A pedal force compensation device, a braking system, and a pedal force compensation method

Abstract

The present application relates to a pedal force compensation device, a braking system and a pedal force compensation method, belonging to the technical field of braking systems, and includes a housing with an accommodation cavity, two pistons, a compensation spring and a first push rod; the pistons are slidably arranged in the accommodation cavity along their axial directions, and the two pistons divide the accommodation cavity into three chambers, and the middle chamber and the right chamber are used for accommodating liquid; the compensation spring is arranged in the left chamber, and its two ends are respectively connected with the left piston and the left inner wall of the housing; one end of the first push rod is connected with the right piston, and the other end extends outside the housing and is connected with the brake pedal; wherein, when the brake pedal is depressed, the right piston is driven by the first push rod to slide in a direction away from the brake pedal, so as to drive the left piston to slide by compressing the middle chamber, so that the compensation spring in the left chamber is compressed and a pedal compensation force is provided. The present application solves the problem of uneven initial pedal force by providing a pedal compensation force for the dead travel stage, so as to improve the initial brake pedal feel.

Description

Technical Field

[0001] This application relates to the technical field of braking systems, and particularly relates to a pedal force compensation device, a braking system, and a pedal force compensation method. Background Art

[0002] With the development of new energy vehicles, more and more vehicles will choose to configure braking systems such as one-box (i.e., intelligent booster) to make the brake pedal and the braking system decoupled. When a vehicle is configured with a one-box braking system, the brake pedal force will be simulated by the master cylinder spring force F1 corresponding to the first large spring of the master cylinder, the system resistance F η , the preset force F0 of the simulator of the pedal, and the simulator spring force. Among them, among the four main components of the brake pedal force, the preset force F0 of the simulator refers to the pre-pressure of the simulator spring in the initial state (at this time, the simulator spring is in a compressed state). The preset force of the simulator must be significantly greater than the master cylinder spring force F1 of the first large spring of the master cylinder and the system resistance F η sum, so as to ensure that the braking system can return smoothly under various working conditions.

[0003] Therefore, when the driver brakes, the first thing to overcome is the master cylinder spring force F1 and the system resistance F η , and then continue to step on the brake pedal downward. When the input force is greater than the preset force F0 of the simulator, the pedal simulator spring begins to be compressed, thereby providing the simulator spring force. Thus, when overcoming the preset force F0 of the simulator, as shown in Figure 1 , since the preset force F0 of the simulator needs to be significantly greater than the sum of the master cylinder spring force F1 and the system resistance F η sum, there will inevitably be a step in the pedal force, that is, when the pedal stroke reaches the dead stroke S0, there will be an obvious sense of step in the braking force, which will further cause the driver to feel that the initial pedal force is not smooth, thus resulting in a poor driving experience. Therefore, how to solve the defect of uneven initial pedal force caused by the fact that the preset force of the simulator needs to be significantly greater than the sum of the master cylinder spring force and the system resistance is an urgent problem to be solved currently. Summary of the Invention

[0004] This application provides a pedal force compensation device, a braking system, and a pedal force compensation method to solve the problem of uneven initial pedal force caused by the fact that the preset force of the simulator needs to be significantly greater than the sum of the master cylinder spring force and the system resistance in the related art.

[0005] In a first aspect, a pedal force compensation device is provided, including:

[0006] A housing, in which a receiving cavity is provided;

[0007] Two pistons, which are slidably arranged along their axial directions in the accommodation cavity. The two pistons divide the accommodation cavity into three chambers. The middle chamber and the right chamber are used to accommodate liquid;

[0008] A compensation spring, which is arranged in the left chamber, and its two ends are respectively fixedly connected to the left piston and the left inner wall of the housing;

[0009] A first push rod, one end of which is fixedly connected to the right piston, and the other end extends outside the housing and is fixedly connected to the brake pedal;

[0010] Wherein, when the brake pedal is depressed, the right piston is driven by the first push rod to slide in a direction away from the brake pedal, so as to drive the left piston to slide by compressing the middle chamber, and the compensation spring in the left chamber is compressed to provide a pedal compensation force.

[0011] On the basis of the above technical solution, when the brake pedal is depressed, the right piston is driven by the first push rod to slide in a direction away from the brake pedal, so as to drive the left piston to slide by compressing the middle chamber, and the compensation spring in the left chamber is compressed to provide a pedal compensation force, including:

[0012] When the brake pedal is depressed and the first real-time stroke of the second push rod is less than or equal to the dead stroke, the second push rod is used to drive the first push rod to slide in a direction away from the brake pedal. The two ends of the second push rod are respectively fixedly connected to the brake pedal and the intelligent booster of the braking system;

[0013] The first push rod is used to drive the right piston to slide in a direction away from the brake pedal and the corresponding first sliding stroke is less than or equal to the preset stroke, so that the volume of the right chamber becomes larger, so as to compress the middle chamber and drive the left piston to slide in a direction away from the brake pedal, so that the compensation spring in the left chamber is compressed to provide a pedal compensation force.

[0014] On the basis of the above technical solution, when the first real-time stroke of the second push rod is equal to the dead stroke and the first sliding stroke of the right piston is equal to the preset stroke, the calculation formula of the pedal compensation force is:

[0015] F2 = (F0 - F1 - F η ) × L2 / L1

[0016] In the formula, F2 represents the pedal compensation force, F0 represents the simulator preset force, F1 represents the master cylinder spring force, F η represents the system resistance, L1 represents the vertical distance between the fixed point of the first push rod and the brake pedal, and L2 represents the vertical distance between the fixed point of the second push rod and the brake pedal.

