An electronic hydraulic brake system

Abstract

The present application discloses an electronic hydraulic braking system, including a pedal, an oil tank module, a brake master cylinder, a pressure building unit and a wheel brake unit. Two brake pistons are slidably provided inside the brake master cylinder, and the two brake pistons divide the inside of the brake master cylinder into three brake chambers. In an embodiment of the present application, the above-mentioned electronic hydraulic braking system is adopted, and three brake chambers are arranged in the brake master cylinder. When the pedal and the brake master cylinder are decoupled, the braking control of the wheel brake unit can be achieved through the cooperation of the pressure building unit and the first linkage solenoid valve or the second linkage solenoid valve. At the same time, the pressure building cylinder of the pressure building unit can be connected with the brake master cylinder and the wheel brake unit, and oil can be replenished when the brake master cylinder and the wheel brake unit fail to leak oil, thereby realizing the oil leakage fault repair of the braking system and further improving the safety redundancy capability of the braking system.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking, and particularly to an electronic hydraulic braking system. Background Art

[0002] The electronic hydraulic braking system is developed from the traditional hydraulic braking system. It replaces the vacuum booster with a motor and a transmission mechanism, and replaces the original hydraulic brake pedal with an electronic brake pedal, so that there is no mechanical connection between the brake pedal and the brake.

[0003] In the existing electronic hydraulic braking system, the brake pedal is mechanically connected to the piston in the master cylinder. The system isolates the pedal hydraulic circuit and the wheel-end hydraulic circuit through the CSV (solenoid valve) to achieve the decoupling of the braking force and the pedal force. The PSU (Pressure Supply Unit) directly pressurizes the brake through a dual hydraulic pipeline to establish the braking force. The wheel-end hydraulic circuit sucks the brake fluid by generating pressure through the piston return of the PSU, thereby realizing the replenishment of the circuit.

[0004] In the above existing technology, most of the electro-hydraulic brake-by-wire solutions based on the dual-chamber master cylinder configuration are limited by the number of chambers in the master cylinder. When the braking system performs failure backup, the control form of the oil circuit is relatively single. When some oil circuits of the failure backup fail, it is difficult to ensure the braking effectiveness, and the overall anti-fault redundancy ability is poor. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the present invention provides an electronic hydraulic braking system with flexible control and a large safety redundancy.

[0006] To achieve the above object, the present invention is realized through the following technical solutions.

[0007] The present application provides an electronic hydraulic braking system, including a pedal, an oil pot module, a brake master cylinder, a pressure building unit, and a wheel braking unit. The pedal and the brake master cylinder are coupled and connected. The oil pot module is respectively connected to the brake master cylinder, the pressure building unit, and the wheel braking unit, and is used to provide oil fluid to the brake master cylinder, the pressure building unit, and the wheel braking unit;

[0008] Two brake pistons are slidably arranged inside the brake master cylinder, and the two brake pistons sequentially divide the inside of the brake master cylinder into a first brake chamber, a second brake chamber, and a third brake chamber;

[0009] The wheel braking unit includes a first wheel group and a second wheel group. The hydraulic pressure input end of the first wheel group is connected to the second brake chamber through a first wheel-end brake pipeline, and the hydraulic pressure input end of the second wheel group is connected to the third brake chamber through a second wheel-end brake pipeline;

[0010] The pressure - building unit includes a driving unit and a pressure - building cylinder connected to the driving unit. The hydraulic pressure output end of the pressure - building cylinder is connected with a first linkage pipeline and a second linkage pipeline in parallel. The first linkage pipeline is communicated with a first braking cavity through a first linkage solenoid valve, and the second linkage pipeline is communicated with a first wheel - end braking pipeline through a second linkage solenoid valve;

[0011] Wherein, the pressure - building cylinder can realize the hydraulic pressure transmission to the first linkage pipeline and / or the second linkage pipeline through the drive of the driving unit.

[0012] Further defined, in an above - mentioned electronic hydraulic braking system, one end of the second linkage pipeline far from the pressure - building cylinder is communicated with an oil pot module, and a first one - way valve is arranged on the second linkage pipeline. The communication direction of the first one - way valve is from the oil pot module to the pressure - building cylinder side direction;

[0013] Wherein, there is a connection point between the second linkage pipeline and the first wheel - end braking pipeline. The second linkage solenoid valve is arranged between the pressure - building cylinder and the connection point, and the first one - way valve is arranged between the oil pot module and the connection point.

