Hydraulically coupled electronic hydraulic braking system, method and vehicle

Abstract

The embodiments of the present application provide a hydraulically coupled electronic hydraulic brake system, method and vehicle, which relate to the field of vehicle braking. The system includes a mechanical brake module, a first brake module, a second brake module, an isolation valve, an oil pot module and a wheel end module. The mechanical brake module is connected to the oil pot module and the wheel end module respectively. The first brake module is connected to the oil pot module, the mechanical brake module and the wheel end module respectively. The second brake module is connected to the mechanical brake module, the first brake module and the wheel end module respectively. The mechanical brake module includes a two-position three-way valve, a pedal simulation module and a master cylinder. The two-position three-way valve is connected to the master cylinder and the pedal simulation module respectively. The two-position three-way valve is connected to the wheel end module. One end of the isolation valve is connected to the two-position three-way valve, and the other end of the isolation valve is connected to the first brake module to achieve isolation of the pedal simulation module and the first brake module. The first brake circuit and the second brake circuit are isolated by the isolation valve, thereby ensuring stable redundancy.

Description

Technical Field

[0001] The present application relates to the field of vehicle braking, and in particular to a hydraulically coupled electronic hydraulic braking system, method and vehicle. Background Art

[0002] In the development process of modern automobile braking systems, the TWOBOX solution has been widely used as an important technical route. This type of solution is mainly designed and optimized for energy recovery and stability redundancy during vehicle braking, aiming to improve the braking performance and safety of electric vehicles. The current mainstream TWOBOX solutions mainly include two categories:

[0003] On the one hand, there are decoupling or mechanical decoupling solutions represented by ibooster ESC HEV. This type of solution is applied to hybrid electric vehicles (HEV) by integrating an intelligent booster (ibooster) and an electronic stability control system (ESC). Its working principle is to use ibooster to achieve precise control of the brake pedal force and combine it with the ESC system to ensure the stability of the vehicle under different working conditions. However, in actual applications, it is found that this type of solution performs poorly in energy recovery, especially under conditions that require rapid response or complex road conditions, the problem of low energy recovery efficiency is more prominent.

[0004] On the other hand, there are hydraulic decoupling solutions represented by IPB RUB. This type of solution uses a hydraulic decoupling mechanism to achieve independent control of brake pressure. The IPB RUB (Integrated Power Brake with Redundant Unit Backup) solution particularly emphasizes the backup pressure building function, that is, when the main system fails, the RBU (Redundant Build-up Unit) can be used for left backup pressure building to ensure the continuous operation of the system. Despite this, this type of solution still has the problem of insufficient local stability redundancy, which may affect the overall safety and driving experience of the vehicle in certain specific scenarios.

[0005] The above two types of TWOBOX solutions have their own characteristics. In practical applications, the appropriate technical route is selected according to different vehicle models and usage requirements. However, no matter which solution is used, it faces its own technical challenges and needs further research and improvement to meet the growing market demand and technical standards. Summary of the invention

[0006] The purpose of the present application is to provide a hydraulically coupled electronic hydraulic brake system, method and vehicle, which can improve the stability of the hydraulically coupled electronic hydraulic brake system.

[0007] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0008] In a first aspect, an embodiment of the present application provides a hydraulically coupled electronic hydraulic brake system, the system comprising a mechanical brake module, a first brake module, a second brake module, an isolation valve, an oil pot module and a wheel end module, at least two of the mechanical brake module, the first brake module and the second brake module can cooperate with each other when a vehicle generates a braking request to provide a braking force to the wheel end module;

[0009] The mechanical brake module is connected to the oil tank module and the wheel end module respectively;

[0010] The first brake module is respectively connected to the oil tank module, the mechanical brake module and the wheel end module;

[0011] The second brake module is respectively connected to the mechanical brake module, the first brake module and the wheel end module;

[0012] The mechanical brake module includes a two-position three-way valve, a pedal simulation module and a master cylinder, wherein the two-position three-way valve is connected to the master cylinder and the pedal simulation module respectively to achieve isolation of the pedal simulation module from the first brake module;

[0013] The two-position three-way valve is connected to the wheel end module;

[0014] One end of the isolation valve is connected to the two-position three-way valve, and the other end of the isolation valve is connected to the first brake module to achieve isolation between the first brake circuit and the second brake circuit, wherein the first brake module includes the first brake circuit and the second brake circuit, and the wheel-end module includes the first wheel-end module and the second wheel-end module, the first brake circuit is connected to the first wheel-end module, and the second brake circuit is connected to the second wheel-end module.