[0017] Based on the above technical solution, the preset stroke is determined by the idle stroke, the vertical distance between the first push rod and the fixed point of the brake pedal, and the vertical distance between the second push rod and the fixed point of the brake pedal.

[0018] Based on the above technical solution, the device further includes a liquid storage tank, which is communicated with the right chamber for liquid exchange between the two; a liquid exchange channel is provided in the housing for liquid exchange between the right chamber and the middle chamber.

[0019] Based on the above technical solution, when the first sliding stroke of the right piston is greater than the preset stroke, the liquid in the middle chamber flows into the right chamber through the liquid exchange channel, so that the compensated spring compressed in the left chamber returns to its original position and releases the pedal compensation force;

[0020] Before the second sliding stroke corresponding to the sliding of the right piston towards the brake pedal is less than the preset stroke, the liquid storage tank is used to continuously supply liquid to the right chamber.

[0021] Based on the above technical solution, when the brake pedal is released, the second push rod is used to drive the first push rod to slide towards the brake pedal;

[0022] When driving the right piston to slide towards the brake pedal through the first push rod and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber flows into the middle chamber through the liquid exchange channel;

[0023] When the second sliding stroke of the right piston is less than the preset stroke, the liquid in the right chamber is introduced into the liquid storage tank.

[0024] Based on the above technical solution, the liquid is brake fluid.

[0025] In a second aspect, a braking system is provided, including: a pedal force compensation device, an intelligent booster, and a second push rod as described above. The right piston is fixedly connected to the brake pedal through the first push rod, and the intelligent booster is fixedly connected to the brake pedal through the second push rod.

[0026] Based on the above technical solution, when the brake pedal is depressed, driving the right piston to slide away from the brake pedal through the first push rod, so as to drive the left piston to slide by compressing the middle chamber, so that the compensated spring in the left chamber is compressed and provides pedal compensation force, includes:

[0027] When the brake pedal is depressed and the first real-time stroke of the second push rod is less than or equal to the idle stroke, the second push rod is used to drive the first push rod to slide away from the brake pedal. The two ends of the second push rod are respectively fixedly connected to the brake pedal and the intelligent booster of the braking system;

[0028] The first push rod is used to drive the right piston to slide away from the brake pedal, and the corresponding first sliding stroke is less than or equal to the preset stroke, so that the volume of the right chamber becomes larger, compress the middle chamber and drive the left piston to slide away from the brake pedal, so that the compensation spring in the left chamber is compressed and provides a pedal compensation force.

[0029] Based on the above technical solution, when the first real-time stroke of the second push rod is equal to the empty stroke and the first sliding stroke of the right piston is equal to the preset stroke, the calculation formula of the pedal compensation force is:

[0030] F2 = (F0 - F1 - F η ) × L2 / L1

[0031] In the formula, F2 represents the pedal compensation force, F0 represents the simulator preset force, F1 represents the master cylinder spring force, F η represents the system resistance, L1 represents the vertical distance between the fixed point of the first push rod and the brake pedal, and L2 represents the vertical distance between the fixed point of the second push rod and the brake pedal.

[0032] Based on the above technical solution, the preset stroke is determined by the empty stroke, the vertical distance between the fixed point of the first push rod and the brake pedal, and the vertical distance between the fixed point of the second push rod and the brake pedal.

[0033] Based on the above technical solution, the device further includes a liquid storage tank, which is communicated with the right chamber for liquid exchange between the two; a liquid exchange channel is provided in the housing for liquid exchange between the right chamber and the middle chamber.

[0034] Based on the above technical solution, when the first sliding stroke of the right piston is greater than the preset stroke, the liquid in the middle chamber flows into the right chamber through the liquid exchange channel, so that the compressed compensation spring in the left chamber returns to its original position and releases the pedal compensation force;

[0035] Before the second sliding stroke corresponding to the right piston sliding towards the brake pedal is less than the preset stroke, the liquid storage tank is used to continuously supply liquid to the right chamber.

[0036] Based on the above technical solution, when the brake pedal is released, the second push rod is used to drive the first push rod to slide towards the brake pedal;

[0037] When driving the right piston to slide towards the brake pedal through the first push rod and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber flows into the middle chamber through the liquid exchange channel;

[0038] When the second sliding stroke of the right piston is less than the preset stroke, the liquid in the right chamber is introduced into the liquid storage tank.

[0039] On the basis of the above technical solution, the liquid is brake fluid.

[0040] In a third aspect, a pedal force compensation method using the aforementioned pedal force compensation device is provided, including the following steps:

[0041] When the brake pedal is depressed, the first push rod drives the right piston to slide away from the brake pedal;

[0042] By sliding the right piston to compress the intermediate chamber, the left piston is driven to slide so that the compensation spring in the left chamber is compressed and a pedal compensation force is provided.

[0043] On the basis of the above technical solution, when the brake pedal is depressed, the first push rod drives the right piston to slide away from the brake pedal, including:

[0044] When the brake pedal is depressed and the first real-time stroke of the second push rod is less than or equal to the dead stroke, the second push rod drives the first push rod to slide away from the brake pedal, and both ends of the second push rod are fixedly connected to the brake pedal and the intelligent booster of the braking system;

[0045] The first push rod drives the right piston to slide away from the brake pedal;

[0046] On the basis of the above technical solution, by sliding the right piston to compress the intermediate chamber, the left piston is driven to slide so that the compensation spring in the left chamber is compressed and a pedal compensation force is provided, including:

[0047] When the first sliding stroke of the right piston sliding away from the brake pedal is less than or equal to the preset stroke, the volume of the right chamber becomes larger, so as to compress the intermediate chamber and drive the left piston to slide away from the brake pedal, so that the compensation spring in the left chamber is compressed and a pedal compensation force is provided.

