Satellite positioning braking performance detector

Abstract

The invention discloses a satellite positioning braking performance detector, belongs to the field of vehicle detection, and aims to realize accurate and dynamic evaluation of vehicle braking performance through real-time interaction of a high-precision satellite positioning technology and a braking signal. The system comprises a starting device, a positioning device and a positioning base station, the starting device comprises a box body and a stroke sensor arranged in the box body, and the stroke sensor can send a first pulse signal after being excited; the positioning device is electrically connected with the starting device and can receive the first pulse signal, the positioning device can also send out a second pulse signal, and the positioning device is configured to be arranged outside the measured vehicle. And the positioning base station is in wireless communication connection with the positioning device and is configured to receive the second pulse signal and perform differential positioning calculation according to the second pulse signal. According to the invention, the real-time association of the brake signal and the high-precision positioning information is realized, the sensitivity of brake triggering is ensured, and the precision of the whole detection is improved through differential positioning calculation.

Description

Technical Field

[0001] This invention relates to the field of vehicle testing technology, specifically to a satellite positioning braking performance tester. Background Technology

[0002] In the field of vehicle braking performance testing, traditional testing methods rely on fixed sites and contact sensors, which suffer from limitations in testing scenarios and insufficient accuracy. In existing technologies, the signal interaction between the positioning device and the braking triggering device is mostly wired, which is cumbersome to install and easily affected by vehicle movement, making it difficult to meet the positioning accuracy requirements for high-precision testing.

[0003] Furthermore, most testing systems suffer from low integration between the initiation and positioning devices, resulting in significant signal transmission delays and an inability to accurately correlate braking actions with vehicle position information, thus affecting the reliability of the test results. Therefore, there is an urgent need for a satellite-based braking performance testing instrument with a simple structure, efficient signal interaction, and high positioning accuracy to address the aforementioned shortcomings of existing technologies. Summary of the Invention

[0004] One objective of this invention is to provide a satellite positioning braking performance tester that, by utilizing a travel sensor to trigger pulse signals and combining differential positioning calculations between a positioning device and a positioning base station, achieves precise correlation between vehicle braking actions and position information, thereby improving the accuracy and efficiency of braking performance testing.

[0005] Another objective of this invention is to provide a satellite positioning braking performance testing method to ensure an orderly and efficient braking testing process.

[0006] The third objective of this invention is to provide a vehicle that integrates brake detection-related devices to improve the convenience of detection.

[0007] Specifically, the present invention provides a satellite positioning braking performance tester, comprising: The starting device includes a housing and a stroke sensor disposed within the housing, wherein the stroke sensor is capable of sending a first pulse signal after being activated; The positioning device is electrically connected to the starting device and is capable of receiving the first pulse signal. The positioning device is also capable of emitting a second pulse signal. The positioning device is configured to be located outside the vehicle being measured.

[0008] The positioning base station is wirelessly connected to the positioning device and is configured to receive the second pulse signal and perform differential positioning calculation based on the second pulse signal.

[0009] Furthermore, the starting device is configured to be installed at the brake pedal of the vehicle being measured, and the stroke sensor is able to sense the action of the brake pedal and generate a corresponding electrical signal. The starting device further includes a signal processing unit, which is capable of converting the electrical signal into the first pulse signal.

[0010] Furthermore, the positioning device includes a satellite positioning antenna, an IMU sensor, and a controller. The satellite positioning antenna and the IMU sensor are both electrically connected to the controller. The controller is configured to trigger the satellite positioning antenna and the IMU sensor to collect vehicle location information based on the first pulse signal, and to generate a second pulse signal containing the location information.

[0011] Furthermore, the positioning device is configured to be located on the top of the vehicle being measured.

[0012] Furthermore, the positioning base station includes a housing, a tripod, a satellite signal receiving module and a communication module disposed within the housing. The housing is mounted on the tripod. The satellite signal receiving module is capable of receiving satellite positioning signals, and the communication module is used to establish a wireless communication connection with the positioning device.

