Grip-in-place detection system, grip assembly, and electric scooter

Abstract

The utility model provides a kind of handle in position detection system, handle assembly and electric scooter, handle in position detection system, comprising: signal excitation source, for generating fixed frequency ac signal;Sensing device, set in the surface of handle body, with resonant circuit electrical coupling, for when user holds handle body, introduce equivalent capacitance to resonant circuit;Resonant circuit, connect with signal excitation source, for the equivalent capacitance change resonant state by sensing device introduction;Sampling detection circuit, for detecting the output signal of resonant circuit, judge whether user holds handle body according to output signal, can carry out handle in position detection, and with the advantages of low cost, high reliability.

Description

Technical Field

[0001] This utility model relates to the field of electric mobility scooter technology, and in particular to a grip position detection system, grip assembly and electric mobility scooter. Background Technology

[0002] The handlebar is not only a core interactive component for users to operate the vehicle, but also an important functional component to ensure the safe operation of the vehicle. For example, if the user releases or does not hold the handlebar while the electric mobility scooter is in operation, it will trigger an emergency braking or engine shutdown mechanism to prevent accidents.

[0003] Electric mobility scooters typically face complex operating environments: prolonged exposure to harsh conditions such as vibration, moisture, and dust, and extremely high requirements for the durability of components and maintenance costs. Traditional grip position detection methods include integrating mechanical switches into the grip or brake lever, which suffers from poor reliability and short lifespan. Another grip position detection method uses a dedicated inductance-to-digital converter chip to detect grip pressure by measuring the change in inductance caused by the minute deformation of the sensor coil when it approaches the metal frame. This method relies on dedicated chips and is relatively expensive.

[0004] Therefore, there is an urgent need for a low-cost, high-reliability grip in-situ detection solution. Utility Model Content

[0005] This application provides a grip presence detection system, grip assembly, and electric mobility scooter, which provides a low-cost, highly reliable, and environmentally adaptable grip presence detection solution.

[0006] In a first aspect, this application provides a grip presence detection system, comprising:

[0007] A signal excitation source, used to generate AC signals at a fixed frequency;

[0008] A sensing device is disposed on the surface of the grip body and electrically coupled to the resonant circuit, which is used to introduce an equivalent capacitance to the resonant circuit when the user grips the grip body.

[0009] A resonant circuit, connected to a signal excitation source, is used to change the resonant state through the equivalent capacitance introduced by the sensing device.

[0010] The sampling and detection circuit is used to detect the output signal of the resonant circuit and determine whether the user is holding the grip body based on the output signal.

[0011] Optionally, the resonant circuit includes: a resonant network;

[0012] A resonant network is used to ensure a fixed resonant frequency when the user is not holding the grip body.

[0013] Optionally, the sensing device includes a first sensing device disposed on the left grip body and a second sensing device disposed on the right grip body. The resonant circuit further includes: a transformer; the primary coil of the transformer is connected to the resonant network, one end of the secondary coil of the transformer is connected to the first sensing device, and the other end of the secondary coil of the transformer is connected to the second sensing device.

[0014] The transformer is used to isolate the primary circuit of the resonant network from the secondary circuit consisting of the first sensing device, the second sensing device, and the human body.

[0015] Optionally, the resonant network can be a parallel resonant network;

[0016] Specifically, when the user is not holding the handle body with at least one hand, the output voltage of the resonant circuit detected by the sampling detection circuit is the first voltage; when the user holds the handle body with both hands respectively, the output voltage of the resonant circuit detected by the sampling detection circuit is the second voltage, which is less than the first voltage.

[0017] Optionally, the resonant network is a series resonant network;

[0018] Specifically, when the user is not holding the handle body with at least one hand, the output current of the resonant circuit detected by the sampling detection circuit is the first current; when the user holds the handle body with both hands respectively, the output current of the resonant circuit detected by the sampling detection circuit is the second current, which is less than the first current.

[0019] Optionally, the signal excitation source is a fixed-frequency AC signal generated by the microcontroller unit.

[0020] Optionally, the signal excitation source is a fixed-frequency sine wave signal generated by an automatically oscillating circuit, which is a circuit constructed from passive components.

[0021] Optionally, the sensing device includes a copper foil sensing layer, or a coil surrounded by copper wire.