[0048] On the basis of the above technical solution, when the first real-time stroke of the second push rod is equal to the dead stroke and the first sliding stroke of the right piston is equal to the preset stroke, the calculation formula of the pedal compensation force is:

[0049] F2 = (F0 - F1 - F η ) × L2 / L1

[0050] In the formula, F2 represents the pedal compensation force, F0 represents the simulator preset force, F1 represents the master cylinder spring force, F ηIt represents the system resistance. L1 represents the vertical distance between the first push rod and the fixed point of the brake pedal, and L2 represents the vertical distance between the second push rod and the fixed point of the brake pedal.

[0051] Based on the above technical solution, the preset stroke is determined by the dead stroke, the vertical distance between the first push rod and the fixed point of the brake pedal, and the vertical distance between the second push rod and the fixed point of the brake pedal.

[0052] Based on the above technical solution, the method further includes: realizing the liquid exchange between the liquid storage tank and the right chamber; realizing the liquid exchange between the right chamber and the middle chamber through the liquid exchange channel in the housing.

[0053] Based on the above technical solution, when the first sliding stroke of the right piston is greater than the preset stroke, the liquid in the middle chamber flows into the right chamber through the liquid exchange channel, so that the compressed compensation spring in the left chamber returns to its original position and releases the pedal compensation force;

[0054] Before the second sliding stroke corresponding to the right piston sliding towards the brake pedal is less than the preset stroke, the liquid storage tank continuously supplies liquid to the right chamber.

[0055] Based on the above technical solution, when the brake pedal is released, the second push rod drives the first push rod to slide towards the brake pedal;

[0056] When driving the right piston to slide towards the brake pedal through the first push rod and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber flows into the middle chamber through the liquid exchange channel;

[0057] When the second sliding stroke of the right piston is less than the preset stroke, the liquid in the right chamber is introduced into the liquid storage tank.

[0058] Based on the above technical solution, the liquid is brake fluid.

[0059] The beneficial effects brought by the technical solution provided by this application include: it can effectively improve the problem of uneven pedal force in the initial stage to enhance the initial brake pedal feel.

[0060] The present application provides a pedal force compensation device, a braking system and a pedal force compensation method, including a housing, in which an accommodation cavity is provided; two pistons, the pistons are slidably arranged in the accommodation cavity along their axial directions, the two pistons divide the accommodation cavity into three chambers, the middle chamber and the right chamber are used for accommodating liquid; a compensation spring, the compensation spring is arranged in the left chamber, and its two ends are respectively fixedly connected with the left piston and the left inner wall of the housing; a first push rod, one end of the first push rod is fixedly connected with the right piston, and the other end extends outside the housing and is fixedly connected with the brake pedal; wherein, when the brake pedal is depressed, the right piston is driven by the first push rod to slide in a direction away from the brake pedal, so as to drive the left piston to slide by compressing the middle chamber, so that the compensation spring in the left chamber is compressed and a pedal compensation force is provided. The present application solves the problem of uneven initial pedal force by providing a pedal compensation force during the dead travel stage, so as to improve the initial brake pedal feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0062] Figure 1 It is a schematic diagram of the braking force curve in the prior art;

[0063] Figure 2 It is a schematic structural diagram of a pedal force compensation device provided by an embodiment of the present application;

[0064] Figure 3 It is a schematic flow chart of a pedal force compensation method provided by an embodiment of the present application.

[0065] In the figure: 1 - housing, 11 - accommodation cavity, 111 - right chamber, 112 - middle chamber, 113 - left chamber, 12 - liquid exchange channel, 121 - first oil hole, 122 - second oil hole, 13 - ventilation hole, 2 - first push rod, 3 - right piston, 4 - left piston, 5 - compensation spring, 6 - liquid storage tank, 7 - brake pedal, 71 - brake pedal fixing point, 8 - second push rod, 9 - master cylinder, 10 - simulator spring, Z1 - pedal force compensation device, X1 - intelligent booster. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0067] The embodiments of this application provide a pedal force compensation device, a braking system, and a pedal force compensation method, which can solve the problem of uneven initial-stage pedal force in related technologies because the preset force of the simulator needs to be significantly greater than the sum of the master cylinder spring force and the system resistance.

[0068] To achieve the above objective, the general idea of this application is as follows:

[0069] A pedal force compensation device, the device includes:

[0070] A housing 1, and a receiving cavity 11 is provided in the housing 1;

[0071] Two pistons, the pistons are slidably arranged in the receiving cavity 11 along their axial directions, and the two pistons divide the receiving cavity 11 into three chambers. The middle chamber 112 and the right chamber 111 are used to hold liquid;

[0072] A compensation spring 5, the compensation spring 5 is arranged in the left chamber 113, and its two ends are respectively fixedly connected to the left piston 4 and the left inner wall of the housing 1;

[0073] A first push rod 2, one end of the first push rod 2 is fixedly connected to the right piston 3, and the other end extends outside the housing 1 and is fixedly connected to the brake pedal 7;

[0074] Wherein, when the brake pedal 7 is depressed, the right piston 3 is driven by the first push rod 2 to slide in a direction away from the brake pedal 7, so as to drive the left piston 4 to slide by compressing the middle chamber 112, so that the compensation spring 5 in the left chamber 113 is compressed and a pedal compensation force is provided.

[0075] The following further elaborates on the embodiments of this application with reference to the accompanying drawings.

