Hydraulically decoupled electro-hydraulic brake system

Abstract

A hydraulically decoupled electro-hydraulic brake system, relating to the technical field of automobile brake systems. The brake system comprises a main brake circuit, a redundant brake circuit and a mechanical brake circuit which are connected to a reservoir module and a wheel-end module; the main brake circuit comprises a first pressure-building module connected to the reservoir module and the wheel-end module; the mechanical brake circuit comprises a mechanical pressure-building module connected to the reservoir module and the wheel-end module; and when at least a portion of the first pressure-building module or the mechanical pressure-building module fails or hydraulic pressure generated is insufficient, vehicle braking requirements can be met by means of cooperation with the redundant brake circuit. When at least a portion of the first pressure-building module and the mechanical pressure-building module fails, the redundant brake circuit can generate hydraulic pressure to meet the vehicle braking requirements. At least two of the main brake circuit, the redundant brake circuit and the mechanical brake circuit can cooperate with each other to solve the problem of elevated hydraulic pressure required by the wheel-end module, thereby meeting the vehicle braking requirements.

Description

Hydraulic decoupling type electronic hydraulic brake system

[0001] Cross-reference to related applications

[0002] The present application refers to the Chinese Patent Application No. 202410732959.8 entitled "Hydraulic decoupling type electronic hydraulic brake system" filed on June 07, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of automobile brake systems, in particular to a hydraulic decoupling type electronic hydraulic brake system. BACKGROUND

[0004] With the gradual improvement of the performance level and maturity of intelligent driving systems, in order to meet the needs of L3 level redundancy braking, i.e. the vehicle must have backup capability of line control braking, the existing brake system can only realize mechanical brake backup capability, and cannot meet the needs of high-level automatic driving. The current redundancy scheme is IPB+RBU scheme, i.e. on the basis of the existing onebox, a new RBU (equivalent to a pressure building unit) is added to backup pressure building.

[0005] The inventor found that the related art at least has the following problems: the addition of an RBU (pressure building unit) is costly and the improvement of redundancy capability is limited, and it is difficult for the mainstream market to accept redundancy through the addition of a pressure building unit.

[0006] SUMMARY

[0007] The embodiment of the application provides a hydraulic decoupling type electronic hydraulic brake system, the system comprises: a main brake circuit, a redundant brake circuit and a mechanical brake circuit connected with an oil can module and a wheel end module respectively; the main brake circuit comprises a first pressure building module connected with the oil can module and the wheel end module; the mechanical brake circuit comprises a mechanical pressure building module connected with the oil can module and the wheel end module; the oil can module comprises at least a first oil storage cavity, a second oil storage cavity and a third oil storage cavity; the main brake circuit is connected with the first oil storage cavity; the redundant brake circuit comprises a second pressure building module connected with the second oil storage cavity and the third oil storage cavity; the redundant brake circuit and the mechanical brake circuit are connected with the second oil storage cavity and the third oil storage cavity respectively; the first pressure building module comprises a pressure building cavity, a first electromagnetic valve and a second electromagnetic valve; the wheel end module comprises a first wheel group and a second wheel group, and the first wheel group and the second wheel group each comprise at least one wheel; the pressure building cavity is connected with the first wheel group through the first electromagnetic valve and connected with the second wheel group through the second electromagnetic valve; the redundant brake circuit further comprises a first line and a second line; one end of the first line is connected with the second oil storage cavity, and the other end is connected between the first electromagnetic valve and the first wheel group; one end of the second line is connected with the third oil storage cavity, and the other end is connected between the second electromagnetic valve and the second wheel group; one end of the second pressure building module is connected between the first electromagnetic valve and the first wheel group, and the other end is connected between the second electromagnetic valve and the second wheel group.

[0008] The pedal feeling module is further included, one end of the pedal feeling module is connected with the second oil storage cavity and / or the third oil storage cavity, and the other end is connected between the first pressure building module and the first oil storage cavity.

[0009] The first pressure sensor is arranged between the first line and the second pressure building module, and the second pressure sensor is arranged between the second line and the second pressure building module.

[0010] The pedal feeling module comprises an analog cavity, and a sealing ring is arranged at the analog cavity.

