Balance bike handlebars with balance detection function

Abstract

This utility model discloses a balance bike handlebar with a balance force detection function, comprising: a horizontal tube, two flexible pressure sensors, and a main control unit. A left handlebar is installed at one end of the horizontal tube, and a right handlebar is installed at the other end. The two flexible pressure sensors are a first flexible pressure sensor and a second flexible pressure sensor. The first flexible pressure sensor is embedded in the left handlebar, and the second flexible pressure sensor is embedded in the right handlebar. The main control unit is electrically connected to the first and second flexible pressure sensors respectively via flexible signal leads to acquire the pressure difference between the two sensors. This utility model allows the balance bike handlebar to collect real-time hand grip pressure data, enabling quantitative monitoring and periodic assessment of children's balance ability while riding, providing scientific data support for children's balance training.

Description

Technical Field

[0001] This utility model belongs to the field of intelligent sensing technology for sports equipment, specifically relating to a balance bike handlebar with balance force detection function. Background Technology

[0002] As an important tool for training young children's balance skills, balance bikes currently lack quantitative monitoring methods for assessing riders' balance. Traditional products rely solely on mechanical structure design to assist balance, which presents the following technical bottlenecks:

[0003] 1. Lack of visualization of balance status: It is impossible to perceive the difference in left and right forces when children are riding in real time, making it difficult to determine the developmental stage of balance ability;

[0004] 2. Lack of training effect evaluation: The system lacks long-term data recording capabilities, making it impossible to track the improvement trajectory of children's balance ability through historical data;

[0005] While existing technologies utilize pressure sensors in handlebars, none are optimized for the specific needs of children's balance development. Therefore, there is an urgent need to develop a flexible sensing system for balance bike handlebars specifically designed for children's balance bikes, capable of accurately capturing changes in balance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a balance bike handlebar with a balance force detection function. This handlebar uses a flexible pressure sensor to collect data on the pressure distribution of both hands during riding in real time, which can serve as a basis for assessing children's balance ability.

[0007] The objective of this utility model is achieved through the following technical solution.

[0008] A balance scooter handlebar with balance force detection function includes: a horizontal tube, two flexible pressure sensors and a main control unit. A left handlebar is installed at one end of the horizontal tube and a right handlebar is installed at the other end of the horizontal tube. The two flexible pressure sensors are a first flexible pressure sensor and a second flexible pressure sensor. The first flexible pressure sensor is embedded in the left handlebar and the second flexible pressure sensor is embedded in the right handlebar.

[0009] The main control unit is electrically connected to the first flexible pressure sensor and the second flexible pressure sensor via flexible signal leads to obtain the pressure difference between the first flexible pressure sensor and the second flexible pressure sensor.

[0010] In the above technical solution, both flexible pressure sensors are piezoresistive pressure sensors.

[0011] In the above technical solution, the main control unit includes: a main control chip, an ADC chip, a wireless communication module, a Wheatstone bridge, a differential amplifier, and a power supply module, wherein the power supply module provides power to the main control chip and the Wheatstone bridge.

[0012] The Wheatstone bridge is electrically connected to two flexible pressure sensors to convert the resistance changes generated by each flexible pressure sensor into voltage signals. The differential amplifier is used to obtain the voltage signal output by the Wheatstone bridge, and then outputs the voltage signal as an analog signal after differential amplification, and transmits it to the ADC chip.

[0013] ADC chips are used to convert analog signals into digital signals before sending them to the main control chip.

[0014] The main control chip is used to convert digital signals into pressure values, calculate the pressure difference (including timestamps) between the two flexible pressure sensors, and transmit the values ​​to the terminal device via a wireless communication module.

[0015] In the above technical solution, the main control chip has a built-in low-pass filter.

[0016] In the above technical solution, the main control chip is an STM32F103.

[0017] In the above technical solution, the wireless communication module adopts Bluetooth with model number BLE4.2.

[0018] In the above technical solution, the low-pass filter is a 5th-order Butterworth low-pass filter with a cutoff frequency of 10Hz;

[0019] In the above technical solution, the communication protocol of the wireless communication module adopts a custom BLE data frame format.