[0076] See Figure 2 As shown, the embodiments of this application provide a pedal force compensation device, including a housing 1, two pistons (i.e., Figure 2The right piston 3 and the left piston 4 therein, and the initial position of the right piston 3 is at the starting point of the preset stroke S1, that is, the side of the right piston 3 connected to the first push rod 2 is on the same horizontal line as the starting point of the preset stroke S1), a compensation spring 5, and a first push rod 2; wherein, an accommodation cavity 11 is provided in the housing 1, the housing 1 can preferably be a plunger body, and the housing 1 can preferably be fixed on the firewall; each piston is slidably arranged in the accommodation cavity 11 along its axial direction, and the two pistons divide the accommodation cavity 11 into three chambers (that is Figure 2 the left chamber 113, the middle chamber 112, and the right chamber 111 therein); wherein, the left chamber 113 is mainly used to accommodate the compensation spring 5, and a vent hole 13 can be provided on the part of the housing 1 where the left chamber 113 is located, and the vent hole 13 communicates with the left chamber 113 to prevent the air in the left chamber 113 from being compressed when the compensation spring 5 is compressed; while the middle chamber 112 and the right chamber 111 are mainly used to accommodate liquid, and the liquid can preferably be brake fluid to prevent the housing 1 and the pistons from being rusted. It should be understood that since the pistons can slide along their axial directions in the accommodation cavity 11, the volumes of the three chambers will change according to the sliding of the two pistons, that is, the volumes of the three chambers are not fixed and will change according to the positions of the pistons.

[0077] The compensation spring 5 is arranged in the left chamber 113, and its two ends are respectively fixedly connected to the left piston 4 and the left inner wall of the housing 1. It can be understood that when the position of the left piston 4 changes, the volume of the left chamber 113 changes immediately, and at the same time, the compensation spring 5 is compressed or returned by the sliding of the left piston 4, so as to provide a corresponding pedal compensation force or release a corresponding pedal compensation force.

[0078] One end of the first push rod 2 is fixedly connected to the right piston 3, and the other end extends outside the housing 1 and is fixedly connected to the brake pedal 7; the sliding of the right piston 3 is driven by the stroke change of the first push rod 2, so that the volumes of the right chamber 111 and the middle chamber 112 change and liquid exchange occurs. Since the liquid in the middle chamber 112 is not easily compressed, the spaces of the middle chamber 112 and the left chamber 113 will be compressed as a whole, that is, the liquid in the middle chamber 112 is pushed by the right piston 3 to flow towards the left piston 4, thereby driving the left piston 4 to slide, so that the compensation spring 5 is compressed or returned.

[0079] Among them, when the brake pedal 7 is depressed, the first push rod 2 drives the right piston 3 to slide away from the brake pedal 7, so as to compress the space of the intermediate chamber 112, causing the liquid in the intermediate chamber 112 to flow to the left, and then driving the left piston 4 to slide, so that the compensation spring 5 in the left chamber 113 is compressed and provides a pedal compensation force. Specifically, when the brake pedal 7 is depressed, the first push rod 2 will move to the left (i.e., away from the brake pedal 7), and at the same time drive the right piston 3 to slide to the left. At this time, the volume of the right chamber 111 increases, causing the space of the intermediate chamber 112 to be compressed, so as to drive the left piston 4 to also slide to the left. As a result, while the volume of the left chamber 113 decreases, the compensation spring 5 connected to the left piston 4 is compressed, thereby providing a pedal compensation force to solve the problem of uneven initial pedal force, and effectively improving the feel of the initial stage of the brake pedal 7.

[0080] Furthermore, the device further includes a liquid storage tank 6, which is communicated with the right chamber 111 for liquid exchange between the two; a liquid exchange channel 12 is provided in the housing 1 for liquid exchange between the right chamber 111 and the intermediate chamber 112.

[0081] Exemplarily, it should be understood that during the process of the compensation spring 5 providing or releasing the pedal compensation force through the movement of the first push rod 2, the right piston 3 and the left piston 4, the liquid in the right chamber 111 and the intermediate chamber 112 will also be exchanged. At this time, the liquid exchange can be carried out through the liquid exchange channel 12 provided in the housing 1. Among them, see Figure 2 As shown, the structure of the liquid exchange channel 12 can be formed by providing two oil holes (i.e., the first oil hole 121 and the second oil hole 122) in the housing 1 and a hollow channel communicating with the two oil holes, so that when the first push rod 2 pushes the right piston 3 to slide between the two oil holes, the liquid in the right chamber 111 and the liquid in the intermediate chamber 112 can be exchanged through the two oil holes. It should be noted that the structure of the liquid exchange channel 12 can also be set according to actual needs, as long as the liquid exchange between the two chambers can be realized, and it is not limited here.

[0082] At the same time, see Figure 2As shown, a liquid storage tank 6 can also be provided on the side of the right chamber 111. The liquid storage tank 6 is preferably a brake fluid reservoir, and the liquid storage tank 6 is respectively communicated with the right chamber 111 and the atmosphere. The liquid storage tank 6 can not only prevent the air in the right chamber 111 from being compressed during the process of the compensation spring 5 providing or releasing the pedal compensation force through the movement of the first push rod 2, the right piston 3 and the left piston 4, but also provide liquid for the right chamber 111 and recover the liquid in the right chamber 111, that is, realize the liquid exchange between the liquid storage tank 6 and the right chamber 111. It should be noted that the liquid storage tank 6 may not be provided, but a ventilation hole may be directly provided in the right chamber 111 to communicate with the atmosphere through the ventilation hole, so as to prevent the air in the right chamber 111 from being compressed during the process of the compensation spring 5 providing or releasing the pedal compensation force through the movement of the first push rod 2, the right piston 3 and the left piston 4. However, the initial liquid volumes in the right chamber 111 and the intermediate chamber 112 need to be determined according to actual requirements to ensure that the two chambers can normally perform liquid exchange.