[0022] Secondly, this application provides a grip assembly, including a grip presence detection system and a grip body according to any one of the first aspects.

[0023] Thirdly, this application provides an electric mobility scooter, including the handlebar assembly of the second aspect.

[0024] This utility model provides a grip position detection system, a grip assembly, and an electric mobility scooter. The grip position detection system includes: a signal excitation source for generating a fixed-frequency AC signal; a sensing device disposed on the surface of the grip body and electrically coupled to a resonant circuit for introducing an equivalent capacitance to the resonant circuit when the user grips the grip body; a resonant circuit connected to the signal excitation source for changing the resonant state through the equivalent capacitance introduced by the sensing device; and a sampling detection circuit for detecting the output signal of the resonant circuit and determining whether the user is gripping the grip body based on the output signal. This system enables grip position detection and has the advantages of low cost and high reliability. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 A schematic diagram of a grip presence detection system provided in this application;

[0027] Figure 2 A schematic diagram of another grip presence detection system provided in this application.

[0028] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0030] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 utility model and are not intended to limit the present utility model. To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] 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.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model 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 utility model.

[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 utility model, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0034] The specific application scenario of this application is: when a user is riding an electric mobility scooter, the system detects whether the user is holding the handlebars, and then performs corresponding controls based on the detection results.

[0035] In the automotive industry, the steering wheel environment is relatively stable, and hands-off detection technology is quite mature. It typically employs complex capacitive sensor arrays or multimodal integrated sensing and recognition methods, such as visual recognition and pressure detection. For example, it's used for hands-off detection in advanced driver assistance systems. While these solutions are accurate, their complex structure and high cost make them unsuitable for two-wheeled or three-wheeled vehicles where cost is a primary concern and a streamlined installation is required.

[0036] In applications such as electric vehicles or motorcycles, traditional detection methods mainly rely on mechanical switches, Hall effect sensors, and inductive sensors.

[0037] Mechanical switches refer to integrating microswitches into the grip or brake lever. This solution has a simple structure, but it has obvious drawbacks, such as being prone to mechanical wear and contact oxidation after long-term use, and being sensitive to environmental factors such as water and dust, resulting in poor reliability and short lifespan.

[0038] Hall effect sensors are primarily used to detect rotational angles, such as in electronic throttle grips or power-adjustable levers. These sensors require the use of magnets and precise mechanical alignment. They are designed to measure rotational displacement rather than static "in-place" states, and therefore are not directly applicable to simple grip detection.

[0039] Some advanced solutions employ dedicated inductor-to-digital converter chips, detecting grip pressure by measuring the change in inductance caused by minute deformation of the sensor coil when it approaches the metal frame. This approach offers excellent performance but relies on specialized and relatively expensive integrated circuits and may require sophisticated mechanical design to ensure detectable deformation.

[0040] Currently, in the fields of two-wheeled electric vehicles, motorcycles, scooters, and ebikes (electric bicycles), grip position detection solutions need to meet the characteristics of non-contact operation, high reliability, strong environmental adaptability (i.e., anti-interference), simple structure, and low cost in order to meet the needs of large-scale production and application.

[0041] The grip presence detection system, grip assembly, and electric mobility scooter provided in this application are designed to meet the above-mentioned requirements.

[0042] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0043] Figure 1 A schematic diagram of a grip presence detection system provided in this application is shown below. Figure 1 As shown, the grip presence detection system includes:

[0044] Signal excitation source 101 is used to generate AC signals of a fixed frequency;

[0045] The sensing device 102 is disposed on the surface of the grip body and electrically coupled to the resonant circuit 103, and is used to introduce an equivalent capacitance to the resonant circuit 103 when the user grips the grip body.

[0046] The resonant circuit 103 is connected to the signal excitation source 101 and is used to change the resonant state through the equivalent capacitance introduced by the sensing device 102.

[0047] The sampling and detection circuit 104 is used to detect the output signal of the resonant circuit 103 and determine whether the user is holding the grip body based on the output signal.

[0048] Optionally, the signal excitation source 101 is used to generate a fixed frequency AC signal, which serves as the input excitation for the entire system, i.e., the detection reference of the grip presence detection system.

