Semi-decoupling series wet pedal simulator

Abstract

The invention discloses a semi-decoupling series wet pedal simulator which comprises an aluminum valve body, a left simulator cavity and a right manpower pressure building cavity are arranged in the aluminum valve body in series in the axial direction, and the two cavities are separated through a middle partition plate with a plurality of through holes. The manual pressure buildup mechanism comprises a push rod, a piston, a sealing piece and a reset spring, and a first oil outlet in the bottom of the manual pressure buildup mechanism communicates with a rear wheel brake oil way through a CSV normally-open valve. The simulator mechanism comprises a piston, a guide rod, an elastomer assembly and a sealing cover; the guide rod penetrates through the through hole of the partition plate and extends into the manual pressure building cavity, and an initial gap is kept between the guide rod and the manual piston; the elastomer assembly is of a composite structure composed of a supporting base, an inner spring, a rubber elastomer and an outer spring which are sequentially arranged in a sleeved mode from inside to outside. And a second oil outlet at the bottom of the simulator cavity is alternatively communicated with an oil pot or other wheel end brake oil ways through a two-position three-way valve, so that the redundant backup and accurate simulation of pedal feeling under a compact structure can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile braking systems, in particular to a semi-decoupling series wet pedal simulator. BACKGROUND

[0002] With the continuous advancement of the electrification trend of automobiles, the power assist module of the vehicle braking system has gradually been replaced by an electronic power booster from the engine vacuum booster of traditional fuel vehicles. The mainstream EHB braking systems on the current market are mainly divided into one-box and two-box technical solutions. The actuators of the above two types of solutions are biased towards structural integration and functional diversification development. Although multifunctional integration can be achieved, it also leads to a larger size of the actuator, and the system matching and replaceability of the core components such as the pedal simulator and the master cylinder are poor, which brings inconvenience to the layout and maintenance of the vehicle braking system.

[0003] The pedal simulator, as a key component of the EHB system, functions to simulate the real brake pedal feel through an elastic body assembly or gas and liquid medium during the conventional brake power assist process, ensuring that the driver obtains accurate operation feedback. The current mainstream pedal simulator design is divided into dry and wet types, namely dry simulator and wet simulator. The dry simulator mainly uses a multi-layer spring structure to realize pedal force simulation, and the structure is relatively simple but has limited adaptability. The wet simulator adjusts the system stiffness by controlling the opening degree of the electromagnetic valve to simulate the pedal force, and is more suitable for hydraulic actuators. However, the existing wet simulator scheme mostly integrates the simulator with the hydraulic actuator master valve body, or adopts a separate design of the simulator and the human power build pressure cylinder, i.e. the simulator is an independent cavity connected with the human power build pressure source through a pipeline, and relies on liquid medium to transfer force to generate pedal feel feedback. This separate structure further aggravates the problems of system volume redundancy and assembly complexity. SUMMARY

[0004] The present specification provides a semi-decoupling series wet pedal simulator to overcome at least one technical problem in the related art.

[0005] The present specification provides a semi-decoupling series wet pedal simulator, comprising: An aluminum valve body, the aluminum valve body is internally provided with two coaxial and series arranged cavities along the axial direction, namely a simulator cavity on the left side and a human power build pressure cavity on the right side, the two cavities are separated by an intermediate partition plate, and a plurality of through holes for transmitting hydraulic pressure are arranged on the intermediate partition plate; A human force pressing mechanism is assembled in the human force pressing cavity, comprising a human force pressing cavity push rod, a human force pressing cavity piston, a secondary sealing element, a primary sealing element, and a human force pressing unit spring, the human force pressing cavity push rod penetrates the right end cover of the aluminum valve body in the axial direction, the human force pressing cavity piston is connected to the left end of the human force pressing cavity push rod, the secondary sealing element and the primary sealing element are respectively arranged on the two sides of the human force pressing cavity piston, and the human force pressing unit spring is arranged in the human force pressing cavity. The human force pressing cavity is provided with a first oil outlet, the first oil outlet is connected with a CSV normally open valve, and the CSV normally open valve is in communication with the rear wheel brake oil circuit of the vehicle. A simulator mechanism is assembled in the simulator cavity, comprising a simulator piston, a guide rod, an elastomer assembly, and a simulator cover, the simulator piston is slidably assembled in the simulator cavity, the guide rod is arranged at the right end of the simulator piston and extends into the human force pressing cavity through the through hole on the intermediate partition plate, a preset initial gap is maintained between the simulator piston and the human force pressing cavity piston, the elastomer assembly is arranged on the left side of the simulator piston, and the simulator cover is fixedly connected to the left end of the aluminum valve body. The elastomer assembly comprises an inner spring and an outer spring coaxially sleeved from inside to outside, a spring support seat, a rubber elastomer, and a rubber elastomer support framework, the right ends of the inner spring and the outer spring are in contact with the left end of the simulator piston, the left ends are in contact with the right end surface of the spring support seat, the left end surface of the spring support seat is in contact with the right end of the rubber elastomer, the left end of the rubber elastomer is supported by the rubber elastomer support framework, the rubber elastomer support framework is supported on the simulator cover, and the outer spring is sleeved outside the inner spring. The simulator cavity is provided with a second oil outlet, the second oil outlet is connected with a two-position three-way valve, and the two-position three-way valve is selectively in communication with the oil can or the brake oil circuit of the remaining wheel ends of the vehicle.