[0020] In the above technical solution, the first flexible pressure sensor is embedded in the left handlebar at a position corresponding to the palm, and the second flexible pressure sensor is embedded in the right handlebar at a position corresponding to the palm. The first flexible pressure sensor is embedded in the right part of the left handlebar, and the second flexible pressure sensor is embedded in the left part of the right handlebar.

[0021] In the above technical solution, the left and right vehicle handles have grooves formed at the positions for embedding flexible pressure sensors, and the bottom of the grooves is an arc surface.

[0022] In the above technical solution, the flexible pressure sensor is encapsulated in a groove with silicone.

[0023] In the above technical solution, the pressure detection range of the flexible pressure sensor is 0-50N, and the linearity error is ≤±2%.

[0024] In the above technical solution, the flexible pressure sensor has a bendable radius of curvature ≥ 5mm.

[0025] In the above technical solution, the Shore hardness of silicone is A 35-45.

[0026] In the above technical solution, the surface roughness of the silicone is ≤1.6μm.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This utility model is the first to apply flexible pressure sensing technology to the balance ability monitoring of a child balance bike without power drive. It collects the pressure data of both hands holding the bike in real time, realizes the quantitative monitoring and phased evaluation of the child's balance ability while riding, provides scientific data support for the training of children's balance ability, and breaks through the limitations of traditional products that rely solely on mechanical structures.

[0029] 2. Through the long-term data recording function, historical data tracking can be used to achieve quantitative analysis of children's balance development, which solves the problem that traditional balance bikes cannot quantitatively assess children's balance ability, provides data support for personalized training programs, fills the technological gap in this field, and provides parents and training institutions with scientific training effect references. At the same time, the flexible design meets the safety standards for children's products.

[0030] 3. By using a flexible pressure sensor encapsulated in silicone, noise signals generated by hand shaking during children's riding are effectively suppressed, ensuring high signal-to-noise ratio acquisition of pressure data. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the handlebars of the self-balancing scooter according to this utility model;

[0032] Figure 2 This is a schematic diagram of the main control unit in this utility model.

[0033] Among them, 1: horizontal tube, 2: flexible pressure sensor, 3: flexible signal lead. Detailed Implementation

[0034] The following is a detailed description of the balance scooter handlebar with balance force detection function according to the present invention, with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1As shown, a balance scooter handlebar with balance force detection function includes: a horizontal tube 1, two flexible pressure sensors 2, and a main control unit. A left handlebar is installed at one end of the horizontal tube, and a right handlebar is installed at the other end. The two flexible pressure sensors are a first flexible pressure sensor and a second flexible pressure sensor. The first flexible pressure sensor is embedded in the left handlebar, and the second flexible pressure sensor is embedded in the right handlebar. The two flexible pressure sensors are used to acquire the pressure signal at the palm of the user's hand when holding the left and right handlebars.

[0037] The main control unit is electrically connected to the first flexible pressure sensor and the second flexible pressure sensor respectively through flexible signal lead 3, in order to obtain the pressure difference between the first flexible pressure sensor and the second flexible pressure sensor.

[0038] The working principle of the balance bike handlebar with balance force detection function is as follows: When riding, both hands apply pressure to the right handlebar and the left handlebar at both ends of the cross tube, respectively. The main control unit obtains the pressure difference value of the first flexible pressure sensor and the second flexible pressure sensor, and the pressure difference reflects the degree of balance deviation when riding.

[0039] Example 2

[0040] A balance scooter handlebar with balance force detection function, based on embodiment 1, uses two piezoresistive pressure sensors as both flexible pressure sensors.

[0041] like Figure 2 As shown, the main control unit includes: a main control chip, an ADC chip, a wireless communication module, a Wheatstone bridge, a differential amplifier, and a power supply module. The power supply module provides power to the main control chip and the Wheatstone bridge. In this embodiment, the power supply module uses a 3.7V lithium battery (capacity of 200mAh, battery life ≥8 hours).

