Electric bicycle and control system thereof

Abstract

This disclosure provides an electric bicycle and its control system. The control system includes a sensing module, a drive module, and a control module. The drive module is connected to both the sensing module and the control module, and the sensing module and control module are communicatively connected. The drive module provides power to the electric bicycle. The sensing module detects the drive module and generates corresponding torque feedback signals and speed feedback signals. The control module controls the output power of the drive module based on the torque and speed feedback signals. This disclosure improves the control algorithm of the drive module based on the torque and speed feedback signals, achieving precise control and adjustment. It employs a compact design and high-quality hardware components, along with a reliable battery management system and intelligent charging control functions, achieving powerful performance and efficient energy consumption control. This allows users to use electric bicycles more conveniently and safely, providing consumers with a more convenient, comfortable, and environmentally friendly mode of transportation.

Description

Technical Field

[0001] This disclosure relates to the field of electric bicycle technology, and in particular to an electric bicycle and its control system. Background Technology

[0002] The control system of an electric bicycle typically includes multiple components, such as a motor controller, battery management system, and sensors. These components need to communicate and coordinate with each other to ensure the normal operation of the control system. Because of the large number of components in the control system, it is difficult to integrate them inside the electric bicycle frame, resulting in a large control system size. This affects the overall aesthetics and user experience of the electric bicycle. Furthermore, the complex communication and coordination between components increases the complexity of the control system and the likelihood of malfunctions.

[0003] Furthermore, electric bicycles on the market are mainly divided into two types: electric-assist and electric-push. The control system of an electric-assist type primarily controls the motor's output power by sensing the rider's pedaling force. The control system of an electric-push type primarily controls the motor's output power by sensing the wheel speed. Existing control systems struggle to precisely adjust the motor's output power, resulting in unstable power output and significant performance fluctuations in the control system under different environments. This not only affects the riding experience but also shortens the motor's lifespan. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides an electric bicycle and its control system.

[0005] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0006] In a first aspect, this disclosure provides a control system for an electric bicycle, the control system including a sensing module, a drive module and a control module, the drive module being connected to the sensing module and the control module respectively, and the sensing module being communicatively connected to the control module;

[0007] The drive module is used to provide power to the electric bicycle;

[0008] The sensing module is used to detect the driving module and generate corresponding torque feedback signals and speed feedback signals;

[0009] The control module is used to control the output power of the drive module based on the torque feedback signal and the speed feedback signal.

[0010] Optionally, the control module is used to input the torque feedback signal and the speed feedback signal into a preset model to obtain the target output power, and control the drive module to adjust to the target output power;

[0011] The preset model is obtained by fitting a first control curve and a second control curve. The first control curve represents the first output power corresponding to different torque feedback signals, and the second control curve represents the second output power corresponding to different speed feedback signals.

[0012] Optionally, the first control curve is a sinusoidal static curve, and / or the second control curve is a PID (Proportional-Integral-Derivative) dynamic curve.

[0013] Optionally, the control system further includes a status display module, which is communicatively connected to the control module;

[0014] The status display module is used to obtain and display the status information of the electric bicycle from the control module.

[0015] The status information includes at least one of the following: battery level, mileage, assist level, and pace information of the electric bicycle.

[0016] Optionally, the control system further includes a power supply module and a battery management module connected to the power supply module;

[0017] The battery management module is communicatively connected to the control module;

[0018] The battery management module is used to monitor and manage the power supply module;

[0019] The control module is also used to obtain the power information of the power supply module through the battery management module.

[0020] Optionally, the control system further includes a mileage recording module for recording the mileage information, the control module being communicatively connected to the mileage recording module, and the control module also being used to receive the mileage information;

[0021] And / or, the control module is further configured to generate a boost level based on the target output power, and to generate the pacing information based on the speed feedback signal.

[0022] Optionally, the power supply module includes at least two power supply units.

[0023] Optionally, the control system further includes a wireless communication module for establishing a communication connection with the target device.

[0024] Optionally, the control system further includes an interaction module, which is communicatively connected to the control module;

[0025] The interaction module is used to receive user operations and generate corresponding operation instructions;

[0026] The control module is used to receive the operation instructions and perform corresponding operations according to the operation instructions.

[0027] Optionally, the control system further includes a mobile application, which is communicatively connected to the control module;

[0028] The control module is communicatively connected to the wireless communication module;

[0029] The control module is used to send the status information of the electric bicycle to the mobile application in the target device through the wireless communication module;

[0030] The mobile application is used to receive and display the status information.

