Dynamic calibration mechanism and brake-by-wire system thereof based on force sensor

Abstract

The utility model relates to the field of vehicle brake systems, and discloses a dynamic calibration mechanism and a brake-by-wire system based on a force sensor, the dynamic calibration mechanism comprises a dynamic calibration mechanism body, and a calibration cavity is formed in the dynamic calibration mechanism body. The dynamic calibration mechanism comprises a guide rail, a standard mass block, a telescopic rod, a second pressure sensor and an elastic reset piece. One end of the telescopic rod is connected with an air cylinder for driving the telescopic rod to move axially, and the output end of the telescopic rod extends into the calibration cavity and abuts against the standard mass block; the second pressure sensor is fixedly mounted on the inner wall of the dynamic calibration mechanism body; the elastic reset piece is connected outside the telescopic rod in a sleeved mode, and the two ends of the elastic reset piece are connected with the dynamic calibration mechanism body and the standard mass block respectively. The force sensor is calibrated in real time through the dynamic calibration mechanism, errors caused by long-term use or environmental factors are remarkably reduced, in the braking process, the system can accurately measure the braking force, and it is ensured that an automobile can be braked according to the intention of a driver.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vehicle braking system especially relates to a dynamic calibration mechanism and line control brake system based on force sensor thereof. BACKGROUND

[0002] With the rapid development of automobile industry, as the core component of automobile safety performance, the technical innovation and performance improvement of braking system has been the focus of the industry, and the traditional braking system mainly relies on mechanical structure to realize the braking function, although the technology is mature and widely used, but in the face of growing demand for automobile performance and complex driving environment, its limitations gradually appear, especially in the precise control of braking force and error correction, the traditional braking system often difficult to achieve the desired effect.

[0003] In recent years, with the continuous progress of electronic technology and sensor technology, the line control brake system emerges as the times require, and gradually becomes the mainstream trend of the development of braking system, and the line control brake system realizes the precise adjustment and rapid response of braking force through electronic signal transmission and control, which significantly improves the braking performance and safety of the automobile, and the line control brake system based on force sensor further improves the accurate measurement and real-time feedback of braking force to a new height, however, although the line control brake system based on force sensor has many advantages in theory, in practical application, the long-term stability and accuracy of force sensor become the key factors restricting its performance, force sensor is easily affected by environmental temperature and humidity, mechanical wear and other factors, and error accumulation is easy to occur, which leads to inaccurate measurement of braking force, and further affects the overall performance and safety of the braking system, this problem not only reduces the driving experience, but also may cause potential safety hazards, therefore, in view of the problem that the real-time dynamic calibration mechanism of force sensor is lacked in the prior art, it is difficult to guarantee the long-term stability, especially in the case of emergency braking or complex road conditions, a calibration mechanism is needed to improve. UTILITY MODEL CONTENTS

[0004] The utility model provides a dynamic calibration mechanism and line control brake system based on force sensor thereof in view of the shortcoming in the prior art, to solve the problem that force sensor is easy to cause error accumulation and lead to inaccurate measurement of braking force due to long-term use, environmental factors and sensor characteristics.

[0005] To solve the above technical problems, the utility model solves them by the following technical schemes:

[0006] The dynamic calibration mechanism comprises a dynamic calibration mechanism body, a calibration cavity is formed in the dynamic calibration mechanism body, and the dynamic calibration mechanism comprises a guide rail, a standard mass block, an extension rod, a second pressure sensor and an elastic reset member. The guide rail is fixed in the calibration cavity and extends in the same direction as the power driving direction of the cylinder; the standard mass block is slidingly arranged on the guide rail; one end of the extension rod is connected with a cylinder for driving the axial movement of the extension rod, and the output end of the extension rod extends into the calibration cavity and abuts against the standard mass block; the second pressure sensor is fixedly installed on the inner wall of the dynamic calibration mechanism body near the side of the standard mass block and is located on the movement path of the standard mass block, and is used for collecting the pressure signal applied by the standard mass block and transmitting the pressure signal to a brake controller; and the elastic reset member is sleeved on the extension rod, and the two ends of the elastic reset member are connected with the dynamic calibration mechanism body and the standard mass block respectively. The elastic reset member functions to return the standard mass block to the initial position when the external force of the cylinder is stopped after the deformation in the calibration process, and to maintain the standard mass block at the initial position when the calibration is not started.