[0014] Further defined, in an above - mentioned electronic hydraulic braking system, an oil - replenishing pipeline is communicated between the oil pot module and the second wheel - end braking pipeline, and a second one - way valve is arranged on the oil - replenishing pipeline;

[0015] Wherein, the communication direction of the second one - way valve is from the oil pot module to the wheel braking unit side direction.

[0016] Further defined, in an above - mentioned electronic hydraulic braking system, a pressure - building oil return pipeline is arranged between the oil pot module and the pressure - building cylinder.

[0017] Further defined, in an above - mentioned electronic hydraulic braking system, the wheel braking unit includes a first wheel group and a second wheel group. The first wheel group is connected to the brake master cylinder through a first wheel - end braking pipeline, and the second wheel group is connected to the brake master cylinder through a second wheel - end braking pipeline;

[0018] The first wheel group and the second wheel group each include at least one wheel cylinder assembly, and the wheel cylinder assembly is equipped with a pressure - increasing valve and a pressure - reducing valve;

[0019] Wherein, the pressure - increasing valves of the first wheel group and the second wheel group are respectively communicated with the first wheel - end braking pipeline and the second wheel - end braking pipeline, and the pressure - reducing valves of the first wheel group and the second wheel group are communicated with the oil pot module through wheel - end oil return pipelines.

[0020] It is further defined that the above-mentioned electronic hydraulic brake system further includes a decoupling cylinder connected to the pedal, a decoupling pipeline is provided between the decoupling cylinder and the first brake chamber of the brake master cylinder, and a decoupling solenoid valve is provided on the decoupling pipeline;

[0021] Wherein, the oil pot module is connected to the decoupling cylinder and can provide oil to the decoupling cylinder.

[0022] It is further defined that the above-mentioned electronic hydraulic brake system further includes a displacement sensor for monitoring the pedal stroke, and / or further includes a first pressure sensor for monitoring the hydraulic pressure of the decoupling cylinder;

[0023] Wherein, the first pressure sensor is connected to the hydraulic pressure output end of the decoupling cylinder and is connected in parallel with the decoupling solenoid valve.

[0024] It is further defined that the above-mentioned electronic hydraulic brake system further includes a second pressure sensor for monitoring the output fluid pressure of the pressure-building cylinder.

[0025] Further defined, in the above-mentioned electronic hydraulic brake system, the oil pot module comprises at least a first oil chamber, a second oil chamber, a third oil chamber, and a fourth oil chamber;

[0026] Wherein, the first oil chamber is connected to the decoupling cylinder;

[0027] And / or, the second oil chamber and the third oil chamber are communicated with the second brake chamber and the third brake chamber respectively;

[0028] And / or, the fourth oil chamber is connected to the second linkage pipeline, the oil replenishment pipeline, the pressure-building oil return pipeline, and the wheel-end oil return pipeline.

[0029] It is further defined that the above-mentioned electronic hydraulic brake system further includes a pedal feel simulation unit connected to the decoupling cylinder fluid pressure output end;

[0030] The pedaling feeling simulation unit is connected in parallel with the decoupling electromagnetic valve, and includes a pedaling feeling simulator and a simulation electromagnetic valve arranged between the pedaling feeling simulator and the decoupling cylinder.

[0031] The present invention has at least the following beneficial effects:

[0032] 1. Three brake chambers are set in the brake master cylinder. When the pedal and the brake master cylinder are decoupled, the brake control of the wheel brake unit can be realized through the cooperation of the pressure building unit and the first linkage solenoid valve or the second linkage solenoid valve. At the same time, the pressure building cylinder of the pressure building unit can be connected with the brake master cylinder and the wheel brake unit. When the brake master cylinder and the wheel brake unit fail to leak oil, they can be replenished with oil, thereby realizing the repair of the oil leakage fault of the brake system and further improving the safety redundancy capability of the brake system; ​​​

[0033] 2. A decoupling cylinder is arranged between the pedal and the master cylinder, so that the pedal indirectly controls the hydraulic pressure transmission of the master cylinder to the wheel braking unit through the decoupling cylinder. At this time, the stepping stroke of the pedal is not limited by the structure of the master cylinder, and the decoupling cylinder can provide a larger stepping adjustment range for the pedal, thereby further improving the use comfort of the electro-hydraulic braking system;

[0034] 3. Since the second braking chamber and the third braking chamber are respectively communicated with the independent second oil chamber and the third oil chamber in the oil pot module, when hydraulic oil leakage occurs in the master cylinder, the hydraulic oil in the first oil chamber and the fourth oil chamber will not leak synchronously, thereby ensuring the working state stability of the decoupling cylinder, the pressure building unit and the wheel braking unit, and improving the redundancy ability of the braking system. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the electro-hydraulic braking system according to the embodiment of the present application;