[0042] Wheatstone bridges are connected to two flexible pressure sensors respectively. Figure 2 (Not shown) Electrical connection, used to convert the resistance value change generated by each flexible pressure sensor into a voltage signal (the voltage range is 0-3.3V when the pressure range is 0-50N linear response). Differential amplifier is used to obtain the voltage signal output by Wheatstone bridge, and then the voltage signal is differentially amplified (gain 100 times) to output an analog signal and transmit it to the ADC chip.

[0043] An ADC chip (with 12-bit quantization precision) is used to convert analog signals into digital signals and then send them to the main control chip; in this embodiment, the ADC chip is a high-precision chip of model CS5532.

[0044] The main control chip converts the digital signal into a pressure value, calculates the pressure difference (including timestamp) between the two flexible pressure sensors, and transmits it to the terminal device via a wireless communication module. The main control chip incorporates a low-pass filter that uses a data filtering algorithm to remove high-frequency interference, combined with a dynamic time warping (DTW) algorithm. In this embodiment, the main control chip is an integrated STM32F103 microcontroller. The wireless communication module uses Bluetooth BLE4.2.

[0045] The terminal device can perform the following functions:

[0046] (1) Real-time display of the pressure values ​​of two flexible pressure sensors to form a pressure curve and a dynamic histogram of the pressure difference (ΔP) to realize the visualization of pressure data.

[0047] (2) The terminal device has a storage function and supports querying stored historical data by week / month / year.

[0048] (3) It can also be based on machine learning models to analyze parameters such as the standard deviation of the pressure difference and the proportion of balance maintenance time, and generate a balance ability assessment report with star rating and training suggestions.

[0049] As a preferred option, the low-pass filter is a 5th-order Butterworth low-pass filter with a cutoff frequency of 10Hz.

[0050] Preferably, the wireless communication module uses a custom BLE data frame format, which includes information such as timestamps, pressure values ​​from individual flexible pressure sensors, and battery level.

[0051] When a child rides a bicycle, the pressure from their hands on the handlebars causes a change in the resistance of the flexible pressure sensor. This change is converted into a voltage signal by a Wheatstone bridge and sent to a differential amplifier to amplify the analog signal. The analog signal is then converted into a digital signal by an ADC chip and sent to the main control chip for processing. The chip calculates the pressure difference ΔP between the two flexible pressure sensors in real time, filters out noise, and synchronizes the pressure difference to the terminal device via a wireless communication module.

[0052] Example 3

[0053] A balance scooter handlebar with balance force detection function, based on embodiment 2, has a first flexible pressure sensor embedded in the left handlebar at the palm position, and a second flexible pressure sensor embedded in the right handlebar at the palm position. The grip area of ​​the left handlebar, corresponding to the palm position, has an arc (fitting the user's palm), and the grip area of ​​the right handlebar also has an arc (fitting the user's palm). This arc design allows the flexible pressure sensors to better receive the pressure signal from the palm, ensuring effective transmission of the pressure signal.

[0054] Preferably, the first flexible pressure sensor is embedded in the right part of the left vehicle handle. The second flexible pressure sensor is embedded in the left part of the right vehicle handle.

[0055] In this embodiment, the first and second flexible pressure sensors can be flexible piezoresistive sensors (the size of the flexible piezoresistive sensor is 30mm × 10mm × 5mm) disclosed in Yu Y, Zhao Y, Xue T, et al. Mechano-Filtering Encapsulation: A Stitching-Based Packaging Strategy Implementing Active Noise Suppression in Piezoresistive Pressure Sensors[J]. Micromachines, 2025, 16(4). The substrate material of this flexible piezoresistive sensor is a highly elastic melamine sponge (density range of 8-12 mg / cm³). 3 The flexible piezoresistive sensor has a sensitive layer, which is a carbon nanotube conductive network (single-walled carbon nanotube content 1.5-2.5wt%, resistivity ≤0.8Ω·cm). The flexible piezoresistive sensor is encapsulated with a medical-grade silicone full-coverage layer (thickness 0.5mm, Shore hardness A35-45). The flexible piezoresistive sensor has a bendable radius of curvature ≥5mm.