[0007] The surface of the brake caliper is fixedly connected with the dynamic calibration mechanism body, and the dynamic calibration mechanism is used for regularly calibrating the first pressure sensor in the brake system to ensure the accuracy of the measurement data. The calibration operation is realized through mechanisms such as the cylinder and the extension rod. The inner wall of the brake caliper is electrically connected with the first pressure sensor, the first pressure sensor is installed in the brake caliper, and the pressure change in the braking process is monitored in real time, and the data is transmitted to the brake controller.

[0008] As a preferred, a guide block is further included, the guide block is connected with the standard mass block or integrally formed, the guide rail is hollow in the middle, and the guide block is clamped in the hollow space of the guide rail to form a limit.

[0009] As a preferred, at least two guide rails are fixed in the calibration cavity, and the upper and lower sides of the standard mass block are matched with the guide rails on the sides through the guide blocks.

[0010] The line control brake system based on the force sensor comprises a dynamic calibration mechanism, and further comprises a brake disc, a brake caliper, a brake controller and a first pressure sensor. The brake caliper is installed on the brake disc, the dynamic calibration mechanism body and the first pressure sensor are integrated on the surface of the brake caliper, the first pressure sensor obtains the piston pressure of the brake caliper and transmits the first pressure signal to the brake controller, the brake controller is in communication connection with the cylinder, the brake controller controls the cylinder to push the standard mass block to slide along the guide rail through the extension rod according to the brake force, and the second pressure sensor collects the pressure and transmits the second pressure signal to the brake controller.

[0011] As a preferred, the brake controller compares the second pressure signal with the first pressure signal in real time, and dynamically corrects the calibration parameters of the first pressure sensor.

[0012] As preferred, the control mechanism is further included, the surface of the brake disc is connected with a rotating speed sensor, the rotating speed sensor is installed on the brake disc and used to acquire the rotating speed of the wheel, one side of the rotating speed sensor is electrically connected with the control mechanism, the control mechanism receives the rotating speed signal from the rotating speed sensor and the first pressure signal from the first pressure sensor, calculates the required braking force according to a preset algorithm, and sends an instruction to the brake controller, and the brake controller adjusts the braking force according to the rotating speed of the wheel.

[0013] As preferred, the cylinder is electrically connected with the brake controller through the lead wire extending out of the body shell of the dynamic calibration mechanism.

[0014] The utility model discloses a dynamic calibration mechanism for brake system, which has the following remarkable technical effects:

[0015] 1. The dynamic calibration mechanism can real-time calibrate the force sensor, significantly reducing the error caused by long-term use or environmental factors. During braking, the system can accurately measure the braking force, ensuring that the vehicle can brake according to the driver's intention.

[0016] 2. The dynamic calibration mechanism not only improves the measurement accuracy of the braking force, but also enhances the stability of the braking system. In complex working conditions such as high-speed driving and emergency braking, the system can quickly respond and accurately adjust the braking force, ensuring the stability and safety of vehicle driving.

[0017] 3. The accurate braking effect and stable braking performance provide better driving experience for the driver. The driver can control the vehicle more confidently, reducing the safety hazards caused by inaccurate braking.

[0018] 4. The design of the dynamic calibration mechanism automates and simplifies the calibration process, reducing manual intervention and maintenance costs. At the same time, through real-time calibration and monitoring, potential problems can be found and solved in time, prolonging the service life of the braking system. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the dynamic calibration mechanism of the utility model;

[0020] Figure 2 is a schematic diagram of the external structure of the dynamic calibration mechanism;

[0021] Figure 3 is a schematic diagram of the cross-sectional structure of the dynamic calibration mechanism;

[0022] Figure 4 is a schematic diagram of the structure of the brake-by-wire system.

