Electronic hydraulic braking system

Abstract

The invention discloses an electronic hydraulic brake system which comprises a pedal, an oil can module, a brake master cylinder, a pressure buildup unit and a wheel brake unit, two brake pistons are arranged in the brake master cylinder in a sliding mode, and the two brake pistons divide the interior of the brake master cylinder into three brake cavities. Three brake cavities are formed in the brake master cylinder, brake control over the wheel brake unit can be achieved through cooperation of the pressure buildup unit and the first linkage electromagnetic valve or the second linkage electromagnetic valve in the decoupled state of the pedal and the brake master cylinder, and meanwhile a pressure buildup cylinder of the pressure buildup unit can communicate with the brake master cylinder and the wheel brake unit. And when the brake master cylinder and the wheel brake unit leak oil and fail, oil can be supplemented, so that oil leakage fault repair of the brake system is realized, and the safety redundancy capability of the brake system is further improved.

Description

Technical Field

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

[0002] The electronic hydraulic brake system is developed from the traditional hydraulic brake system. It replaces the vacuum booster with a motor and 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 a CSV (solenoid valve) to achieve decoupling of the braking force from the pedal force. The PSU (Pressure Supply Unit) directly pressurizes the brakes through dual hydraulic pipelines to establish braking force. The wheel-end hydraulic circuit generates pressure through the return of the PSU piston to suck in brake fluid, thereby achieving circuit fluid replenishment.

[0004] Among the above-mentioned existing technologies, most of them adopt a wire-controlled hydraulic braking solution based on a dual-chamber master cylinder configuration. Due to the limitation of the number of cavities in the master cylinder, when the braking system performs failure backup, the control form of the oil circuit is relatively simple. When part of the failure backup oil circuit fails, it is difficult to ensure the braking effectiveness, and the overall fault resistance redundancy capability is poor. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an electronic hydraulic brake system with flexible control and large safety redundancy.

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

[0007] The present application provides an electronic hydraulic brake system, including 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 second wheel end brake pipeline through a second linkage solenoid valve; The pressure-building cylinder can realize the transmission of hydraulic pressure to the first linkage pipeline and / or the second linkage pipeline through the drive of the drive unit.

[0008] It is further defined that in the above-mentioned electronic hydraulic brake system, 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; Among them, 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 tank module and the connecting point.

[0009] It is further defined that in the above-mentioned electronic hydraulic brake system, 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; Wherein, the connection direction of the second one-way valve is from the oil tank module to one side of the wheel brake unit.

[0010] It is further defined that, in the above-mentioned electronic hydraulic brake system, a pressure-building oil return pipeline is provided between the oil tank module and the pressure-building cylinder.

[0011] It is further defined that in the above-mentioned electronic hydraulic brake system, the wheel brake 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 brake pipeline, and the second wheel group is connected to the brake master cylinder through 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.

[0012] 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; Wherein, the oil pot module is connected to the decoupling cylinder and can provide oil to the decoupling cylinder.

[0013] 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; 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.

[0014] 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.

[0015] It is further defined that 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; Wherein, the first oil chamber is connected to the decoupling cylinder; And / or, the second oil chamber and the third oil chamber are communicated with the second brake chamber and the third brake chamber respectively; 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.

[0016] It is further defined that the above-mentioned electronic hydraulic brake system further includes a pedal 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.

[0017] The present invention has at least the following beneficial effects: 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; 2. A decoupling cylinder is arranged between the pedal and the brake master cylinder, so that the pedal indirectly controls the hydraulic pressure delivered by the brake master cylinder to the wheel brake unit through the decoupling cylinder. At this time, the pedal stroke is not limited by the structure of the brake master cylinder. The decoupling cylinder can provide a larger pedal adjustment range for the pedal, thereby further improving the comfort of the electronic hydraulic brake system; 3. Since the second brake chamber and the third brake chamber are respectively connected to the independent second oil chamber and the third oil chamber in the oil tank module, when the hydraulic oil leaks in the brake master cylinder, the hydraulic oil in the first oil chamber and the fourth oil chamber will not leak synchronously, thereby ensuring the working stability of the decoupling cylinder, the pressure building unit and the wheel brake unit, and improving the redundancy capacity of the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the electronic hydraulic brake system according to an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the electronic hydraulic brake system according to an embodiment of the present application; Figure 3 This is a structural schematic diagram of the "brake master cylinder 500" part of the electronic hydraulic brake system of the embodiment of the present application; Figure 4 This is a structural schematic diagram of the "oil tank module 400" part of the electronic hydraulic brake system in the embodiment of the present application; Figure 5 This is a schematic diagram of the structure of the "pressure building unit 600" in the electronic hydraulic brake system of the embodiment of the present application; Figure 6 This is a structural schematic diagram of the "pedaling simulation unit 800" in the electronic hydraulic brake system of the embodiment of the present application; Figure 7 It is a schematic diagram of the structure of the "wheel brake unit 700" part in the electronic hydraulic brake system of an embodiment of the present application.

