanical connection between the brake pedal and the master cylinder. The master cylinder is driven by the brake pedal to pressurize or depressurize the brake, thereby braking or releasing the vehicle. The hydraulic reaction force of the master cylinder can be transmitted to the brake pedal, affecting the user's braking feel. Summary of the Invention

[0003] The purpose of this disclosure is to provide a hydraulic braking system, control method, and vehicle that can prevent the reaction force in the hydraulic braking system from affecting the user's foot feel when using the brake pedal.

[0004] To achieve the above objectives, this disclosure provides a hydraulic braking system, including: a brake for braking wheels; A first braking unit includes a first power generation component for communicative connection with a brake pedal; and The second braking unit is connected to the first braking unit and the brake respectively. The second braking unit also includes a second power generation component that is communicatively connected to the brake pedal. The first power generation component is configured to: deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal, or retract the hydraulic medium in the brake; The second power generation component is configured to: deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal, or retract the hydraulic medium in the brake.

[0005] Optionally, the first braking unit further includes an oil tank, and the first power generation component includes a master cylinder and a first drive mechanism. The master cylinder is connected to the oil tank and the second braking unit respectively through a hydraulic flow path. The first drive mechanism is communicatively connected to the brake pedal and is used to drive the master cylinder according to the brake signal from the brake pedal.

[0006] Optionally, the first drive mechanism includes a servo hydraulic cylinder and a first drive motor connected to the servo hydraulic cylinder, the first drive motor being communicatively connected to the brake pedal.

[0007] Optionally, the second power generation component includes a hydraulic pump and a second drive motor. The hydraulic pump is connected to the first braking unit and the brake respectively through a hydraulic flow path. The second drive motor is signal-connected to the brake pedal and is used to drive the hydraulic pump according to the braking signal from the brake pedal.

[0008] Optionally, the first braking unit includes a first controller, which is communicatively connected to the brake pedal via a first wiring harness; and / or The second braking unit includes a second controller, which is communicatively connected to the brake pedal via a second wiring harness.

[0009] Optionally, the second braking unit includes at least two braking subunits, each subunit including two hydraulic branch paths respectively connected to one of the brakes, and the two hydraulic branch paths are also respectively connected to the master cylinder of the brake via a main hydraulic path. The main hydraulic flow path is equipped with a first isolation valve for controlling the on / off state of the main hydraulic flow path, and each hydraulic branch flow path is equipped with an inlet valve for controlling the on / off state of the hydraulic branch flow path.

[0010] Optionally, the braking subunit further includes a first sub-hydraulic flow path and two return flow paths. The first sub-hydraulic flow path is connected in parallel to the first isolation valve. A hydraulic pump and a second isolation valve capable of controlling the on / off state of the first sub-hydraulic flow path are provided on the first sub-hydraulic flow path. Each of the two return flow paths is respectively connected to one of the hydraulic branch paths, and the connection point is located between the inlet valve and the brake. Each return flow path is also connected between the second isolation valve and the hydraulic pump. Each return flow path is provided with a drain valve for controlling the opening and closing of the return flow path.

[0011] A second aspect of this disclosure provides a control method for a hydraulic braking system, used in the hydraulic braking system provided in the first aspect of this disclosure, the method comprising: Braking, wherein the first power generation component and / or the second power generation component are respectively used to deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal; Release, wherein the first power generation component or the second power generation component is respectively used to retract the hydraulic medium in the brake according to the braking signal of the brake pedal.

[0012] Optionally, the method by which the first power generation component and / or the second power generation component respectively deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal includes: The first braking unit applies the brake, and the first driving mechanism drives the master cylinder according to the braking signal from the brake pedal, so that the hydraulic medium in the oil tank is filled into the brake through the master cylinder, the first isolation valve and the inlet valve. The second braking unit brakes, and the second drive motor drives the hydraulic pump according to the braking signal of the brake pedal, so that the hydraulic medium in the oil tank is filled into the brake through the brake master cylinder, the second isolation valve and the inlet valve; The first braking unit and the second braking unit engage braking in combination. The first drive mechanism drives the master cylinder according to the braking signal from the brake pedal, so that the hydraulic medium in the oil tank is filled into the brake through the master cylinder, the first isolation valve, and the inlet valve. The first isolation valve is closed, and the second drive motor drives the hydraulic pump, so that the hydraulic medium in the oil tank is filled into the brake through the master cylinder, the second isolation valve, and the inlet valve.

[0013] A third aspect of this disclosure provides a vehicle including a hydraulic braking system as provided in the first aspect of this disclosure.