[0056] In this embodiment, the handlebar of the self-balancing scooter is injection molded from ABS engineering plastic. A 31mm×11mm×6mm groove is formed at the position for embedding the flexible pressure sensor. The bottom of the groove is arc-shaped to fit the shape of the flexible pressure sensor. The bottom of the groove is pre-set with an FPC circuit wiring channel to ensure that the flexible signal lead (which is a flexible circuit with a silver-plated copper core) is installed in a concealed manner.

[0057] The flexible pressure sensor is embedded in the groove, and the flexible pressure sensor is encapsulated in the groove with silicone. The specific manufacturing method is as follows: the purchased flexible pressure sensor is embedded in the groove, and liquid silicone (Dow Corning SYLGARD 184) is injected for secondary encapsulation; after the liquid silicone is cured at 60°C for 2 hours, the sensor and the balance bike handlebar form an integrated tooling with a surface roughness ≤1.6μm, which meets the safety standards for children's products.

[0058] The present invention has been described above by way of example. It should be noted that, without departing from the core of the present invention, any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort fall within the protection scope of the present invention.

Claims

1. A balance car handle with a balance force detection function, characterized in that, include: The system includes a horizontal tube (1), two flexible pressure sensors (2), and a main control unit. A left handlebar is installed at one end of the horizontal tube (1), and a right handlebar is installed at the other end. The two flexible pressure sensors (2) are a first flexible pressure sensor and a second flexible pressure sensor. The first flexible pressure sensor is embedded in the left handlebar, and the second flexible pressure sensor is embedded in the right handlebar. The two flexible pressure sensors (2) are used to acquire the pressure signal at the palm of the user's hand when the user holds the left handlebar and the right handlebar. The main control unit is electrically connected to the first flexible pressure sensor and the second flexible pressure sensor via flexible signal leads (3) to obtain the pressure difference between the first flexible pressure sensor and the second flexible pressure sensor.

2. The balance car handle according to claim 1, characterized in that, Both flexible pressure sensors (2) are piezoresistive pressure sensors.

3. The balance car handle according to claim 2, characterized in that, The main control unit includes: a main control chip, an ADC chip, a wireless communication module, a Wheatstone bridge, a differential amplifier, and a power supply module. The power supply module provides power to the main control chip and the Wheatstone bridge. The Wheatstone bridge is electrically connected to two flexible pressure sensors (2) respectively, and is used to convert the resistance value change generated by each flexible pressure sensor (2) into a voltage signal. The differential amplifier is used to obtain the voltage signal output by the Wheatstone bridge, and then output the voltage signal as an analog signal after differential amplification, and transmit it to the ADC chip. ADC chips are used to convert analog signals into digital signals before sending them to the main control chip; The main control chip is used to convert digital signals into pressure values ​​and then calculate the pressure difference between the two flexible pressure sensors (2), and transmit the values ​​to the terminal device through the wireless communication module.

4. The balance car handle according to claim 2, characterized in that, The first flexible pressure sensor is embedded in the left handlebar at the position corresponding to the palm, and the second flexible pressure sensor is embedded in the right handlebar at the position corresponding to the palm. The first flexible pressure sensor is embedded in the right part of the left handlebar, and the second flexible pressure sensor is embedded in the left part of the right handlebar.

5. The balance car handle according to claim 4, characterized in that, The left and right vehicle handles have grooves formed at the positions for mounting the flexible pressure sensor (2), and the bottom of the grooves is an arc surface.

6. The balance car handle according to claim 5, characterized in that, The flexible pressure sensor (2) is encapsulated in a groove with silicone.

7. The balance car handle according to claim 6, characterized in that, The pressure detection range of the flexible pressure sensor (2) is 0-50N, and the linearity error is ≤±2%.

8. The balance car handle according to claim 1, characterized in that, The flexible pressure sensor (2) has a bendable radius of curvature ≥ 5 mm.

9. The balance scooter handlebar according to claim 6, characterized in that, The Shore hardness of silicone is A 35-45.

10. The handlebar of the self-balancing scooter according to claim 6, characterized in that, The surface roughness of silicone is ≤1.6μm.

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