[0031] Optionally, the control module is a six-tube controller, and the drive module is a brushless three-phase DC motor.

[0032] Secondly, this disclosure provides an electric bicycle, including the control system described in the first aspect.

[0033] The positive advancements of this disclosure lie in: simultaneously controlling the output power of the drive module based on torque and speed feedback signals, improving the drive module's control algorithm, and achieving precise control and adjustment. Furthermore, by employing a compact design and high-quality hardware components, along with a reliable battery management system and intelligent charging control functions, it achieves powerful performance and efficient energy consumption control, allowing users to use electric bicycles more conveniently and safely, and providing consumers with a more convenient, comfortable, and environmentally friendly mode of transportation. Attached Figure Description

[0034] Figure 1 A schematic diagram of the first module of a control system for an electric bicycle provided in an embodiment of this disclosure;

[0035] Figure 2 This is a schematic diagram of the second module of a control system for an electric bicycle provided in an embodiment of this disclosure. Detailed Implementation

[0036] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0037] It should be noted that if the embodiments of this disclosure involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0038] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this disclosure.

[0039] This disclosure provides a control system for an electric bicycle, such as... Figure 1 As shown, it includes a sensing module 101, a driving module 102, and a control module 103. The driving module 102 is connected to both the sensing module 101 and the control module 103, and the sensing module 101 and the control module 103 are communicatively connected.

[0040] The drive module 102 is used to provide power to the electric bicycle; the sensing module 101 is used to detect the drive module 102 and generate corresponding torque feedback signals and speed feedback signals; the control module 103 is used to control the output power of the drive module 102 according to the torque feedback signals and speed feedback signals.

[0041] As a feasible implementation method, the control module 103 is used to input the torque feedback signal and the speed feedback signal into the preset model to obtain the target output power, and control the drive module 102 to adjust to the target output power.

[0042] The preset model is obtained by fitting a first control curve and a second control curve. The first control curve represents the first output power corresponding to different torque feedback signals. The second control curve represents the second output power corresponding to different speed feedback signals.

[0043] Specifically, a torque-power output model can be built based on the torque feedback signal and the output power of the drive module 102 to obtain the first control curve.

[0044] For example, a sine wave static curve is used as the first control curve to control the output power. The rotation of the electric bicycle pedals in one revolution is defined as two cycles. In the first cycle, the process of one pedal being depressed from its highest position to its middle position corresponds to the sine wave static curve rising from its lowest point to its highest point, meaning the output power increases slowly. The process of one pedal being depressed from its middle position to its lowest position corresponds to the sine wave static curve falling from its highest point to its lowest point, meaning the output power decreases slowly. Immediately afterwards, the other pedal applies force to enter the second cycle.

[0045] By using the above-mentioned sinusoidal static curve to control the output power of the drive module 102, efficient operation can be achieved by precisely matching the phase current and voltage of the drive module 102, thereby reducing energy waste, making the electric bicycle more energy-efficient, avoiding jerking during riding, making riding smoother, providing a smoother and higher-performance riding experience, and better matching the rider's needs.

[0046] A speed-power output model can also be built based on the speed feedback signal and the output power of the drive module 102 to obtain the second control curve.

[0047] For example, a PID control curve is used as the second control curve to control the output power. When the electric bicycle is in assist mode, PID control maintains the overall speed of the electric bicycle consistent with the set speed of assist mode. When the load increases due to climbing, changes in road surface, or increased wind resistance, the output power is increased until the set overall speed is reached. Similarly, when going downhill or on uneven road surfaces, the output power is reduced until the overall speed reaches the set speed of assist mode.

[0048] By employing the aforementioned PID control dynamic curve, the system can quickly respond to changes in the speed feedback signal, ensuring that the overall speed of the electric bicycle remains near the desired set speed without significant speed fluctuations. It also allows for rapid acceleration or deceleration to adapt to different riding conditions, increasing riding flexibility. This precise control of the electric bicycle contributes to improved riding smoothness and comfort.

[0049] By fitting the first and second control curves, a preset model for controlling the output power of the drive module 102 in this embodiment of the present disclosure can be obtained. That is, the output power of the drive module 102 is controlled by comprehensively considering the torque feedback signal and the speed feedback signal, so as to make the assist closed-loop control more perfect, optimize the energy utilization efficiency of the electric bicycle, extend the riding time and battery life, make riding smoother, and improve the comfort and stability of riding.