[0015] In an optional embodiment, the first brake module includes an electric cylinder and a PSV valve;

[0016] The PSV valve is connected to the isolation valve and the electric cylinder respectively;

[0017] The PSV valve is connected to the second brake circuit.

[0018] In an optional embodiment, the second brake module includes an SV1 valve, an SV2 valve, an RV1 valve, an RV2 valve, a motor, a plunger pump, and an accumulator;

[0019] The SV1 valve is connected to a first plunger pump, the first plunger pump is connected to a first accumulator, the SV2 valve is connected to a second plunger pump, the second plunger pump is connected to a first accumulator, wherein the plunger pump includes a first plunger pump and a second plunger pump, and the accumulator includes a first accumulator and a second accumulator;

[0020] The first accumulator is connected to the first wheel-end module, and the second accumulator is connected to the second wheel-end module;

[0021] The motor is disposed between the first plunger pump and the second plunger pump, and the motor is connected to the SV1 valve, the SV2 valve, the RV1 valve, and the RV2 valve, respectively.

[0022] In an optional embodiment, a one-way valve is provided between the second brake module and the oil pot module, so that the accumulator or the motor can be replenished with fluid through the one-way valve based on the oil pot module.

[0023] In an optional embodiment, a one-way valve is provided between the PSV valve and the oil pot module so as to replenish fluid to the electric cylinder based on the oil pot module through the one-way valve.

[0024] In a second aspect, an embodiment of the present application provides a hydraulically coupled electronic hydraulic braking method, which is applied to the hydraulically coupled electronic hydraulic braking system, wherein the hydraulically coupled electronic hydraulic braking system includes a mechanical braking module, a first braking module, a second braking module, a two-position three-way valve, a pedal simulation module, and a wheel end module, and the method includes:

[0025] When the first brake module has no abnormal braking and receives a braking operation on the mechanical brake module, controlling the two-position three-way valve to be connected to the circuit of the pedal simulation module;

[0026] The circuit between the two-position three-way valve and the wheel-end module is controlled to be closed to isolate the pedal simulation module from the first brake module.

[0027] In an optional embodiment, the hydraulically coupled electronic hydraulic brake system further includes an electric cylinder, a PSV valve, and an isolation valve, the first brake module includes the first brake circuit and the second brake circuit, the wheel end module includes a first wheel end module and a second wheel end module, and the method further includes:

[0028] When receiving a braking operation on the mechanical brake module, controlling the circuit connection between the two-position three-way valve and the pedal simulation module;

[0029] Controlling the circuit closure between the two-position three-way valve and the wheel-end module;

[0030] Based on the braking operation, controlling the electric cylinder to establish a first pressure;

[0031] Controlling the conduction of the PSV valve;

[0032] The first pressure oil is pushed from the PSV valve to the second wheel end module through the second brake circuit;

[0033] Controlling the conduction of the isolation valve;

[0034] Based on the first pressure oil, the oil is pushed from the PSV valve and the isolation valve to the first wheel end module through the first brake circuit.

[0035] In an optional embodiment, the hydraulically coupled electronic hydraulic brake system further includes a master cylinder and an oil tank module, and the method further includes:

[0036] When leakage of the first brake circuit is detected, controlling the isolation valve to be in a closed state;

[0037] When receiving the braking operation of the mechanical brake module, controlling the circuit conduction between the two-position three-way valve and the isolation valve;

[0038] Controlling the circuit closure of the two-position three-way valve and the pedal simulation module;

[0039] Based on the braking operation, the master cylinder builds up a second pressure;

[0040] Based on the second pressure, oil is pushed from the oiler module to the first wheel end module;

[0041] Based on the braking operation, controlling the electric cylinder to establish a third pressure;

[0042] Based on the third pressure, oil is pushed from the oiler module to the second wheel-end module.