[0014] The hydraulic braking system described above includes a brake, a first braking unit, and a second braking unit. The brake is used for wheel braking. The first braking unit includes a first power generation component for communication with the brake pedal. The second braking unit is connected to both the first braking unit and the brake, and also includes a second power generation component for communication with the brake pedal. The first power generation component is configured to: deliver hydraulic medium from the first braking unit to the brake via the second braking unit, or retract hydraulic medium from the brake, based on a brake pedal signal. The second power generation component is configured to: deliver hydraulic medium from the first braking unit to the brake via the second braking unit, or retract hydraulic medium from the brake, based on a brake pedal signal. Thus, both the first and second power generation components are communicatively connected to the brake pedal. Both components, based on the brake pedal signal, either input hydraulic medium from the first braking unit into the brake to build pressure, or retract hydraulic medium from the brake to release pressure, thereby achieving braking or release of the wheels via the brake. In this way, neither the first power generation component nor the second power generation component in the hydraulic braking system are mechanically connected to the brake pedal, so as to avoid the reaction force in the hydraulic braking system affecting the user's foot feel when using the brake pedal.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] 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: Figure 1 This is a schematic diagram of a hydraulic braking system provided in some exemplary embodiments of this disclosure; Figure 2 This is a schematic diagram of a hydraulic braking system provided in some exemplary embodiments of this disclosure when braking by a first braking unit; wherein, the arrows in the diagram indicate the flow direction of the hydraulic medium; Figure 3 This is a schematic diagram of a hydraulic braking system provided in some exemplary embodiments of this disclosure when braking by a second braking unit; wherein the arrows indicate the flow direction of the hydraulic medium; Figure 4 This is a schematic diagram of the hydraulic braking system provided in some exemplary embodiments of this disclosure, in which the second braking unit supplements the pressure build-up during the joint pressure build-up process of the first and second braking units; wherein, the arrows in the figure indicate the flow direction of the hydraulic medium; Figure 5 This is a schematic diagram of the hydraulic braking system provided in some exemplary embodiments of this disclosure, where pressure is reduced by the first braking unit ABS; wherein, the arrows in the diagram indicate the flow direction of the hydraulic medium; Figure 6 This is a schematic diagram of the second braking unit ABS decompression provided in some exemplary embodiments of this disclosure; wherein, the arrows in the figure indicate the flow direction of the hydraulic medium; Figure 7 This is a flowchart of a control method for a hydraulic braking system provided in some exemplary embodiments of this disclosure.

[0017] Explanation of reference numerals in the attached figures 1-First braking unit; 11-Oil tank; 12-First controller; 13-First power generation component; 131-Master brake cylinder; 132-First drive mechanism; 1321-Servo hydraulic cylinder; 1322-First drive motor; 14-First pressure sensor; 2-Second braking unit; 20-Brake subunit; 21-First isolation valve; 22-Inlet valve; 23-Drain valve; 24-Accumulator; 25-First check valve; 26-Second isolation valve; 27-Second power generation component; 271-Hydraulic pump; 272-Second drive motor; 28-Second pressure sensor; 29-Filter; 210-Second controller; 3-Brake pedal; 4-First wiring harness; 5-Second wiring harness; 6-Main hydraulic flow path; 7-Brake; 2a - Hydraulic branch path; 21a - First hydraulic branch path; 22a - Second hydraulic branch path; 2b - First sub-hydraulic flow path; 2c - Return flow path; 21c - First return flow path; 22c - Second return flow path; 2d - Second sub-hydraulic flow path. Detailed Implementation

[0018] 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.

[0019] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer contours of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0020] The first aspect of this disclosure provides a hydraulic braking system, such as Figures 1 to 6 As shown, the hydraulic braking system includes a brake 7, a first braking unit 1, and a second braking unit 2. The brake 7 is used for braking the wheels. The first braking unit 1 includes a first power generation component 13 for communicative connection with the brake pedal. The second braking unit 2 is connected to both the first braking unit 1 and the brake 7. The second braking unit 2 also includes a second power generation component 27 communicatively connected to the brake pedal 3. The first power generation component 13 is configured to: deliver hydraulic medium from the first braking unit 1 to the brake 7 via the second braking unit 2, or retract hydraulic medium from the brake 7, based on a braking signal from the brake pedal 3. The second power generation component 27 is configured to: deliver hydraulic medium from the first braking unit 1 to the brake 7 via the second braking unit 2, or retract hydraulic medium from the brake 7, based on a braking signal from the brake pedal 3.

[0021] In the above embodiment, the first power generation component 13 is communicatively connected to the brake pedal 3, and the second power generation component 27 is also communicatively connected to the brake pedal 3. Both the first power generation component 13 and the second power generation component 27 input the hydraulic medium in the first braking unit 1 into the brake 7 to build pressure, or retract the hydraulic medium in the brake 7 to release pressure, thereby achieving braking or releasing of the wheels through the brake 7. In this way, neither the first power generation component 13 nor the second power generation component 27 in the hydraulic braking system are mechanically connected to the brake pedal, so as to avoid the reaction force in the hydraulic braking system affecting the user's foot feel when using the brake pedal 3.

[0022] It should be understood that the brake pedal 3 mentioned above can be an electronic brake pedal. The electronic brake pedal can automatically calculate the brake pedal travel based on the user's pedal depth, and simultaneously transmit a braking signal to the first power generation component 13 and / or the second power generation component 27, so that the first power generation component 13 and / or the second power generation component 27 operate according to the brake pedal's braking signal.

[0023] Furthermore, the hydraulic medium mentioned above can be made of a suitable substance depending on the actual needs. For example, hydraulic oil can be used as the hydraulic medium.

[0024] In some embodiments, the first braking unit 1 further includes an oil tank 11, and the first power generation component 13 includes a master brake cylinder 131 and a first drive mechanism 132. The master brake cylinder 131 is connected to the oil tank 11 and the second braking unit 2 through a hydraulic flow path. The first drive mechanism 132 is communicatively connected to the brake pedal 3 and is used to drive the master brake cylinder 131 according to the braking signal from the brake pedal 3.

[0025] In the above embodiment, the first drive mechanism 132 is used to drive the master cylinder 131 according to the brake signal of the brake pedal 3, and to deliver the hydraulic medium in the oil tank 11 to the brake 7 through the master cylinder 131 and the second brake unit 2, so that the brake 7 can build up pressure.