[0013] Furthermore, it also includes a handheld terminal, which is wirelessly connected to both the positioning device and the positioning base station. The handheld terminal can send vehicle parameters to the positioning device and receive differential positioning calculations fed back by the positioning base station.

[0014] Furthermore, it also includes a voice broadcasting device, which is wirelessly connected to the positioning device, and is able to receive voice control signals sent by the positioning device and play corresponding voice prompts according to the voice control signals.

[0015] Specifically, the present invention also provides a satellite positioning braking performance testing method, based on the aforementioned satellite positioning braking performance testing instrument, comprising the following steps: When the starting device is activated, its built-in stroke sensor generates and sends a first pulse signal; The positioning device receives the first pulse signal, generates a second pulse signal, and sends it. The positioning base station receives the second pulse signal and performs differential positioning calculation based on the second pulse signal.

[0016] Furthermore, before the step-starting device is activated and its built-in stroke sensor generates and sends a first pulse signal, the following steps are also included: The positioning device is set at a preset position on the vehicle being measured, the starting device is installed at the vehicle's braking components, and the positioning base station is placed in an open area of ​​the monitoring area. Enable signal interaction between the positioning device and the activation device, between the positioning device and the positioning base station, between the positioning base station and the handheld terminal, and between the positioning device and the handheld terminal, and confirm that the positioning signals of each device are normal; Input vehicle-related information and test control parameters through the operating terminal.

[0017] In particular, the present invention also provides a vehicle comprising: Vehicle body; A starting device is installed at the brake pedal of the vehicle body. The starting device includes a housing and a stroke sensor disposed in the housing. The stroke sensor can send a first pulse signal after being activated. The starting device is electrically connected to a positioning device located outside the vehicle body. The positioning device is able to receive the first pulse signal and emit a second pulse signal. The positioning device is also wirelessly connected to a positioning base station. The positioning base station is able to receive the second pulse signal and perform differential positioning calculation.

[0018] In this invention, the starting device has a built-in stroke sensor that can accurately sense the braking action and generate a first pulse signal. As a detection trigger source, it responds quickly and the signal is stable. It works in conjunction with the positioning device and the positioning base station to realize the real-time correlation between the braking signal and high-precision positioning information, which not only ensures the sensitivity of braking triggering, but also improves the overall detection accuracy through differential positioning calculation.

[0019] In this invention, multi-source complementary acquisition of vehicle location information is achieved through data fusion between satellite positioning antenna and IMU sensor; synchronous sampling of dual sensors is triggered by the first pulse signal, which solves the problem of data loss during high-speed braking of traditional single sensor and fully records the trajectory changes of the entire braking process.

[0020] In this invention, the braking performance testing system is deeply integrated with the vehicle by integrating the starting device into the vehicle body; through the collaboration of the external positioning device and the base station, real-time monitoring of the vehicle's braking performance is achieved without modifying the original vehicle system; this design is particularly suitable for scenarios such as annual inspection of commercial vehicles and road tests of new energy vehicles, transforming braking testing from offline static testing to online dynamic evaluation.

[0021] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0022] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic diagram of a satellite positioning braking performance tester according to one or more embodiments of the present invention; Figure 2 This is a schematic diagram of the installation of the starting device of the satellite positioning braking performance tester according to one or more embodiments of the present invention; Figure 3 This is a schematic diagram of a car and a positioning device according to one or more embodiments of the present invention; Figure 4 This is a schematic diagram of a positioning base station for a satellite positioning braking performance tester according to one or more embodiments of the present invention; Figure 5 This is a flowchart illustrating the steps of a satellite positioning braking performance testing method according to one or more embodiments of the present invention.