[0011] The mechanical brake circuit comprises a first brake cylinder connected with the second oil storage cavity and a second brake cylinder connected with the third oil storage cavity; the first brake cylinder is further connected to between the first electromagnetic valve and the first wheel group through a third electromagnetic valve, and the second brake cylinder is further connected to between the second electromagnetic valve and the second wheel group through a fourth electromagnetic valve. BRIEF DESCRIPTION OF DRAWINGS

[0012] One or more embodiments are illustrated by way of example in the drawings and are described herein in connection with the embodiments described, but the embodiments described are not intended to be limiting of the disclosure and that the scope of the disclosure includes other embodiments and is only limited by the claims.

[0013] Fig. 1 is a schematic diagram of a hydraulic decoupling type electronic hydraulic brake system according to an embodiment of the present application;

[0014] Fig. 2 is a schematic diagram of a hydraulic decoupling type electronic hydraulic brake system according to an embodiment of the present application, in which a first pressure sensor is arranged between a first circuit and a second pressure building module, and a second pressure sensor is arranged between a second circuit and the second pressure building module;

[0015] Fig. 3 is a schematic diagram of a hydraulic decoupling type electronic hydraulic brake system according to an embodiment of the present application, in which when the vehicle adopts a main brake circuit, a third solenoid valve, a fourth solenoid valve, an eighth solenoid valve and a ninth solenoid valve are kept in a closed state, and a first solenoid valve, a second solenoid valve and a fifth solenoid valve are kept in a conductive state;

[0016] Fig. 4 is a schematic diagram of a hydraulic decoupling type electronic hydraulic brake system according to an embodiment of the present application, in which when the vehicle adopts a mechanical brake circuit, a first solenoid valve, a second solenoid valve, a fifth solenoid valve, an eighth solenoid valve and a ninth solenoid valve are kept in a closed state, and a third solenoid valve and a fourth solenoid valve are kept in a conductive state;

[0017] Fig. 5 is a schematic diagram of a hydraulic decoupling type electronic hydraulic brake system according to an embodiment of the present application, in which when the vehicle adopts a redundant brake circuit, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a sixth solenoid valve and a seventh solenoid valve are kept in a closed state, and a fifth solenoid valve, an eighth solenoid valve and a ninth solenoid valve are kept in a conductive state.

[0018] Reference signs

[0019] 10, first pipeline; 11, first circuit; 12, first check valve; 20, second pipeline; 21, second circuit; 22, second check valve; 30, third pipeline; 40, fourth pipeline; 50, foot pedal; 110, first oil storage cavity; 120, second oil storage cavity; 130, third oil storage cavity; 210, wheel; 211, pressure increasing valve; 212, pressure reducing valve; 310, pressure building cavity; 311, first solenoid valve; 312, second solenoid valve; 410, redundant motor; 420, pump body; 510, first brake cylinder; 520, second brake cylinder; 530, third solenoid valve; 540, fourth solenoid valve; 610, simulation cavity; 620, fifth solenoid valve; 710, sixth solenoid valve; 720, seventh solenoid valve; 730, eighth solenoid valve; 740, ninth solenoid valve; 810, first pressure sensor; 820, second pressure sensor; 910, filter screen. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical solutions and advantages of the present application clearer, some embodiments of the present application are further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0021] Some embodiments of the present application relate to a hydraulic decoupling type electronic hydraulic brake system, as shown in FIG. 1, which can be applied to a vehicle to meet the braking needs of the vehicle, comprising an oil tank module, a wheel end module, a main brake circuit, a redundant brake circuit and a mechanical brake circuit, wherein the main brake circuit, the redundant brake circuit and the mechanical brake circuit are respectively connected with the oil tank module and the wheel end module, the oil tank module can provide oil for the main brake circuit, the redundant brake circuit and the mechanical brake circuit, when the vehicle generates a braking request, the main brake circuit, the redundant brake circuit and the mechanical brake circuit can all generate hydraulic pressure using the oil provided by the oil tank module and transmit it to the wheel end module, thereby achieving the braking of the vehicle.

[0022] In some embodiments, the main brake circuit comprises a first pressure building module, the first pressure building module is respectively connected with the oil tank module and the wheel end module, when the vehicle generates a braking request, the first pressure building module can generate hydraulic pressure using the oil provided by the oil tank module and transmit it to the wheel end module to achieve the braking of the vehicle; the mechanical brake circuit comprises a mechanical pressure building module, the mechanical pressure building module is respectively connected with the oil tank module and the wheel end module, when the vehicle generates a braking request, the mechanical pressure building module can generate hydraulic pressure using the oil provided by the oil tank module and transmit it to the wheel end module to achieve the braking of the vehicle.