[0006] In some optional embodiments, the simulator cover is fixedly connected to the left end of the aluminum valve body in a riveting or threaded connection manner.

[0007] In some optional embodiments, the CSV normally open valve is closed in the powered state and is opened in the unpowered state.

[0008] In some optional embodiments, the two-position three-way valve is in a position of connecting the simulator cavity and the wheel end in the unpowered state.

[0009] In some optional embodiments, the number of through holes on the intermediate partition plate is 3-6, which are uniformly distributed around the guide rod, a simulator sealing element is arranged between the simulator piston and the aluminum valve body, and the simulator cavity is sealed.

[0010] In some optional embodiments, the human force pressing unit spring is sleeved on the human force pressing chamber push rod, with the right end supported on the aluminum valve body right end cover and the left end supported on the human force pressing chamber piston; the human force pressing chamber piston is fixedly connected with the human force pressing chamber push rod or is in an integral molding structure.

[0011] In some optional embodiments, the spring support seat is in a split structure with the simulator piston, and the rubber elastic body support framework is in a split structure with the simulator cover.

[0012] In some optional embodiments, the rubber elastic body is in a cylindrical structure.

[0013] The beneficial effects of the embodiments of the present application are as follows: 1. The technical scheme of the present application arranges the human force pressing chamber and the simulator chamber coaxially and in series inside a single aluminum valve body, replacing the traditional design of the human force pressing unit and the simulator unit as two separate bodies. This highly integrated structure can improve the space utilization efficiency, making the entire pedal simulator smaller in size and more compact in structure. At the same time, the integrated valve body can reduce the number of parts and complex connecting pipelines, simplify the assembly process, and thus reduce the manufacturing cost.

[0014] 2. The intermediate partition plate arranged between the two chambers and the plurality of through holes thereon can not only realize the hydraulic path of hydraulic pressure transmission between the two chambers, but also provide a physical channel for the passage of the guide rod. The preset initial gap designed between the guide rod and the human force pressing chamber piston can ensure the decoupling of the movement of the two pistons during normal braking, so that the simulator can independently provide pedal feeling. When the human force pressing chamber fails due to leakage, the gap is eliminated, and the guide rod and the human force pressing chamber piston come into mechanical contact, so that the force of the human force push rod can directly push the simulator piston to build pressure through the guide rod. Thus, when a single chamber leaks, the other chamber can be used to realize mechanical backup braking.

[0015] 3. In the technical scheme of the present application, the human force pressing chamber is responsible for communication with the vehicle rear wheel brake oil circuit through the first oil outlet and the CSV normally open valve. The simulator chamber can selectively communicate with the oil canister or the brake oil circuit of the remaining wheel ends of the vehicle through the second oil outlet and the two-position three-way valve. This architecture cooperates with the valve control strategy to enable the system to use the human force pressing chamber and the simulator chamber as two independent pressure sources to output brake force to the rear wheels and the front wheels (or other wheel ends) respectively in the backup assist (such as mechanical backup or power failure) working condition, thereby realizing four-wheel braking and improving the braking efficiency and vehicle stability in the backup working condition.

