Balance scooter seat with balance monitoring function

Abstract

This utility model discloses a balance scooter seat with balance force monitoring function, including: an ergonomic seat cushion, two sets of flexible pressure sensor units, and a main control unit. A groove is formed along the centerline of the ergonomic seat cushion, with the length of the groove extending along the front-to-back direction of the ergonomic seat cushion. One set of flexible pressure sensor units is embedded in the ergonomic seat cushion on the left side of the groove, and another set is embedded in the ergonomic seat cushion on the right side of the groove. The two sets of flexible pressure sensor units are used to acquire the pressure of the user's buttocks on the ergonomic seat cushion during riding. The main control unit is electrically connected to the two sets of flexible pressure sensor units via flexible cables to acquire the pressure difference between the two sets of flexible pressure sensor units. This utility model acquires pressure distribution data of the ischial tuberosity support area of ​​the buttocks in real time, accurately calculates the center of gravity shift parameters during riding, and provides objective data for balance training.

Description

Technical Field

[0001] This utility model belongs to the field of intelligent sensing technology for children's balance training equipment, specifically relating to a balance bike seat with balance force monitoring function. Background Technology

[0002] In the field of children's balance development, traditional non-motorized balance bikes have significant technical shortcomings:

[0003] 1. Lack of monitoring of core stress points: Existing bicycle seats only provide physical support and cannot capture pressure changes in the ischial tuberosity support area during cycling, while the ability to control the center of gravity of the hips is a key physiological indicator for balance training.

[0004] 2. The evaluation system is highly subjective: relying on traditional methods such as manual observation or simple timing, it lacks objective data support based on body biomechanical signals, making it difficult to scientifically judge the training effectiveness;

[0005] 3. Insufficient sensor compatibility: Most of the sensor solutions for commercially available seats are designed for adults, which have problems such as high structural rigidity, high signal noise, and poor fit to children's body size. In particular, the data reliability is low in complex road environments.

[0006] Although pressure sensing technology has been applied in the field of motion monitoring, there is still a lack of solutions specifically tailored to the physiological characteristics of children. Therefore, there is an urgent need to develop a balance bike seat with a seat-type monitoring system that conforms to the curve of a child's hip and has high anti-interference capabilities. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a balance scooter seat with a balance force monitoring function. This balance scooter seat uses a flexible pressure sensor unit to collect real-time data on the pressure distribution of the buttocks during riding.

[0008] The objective of this utility model is achieved through the following technical solution.

[0009] A balance scooter seat with balance force monitoring function includes: an ergonomic seat cushion, two sets of flexible pressure sensor units, and a main control unit. A groove is formed on the center line of the ergonomic seat cushion, and the length direction of the groove is set along the front-back direction of the ergonomic seat cushion. A set of flexible pressure sensor units is embedded in the ergonomic seat cushion on the left side of the groove, and a set of flexible pressure sensor units is embedded in the ergonomic seat cushion on the right side of the groove. The two sets of flexible pressure sensor units are the left flexible pressure sensor unit and the right flexible pressure sensor unit. The two sets of flexible pressure sensor units are used to obtain the pressure of the user's buttocks on the ergonomic seat cushion when riding. The main control unit is electrically connected to the two sets of flexible pressure sensor units respectively through flexible ribbon cables to obtain the pressure difference between the two sets of flexible pressure sensor units.

[0010] In the above technical solution, the main control unit includes: MCU, analog-to-digital conversion module, wireless communication module, Wheatstone bridge, instrumentation amplifier and power supply module, wherein the power supply module provides power to MCU and Wheatstone bridge;

[0011] The Wheatstone bridge is electrically connected to two sets of flexible pressure sensor units to convert the resistance changes generated by each set of flexible pressure sensor units into voltage signals. The instrumentation 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 analog-to-digital conversion module.

[0012] The analog-to-digital converter module is used to convert analog signals into digital signals and then send them to the MCU; the MCU is used to convert digital signals into pressure values ​​and then calculate the pressure difference between the two sets of flexible pressure sensor units.

[0013] In the above technical solution, the MCU has a built-in median filter.

[0014] In the above technical solution, the MCU adopts the STM32L452 microcontroller.

[0015] In the above technical solution, the wireless communication module adopts Bluetooth with model number BLE5.0.

[0016] In the above technical solution, the MCU is also connected to a motion state recognition module, which is a three-axis accelerometer.

[0017] In the above technical solution, two sets of flexible pressure sensor units are symmetrically embedded in the ergonomic seat cushion with a spacing of 95-115mm.