[0023] It can be understood that during the driving of the vehicle, when the vehicle generates a braking request, the main brake circuit, the redundant brake circuit and the mechanical brake circuit can all generate hydraulic pressure using the oil provided by the oil tank module and transmit it to the wheel end module, that is, the main brake circuit, the redundant brake circuit and the mechanical brake circuit can all meet the braking needs of the vehicle independently; therefore, when at least part of the first pressure building module and the mechanical pressure building module fails, the redundant brake circuit can still maintain complete functions, so that the redundant brake circuit can generate hydraulic pressure using the oil provided by the oil tank module and transmit it to the wheel end module to meet the braking needs of the vehicle.

[0024] In some embodiments, at least part of the failure of the first pressure building module and the mechanical pressure building module can be understood as at least part of the function of the first pressure building module fails or at least part of the function of the mechanical pressure building module fails or at least one of the first pressure building module and the mechanical pressure building module completely fails.

[0025] In some embodiments, at least two of the main brake circuit, the redundant brake circuit and the mechanical brake circuit can cooperate with each other when the vehicle generates a braking request, solve the problem of high hydraulic pressure required by the wheel end module through synchronous pressure building, and meet the braking demand of the vehicle.

[0026] It can be understood that when the hydraulic pressure generated by the main brake circuit or the mechanical brake circuit or the main brake circuit plus the mechanical brake circuit is insufficient, that is, the hydraulic pressure generated by the first pressure building module or the mechanical pressure building module or the first pressure building module plus the mechanical pressure building module is insufficient, the redundant brake circuit can be enabled to generate hydraulic pressure through the assistance of the redundant brake circuit to generate sufficient hydraulic pressure and transmit it to the wheel end module to meet the braking demand of the vehicle. Of course, in combination with the above, the insufficient hydraulic pressure generated by the main brake circuit or the mechanical brake circuit or the main brake circuit plus the mechanical brake circuit includes that all the functions of the first pressure building module and the mechanical pressure building module are normal, and at least part of the first pressure building module and the mechanical pressure building module fails.

[0027] In some embodiments, the oil can module includes at least three independent oil storage cavities, including but not limited to a first oil storage cavity 110, a second oil storage cavity 120 and a third oil storage cavity 130. Among them, the first pressure building module of the main brake circuit is connected with the first oil storage cavity 110; the redundant brake circuit is connected with at least one of the second oil storage cavity 120 and the third oil storage cavity 130; the mechanical pressure building module of the mechanical brake circuit is connected with at least one of the second oil storage cavity 120 and the third oil storage cavity 130.

[0028] It can be understood that the connection of the main brake circuit with the oil can module is different from that of the redundant brake circuit and the mechanical brake circuit. When the vehicle generates a braking request, the first pressure building module of the main brake circuit can generate hydraulic pressure by using the oil provided by the first oil storage cavity 110 and transmit it to the wheel end module, the redundant brake circuit can generate hydraulic pressure by using the oil provided by the second oil storage cavity 120 and / or the third oil storage cavity 130 connected thereto and transmit it to the wheel end module, and the mechanical pressure building module of the mechanical brake circuit can generate hydraulic pressure by using the oil provided by the second oil storage cavity 120 and the third oil storage cavity 130 connected thereto and transmit it to the wheel end module.

[0029] It should be noted that during the driving of the vehicle, the first pressure building module in the main brake circuit may fail due to oil leakage. In this case, since the first pressure building module is only connected with the first oil storage cavity 110, the failure of the first pressure building module will only cause the oil in the first oil storage cavity 110 to leak, and will not affect the second oil storage cavity 120 and the third oil storage cavity 130, so that the second oil storage cavity 120 and the third oil storage cavity 130 still have sufficient oil.

[0030] For example, when the first pressure building module fails, the braking demand of the vehicle can be met by the redundant braking circuit. When the first pressure building module fails and causes oil leakage in the first oil storage cavity 110, the second oil storage cavity 120 and / or the third oil storage cavity 130 connected with the redundant braking circuit can provide sufficient oil for the redundant braking circuit, so that the redundant braking circuit can generate sufficient hydraulic pressure, thereby meeting the braking demand of the vehicle. Similarly, since the second oil storage cavity 120 and the third oil storage cavity 130 have sufficient oil, the braking demand of the vehicle can also be met by the mechanical braking circuit, which will not be described here. When the second oil storage cavity 120 and / or the third oil storage cavity 130 causes oil leakage, the first oil storage cavity 110 will not be affected, so that the first oil storage cavity 110 can have sufficient oil, thereby enabling the main braking circuit to meet the braking demand of the vehicle.