[0043] In an optional embodiment, the method further comprises:

[0044] When leakage of the second brake circuit is detected, controlling the isolation valve to be in a closed state;

[0045] When receiving the braking operation of the mechanical brake module, controlling the circuit conduction between the two-position three-way valve and the isolation valve;

[0046] Controlling the circuit closure of the two-position three-way valve and the pedal simulation module;

[0047] Based on the braking operation, the master cylinder establishes a fourth pressure;

[0048] Based on the fourth pressure, oil is pushed from the oiler module to the first wheel-end module.

[0049] In a third aspect, an embodiment of the present application provides a vehicle, comprising the hydraulically coupled electronic hydraulic braking system.

[0050] This application has the following beneficial effects:

[0051] The hydraulically coupled electronic hydraulic braking system of the present application includes a mechanical braking module, a first braking module, a second braking module, an isolation valve, an oil pot module and a wheel-end module. At least two of the mechanical braking module, the first braking module and the second braking module can cooperate with each other when the vehicle generates a braking request to provide sufficient braking force for the wheel-end module. The mechanical braking module is respectively connected to the oil pot module and the wheel-end module, and the first braking module is respectively connected to the oil pot module, the mechanical braking module and the wheel-end module. The second brake module is respectively connected to the mechanical brake module, the first brake module and the wheel-end module, the mechanical brake module includes a two-position three-way valve, a pedal simulation module and a master cylinder, the two-position three-way valve is respectively connected to the master cylinder and the pedal simulation module, the two-position three-way valve is connected to the wheel-end module, one end of the isolation valve is connected to the two-position three-way valve, and the other end of the isolation valve is connected to the first brake module to achieve isolation between the first brake circuit and the second brake circuit, wherein the first brake module includes a first brake circuit and a second brake circuit, the wheel-end module includes a first wheel-end module and a second wheel-end module, the first brake circuit is connected to the first wheel-end module, and the second brake circuit is connected to the second wheel-end module, the pedal simulation module and the first brake circuit are isolated by setting a two-position three-way valve, and the first brake circuit and the second brake circuit of the first brake module are isolated by the isolation valve, thereby ensuring stable redundancy capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 The structural intention of a hydraulically coupled electronic hydraulic brake provided in an embodiment of the present application;

[0054] Figure 2 One of the flow charts of a hydraulic coupling type electronic hydraulic braking method provided in an embodiment of the present application;

[0055] Figure 3 A second flow chart of a hydraulic coupling type electronic hydraulic braking method provided in an embodiment of the present application;

[0056] Figure 4A third flow chart of a hydraulic coupling type electronic hydraulic braking method provided in an embodiment of the present application;

[0057] Figure 5 The fourth flowchart of a hydraulically coupled electronic hydraulic braking method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0060] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0061] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0063] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] After extensive research, the inventors found that the existing TWOBOX solution selects the appropriate technical route according to different vehicle models and usage requirements in actual applications. However, no matter which solution is used, it faces its own technical challenges and requires further research and improvement to meet the growing market demand and technical standards.