[0019] Reference numerals

[0020] 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 return oil pipeline-630, first linkage pipeline-660, second linkage pipeline-670, oil replenishment pipeline-680 , wheel brake unit-700, first wheel cylinder assembly-710, first boosting valve-711, first pressure reducing valve-712, second wheel cylinder assembly-720, second boosting valve-721, second pressure reducing valve-722, third wheel cylinder assembly-730, third boosting valve-731, third pressure reducing valve-732, fourth wheel cylinder assembly-740, fourth boosting 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 feel simulation unit-800, pedal feel 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 DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0022] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, 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 represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0023] The electronic hydraulic brake system provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0024] Example 1 like Figures 1 to 7 As shown, an embodiment of the present application provides an electronic hydraulic brake system, including a pedal 100, an oil tank module 400, a brake master cylinder 500, a pressure building unit 600 and a wheel brake unit 700.

[0025] The pedal 100 is coupled to the brake master cylinder 500, and a first brake piston 510 and a second brake piston 520 are slidingly arranged in the brake master cylinder 500, and the first brake piston 510 and the second brake piston 520 divide the brake master cylinder 500 into a first brake chamber 530, a second brake chamber 540, and a third brake chamber 550.

[0026] The first brake chamber 530 is located on a 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 , and the third brake chamber 550 is located on a side of the second brake piston 520 away from the first brake piston 510 .

[0027] The wheel brake 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 wheel end brake pipeline 750, and the hydraulic pressure input end of the second wheel group is connected to the third brake chamber 550 through a second wheel end brake pipeline 760.

[0028] 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 to a first linkage pipeline 660 and a second linkage pipeline 670 which are connected in parallel. The first linkage pipeline 660 is connected to the first brake chamber 530 through a first linkage solenoid valve 950, and the second linkage pipeline 670 is connected to the second wheel end brake pipeline 760 through a second linkage solenoid valve 960.

[0029] The oil tank module 400 is connected to the master cylinder 500 , the pressure building unit 600 , and the wheel brake unit 700 , respectively, and is used to provide oil to the master cylinder 500 , the pressure building unit 600 , and the wheel brake unit 700 .

[0030] The pressure building cylinder 620 can realize the transmission of hydraulic pressure to the first linkage pipeline 660 and / or the second linkage pipeline 670 through the driving of the driving unit.

[0031] 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, when the operator steps on the pedal 100, the hydraulic pressure can be delivered to the brake master cylinder 500 through the displacement of the pedal 100, and the brake master cylinder 500 can realize the brake pressure buildup of the wheel brake unit 700 under the control of the pedal 100; When the pedal 100 is decoupled from the brake master cylinder 500, the pressure building unit 600 can perform braking control on the wheel brake unit 700, specifically including: 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 horizontally 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 oil in the second brake chamber 540 and the third brake chamber 550 is respectively output to the first wheel group and the second wheel group of the wheel brake unit 700 through the first wheel end brake pipeline 750 and the second wheel end brake pipeline 760, thereby realizing the braking control of the wheel brake unit 700; 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 horizontally to output hydraulic pressure to the first wheel end brake line 750. A part of the oil entering the first wheel end brake line 750 is output to the first wheel group of the wheel brake unit 700, and the other part is output to the second brake chamber 540. The second brake piston 520 moves horizontally to the side away from the first brake piston 510 under the action of the hydraulic pressure of the second brake chamber 540, so that the oil in the third brake chamber 550 is output to the second wheel group of the wheel brake unit 700 through the second wheel end brake line 760, thereby realizing braking control of the wheel brake unit 700.