[0049] Optionally, the sensing device 102 is disposed on the surface of the grip body and electrically coupled to the resonant circuit 103. When the user grips the grip body, the equivalent capacitance of the human body can be introduced into the resonant circuit 103. The resonant circuit 103 is connected to the signal excitation source 101. The resonant state of the resonant circuit 103 is affected by the equivalent capacitance introduced by the sensing device 102. When the equivalent capacitance is introduced, the resonant frequency or impedance characteristics of the resonant circuit 103 change accordingly, thereby causing a change in the resonant state.

[0050] Optionally, when the resonance state of the resonant circuit 103 changes, the impedance of the resonant circuit 103 changes, that is, the impedance when resonance occurs is different from the impedance when resonance does not occur, which can affect the output signal of the resonant circuit 103. The sampling and detection circuit 104 is used to detect the output signal of the resonant circuit 103. By analyzing the amplitude characteristics of the output signal, it is determined whether the user is holding the grip body.

[0051] For example, the resonant circuit 103 can be configured such that when the user is not holding the grip body, the resonant frequency is the same as the fixed frequency of the AC signal generated by the signal excitation source 101, thus causing resonance, and the output signal of the resonant circuit 103 is the first signal; when the user holds the grip body, the resonant frequency changes and is no longer the fixed frequency, thus not causing resonance, and the output signal of the resonant circuit 103 is the second signal. Therefore, when the output signal collected by the sampling detection circuit 104 is the second signal, it can be determined that the user is holding the grip body.

[0052] The resonant circuit 103 is generally composed of inductor and capacitor elements, and its resonant frequency is related to the total capacitance value in the circuit. When the user holds the handle, the sensing device 102 introduces an equivalent capacitance, which causes the resonant frequency to change, thereby changing the voltage or current signal output by the resonant circuit.

[0053] Optionally, the sampling and detection circuit 104 may include signal conditioning, analog-to-digital conversion, and logic judgment modules, which can acquire the output of the resonant circuit 103 in real time and accurately identify changes in the holding state by comparing the output of the comparison circuit with a preset threshold.

[0054] For example, during operation, the signal excitation source 101 continuously provides a fixed-frequency AC signal to the resonant circuit 103. When the user is not holding the handle, the resonant circuit 103 is in a resonant state, outputting a signal of a specific amplitude. When the user holds the handle, the sensing device 102 introduces an equivalent capacitance due to human contact, causing a change in the resonant characteristics of the resonant circuit 103, resulting in a change in the amplitude of the output signal. The sampling and detection circuit 104 monitors this change in real time. When a specific change in the output signal is detected, it is determined to be a user-held state; otherwise, it is a non-held state. This system indirectly detects human contact through changes in the resonant state, featuring high sensitivity and strong anti-interference capabilities, and is suitable for various human-computer interaction devices that require grip detection.

[0055] By altering the system's resonant frequency through changes in the capacitance of the grip, the output signal is changed to ultimately achieve the detection target. This application eliminates the need for any external sensor chip, significantly reducing material costs and production complexity. Furthermore, as a purely electronic solution without any moving parts, it fundamentally eliminates mechanical wear issues and possesses inherent resistance to harsh environmental factors such as vibration, moisture, and dust, exhibiting robustness, durability, and strong environmental adaptability. This application can optimize the quality factor (Q value) of the resonant circuit, thereby reliably detecting minute capacitance changes generated when a human hand touches the grip, measuring capacitance changes at the pF level, thus achieving accurate presence detection with high reliability.

[0056] This utility model provides a grip position detection system, a grip assembly, and an electric mobility scooter. The grip position detection system includes: a signal excitation source 101 for generating a fixed frequency AC signal; a sensing device 102 disposed on the surface of the grip body and electrically coupled to a resonant circuit 103 for introducing an equivalent capacitance to the resonant circuit 103 when the user grips the grip body; a resonant circuit 103 connected to the signal excitation source 101 for changing the resonant state through the equivalent capacitance introduced by the sensing device 102; and a sampling detection circuit 104 for detecting the output signal of the resonant circuit 103 and determining whether the user is gripping the grip body based on the output signal. This system enables grip position detection and has the advantages of low cost and high reliability.

[0057] Figure 2 A schematic diagram of another grip presence detection system provided in this application.