[0050] As a feasible implementation, the control system also includes a status display module, which is communicatively connected to the control module 103. The status display module is used to acquire and display the status information of the electric bicycle from the control module 103. The status information includes at least one of the following: battery level, mileage, assist level, and pace information.

[0051] Specifically, the control system may include a power supply module and a battery management module. The battery management module is connected to the power supply module to monitor and manage it. The battery management module is communicatively connected to the control module 103, and the control module 103 can obtain the power information of the power supply module through the battery management module.

[0052] The power supply module can employ at least two power supply units, such as two or more battery banks. For example, equal charging and discharging of the two battery banks can significantly increase the electric bicycle's range. When one battery bank is depleted, the system can switch to the second battery bank, thereby extending the riding distance. This is particularly useful for long-distance riding or situations requiring additional power.

[0053] The control system may also include a mileage recording module for recording mileage information. The control module 103 is communicatively connected to the mileage recording module and is also used to receive mileage information. Furthermore, the control module 103 may also be used to generate a power assist level based on the target output power and to generate pace information based on the speed feedback signal.

[0054] As a possible implementation method, the control system also includes a wireless communication module, which is used to establish a communication connection with the target device.

[0055] Furthermore, the control system also includes a mobile application, which is communicatively connected to the control module 103. The control module 103 is communicatively connected to a wireless communication module, and can be used to send the status information of the electric bicycle to the mobile application in the target device via the wireless communication module; the mobile application is used to receive and display the status information.

[0056] For example, the mobile application can be an app on a mobile phone, through which users can record riding data, view historical riding records, view battery information, and various status information of the electric bicycle.

[0057] As a feasible implementation method, the control system also includes an interaction module, which is communicatively connected to the control module 103. The interaction module is used to receive user operations and generate corresponding operation instructions. The control module 103 is used to receive operation instructions and execute corresponding operations according to the operation instructions.

[0058] For example, the interaction module is a button panel, which is typically located on the handlebars or other easily accessible location on an electric bicycle. Users can perform various control and operation functions by triggering different buttons on the button panel.

[0059] For example, a control panel can be used to switch between different levels of electric assist, typically including high, medium, low, and off. Different levels provide varying degrees of electric assist, affecting riding speed and difficulty. Additionally, the control panel may include an alarm or horn button to emit an audible signal to alert other road users or attract attention.

[0060] The control system of the electric bicycle described above will be further explained below with a specific example:

[0061] The control system 100 in this specific example is as follows: Figure 2 As shown, it includes a smart central Bluetooth instrument panel 104, a button panel 105, an electric drive controller 103, a motor 102, a brake lever, a sensor 101, headlights, taillights, two battery packs 106, and an APP 301 in a mobile phone 300.

[0062] Specifically, in the control system 100 of this specific example, the sensing module is a sensor 101 that can collect torque feedback signals and speed feedback signals, the drive module is a motor 102, the control module is an electric drive controller 103, the status display module 1042 and the wireless communication module 1041 are integrated into an intelligent Bluetooth instrument 104, and the power supply module and battery management module are two battery packs 106.

[0063] The electric drive controller 103 employs a six-transistor controller capable of driving a brushless DC three-phase motor 102, adjusting the motor's output power based on torque and speed feedback signals. Furthermore, the electric drive controller 103 can also achieve overall control of the electric bicycle 200, such as controlling the headlights and taillights, and the sensor 101 (connected to the headlights and taillights). In addition, the electric drive controller 103 can communicate with the intelligent central Bluetooth instrument panel 104 for more precise and faster control.

[0064] In the intelligent centrally located Bluetooth instrument panel 104, the wireless communication module 1041 uses Bluetooth communication technology to send the status information of the electric bicycle 200 to the APP 301 on the mobile phone 300. Users can then perform operations such as data recording, viewing historical data, viewing battery information, viewing controller information, and viewing instrument information through the APP 301.

[0065] The status display module 1042 displays battery information, the version number of the control system 100, mileage information, assist level, pace information, and Bluetooth connection status. The status display module 1042 can use a 2.0-inch high-brightness 1000cd LCD (Liquid Crystal Display) as its display screen, which features high brightness, clarity, and low power consumption. The wireless communication module 1041 in the intelligent central Bluetooth instrument cluster 104 can employ Bluetooth communication technology.

[0066] Furthermore, the housing of the Smart Center Bluetooth Instrument 104 can be made of high-quality materials that are durable and waterproof. For example, the Smart Center Bluetooth Instrument 104 is equipped with a USB (Universal Serial Bus) interface, which, together with a waterproof rubber plug, can prevent water from entering and damaging the Smart Center Bluetooth Instrument 104.