[0031] In some embodiments, the hydraulic decoupling type electronic hydraulic brake system of the present application further comprises a foot pedal 50 and a pedal feeling module. The foot pedal 50 is directly connected to the mechanical pressure building module, and the driver steps on the foot pedal 50 to realize that the mechanical pressure building module generates hydraulic pressure by the oil can module and provides it to the wheel end module. One end of the pedal feeling module is connected to at least one of the second oil storage cavity 120 and the third oil storage cavity 130, and the other end of the pedal feeling module is connected between the first pressure building module and the first oil storage cavity 110. The pedal feeling module is mainly used when the vehicle generates hydraulic pressure by the main brake module or the redundant brake module to brake the vehicle. The pedal feeling module is used to provide a force feedback to the driver when the driver steps on the foot pedal 50, to simulate the foot feeling when hydraulic pressure is generated by the mechanical pressure building module, thereby improving the driving experience and comfort of the driver.

[0032] In some embodiments, since the pedal feeling module does not work when the vehicle's braking demand is realized by the mechanical braking circuit, the pedal feeling module comprises an analog cavity 610 and a fifth electromagnetic valve 620, which is arranged between the analog cavity 610 and the oil can module. When the mechanical braking circuit works, the fifth electromagnetic valve 620 is closed, and when the redundant braking circuit or the main braking circuit works, the fifth electromagnetic valve 620 is turned on.

[0033] It should be noted that when the vehicle's braking demand is realized by the main braking circuit or the redundant braking circuit, the driver steps on the foot pedal 50, at which time the second oil storage cavity 120 and / or the third oil storage cavity 130 connected with the pedal feeling module will provide oil for the pedal feeling module, so that the pedal feeling module can provide better foot feeling for the driver using the oil; when the pressure building of the first pressure building module ends and the pressure relief is performed, the oil in the pedal feeling module can enter between the other end of the pedal feeling module and the first pressure building module and the first oil storage cavity 110, thereby causing the oil in the pedal feeling module to flow back to the first oil storage cavity 110.

[0034] It should be noted that, since the pedal feeling module also needs oil, the pedal feeling module may also leak oil and fail during vehicle driving. At this time, the fifth electromagnetic valve 620 is closed, and the pedal feeling module only causes the first oil storage cavity 110 to leak, while the second oil storage cavity 120 and the third oil storage cavity 130 can have sufficient oil, so that when a braking request is generated, the vehicle can realize the braking demand of the vehicle through the redundant braking circuit and / or the mechanical braking circuit.

[0035] In some embodiments, the redundant braking circuit includes a second pressure building module, and the redundant braking circuit is connected to at least one of the second oil storage cavity 120 and the third oil storage cavity 130 through the second pressure building module. When the redundant braking circuit works, the second pressure building module of the redundant braking circuit generates hydraulic pressure using the oil provided by the oil canister module and transmits the hydraulic pressure to the wheel end module.

[0036] For example, when at least part of the first pressure building module and the mechanical pressure building module fails or the generated hydraulic pressure is insufficient, the second oil storage cavity 120 and / or the third oil storage cavity 130 connected to the second pressure building module can provide sufficient oil for the second pressure building module to provide sufficient hydraulic pressure for the wheel end module.

[0037] It should be noted that, since the first pressure building module is connected to the first oil storage cavity 110, when the first pressure building module partially fails or completely fails, the second pressure building module can be directly used to provide sufficient hydraulic pressure for the wheel end module. When the mechanical braking circuit and the redundant braking circuit are connected to different oil storage cavities, the second pressure building module can be directly used to provide sufficient hydraulic pressure for the wheel end module, but when the mechanical braking circuit and the redundant braking circuit are connected to the same oil storage cavity, the mechanical braking circuit needs to be closed to avoid oil leakage, so that the second pressure building module can obtain sufficient oil to generate hydraulic pressure.