[0023] The part names referred to by the numbers in the above drawings are as follows: wherein 1, brake controller; 2, brake caliper; 3, brake disc; 4, dynamic calibration mechanism; 41, calibration cavity; 5, first pressure sensor; 6, rotational speed sensor; 7, control mechanism; 8, wire; 9, air cylinder; 10, telescopic rod; 11, guide rail; 12, guide block; 13, standard mass block; 14, elastic reset member; 15, second pressure sensor. DETAILED DESCRIPTION

[0024] The utility model will be described in further detail below in combination with the drawings and examples.

[0025] Example 1

[0026] A dynamic calibration mechanism, as shown in Figures 1-3 , comprises a dynamic calibration mechanism body 4, a calibration cavity 41 is formed in the dynamic calibration mechanism body 4, and the dynamic calibration mechanism comprises a guide rail 11, a standard mass block 13, a telescopic rod 10, a second pressure sensor 15 and an elastic reset member 14. The guide rail 11 is fixed in the calibration cavity 41, and the extension direction thereof is consistent with the power driving direction of the air cylinder 9; the standard mass block 13 is slidingly arranged on the guide rail 11; one end of the telescopic rod 10 is connected with the air cylinder 9 for driving the axial movement of the telescopic rod 10, and the output end of the telescopic rod 10 extends into the calibration cavity 41 and abuts against the standard mass block 13; the second pressure sensor 15 is fixedly installed on the inner wall of the dynamic calibration mechanism body 4 close to the standard mass block 13 and is located on the movement path of the standard mass block 13, for collecting the pressure signal applied by the standard mass block 13 and transmitting the pressure signal to the brake controller; the elastic reset member 14 is sleeved on the outside of the telescopic rod 10, and the two ends of the elastic reset member 14 are connected with the dynamic calibration mechanism body 4 and the standard mass block 13 respectively. The movable standard mass block moves under the action of the extension of the telescopic rod 10 driven by the air cylinder 9 during the braking process, thereby simulating a known braking force. The elastic reset member 14 can be a spring or other conventional selection of persons skilled in the art.

[0027] The dynamic calibration mechanism further comprises a guide block 12, the guide block 12 is connected with or integrally formed with the standard mass block 13, the guide rail 11 is hollow in the middle, and the guide block 12 is clamped in the hollow space of the guide rail 11 to form a limit.

[0028] In the calibration cavity 41, at least two guide rails 11 are fixed, and the upper and lower sides of the standard mass block 13 are respectively matched with the guide rails 11 on the sides thereof through the guide blocks 12. The upper and lower guide rails 11 are matched with the upper and lower two parts of the guide block 12 or one guide block 12, thereby guiding the standard mass block 13 to perform a guided movement, so that the movement of the standard mass block 13 is more stable.

[0029] A wire-controlled brake system based on a force sensor, as shown in Figure 4As shown, the dynamic calibration mechanism includes a brake disc 3, a brake caliper 2, a brake controller 1 and a first pressure sensor 5, the brake caliper 2 is installed on the brake disc 3, the dynamic calibration mechanism body 4 and the first pressure sensor 5 are integrated on the surface of the brake caliper 2 respectively, the first pressure sensor 5 obtains the piston pressure of the brake caliper 2 and transmits the first pressure signal to the brake controller 1, the brake controller 1 is in communication connection with the air cylinder 9, the brake controller 1 controls the air cylinder 9 to drive the standard mass block 13 to slide along the guide rail 11 through the telescopic rod 10 according to the brake intensity, and the second pressure sensor 15 collects the pressure size and transmits the second pressure signal to the brake controller 1. The brake caliper applies pressure to the brake disc 3 through the piston mechanism to realize the braking effect, the first pressure sensor 5 is also integrated in the brake caliper for real-time monitoring of the brake pressure, the brake disc 3 is connected with the wheel, and the brake caliper applies pressure to it to generate friction force, so as to slow down or stop the rotation of the wheel. This structure is a conventional technical means for persons skilled in the art, and will not be described here.