[0083] Further, when the brake pedal 7 is depressed, the first push rod 2 drives the right piston 3 to slide away from the brake pedal 7, so as to drive the left piston 4 to slide by compressing the intermediate chamber 112, so that the compensation spring 5 in the left chamber 113 is compressed and the pedal compensation force is provided, including:

[0084] When the brake pedal 7 is depressed and the first real-time stroke of the second push rod 8 is less than or equal to the dead stroke, the second push rod 8 is used to drive the first push rod 2 to slide away from the brake pedal 7. The two ends of the second push rod 8 are respectively fixedly connected to the brake pedal 7 and the intelligent booster of the braking system;

[0085] The first push rod 2 is used to drive the right piston 3 to slide away from the brake pedal 7 and the corresponding first sliding stroke is less than or equal to the preset stroke, so that the volume of the right chamber 111 becomes larger, so as to compress the intermediate chamber 112 and drive the left piston 4 to slide away from the brake pedal 7, so that the compensation spring 5 in the left chamber 113 is compressed and the pedal compensation force is provided.

[0086] Exemplarily, it should be understood that since the intelligent booster (i.e., one-box) has a problem of uneven initial pedal force when providing the simulated brake pedal 7 force because the simulator preset force needs to be significantly greater than the sum of the master cylinder spring force and the system resistance, in order to solve this problem, the present embodiment will provide the pedal compensation force through the pedal force compensation device. Specifically, the pedal force compensation device in the present embodiment controls the compression of the compensation spring 5 to provide the pedal compensation force through the relative movement between the first push rod 2, the brake pedal 7 and the second push rod 8 and the principle that the liquid in the chamber is not easily compressed.

[0087] When the brake pedal 7 is depressed, the second push rod 8 fixedly connected to the brake pedal 7 and one end of the brake master cylinder 9 of the one-box will be driven to move to the left, and the movement of the second push rod 8 will also drive the first push rod 2 to move to the left; when the real-time stroke of the second push rod 8 is less than or equal to the empty stroke (i.e., Figure 1 S0 in), due to the fact that the preset force of the simulator needs to be significantly greater than the sum of the master cylinder spring force and the system resistance, the initial pedal force is not smooth. At this time, the first push rod 2 can be moved to the left to drive the right piston 3 to slide to the left, so that while the volume of the right chamber 111 is continuously increasing, the middle chamber 112 is continuously compressed. Since the liquid in the middle chamber 112 is not easily compressed, the liquid will continuously flow to the left, so that the left piston 4 is pushed to slide to the left, and then the compensation spring 5 in the left chamber 113 is compressed to provide a pedal compensation force to eliminate the problem of uneven initial pedal force.

[0088] However, once the sliding stroke of the right piston 3 is greater than the preset stroke (i.e., the real-time stroke of the second push rod 8 is greater than the empty stroke), it means that the one-box can already provide the simulated brake pedal 7 force normally, that is, there is no problem of uneven initial pedal force. At this time, there is no need to provide a pedal compensation force anymore. Therefore, the compensation spring 5 is no longer compressed but returns to its original position to release the pedal compensation force. It should be noted that the preset stroke S1 will be determined in advance by the empty stroke S0, the vertical distance L1 between the first push rod 2 and the brake pedal fixed point 71, and the vertical distance L2 between the second push rod 8 and the brake pedal fixed point 71, that is, S1 = S0 / L2×L1. Therefore, when the sliding stroke of the right piston 3 sliding to the left is equal to S1, the compensation spring 5 will provide the maximum pedal compensation force.

[0089] Furthermore, when the first real-time stroke of the second push rod 8 is equal to the empty stroke and the first sliding stroke of the right piston 3 is equal to the preset stroke, the calculation formula for the pedal compensation force is:

[0090] F2 = (F0 - F1 - F η )×L2 / L1

[0091] In the formula, F2 represents the pedal compensation force, F0 represents the preset force of the simulator, F1 represents the master cylinder spring force, F η represents the system resistance, L1 represents the vertical distance between the first push rod 2 and the brake pedal fixed point 71, and L2 represents the vertical distance between the second push rod 8 and the brake pedal fixed point 71. Among them, the preset stroke is determined by the empty stroke, the vertical distance between the first push rod 2 and the brake pedal fixed point 71, and the vertical distance between the second push rod 8 and the brake pedal fixed point 71.

[0092] Exemplarily, in this embodiment, it can be understood that when the sliding stroke of the right piston 3 sliding leftward is equal to S1, at this time, the compensation spring 5 will provide the maximum pedal compensation force F2. Among them, substituting the simulator preset force F0, the master cylinder spring force F1, the system resistance F η , the vertical distance L1 between the first push rod 2 and the brake pedal fixing point 71, and the vertical distance L2 between the second push rod 8 and the brake pedal fixing point 71 into the following formula, the maximum pedal compensation force F2 can be calculated:

[0093] F2 = (F0 - F1 - F η ) × L2 / L1

[0094] Furthermore, when the first sliding stroke of the right piston 3 is greater than the preset stroke, the liquid in the intermediate chamber 112 flows into the right chamber 111 through the liquid exchange channel 12, so that the compressed compensation spring 5 in the left chamber 113 returns to its original position and releases the pedal compensation force;

[0095] Before the second sliding stroke corresponding to the right piston 3 sliding towards the brake pedal 7 is less than the preset stroke, the liquid storage tank 6 is used to continuously supply liquid to the right chamber 111.

