A system and method for measuring the turning diameter of a vehicle

Abstract

This invention provides a vehicle turning diameter measurement system and method. The measurement system includes a wheel speed sensor, a GPS module, a data acquisition unit, and a computer. The wheel speed sensor is installed on the vehicle's wheels and communicates with the data acquisition unit. The wheel speed sensor detects the number of wheel rotations by counting pulses. The GPS module is installed on the vehicle's roof and communicates with the data acquisition unit. The GPS module collects the vehicle's speed signal and locates the vehicle's starting and ending positions. The data acquisition unit communicates with the computer. The data acquisition unit collects data from the wheel speed sensor and the GPS module and transmits it to the computer. The computer calculates the vehicle's turning diameter D based on the data from the wheel speed sensor and the GPS module. The measurement solution provided by this application eliminates the need for water spraying, allows for measurement at any time, and improves measurement accuracy, environmental adaptability, and product development efficiency.

Description

Technical Field

[0001] This invention belongs to the field of vehicle turning diameter measurement technology, specifically relating to a vehicle turning diameter measurement system and method. Background Technology

[0002] In the development of vehicle chassis, the turning diameter is a crucial physical quantity that affects vehicle maneuverability and passability. The traditional measurement method uses the water spraying method from the national standard GB / T 12540-2009. Specifically, water is sprayed onto the outer front wheels during a turn to create wheel tracks, and the diameter of the track circle is measured with a tape measure. This method has two drawbacks: firstly, the circular track formed by the water spraying method may contain errors; secondly, testing cannot be conducted on rainy days, and it no longer meets the development needs of automotive chassis.

[0003] There are currently no solutions to the technical problems existing in the measurement of vehicle turning diameter; therefore, there is an urgent need to find effective solutions to address these issues. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing a vehicle turning diameter measurement system and method, aiming to solve the problems in existing vehicle turning diameter measurement.

[0005] This invention provides a vehicle turning diameter measurement system, comprising wheel speed sensors, a GPS module, a data acquisition unit, and a computer. The wheel speed sensors are mounted on the vehicle's wheels and communicate with the data acquisition unit. The wheel speed sensors detect the number of wheel rotations by counting pulses. The GPS module is mounted on the vehicle's roof and communicates with the data acquisition unit. The GPS module collects the vehicle's speed signal and locates the vehicle's starting and stopping positions. The data acquisition unit communicates with the computer. The data acquisition unit collects data from the wheel speed sensors and the GPS module between the starting and stopping positions and transmits it to the computer. The computer calculates the vehicle's turning diameter D based on the data from the wheel speed sensors and the GPS module.

[0006] Furthermore, the computer is equipped with MATLAB software; the computer uses the ginput function of MATLAB software, along with pulse counts from wheel speed sensors and vehicle speed signals from the GPS module, to capture the vehicle's initial position and stopping position.

[0007] Furthermore, the starting and ending positions of the vehicle inspection are the same positions after the vehicle has traveled one full cycle.

[0008] Furthermore, the computer calculates the turning diameter D of the test vehicle according to the following formula;

[0009] D = L / π, where L is the distance traveled by the wheels of the test vehicle;

[0010] L = N / M * 2 * π * R, where N is the pulse count of the wheel speed sensor; M is the number of pulses per wheel revolution; and R is the wheel rolling radius.

[0011] Accordingly, the present invention also provides a method for measuring the turning diameter of a vehicle, employing the vehicle turning diameter measuring system described above; the measurement method includes the following steps:

[0012] S1: Install wheel speed sensors on the left and right front wheels of the test vehicle respectively, and connect them to the data acquisition instrument.

[0013] S2: Install the GPS module on the roof of the test vehicle and connect it to the data acquisition unit for communication.

[0014] S3: Place the test vehicle at the starting position of the test and drive it around once to return to the starting position;

[0015] S4: During the test vehicle's one-round journey, the wheel speed sensor detects the number of wheel rotations by counting pulses, the GPS module collects the vehicle's starting and stopping positions, and the GPS module also collects the vehicle's speed signal.

[0016] S5: The data acquisition unit collects the pulse counts from the wheel speed sensor and the vehicle speed signal from the GPS module, and imports them into the computer;

[0017] S6: The computer calculates the turning diameter D of the vehicle based on the pulse count and vehicle speed signal.