[0058] Optionally, the resonant circuit 103 includes: a resonant network 1031;

[0059] The resonant network 1031 is used to ensure that the resonant frequency is fixed when the user is not holding the grip body.

[0060] Optionally, the resonant network 1031 may include a capacitor and an inductor. Optionally, the values ​​of the inductor and capacitor can be set so that the resonant frequency of the resonant network 1031 is consistent with the fixed frequency of the AC signal output by the signal excitation source, so that when the user is not holding the grip body, no equivalent capacitance is introduced, and the resonant circuit 103 can resonate.

[0061] Optionally, the sensing device 102 includes a first sensing device 1021 disposed on the left grip body and a second sensing device 1022 disposed on the right grip body. The resonant circuit 103 further includes a transformer 1032; the primary coil of the transformer 1032 is connected to the resonant network 1031, one end of the secondary coil of the transformer 1032 is connected to the first sensing device 1021, and the other end of the secondary coil of the transformer 1032 is connected to the second sensing device 1022.

[0062] Transformer 1032 is used to isolate the primary side circuit where the resonant network 1031 is located from the secondary side circuit consisting of the first sensing device 1021, the second sensing device 1022 and the human body.

[0063] To improve the safety and anti-interference performance of the grip position detection system, a transformer 1032 is added to the resonant circuit 103. The primary coil of the transformer 1032 is connected to the aforementioned resonant network 1031 to form the primary side circuit; one end of the secondary coil is connected to the first sensing device 1021, and the other end is connected to the second sensing device 1022.

[0064] Optionally, the transformer 1032 can serve as an electrical isolation device, separating the primary circuit containing the resonant network 1031 from the secondary circuit formed by the first sensing device 1021, the second sensing device 1022, and the human body. This electrical isolation effectively prevents signal interference from the primary circuit from affecting the secondary side. More importantly, it prevents potentially high voltages or currents in the primary circuit from directly passing through the user's body, thus significantly improving safety.

[0065] During operation, the transformer 1032 is also part of the resonant circuit 103. When the user does not hold the handle, the resonant circuit 103 resonates at the resonant frequency. Specifically, the resonance at the resonant frequency can be achieved by configuring the turns ratio of the primary and secondary coils of the transformer 1032 and the values ​​of the inductance and capacitance in the resonant network 1031.

[0066] When a user simultaneously holds both grips, the first sensing device 1021 and the second sensing device 1022 are connected through an equivalent human body capacitance, thus forming a closed induction loop in the secondary coil of the transformer. At this time, the resonant frequency of the resonant circuit 103 shifts. That is, resonance can occur when no grip is held; when the user holds only one grip, a closed induction loop cannot be formed in the secondary coil, so resonance still occurs; when both grips are held, the resonant frequency is not fixed, and therefore the fixed-frequency AC signal output from the signal excitation source 101 will not resonate. Thus, the output signal of the resonant circuit 103 changes in both of these situations.

[0067] The sampling and detection circuit 104 determines whether the user has completed the gripping action by monitoring the changes in the output signal of the resonant circuit 103. This is suitable for detecting whether both hands are operating the grip body simultaneously. The transformer 1032, while acting as a resonant device, also provides isolation, ensuring high safety and reducing the risk of electric shock.

[0068] This application provides a detailed description of the type of resonant network 1031 and its detection logic under different holding states.

[0069] Optionally, the resonant network 1031 is a parallel resonant network;

[0070] Specifically, when the user is not holding the handle body with at least one hand, the output voltage of the resonant circuit 103 detected by the sampling detection circuit 104 is the first voltage; when the user holds the handle body with both hands respectively, the output voltage of the resonant circuit 103 detected by the sampling detection circuit 104 is the second voltage, which is less than the first voltage.

[0071] Optionally, the parallel resonant network exhibits high impedance characteristics at the resonant frequency, while its impedance decreases significantly when the frequency deviates from the resonant frequency.

[0072] During operation, the signal excitation source 101 applies a fixed-frequency AC signal to the parallel resonant network. When at least one hand of the user is not holding the handle body, it means that the secondary circuit formed by the first sensing device 1021, the second sensing device 1022, and the human body is in an open circuit or high-impedance state. At this time, the resonant network 1031 is able to maintain near its inherent resonant state. Due to its high impedance characteristics, a high-amplitude sinusoidal voltage is induced in the resonant circuit. Therefore, the output voltage of the resonant circuit 103 detected by the sampling detection circuit 104 is a relatively high value, namely the first voltage.