[0065] In view of the discovery of the above problems, the present embodiment provides a hydraulically coupled electronic hydraulic braking system, method and vehicle. The hydraulically coupled electronic hydraulic braking system includes a mechanical braking module, a first braking module, a second braking module, an isolation valve, an oil pot module and a wheel end module. At least two of the mechanical braking module, the first braking module and the second braking module can cooperate with each other when the vehicle generates a braking request to provide sufficient braking force for the wheel end module. The mechanical braking module is respectively connected to the oil pot module and the wheel end module, and the first braking module is respectively connected to the oil pot module, the mechanical braking module and the wheel end module. The second braking module is respectively connected to the mechanical braking module, the first braking module and the wheel-end module, the mechanical braking module includes a two-position three-way valve, a pedal simulation module and a master cylinder, the two-position three-way valve is respectively connected to the master cylinder and the pedal simulation module, the two-position three-way valve is connected to the wheel-end module, one end of the isolation valve is connected to the two-position three-way valve, and the other end of the isolation valve is connected to the first braking module to achieve isolation between the first braking circuit and the second braking circuit, wherein the first braking module includes a first braking circuit and a second braking circuit, the wheel-end module includes a first wheel-end module and a second wheel-end module, the first braking circuit is connected to the first wheel-end module, and the second braking circuit is connected to the second wheel-end module, the pedal simulation module and the first braking circuit are isolated by setting a two-position three-way valve, and the first braking circuit and the second braking circuit of the first braking module are isolated by the isolation valve, thereby ensuring stable redundancy capability. The scheme provided in this embodiment is elaborated in detail below.

[0066] Please refer to Figure 1 , Figure 1 The figure is a structural diagram of a hydraulically coupled electronic hydraulic brake system.

[0067] A hydraulically coupled electronic hydraulic braking system includes a mechanical braking module 10, a first braking module 20, a second braking module 30, an isolation valve 40, an oil tank module 50 and a wheel end module 60. At least two of the mechanical braking module 10, the first braking module 20 and the second braking module 30 can cooperate with each other to provide braking force for the wheel end module 60 when the vehicle generates a braking request.

[0068] The mechanical brake module 10 is connected to the oil pot module 50 and the wheel end module 60 respectively; the first brake module 20 is connected to the oil pot module 50, the mechanical brake module 10 and the wheel end module 60 respectively; the second brake module 30 is connected to the mechanical brake module 10, the first brake module 20 and the wheel end module 60 respectively; the mechanical brake module 10 includes a two-position three-way valve 111, a pedal simulation module 112 and a master cylinder 113, and the two-position three-way valve 111 is connected to the master cylinder 113 and the pedal simulation module 112 respectively to realize the connection between the pedal simulation module 112 and the first brake module 30. Isolation of a brake module 20; the two-position three-way valve 111 is connected to the wheel-end module 60; one end of the isolation valve 40 is connected to the two-position three-way valve 111, and the other end of the isolation valve 40 is connected to the first brake module 20, so as to achieve isolation of the first brake circuit and the second brake circuit, wherein the first brake module 20 includes the first brake circuit and the second brake circuit, and the wheel-end module 60 includes a first wheel-end module 611 and a second wheel-end module 612, the first brake circuit is connected to the first wheel-end module 611, and the second brake circuit is connected to the second wheel-end module 612.

[0069] When the hydraulically coupled electronic hydraulic brake system of the present application is used for braking, the driver's pedaling operation on the pedal in the mechanical brake module 10 is received, and the two-position three-way valve SV, the isolation valve CSV and the PSV valve are all in the power-off state, that is, the circuit of the two-position three-way valve SV and the isolation valve are disconnected, so that the pedal simulation module 112 is isolated from the first brake module 20. Since the two-position three-way valve SV is connected to the wheel-end module 60, the circuit of the two-position three-way valve SV and the isolation valve is disconnected, so that the pedal simulation module and the second brake module 30 can be isolated. The circuit of the two-position three-way valve SV and the pedal simulation module 112 is connected, and the brake fluid enters the pedal simulation module 112 from the master cylinder 113 to provide the driver with a pedal feel. Based on the pedaling operation on the master cylinder 113, the first brake module 20 builds up pressure, and pushes the fluid pressure to the wheel-end module 60 through the PSV valve and the CSV valve to perform braking.

[0070] like Figure 1 As shown, since the isolation valve 40 is arranged between the two-position three-way valve 111 and the PSV valve, the first brake circuit and the second brake circuit of the first brake module 20 can be isolated by controlling the conduction state of the isolation valve, thereby avoiding the problem of poor braking effect due to leakage in any brake circuit of the first brake module.

[0071] Still refer to Figure 1 The first brake module 20 includes an electric cylinder 211 and a PSV valve, one end of the PSV valve is connected to the electric cylinder 211, the other end of the PSV valve is connected to the second brake circuit, and the second brake circuit is connected to the second wheel-end module 612.