[0032] In an embodiment of the present application, an electronic hydraulic braking system as described above is adopted, and three brake chambers are arranged in the brake master cylinder 500. When the pedal 100 and the brake master cylinder 500 are decoupled, the braking control of the wheel brake unit 700 can be achieved through the cooperation of the pressure building unit 600 and the first linkage solenoid valve 950 or the second linkage solenoid valve 960. At the same time, the pressure building cylinder 620 of the pressure building unit 600 can be connected with the brake master cylinder 500 and the wheel brake unit 700. When the brake master cylinder 500 and the wheel brake unit 700 fail due to oil leakage, they can be replenished with oil, thereby realizing the oil leakage fault repair of the braking system and further improving the safety redundancy capability of the braking system.

[0033] It can be understood that the connection form between the brake master cylinder 500 and the wheel brake unit 700 is not limited to the above-mentioned one. For example, the first wheel end brake line 750 of the first wheel group can be set to be connected to the third brake chamber 550, and the second wheel end brake line 760 of the second wheel group can be connected to the second brake chamber 540. As long as the brake master cylinder 500 can realize the hydraulic pressure transmission to the two wheel groups of the wheel brake unit 700, it will not be elaborated here.

[0034] In a preferred embodiment, Figure 1 , Figure 2 , Figure 5As shown, the driving unit is specifically configured as a motor 610 connected to a pressure-building cylinder 620 , and the pressure-building cylinder 620 can realize the transmission of hydraulic pressure to the wheel brake unit 700 through the drive of the motor 610 .

[0035] It is understandable 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 gear rack structure, etc., as long as it can realize the hydraulic pressure output drive of the pressure building cylinder 620, which will not be elaborated here.

[0036] In a preferred embodiment, Figure 1 , Figure 2 , Figure 7 As shown, a pressure-building oil return pipeline 630 is provided between the oil tank module 400 and the pressure-building unit 600 .

[0037] The pressure-building oil return pipeline 630 is connected to 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 .

[0038] In a preferred embodiment, Figure 1 , Figure 2 As shown, the second linkage pipeline 670 is connected to the oil pot module 400 at one end away from the pressure building cylinder 620, and a first one-way valve 970 is provided on the second linkage pipeline 670. The connection direction of the first one-way valve 970 is from the oil pot module 400 to one side of the pressure building cylinder 620.

[0039] Among them, a connecting point is provided between the second linkage pipeline 670 and the first wheel end brake pipeline 750, the second linkage solenoid valve 960 is arranged between the pressure building cylinder 620 and the connecting point, and the first one-way valve 970 is arranged between the oil tank module 400 and the connecting point.

[0040] It is understandable that when the pressure building cylinder 620 builds up negative pressure, the first one-way valve 970 on the second linkage pipeline 670 is turned on, and the oil tank module 400 can replenish oil to the pressure building cylinder 620 and the brake master cylinder 500 through the second linkage pipeline 670 .

[0041] In a preferred embodiment, Figure 1 , Figure 2 As shown, an oil replenishment pipeline 680 is provided between the oil tank module 400 and the second wheel end brake pipeline 760 , and a second one-way valve 980 is provided on the oil replenishment pipeline 680 .

[0042] The connection direction of the second one-way valve 980 is from the oil tank module 400 to the wheel brake unit 700 .

[0043] It is understandable that when negative pressure is established in the brake master cylinder 500 , the second one-way valve 980 on the oil replenishing line 680 is turned on, and the oil tank module 400 can replenish oil to the brake master cylinder 500 through the oil replenishing line 680 and the second wheel end brake line 760 .

[0044] In a preferred embodiment, Figure 1 , Figure 2 , Figure 7 As shown, the first wheel group 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 pressure-increasing valve 711 and a first pressure-reducing valve 712 , and the second wheel cylinder assembly 720 is equipped with a second pressure-increasing valve 721 and a second pressure-reducing valve 722 .

[0045] The first pressure-boosting valve 711 and the second pressure-boosting valve 721 are respectively communicated with the first wheel-end brake pipeline 750 .

[0046] In a preferred embodiment, Figure 1 , Figure 2 , Figure 7 As shown, the second wheel group 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 boost valve 731 and a third pressure reducing valve 732 . The fourth wheel cylinder assembly 740 is equipped with a fourth boost valve 741 and a fourth pressure reducing valve 742 .

[0047] The third boost valve 731 and the fourth boost valve 741 are respectively connected to the second wheel-end brake pipeline 760 .

[0048] It can be understood that the structural forms of the first wheel group and the second wheel group are not limited to the above one. Specifically, the first wheel group and the second wheel group correspond to the front and rear wheels of the vehicle respectively, and include at least one wheel cylinder assembly.