[0018] In the above technical solution, each flexible pressure sensor unit includes two pressure sensors, and the two pressure sensors of the same flexible pressure sensor unit are arranged along the edge of the groove.

[0019] In the above technical solution, the surface of the ergonomic seat cushion for mounting the flexible pressure sensor has a mounting groove, the edge of the mounting groove is rounded, and the flexible pressure sensor is embedded in the mounting groove.

[0020] In the above technical solution, the minimum bending radius of the pressure sensor is ≤8mm, and the linearity error of the pressure sensor is ≤±1.2%.

[0021] In the above technical solution, the flexible pressure sensor is encapsulated in a mounting groove with silicone.

[0022] In the above technical solution, the silicone surface above the flexible pressure sensor is covered with a breathable woven fiber layer.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This utility model is the first to apply flexible sensing technology to children's balance bike seats, which can acquire pressure distribution data of the ischial tuberosity support area of ​​the buttocks in real time, accurately calculate the center of gravity offset parameters during riding, provide objective data basis for balance training, and construct a monitoring system that matches the core physiological mechanism of balance ability.

[0025] 2. This utility model balance bike seat enables quantitative monitoring and dynamic evaluation of children's balance ability, providing quantifiable scientific guidance for children's balance training and filling the technical gap in objective evaluation in this field. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the balance scooter seat of this utility model;

[0027] Figure 2 This is a schematic diagram of the main control unit of this utility model.

[0028] Among them, 1: ergonomic seat cushion, 1-1: groove, 2: flexible pressure sensor unit, 2-1: flexible pressure sensor, 3: flexible cable. Detailed Implementation

[0029] The following is a detailed description of the balance scooter seat with balance force monitoring function according to the present invention, with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figure 1 As shown, a balance bike seat with balance force monitoring function includes: an ergonomic seat cushion 1, two sets of flexible pressure sensor units 2 and a main control unit. The ergonomic seat cushion can be designed based on the 3D scan data of the child's buttocks, so that its curved surface fits the child's buttocks with a degree of >97%, thereby improving riding comfort.

[0032] A groove 1-1 is formed on the centerline of the ergonomic seat. The length of the groove is set along the front-to-back direction of the ergonomic seat. A set of flexible pressure sensor units is embedded in the ergonomic seat on the left side of the groove, and a set of flexible pressure sensor units is embedded in the ergonomic seat on the right side of the groove. The two sets of flexible pressure sensor units are the left flexible pressure sensor unit and the right flexible pressure sensor unit. The two sets of flexible pressure sensor units are used to obtain the pressure of the user's buttocks on the ergonomic seat when riding. The main control unit is electrically connected to the two sets of flexible pressure sensor units through flexible ribbon cable 3 to obtain the pressure difference between the two sets of flexible pressure sensor units.

[0033] The working principle of the balance bike seat with balance force monitoring function is as follows: When riding, the pressure of the child's buttocks is applied to the left and right sides of the center line of the ergonomic seat. The main control unit obtains the pressure difference value of the two sets of flexible pressure sensor units. The pressure difference value can reflect the center of gravity shift and balance level during riding.

[0034] Example 2

[0035] A balance scooter seat with balance force monitoring function, based on embodiment 1, such as... Figure 2 As shown, the main control unit includes: MCU, analog-to-digital conversion module, wireless communication module, Wheatstone bridge, instrumentation amplifier and power module. The power module provides power to the MCU and Wheatstone bridge. In this embodiment, the power module uses a CR2032 button battery (capacity of 200mAh). With the MCU's sleep-wake mechanism (standby current ≤0.5μA), the battery life can reach 45 days.

[0036] The Wheatstone bridge is connected to two sets of flexible pressure sensor units respectively. Figure 2 (Not shown) Electrical connections are used to convert the resistance changes generated by each flexible pressure sensor unit into voltage signals (with a linear voltage range of 0-4V when the pressure detection range is 0-120N). The instrumentation amplifier is used to obtain the voltage signal output from the Wheatstone bridge, then differentially amplifies the voltage signal (60x gain) to output an analog signal, which is then transmitted to the analog-to-digital converter module. The instrumentation amplifier is chosen because it has significant advantages over differential amplifiers in terms of common-mode rejection ratio, input impedance, ease of gain adjustment, and noise immunity when amplifying weak, high-impedance voltage signals susceptible to strong common-mode interference.

[0037] The analog-to-digital converter (with 24-bit quantization precision) is used to convert analog signals into digital signals before sending them to the MCU; in this embodiment, the analog-to-digital converter uses a chip of model ADS1256.