[0018] Furthermore, in step S3: a starting mark is set at the starting position of the test. The test vehicle travels one revolution from the starting position at the lowest forward gear speed and then returns to the starting position. During the test vehicle's travel, the steering wheel of the test vehicle reaches the limit position and remains unchanged. After the test vehicle is stable, the data acquisition instrument is started.

[0019] Furthermore, in step S3: the test vehicle travels one full turn to the left and one full turn to the right, respectively, and data for the left turn and right turn are collected, and the turning diameters D1 and D2 for the left turn and right turn are calculated respectively; when the difference between the turning diameters D1 and D2 is within 0.1m, the turning diameter of the vehicle is D = (D1 + D2) / 2; when the difference between the turning diameters D1 and D2 is greater than 0.1m, the larger value of the turning diameters D1 and D2 is taken as the turning diameter D of the vehicle.

[0020] Furthermore, before step S1: the FIM module of the data acquisition instrument is set to pulse counting mode; in step S6: the computer uses the ginput function of MATLAB software, and uses the pulse count of the wheel speed sensor and the vehicle speed signal of the GPS module to intercept the initial position and the stopping position of the vehicle.

[0021] Furthermore, the computer calculates the turning diameter D of the test vehicle according to the following formula;

[0022] D = L / π, where L is the distance traveled by the wheels of the test vehicle;

[0023] L = N / M * 2 * π * R, where N is the pulse count of the wheel speed sensor, M is the number of pulses per wheel revolution, and R is the wheel rolling radius.

[0024] Furthermore, the wheel rolling radius R is set to 300mm to 350mm; the number of pulses per wheel revolution M is 1.

[0025] The measurement solution provided in this application eliminates the need for water spraying, enables measurements to be taken at any time, and improves measurement accuracy, environmental adaptability, and product development efficiency. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of a vehicle turning diameter measurement system according to the present invention;

[0029] Figure 2 This is a flowchart of a method for measuring the turning diameter of a vehicle according to the present invention;

[0030] Figure 3 This is a schematic diagram of data acquisition from the wheel speed sensor and GPS module of the present invention. Detailed Implementation

[0031] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] like Figure 1 As shown, this invention provides a vehicle turning diameter measurement system for measuring the turning diameter of a vehicle; the measurement system includes a wheel speed sensor, a GPS module, a data acquisition unit, and a computer; specifically,

[0037] Wheel speed sensors are installed on the wheels of a vehicle and communicate with a data acquisition unit. Furthermore, the wheel speed sensors detect the number of revolutions of the wheel by counting pulses, that is, the number of revolutions of the wheel in one round of travel, with one round being measured in terms of the vehicle's travel.

[0038] The GPS module is installed on the roof of the vehicle and communicates with the data acquisition unit; furthermore, the GPS module is used to collect the vehicle's speed signal and locate the starting and stopping positions of the vehicle detection.

[0039] The data acquisition unit is connected to a computer for communication; specifically, the data acquisition unit is used to collect data from the wheel speed sensor and GPS module between the vehicle's starting and stopping positions, and transmit the data to the computer.

[0040] The computer calculates the vehicle's turning diameter D based on data from the wheel speed sensors and the GPS module; specifically, the data acquisition unit (i.e., V-BOX) reads the pulse counts from the wheel speed sensors and calculates the minimum turning radius using the wheel rolling radius and the pulse count values.

[0041] The vehicle turning diameter measurement system provided by this invention can effectively measure the turning diameter of vehicles without the need for water spraying. It can be measured at any time, improving measurement accuracy and environmental adaptability, and increasing product development efficiency.

[0042] Preferably, in conjunction with the above scheme, in this embodiment: the computer is equipped with MATLAB software and can be connected independently, which facilitates on-site data collection and data import and calculation anywhere; specifically, the computer uses the ginput function of MATLAB software and the pulse count of the wheel speed sensor and the vehicle speed signal of the GPS module to capture the initial position and the stopping position of the vehicle, thereby ensuring that the data collected during the test vehicle's one-week journey is valid data and improving the effectiveness of the test; specifically, the ginput function of MATLAB software is existing technology and will not be described in detail here.

[0043] Preferably, in conjunction with the above scheme, in this embodiment: the starting position and the stopping position of vehicle detection are the same position after the vehicle has traveled one cycle; specifically: the same position after the vehicle has traveled one cycle, preferably one cycle of the car's travel is considered as one circle.