[0067] Motor 102 can be selected from Chuanke RN-04 motor 102. This model of motor 102 has the characteristics of rapid feedback, stable braking, low noise and long service life.

[0068] The sensor 101 can be a large-sized torque sensor with speed sensing from Morten, which has torque and speed feedback functions. This sensor 101 can monitor the motion status of the electric bicycle 200 in real time, providing more accurate feedback information to the electric drive controller 103, thereby achieving more precise control.

[0069] The two battery packs 106 can each be equipped with a BMS (Battery Management System), and by equalizing the charging and discharging of the two batteries, the range of the electric bicycle 200 can be greatly improved.

[0070] The control system 100 of the aforementioned electric bicycle 200 incorporates various technological elements, including a smart centrally located Bluetooth instrument panel 104, an APP 301 from a mobile phone 300, and a keypad 105. The combination of the electric drive controller 103 and the motor 102 provides powerful performance, offering ample power, high braking stability, and rapid speed adjustment, meeting consumers' demands for high performance and high reliability in the electric bicycle 200's control system 100. Furthermore, the selected sensor 101 provides torque and speed feedback, enabling the control system 100 to more accurately perceive the electric bicycle 200's motion status and the user's operational intentions. Simultaneously, the control system 100 utilizes two battery packs 106 with high energy density and long service life, significantly improving the electric bicycle 200's range through balanced charging and discharging, further enhancing its safety and stability.

[0071] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A control system for an electric bicycle, characterized in that, The control system includes a sensing module, a driving module, and a control module. The driving module is connected to both the sensing module and the control module, and the sensing module and the control module are communicatively connected. The drive module is used to provide power to the electric bicycle; The sensing module is used to detect the driving module and generate corresponding torque feedback signals and speed feedback signals; The control module is used to control the output power of the drive module according to the torque feedback signal and the speed feedback signal; The control module is used to input the torque feedback signal and the speed feedback signal into a preset model to obtain the target output power, and control the drive module to adjust to the target output power; The preset model is obtained by fitting a first control curve and a second control curve. The first control curve represents the first output power corresponding to different torque feedback signals, and the second control curve represents the second output power corresponding to different speed feedback signals. The first control curve is a static sinusoidal curve, and the second control curve is a dynamic PID control curve. The electric bicycle's pedals rotate in two cycles. In the first cycle, the process of one pedal being pressed down from its highest position to its middle position corresponds to the sine wave static curve rising from its lowest point to its highest point, with the output power slowly increasing. The process of one pedal being pressed down from its middle position to its lowest position corresponds to the sine wave static curve falling from its highest point to its lowest point, with the output power slowly decreasing. Then, the other pedal is pressed down to enter the second cycle.

2. The control system according to claim 1, characterized in that, The control system further includes a status display module, which is communicatively connected to the control module. The status display module is used to obtain and display the status information of the electric bicycle from the control module. The status information includes at least one of the following: battery level, mileage, assist level, and pace information of the electric bicycle.

3. The control system according to claim 2, characterized in that, The control system also includes a power supply module and a battery management module connected to the power supply module; The battery management module is communicatively connected to the control module; The battery management module is used to monitor and manage the power supply module; The control module is also used to obtain the power information of the power supply module through the battery management module; And / or, the control system further includes a mileage recording module for recording the mileage information, the control module being communicatively connected to the mileage recording module, and the control module being further configured to receive the mileage information; And / or, the control module is further configured to generate a boost level based on the target output power, and to generate the pacing information based on the speed feedback signal.

4. The control system according to claim 3, characterized in that, The power supply module includes at least two power supply units.

5. The control system according to claim 1, characterized in that, The control system also includes a wireless communication module, which is used to establish a communication connection with the target device. And / or, The control system further includes an interaction module, which is communicatively connected to the control module. The interaction module is used to receive user operations and generate corresponding operation instructions; The control module is used to receive the operation instructions and perform corresponding operations according to the operation instructions.

6. The control system according to claim 5, characterized in that, The control system also includes a mobile application, which is communicatively connected to the control module. The control module is communicatively connected to the wireless communication module; The control module is used to send the status information of the electric bicycle to the mobile application in the target device through the wireless communication module; The mobile application is used to receive and display the status information.

7. The control system according to any one of claims 1-6, characterized in that, The control module is a six-tube controller, and the drive module is a brushless three-phase DC motor.

8. An electric bicycle, characterized in that, The control system comprising any one of claims 1-7.

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