[0023] In the picture: 1-Starting device; 100-Brake pedal; 101-Strap; 102-Voice broadcasting device; 2-Positioning device; 200-Vehicle body; 201-Satellite positioning antenna; 3-Positioning base station; 301-Battery; 302-Wire; 303-Magnetic connector; 304-Tripod; 4-Communication satellite; 5-Handheld terminal. Detailed Implementation

[0024] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Please refer to Figures 1-3This embodiment provides a satellite positioning braking performance tester, aiming to achieve accurate and dynamic evaluation of vehicle braking performance through real-time interaction between high-precision satellite positioning technology and braking signals. The system includes a starting device 1, a positioning device 2, and a positioning base station 3. The starting device 1 includes a housing and a stroke sensor housed within the housing. Upon activation, the stroke sensor sends a first pulse signal. The positioning device 2 is electrically connected to the starting device 1 and can receive the first pulse signal. The positioning device 2 can also send a second pulse signal. The positioning device 2 is configured to be located externally to the vehicle being measured. The positioning base station 3 is wirelessly connected to the positioning device 2 and is configured to receive the second pulse signal and perform differential positioning calculations based on the second pulse signal. In this embodiment, the starting device 1 has a built-in stroke sensor that can accurately sense braking action and generate a first pulse signal, providing a rapid and stable response as a detection trigger source. It works in conjunction with the positioning device 2 and the positioning base station 3 to achieve real-time correlation between the braking signal and high-precision positioning information, ensuring both the sensitivity of the braking trigger and improving the overall detection accuracy through differential positioning calculations.

[0027] According to one embodiment of the present invention, the starting device 1 is the triggering component of the system, used to sense the action of the brake pedal 100 and generate a detection signal. The starting device 1 consists of a housing and a built-in high-precision travel sensor. The housing is made of high-strength engineering plastic for easy installation on the vehicle brake pedal 100. The travel sensor is a high-sensitivity inductive sensor that senses the displacement change of the brake pedal 100, and its performance can accurately capture the starting point and force change of the braking action. The housing also integrates a signal processing unit, which uses a microcontroller to convert the analog electrical signal generated by the travel sensor into a digital first pulse signal. To ensure the stability of signal transmission, the signal processing unit has a built-in anti-interference filtering circuit to filter out the influence of vehicle vibration or electromagnetic interference. The starting device 1 is fixed to the brake pedal 100 by Velcro or strap 101 to ensure that it does not shift during high-speed driving or emergency braking. During installation, it is necessary to ensure that the contact surface between the travel sensor and the brake pedal 100 is tightly fitted, and adjust the initial position of the sensor so that it is in the zero position when the brake pedal 100 is not depressed. After installation, the sensor is calibrated using the detection APP on the handheld terminal 5 to ensure the accuracy of the signal output.

[0028] According to one embodiment of the present invention, the positioning device 2 is a core component for achieving high-precision vehicle position acquisition. It is installed on the unobstructed top of the vehicle under test to ensure the quality of satellite signal reception. The positioning device 2 consists of a satellite positioning antenna 201, an inertial measurement unit (IMU) sensor, a controller, and a communication module. The satellite positioning antenna 201 supports BeiDou full-frequency RTK positioning, covering frequency bands such as B1I, B2I, and B3I, meeting the real-time positioning requirements in high-speed driving scenarios. The IMU sensor includes a three-axis accelerometer, a three-axis gyroscope, and a magnetometer, capable of capturing the vehicle's motion state in three-dimensional space. By fusing with RTK positioning data, it compensates for the deficiencies of satellite signals in tunnels or tall building-obstructed environments. The controller uses a microcontroller, integrating data processing algorithms, and is responsible for receiving the first pulse signal and triggering positioning data acquisition, generating a second pulse signal containing a timestamp, position information, and speed data. The second pulse signal is sent to the positioning base station 3 via the communication module. The housing of the positioning device 2 is resistant to rain and high-temperature environments, and it is equipped with a rechargeable lithium battery with an operating time of ≥5 hours. It also supports power supply from an external battery 301. To ensure secure installation, positioning device 2 is equipped with a magnetic base or an electric suction cup, suitable for metal or plastic roof surfaces, respectively. During installation, ensure that the arrow on the device is aligned with the vehicle's direction of travel to calibrate the IMU sensor's directional reference.

