Electronic gear shifting method, drive system and power assisted bicycle

Abstract

The application provides a method for realizing electronic gear shifting of an assist electric bicycle, a driving system and the assist electric bicycle, the assist electric bicycle comprising an electric motor as a first driving source, the method comprising: acquiring current gear information; acquiring a current riding state of a user, the current riding state comprising a basic rotation speed of a transmission shaft of the assist electric bicycle, the transmission shaft being driven by human power, and a wheel rotation speed of the assist electric bicycle being proportional to a sum of a first rotation speed of the electric motor and the basic rotation speed; calculating the first rotation speed that the electric motor should reach according to the current gear information and the current riding state; and controlling the electric motor to operate at the first rotation speed, so that the assist electric bicycle operates at a speed ratio corresponding to the current gear information, the speed ratio being defined as a ratio of the wheel rotation speed of the assist electric bicycle to the basic rotation speed.

Description

Technical Field

[0001] The present invention relates to a method for implementing electronic shifting in a power-assisted electric bicycle, a drive system for implementing electronic shifting in a power-assisted electric bicycle, and a power-assisted electric bicycle including such a drive system. Background Technology

[0002] In recent years, with the growing enthusiasm for outdoor sports, electric-assisted electric bicycles (EVs) have become increasingly popular. These EVs typically use a motor and human power to drive one or more wheels, combining the torque of the motor and the human effort. This motor-assisted torque reduces the amount of human effort required. This assistance mode is often called "torque superposition" mode. In torque superposition mode, a torque sensor is usually installed on the pedal crank to detect the torque input by the human. A control algorithm then controls the motor to generate a certain torque to reduce the torque required by the human, thus achieving the assistance function.

[0003] However, for users who seek a sporty driving experience, the torque stacking mode may result in a poor driving experience, because increasing the torque input will not significantly increase the driving speed, but will instead reduce the load on the motor until its output power eventually drops to zero.

[0004] Furthermore, from the perspective of human-powered comfort, saving manpower is not the only evaluation criterion. The appropriate human output frequency (such as the cadence of a bicycle) is also an important factor affecting comfort and operability. Typical electric bicycle users only feel comfortable within a very narrow output frequency range, such as 40 to 60 revolutions per minute.

[0005] To solve this problem, a mechanical gear shifting system can be installed. By shifting the chain across different chainrings and freewheels, the gear ratio can be changed, thus achieving gear shifting and keeping the manual output frequency within a suitable range. However, this means that the user must constantly operate the gear shifting system to change gears, and the power needs to be interrupted during the shifting process.

[0006] Therefore, there is a need for a new type of electronic shifting method, drive system, and electric bicycle with such drive system that can achieve multiple shifting modes, without the need for an additional mechanical shifting system, with a wide shifting range, and can continuously output power during shifting, resulting in a good riding experience. Summary of the Invention

[0007] In response to the problems and needs mentioned above, this invention proposes a novel electronic shifting method, a drive system, and an electric bicycle including such a drive system. It solves the above problems and brings other technical effects by adopting the following technical features.

[0008] On one hand, the present invention provides a method for implementing electronic gear shifting in an electric-assist bicycle, the electric-assist bicycle including a motor as a first drive source, the method comprising: acquiring current gear information; acquiring the user's current riding state, the current riding state including a base rotational speed of the drive shaft of the electric-assist bicycle, the drive shaft being driven by human power, and the wheel rotational speed of the electric-assist bicycle being proportional to the sum of a first rotational speed of the motor and the base rotational speed; calculating a first rotational speed that the motor should reach based on the current gear information and the current riding state; controlling the motor to operate at the first rotational speed, such that the electric-assist bicycle operates at a speed ratio corresponding to the current gear information, the speed ratio being defined as the ratio of the wheel rotational speed of the electric-assist bicycle to the base rotational speed.

[0009] In some examples, the drive shaft is a shaft or wheel axle of the transmission system located between the pedal crank and the wheel of the electric-assisted bicycle.

[0010] In some examples, obtaining the user's current riding status includes: obtaining the base speed of the driveshaft via a first sensor, which is located on the transmission system between the driveshaft and the motor.

[0011] In some examples, the first sensor is positioned on a drive shaft.

[0012] In some examples, the method further includes: acquiring the current speed of the motor via a second sensor; calculating the difference or ratio between the first speed and the current speed; and controlling the motor to run at the first speed based on the calculated difference or ratio.

[0013] In some examples, the method further includes: acquiring a gear mode, the gear mode including a manual mode, an AT mode, and a CVT mode, and the power-assisted electric bicycle is capable of switching between at least two gear modes among the manual mode, the AT mode, and / or the CVT mode.

[0014] In some examples, when the gear mode is manual mode, the method further includes: obtaining updated gear information input by the user that is different from the current gear information; calculating the second speed that the motor should reach based on the updated gear information and the current riding state, and controlling the motor to run at the second speed.