[0073] When a user firmly grips the left and right handles with both hands, their body effectively connects the two ends of the transformer's secondary coil through the first induction device 1021 and the second induction device 1022, forming a complete electrical circuit. This significantly increases the total capacitance of the resonant circuit 103. The resonant frequency shifts due to the change in total capacitance, causing the resonant circuit 103 to deviate from its resonant state. The output sine wave also becomes detuned, and the impedance of the resonant circuit decreases. With the output current of the signal excitation source 101 remaining essentially constant, the voltage across the resonant circuit 103 will decrease.

[0074] Therefore, the output voltage detected by the sampling detection circuit 104 will drop to a lower value, namely the second voltage, which is significantly lower than the aforementioned first voltage. By monitoring the magnitude of the output voltage in real time and comparing it with a preset voltage threshold, the sampling detection circuit 104 can accurately determine whether the user's hands are gripping the handle.

[0075] Optionally, the resonant network is a series resonant network;

[0076] Specifically, when the user is not holding the handle body with at least one hand, the output current of the resonant circuit 103 detected by the sampling detection circuit 104 is the first current; when the user holds the handle body with both hands respectively, the output current of the resonant circuit 103 detected by the sampling detection circuit 104 is the second current, and the second current is less than the first current.

[0077] Optionally, the series resonant network exhibits low impedance characteristics at its resonant frequency, allowing a larger current to pass through. However, when the operating frequency deviates from its resonant frequency, its impedance increases, resulting in a decrease in the loop current.

[0078] Optionally, during operation, the signal excitation source 101 provides a fixed-frequency AC signal to the series resonant network. When at least one hand of the user is not holding the handle body, the secondary circuit formed by the first sensing device 1021, the second sensing device 1022, and the human body is in an open-circuit or high-impedance state. At this time, the series resonant network operates in its inherent resonant state, and its equivalent impedance reaches its minimum. Therefore, with the output voltage of the signal excitation source 101 constant, the total current flowing through the resonant circuit reaches its maximum, and the output current detected by the sampling detection circuit 104 is a large value, namely the first current.

[0079] Optionally, when the user holds the left and right grips respectively with both hands, a closed secondary loop is formed, causing a shift in the resonant frequency of the series resonant network. This results in an increase in its impedance at the fixed operating frequency of the signal excitation source 101. Due to the increased total impedance of the loop, the total current flowing through the series resonant network decreases while the excitation voltage remains constant. Therefore, the output current detected by the sampling and detection circuit 104 will drop to a lower value, namely the second current, which is significantly smaller than the aforementioned first current.

[0080] Optionally, the sampling and detection circuit 104 can accurately identify the user's change from a non-holding state to a two-handed holding state by real-time monitoring and determining whether the output current decreases from the first current to the second current.

[0081] Optionally, the signal excitation source 101 is a fixed-frequency AC signal generated by the microcontroller unit.

[0082] The microcontroller unit generates a highly stable AC signal through its integrated timer and digital-to-analog converter functions, or through pulse width modulation output after filtering.

[0083] Using a microcontroller unit as the signal excitation source 101 offers advantages such as high integration and flexible control. The system eliminates the need for additional independent oscillation circuit hardware, simplifying the overall structure. Furthermore, directly using the microcontroller unit to generate the excitation source allows for low overall power consumption, making it suitable for energy-sensitive battery-powered vehicles.

[0084] Optionally, the signal excitation source 101 is a fixed-frequency sine wave signal generated by an automatically oscillating circuit, and the oscillating circuit is a circuit constructed from passive components.

[0085] Optionally, passive devices can be electronic components such as resistors, capacitors, inductors, and transformers that do not have amplification functions and do not require an external DC power supply.

[0086] Optionally, during operation, the oscillation circuit utilizes the positive feedback network formed by its internal passive components to spontaneously generate and maintain periodic oscillations at a specific frequency after power-on, without relying on an external digital clock source or active amplifier device to start or maintain the oscillation.