[0044] Preferably, in conjunction with the above scheme, in this embodiment: the computer calculates the turning diameter D of the test vehicle according to the following formula; specifically:

[0045] D = L / π, where L is the distance traveled by the wheels of the test vehicle;

[0046] L = N / M*2*π*R, where N is the pulse count of the wheel speed sensor, which is measured by the wheel speed sensor; M is the number of pulses per wheel revolution, which is designed according to actual needs, preferably 1; further, R is the wheel rolling radius, preferably 300mm to 350mm, more preferably 325 or 335.

[0047] Accordingly, in conjunction with the above schemes, such as Figure 2 As shown, the present invention also provides a method for measuring the turning diameter of a vehicle, using the vehicle turning diameter measuring system described above; specifically, the measurement method includes the following steps:

[0048] S1: Install wheel speed sensors on the left and right front wheels of the test vehicle respectively, and connect them to the data acquisition unit; specifically, the wheel speed sensors are installed at the center of the wheel hub.

[0049] S2: Install the GPS module on the roof of the test vehicle and connect it to the data acquisition unit for communication.

[0050] S3: Place the test vehicle at the starting position of the test, drive it around once and return to the starting position, then drive the test vehicle out of the measurement area;

[0051] S4: During the test vehicle's one-round journey, the wheel speed sensor detects the number of wheel rotations by counting pulses; the GPS module collects the vehicle's starting and stopping positions, and also collects the vehicle's speed signal.

[0052] S5: The data acquisition unit collects the pulse counts from the wheel speed sensor and the vehicle speed signal from the GPS module, and imports them into the computer;

[0053] S6: The computer calculates the turning diameter D of the vehicle based on the pulse count and vehicle speed signal.

[0054] Preferably, in conjunction with the above scheme, in this embodiment: in step S3: a starting mark is set at the starting position of the detection, the test vehicle travels one revolution from the starting position at the lowest forward gear (i.e., idle gear, D gear without acceleration) and then returns to the starting position; specifically, during the driving of the test vehicle, the steering wheel of the test vehicle reaches the limit position and remains unchanged; after the test vehicle is driving steadily, the data acquisition instrument is started.

[0055] Preferably, in conjunction with the above scheme, in this embodiment: in step S3: the test vehicle drives one full turn to the left and one full turn to the right, respectively, and collects data for the left turn and the right turn, respectively, and calculates the turning diameter D1 for the left turn and the turning diameter D2 for the right turn; when the difference between the turning diameter D1 and the turning diameter D2 is within 0.1m, the turning diameter D of the vehicle is (D1+D2) / 2; when the difference between the turning diameter D1 and the turning diameter D2 is greater than 0.1m, the larger value of the turning diameter D1 or the turning diameter D2 is taken as the turning diameter D of the vehicle.

[0056] Preferably, in conjunction with the above scheme, in this embodiment: before step S1: the FIM module of the data acquisition instrument is set to pulse counting mode; in step S6: the computer uses the ginput function of MATLAB software and the pulse count of the wheel speed sensor and the vehicle speed signal of the GPS module to intercept the initial position and the stopping position of the vehicle, thereby ensuring that the data collected within one week of the test vehicle's operation is valid data and improving the effectiveness of the test.

[0057] Preferably, in conjunction with the above scheme, in this embodiment: the computer calculates the turning diameter D of the test vehicle according to the following formula; specifically:

[0058] D = L / π, where L is the distance traveled by the wheels of the test vehicle;

[0059] L = N / M * 2 * π * R, where N is the pulse count of the wheel speed sensor, M is the number of pulses per wheel revolution, and R is the wheel rolling radius.

[0060] Preferably, in combination with the above scheme, in this embodiment, based on actual design requirements, the wheel rolling radius R is preferably 300mm to 350mm, preferably 325 or 335; furthermore, the number of pulses M per wheel revolution is preferably 1.

[0061] Specifically, see Figure 3 As shown in Table 1 below, this is a comparison of a measurement process of a specific embodiment of this application with the prior art (i.e., the water spraying method); the wheel speed method is the vehicle turning diameter measurement method provided in this application:

[0062] Table 1

[0063]

[0064] The measurement solution provided in this application eliminates the need for water spraying, enables measurements to be taken at any time, and improves measurement accuracy, environmental adaptability, and product development efficiency.