[0016] 4. The simulator mechanism in the technical solution of the application adopts a composite elastic body assembly composed of an inner spring, an outer spring, a spring support seat, a rubber elastic body and a rubber elastic body support framework. The spring support seat and the simulator piston are in a split structure, serving as an independent force transmission medium to ensure that the forces of the inner and outer springs are combined first and then transmitted to the rubber elastic body stably and uniformly. This specific multi-layer combined design based on the split support seat can jointly shape an excellent pedal force feeling of "soft first and hard later" and clear and linear feedback through the different stiffness characteristics of the elements and the nonlinear deformation of the rubber elastic body, thereby providing the driver with a comfortable and real brake foot feeling. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The structural composition schematic diagram of the semi-decoupling series wet pedal simulator provided by the technical solution of the application is shown in the figure. Figure 2 The symbol schematic diagram of the two-position three-way electromagnetic valve is shown in the figure. Figure 3 The structural and working principle schematic diagram of the two-position three-way electromagnetic valve is shown in the figure.

[0019] Among them, 1 represents a human force building pressure chamber push rod, 2 represents a human force building pressure chamber piston, 3 represents a secondary sealing element, 4 represents a primary sealing element, 5 represents a human force building unit spring, 6 represents a human force building chamber, 7 represents a simulator chamber, 8 represents an inner spring, 9 represents an outer spring, 10 represents an inner spring support seat, 11 represents a rubber elastic body, 12 represents a rubber elastic body support framework, 13 represents a simulator cover, and 14 represents a simulator piston. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] It should be noted that the terms in the embodiments of the present application and the drawings include and have as well as any variations thereof, which are intended to cover non-exclusive inclusion.

[0022] The embodiment of the present specification discloses a semi-decoupling series wet pedal simulator and a vehicle brake control system, which will be described in detail below in combination with the drawings. Among them, Figure 1 The semi-decoupling series wet pedal simulator provided by the technical scheme of the present application is shown in the structural composition diagram, Figure 2 is a symbol diagram of a two-position three-way electromagnetic valve, Figure 3 is a structural and working principle diagram of a two-position three-way electromagnetic valve.

[0023] As Figure 1 shown, the semi-decoupling series wet pedal simulator provided by the technical scheme of the present application comprises: An aluminum valve body, two coaxial cavities arranged in series are arranged inside the aluminum valve body along the axial direction, which are simulator cavity 7 located on the left side and human power pressure cavity 6 located on the right side, the two cavities are separated by an intermediate partition plate, a plurality of through holes for transmitting hydraulic pressure are arranged on the intermediate partition plate; A human power pressure mechanism is assembled in the human power pressure cavity 6, which comprises a human power pressure cavity push rod 1, a human power pressure cavity piston 2, a secondary sealing element 3, a primary sealing element 4 and a human power pressure unit spring 5, the human power pressure cavity push rod 1 penetrates the right end cover of the aluminum valve body along the axial direction, the human power pressure cavity piston 2 is connected with the left end of the human power pressure cavity push rod 1, the secondary sealing element 3 and the primary sealing element 4 are arranged on the two sides of the human power pressure cavity piston 2 respectively, and the human power pressure unit spring 5 is arranged in the human power pressure cavity 6; The human power pressure cavity 6 is provided with a first oil outlet, the first oil outlet is connected with a CSV normally open valve, and the CSV normally open valve is in communication with a vehicle rear wheel brake oil circuit; A simulator mechanism is assembled in the simulator cavity 7, which comprises a simulator piston 14, a guide rod, an elastomer assembly and a simulator cover 13, the simulator piston 14 is slidably assembled in the simulator cavity 7, the guide rod is arranged at the right end of the simulator piston 14 and extends into the human power pressure cavity 6 through the through hole on the intermediate partition plate, and a predetermined initial gap is maintained between the human power pressure cavity piston 2, the elastomer assembly is arranged on the left side of the simulator piston 14, and the simulator cover 13 is fixedly connected to the left end of the aluminum valve body; The elastic body assembly comprises an inner spring 8 and an outer spring 9 coaxially sleeved from inside to outside, a spring support seat 10, a rubber elastic body 11 and a rubber elastic body support framework 12; the right ends of the inner spring 8 and the outer spring 9 are in contact with the left end of the simulator piston 14, and the left ends are in contact with the right end surface of the spring support seat 10; the left end surface of the spring support seat 10 is in contact with the right end of the rubber elastic body 11; the left end of the rubber elastic body 11 is supported by the rubber elastic body support framework 12; the rubber elastic body support framework 12 is supported on the simulator cover 13; the outer spring 9 is sleeved outside the inner spring 8; The simulator cavity 7 is provided with a second oil outlet, and a two-position three-way valve is connected to the second oil outlet, which selectively communicates with an oil can or a remaining wheel end brake oil circuit of the vehicle.