[0096] Exemplarily, in this embodiment, when the sliding stroke of the right piston 3 sliding leftward is greater than the preset stroke S1, at this time, the liquid in the intermediate chamber 112 flows into the right chamber 111 through the two oil holes of the liquid exchange channel 12, causing the left piston 4 to slide rightward, so as to drive the compressed compensation spring 5 in the left chamber 113 to return to its original position through the sliding of the left piston 4, thereby releasing the pedal compensation force, that is, the pedal compensation force is set to zero; however, before the right piston 3 slides rightward and the sliding stroke is less than or equal to the preset stroke S1 again, the liquid storage tank 6 will continuously supply liquid to the right chamber 111.

[0097] Furthermore, when the brake pedal 7 is released, the second push rod 8 is used to drive the first push rod 2 to slide towards the direction close to the brake pedal 7;

[0098] When driving the right piston 3 to slide towards the direction close to the brake pedal 7 through the first push rod 2 and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber 111 flows into the intermediate chamber 112 through the liquid exchange channel 12;

[0099] When the second sliding stroke of the right piston 3 is less than the preset stroke, the liquid in the right chamber 111 is introduced into the liquid storage tank 6.

[0100] Exemplarily, in this embodiment, when the brake pedal 7 is released, the second push rod 8 will be driven to move to the right, and the movement of the second push rod 8 will also drive the first push rod 2 to move to the right, thereby pushing the right piston 3 to slide to the right; during the process of the right piston 3 sliding to the right, the liquid in the right chamber 111 will continuously flow into the middle chamber 112 through the two oil holes of the liquid exchange channel 12. When the stroke of the first push rod 2 is equal to the preset stroke S1 again, it means that the second oil hole 122 is exactly blocked by the right piston 3, and at this time, the liquid in the right chamber 111 no longer flows into the middle chamber 112; once the stroke of the first push rod 2 is less than the preset stroke S1 again, it means that the space in the right chamber 111 is compressed, and at this time, the liquid in the right chamber 111 will flow into the brake oil pot until the brake pedal 7 is completely released.

[0101] The present application also provides a braking system, including: the aforementioned pedal force compensation device Z1, intelligent booster X1, and second push rod 8. The right piston 3 is fixedly connected to the brake pedal 7 through the first push rod 2, and the intelligent booster X1 is fixedly connected to the brake pedal 7 through the second push rod 8.

[0102] Further, when the brake pedal 7 is depressed, the right piston 3 is driven by the first push rod 2 to slide in a direction away from the brake pedal 7, so as to drive the left piston 4 to slide by compressing the middle chamber 112, and the compensation spring 5 in the left chamber 113 is compressed to provide a pedal compensation force, including:

[0103] When the brake pedal 7 is depressed and the first real-time stroke of the second push rod 8 is less than or equal to the dead stroke, the second push rod 8 is used to drive the first push rod 2 to slide in a direction away from the brake pedal 7. The two ends of the second push rod 8 are respectively fixedly connected to the brake pedal 7 and the intelligent booster X1 of the braking system.

[0104] The first push rod 2 is used to drive the right piston 3 to slide in a direction away from the brake pedal 7, and the corresponding first sliding stroke is less than or equal to the preset stroke, so that the volume of the right chamber 111 becomes larger, so as to compress the middle chamber 112 and drive the left piston 4 to slide in a direction away from the brake pedal 7, so that the compensation spring 5 in the left chamber 113 is compressed to provide a pedal compensation force.

[0105] Further, when the first real-time stroke of the second push rod 8 is equal to the dead stroke and the first sliding stroke of the right piston 3 is equal to the preset stroke, the calculation formula for the pedal compensation force is:

[0106] F2 = (F0 - F1 - F η ) × L2 / L1

[0107] In the formula, F2 represents the pedal compensation force, F0 represents the simulator preset force, F1 represents the master cylinder spring force, F ηIt represents the system resistance, L1 represents the vertical distance between the first push rod 2 and the fixed point 71 of the brake pedal, and L2 represents the vertical distance between the second push rod 8 and the fixed point 71 of the brake pedal.

[0108] Furthermore, the preset stroke is determined by the dead stroke, the vertical distance between the first push rod 2 and the fixed point 71 of the brake pedal, and the vertical distance between the second push rod 8 and the fixed point 71 of the brake pedal.

[0109] Furthermore, the device further includes a liquid storage tank 6 which is communicated with the right chamber 111 for liquid exchange therebetween; a liquid exchange channel 12 is provided in the housing 1 for liquid exchange between the right chamber 111 and the middle chamber 112.

[0110] Furthermore, when the first sliding stroke of the right piston 3 is greater than the preset stroke, the liquid in the middle chamber 112 flows into the right chamber 111 through the liquid exchange channel 12, so that the compensation spring 5 compressed in the left chamber 113 returns to its original position and releases the pedal compensation force;

[0111] Before the second sliding stroke corresponding to the right piston 3 sliding towards the brake pedal 7 is less than the preset stroke, the liquid storage tank 6 is used to continuously supply liquid to the right chamber 111.

[0112] Furthermore, when the brake pedal 7 is released, the second push rod 8 is used to drive the first push rod 2 to slide towards the brake pedal 7;

[0113] When driving the right piston 3 to slide towards the brake pedal 7 through the first push rod 2 and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber 111 flows into the middle chamber 112 through the liquid exchange channel 12;

[0114] When the second sliding stroke of the right piston 3 is less than the preset stroke, the liquid in the right chamber 111 is introduced into the liquid storage tank 6.

[0115] Furthermore, the liquid is brake fluid.

[0116] See Figure 3 As shown, based on the same inventive concept as the device embodiment, the embodiment of the present application also provides a pedal force compensation method implemented by using the aforementioned pedal force compensation device, including:

[0117] Step S10: When the brake pedal 7 is depressed, drive the right piston 3 to slide away from the brake pedal 7 by the first push rod 2;

[0118] Step S20: Compress the intermediate chamber 112 by the sliding of the right piston 3 to drive the left piston 4 to slide, so that the compensation spring 5 in the left chamber 113 is compressed and provides a pedal compensation force.