[0087] An automatic oscillation circuit constructed from passive components has significant advantages such as simple structure, low cost, and high reliability.

[0088] Optionally, the sensing device 102 may include a copper foil sensing layer or a coil surrounded by copper wire.

[0089] The sensing device 102 may be a copper foil sensing layer or a coil surrounded by copper wire, and arranged on the grip surface. Its function is to maintain a fixed capacitance when the user is not holding the grip, while the total equivalent capacitance increases when the user is holding the grip.

[0090] This application utilizes capacitance changes to shift the resonant point, thereby altering the output waveform. After the capacitance change, the signal conversion processes within the circuit remain highly stable, virtually unaffected by external factors. This avoids the problems of traditional capacitance sensing chips being overly sensitive, difficult to systemically shield, and susceptible to interference from complex environmental factors. Furthermore, this application boasts strong circuit compatibility; the circuit can be ported to various circuit boards, transmitting the signal from the sensing device to the resonant circuit via wires. Mechanical assembly is simplified, requiring only a copper foil sensing layer on the grip, avoiding the assembly design difficulties and complexity associated with complex components.

[0091] This utility model also provides a grip assembly, including the grip presence detection system and grip body of the foregoing embodiments.

[0092] This utility model also provides an electric mobility scooter, including the handle assembly of the aforementioned embodiment.

[0093] Optional electric mobility scooters can be electric two-wheelers, electric scooters, balance bikes, electric-assisted bikes, electric bicycles, etc.

[0094] The electric mobility scooter provided in this application can detect whether the user's hands are holding the handlebars.

[0095] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0098] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A grip presence detection system, characterized in that, include: A signal excitation source, used to generate AC signals at a fixed frequency; A sensing device is disposed on the surface of the grip body and electrically coupled to the resonant circuit, for introducing an equivalent capacitance to the resonant circuit when the user grips the grip body. A resonant circuit, connected to the signal excitation source, is used to change the resonant state through the equivalent capacitance introduced by the sensing device. A sampling detection circuit is used to detect the output signal of the resonant circuit and determine whether the user is holding the grip body based on the output signal.

2. The grip-in-place detection system of claim 1, wherein The resonant circuit includes: a resonant network; The resonant network is configured to resonate at the fixed frequency when the user is not holding the grip body.

3. The grip-in-place detection system of claim 2, wherein The sensing device includes a first sensing device disposed on the left grip body and a second sensing device disposed on the right grip body. The resonant circuit further includes a transformer; the primary coil of the transformer is connected to the resonant network, one end of the secondary coil of the transformer is connected to the first sensing device, and the other end of the secondary coil of the transformer is connected to the second sensing device. The transformer is used to isolate the primary side circuit where the resonant network is located from the secondary side circuit consisting of the first sensing device, the second sensing device, and the human body.

4. The grip-in-place detection system of claim 2, wherein The resonant network is a parallel resonant network; Specifically, when the user is not holding the grip body with at least one hand, the output voltage of the resonant circuit detected by the sampling detection circuit is a first voltage; when the user holds the grip body with both hands respectively, the output voltage of the resonant circuit detected by the sampling detection circuit is a second voltage, and the second voltage is less than the first voltage.

5. The grip-in-place detection system of claim 2, wherein The resonant network is a series resonant network; Specifically, when the user is not holding the grip body with at least one hand, the output current of the resonant circuit detected by the sampling detection circuit is the first current; when the user holds the grip body with both hands respectively, the output current of the resonant circuit detected by the sampling detection circuit is the second current, and the second current is less than the first current.

6. A grip-in-place detection system according to any one of claims 1-5, characterized in that The signal excitation source is a fixed-frequency AC signal generated by the microcontroller unit.

7. The grip presence detection system according to any one of claims 1-5, characterized in that, The signal excitation source is a fixed-frequency sine wave signal generated by an automatically oscillating circuit, which is a circuit constructed from passive components.

8. A grip-in-place detection system according to any one of claims 1-5, characterized in that The sensing device includes a copper foil sensing layer, or a coil surrounded by copper wire.

9. A grip assembly characterized by, include: The grip presence detection system and grip body according to any one of claims 1-8.

10. An electrically powered mobility scooter, characterized in that Includes the grip assembly as described in claim 9.

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