[0038] The MCU is used to convert digital signals into pressure values ​​and then calculate the pressure difference (including timestamps) between the two sets of flexible pressure sensor units.

[0039] When a child rides a bicycle, the pressure of their buttocks on the ergonomic seat causes a change in the resistance of the flexible pressure sensor unit. This change is converted into a voltage signal by a Wheatstone bridge and sent to an instrumentation amplifier for amplification of the analog signal. The analog signal is then converted into a digital signal by an analog-to-digital converter and sent to the MCU for processing. The MCU calculates the pressure difference (ΔP) between the two sets of flexible pressure sensor units in real time.

[0040] Preferably, the MCU incorporates a median filter. The MCU can calculate the center-of-gravity offset distance using a pressure distribution mathematical model. Invalid data is filtered out by the median filter before being transmitted to the terminal device via the wireless communication module. The median filter employs a wavelet threshold denoising algorithm (3-level decomposition) combined with sliding window filtering to filter pressure differences and center-of-gravity offset distances, ensuring that the data for bumpy road surfaces is valid (>96%). In this embodiment, the MCU is an STM32L452 microcontroller. The wireless communication module uses Bluetooth with BLE 5.0.

[0041] In this embodiment, the formula for calculating the center of gravity offset distance S is: S = λ × ΔP, where λ is the individual calibration coefficient and ΔP is the pressure difference.

[0042] The terminal device can perform the following functions:

[0043] (1) Real-time dynamic display of the pressure difference between two sets of flexible pressure sensor units to form pressure curves and center of gravity offset trajectories.

[0044] (2) It has storage function and can generate professional reports according to training cycle, including core indicator comparison and high-risk action warning (such as when the continuous center of gravity shift distance exceeds 25mm).

[0045] (3) Based on machine learning algorithms, a balance development trend chart can be generated according to the child's age, training duration and ability assessment results, and a customized training plan can be pushed (e.g., it is recommended that 4-year-old children perform 10 minutes of straight-line cycling center of gravity control training every day).

[0046] The MCU is also connected to a motion state recognition module, which is a three-axis accelerometer (model LIS3DH). The MCU uses the motion state recognition module to determine the valid riding state (speed > 0.2m / s and attitude angle change > 3° / s) and can timestamp only the pressure data during the movement.

[0047] Example 3

[0048] A balance scooter seat with balance force monitoring function has two sets of flexible pressure sensor units symmetrically embedded in an ergonomic seat cushion at a spacing of 95-115mm, which matches the average spacing of children's ischial tuberosities.

[0049] Each flexible pressure sensor unit includes two pressure sensors 2-1, which are arranged along the edge of the groove. Each pressure sensor is a piezoresistive pressure sensor.

[0050] The pressure difference between the two sets of flexible pressure sensor units is determined in one of the following ways:

[0051] Method 1: The sum of the pressure values ​​of the two pressure sensors in one set of flexible pressure sensor units minus the sum of the pressure values ​​of the two pressure sensors in another set of flexible pressure sensor units.

[0052] Method 2: The pressure difference between the two front pressure sensors in the two sets of flexible pressure sensor units, and the pressure difference between the two rear pressure sensors in the two sets of flexible pressure sensor units.

[0053] The two pressure sensors in each flexible pressure sensor unit address the shortcomings of traditional single-point sensors in sensing pressure gradients. In this embodiment, the flexible pressure sensor measures 55mm × 35mm × 1.5mm (length × width × thickness), has a minimum bending radius of ≤8mm, and a linearity error of ≤±1.2% FS, precisely fitting the natural curvature of the hips of children aged 3 to 6 years.

[0054] In this embodiment, the flexible pressure sensor can be the flexible piezoresistive sensor 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 of this flexible piezoresistive sensor is a low-density melamine sponge (density of 10 mg / cm³). 3 The surface is covered with a medical-grade elastic silicone layer (0.7mm thick, Shore A42 hardness), which combines pressure sensitivity with skin contact safety.

[0055] The grooves on both sides of the ergonomic seat cushion are pressure-bearing areas for the ischial tuberosities. The grooves are supported by a hollow support frame (not shown in the figure) embedded within the ergonomic seat cushion. The hollow support frame is injection molded from high-strength, lightweight polypropylene (PP), and its surface is covered with a memory foam cushioning layer (4mm thick).