[0119] Exemplarily, in this embodiment, when the brake pedal 7 is depressed, the first push rod 2 drives the right piston 3 to slide away from the brake pedal 7, so as to compress the space of the intermediate chamber 112, causing the liquid in the intermediate chamber 112 to flow to the left, thereby driving the left piston 4 to slide and compressing the compensation spring 5 in the left chamber 113 to provide a pedal compensation force. Specifically, when the brake pedal 7 is depressed, the first push rod 2 will move to the left (i.e., away from the brake pedal 7), and at the same time drive the right piston 3 to slide to the left. At this time, the volume of the right chamber 111 increases, causing the space of the intermediate chamber 112 to be compressed, driving the left piston 4 to also slide to the left. As a result, while the volume of the left chamber 113 decreases, the compensation spring 5 connected to the left piston 4 is compressed, thereby providing a pedal compensation force to solve the problem of uneven initial pedal force and effectively improving the feel of the initial stage of the brake pedal 7.

[0120] Further, when the brake pedal 7 is depressed, causing the first push rod 2 to drive the right piston 3 to slide away from the brake pedal 7 includes:

[0121] When the brake pedal 7 is depressed and the first real-time stroke of the second push rod 8 is less than or equal to the dead stroke, the second push rod 8 drives the first push rod 2 to slide away from the brake pedal 7. The two ends of the second push rod 8 are respectively fixedly connected to the brake pedal 7 and the intelligent booster of the braking system.

[0122] The first push rod 2 drives the right piston 3 to slide away from the brake pedal 7.

[0123] Further, the process of compressing the intermediate chamber 112 by the sliding of the right piston 3 to drive the left piston 4 to slide, so that the compensation spring 5 in the left chamber 113 is compressed and provides a pedal compensation force includes:

[0124] When the first sliding stroke of the right piston 3 sliding away from the brake pedal 7 is less than or equal to the preset stroke, the volume of the right chamber 111 increases to compress the intermediate chamber 112 and drive the left piston 4 to slide away from the brake pedal 7, so that the compensation spring 5 in the left chamber 113 is compressed and provides a pedal compensation force.

[0125] Further, when the first real-time stroke of the second push rod 8 is equal to the dead stroke and the first sliding stroke of the right piston 3 is equal to the preset stroke, the calculation formula for the pedal compensation force is:

[0126] F2=(F0 - F1 - Fη )×L2 / L1

[0127] Wherein, F2 represents the pedal compensation force, F0 represents the simulator preset force, F1 represents the master cylinder spring force, and F η represents the system resistance, L1 represents the vertical distance between the first push rod 2 and the fixed point 71 of the brake pedal, and L2 represents the vertical distance between the second push rod 8 and the fixed point 71 of the brake pedal.

[0128] Furthermore, the preset stroke is determined by the empty stroke, the vertical distance between the first push rod 2 and the fixed point 71 of the brake pedal, and the vertical distance between the second push rod 8 and the fixed point 71 of the brake pedal.

[0129] Furthermore, the method further includes: realizing the liquid exchange between the liquid storage tank 6 and the right chamber 111; realizing the liquid exchange between the right chamber 111 and the middle chamber 112 through the liquid exchange channel 12 in the housing 1.

[0130] Furthermore, when the first sliding stroke of the right piston 3 is greater than the preset stroke, the liquid in the middle chamber 112 flows into the right chamber 111 through the liquid exchange channel 12, so that the compressed compensation spring 5 in the left chamber 113 returns to its original position and releases the pedal compensation force;

[0131] Before the second sliding stroke corresponding to the sliding of the right piston 3 towards the brake pedal 7 is less than the preset stroke, the liquid storage tank 6 continuously supplies liquid to the right chamber 111.

[0132] Furthermore, when the brake pedal 7 is released, the second push rod 8 drives the first push rod 2 to slide towards the brake pedal 7;

[0133] When the first push rod 2 drives the right piston 3 to slide towards the brake pedal 7 and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber 111 flows into the middle chamber 112 through the liquid exchange channel 12;

[0134] When the second sliding stroke of the right piston 3 is less than the preset stroke, the liquid in the right chamber 111 is fed into the liquid storage tank 6.

[0135] Furthermore, the liquid is brake fluid.

[0136] It should be noted that the step numbers of each step in the embodiments of the present application do not limit the sequence of operations in the technical solutions of the present application.

[0137] The following combines Figure 2 to explain the principle of the pedal force compensation method in this embodiment.

[0138] The general principle is as follows: Preset the preset stroke S1 = S0 / L2×L1 in advance. Then, when the stroke of the second push rod 8 is less than the empty stroke S0, an additional pedal compensation force F2 is added. And when the stroke of the second push rod 8 is equal to S0, F2 = (F0 - F1 - F η )×L2 / L1. When the stroke of the second push rod 8 is greater than S0, the pedal compensation force F2 is set to zero.