[0029] According to one embodiment of the present invention, the positioning base station 3 is responsible for receiving satellite signals and cooperating with the positioning device 2 to perform differential positioning calculations, and is a key device for achieving high-precision positioning. The base station consists of a housing, a tripod 304, a satellite signal receiving module, and a communication module. The housing is made of lightweight aluminum alloy, making it easy to carry and deploy. The satellite signal receiving module and the communication module are installed inside the housing. The housing is connected to the tripod 304 via a magnetic connector 303. A battery 301 is also installed below the tripod 304, and the battery 301 supplies power to the satellite signal receiving module and the communication module via a wire 302. The height of the tripod 304 is adjustable to ensure optimal signal reception in open areas. The satellite signal receiving module supports multi-mode positioning such as BeiDou and GPS, with a signal coverage range of ≥3km. The communication module establishes a low-power, long-distance wireless connection with the positioning device 2. Battery 301 is a lithium battery, which can be a V-type battery for easy mounting on tripod 304. The differential positioning calculation is based on the RTK algorithm, which compares the phase difference between the satellite signals of the base station and the positioning device 2 to eliminate errors such as atmospheric refraction and generate high-precision vehicle position data. For details, please refer to the patent with patent number ZL202411123892.4, which will not be elaborated here.

[0030] According to one embodiment of the present invention, the handheld terminal 5 is based on the Android system and supports cellular communication. The terminal runs a testing APP independently developed by Shandong University of Science and Technology. The user inputs vehicle parameters (license plate number, vehicle model), test parameters (initial speed, braking type, load status), and control commands (such as start / end test) through the APP. The terminal receives test data in real time from both the positioning device 2 and the positioning base station 3 via cellular communication or other communication methods. After the test is completed, the terminal can connect to a portable Bluetooth printer to print a test report containing information such as vehicle speed, braking distance, and average deceleration. The terminal supports offline caching, allowing data to be temporarily stored in environments with poor network conditions and uploaded to the cloud database after the network is restored.

[0031] According to one embodiment of the present invention, the voice broadcasting device 102 is installed in the driver's cab and connected to the positioning device 2 via a 3.5mm audio interface or Bluetooth. The system uses a high-fidelity speaker, and the volume can be adjusted via a knob to adapt to different driving environments. The broadcasting system receives voice control signals from the positioning device 2 and plays preset voice prompts, such as "Please accelerate to XX km / h," "Please press the brake pedal to 100," "Test complete," etc. The voice content supports custom recording to meet the needs of different testing scenarios. The broadcasting system has a built-in voice synthesis chip that supports both Chinese and English, ensuring that the driver can respond to commands promptly. The system housing is made of ABS material and is fixed to the dashboard by suction cups or adhesive, making installation convenient.

[0032] Please refer to Figure 5 In particular, the present invention also provides a satellite positioning braking performance testing method, based on the aforementioned satellite positioning braking performance testing instrument, comprising the following steps: S1. The starting device 1 is activated, and its built-in stroke sensor generates and sends a first pulse signal; S2. Positioning device 2 receives the first pulse signal, generates a second pulse signal, and sends it. S3. The positioning base station 3 receives the second pulse signal and performs differential positioning calculation based on the second pulse signal.

[0033] According to one embodiment of the present invention, the following steps are included before step S1: S001. Equipment Installation and Initialization: Place the positioning base station 3 in an open area of ​​the testing site, adjust the height of the tripod 304 to a suitable position, turn on the power, observe the status indicator lights, and confirm that the positioning signal and data transmission are normal. Fix the positioning device 2 to the top of the vehicle, ensuring no obstruction and that the arrow is aligned with the direction of travel. Install the starting device 1 on the brake pedal 100 and adjust the travel sensor to the zero position. Open the handheld terminal 5, start the testing APP, connect the positioning device 2, the starting device 1, and the base station, and check the network status and positioning signal.