[0049] In a preferred embodiment, Figure 1 , Figure 2 , Figure 7 As shown, a wheel end oil return pipeline 770 is provided between the oil tank module 400 and the wheel brake unit 700 .

[0050] 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 .

[0051] It can be understood that when the wheel brake unit 700 performs braking, the brake master cylinder 500 or the pressure building unit 600 can deliver hydraulic pressure to the first wheel group and the second wheel group through the first wheel end brake pipeline 750 and the second wheel end brake pipeline 760, the first boosting valve 711, the second boosting valve 721, the third boosting valve 731, and the fourth boosting 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, thereby realizing 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. Pressure-maintaining braking; when the wheel brake unit 700 is released, the first pressure-boosting valve 711, the second pressure-boosting valve 721, the third pressure-boosting valve 731, and the fourth pressure-boosting 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, 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 return oil to the oil pot module 400 through the wheel-end oil return pipeline 770, thereby achieving 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.

[0052] In a preferred embodiment, Figure 1 , Figure 2 As shown, it also includes a decoupling cylinder 300 connected to the pedal 100, the first brake chamber 530 of the brake master cylinder 500 is connected to the decoupling cylinder 300 through a decoupling solenoid valve 310, and the oil tank module 400 is connected to the decoupling cylinder 300 and can provide oil to the decoupling cylinder 300.

[0053] Among them, when the decoupling solenoid valve 310 is in the open state, the decoupling cylinder 300 can realize the transmission of hydraulic pressure to the brake master cylinder 500 through the displacement of the pedal 100, and the brake master cylinder 500 can realize the brake pressure buildup of the wheel brake unit 700 under the action of the hydraulic pressure transmitted by the decoupling cylinder 300.

[0054] 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 horizontally. The oil in the decoupling cylinder 300 can be delivered to the brake master cylinder 500 through the decoupling solenoid valve 310. When the decoupling cylinder 300 delivers hydraulic pressure to the first brake chamber 530, the first brake piston 510 moves toward the side close to the second brake piston 520, and the pressure in the second brake chamber 540 and the third brake chamber 550 rises, thereby driving the hydraulic oil to be delivered to the first wheel group and the second wheel group through the first wheel end brake pipeline 750 and the second wheel end brake pipeline 760, thereby realizing the braking pressure building of the wheel brake unit 700.

[0055] In an embodiment of the present application, an electronic hydraulic brake system as described above is adopted, and a decoupling cylinder 300 is arranged between the pedal 100 and the brake master cylinder 500, so that the pedal 100 indirectly controls the hydraulic pressure delivery of the brake master cylinder 500 to the wheel brake unit 700 through the decoupling cylinder 300. At this time, the pedaling stroke of the pedal 100 is not limited by the structure of the brake master cylinder 500. The decoupling cylinder 300 can provide the pedal 100 with a larger pedaling adjustment range, thereby further improving the use comfort of the electronic hydraulic brake system.

[0056] In a preferred embodiment, Figure 1 , Figure 2 As shown, a decoupling pipeline 330 is provided between the hydraulic pressure output end of the decoupling cylinder 300 and the brake master cylinder 500 , and the decoupling solenoid valve 310 is arranged on the decoupling pipeline 330 .

[0057] In a preferred embodiment, Figure 1 , Figure 2 As shown, a displacement sensor 210 for monitoring the pedaling stroke of the pedal 100 is also included.

[0058] In a preferred embodiment, Figure 1 , Figure 2 As shown, a first pressure sensor 220 for monitoring the hydraulic pressure of the decoupling cylinder 300 is also included.

[0059] It can be understood that there is a positive proportional relationship between the pedal stroke of the pedal 100 and the output hydraulic pressure of the decoupling cylinder 300. By monitoring the pedal stroke of the pedal 100 and the output hydraulic pressure of the decoupling cylinder 300, the control accuracy of the pedal stroke of the pedal 100 on the braking degree of the wheel brake unit 700 can be improved, thereby ensuring the control reliability of the hydraulic braking system.

[0060] In a preferred embodiment, Figure 1 , Figure 2 As 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 .

[0061] In a preferred embodiment, the pressure building unit 600 is coupled to the pedal 100 .

[0062] It can be understood that the pressure building unit 600 can obtain the output result of the displacement sensor 210 (i.e., the pedaling 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 pedal 100 to output a corresponding amount of hydraulic pressure, thereby ensuring the braking force control accuracy of the wheel brake unit 700.