[0139] Specifically: When the brake pedal 7 is depressed, the first push rod 2 pushes the right piston 3 to slide leftward. At this time, the brake fluid in the brake fluid reservoir (i.e., the liquid storage tank 6) flows into the right chamber 111 of the housing 1, and the compensation spring 5 fixed in the left chamber 113 is compressed, thereby providing the pedal compensation force F2;

[0140] The first push rod 2 continues to push the right piston 3 to slide leftward. When the stroke of the first push rod 2 is equal to S1 (at this time, the stroke of the second push rod 8 is exactly equal to S0), the pedal compensation force F2 = (F0 - F1 - F η )×L2 / L1;

[0141] The first push rod 2 continues to push the right piston 3 to slide leftward. When the stroke of the first push rod 2 is just greater than S1, the brake fluid in the left chamber 113 sequentially passes through the first oil hole 121 and the second oil hole 122 and enters the right chamber 111. The brake fluid in the brake fluid reservoir continues to flow into the right chamber 111. At this time, the compressed pedal compensation force is released, and the pedal compensation force F2 is set to zero;

[0142] When the brake pedal 7 is released, the second push rod 8 drives the first push rod 2 to move rightward. At this time, the brake fluid in the right chamber 111 sequentially passes through the second oil hole 122 and the first oil hole 121 and flows into the left chamber 113;

[0143] Continue to release the brake pedal 7. When the stroke of the first push rod 2 is equal to S1 again, the second oil hole 122 is blocked. At this time, the brake fluid in the right chamber 111 stops flowing into the left chamber 113;

[0144] Continue to release the brake pedal 7. When the stroke of the first push rod 2 is less than S1 again, the brake fluid in the right chamber 111 flows into the brake fluid reservoir until the pedal is completely released.

[0145] In summary, when a vehicle equipped with a one-box decoupled braking system adopts the technical solution of this embodiment, due to the intervention of the pedal compensation force, there will no longer be an uneven feeling of the pedal force at the initial stage of braking, which significantly improves the initial braking pedal feel, and further greatly improves the overall quality of the vehicle.

[0146] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0147] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0148] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A pedal force compensation device, characterized in that, Comprising: A housing, within which there is a receiving cavity; Two pistons, which are slidably arranged along their axial directions within the receiving cavity. The two pistons divide the receiving cavity into three chambers. The middle chamber and the right chamber are used to hold liquid; A compensation spring, which is arranged within the left chamber, and its two ends are respectively fixedly connected to the left piston and the left inner wall of the housing; A first push rod, one end of which is fixedly connected to the right piston, and the other end extends outside the housing and is fixedly connected to the brake pedal; Wherein, when the brake pedal is depressed, the right piston is driven by the first push rod to slide in a direction away from the brake pedal, so as to drive the left piston to slide by compressing the middle chamber, causing the compensation spring within the left chamber to be compressed and providing a pedal compensation force; Wherein, when the brake pedal is depressed, the right piston is driven by the first push rod to slide in a direction away from the brake pedal, so as to drive the left piston to slide by compressing the middle chamber, causing the compensation spring within the left chamber to be compressed and providing a pedal compensation force, including: When the brake pedal is depressed and the first real-time stroke of the second push rod is less than or equal to the dead stroke, the second push rod is used to drive the first push rod to slide in a direction away from the brake pedal. The two ends of the second push rod are respectively fixedly connected to the brake pedal and the intelligent booster of the braking system; The first push rod is used to drive the right piston to slide in a direction away from the brake pedal and the corresponding first sliding stroke is less than or equal to the preset stroke, so that the volume of the right chamber becomes larger, so as to compress the middle chamber and drive the left piston to slide in a direction away from the brake pedal, causing the compensation spring within the left chamber to be compressed and providing a pedal compensation force; When the first real-time stroke of the second push rod is equal to the dead stroke and the first sliding stroke of the right piston is equal to the preset stroke, the calculation formula for the pedal compensation force is: In the formula, F2 represents the pedal compensation force, F0 represents the simulator preset force, and F1 represents the master cylinder spring force. represents the system resistance, L1 represents the vertical distance between the first push rod and the fixed point of the brake pedal, and L2 represents the vertical distance between the second push rod and the fixed point of the brake pedal. The preset stroke is determined by the dead stroke, the vertical distance between the fixed point of the first push rod and the brake pedal, and the vertical distance between the fixed point of the second push rod and the brake pedal.

2. The pedal force compensation device according to claim 1, characterized in that: The device further includes a liquid storage tank, which is communicated with the right chamber for liquid exchange between the two; a liquid exchange channel is provided within the housing for liquid exchange between the right chamber and the middle chamber.

3. The pedal force compensation device according to claim 2, characterized in that: When the first sliding stroke of the right piston is greater than the preset stroke, the liquid in the middle chamber flows into the right chamber through the liquid exchange channel, so that the compressed compensation spring within the left chamber returns to its original position and releases the pedal compensation force; Before the second sliding stroke corresponding to the right piston sliding in a direction close to the brake pedal is less than the preset stroke, the liquid storage tank is used to continuously supply liquid to the right chamber.

4. The pedal force compensation device according to claim 2, characterized in that: When the brake pedal is released, the second push rod is used to drive the first push rod to slide in a direction close to the brake pedal; When the right piston is driven by the first push rod to slide in a direction close to the brake pedal and the corresponding second sliding stroke is greater than the preset stroke, the liquid in the right chamber flows into the middle chamber through the liquid exchange channel; When the second sliding stroke of the right piston is less than the preset stroke, the liquid in the right chamber flows into the liquid storage tank.

5. The pedal force compensation device according to claim 1, characterized in that: The liquid is brake fluid.

6. A braking system, characterized in that, Comprising: A pedal force compensation device, an intelligent booster and a second push rod according to any one of claims 1 to 5, wherein the right piston is fixedly connected to the brake pedal through a first push rod, and the intelligent booster is fixedly connected to the brake pedal through a second push rod.

7. A pedal force compensation method using the pedal force compensation device according to claim 1, characterized in that, Comprising the following steps: When the brake pedal is depressed, the first push rod drives the right piston to slide away from the brake pedal; The intermediate chamber is compressed by the sliding of the right piston to drive the left piston to slide so that the compensation spring in the left chamber is compressed and a pedal compensation force is provided.

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