[0036] Figure 2 It is a schematic structural diagram of the electro-hydraulic braking system according to the embodiment of the present application;

[0037] Figure 3 It is a schematic structural diagram of the "master cylinder 500" part in the electro-hydraulic braking system according to the embodiment of the present application;

[0038] Figure 4 It is a schematic structural diagram of the "oil pot module 400" part in the electro-hydraulic braking system according to the embodiment of the present application;

[0039] Figure 5 It is a schematic structural diagram of the "pressure building unit 600" part in the electro-hydraulic braking system according to the embodiment of the present application;

[0040] Figure 6 It is a schematic structural diagram of the "pedal feel simulation unit 800" part in the electro-hydraulic braking system according to the embodiment of the present application;

[0041] Figure 7 It is a schematic structural diagram of the "wheel braking unit 700" part in the electro-hydraulic braking system according to the embodiment of the present application.

[0042] Reference Numerals

[0043] Pedal - 100, displacement sensor - 210, first pressure sensor - 220, second pressure sensor - 230, decoupling cylinder - 300, decoupling solenoid valve - 310, analog pipeline - 320, decoupling pipeline - 330, oil pot module - 400, first oil chamber - 410, second oil chamber - 420, third oil chamber - 430, fourth oil chamber - 440, brake master cylinder - 500, first brake piston - 510, second brake piston - 520, first brake chamber - 530, second brake chamber - 540, third brake chamber - 550, pressure - building unit - 600, motor - 610, pressure - building cylinder - 620, pressure - building oil return pipeline - 630, first linkage pipeline - 660, second linkage pipeline - 670, oil - replenishing pipeline - 680, wheel brake unit - 700, first wheel cylinder assembly - 710, first pressure - increasing valve - 711, first pressure - reducing valve - 712, second wheel cylinder assembly - 720, second pressure - increasing valve - 721, second pressure - reducing valve - 722, third wheel cylinder assembly - 730, third pressure - increasing valve - 731, third pressure - reducing valve - 732, fourth wheel cylinder assembly - 740, fourth pressure - increasing valve - 741, fourth pressure - reducing valve - 742, first wheel - end brake pipeline - 750, second wheel - end brake pipeline - 760, wheel - end oil return pipeline - 770, pedal - feeling simulation unit - 800, pedal - feeling simulator - 810, simulation solenoid valve - 820, first linkage solenoid valve - 950, second linkage solenoid valve - 960, first check valve - 970, second check valve - 980. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0045] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0046] Next, in conjunction with the accompanying drawings, the electro - hydraulic braking system provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0047] Embodiment 1

[0048] As Figures 1 to 7 shown, an embodiment of the present application provides an electro - hydraulic braking system, including a pedal 100, an oil pot module 400, a brake master cylinder 500, a pressure - building unit 600, and a wheel braking unit 700.

[0049] The pedal 100 is coupled to the brake master cylinder 500. Inside the brake master cylinder 500, a first brake piston 510 and a second brake piston 520 are slidably arranged at intervals. The first brake piston 510 and the second brake piston 520 divide the inside of the brake master cylinder 500 into a first brake chamber 530, a second brake chamber 540, and a third brake chamber 550.

[0050] The first brake chamber 530 is located on the side of the first brake piston 510 away from the second brake piston 520. The second brake chamber 540 is located between the first brake piston 510 and the second brake piston 520. The third brake chamber 550 is located on the side of the second brake piston 520 away from the first brake piston 510.

[0051] The wheel braking unit 700 includes a first wheel group and a second wheel group. The hydraulic pressure input end of the first wheel group is connected to the second brake chamber 540 through a first end brake pipeline 750. The hydraulic pressure input end of the second wheel group is connected to the third brake chamber 550 through a second end brake pipeline 760.

[0052] The pressure - building unit 600 includes a driving unit and a pressure - building cylinder 620 connected to the driving unit. The hydraulic pressure output end of the pressure - building cylinder 620 is connected with a first linkage pipeline 660 and a second linkage pipeline 670 connected in parallel. The first linkage pipeline 660 is communicated with the first brake chamber 530 through a first linkage solenoid valve 950. The second linkage pipeline 670 is communicated with the first end brake pipeline 750 through a second linkage solenoid valve 960.

[0053] The oil pot module 400 is respectively connected to the brake master cylinder 500, the pressure - building unit 600, and the wheel braking unit 700, and is used to supply oil to the brake master cylinder 500, the pressure - building unit 600, and the wheel braking unit 700.