[0026] In some embodiments, the first drive mechanism 132 may include a servo hydraulic cylinder 1321 and a first drive motor 1322 connected to the servo hydraulic cylinder 1321. The first drive motor 1322 is communicatively connected to the brake pedal 3. The first drive motor 1322 can drive the servo hydraulic cylinder 1321 according to the brake signal of the brake pedal 3. The servo hydraulic cylinder 1321 can be used to drive the brake master cylinder 131 to operate for pressure build-up or pressure release of the brake 7.

[0027] In the above embodiments, the first braking unit 1 may further include the first controller 12 mentioned below. The first drive motor 1322 is communicatively connected to the first controller 12, and the first controller 12 is communicatively connected to the brake pedal 3. The first controller 12 can drive the first drive motor 1322 to operate according to the braking signal from the brake pedal 3. The servo hydraulic cylinder 1321 can be connected to the oil tank 11 and the master brake cylinder 131 respectively. The servo hydraulic cylinder 1321 drives the master brake cylinder 131 to operate through the hydraulic medium in the oil tank 11.

[0028] In other possible implementations, the first drive mechanism 132 may be configured in other suitable forms. For example, the first drive mechanism 132 may include a first drive motor 1322, a ball screw, and a gearbox, wherein the input end of the gearbox is connected to the first motor, the output end of the gearbox is connected to the ball screw, the first drive motor 1322 drives the ball screw to rotate through the gearbox, the nut of the ball screw moves along the axial direction of the ball screw, and the nut can be connected to the piston rod of the brake master cylinder 131 through a connecting rod to drive the piston rod to move relative to the cylinder body of the brake master cylinder 131.

[0029] In other possible implementations, the first drive mechanism 132 may also be configured as, for example, an electric push rod, one end of which is connected to the piston rod to drive the piston rod to move relative to the cylinder body of the master cylinder, which is not limited here.

[0030] In some embodiments, the second power generation component 27 includes a hydraulic pump 271 and a second drive motor 272. The hydraulic pump 271 is connected to the first braking unit 1 and the brake 7 via hydraulic flow paths. The second drive motor 272 is signal-connected to the brake pedal 3 and is used to drive the hydraulic pump 271 according to the braking signal from the brake pedal 3. In this way, the hydraulic pump 271 can be operated to pressurize or depressurize the brake 7.

[0031] When the first power generation component 13 in the first braking unit 1 fails, the second power generation component 27 in the second braking unit 2 can serve as a redundant power generation component to ensure that the brake 7 can normally build up and release pressure, thereby enabling normal braking or release of the wheels. For example, when the first power generation component 13 includes a master cylinder 131 and a first drive mechanism 132, if the master cylinder 131 cannot build up pressure normally due to piston seal failure, the second power generation component 27 can be used to build up or release pressure on the brake 7 to achieve braking or release of the wheels.

[0032] In some embodiments, the second braking unit 2 further includes a second controller 210, which is communicatively connected to the brake pedal 3 via a second wiring harness 5. The second drive motor 272 is also communicatively connected to the second controller 210. The second controller 210 can also be connected to the vehicle controller's local area network bus, enabling the first controller 12 to communicate with the vehicle controller. The second braking unit 2 also includes the first isolation valve 21, the second isolation valve 26, the inlet valve 22, and the outlet valve 23 mentioned below. These valves are also communicatively connected to the second controller 210. The second controller 210 controls the second drive motor 272, the first isolation valve 21, the second isolation valve 26, the inlet valve 22, and the outlet valve 23 in the second braking unit 2 based on the braking signal from the brake pedal 3. Thus, the brake pedal 3 is braked via the wire-controlled second braking unit 2, rather than through a rigid mechanical connection, greatly simplifying the overall vehicle layout.

[0033] In some embodiments, the second braking unit 2 includes at least two braking subunits 20, each including two hydraulic branch paths 2a connected to a brake 7. The two hydraulic branch paths 2a are also connected to the master cylinder 131 via a main hydraulic path 6. Thus, the hydraulic medium in the tank 11 can flow through the master cylinder 131, the main hydraulic path 6, and the hydraulic branch paths 2a to the brake 7 connected to each hydraulic branch path 2a.

[0034] The main hydraulic flow path 6 is equipped with a first isolation valve 21 for controlling the on / off state of the hydraulic flow path. By controlling the energization and de-energization of the first isolation valve 21, the working position of the first isolation valve 21 can be switched, thereby controlling the on / off state of the main hydraulic flow path 6. Each hydraulic branch path 2a is equipped with an inlet valve 22 for controlling the on / off state of the hydraulic branch path 2a. By controlling the energization and de-energization of the inlet valve 22, the working position of the inlet valve 22 can be switched, thereby controlling the on / off state of the hydraulic branch path 2a.

[0035] In the above embodiment, the brake subunit 20 in the second brake unit 2 is directly connected to the brake master cylinder 131 through the main hydraulic flow path 6, and no other valves are provided on the main hydraulic flow path 6 except for the first isolation valve 21, so as to reduce the influence of the flow throttling effect and improve the rapid pressure build-up capability of the second brake unit 2.

[0036] In some embodiments, the braking subunit 20 further includes a first sub-hydraulic flow path 2b and two return flow paths 2c. The first sub-hydraulic flow path 2b is connected in parallel to the first isolation valve 21. A hydraulic pump 271 and a second isolation valve 26 for controlling the on / off state of the first sub-hydraulic flow path 2b are provided on the first sub-hydraulic flow path 2b. Each of the two return flow paths 2c is respectively connected to a hydraulic branch flow path 2a, and the connection point is located between the inlet valve 22 and the brake 7. Each return flow path 2c is also connected between the second isolation valve 26 and the hydraulic pump 271. A drain valve 23 for controlling the on / off state of the return flow is provided on each return flow path 2c.