[0024] The working principle of the above-mentioned pedal simulator provided in the present application is described as follows: in a conventional brake assist working condition, the driver steps on the brake pedal to push the manual force compression cavity push rod 1 and the manual force compression cavity piston 2 connected thereto to move left. At this time, the CSV normally open valve is closed by power supply, cutting off the direct communication between the manual force compression cavity 6 and the rear wheel brake oil circuit. Therefore, the brake hydraulic pressure generated in the manual force compression cavity forces the brake fluid to pass through a plurality of through holes on the intermediate partition plate, enter the simulator cavity 7 on the left, and push the simulator piston 14 to move left. The simulator piston 14 in turn compresses the elastic body assembly on its left, which is compressed first by the coaxially sleeved inner spring 8 and outer spring 9, and the force is integrated by the spring support seat 10 and then transmitted to the rubber elastic body 11, so that the rubber elastic body 11 is deformed. In this process, the two-position three-way valve is in a position to communicate the simulator cavity 7 with the oil can, allowing part of the liquid in the cavity to flow. The nonlinear reaction force generated when the elastic body assembly comprising the inner spring, the outer spring and the rubber elastic body is compressed is finally fed back to the driver through hydraulic and mechanical transmission, thereby simulating the required brake pedal feeling. At the same time, since there is a preset initial gap between the guide rod and the manual force compression cavity piston 2, the two do not mechanically contact during the conventional braking process, realizing the decoupling of movement.

[0025] In the backup assist such as mechanical backup or power-off condition, the system state changes. The CSV normally open valve opens due to power-off, so that the human power build-up chamber 6 can be directly communicated with the vehicle rear wheel brake oil circuit through the first oil outlet. At the same time, the two-position three-way valve switches to the position of communicating the simulator chamber 7 with the vehicle remaining wheel end such as the front wheel brake oil circuit. At this time, if the driver steps on the pedal, the pressure directly established by the human power build-up chamber piston 2 can be delivered to the rear wheel through the CSV valve. In addition, if the human power build-up chamber cannot be pressurized due to leakage, the piston 2 will contact the guide rod by crossing the initial gap under the action of the push rod, and the pressure in the simulator chamber 7 is established by mechanically pushing the simulator piston 14, which is delivered to the front wheel or other wheel end through the two-position three-way valve, thereby realizing four-wheel braking and providing redundant backup capability, so as to ensure the basic braking efficiency and stability of the vehicle in the power failure condition.

[0026] Based on the foregoing technical solutions, some specific embodiments are further provided in the embodiments of the present specification, which are described below respectively.

[0027] In the optional embodiment technical solution, the simulator cover 13 is fixedly connected to the left end of the aluminum valve body by riveting or threaded connection.

[0028] In the embodiment technical solution, the simulator cover 13 is fixedly connected to the left end of the aluminum valve body by riveting or threaded connection. This connection mode can ensure the firm combination between the simulator cover and the aluminum valve body, thereby guaranteeing the sealing performance and structural integrity of the simulator chamber. The riveting or threaded connection mode can withstand the hydraulic pressure fluctuation in the simulator and the reaction force generated by the elastomer assembly, preventing loosening or leakage during braking.

[0029] In the optional embodiment technical solution, the CSV normally open valve is closed in the power-on state and opened in the power-off state.

[0030] In the embodiment technical solution, the CSV normally open valve is configured to be closed in the power-on state and opened in the power-off state.

[0031] Specifically, in the conventional power-assisted braking condition, the CSV normally open valve remains powered on, and in this power-on state, the valve is closed, so that the direct communication between the first oil outlet of the human power build-up chamber 6 and the vehicle rear wheel brake oil circuit can be cut off, which can make the brake hydraulic pressure generated in the human power build-up chamber unable to directly flow to the wheel end, but be forced to enter the simulator chamber 7 through the through hole on the intermediate partition plate to push the simulator piston and compress the elastomer assembly, thereby providing an accurate pedal feel simulation for the driver.