[0038] In some embodiments, the first pressure building module includes a pressure building cavity 310, a first electromagnetic valve 311, and a second electromagnetic valve 312; the wheel end module includes a first wheel group and a second wheel group, and the first wheel group and the second wheel group each include at least one wheel 210. The first pressure building module is connected to the first oil storage cavity 110 through the pressure building cavity 310, the pressure building cavity 310 is connected to the first wheel group through the first electromagnetic valve 311, and the pressure building cavity 310 is connected to the second wheel group through the second electromagnetic valve 312.

[0039] For example, when the vehicle generates a braking request, the main braking circuit works, the first electromagnetic valve 311 and the second electromagnetic valve 312 are in the on state, the pressure building chamber 310 builds pressure by extracting oil in the first oil storage chamber 110 to generate hydraulic pressure, and then the pressure building chamber 310 transmits the generated hydraulic pressure to the first wheel set and the second wheel set through the first electromagnetic valve 311 and the second electromagnetic valve 312 respectively, thereby achieving the braking demand of the vehicle. When the redundant braking circuit or the mechanical braking circuit works, the first electromagnetic valve 311 and the second electromagnetic valve 312 are in the closed state to prevent oil in the redundant braking circuit or the mechanical braking circuit from entering the pressure building chamber 310.

[0040] In some embodiments, the redundant braking circuit not only includes the second pressure building module, but also includes the first line 11 and the second line 21. One end of the first line 11 is connected to the second oil storage chamber 120, and the other end of the first line 11 is connected between the first electromagnetic valve 311 and the first wheel set. One end of the second line 21 is connected to the third oil storage chamber 130, and the other end of the second line 21 is connected between the second electromagnetic valve 312 and the second wheel set. One end of the second pressure building module is connected between the first electromagnetic valve 311 and the first wheel set, and the other end of the second pressure building module is connected between the second electromagnetic valve 312 and the second wheel set.

[0041] For example, when the vehicle generates a braking request and the braking of the vehicle is realized through the redundant braking circuit, the mechanical braking circuit remains in the closed state, the first electromagnetic valve 311 and the second electromagnetic valve 312 are closed, and the pressure building chamber 310 is in a closed state with the first wheel set and the second wheel set. At this time, the second pressure building module can extract oil in the second oil storage chamber 120 and the third oil storage chamber 130 through the first line 11 and the second line 21, thereby generating hydraulic pressure by building pressure and transmitting the hydraulic pressure to the first wheel set and the second wheel set to meet the braking demand of the vehicle.

[0042] In some embodiments, the first one-way valve 12 and the second one-way valve 22 are respectively arranged on the first line 11 and the second line 21. When the main braking circuit or the mechanical braking circuit works, the oil can be prevented from flowing back to the oil canister module through the first line 11 or the second line 21 under the action of the first one-way valve 12 and the second one-way valve 22.

[0043] In some embodiments, the mechanical braking circuit includes the first brake cylinder 510 and the second brake cylinder 520. The first brake cylinder 510 is connected to the second oil storage chamber 120, and the second brake cylinder 520 is connected to the third oil storage chamber 130. Further, the first brake cylinder 510 is connected to the first electromagnetic valve 311 and the first wheel set through the third electromagnetic valve 530, and the second brake cylinder 520 is connected to the second electromagnetic valve 312 and the second wheel set through the fourth electromagnetic valve 540.

[0044] For example, when the vehicle generates a braking request and realizes vehicle braking through the mechanical braking circuit, the first electromagnetic valve 311 and the second electromagnetic valve 312 remain in the closed state, and the third electromagnetic valve 530 and the fourth electromagnetic valve 540 remain in the conductive state, so that the build-up chamber 310 is in a closed state between the first wheel set and the second wheel set, and when the driver steps on the pedal 50, the first brake cylinder 510 and the second brake cylinder 520 can respectively extract the oil in the second oil storage chamber 120 and the third oil storage chamber 130 to generate hydraulic pressure, and then the first brake cylinder 510 can transmit the generated hydraulic pressure to the first wheel set through the third electromagnetic valve 530, and the second brake cylinder 520 can transmit the generated hydraulic pressure to the second wheel set through the fourth electromagnetic valve 540, to meet the braking demand of the vehicle.

[0045] In combination with FIGS. 1-2, in some embodiments, a first pressure sensor 810 is arranged between the first line 11 and the second build-up module, and a second pressure sensor 820 is arranged between the second line 21 and the second build-up module.