[0072] It should be noted that, in the first brake module, the first brake circuit is a circuit connected to the first wheel-end module 611 and the isolation valve 40, and the second brake circuit is a circuit connected to the PSV valve and the second wheel-end module 612. The first wheel-end module is braked by the first brake circuit, and the second wheel-end module is braked by the second brake circuit.

[0073] Still refer to Figure 1 , the second brake module 30 includes an SV1 valve, an SV2 valve, an RV1 valve, an RV2 valve, a motor 311 , a plunger pump 312 and an accumulator 313 ;

[0074] The SV1 valve is connected to the first plunger pump, the first plunger pump is connected to the first accumulator, the SV2 valve is connected to the second plunger pump, the second plunger pump is connected to the first accumulator, wherein the plunger pump 312 includes the first plunger pump and the second plunger pump, and the accumulator 313 includes the first accumulator and the second accumulator; the first accumulator is connected to the first wheel-end module 611, and the second accumulator is connected to the second wheel-end module 612; the motor 311 is arranged between the first plunger pump and the second plunger pump, and the motor 311 is respectively connected to the SV1 valve, SV2 valve, RV1 valve and RV2 valve.

[0075] The role of the second brake module 30 in the entire hydraulically coupled electronic hydraulic brake system is as follows: when the mechanical brake module 10, the first brake module 20 and the second brake module 30 are all functioning normally, and when the vehicle's braking demand is large, for example, the vehicle requires a total braking force of 200 bar, but only 150 bar of braking force can be established through the first brake module 20, at this time, the second brake module 30 can be controlled to build pressure to assist in cooperating with the work of the first brake module 20, and the second brake module 30 can be controlled to build a pressure of 50 bar, thereby providing 200 bar of braking force to the wheel end module 60, thereby meeting the vehicle's braking demand.

[0076] In the entire hydraulically coupled electronic hydraulic brake system, when the first brake module 20 leaks and cannot brake the vehicle, the second brake module 30 can provide braking force for the wheel end module 60 .

[0077] The SV1 valve is connected to the first plunger pump, the first plunger pump is connected to the first accumulator, the SV2 valve is connected to the second plunger pump, the second plunger pump is connected to the second accumulator, the first accumulator and the second accumulator can be used to store oil, when the oil in the first accumulator and the second accumulator is insufficient, the SV1 valve and the SV2 valve can be controlled to be turned on, so that the oil can be pumped from the oil pot module 50 into the first accumulator and the second accumulator based on the first plunger pump and the second plunger pump.

[0078] When the first brake module 20 cannot provide braking force normally, the SV1 valve, SV2 valve, RV1 valve and RV2 valve are set to a closed state, and the motor 311 of the second brake module 30 builds pressure to provide braking force for the wheel end module 60.

[0079] like Figure 1 As shown, a one-way valve is arranged between the second brake module 30 and the oil tank module 50, one end of the one-way valve is connected to the oil tank module 50, and the other end of the one-way valve is connected to the PSV valve. The PSV valve can be controlled to be in a conducting state, and the electric cylinder 211 can be replenished with fluid through a circuit formed by the one-way valve and the PSV valve.

[0080] The one-way valve is also connected to the second brake module 30 , and fluid can be replenished to the accumulator 313 or the motor 311 based on the oil tank module 50 through the one-way valve.

[0081] like Figure 2 The figure shows a flow chart of a hydraulically coupled electronic hydraulic braking method, and each step is explained below.

[0082] The hydraulically coupled electronic hydraulic braking method is applied to a hydraulically coupled electronic hydraulic braking system.

[0083] S201: When there is no abnormality in the braking of the first brake module and a braking operation of the mechanical brake module is received, the circuit of the two-position three-way valve and the pedal simulation module is controlled to be connected.

[0084] S202: Control the circuit between the two-position three-way valve and the wheel-end module to close, so as to isolate the pedal simulation module from the first brake module.