[0037] In the above embodiment, the first end of the first sub-hydraulic flow path 2b is connected to the main hydraulic flow path 6 and is located between the first isolation valve 21 and the brake master cylinder 131. The second end of the first sub-hydraulic flow path 2b is connected between the first isolation valve 21 and the inlet valve 22 of the hydraulic branch flow path 2a. The second isolation valve 26, located in the first sub-hydraulic flow path 2b, is positioned near the first end of the first sub-hydraulic flow path 2b. The hydraulic pump 271 is positioned between the second isolation valve 26 and the second end of the first sub-hydraulic flow path 2b. The second isolation valve 26 may be a high-pressure isolation valve.

[0038] In some examples, such as Figure 1 As shown, the braking subunit 20 includes a second sub-hydraulic flow path 2d, and two return flow paths 2c are respectively connected to the first sub-hydraulic flow path 2b through the second sub-hydraulic flow path 2d. An accumulator 24 is provided on the second sub-hydraulic flow path 2d. The accumulator 24 can suppress the dynamic fluctuations of the hydraulic medium and play a buffering role; on the other hand, the accumulator 24 can also serve as an oil source.

[0039] In addition, such as Figure 1 As shown, a first check valve 25 is also provided on the second sub-hydraulic flow path 2d, which is located between the accumulator 24 and the first sub-hydraulic flow path 2b. The first check valve 25 is configured to allow hydraulic medium from the end of the second sub-hydraulic flow path 2d near the return flow path 2c to flow to the end of the second sub-hydraulic flow path 2d near the first sub-hydraulic flow path 2b, and to prevent hydraulic medium from the end of the second sub-hydraulic flow path 2d near the first sub-hydraulic flow path 2b from flowing to the end of the second sub-hydraulic flow path 2d near the return flow path 2c.

[0040] In some implementations, such as Figure 1As shown, the hydraulic braking system includes a first braking unit 1 and a second braking unit 2. The first braking unit 1 includes an oil tank 11, a master brake cylinder 131, a servo hydraulic cylinder 1321, and a first drive motor 1322. The master brake cylinder 131 may include two hydraulic chambers, which can be a first hydraulic chamber and a second hydraulic chamber, respectively. The master brake cylinder 131 is connected to the oil tank 11. The servo hydraulic cylinder 1321 is connected to both the oil tank 11 and the master brake cylinder 131. The first drive motor 1322 drives the servo hydraulic cylinder 1321 to actuate, and the servo hydraulic cylinder 1321, in turn, drives the master brake cylinder 131 to actuate. The hydraulic braking system may also include a first pressure sensor 14, which can be installed in the servo hydraulic cylinder 1321 to detect the pressure value within the servo hydraulic cylinder 1321 and to determine whether the servo hydraulic cylinder 1321 is operating normally.

[0041] In some embodiments, the first braking unit 1 further includes a first controller 12. The first controller 12 can be communicatively connected to the brake pedal 3 via the first wiring harness 4, and can also be communicatively connected to the first drive motor 1322 and the first brake 7. The first pressure sensor 14 can also be communicatively connected to the first controller 12. The first controller 12 can also be connected to the vehicle controller's local area network bus, enabling it to communicate with the vehicle controller. The first controller 12 can control the first drive motor 1322 based on the braking signal from the brake pedal 3. The brake pedal 3 is braked via the drive-by-wire first braking unit 1. The connection between the brake pedal 3 and the first braking unit 1 is not a rigid mechanical connection, greatly simplifying the vehicle layout.

[0042] In some embodiments, as described above, the first controller 12 in the first braking unit 1 is communicatively connected to the brake pedal 3 via the first wiring harness 4; the second controller 210 in the second braking unit 2 is communicatively connected to the brake pedal 3 via the second wiring harness 5, so that the brake pedal 3 can be braked by the first braking unit 1 and the second braking unit 2 via the wire control, which is beneficial to the development of wire control technology of intelligent chassis. Furthermore, when the first braking unit 1 builds pressure, the second braking unit 2 builds pressure, and the first braking unit 1 and the second braking unit 2 build pressure together as mentioned below, since the brake pedal 3 is not mechanically rigidly connected to the first braking unit 1 and the second braking unit 2, it will not be affected by the reaction force in the hydraulic braking system, and the brake pedal 3 can maintain a better target pedal feel simulation, so as to make the driver's foot feel better.

[0043] In addition, as mentioned above, the first controller 12 of the first braking unit 1 and the second controller 210 of the second braking unit 2 can both be connected to the vehicle controller. In this way, redundant electronic braking without driver intervention can be realized, meeting the needs of advanced driver assistance systems.

[0044] Furthermore, the second braking unit 2 includes two braking subunits 20. One of the two braking subunits 20 is connected to the first hydraulic chamber via a main hydraulic flow path 6, and the other of the two braking subunits 20 is connected to the second hydraulic chamber via a main hydraulic flow path 6. When the servo hydraulic cylinder 1321 drives the master brake cylinder 131 to operate, the hydraulic medium in the first hydraulic chamber of the master brake cylinder 131 can be supplied to the brake 7 through the corresponding braking subunit 20 for braking, and the hydraulic medium in the second hydraulic chamber of the master brake cylinder 131 can be supplied to the brake 7 through the corresponding braking subunit 20 for braking. The two braking subunits 20 are identical. Taking one of the braking subunits 20 as an example, the hydraulic circuit of the braking subunit 20 will be described.