[0046] It can be understood that when the redundant braking circuit is working, the second build-up module extracts the oil in the second oil storage chamber 120 and the third oil storage chamber 130 through the first line 11 and the second line 21 to build pressure and generate hydraulic pressure. During this process, the oil entering the second build-up module from the first line 11 can pass through the first pressure sensor 810 and be detected, and the oil entering the second build-up module from the second line 21 can pass through the second pressure sensor 820 and be detected, so that the hydraulic pressure in the redundant braking circuit can be monitored more preferably. When the main braking circuit is working, the build-up chamber 310 extracts the oil in the first oil storage chamber 110 to build pressure and generate hydraulic pressure. During this process, the build-up chamber 310 transmits the hydraulic pressure to the first wheel end through the first electromagnetic valve 311

[0047] and transmits the hydraulic pressure to the second wheel end through the second electromagnetic valve 312, and during the process that the build-up chamber 310 transmits the hydraulic pressure to the first wheel end through the first electromagnetic valve 311, the oil passes between the first line 11 and the second build-up module, and during the process that the build-up chamber 310 transmits the hydraulic pressure to the second wheel end through the second electromagnetic valve 312, the oil passes between the second line 21 and the second build-up module, so that the first pressure sensor 810 and the second pressure sensor 820 can also more preferably monitor the hydraulic pressure in the main braking circuit when the main braking circuit is working.

[0048] In some embodiments, the pedal feeling module includes an analog chamber 610, one end of the analog chamber 610 can be connected to at least one of the second oil storage chamber 120 and the third oil storage chamber 130, and the other end of the analog chamber 610 is connected between the build-up chamber 310 and the first oil storage chamber 110.

[0049] In some embodiments, a sealing ring can be arranged in the simulation cavity 610, and the sealing ring can isolate the simulation cavity 610 from the first oil storage cavity 110 and the pressure building cavity 310, so that the fourth pipeline 40 on the other end of the simulation cavity 610 can be cancelled, and the other end of the simulation cavity 610 is directly connected to the air.

[0050] The embodiment of the application also provides a hydraulic decoupling type electronic hydraulic brake system, which comprises an oil pot module, a wheel end module, a pedal sensing module, a main brake circuit, a redundant brake circuit and a mechanical brake circuit.

[0051] The oil pot module has a first oil storage cavity 110, a second oil storage cavity 120 and a third oil storage cavity 130.

[0052] The wheel end module comprises a first wheel group and a second wheel group, wherein the first wheel group and the second wheel group each comprise two wheels 210, and each wheel 210 is matched with a booster valve 211 and a first pressure reducing valve 212.

[0053] The main brake circuit comprises a pressure building cavity 310, a first electromagnetic valve 311 and a second electromagnetic valve 312, wherein the pressure building cavity 310 is connected to the first oil storage cavity 110 through a first pipeline 10, the pressure building cavity 310 is connected to the first wheel group through a second pipeline 20, the pressure building cavity 310 is connected to the second wheel group through a third pipeline 30, the first electromagnetic valve 311 is arranged on the second pipeline 20, and the second electromagnetic valve 312 is arranged on the third pipeline 30.

[0054] The redundant brake circuit comprises a first line 11, a second line 21 and a second pressure building module, the second pressure building module comprises a redundant motor 410 and two pump bodies 420, wherein one end of the first line 11 is connected to the second oil storage cavity 120, the other end of the first line 11 is connected to the second pipeline 20 between the first electromagnetic valve 311 and the first wheel group, one end of the second line 21 is connected to the third oil storage cavity 130, the other end of the second line 21 is connected to the third pipeline 30 between the second electromagnetic valve 312 and the second wheel group, a first check valve 12 is arranged on the first line 11, and a second check valve 22 is arranged on the second line 21; the redundant motor 410 is connected to the second pipeline 20 and the third pipeline 30 through the two pump bodies 420 respectively.

[0055] The mechanical brake circuit comprises a first brake cylinder 510, a second brake cylinder 520, a third electromagnetic valve 530 and a fourth electromagnetic valve 540, wherein the foot pedal 50 is directly connected to the first brake cylinder 510 and the second brake cylinder 520, the first brake cylinder 510 is connected to the second oil storage cavity 120 on one side and connected to the second pipeline 20 between the first electromagnetic valve 311 and the first wheel group through the third electromagnetic valve 530 on the other side, and the second brake cylinder 520 is connected to the third oil storage cavity 130 on one side and connected to the third pipeline 30 between the second electromagnetic valve 312 and the second wheel group through the fourth electromagnetic valve 540 on the other side.