[0054] Wherein, the pressure - building cylinder 620 can realize the hydraulic pressure transmission to the first linkage pipeline 660 and / or the second linkage pipeline 670 through the drive of the driving unit.

[0055] It can be understood that when the pedal 100 is coupled to the brake master cylinder 500 and the first linkage solenoid valve 950 and the second linkage solenoid valve 960 are closed, during the process of the operator stepping on the pedal 100, the hydraulic pressure transmission to the brake master cylinder 500 can be realized through the displacement of the pedal 100, and the brake master cylinder 500 can realize the brake pressure building of the wheel braking unit 700 under the control of the pedal 100;

[0056] When the pedal 100 is decoupled from the master cylinder 500, the pressure - building unit 600 can perform braking control on the wheel braking unit 700, specifically including:

[0057] When the first linkage solenoid valve 950 is opened and the second linkage solenoid valve 960 is closed, the driving unit can control the piston in the pressure - building cylinder 620 to move linearly to output hydraulic pressure to the first brake chamber 530, thereby pushing the first brake piston 510 and the second brake piston 520, so that the hydraulic oil in the second brake chamber 540 and the third brake chamber 550 is respectively output to the first wheel set and the second wheel set of the wheel braking unit 700 through the first wheel - end brake pipeline 750 and the second wheel - end brake pipeline 760, and then the braking control of the wheel braking unit 700 is realized;

[0058] When the second linkage solenoid valve 960 is opened and the first linkage solenoid valve 950 is closed, the driving unit can control the piston in the pressure - building cylinder 620 to move linearly to output hydraulic pressure to the first wheel - end brake pipeline 750. A part of the hydraulic oil entering the first wheel - end brake pipeline 750 is output to the first wheel set of the wheel braking unit 700, and the other part is output to the second brake chamber 540. The second brake piston 520 moves linearly away from the first brake piston 510 under the action of the hydraulic pressure in the second brake chamber 540, so that the hydraulic oil in the third brake chamber 550 is output to the second wheel set of the wheel braking unit 700 through the second wheel - end brake pipeline 760, and then the braking control of the wheel braking unit 700 is realized.

[0059] In the embodiment of the present application, by adopting the above - mentioned electronic hydraulic braking system, three brake chambers are arranged in the master cylinder 500. In the decoupled state of the pedal 100 and the master cylinder 500, through the cooperation of the pressure - building unit 600 and the first linkage solenoid valve 950 or the second linkage solenoid valve 960, the braking control of the wheel braking unit 700 can be realized. At the same time, the pressure - building cylinder 620 of the pressure - building unit 600 can be communicated with the master cylinder 500 and the wheel braking unit 700, and can supply oil to them when the master cylinder 500 and the wheel braking unit 700 leak and fail, so as to realize the repair of the oil - leakage fault of the braking system and further improve the safety redundancy ability of the braking system.

[0060] It can be understood that the connection form between the master cylinder 500 and the wheel braking unit 700 is not limited to the above - mentioned one. For example, the first wheel - end brake pipeline 750 of the first wheel set can be set to be communicated with the third brake chamber 550, and the second wheel - end brake pipeline 760 of the second wheel set can be communicated with the second brake chamber 540, as long as the hydraulic pressure transmission from the master cylinder 500 to the two wheel sets of the wheel braking unit 700 can be realized, which will not be elaborated here.

[0061] In a preferred embodiment, asFigure 1 , Figure 2 , Figure 5 As shown, the driving unit is specifically set as the motor 610 connected to the pressure - building cylinder 620, and the pressure - building cylinder 620 can realize the hydraulic pressure transmission to the wheel braking unit 700 through the drive of the motor 610.

[0062] It can be understood that the structural form of the pressure - building unit 600 is not limited to the above - mentioned one. The motor 610 can adopt other driving structures, such as a connecting - rod structure, a rack - and - pinion structure, etc., as long as it can realize the driving of the hydraulic pressure output of the pressure - building cylinder 620, which will not be elaborated here.

[0063] In a preferred embodiment, as Figure 1 , Figure 2 , Figure 7 shown, a pressure - building oil return pipeline 630 is provided between the oil pot module 400 and the pressure - building unit 600.

[0064] Among them, the pressure - building oil return pipeline 630 is communicated with the oil inlet end of the pressure - building cylinder 620, and the oil pot module 400 can supply hydraulic oil to the pressure - building cylinder 620 through the pressure - building oil return pipeline 630.