[0065] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. A vehicle turning diameter measurement system, characterized in that, The measurement system includes a wheel speed sensor, a GPS module, a data acquisition device, and a computer; The wheel speed sensor is mounted on the vehicle's wheels and is communicatively connected to the data acquisition unit; the wheel speed sensor detects the number of revolutions the wheels make by counting pulses. The GPS module is installed on the roof of the vehicle and communicates with the data acquisition device; the GPS module is used to collect the vehicle speed signal and locate the starting and stopping positions of the vehicle detection. The data acquisition device is communicatively connected to the computer; the data acquisition device is used to collect data from the wheel speed sensor and the GPS module between the vehicle's starting position and stopping position, and transmit the data to the computer. The computer calculates the turning diameter D of the vehicle based on the data from the wheel speed sensor and the GPS module.

2. The vehicle turning diameter measurement system according to claim 1, characterized in that, The computer is equipped with MATLAB software; the computer uses the ginput function of the MATLAB software, along with the pulse count of the wheel speed sensor and the vehicle speed signal from the GPS module, to extract the initial position and the stopping position of the vehicle.

3. The vehicle turning diameter measurement system according to claim 1, characterized in that, The starting and stopping positions of the vehicle detection are the same positions after the vehicle has traveled one cycle.

4. The vehicle turning diameter measurement system according to claim 1, characterized in that, The computer calculates the turning diameter D of the test vehicle according to the following formula; D = L / π, where L is the wheel travel distance of the test vehicle; L = N / M * 2 * π * R, where N is the pulse count of the wheel speed sensor; M is the number of pulses per wheel revolution; and R is the wheel rolling radius.

5. A method for measuring the turning diameter of a vehicle, using the vehicle turning diameter measuring system described in claim 1; Its features are, The measurement method includes the following process: S1: Install wheel speed sensors on the left and right front wheels of the test vehicle respectively, and connect them to the data acquisition instrument. S2: Install the GPS module on the roof of the test vehicle and connect it to the data acquisition unit for communication. S3: Position the test vehicle at the starting position of the test and drive it around once to return to the starting position; S4: During the test vehicle's one-cycle operation, the wheel speed sensor detects the number of revolutions of the wheel by counting pulses; the GPS module collects the vehicle's starting and stopping positions, and also collects the vehicle's speed signal. S5: The data acquisition device collects the pulse counts from the wheel speed sensor and the vehicle speed signal from the GPS module, and imports them into the computer; S6: The computer calculates the turning diameter D of the vehicle based on the pulse count and the vehicle speed signal.

6. The method for measuring the turning diameter of a vehicle according to claim 5, characterized in that, In step S3: a starting mark is set at the starting position of the detection. The test vehicle travels one revolution from the starting position at the lowest forward gear speed and then returns to the starting position. During the driving of the test vehicle, the steering wheel of the test vehicle reaches the limit position and remains unchanged. After the test vehicle is driving steadily, the data acquisition instrument is started.

7. The method for measuring the turning diameter of a vehicle according to claim 5, characterized in that, In step S3: the test vehicle travels one full turn to the left and one full turn to the right, respectively, and collects data for the left turn and right turn, respectively, and calculates the turning diameter D1 for the left turn and the turning diameter D2 for the right turn; when the difference between the turning diameter D1 and the turning diameter D2 is within 0.1m, the turning diameter D of the vehicle is (D1+D2) / 2; when the difference between the turning diameter D1 and the turning diameter D2 is greater than 0.1m, the larger value of the turning diameter D1 or the turning diameter D2 is taken as the turning diameter D of the vehicle.

8. The method for measuring the turning diameter of a vehicle according to claim 5, characterized in that, Before step S1: the FIM module of the data acquisition instrument is set to pulse counting mode; in step S6: the computer uses the ginput function of MATLAB software, and uses the pulse count of the wheel speed sensor and the vehicle speed signal of the GPS module to intercept the initial position and the stopping position of the vehicle.

9. The method for measuring the turning diameter of a vehicle according to claim 5, characterized in that, The computer calculates the turning diameter D of the test vehicle according to the following formula; D = L / π, where L is the wheel travel distance of the test vehicle; L = N / M * 2 * π * R, where N is the pulse count of the wheel speed sensor, M is the number of pulses per wheel revolution, and R is the wheel rolling radius.

10. The method for measuring the turning diameter of a vehicle according to claim 9, characterized in that, The rolling radius R of the wheel is between 300mm and 350mm; the number of pulses M per wheel revolution is 1.

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