[0085] When the driver's braking operation on the pedal in the mechanical brake module 10 is received, the circuit of the two-position three-way valve SV and the isolation valve is disconnected, and the circuit of the two-position three-way valve and the pedal simulation module is connected. When the driver brakes the pedal, based on the braking operation, the master cylinder of the mechanical brake module builds up pressure, and based on the connected circuit of the two-position three-way valve and the pedal simulation module, the pedal simulation module is hydraulically pushed in, thereby providing the driver with a pedal feel.

[0086] The circuits of the two-position three-way valve and the isolation valve CSV are controlled to be closed, so that the hydraulic pressure cannot leak from other circuits, thereby isolating the pedal simulation module 112 from the first brake module 20 .

[0087] The braking method based on the hydraulic coupling type electronic hydraulic braking system also includes, for example Figure 3 FIG. 1 is a flow chart of a hydraulic coupling type electronic hydraulic braking method, comprising the following steps:

[0088] S301: When receiving a braking operation on a mechanical brake module, control the circuit connection between the two-position three-way valve and the pedal simulation module.

[0089] S302: Control the circuit between the two-position three-way valve and the wheel-end module to close.

[0090] S303: Based on the braking operation, control the electric cylinder to establish a first pressure.

[0091] S304: Control the PSV valve to be open.

[0092] S305: Based on the first pressure oil, it is pushed from the PSV valve to the second wheel end module through the second brake circuit.

[0093] S306: Control the isolation valve to be open.

[0094] S307: Based on the first pressure oil, it is pushed from the PSV valve and the isolation valve to the first wheel end through the first brake circuit.

[0095] During normal braking based on hydraulically coupled electronic hydraulic braking, when the driver steps on the pedal, the mechanical brake module 10 receives the braking operation, controls the circuit connection between the two-position three-way valve SV and the pedal simulation module 112, controls the circuit between the two-position three-way valve SV and the isolation valve 40 or controls the circuit between the two-position three-way valve SV and the wheel-end module 60 to be closed, so that the pressure building circuit of the mechanical brake module 10 is isolated from the first brake module 20, and provides the driver with a pedal feel based on the pedal simulation module.

[0096] Based on the braking operation, the motor corresponding to the electric cylinder rotates to establish a first pressure, and controls the PSV valve to be in an on state so that the first pressure can be pushed to the second wheel end module through the PSV valve.

[0097] The isolation valve CSV is controlled to be turned on. Since the isolation valve CSV is connected to the first wheel end module, when the isolation valve is turned on, the first pressure can be pushed to the first wheel end module through the PSV valve and the isolation valve CSV, thereby achieving vehicle braking.

[0098] The braking method based on the hydraulic coupling type electronic hydraulic braking system also includes, for example Figure 4 FIG. 1 is a flow chart of a hydraulic coupling type electronic hydraulic braking method, comprising the following steps:

[0099] S401: When leakage in the first brake circuit is detected, the isolation valve is controlled to be in a closed state.

[0100] S402: When a braking operation of the mechanical brake module is received, the circuits of the two-position three-way valve and the isolation valve are controlled to be conductive.

[0101] S403: Control the circuit closure of the two-position three-way valve and the pedal simulation module.

[0102] S404: Based on the braking operation, the master cylinder builds up a second pressure.

[0103] S405: Based on the second pressure, the oil is pushed from the oil tank module to the first wheel end module.

[0104] S406: Based on the braking operation, control the electric cylinder to establish a third pressure.

[0105] S407: Based on the third pressure, the oil is pushed from the oil tank module to the second wheel end module.

[0106] When a single-point leakage occurs in the brake circuit of the first brake module, the following description is given by assuming that a leakage occurs in the first brake circuit of the first brake module.

[0107] When leakage occurs in the first brake circuit of the first brake module, the control isolation valve CSV is in a closed state, so that the first brake circuit is isolated from the second brake circuit.