[0065] In a preferred embodiment, as Figure 1 , Figure 2 shown, one end of the second linkage pipeline 670 far from the pressure - building cylinder 620 is communicated with the oil pot module 400, and a first one - way valve 970 is provided on the second linkage pipeline 670. The communication direction of the first one - way valve 970 is from the oil pot module 400 to the pressure - building cylinder 620 side.

[0066] Among them, there is a connection point between the second linkage pipeline 670 and the first - round - end braking pipeline 750. The second linkage solenoid valve 960 is arranged between the pressure - building cylinder 620 and the connection point, and the first one - way valve 970 is arranged between the oil pot module 400 and the connection point.

[0067] It can be understood that when the pressure - building cylinder 620 builds negative pressure, the first one - way valve 970 on the second linkage pipeline 670 is conducted, and the oil pot module 400 can supply oil to the pressure - building cylinder 620 and the brake master cylinder 500 through the second linkage pipeline 670.

[0068] In a preferred embodiment, as Figure 1 , Figure 2 shown, a supplementary oil pipeline 680 is communicated between the oil pot module 400 and the second - round - end braking pipeline 760, and a second one - way valve 980 is provided on the supplementary oil pipeline 680.

[0069] Among them, the communication direction of the second one - way valve 980 is from the oil pot module 400 to the wheel braking unit 700 side.

[0070] It can be understood that when the master brake cylinder 500 builds negative pressure, the second one-way valve 980 on the oil replenishment pipeline 680 is conducted, and the oil pot module 400 can replenish oil to the master brake cylinder 500 through the oil replenishment pipeline 680 and the second wheel-end brake pipeline 760.

[0071] In a preferred embodiment, as Figure 1 , Figure 2 , Figure 7 shown, the first wheel set includes a first wheel cylinder assembly 710 and a second wheel cylinder assembly 720. The first wheel cylinder assembly 710 is equipped with a first booster valve 711 and a first pressure reducing valve 712, and the second wheel cylinder assembly 720 is equipped with a second booster valve 721 and a second pressure reducing valve 722.

[0072] Among them, the first booster valve 711 and the second booster valve 721 are respectively connected to the first wheel-end brake pipeline 750.

[0073] In a preferred embodiment, as Figure 1 , Figure 2 , Figure 7 shown, the second wheel set includes a third wheel cylinder assembly 730 and a fourth wheel cylinder assembly 740. The third wheel cylinder assembly 730 is equipped with a third booster valve 731 and a third pressure reducing valve 732, and the fourth wheel cylinder assembly 740 is equipped with a fourth booster valve 741 and a fourth pressure reducing valve 742.

[0074] Among them, the third booster valve 731 and the fourth booster valve 741 are respectively connected to the second wheel-end brake pipeline 760.

[0075] It can be understood that the structural forms of the first wheel set and the second wheel set are not limited to the above one. Specifically, the first wheel set and the second wheel set respectively correspond to the front and rear wheels of the vehicle and include at least one wheel cylinder assembly.

[0076] In a preferred embodiment, as Figure 1 , Figure 2 , Figure 7 shown, a wheel-end oil return pipeline 770 is provided between the oil pot module 400 and the wheel brake unit 700.

[0077] Among them, the first pressure reducing valve 712, the second pressure reducing valve 722, the third pressure reducing valve 732, and the fourth pressure reducing valve 742 are respectively connected to the wheel-end oil return pipeline 770.

[0078] It can be understood that when the wheel braking unit 700 performs braking, the master brake cylinder 500 or the pressure building unit 600 can deliver hydraulic pressure to the first wheel set and the second wheel set through the first wheel end braking pipeline 750 and the second wheel end braking pipeline 760. The first pressure increasing valve 711, the second pressure increasing valve 721, the third pressure increasing valve 731, and the fourth pressure increasing valve 741 are opened, and the first pressure reducing valve 712, the second pressure reducing valve 722, the third pressure reducing valve 732, and the fourth pressure reducing valve 742 are closed, so as to realize the pressure maintaining braking of the first wheel cylinder assembly 710, the second wheel cylinder assembly 720, the third wheel cylinder assembly 730, and the fourth wheel cylinder assembly 740. When the braking of the wheel braking unit 700 is released, the first pressure increasing valve 711, the second pressure increasing valve 721, the third pressure increasing valve 731, and the fourth pressure increasing valve 741 are closed, and the first pressure reducing valve 712, the second pressure reducing valve 722, the third pressure reducing valve 732, and the fourth pressure reducing valve 742 are opened. The first pressure reducing valve 712, the second pressure reducing valve 722, the third pressure reducing valve 732, and the fourth pressure reducing valve 742 return oil to the oil pot module 400 through the wheel end oil return pipeline 770, so as to realize the pressure relief of the first wheel cylinder assembly 710, the second wheel cylinder assembly 720, the third wheel cylinder assembly 730, and the fourth wheel cylinder assembly 740.