[0045] In some embodiments, the braking subunit 20 includes two hydraulic branch paths 2a, which can be a first hydraulic branch path 21a and a second hydraulic branch path 22a, respectively. One end of each of the first and second hydraulic branch paths 21a is connected to a brake 7. The ends of both the first and second hydraulic branch paths 21a away from the brake 7 are connected to a main hydraulic flow path 6. The other end of the main hydraulic flow path 6 is connected to one of the two hydraulic chambers of the master cylinder 131. A first isolation valve 21 is provided on the main hydraulic flow path 6, which controls the opening and closing of the main hydraulic flow path 6. An inlet valve 22 is provided on the first hydraulic branch path 21a, which controls the opening and closing of the first hydraulic branch path 21a. An inlet valve 22 is also provided on the second hydraulic branch path 22a, which controls the opening and closing of the second hydraulic branch path 22a.

[0046] In addition, the braking subunit 20 also includes a first sub-hydraulic flow path 2b, which is connected in parallel to the first isolation valve 21. A second isolation valve 26 and a hydraulic pump 271 are provided on the first sub-hydraulic flow path 2b. The second isolation valve 26 can be used to control the opening and closing of the first sub-hydraulic flow path 2b.

[0047] In addition, the braking subunit 20 also includes two return flow paths 2c. The two return flow paths 2c include a first return flow path 21c and a second return flow path 22c. One end of the first return flow path 21c is connected to the first hydraulic branch path 21a, and the connection between the first return flow path 21c and the first hydraulic branch path 21a is located between the inlet valve 22 and the brake 7. A drain valve 23 is provided on the first return flow path 21c to control the opening and closing of the first return flow path 2c. The other end of the first return flow path 21c is connected to the first sub-hydraulic flow path 2b through the second sub-hydraulic flow path 2d. One end of the second return flow path 22c is connected to the second hydraulic branch path 22a, and the connection between the second return flow path 22c and the second hydraulic branch path 22a is located between the inlet valve 22 and the brake 7. The second return flow path 22c is provided with a drain valve 23 for controlling the opening and closing of the second return flow path 22c. The other end of the second return flow path 22c is connected to the first sub-hydraulic flow path 2b through a second sub-hydraulic flow path 2d. The second sub-hydraulic flow path 2d, which connects the first return flow path 21c and the second return flow path 22c, can be the same path. The connection point of the second sub-hydraulic flow path 2d can be located between the second isolation valve 26 and the hydraulic pump 271. An accumulator 24 can be installed on the second sub-hydraulic flow path 2d. On the one hand, it can suppress the dynamic fluctuations of the hydraulic medium and play a buffering role. On the other hand, it can also serve as an oil source. A first check valve 25 is installed on the second sub-hydraulic flow path 2d. The first check valve 25 is located between the accumulator 24 and the first sub-hydraulic flow path 2b. The first check valve 25 is configured to allow the hydraulic medium at the end of the second sub-hydraulic flow path 2d near the return flow path 2c to flow from the end of the second sub-hydraulic flow path 2d near the first sub-hydraulic flow path 2b.

[0048] In addition, such as Figure 1 As shown, the second braking unit 2 also includes multiple filters 29 disposed in the hydraulic flow path, which can be used to filter impurities in the hydraulic medium.

[0049] The second braking unit 2 also includes a second drive motor 272, which can be driven and connected to the hydraulic pumps 271 in the two braking subunits 20 respectively. The second drive motor 272 can be used to drive the hydraulic pumps 271 in the two braking subunits 20 respectively.

[0050] The first isolation valve 21, the second isolation valve 26, the inlet valve 22, and the outlet valve 23 can all be solenoid valves, and the first isolation valve 21, the second isolation valve 26, the inlet valve 22, and the outlet valve 23 are all communicatively connected to the second controller 210. The second drive motor 272 is also communicatively connected to the second controller 210.

[0051] In addition, the hydraulic braking system also includes a second pressure sensor 28, which can be connected to the main hydraulic flow path 6 and can be used to detect the pressure in the hydraulic chamber of the master cylinder 131, thereby determining whether the master cylinder 131 is in normal operating condition. The second pressure sensor 28 can also be communicatively connected to the second controller 210.

[0052] The following is a brief description of the hydraulic braking system's first braking unit 1 pressure-building braking, second braking unit 2 pressure-building braking, first braking unit 1 and second braking unit 2 combined pressure-building braking, first braking unit 1 ABS anti-lock braking, second braking unit 2 ABS anti-lock braking, and brake 7 decompression process.

[0053] It should be noted that when the hydraulic braking system is in normal (not powered) state, the first isolation valve 21 and the inlet valve 22 are both in the open state, while the second isolation valve 26 and the drain valve 23 are in the closed state.

[0054] The first braking unit 1 builds up pressure for braking, and the hydraulic braking system is normal (both the first braking unit 1 and the second braking unit 2 are available). When braking is required, the user presses the brake pedal 3. Based on the user's pressing depth, the internal controller of the brake pedal 3 automatically calculates the travel of the brake pedal 3 and transmits it to the first controller 12, the second controller 210, and the vehicle controller. The first controller 12 determines the pressure increase ratio based on the travel of the brake pedal 3 and drives the first drive motor 1322. The first drive motor 1322 can drive the servo hydraulic cylinder 1321 to operate. The servo hydraulic cylinder 1321 drives the brake master cylinder 131 to operate, so as to pass the hydraulic medium through the two braking sub-units 20 into the four brakes 7 respectively, for the purpose of building up pressure in the brakes 7, thereby realizing the braking of the vehicle.