[0056] The pedal feeling module comprises an analog cavity 610 and a fifth electromagnetic valve 620, wherein one end of the analog cavity 610 is connected to the first brake cylinder 510 through the fifth electromagnetic valve 620, and the other end of the analog cavity 610 is connected to the first pipeline 10 through the fourth pipeline 40.

[0057] Wherein, the sixth electromagnetic valve 710 is further arranged at the position of the second pipeline 20 close to the first wheel group, and the seventh electromagnetic valve 720 is further arranged at the position of the third pipeline 30 close to the second wheel group. The eighth electromagnetic valve 730 is arranged in parallel with the sixth electromagnetic valve 710, and the ninth electromagnetic valve 740 is arranged in parallel with the seventh electromagnetic valve 720.

[0058] As shown in FIGS. 2-5, a filter screen 910 is further arranged in the hydraulic decoupling type electronic hydraulic brake system, wherein the filter screen 910 can be arranged at the liquid inlet and liquid outlet of different devices, of course, the filter screen 910 can also be arranged in the oil pipeline, for example, arranged on the first pipeline 10, the second pipeline 20, the third pipeline 30, the fourth pipeline 40, the first line 11 or the second line 21; the impurities in the oil can be filtered through the arrangement of the filter screen 910, so as to ensure the cleanliness of the oil, thereby prolonging the service life of the oil.

[0059] In combination with FIGS. 1 and 3, when the vehicle adopts the main brake circuit, the third electromagnetic valve 530, the fourth electromagnetic valve 540, the eighth electromagnetic valve 730 and the ninth electromagnetic valve 740 remain in the closed state, the first electromagnetic valve 311, the second electromagnetic valve 312 and the fifth electromagnetic valve 620 remain in the conductive state, the pressure building cavity 310 draws the oil in the first oil storage cavity 110 to build pressure to generate hydraulic pressure, and then the hydraulic pressure is transmitted to the first wheel group and the second wheel group through the second pipeline 20 and the third pipeline 30 respectively.

[0060] In combination with FIGS. 1 and 5, when the vehicle adopts the redundant brake circuit, the first electromagnetic valve 311, the second electromagnetic valve 312, the third electromagnetic valve 530, the fourth electromagnetic valve 540, the sixth electromagnetic valve 710 and the seventh electromagnetic valve 720 all remain in the closed state, the fifth electromagnetic valve 620, the eighth electromagnetic valve 730 and the ninth electromagnetic valve 740 remain in the conducting state, the redundant motor 410 extracts the oil in the second oil storage cavity 120 and the third oil storage cavity 130 to build pressure and generate hydraulic pressure, which is then transmitted to the first wheel set and the second wheel set.

[0061] In combination with FIGS. 1 and 4, when the vehicle adopts the mechanical brake circuit, the first electromagnetic valve 311, the second electromagnetic valve 312, the fifth electromagnetic valve 620, the eighth electromagnetic valve 730 and the ninth electromagnetic valve 740 all remain in the closed state, the third electromagnetic valve 530 and the fourth electromagnetic valve 540 remain in the conducting state, the first brake cylinder 510 extracts the oil in the second oil storage cavity 120 to build pressure and generate hydraulic pressure, which is then transmitted to the first wheel set, and the second brake cylinder 520 extracts the oil in the third oil storage cavity 130 to build pressure and generate hydraulic pressure, which is then transmitted to the second wheel set.

[0062] It should be noted that, in the present embodiment, when the build pressure cavity 310 of the main brake circuit leaks, since the build pressure cavity 310 is only connected to the first oil storage cavity 110, the second oil storage cavity 120 and the third oil storage cavity 130 can still have sufficient oil to meet the normal work of the redundant brake circuit and the mechanical brake circuit. When the analog cavity 610 in the pedal feel module leaks, closing the fifth electromagnetic valve 620 will only cause the first oil storage cavity 110 to leak, while the second oil storage cavity 120 and the third oil storage cavity 130 can still have sufficient oil to meet the normal work of the redundant brake circuit and the mechanical brake circuit.