[0079] In a preferred embodiment, as Figure 1 , Figure 2 shown, it further includes a decoupling cylinder 300 connected to the pedal 100. The first braking chamber 530 of the master brake cylinder 500 is connected to the decoupling cylinder 300 through a decoupling solenoid valve 310. The oil pot module 400 is connected to the decoupling cylinder 300 and can supply oil to the decoupling cylinder 300.

[0080] Wherein, in the open state of the decoupling solenoid valve 310, the decoupling cylinder 300 can realize the delivery of hydraulic pressure to the master brake cylinder 500 through the displacement of the pedal 100, and the master brake cylinder 500 can realize the braking pressure building of the wheel braking unit 700 under the action of the hydraulic pressure delivered by the decoupling cylinder 300.

[0081] It can be understood that when the operator steps on the pedal 100, the pedal 100 moves and drives the piston in the decoupling cylinder 300 to move linearly. The oil in the decoupling cylinder 300 can be delivered into the master brake cylinder 500 through the decoupling solenoid valve 310. When the decoupling cylinder 300 delivers hydraulic pressure to the first braking chamber 530, the first braking piston 510 moves towards the side close to the second braking piston 520, and the pressures in the second braking chamber 540 and the third braking chamber 550 rise, thereby driving the hydraulic oil to be delivered to the first wheel set and the second wheel set through the first wheel end braking pipeline 750 and the second wheel end braking pipeline 760, and further realizing the braking pressure building of the wheel braking unit 700.

[0082] In the embodiment of the present application, an electronic hydraulic braking system as described above is adopted. A decoupling cylinder 300 is arranged between the pedal 100 and the master cylinder 500, so that the pedal 100 indirectly controls the hydraulic pressure transmission of the master cylinder 500 to the wheel braking unit 700 through the decoupling cylinder 300. At this time, the stepping stroke of the pedal 100 is not restricted by the structure of the master cylinder 500. The decoupling cylinder 300 can provide a larger stepping adjustment range for the pedal 100, thereby further improving the use comfort of the electronic hydraulic braking system.

[0083] In a preferred embodiment, as Figure 1 、 Figure 2 shown, a decoupling pipeline 330 is provided between the hydraulic pressure output end of the decoupling cylinder 300 and the master cylinder 500, and a decoupling solenoid valve 310 is arranged on the decoupling pipeline 330.

[0084] In a preferred embodiment, as Figure 1 、 Figure 2 shown, it further includes a displacement sensor 210 for monitoring the stepping stroke of the pedal 100.

[0085] In a preferred embodiment, as Figure 1 、 Figure 2 shown, it further includes a first pressure sensor 220 for monitoring the hydraulic pressure of the decoupling cylinder 300.

[0086] It can be understood that there is a proportional relationship between the stepping stroke of the pedal 100 and the output hydraulic pressure of the decoupling cylinder 300. By monitoring the stepping stroke of the pedal 100 and the output hydraulic pressure of the decoupling cylinder 300, the control accuracy of the braking degree of the wheel braking unit 700 by the stepping stroke of the pedal 100 can be improved, and the control reliability of the hydraulic braking system can be ensured.

[0087] In a preferred embodiment, as Figure 1 、 Figure 2 shown, the first pressure sensor 220 is connected to the hydraulic pressure output end of the decoupling cylinder 300 and is connected in parallel with the decoupling solenoid valve 310.

[0088] In a preferred embodiment, the pressure building unit 600 is coupled with the pedal 100.

[0089] It can be understood that the pressure building unit 600 can obtain the output result of the displacement sensor 210 (i.e., the stepping stroke of the pedal 100) when the decoupling solenoid valve 310 is closed. When the operator steps on the pedal 100, the motor 610 controls the piston in the pressure building cylinder 620 to move linearly based on the stepping stroke of the pedal 100 to output a corresponding hydraulic pressure, thereby ensuring the control accuracy of the braking force of the wheel braking unit 700.

[0090] In a preferred embodiment, asFigure 1 、 Figure 2 As shown, it also includes a second pressure sensor 230 for monitoring the output fluid pressure of the pressure-building cylinder 620.

[0091] It can be understood that the second pressure sensor 230 can monitor the output hydraulic pressure of the pressure-building cylinder 620, and by coordinating with the monitoring result of the displacement sensor 210, the output hydraulic pressure of the pressure-building unit 600 can also be associated with the pedal stroke of the pedal 100. When the wheel brake unit 700 is braked by the pressure-building unit 600, the control accuracy of the pedal 100's pedal stroke on the wheel brake unit 700 is guaranteed.