[0056] The ergonomic seat cushion features a mounting groove (60mm × 40mm × 2mm, depth dynamically adjusted to the curvature of the surface) on the surface where the flexible pressure sensor is installed. The edge of the mounting groove is rounded with a radius of 4mm to prevent stress concentration from affecting the lifespan of the flexible pressure sensor. The flexible pressure sensor is embedded in the mounting groove and encapsulated within it with silicone. The silicone surface above the flexible pressure sensor is covered with a breathable woven fiber layer (0.3mm pore size), ensuring signal transmission while improving comfort during long rides.

[0057] The method of encapsulating the flexible pressure sensor in the mounting groove with silicone is as follows: the flexible pressure sensor is fixed to the bottom of the mounting groove with medical-grade double-sided adhesive (peel strength ≥1.5N / cm), liquid silicone gel (Dow Corning OE-6640) is poured into the surface, and after curing at 65℃ for 2 hours, an integrated buffer conduction layer is formed.

[0058] Preferably, the flexible cable is led out from the cable outlet at the rear of the ergonomic seat cushion and connected to the main control unit using an IP67 waterproof connector.

[0059] 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 seat with a balance force monitoring function, characterized by, include: An ergonomic seat cushion (1), two sets of flexible pressure sensor units (2) and a main control unit are provided. A groove (1-1) is formed on the center line of the ergonomic seat cushion (1). The length direction of the groove (1-1) is set along the front-back direction of the ergonomic seat cushion (1). A set of flexible pressure sensor units (2) is embedded in the ergonomic seat cushion (1) on the left side of the groove (1-1) and a set of flexible pressure sensor units (2) is embedded in the ergonomic seat cushion (1) on the right side of the groove (1-1). The two sets of flexible pressure sensor units (2) are the left flexible pressure sensor unit and the right flexible pressure sensor unit. The two sets of flexible pressure sensor units (2) are used to obtain the pressure of the user's buttocks on the ergonomic seat cushion (1) when riding. The main control unit is electrically connected to the two sets of flexible pressure sensor units (2) through flexible ribbon cables (3) to obtain the pressure difference between the two sets of flexible pressure sensor units (2).

2. The balance car seat with balance force monitoring function according to claim 1, characterized in that, The main control unit includes: MCU, analog-to-digital converter module, wireless communication module, Wheatstone bridge, instrumentation amplifier and power supply module, wherein the power supply module provides power to MCU and Wheatstone bridge; The Wheatstone bridge is electrically connected to two sets of flexible pressure sensor units (2) respectively, and is used to convert the resistance value change generated by each set of flexible pressure sensor units (2) into a voltage signal. The instrumentation amplifier is used to obtain the voltage signal output by the Wheatstone bridge, and then output the voltage signal after differential amplification and transmit it to the analog-to-digital conversion module. The analog-to-digital converter module is used to convert analog signals into digital signals and then send them to the MCU; the MCU is used to convert digital signals into pressure values ​​and then calculate the pressure difference between the two sets of flexible pressure sensor units (2).

3. The balance scooter seat with balance force monitoring function according to claim 2, characterized in that, The MCU has a built-in median filter.

4. The balance scooter seat with balance force monitoring function according to claim 2, characterized in that, The MCU is also connected to a motion state recognition module, which is a three-axis accelerometer.

5. The balance scooter seat with balance force monitoring function according to claim 1, characterized in that, Two sets of flexible pressure sensor units (2) are symmetrically embedded in the ergonomic seat cushion (1) with a spacing of 95-115 mm.

6. The balance scooter seat with balance force monitoring function according to claim 1, characterized in that, Each flexible pressure sensor unit (2) includes two pressure sensors, and the two pressure sensors of the same flexible pressure sensor unit (2) are arranged along the edge of the groove (1-1).

7. The balance scooter seat with balance force monitoring function according to claim 6, characterized in that, The ergonomic seat cushion (1) has a mounting groove formed on the surface where the flexible pressure sensor (2-1) is installed. The edge of the mounting groove is rounded, and the flexible pressure sensor (2-1) is embedded in the mounting groove.

8. The balance scooter seat with balance force monitoring function according to claim 6, characterized in that, The minimum bending radius of the pressure sensor is ≤8mm, and the linearity error of the pressure sensor is ≤±1.2%.

9. The balance scooter seat with balance force monitoring function according to claim 7, characterized in that, The flexible pressure sensor (2-1) is encapsulated in a mounting groove with silicone, and the silicone surface above the flexible pressure sensor (2-1) is covered with a breathable woven fiber layer.

10. The balance scooter seat with balance force monitoring function according to claim 2, characterized in that, The MCU uses an STM32L452 microcontroller; the wireless communication module uses a Bluetooth BLE5.0.

Images