[0030] The brake controller 1 compares the second pressure signal with the first pressure signal in real time, and dynamically corrects the calibration parameters of the first pressure sensor 5. By comparing the known force generated by the standard mass block with the readings of the second force sensor and the first sensor, the accuracy of the sensor can be evaluated. The system of the brake controller 1 can compare the force generated by the standard mass block 13 with the readings of the second force sensor in real time, and if a difference is found, the calibration of the second sensor will be automatically adjusted to ensure the accuracy of the readings.

[0031] It also includes a control mechanism 7, the surface of the brake disc 3 is connected with a speed sensor 6, the speed sensor 6 is installed on the brake disc 3 and used for obtaining the speed of the wheel, one side of the speed sensor 6 is electrically connected with the control mechanism 7, the control mechanism 7 receives the speed signal from the speed sensor 6 and the first pressure signal from the first pressure sensor 5, calculates the required brake intensity according to a preset algorithm, and sends an instruction to the brake controller 1, and the brake controller 1 adjusts the brake intensity according to the speed of the wheel.

[0032] The air cylinder 9 is electrically connected with the brake controller 1 through the lead wire 8 extending out of the shell of the dynamic calibration mechanism body 4.

[0033] Working principle: during braking, the brake controller 1 receives the braking instruction from the driver and sends an electric signal to the brake caliper 2 through the wire, the brake caliper 2 then applies a braking force to the brake disc 3 and triggers the first pressure sensor 5 to record the size of the braking force. At the same time, the dynamic calibration mechanism body 4 starts to work, the air cylinder 9 receives the instruction from the brake controller 1 to drive the telescopic rod 10 to move, and the movement of the telescopic rod 10 drives the standard mass block 13 abutting with it to slide on the guide rail 11 under the guidance of the guide block.

[0034] In the process of moving the standard mass, the push force given by the elastic return element and the extension rod 10 drives it to generate a known force, which is transmitted to the second pressure sensor 15, which monitors and records the size of the force in real time. Then, the brake controller 1 compares the braking force recorded by the first pressure sensor 5 with the known force recorded by the second pressure sensor 15. If there is a difference between the two, it means that there is an error in the reading of the force sensor. At this time, the system will automatically adjust the calibration parameters of the force sensor according to the size and direction of the difference to reduce the error.

[0035] In this way, the dynamic calibration mechanism body 4 can simulate a known braking force every time the brake is applied and compare it with the reading of the force sensor to calibrate the sensor in real time. This design not only improves the accuracy of the brake system, but also enhances its reliability and stability. Even in the long-term use or in the face of environmental changes, the reading of the force sensor can remain accurate.

[0036] Initial state: Before calibration, the dynamic calibration mechanism body 4 is in standby state, the cylinder 9 and the extension rod 10 are not in action, and the standard mass 13 is kept in the initial position under the action of the elastic return element.

[0037] Calibration start: When the brake controller 1 receives the calibration instruction, it sends a signal to the cylinder 9 through the wire 8, and the cylinder 9 starts to work, pushing the extension rod 10 to extend forward, and the extension rod 10 pushes the standard mass to slide along the guide rail 11, while the elastic return element is elastically deformed. In the process of moving, the standard mass 13 exerts pressure on the second pressure sensor 15, which is collected and transmitted to the brake controller 1 in real time.

[0038] Data comparison and calibration: The brake controller 1 compares the pressure value collected by the second pressure sensor 15 with the preset standard value. If there is a difference between the two, the first pressure sensor 5 is calibrated according to the difference value to ensure the accuracy of the measurement data.

[0039] Calibration completion: After calibration is completed, the cylinder 9 stops working, the extension rod 10 returns to the initial position under the action of the elastic return element, and the standard mass 13 also returns to the initial position. At this time, the dynamic calibration mechanism body 4 is in standby state, waiting for the next calibration instruction.