[0092] In a preferred embodiment, as Figure 1 、 Figure 2 As shown in FIG. 1 , the second pressure sensor 230 is connected to the hydraulic pressure output end of the pressure-building cylinder 620 and is connected in parallel to the first linkage pipeline 660 and the second linkage pipeline 670.

[0093] In a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 4 As shown in FIG. 4 , the oil pot module 400 is provided with a plurality of independent oil chambers, one of which is connected to the oil inlet end of the decoupling cylinder 300 and is used to supply the hydraulic oil of the decoupling cylinder 300.

[0094] In a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 4 As shown in FIG. 1 , the oil tank module 400 is provided with a plurality of independent oil chambers, one of which is connected to the second linkage pipeline 670, the oil replenishment pipeline 680, the pressure-building oil return pipeline 630, and the wheel-end oil return pipeline 770.

[0095] In a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 4 As shown in FIG. 1 , the oil pot module 400 is provided with a first oil chamber 410, a second oil chamber 420, a third oil chamber 430, and a fourth oil chamber 440.

[0096] Among them, the first oil chamber 410 is connected to the oil inlet end of the decoupling cylinder 300, the fourth oil chamber 440 is connected to the second linkage pipeline 670, the oil replenishment pipeline 680, the pressure return oil pipeline 630, and the wheel end return oil pipeline 770, and the second oil chamber 420 and the third oil chamber 430 are respectively connected to the second brake chamber 540 and the third brake chamber 550 of the brake master cylinder 500.

[0097] ​​​​​​​​In the embodiments of the present application, by adopting the above-mentioned electronic hydraulic braking system, since the second braking chamber 540 and the third braking chamber 550 are respectively communicated with the independent second oil chamber 420 and the third oil chamber 430 in the oil pot module 400, when hydraulic oil leakage occurs in the brake master cylinder 500, the hydraulic oil in the first oil chamber 410 and the fourth oil chamber 440 will not leak synchronously, thereby ensuring the working state stability of the decoupling cylinder 300, the pressure building unit 600, and the wheel braking unit 700, and improving the redundancy of the braking system.

[0098] In a preferred embodiment, as Figure 1 、 Figure 2 shown, it further includes a pedal feel simulation unit 800 connected to the hydraulic pressure output end of the decoupling cylinder 300.

[0099] In a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 6 shown, the pedal feel simulation unit 800 is connected in parallel with the decoupling solenoid valve 310, and includes a pedal feel simulator 810 and a simulation solenoid valve 820 arranged between the pedal feel simulator 810 and the decoupling cylinder 300.

[0100] It can be understood that when the decoupling solenoid valve 310 is closed and the simulation solenoid valve 820 is opened, the hydraulic pressure output by the decoupling cylinder 300 will act on the pedal feel simulator 810, and the pedal feel simulator 810 can generate a reaction force, thereby simulating the braking damping of the user stepping on the pedal 100 and optimizing the feedback pedal feel of the braking system to the user.

[0101] In a preferred embodiment, as Figure 1 、 Figure 2 、 Figure 6 shown, a simulation pipeline 320 parallel to the decoupling pipeline 330 is provided between the pedal feel simulator 810 and the decoupling cylinder 300, and the simulation solenoid valve 820 is arranged on the simulation pipeline 320.