[0032] In the backup assist working condition (for example, mechanical backup working condition in case of electrical system failure), the CSV normally open valve loses power supply due to system power failure. In this power failure state, the valve returns to the open position based on its "normally open" design characteristics. At this time, the human power pressurizing cavity 6 is restored to communication with the vehicle rear wheel brake oil circuit through the first oil outlet and the opened CSV normally open valve, which can enable the hydraulic pressure established by the human power pressurizing cavity push rod 1 and the piston 2 to be directly transmitted to the rear wheel brake, so as to realize braking of the rear wheel, thereby providing basic braking protection when the assist system fails.

[0033] In an optional embodiment, the two-position three-way valve is in a position communicating the simulator cavity 7 and the wheel end in the power failure state.

[0034] In the embodiment, the two-position three-way valve is in a position communicating the simulator cavity 7 and the wheel end in the power failure state, which directly corresponds to the backup assist working condition (mechanical backup working condition) of the device. When power failure occurs, the two-position three-way valve switches to this position, so that the brake hydraulic pressure in the simulator cavity 7 can be transmitted to the brake oil circuit of the remaining wheel end of the vehicle, rather than being communicated with the oil tank, thereby enabling the simulator cavity 7 to become an additional pressure source in the backup working condition.

[0035] The position setting after power failure in the embodiment can form a double pressure source with the simulator cavity 7 and the human power pressurizing cavity 6 in the mechanical backup scene of the electronic control system failure, and output brake force to different wheel ends, thereby effectively improving the backup braking strength, meeting the functional requirements of the braking system on redundant backup, and ensuring the reliability of the backup working condition without additional electronic control signals, but only relying on the inherent state of the valve after power failure.

[0036] In an optional embodiment, the number of through holes on the intermediate partition plate is 3-6, which are uniformly distributed around the guide rod; a simulator seal is arranged between the simulator piston 14 and the aluminum valve body, for sealing the simulator cavity 7.

[0037] In the embodiment, the number of through holes on the intermediate partition plate is designed to be 3-6, and these through holes are uniformly distributed around the guide rod. The main function of these through holes is to form a hydraulic passage to allow brake fluid to flow between the two cavities to transmit hydraulic pressure. The uniform distribution layout can ensure that the hydraulic pressure acts symmetrically and smoothly on the simulator piston, avoiding the problems of piston eccentric wear or jamming due to uneven pressure, and providing a stable guide environment for the simulator piston guide rod passing therethrough.

[0038] In addition, a simulator seal is arranged between the simulator piston 14 and the aluminum valve body, which functions to ensure the sealing of the simulator cavity 7 and prevent leakage of brake fluid in the cavity.

[0039] In an optional embodiment, the human force pressing unit spring 5 is sleeved on the human force pressing cavity push rod 1, the right end is supported on the right end cover of the aluminum valve body, and the left end is supported on the human force pressing cavity piston 2; the human force pressing cavity piston 2 is fixedly connected with the human force pressing cavity push rod 1 or is in an integral molding structure.

[0040] In the embodiment, the human force pressing unit spring 5 is sleeved on the human force pressing cavity push rod 1, the installation position and support relationship are introduced as follows: the right end of the spring 5 is directly supported on the right end cover of the aluminum valve body, and the left end is supported on the human force pressing cavity piston 2. This arrangement can make the human force pressing unit spring 5 be pre-compressed between the right end cover and the human force pressing cavity piston 2, thereby exerting a continuous rightward reset force on the piston. When the driver releases the brake pedal, the reset action of the spring can push the human force pressing cavity piston 2 to return to its initial position, ensuring that the brake system can quickly and reliably release the braking state and be ready for the next braking operation. The structure of sleeving the spring on the push rod is compact, which can effectively utilize the space inside the valve body.

[0041] In addition, the connection between the human force pressing cavity piston 2 and the human force pressing cavity push rod 1 adopts a fixed connection or an integral molding structure. The fixed connection can be a mechanical connection mode that cannot move relatively, such as threaded fastening and pin connection. This firm connection can ensure that the operation force input from the human force pressing cavity push rod 1 can be directly and efficiently transmitted to the human force pressing cavity piston 2, and there is no invalid stroke or relative displacement between the piston and the push rod, thereby ensuring the accuracy and response speed of force transmission.