[0108] When the first brake circuit leaks, the electric cylinder of the first brake module cannot provide braking force for the first wheel end module. Therefore, the first wheel end module can be braked based on mechanical backup. For example, the driver brakes the pedal of the mechanical brake module to control the circuit conduction of the two-position three-way valve and the isolation valve, and controls the circuit closure of the two-position three-way valve and the pedal simulation module. The master cylinder of the mechanical brake module establishes a second pressure based on the braking operation, and pushes the oil from the oil pot module to the first wheel end module based on the second pressure to brake the first wheel end module. The electric cylinder of the first brake module establishes a third pressure, and pushes the oil from the oil pot module to the second wheel end module based on the third pressure to brake the second wheel end module.

[0109] In the above manner, when the first brake circuit leaks and the first wheel end module cannot be braked, the first wheel end module can be braked based on mechanical backup, and the second wheel end module can be braked based on the electric cylinder, so that all four wheels of the vehicle can be braked.

[0110] The braking method based on the hydraulic coupling type electronic hydraulic braking system also includes, for example Figure 5 FIG. 1 is a flow chart of a hydraulic coupling type electronic hydraulic braking method, comprising the following steps:

[0111] S501: When leakage of the second brake circuit is detected, the isolation valve is controlled to be in a closed state.

[0112] S502: When a braking operation from a mechanical brake module is received, the circuits of the two-position three-way valve and the isolation valve are controlled to be conductive.

[0113] S503: Control the circuit closure of the two-position three-way valve and the pedal simulation module.

[0114] S504: Based on the braking operation, the master cylinder builds up a fourth pressure.

[0115] S505: Based on the fourth pressure, the oil is pushed from the oil tank module to the first wheel end module.

[0116] When a single-point leakage occurs in the brake circuit of the first brake module, the following description is given by assuming that a leakage occurs in the second brake circuit of the first brake module.

[0117] When leakage occurs in the second brake circuit of the first brake module, the control isolation valve CSV is in a closed state, so that the first brake circuit is isolated from the second brake circuit.

[0118] When the second brake circuit leaks, the electric cylinder of the first brake module cannot provide braking force to the second wheel end module. The vehicle is braked based on mechanical backup. The driver brakes the pedal of the mechanical brake module to control the circuit conduction of the two-position three-way valve and the isolation valve, and controls the circuit closure of the two-position three-way valve and the pedal simulation module. Based on the braking operation, the master cylinder establishes a fourth pressure, and based on the fourth pressure, the oil is pushed from the oil tank module to the first wheel end module to achieve braking of the vehicle.

[0119] When there is a leak in the first brake circuit or the second brake circuit of the first brake module, the first brake circuit and the second brake circuit can be isolated based on the isolation valve, thereby ensuring that at least one circuit can build pressure normally and ensuring that the vehicle can be braked.

[0120] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0121] In addition, each functional module in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk.

[0122] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0123] The above are only various implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A hydraulically coupled electronic hydraulic brake system, characterized in that: The system comprises a mechanical brake module, a first brake module, a second brake module, an isolation valve, an oil tank module and a wheel end module, wherein at least two of the mechanical brake module, the first brake module and the second brake module cooperate with each other when a braking request is generated by the vehicle to provide braking force to the wheel end module; The mechanical brake module is connected to the oil tank module and the wheel end module respectively; The first brake module is respectively connected to the oil tank module, the mechanical brake module and the wheel end module; The second brake module is respectively connected to the mechanical brake module, the first brake module and the wheel end module; The mechanical brake module includes a two-position three-way valve, a pedal simulation module and a master cylinder, wherein the two-position three-way valve is connected to the master cylinder and the pedal simulation module respectively to achieve isolation of the pedal simulation module from the first brake module; The two-position three-way valve is connected to the wheel end module; One end of the isolation valve is connected to the two-position three-way valve, and the other end of the isolation valve is connected to the first brake module to achieve isolation between the first brake circuit and the second brake circuit, wherein the first brake module includes the first brake circuit and the second brake circuit, and the wheel-end module includes the first wheel-end module and the second wheel-end module, the first brake circuit is connected to the first wheel-end module, and the second brake circuit is connected to the second wheel-end module.

2. The system according to claim 1, characterized in that The first brake module includes an electric cylinder and a PSV valve; The PSV valve is connected to the isolation valve and the electric cylinder respectively; The PSV valve is connected to the second brake circuit.