[0040] In most cases, periodic calibration according to the above steps can ensure the accuracy of the pressure sensor in the brake system. If the measurement data of the first pressure sensor 5 deviates greatly from the standard value during calibration and cannot be restored to normal by calibration adjustment, a new pressure sensor needs to be replaced. In special environments such as high temperature, low temperature or humidity, the performance of the brake system may be affected, so when calibrating in the above environment, special attention should be paid to the adjustment of the calibration parameters to ensure the accuracy of the calibration results.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0042] In summary, the above is only a preferred embodiment of the present application, and any changes and modifications made in accordance with the scope of the patent application of the present application shall be within the scope of the present application.

Claims

1. A dynamic calibration mechanism comprising a dynamic calibration mechanism body (4) in which a calibration cavity (41) is formed, characterized in that, It comprises: a guide rail (11) fixed in the calibration cavity (41), the extension direction of which is consistent with the power driving direction of the cylinder (9); a standard mass block (13) slidingly arranged on the guide rail (11); a telescopic rod (10), one end of which is connected with the cylinder (9) driving the axial movement, and the output end of the telescopic rod (10) extends into the calibration cavity (41) and abuts against the standard mass block (13); a second pressure sensor (15) fixedly installed on the inner wall of the dynamic calibration mechanism body (4) near the side of the standard mass block (13), located on the movement path of the standard mass block (13), used for collecting the pressure signal applied by the standard mass block (13) and transmitting to the brake controller; a resilient reset member (14) sleeved on the outside of the telescopic rod (10), the two ends of the resilient reset member (14) are connected with the dynamic calibration mechanism body (4) and the standard mass block (13) respectively.

2. A dynamic calibration mechanism according to claim 1, characterized in that: It also comprises a guide block (12) connected with or integrally formed with the standard mass block (13), the middle of the guide rail (11) is hollow, and the guide block (12) is clamped in the hollow space of the guide rail (11) to form a limit.

3. A dynamic calibration mechanism as claimed in claim 1, characterized in that: In the calibration cavity (41), at least two guide rails (11) are fixed, and the upper and lower sides of the standard mass block (13) are respectively matched with the guide rails (11) on the sides through the guide blocks (12).

4. A brake-by-wire system based on a force sensor, comprising the dynamic calibration mechanism according to any one of claims 1-3, and further comprising a brake disc (3), a brake caliper (2), a brake controller (1) and a first pressure sensor (5), the brake caliper (2) is installed on the brake disc (3), the dynamic calibration mechanism body (4) and the first pressure sensor (5) are respectively integrated on the surface of the brake caliper (2), the first pressure sensor (5) acquires the piston pressure of the brake caliper (2) and transmits the first pressure signal to the brake controller (1), the brake controller (1) is in communication connection with the cylinder (9), the brake controller (1) controls the cylinder (9) according to the brake intensity to push the standard mass block (13) to slide along the guide rail (11) through the telescopic rod (10), and the second pressure sensor (15) collects the pressure and transmits the second pressure signal to the brake controller (1).

5. The force sensor based brake-by-wire system according to claim 4, characterized in that: The brake controller (1) compares the second pressure signal with the first pressure signal in real time, and dynamically corrects the calibration parameters of the first pressure sensor (5).

6. The force sensor-based brake-by-wire system according to claim 4, characterized in that: It also comprises a control mechanism (7), the surface of the brake disc (3) is connected with a speed sensor (6), the speed sensor (6) is installed on the brake disc (3) and used for acquiring the speed of the wheel, one side of the speed sensor (6) is electrically connected with the control mechanism (7), the control mechanism (7) receives the speed signal from the speed sensor (6) and the first pressure signal from the first pressure sensor (5), calculates the required brake intensity according to a preset algorithm, and sends an instruction to the brake controller (1), and the brake controller (1) adjusts the brake intensity according to the speed of the wheel.

7. The force sensor based brake-by-wire system of claim 4, wherein: The cylinder (9) is electrically connected with the brake controller (1) through the wire (8) extending out of the shell of the dynamic calibration mechanism body (4).

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