[0102] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0103] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. An electronic hydraulic brake system, characterized in that: It includes a pedal, an oil pot module, a brake master cylinder, a pressure building unit and a wheel brake unit, wherein the pedal and the brake master cylinder are coupled and connected, and the oil pot module is respectively connected to the brake master cylinder, the pressure building unit and the wheel brake unit, and is used to provide oil to the brake master cylinder, the pressure building unit and the wheel brake unit; Two brake pistons are slidably arranged inside the brake master cylinder, and the two brake pistons divide the inside of the brake master cylinder into a first brake chamber, a second brake chamber and a third brake chamber in sequence; The wheel brake unit comprises a first wheel group and a second wheel group, the hydraulic pressure input end of the first wheel group is connected to the second brake chamber via a first wheel end brake pipeline, and the hydraulic pressure input end of the second wheel group is connected to the third brake chamber via a second wheel end brake pipeline; The pressure building unit includes a driving unit and a pressure building cylinder connected to the driving unit, the hydraulic pressure output end of the pressure building cylinder is connected to a first linkage pipeline and a second linkage pipeline connected in parallel with each other, the first linkage pipeline is connected to the first brake chamber through a first linkage solenoid valve, and the second linkage pipeline is connected to the first wheel end brake pipeline through a second linkage solenoid valve; The second linkage pipeline is connected to the oil pot module at one end away from the pressure building cylinder, and a first one-way valve is provided on the second linkage pipeline, and the communication direction of the first one-way valve is from the oil pot module to one side of the pressure building cylinder; An oil replenishment pipeline is provided between the oil tank module and the second wheel end brake pipeline, and a second one-way valve is provided on the oil replenishment pipeline. The communication direction of the second one-way valve is from the oil tank module to one side of the wheel brake unit; A pressure-building oil return pipeline is provided between the oil pot module and the pressure-building cylinder; It also includes a decoupling cylinder connected to the pedal, a decoupling pipeline is provided between the decoupling cylinder and the first brake chamber of the brake master cylinder, a decoupling solenoid valve is provided on the decoupling pipeline, and the oil pot module is connected to the decoupling cylinder and can provide oil to the decoupling cylinder; The oil pot module at least includes a first oil chamber, a second oil chamber, a third oil chamber, and a fourth oil chamber; Wherein, the pressure-building cylinder can realize the transmission of hydraulic pressure to the first linkage pipeline and / or the second linkage pipeline through the driving of the driving unit; A connecting point is provided between the second linkage pipeline and the first wheel end brake pipeline, the second linkage solenoid valve is arranged between the pressure building cylinder and the connecting point, and the first one-way valve is arranged between the oil pot module and the connecting point; The first oil chamber is communicated with the decoupling cylinder, the second oil chamber and the third oil chamber are communicated with the second brake chamber and the third brake chamber respectively, and the fourth oil chamber is communicated with the second linkage pipeline, the oil replenishment pipeline, the pressure-building oil return pipeline, and the wheel-end oil return pipeline; When the pedal is decoupled from the brake master cylinder and the first linkage solenoid valve is opened and the second linkage solenoid valve is closed, the drive unit can control the piston in the pressure-building cylinder to move horizontally to output hydraulic pressure to the first brake chamber, thereby pushing the first brake piston and the second brake piston, so that the oil in the second brake chamber and the third brake chamber are respectively output to the wheel brake unit through the first wheel-end brake pipeline and the second wheel-end brake pipeline; When the pedal is decoupled from the brake master cylinder and the second linkage solenoid valve is opened and the first linkage solenoid valve is closed, the drive unit can control the piston in the pressure building cylinder to move horizontally to output hydraulic pressure to the first wheel end brake line. Part of the oil entering the first wheel end brake line is output to the wheel brake unit, and the other part is output to the second brake chamber. Under the action of the hydraulic pressure in the second brake chamber, the second brake piston moves horizontally to the side away from the first brake piston, thereby outputting the oil in the third brake chamber to the wheel brake unit through the second wheel end brake line.

2. An electronic hydraulic brake system according to claim 1, characterized in that: The wheel brake unit comprises a first wheel group and a second wheel group, the first wheel group is connected to the brake master cylinder via a first wheel end brake pipeline, and the second wheel group is connected to the brake master cylinder via a second wheel end brake pipeline; The first wheel group and the second wheel group each include at least one wheel cylinder assembly, and the wheel cylinder assembly is equipped with a boost valve and a pressure reducing valve; Among them, the boost valves of the first wheel group and the second wheel group are connected to the first wheel end brake pipeline and the second wheel end brake pipeline respectively, and the pressure reducing valves of the first wheel group and the second wheel group are connected to the oil tank module through the wheel end oil return pipeline.

3. The electronic hydraulic brake system according to claim 1, characterized in that: It also includes a displacement sensor for monitoring the pedal stroke of the pedal, and / or it also includes a first pressure sensor for monitoring the hydraulic pressure of the decoupling cylinder; Wherein, the first pressure sensor is connected to the hydraulic pressure output end of the decoupling cylinder and is connected in parallel with the decoupling solenoid valve.

4. An electronic hydraulic brake system according to claim 3, characterized in that: It also includes a second pressure sensor for monitoring the output fluid pressure of the pressure-building cylinder.

5. The electronic hydraulic brake system according to claim 1, characterized in that: Also included is a pedaling feeling simulation unit connected to the decoupling cylinder fluid pressure output terminal; The pedaling feeling simulation unit is connected in parallel with the decoupling electromagnetic valve, and comprises a pedaling feeling simulator and a simulation electromagnetic valve arranged between the pedaling feeling simulator and the decoupling cylinder.

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