[0015] In some examples, when the gear mode is AT mode, the method further includes: determining a preset comfortable riding state, the comfortable riding state corresponding to the speed range of the driveshaft during comfortable riding; determining whether the current riding state falls into the comfortable riding state, and maintaining the current gear information when the current riding state falls into the comfortable riding state.

[0016] In some examples, the method further includes, when the current riding state has not yet fallen into a comfortable riding state, calculating, based on the current riding state, the comfortable riding state, and the current gear information, the target gear information required to fall into a comfortable riding state based on the current riding state; calculating, based on the target gear information and the current riding state, the third speed that the motor should reach, and controlling the motor to run at the third speed.

[0017] In some examples, when the gear mode is CVT mode, the method further includes: determining a preset comfortable riding state, the comfortable riding state corresponding to the rotational speed of the driveshaft during comfortable riding; calculating the target gear information required to fall into the comfortable riding state based on the current riding state, the comfortable riding state, and the current gear information; calculating the fourth speed that the motor should reach based on the target gear information and the current riding state, and controlling the motor to run at the fourth speed.

[0018] In some examples, the method further includes: obtaining the current operating state of the electric-assisted bicycle, the current operating state including at least one of the current rotational speed of the wheels, the rotational speed of the electric-assisted bicycle drive gears, or the posture of the electric-assisted bicycle; and determining a comfortable riding state in the current operating state.

[0019] On the other hand, the present invention also provides a drive system for implementing electronic gear shifting in an electric-assisted bicycle. The drive system includes a motor as a first drive source and receives input from a second drive source independent of the first drive source, such that the output speed of the drive system is equal to the sum of the first speed of the first drive source and the second speed of the second drive source. The drive system further includes: a gear information acquisition module for acquiring gear mode and / or current gear information; a riding state acquisition module for acquiring the user's current riding state, the current riding state corresponding to the base speed of the drive shaft of the electric-assisted bicycle, the drive shaft being driven by the second drive source, and the wheel speed of the electric-assisted bicycle being proportional to the sum of the first speed of the motor and the base speed; a calculation module for calculating target gear information and the first speed the motor should reach based on the gear mode, current gear information, and current riding state, and generating a control signal; and a motor drive module for outputting a motor drive signal based on the control signal, driving the motor to operate at the first speed, such that the electric-assisted bicycle operates at a speed ratio corresponding to the current gear information, the speed ratio being defined as the ratio of the wheel speed of the electric-assisted bicycle to the base speed.

[0020] In another aspect, the present invention also provides an electric-assisted bicycle, including the drive system as described above. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0022] Figure 1 A schematic diagram of an electric bicycle according to at least one embodiment of the present disclosure is shown, wherein the electric bicycle shown is an electric bicycle.

[0023] Figure 2 A cross-sectional view of a drive system according to at least one embodiment of the present disclosure is shown;

[0024] Figure 3 A partial cross-sectional view of an electric motor according to at least one embodiment of the present disclosure is shown;

[0025] Figure 4 Another cross-sectional view of an electric motor according to at least one embodiment of the present disclosure is shown;

[0026] Figure 5 The transmission system of a power-assisted electric bicycle according to at least one embodiment of the present disclosure is shown;

[0027] Figure 6 A flowchart is shown of a method for implementing electronic shifting in an electric-assist bicycle according to at least one embodiment of the present disclosure;

[0028] Figure 7 A flowchart is shown of a method for electronic shifting according to different gear modes according to at least one embodiment of the present disclosure;

[0029] Figure 8 A schematic block diagram of a drive system according to at least one embodiment of the present disclosure is shown;

[0030] Figure 9 Another schematic block diagram of a drive system according to at least one embodiment of the present disclosure is shown. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0033] In recent years, with the growing enthusiasm for outdoor sports, electric-assisted electric bicycles (EVs) have become increasingly popular. These EVs typically use a motor and human power to drive one or more wheels, combining the torque of the motor and the human effort. This motor-assisted torque reduces the amount of human effort required. This assistance mode is often called "torque superposition" mode. In torque superposition mode, a torque sensor is usually installed on the pedal crank to detect the torque input by the human. A control algorithm then controls the motor to generate a certain torque to reduce the torque required by the human, thus achieving the assistance function.

[0034] In one type of application scenario, users may be pursuing a sporty experience. These users are accustomed to increasing their muscle strength output to improve bicycle speed. Therefore, the torque superposition mode may lead to a poor riding experience because increasing the torque input will not significantly increase the riding speed. Instead, it will reduce the load on the motor until its output power eventually drops to zero.