[0034] S002. Input vehicle parameters via handheld terminal 5, including license plate number, vehicle type (car, truck, etc.), brake type (disc / drum), load status (empty / fully loaded), and initial alarm speed. Calibrate the travel sensor to ensure that the brake pedal 100 action is consistent with the signal output. Check the RTK signal strength and IMU sensor status of positioning device 2 to ensure normal data acquisition.

[0035] S003. Enter the detection process. The voice broadcast device 102 plays "Please accelerate," and the driver accelerates the vehicle to the specified speed (speed accuracy less than or equal to 0.02m / s). When the speed reaches the set value, the system plays "Please press the brake pedal 100," and the driver presses the brake pedal 100, triggering the stroke sensor to generate the first pulse signal.

[0036] According to one embodiment of the present invention, in steps S2 and S3, the positioning device 2 receives a first pulse signal, triggering the RTK positioning module and the IMU sensor to synchronously acquire position, velocity, and acceleration data, generating a second pulse signal. The second pulse signal is transmitted to the positioning base station 3 through the communication module. The base station performs differential positioning calculations to generate braking data with a time resolution of less than or equal to 20 ns. The data includes braking start point, braking distance, velocity change, and average deceleration, etc.

[0037] According to one embodiment of the present invention, after the vehicle stops, the voice system announces "Test complete," and the handheld terminal 5 displays the test data, including braking distance, average deceleration, and test duration. The user can click the "Print" button to generate a test report, which includes the test time, vehicle parameters, test parameters, and results.

[0038] According to one embodiment of the present invention, to improve the integration and applicability of the detection system, the communication between the starting device 1 and the positioning device 2 adopts a long-range radio module, which has low power consumption and wide coverage, making it suitable for field detection environments. Secondly, the positioning device 2 and the handheld terminal 5 support any one or more communication methods other than long-range radio, such as cellular communication, ensuring data transmission reliability in different network environments. Thirdly, the system supports modular design; the starting device 1, positioning device 2, and base station can be upgraded independently, reducing maintenance costs. Fourthly, the detection APP has a built-in data analysis module that can generate braking performance trend charts, facilitating user analysis of the differences in results from multiple tests. Furthermore, the system supports cloud data management; users can upload detection data to a cloud server via the APP to achieve data sharing and remote monitoring.

[0039] This system and method are applicable to a variety of testing scenarios, including annual inspections of commercial vehicles, road tests of new energy vehicles, and performance tests of special vehicles (such as fire trucks and ambulances). Figure 3This paper demonstrates the application of this system in tractors, a type of commercial vehicle. During tractor annual inspections, the system can quickly detect braking distance and deceleration, meeting national standards. It is understandable that tractors often operate on unpaved surfaces such as farmland, mountains, and muddy dirt roads, requiring their braking systems to withstand bumpy, slippery, and steep environments. Therefore, the testing not only simulates conventional road surfaces but also focuses on testing braking performance on muddy, soft soil, or steep slopes. These tests are conducted in the field, and the outdoor environment is well-suited for using this system for open-air testing. The wireless communication network constructed in this application provides ample space for these tests.

[0040] According to one embodiment of the present invention, to ensure system reliability, the communication module between the positioning device 2 and the base station adopts the AES-128 encryption protocol to prevent data tampering. The anti-interference design of the travel sensor ensures signal stability in strong electromagnetic environments. The voice broadcast device 102 is equipped with a low battery alarm function, emitting a prompt sound when the battery 301 charge is below 10% to avoid test interruption.

[0041] Please refer to Figure 3 In particular, the present invention also provides a vehicle comprising: Vehicle body 200; The starting device 1 is installed at the brake pedal 100 of the vehicle body 200. The starting device 1 includes a housing and a stroke sensor disposed in the housing. The stroke sensor can send a first pulse signal after being activated. The starting device 1 is electrically connected to the positioning device 2 located outside the vehicle body 200. The positioning device 2 can receive the first pulse signal and send the second pulse signal. The positioning device 2 is also wirelessly connected to the positioning base station 3. The positioning base station 3 can receive the second pulse signal and perform differential positioning calculation.