[0042] In an optional embodiment, the spring support seat 10 and the simulator piston 14 are in a split structure, and the rubber elastic body support framework 12 and the simulator cover 13 are in a split structure.

[0043] In the embodiment, the spring support seat 10 and the simulator piston 14 adopt a split structure, that is, the spring support seat 10 and the simulator piston 14 are two independent parts manufactured and matched with each other, rather than an indivisible whole. This split design can make the right ends of the inner spring 8 and the outer spring 9 jointly act on the simulator piston 14, and the left ends jointly act on the right side end face of the spring support seat 10. The spring support seat 10, as an independent force transmission medium, can integrate the forces from the two inner and outer springs, and then stably and uniformly transmit the combined force to the right end of the rubber elastic body 11 through the left side end face. This structure can avoid the complex spring action force being directly applied to the simulator piston, which is conducive to the orderly transmission and distribution of force.

[0044] Similarly, the rubber elastic body support skeleton 12 and the simulator cover 13 also adopt a split structure, the rubber elastic body support skeleton 12 is an independent component, and its function is to support the left end of the rubber elastic body 11 and finally transmit the force to the simulator cover 13. This split design can make the rubber elastic body support skeleton 12 optimize the material and structure according to its specific support function, without being limited by the fixing method or overall structure of the simulator cover 13. It decouples the support function of the rubber elastic body from the end sealing function of the valve body, making the support of the rubber elastic body 11 more stable and reliable, and also improving the flexibility and maintainability of the component design.

[0045] In an optional embodiment, the rubber elastic body 11 is in a cylindrical structure.

[0046] In the embodiment, the rubber elastic body 11 is in a cylindrical structure, which has geometric symmetry. This shape can first ensure that it has good compatibility and centring with the inner spring 8, the outer spring 9 and the rubber elastic body support skeleton 12 which are coaxially sleeved, and can be stably accommodated in the annular space defined by these components. When the simulator piston 14 moves to the left under the action of hydraulic pressure and compresses the rubber elastic body 11 through the spring support seat 10, the cylindrical rubber elastic body mainly bears axial compression load. Because its shape is completely symmetrical in each radial direction, it can produce uniform and predictable radial expansion deformation during compression, without the uneven load or unstable deformation caused by asymmetric shape.

[0047] The technical scheme of the application arranges the human power pressure cavity and the simulator cavity coaxially and in series in a single aluminum valve body, replaces the traditional design of human power pressure unit and simulator unit as two separate bodies, and the highly integrated structure can improve the space utilization efficiency, so that the whole pedal simulator has a smaller volume and a more compact structure. Meanwhile, the integrated valve body can reduce the number of parts and the complex connecting pipeline, simplify the assembly process, and reduce the manufacturing cost. Meanwhile, the intermediate partition plate arranged between the two cavities and the plurality of through holes thereon can not only realize the hydraulic path of hydraulic pressure transmission between the two cavities, but also provide a physical channel for the guide rod to pass through. The preset initial gap designed between the guide rod and the human power pressure cavity piston can ensure the decoupling of the movement of the two pistons during normal braking, so that the simulator can independently provide pedal feeling. When the human power pressure cavity fails due to leakage, the gap is eliminated, and the guide rod and the human power pressure cavity piston are in mechanical contact, so that the force of the human power push rod can directly push the simulator piston to build pressure through the guide rod. Thus, when a single cavity leaks, the other cavity can be used to realize mechanical backup braking. The human power pressure cavity is responsible for communication with the rear wheel brake oil circuit of the vehicle through the first oil outlet and the CSV normally open valve. The simulator cavity can selectively communicate with the oil canister or the brake oil circuit of the remaining wheels of the vehicle through the second oil outlet and the two-position three-way valve. This architecture cooperates with the valve control strategy to enable the system to use the human power pressure cavity and the simulator cavity as two independent pressure sources to output brake force to the rear wheels and the front wheels (or other wheel ends) respectively in the backup assist (such as mechanical backup or power failure) working condition, thereby realizing four-wheel braking and improving the braking efficiency and vehicle stability in the backup working condition. Moreover, the simulator mechanism in the technical scheme of the application adopts a composite elastic body assembly composed of an inner spring, an outer spring, a spring support seat, a rubber elastic body and a rubber elastic body support framework. The spring support seat and the simulator piston are in a split structure, which serves as an independent force transmission intermediate to ensure that the forces of the inner and outer springs are combined first and then smoothly and uniformly transmitted to the rubber elastic body. This specific multi-layer combination design based on the split support seat can jointly shape the excellent pedal force feeling of "soft first and hard later" and clear and linear feedback through the different stiffness characteristics of each element and the nonlinear deformation of the rubber elastic body, thereby providing the driver with comfortable and realistic brake foot feeling.