[0063] When the main brake circuit, the redundant brake circuit and the mechanical brake circuit all function normally, when the braking demand of the vehicle is large, for example, the vehicle needs a total of 180 bar of hydraulic pressure, and the build pressure cavity 310 of the main brake circuit can only generate 100 bar of hydraulic pressure, at this time, the redundant brake circuit can assist the work of the main brake circuit, the redundant brake circuit can work to generate an additional 80 bar of hydraulic pressure, so as to be able to provide 180 bar of hydraulic pressure for the wheel end module to meet the braking demand of the vehicle.

[0064] The present application has at least the following beneficial effects:

[0065] 1. In the process of vehicle driving, when the vehicle generates a braking request, the main brake circuit, the redundant brake circuit and the mechanical brake circuit can all generate hydraulic pressure by the oil provided by the oil canister module and transmit to the wheel end module, that is, the main brake circuit, the redundant brake circuit and the mechanical brake circuit can all meet the braking demand of the vehicle independently; therefore, when at least part of the first pressure building module and the mechanical pressure building module fails, the redundant brake circuit can still maintain complete function, so that the redundant brake circuit can generate hydraulic pressure by the oil provided by the oil canister module and transmit to the wheel end module to meet the braking demand of the vehicle.

[0066] 2. When the hydraulic pressure generated by the main brake circuit or the mechanical brake circuit or the main brake circuit plus the mechanical brake circuit is insufficient, that is, when the hydraulic pressure generated by the first pressure building module or the mechanical pressure building module or the first pressure building module plus the mechanical pressure building module is insufficient, the redundant brake circuit can be enabled to generate hydraulic pressure synchronously with the assistance of the redundant brake circuit to generate sufficient hydraulic pressure and transmit to the wheel end module to meet the braking demand of the vehicle.

[0067] Those skilled in the art can understand that the above embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and detail without departing from the spirit and scope of the present application.

Claims

1. A hydraulically decoupled electro-hydraulic brake system, wherein, The system comprises a main brake circuit, a redundant brake circuit and a mechanical brake circuit connected with an oil tank module and a wheel end module respectively; The main brake circuit comprises a first pressure building module connected with the oil tank module and the wheel end module; the mechanical brake circuit comprises a mechanical pressure building module connected with the oil tank module and the wheel end module; The oil tank module comprises at least a first oil storage cavity, a second oil storage cavity and a third oil storage cavity; the main brake circuit is connected with the first oil storage cavity; The redundant brake circuit comprises a second pressure building module connected with the second oil storage cavity and the third oil storage cavity; The redundant brake circuit and the mechanical brake circuit are connected with the second oil storage cavity and the third oil storage cavity respectively; The first pressure building module comprises a pressure building cavity, a first electromagnetic valve and a second electromagnetic valve; the wheel end module comprises a first wheel group and a second wheel group, and each of the first wheel group and the second wheel group comprises at least one wheel; The pressure building cavity is connected with the first wheel group through the first electromagnetic valve and connected with the second wheel group through the second electromagnetic valve; The redundant brake circuit further comprises a first line and a second line; One end of the first line is connected with the second oil storage cavity, and the other end is connected between the first electromagnetic valve and the first wheel group; one end of the second line is connected with the third oil storage cavity, and the other end is connected between the second electromagnetic valve and the second wheel group; One end of the second pressure building module is connected between the first electromagnetic valve and the first wheel group, and the other end is connected between the second electromagnetic valve and the second wheel group.

2. The hydraulically decoupled electro-hydraulic brake system of claim 1, wherein, Further comprising a pedal sensing module, one end of the pedal sensing module is connected with the second oil storage cavity and / or the third oil storage cavity, and the other end is connected between the first pressure building module and the first oil storage cavity.

3. The hydraulically decoupled electro-hydraulic brake system of claim 1, wherein, A first pressure sensor is arranged between the first line and the second pressure building module; a second pressure sensor is arranged between the second line and the second pressure building module.

4. The hydraulically decoupled electro-hydraulic brake system of claim 2, wherein, The pedal sensing module comprises an analog cavity, and a sealing ring is arranged at the analog cavity.

5. The hydraulically decoupled electro-hydraulic brake system of claim 1, wherein, The mechanical brake circuit comprises a first brake cylinder connected with the second oil storage cavity and a second brake cylinder connected with the third oil storage cavity; the first brake cylinder is further connected between the first electromagnetic valve and the first wheel group through a third electromagnetic valve, and the second brake cylinder is further connected between the second electromagnetic valve and the second wheel group through a fourth electromagnetic valve.

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