3. The system according to claim 1, characterized in that The second brake module includes an SV1 valve, an SV2 valve, an RV1 valve, an RV2 valve, a motor, a plunger pump and an accumulator; The SV1 valve is connected to a first plunger pump, the first plunger pump is connected to a first accumulator, the SV2 valve is connected to a second plunger pump, the second plunger pump is connected to a first accumulator, wherein the plunger pump includes a first plunger pump and a second plunger pump, and the accumulator includes a first accumulator and a second accumulator; The first accumulator is connected to the first wheel-end module, and the second accumulator is connected to the second wheel-end module; The motor is disposed between the first plunger pump and the second plunger pump, and the motor is connected to the SV1 valve, the SV2 valve, the RV1 valve, and the RV2 valve, respectively.

4. The system according to claim 3, characterized in that A one-way valve is provided between the second brake module and the oil pot module so as to replenish the accumulator or the motor with fluid through the one-way valve based on the oil pot module.

5. The system according to claim 2, characterized in that A one-way valve is provided between the PSV valve and the oil pot module so as to replenish the electric cylinder with fluid through the one-way valve based on the oil pot module.

6. A hydraulically coupled electronic hydraulic braking method, applied to the hydraulically coupled electronic hydraulic braking system according to any one of claims 1 to 5, wherein the hydraulically coupled electronic hydraulic braking system comprises a mechanical braking module, a first braking module, a second braking module, a two-position three-way valve, a pedal simulation module and a wheel end module, wherein: The method comprises: When the first brake module has no abnormal braking and receives a braking operation on the mechanical brake module, controlling the two-position three-way valve to be connected to the circuit of the pedal simulation module; The circuit between the two-position three-way valve and the wheel-end module is controlled to be closed to isolate the pedal simulation module from the first brake module.

7. The method according to claim 6, characterized in that The hydraulically coupled electronic hydraulic brake system further includes an electric cylinder, a PSV valve, and an isolation valve; the first brake module includes the first brake circuit and the second brake circuit; the wheel end module includes a first wheel end module and a second wheel end module; and the method further includes: When receiving a braking operation on the mechanical brake module, controlling the circuit connection between the two-position three-way valve and the pedal simulation module; Controlling the circuit closure between the two-position three-way valve and the wheel-end module; Based on the braking operation, controlling the electric cylinder to establish a first pressure; Controlling the conduction of the PSV valve; Based on the first pressure oil being pushed from the PSV valve to the second wheel end module through the second brake circuit; Controlling the conduction of the isolation valve; Based on the first pressure oil, the oil is pushed from the PSV valve and the isolation valve to the first wheel end module through the first brake circuit.

8. The method according to claim 7, characterized in that The hydraulically coupled electronic hydraulic brake system further includes a master cylinder and an oil pot module, and the method further includes: When leakage of the first brake circuit is detected, controlling the isolation valve to be in a closed state; When receiving the braking operation of the mechanical brake module, controlling the circuit conduction between the two-position three-way valve and the isolation valve; Controlling the circuit closure of the two-position three-way valve and the pedal simulation module; Based on the braking operation, the master cylinder builds up a second pressure; Based on the second pressure, oil is pushed from the oiler module to the first wheel end module; Based on the braking operation, controlling the electric cylinder to establish a third pressure; Based on the third pressure, oil is pushed from the oiler module to the second wheel-end module.

9. The method according to claim 8, characterized in that The method further comprises: When leakage of the second brake circuit is detected, controlling the isolation valve to be in a closed state; When receiving the braking operation of the mechanical brake module, controlling the circuit conduction between the two-position three-way valve and the isolation valve; Controlling the circuit closure of the two-position three-way valve and the pedal simulation module; Based on the braking operation, the master cylinder establishes a fourth pressure; Based on the fourth pressure, oil is pushed from the oiler module to the first wheel-end module.

10. A vehicle, characterized in that: It comprises a hydraulically coupled electronic hydraulic brake system as described in any one of claims 1 to 5.

Images