[0055] In the above implementation methods, such as Figure 2 As shown, the servo hydraulic cylinder 1321 drives the brake master cylinder 131 to operate. The hydraulic medium enters the brake 7 from the oil tank 11 through the brake master cylinder 131, the first isolation valve 21, and the second isolation valve 26, so as to build up pressure on the brake 7.

[0056] The first controller 12 is connected to the brake pedal 3 via the first wiring harness 4, which allows the first braking unit 1 and the brake pedal 3 to be decoupled. In other words, the ratio between the travel of the brake pedal 3 and the braking force of the first braking unit 1 is adjustable and not a fixed ratio.

[0057] The second braking unit 2 builds up pressure for braking. When the first braking unit 1 fails (e.g., the piston in the master cylinder 131 is not sealed, causing leakage), the driver presses the brake pedal 3. Based on the driver's pressing depth, the internal controller of the brake pedal 3 automatically calculates the travel of the brake pedal 3 to determine the pressure increase ratio. At this time, if... Figure 3 As shown, the second controller 210 controls the first isolation valve 21 in the two brake subunits 20 to close and controls the second isolation valve 26 in the two control subunits to open. At the same time, the second controller 210 controls the second drive motor 272 to run. The second drive motor 272 drives the hydraulic pump 271 of the two brake subunits 20 to run, so as to extract the hydraulic medium in the first and second hydraulic chambers of the brake master cylinder 131 and the hydraulic medium in the accumulator 24, and respectively introduce them into the four brakes 7 for pressure building of the brakes 7, thereby realizing the braking of the vehicle.

[0058] In the above-described embodiments, the brake pedal 3 is communicatively connected to the first controller 12 of the first braking unit 1 and the second controller 210 of the second braking unit 2. The driver's foot feel when pressing the brake pedal 3 comes from the simulation of the brake pedal 3 itself. The driver's foot feel remains unchanged, avoiding the psychological change of driver panic caused by loss of pedal feel and improving safety.

[0059] In addition, the second controller 210 is connected to the brake pedal 3 via the second wiring harness 5, which allows the second braking unit 2 and the brake pedal 3 to be decoupled. That is, the ratio between the travel of the brake pedal 3 and the braking force of the second braking unit 2 is adjustable and not a fixed ratio.

[0060] The first braking unit 1 and the second braking unit 2 work together to build up pressure for braking. When the hydraulic braking system is functioning normally (both the first braking unit 1 and the second braking unit 2 are available), and the pressure boosting capacity of the first braking unit 1 is insufficient, the first braking unit 1 and the second braking unit 2 work together to boost pressure. When the driver depresses the brake pedal 3, the internal controller of the brake pedal 3 automatically calculates the travel of the brake pedal 3 based on the driver's depressing depth and simultaneously transmits this information to the first controller 12 of the first braking unit 1, the second controller 210 of the second braking unit 2, and the vehicle controller. The first controller 12 determines the pressure boosting ratio based on the travel of the brake pedal 3 and controls the operation of the first drive motor 1322. The first drive motor 1322 drives the servo hydraulic cylinder 1321. During operation, the servo hydraulic cylinder 1321 pushes the master brake cylinder 131, allowing the hydraulic medium in the oil tank 11 to pass through the master brake cylinder 131, the first isolation valve 21, and the inlet valve 22 before entering the brake 7 for pressure building. When the hydraulic braking system pressure is insufficient (e.g., due to heat fade), the second controller 210 controls the closure of each first isolation valve 21 in the second braking unit 2 and controls the opening of each second isolation valve 26 in the second braking unit 2. The second braking unit 2 also controls the second drive motor 272 to drive two hydraulic pumps 271. The two hydraulic pumps 271 draw hydraulic medium from the first and second hydraulic chambers of the master brake cylinder 131 and from the accumulator 24, respectively. Figure 4As shown, the hydraulic medium is supplied to the brake 7 after passing through the first sub-hydraulic flow path 2b and the hydraulic branch flow path 2a to build up pressure for braking. Since the brake pedal 3 is controlled by the first brake unit 1 and the second brake unit 2, the feedback of the brake pedal 3 force to the driver remains constant.

[0061] When the ABS anti-lock braking system of the first braking unit 1 is activated, and the hydraulic braking system enters the ABS anti-lock braking state, the first drive motor 1322 of the first braking unit 1 reciprocates (forward and reverse) to replenish or release the hydraulic medium in the brake 7. Specifically, when it is necessary to replenish the hydraulic medium in the brake 7, the first controller 12 can control the first motor to rotate forward (e.g., clockwise rotation is considered forward rotation). The first motor drives the servo hydraulic cylinder 1321, which in turn drives the brake master cylinder 131. The brake master cylinder 131 then introduces the hydraulic medium from the oil tank 11 into the brake 7 through the first isolation valve 21 and the inlet valve 22. When it is necessary to release some of the hydraulic medium in the brake 7, the first controller 12 can control the first motor to rotate in reverse (e.g., counterclockwise rotation is considered reverse rotation). The first motor drives the servo hydraulic cylinder 1321, which in turn drives the brake master cylinder 131. Figure 5 As shown, the master cylinder 131 draws a portion of the hydraulic medium in the brake 7 back to the master cylinder 131 after passing through the inlet valve 22 and the first isolation valve 21, and then the master cylinder 131 inputs the hydraulic medium into the oil tank 11.