[0042] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A satellite positioning braking performance tester, characterized in that, include: The starting device includes a housing and a stroke sensor disposed within the housing, wherein the stroke sensor is capable of sending a first pulse signal after being activated; The positioning device is electrically connected to the starting device and is capable of receiving the first pulse signal. The positioning device is also capable of emitting a second pulse signal. The positioning device is configured to be located on the exterior of the vehicle being measured. The positioning base station is wirelessly connected to the positioning device and is configured to receive the second pulse signal and perform differential positioning calculation based on the second pulse signal.

2. The satellite positioning braking performance tester according to claim 1, characterized in that, The starting device is configured to be installed at the brake pedal of the vehicle being measured, and the stroke sensor is able to sense the movement of the brake pedal and generate a corresponding electrical signal. The starting device further includes a signal processing unit, which is capable of converting the electrical signal into the first pulse signal.

3. The satellite positioning braking performance tester according to claim 1, characterized in that, The positioning device includes a satellite positioning antenna, an IMU sensor, and a controller. The satellite positioning antenna and the IMU sensor are both electrically connected to the controller. The controller is configured to trigger the satellite positioning antenna and the IMU sensor to collect vehicle location information based on the first pulse signal, and to generate a second pulse signal containing the location information.

4. The satellite positioning braking performance tester according to claim 1 or 3, characterized in that, The positioning device is configured to be located on the top of the vehicle being measured.

5. The satellite positioning braking performance tester according to claim 1, characterized in that, The positioning base station includes a housing, a tripod, a satellite signal receiving module and a communication module disposed within the housing. The housing is mounted on the tripod. The satellite signal receiving module is capable of receiving satellite positioning signals. The communication module is used to establish a wireless communication connection with the positioning device.

6. The satellite positioning braking performance tester according to claim 1, characterized in that, It also includes a handheld terminal, which is wirelessly connected to both the positioning device and the positioning base station. The handheld terminal can send vehicle parameters to the positioning device and receive differential positioning calculations fed back by the positioning base station.

7. The satellite positioning braking performance tester according to claim 1, characterized in that, It also includes a voice broadcasting device, which is wirelessly connected to the positioning device and can receive voice control signals sent by the positioning device and play corresponding voice prompts according to the voice control signals.

8. A method for testing satellite positioning braking performance, based on the satellite positioning braking performance testing instrument as described in any one of claims 1 to 7, characterized in that, Includes the following steps: When the starting device is activated, its built-in stroke sensor generates and sends a first pulse signal; The positioning device receives the first pulse signal, generates a second pulse signal, and sends it. The positioning base station receives the second pulse signal and performs differential positioning calculation based on the second pulse signal.

9. The satellite positioning braking performance testing method as described in claim 8, characterized in that, Before the step-starting device is activated and its built-in stroke sensor generates and sends a first pulse signal, the following steps are also included: The positioning device is set at a preset position on the vehicle being measured, the starting device is installed at the vehicle's braking components, and the positioning base station is placed in an open area of ​​the monitoring area. Enable signal interaction between the positioning device and the activation device, between the positioning device and the positioning base station, between the positioning base station and the handheld terminal, and between the positioning device and the handheld terminal, and confirm that the positioning signals of each device are normal; Input vehicle-related information and test control parameters through the operating terminal.

10. A vehicle, characterized in that, include: Vehicle body; A starting device is installed at the brake pedal of the vehicle body. The starting device includes a housing and a stroke sensor disposed in the housing. The stroke sensor can send a first pulse signal after being activated. The starting device is electrically connected to a positioning device located outside the vehicle body. The positioning device is able to receive the first pulse signal and emit a second pulse signal. The positioning device is also wirelessly connected to a positioning base station. The positioning base station is able to receive the second pulse signal and perform differential positioning calculation.

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