[0063] In a preferred embodiment, Figure 1 , Figure 2 As shown, a second pressure sensor 230 for monitoring the output hydraulic pressure of the pressure-building cylinder 620 is also included.

[0064] It can be understood that the output hydraulic pressure of the pressure building cylinder 620 can be monitored through the second pressure sensor 230, and by coordinating with the monitoring results 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 braking degree of the wheel brake unit 700 by the pedal stroke of the pedal 100 is guaranteed.

[0065] In a preferred embodiment, Figure 1 , Figure 2 As shown, the second pressure sensor 230 is connected to the hydraulic pressure output end of the pressure building cylinder 620 , and is connected in parallel with the first linkage pipeline 660 and the second linkage pipeline 670 .

[0066] In a preferred embodiment, Figure 1 , Figure 2 , Figure 4 As shown, a plurality of independent oil chambers are provided in the oil pot module 400 , wherein one independent oil chamber is communicated with the oil inlet end of the decoupling cylinder 300 and is used for supplying hydraulic oil to the decoupling cylinder 300 .

[0067] In a preferred embodiment, Figure 1 , Figure 2 , Figure 4 As shown, a plurality of independent oil chambers are provided in the oil tank module 400 , and one of the independent oil chambers 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 .

[0068] In a preferred embodiment, Figure 1 , Figure 2 , Figure 4 As shown, a first oil chamber 410 , a second oil chamber 420 , a third oil chamber 430 , and a fourth oil chamber 440 are provided in the oil pot module 400 .

[0069] 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 replenishing pipeline 680, the pressure building 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.

[0070] In an embodiment of the present application, an electronic hydraulic braking system as described above is adopted. Since the second brake chamber 540 and the third brake chamber 550 are respectively connected to the independent second oil chamber 420 and the third oil chamber 430 in the oil pot module 400, when the hydraulic oil leaks 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 brake unit 700, and improving the redundancy capability of the braking system.

[0071] In a preferred embodiment, Figure 1 , Figure 2 As shown, it also includes a pedal feeling simulation unit 800 connected to the hydraulic pressure output end of the decoupling cylinder 300.

[0072] In a preferred embodiment, Figure 1 , Figure 2 , Figure 6 As shown, the pedaling feeling simulation unit 800 is connected in parallel with the decoupling solenoid valve 310 , and includes a pedaling feeling simulator 810 and a simulation solenoid valve 820 disposed between the pedaling feeling simulator 810 and the decoupling cylinder 300 .

[0073] 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 user's pedaling braking damping on the pedal 100 and optimizing the braking system's feedback to the user.

[0074] In a preferred embodiment, Figure 1 , Figure 2 , Figure 6 As shown, a simulation pipeline 320 connected in parallel with the decoupling pipeline 330 is provided between the pedal feel simulator 810 and the decoupling cylinder 300 , and a simulation solenoid valve 820 is provided on the simulation pipeline 320 .

[0075] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment 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 reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0076] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection 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 second wheel end brake pipeline through a second linkage solenoid valve; The pressure-building cylinder can realize the transmission of hydraulic pressure to the first linkage pipeline and / or the second linkage pipeline through the drive of the drive unit.

2. An electronic hydraulic brake system according to claim 1, characterized in that: 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; Among them, 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 tank module and the connecting point.

3. An electronic hydraulic brake system according to claim 1 or 2, characterized in that: An oil replenishment pipeline is connected 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; Wherein, the connection direction of the second one-way valve is from the oil tank module to one side of the wheel brake unit.

4. The electronic hydraulic brake system according to claim 1, characterized in that: A pressure-building oil return pipeline is provided between the oil pot module and the pressure-building cylinder.

5. The 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.

6. The electronic hydraulic brake system according to claim 1, characterized in that: 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, and a decoupling solenoid valve is provided on the decoupling pipeline; Wherein, the oil pot module is connected to the decoupling cylinder and can provide oil to the decoupling cylinder.

7. An electronic hydraulic brake system according to claim 6, 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.

8. An electronic hydraulic brake system according to claim 7, characterized in that: It also includes a second pressure sensor for monitoring the output fluid pressure of the pressure-building cylinder.

9. An electronic hydraulic brake system according to any one of claims 4 to 8, characterized in that: 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 first oil chamber is connected to the decoupling cylinder; And / or, the second oil chamber and the third oil chamber are communicated with the second brake chamber and the third brake chamber respectively; 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.

10. 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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