[0062] In the above embodiments, when the vehicle controller determines that the braking force is too large, the vehicle controller sends a pressure reduction command to the first controller 12. The first controller 12 can control the first motor to reverse, so that the first drive motor 1322 drives the servo hydraulic cylinder 1321 to run. The servo hydraulic cylinder 1321 drives the brake master cylinder 131 to operate. The brake master cylinder 131 draws part of the hydraulic medium in the brake 7 back to the brake master cylinder 131 after passing through the inlet valve 22 and the first isolation valve 21. Then the brake master cylinder 131 inputs the hydraulic medium into the oil tank 11. When the vehicle controller determines that the braking force is too small and needs to be appropriately pressurized, the vehicle controller sends a pressurization command to the first controller 12. The first controller 12 can control the first motor to rotate forward, so that the first drive motor 1322 drives the servo hydraulic cylinder 1321 to run. The servo hydraulic cylinder 1321 drives the brake master cylinder 131 to operate. The brake master cylinder 131 introduces the hydraulic medium in the oil tank 11 into the brake 7 after passing through the first isolation valve 21 and the inlet valve 22.

[0063] The second braking unit 2 has ABS anti-lock braking, such as Figure 6 As shown, when the hydraulic braking system enters the ABS state, the second controller 210 controls the drain valve 23 to open, so as to pass part of the hydraulic medium in the brake 7 into the accumulator 24, so as to reduce the pressure of the brake 7 and realize the anti-lock braking of the wheels.

[0064] In the above implementation, when pressure is applied to the brake 7, if the vehicle controller determines that the braking force is too large, the vehicle controller sends a pressure reduction command to the second controller 210. The second controller 210 controls the drain valve 23 to open, and part of the hydraulic medium in the brake 7 can enter the accumulator 24 through the drain valve 23 to reduce the pressure on the brake 7 and achieve anti-lock braking of the wheels.

[0065] In some embodiments, when the accumulators 24 in the two brake subunits 20 are fully charged, the hydraulic medium in the two accumulators 24 can be respectively introduced into the first hydraulic chamber and the second hydraulic chamber of the brake master cylinder 131, and then the hydraulic medium can be introduced into the oil tank 11 through the brake master cylinder 131. For example, the second isolation valve 26 can be opened so that the hydraulic medium in the accumulators 24 enters the main hydraulic flow path 6 after passing through the second isolation valve 26, and then enters the oil tank 11 through the brake master cylinder 131.

[0066] When the brake 7 is depressurized and released (the brake 7 is pressurized to disengage the wheel and allow the wheel to rotate), the first controller 12 controls the first drive motor 1322 to run, the first drive motor 1322 drives the servo hydraulic cylinder 1321 to run, and the servo hydraulic cylinder 1321 drives the brake master cylinder 131 to move, so that the hydraulic medium in the brake 7 enters the brake master cylinder 131 through the hydraulic branch path 2a and the main hydraulic flow path 6, and then flows into the oil tank 11; or, the second controller 210 controls the inlet valve 22 to close and controls the drain valve 23 to open, so that the hydraulic medium in the brake 7 can flow into the accumulator 24 to achieve depressurization of the brake 7.

[0067] A second aspect of this disclosure provides a control method for a hydraulic braking system, including the hydraulic braking system described above, such as... Figure 7 As shown, the method includes: S100, Braking, the first power generation component and / or the second power generation component are respectively used to deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal; S200, release, the first power generation component or the second power generation component are respectively used to retract the hydraulic medium in the brake according to the brake signal from the brake pedal.

[0068] In some embodiments, the method by which the first power generating assembly 13 and / or the second power generating assembly 27 respectively deliver the hydraulic medium of the first braking unit 1 to the brake 7 through the second braking unit 2 according to the braking signal of the brake pedal 3 includes: The first braking unit 1 applies the brake, and the first driving mechanism 132 drives the master cylinder 131 according to the braking signal from the brake pedal 3, so that the hydraulic medium in the oil tank 11 is filled into the brake 7 through the master cylinder 131, the first isolation valve 21 and the inlet valve 22.

[0069] The second braking unit 2 brakes, and the second drive motor 272 drives the hydraulic pump 271 according to the braking signal of the brake pedal 3, so that the hydraulic medium in the oil tank 11 is filled into the brake 7 through the brake master cylinder 131, the second isolation valve 26 and the inlet valve 22. The first braking unit 1 and the second braking unit 2 engage in joint braking. The first drive mechanism 132 drives the master cylinder 131 according to the braking signal from the brake pedal 3, so that the hydraulic medium in the oil tank 11 is filled into the brake 7 through the master cylinder 131, the first isolation valve 21 and the inlet valve 22. The first isolation valve 21 is closed, and the second drive motor 272 drives the hydraulic pump 271, so that the hydraulic medium in the oil tank 11 is filled into the brake 7 through the master cylinder 131, the second isolation valve 26 and the inlet valve 22.

[0070] In the above method, when the first braking unit 1 and the second braking unit 2 brake together, when the first drive mechanism 132 drives the master cylinder 131 according to the braking signal of the brake pedal 3, so that the hydraulic medium in the oil tank 11 is filled into the brake 7 through the master cylinder 131, the first isolation valve 21 and the inlet valve 22, if the vehicle brake 7 determines that the system pressure is insufficient, the vehicle brake 7 sends a command to the second controller 210. The second brake 7 closes the first isolation valve 21 in each braking subunit 20 and opens the second isolation valve 26. The second controller 210 controls the second drive motor 272 to drive the hydraulic pump 271 to run, so that the hydraulic medium in the oil tank 11 is filled into the brake 7 after passing through the master cylinder 131, the second isolation valve 26 and the inlet valve 22.