[0048] The above merely describes specific embodiments of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

[0049] Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. It is not necessary or possible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A semi-decoupled series wet pedal simulator, characterized in that, include: An aluminum valve body has two coaxially connected cavities inside, namely a simulator cavity (7) on the left and a manual pressure-building cavity (6) on the right. The two cavities are separated by an intermediate partition plate, which has multiple through holes for transmitting hydraulic force. The manual pressure building mechanism is assembled in the manual pressure building chamber (6) and includes a manual pressure building chamber push rod (1), a manual pressure building chamber piston (2), a secondary seal (3), a main seal (4), and a manual pressure building unit spring (5). The manual pressure building chamber push rod (1) passes through the right end cover of the aluminum valve body along the axial direction. The manual pressure building chamber piston (2) is connected to the left end of the manual pressure building chamber push rod (1). The secondary seal (3) and the main seal (4) are respectively arranged on both sides of the manual pressure building chamber piston (2). The manual pressure building unit spring (5) is arranged in the manual pressure building chamber (6). The manual pressure chamber (6) is provided with a first oil outlet, and the first oil outlet is connected to a CSV normally open valve, which is connected to the vehicle's rear wheel brake oil circuit. The simulator mechanism is assembled in the simulator cavity (7) and includes a simulator piston (14), a guide rod, an elastomer assembly and a simulator cover (13). The simulator piston (14) is slidably assembled in the simulator cavity (7). The guide rod is located at the right end of the simulator piston (14) and extends through the through hole in the intermediate partition plate to the artificial pressure chamber (6), maintaining a preset initial gap with the artificial pressure chamber piston (2). The elastomer assembly is located on the left side of the simulator piston (14). The simulator cover (13) is fixedly connected to the left end of the aluminum valve body. The elastomer assembly includes an inner spring (8) and an outer spring (9) coaxially sleeved from the inside out, a spring support seat (10), a rubber elastomer (11), and a rubber elastomer support frame (12); the right ends of the inner spring (8) and the outer spring (9) are in contact with the left end of the simulator piston (14), and the left ends of the outer spring (9) are in contact with the right end face of the spring support seat (10); the left end face of the spring support seat (10) is in contact with the right end of the rubber elastomer (11); the left end of the rubber elastomer (11) is supported by the rubber elastomer support frame (12); the rubber elastomer support frame (12) is supported on the simulator cover (13); the outer spring (9) is sleeved outside the inner spring (8); The simulator cavity (7) is provided with a second oil outlet, which is connected to a two-position three-way valve. The two-position three-way valve is selectively connected to the oil reservoir or the brake oil circuit of the other wheel ends of the vehicle.

2. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The simulator cover (13) is fixedly connected to the left end of the aluminum valve body by riveting or threaded connection.

3. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The normally open CSV valve is closed when energized and open when de-energized.

4. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The two-position three-way valve is in the position of connecting the simulator cavity (7) and the wheel end when the power is off.

5. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The intermediate partition plate has 3-6 through holes, which are evenly distributed around the guide rod; a simulator seal is provided between the simulator piston (14) and the aluminum valve body to seal the simulator cavity (7).

6. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The spring (5) of the manual pressure building unit is sleeved on the push rod (1) of the manual pressure building chamber. Its right end is supported on the right end cover of the aluminum valve body, and its left end is supported on the piston (2) of the manual pressure building chamber. The piston (2) of the manual pressure building chamber and the push rod (1) of the manual pressure building chamber are fixedly connected or integrally formed.

7. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The spring support seat (10) and the simulator piston (14) are separate structures; the rubber elastomer support frame (12) and the simulator cover (13) are separate structures.

8. The semi-decoupled series wet pedal simulator according to claim 1, characterized in that, The rubber elastomer (11) has a cylindrical structure.

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