[0071] In addition, the processes of braking by the first braking unit 1, braking by the second braking unit 2, and combined braking by the first braking unit 1 and the second braking unit 2 can be referred to the description in the hydraulic braking system provided in the first aspect of this disclosure, and will not be repeated here.

[0072] Additionally, the method by which the first power generation assembly 13 or the second power generation assembly 27 retracts the hydraulic medium in the brake 7 according to the brake signal from the brake pedal 3 includes: The first controller 12 controls the first drive motor 1322 to operate, the first drive motor 1322 drives the servo hydraulic cylinder 1321 to operate, and the servo hydraulic cylinder 1321 drives the brake master cylinder 131 to operate, so that the hydraulic medium in the brake 7 enters the brake master cylinder 131 through the hydraulic branch path 2a and the main hydraulic flow path 6, and then flows into the oil tank 11; or, the second controller 210 controls the inlet valve 22 to close and controls the drain valve 23 to open, so that the hydraulic medium in the brake 7 can flow into the accumulator 24 to reduce the pressure of the brake 7.

[0073] This third aspect of the disclosure provides a vehicle including a hydraulic braking system as provided in the first aspect of the disclosure. The vehicle may include a fuel-powered vehicle or a hybrid vehicle, etc., without limitation herein.

[0074] 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.

[0075] 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.

[0076] 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: Brakes are used to brake the wheels; The first braking unit includes a first power generation component for communicatively connecting with the brake pedal; and The second braking unit is connected to the first braking unit and the brake respectively. The second braking unit also includes a second power generation component that is communicatively connected to the brake pedal. The first power generation component is configured to: deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal, or retract the hydraulic medium in the brake; The second power generation component is configured to: deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal, or retract the hydraulic medium in the brake.

2. The hydraulic braking system according to claim 1, characterized in that, The first braking unit further includes an oil tank, and the first power generation component includes a master cylinder and a first drive mechanism. The master cylinder is connected to the oil tank and the second braking unit respectively through a hydraulic flow path. The first drive mechanism is communicatively connected to the brake pedal and is used to drive the master cylinder according to the brake signal from the brake pedal.

3. The hydraulic braking system according to claim 2, characterized in that, The first drive mechanism includes a servo hydraulic cylinder and a first drive motor connected to the servo hydraulic cylinder, and the first drive motor is communicatively connected to the brake pedal.

4. The hydraulic braking system according to claim 1, characterized in that, The second power generation component includes a hydraulic pump and a second drive motor. The hydraulic pump is connected to the first braking unit and the brake respectively through a hydraulic flow path. The second drive motor is signal-connected to the brake pedal and is used to drive the hydraulic pump according to the braking signal from the brake pedal.

5. The hydraulic braking system according to any one of claims 1 to 4, characterized in that, The first braking unit includes a first controller, which is communicatively connected to the brake pedal via a first wiring harness; and / or The second braking unit includes a second controller, which is communicatively connected to the brake pedal via a second wiring harness.

6. The hydraulic braking system according to claim 2, characterized in that, The second braking unit includes at least two braking subunits, each subunit comprising two hydraulic branch paths respectively connected to one of the brakes, and the two hydraulic branch paths also respectively connected to the master cylinder via a main hydraulic path. The main hydraulic flow path is equipped with a first isolation valve for controlling the on / off state of the main hydraulic flow path, and each hydraulic branch flow path is equipped with an inlet valve for controlling the on / off state of the hydraulic branch flow path.

7. The hydraulic braking system according to claim 6, characterized in that, The braking subunit also includes a first sub-hydraulic flow path and two return flow paths. The first sub-hydraulic flow path is connected in parallel to the first isolation valve. A hydraulic pump and a second isolation valve capable of controlling the on / off state of the first sub-hydraulic flow path are provided on the first sub-hydraulic flow path. Each of the two return flow paths is respectively connected to one of the hydraulic branch paths, and the connection point is located between the inlet valve and the brake. Each return flow path is also connected between the second isolation valve and the hydraulic pump. Each return flow path is provided with a drain valve for controlling the opening and closing of the return flow path.

8. A control method for a hydraulic braking system, characterized in that, For a hydraulic braking system as described in any one of claims 1-7, the method comprises: Braking, wherein the first power generation component and / or the second power generation component are respectively used to deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal; Release, wherein the first power generation component or the second power generation component is respectively used to retract the hydraulic medium in the brake according to the braking signal of the brake pedal.

9. The control method for the hydraulic braking system according to claim 8, characterized in that, The method by which the first power generation component and / or the second power generation component respectively deliver the hydraulic medium of the first braking unit to the brake through the second braking unit according to the braking signal of the brake pedal includes: The first braking unit applies the brake, and the first driving mechanism drives the master cylinder according to the braking signal from the brake pedal, so that the hydraulic medium in the oil tank is filled into the brake through the master cylinder, the first isolation valve and the inlet valve. The second braking unit brakes, and the second drive motor drives the hydraulic pump according to the braking signal of the brake pedal, so that the hydraulic medium in the oil tank is filled into the brake through the brake master cylinder, the second isolation valve and the inlet valve; The first braking unit and the second braking unit engage braking in combination. The first drive mechanism drives the master cylinder according to the braking signal from the brake pedal, so that the hydraulic medium in the oil tank is filled into the brake through the master cylinder, the first isolation valve, and the inlet valve. The first isolation valve is closed, and the second drive motor drives the hydraulic pump, so that the hydraulic medium in the oil tank is filled into the brake through the master cylinder, the second isolation valve, and the inlet valve.

10. A vehicle, characterized in that, Includes the hydraulic braking system as described in any one of claims 1-7.

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