[0035] Furthermore, from the perspective of human-powered comfort, saving manpower is not the only evaluation criterion. The appropriate human output frequency (such as the cadence of a bicycle) is also an important factor affecting comfort and operability. Typical electric bicycle users only feel comfortable within a very narrow output frequency range, such as 40 to 60 revolutions per minute.

[0036] To solve this problem, a mechanical transmission system can be installed. However, users need to frequently shift gears manually while driving, and the shifting process requires interruption of human power input.

[0037] In view of the defects and shortcomings of the existing technology, the present invention proposes a novel electronic shifting method, a drive system, and an electric bicycle including the drive system, which can realize automated shifting of multiple shifting modes without the need for an additional mechanical shifting system. It has a wide shifting range and can continuously output power during shifting, bringing a good riding experience.

[0038] It should be noted that the range of wheeled vehicles to which the drive system of this invention is applicable can be quite broad, including but not limited to electric-assisted bicycles, electric-assisted scooters, electric-assisted bicycles, or electric-assisted wheelchairs. Bicycles and wheelchairs are conventional and well-known forms of wheeled vehicles. A conventional form of bicycle is one that is continuously propelled by the rider applying force to the pedals; another, more recent form of bicycle is the electric-assisted bicycle, in which electricity is used to assist or replace the rider's force. Wheeled vehicles can have two, three, or four wheels, and in some cases even more.

[0039] It should be noted that the "rotational fixing" described in this invention refers to fixing two or more components in the circumferential direction, so that the two or more components can rotate simultaneously without relative displacement in the circumferential direction. Rotational fixing does not limit whether these components are relatively fixed in the axial direction or whether relative displacement can occur.

[0040] To simplify the description, this invention will primarily use an electric-assisted bicycle as an example to illustrate the electronic shifting method and drive system based on the concept of this invention. However, this invention is not limited thereto, and those skilled in the art can easily adapt the concepts of this invention to other wheeled vehicle applications without departing from the scope of protection of this invention.

[0041] Unlike torque superposition modes, the electronic gear shifting method proposed in this invention is particularly suitable for drive systems or electric bicycles with speed superposition modes. It should be noted that the "speed superposition" mode referred to in this invention means that the motor and human power jointly drive one or more wheels, superimposing the motor's rotational speed and the pedaling frequency. For example, if the driveshaft is driven by human power, the final wheel speed of the electric bicycle is proportional to the sum of the motor's initial rotational speed and the driveshaft's base rotational speed.

[0042] To facilitate understanding of the electronic shifting method of the present invention, the accompanying drawings exemplarily illustrate an embodiment of an electric-assisted bicycle employing a "speed superposition" mode. It should be noted that the electronic shifting method of the present invention is applicable not only to electric-assisted bicycles with the following structures, but also to any electric-assisted bicycle employing a "speed superposition" mode. In other words, it is applicable to any wheeled vehicle employing a "speed superposition" mode, including but not limited to electric-assisted bicycles, electric-assisted bicycles, electric-assisted scooters, or electric-assisted wheelchairs.

[0043] Various embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repeated descriptions of them will be omitted.

[0044] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this invention may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, without departing from the spirit of the invention, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0045] Reference Figure 1 A power-assisted electric bicycle 100 according to at least one embodiment of the present disclosure includes a drive system 1, wheels 2, a transmission system 3, pedal cranks 4, and a power module 5. The transmission system 3 includes a bottom bracket 6 and a wheel axle 7, as well as a crank chainring 70, reduction gears, and a chain (not shown). In an alternative embodiment, the transmission system 3 may further include an additional intermediate shaft (not shown) disposed between the bottom bracket 6 and the wheel axle 7. Figure 1 In the illustrated embodiment, the drive system 1 and the pedal crank 4 are mounted on the central shaft 6. The drive system 1 includes a motor 10 as the first drive source. This configuration is also known as a mid-mounted motor. When the electric bicycle 100 is manually driven and the pedal is pressed, the pedal crank 4 rotates, which in turn rotates the central shaft 6. The central shaft 6 transmits the rotational motion to the transmission system 3 through the drive system 1, thereby rotating the wheel axle 7 and the wheel 2, thus enabling the electric bicycle 100 to move.

[0046] Existing "torque superposition" mid-drive motor systems have the motor fixed between the front and rear wheels. The motor is connected to the pedal crank via a reduction gear. A torque sensor detects the pedaling force, and a controller controls the motor's output. The motor drives the reduction gear, which in turn drives the crankshaft. The chainring on the pedal crank then drives the wheels via a chain, outputting power. However, this method has many problems, such as the aforementioned poor comfort and operability, and narrow gear range.

[0047] The following combination Figures 2 to 5 ,as well as Figure 9 Specific embodiments of the drive system 1 are described to illustrate the structure and operation of the drive system 1. The technical effects of the present invention are demonstrated in detail in the description of the embodiments.

[0048] like Figure 9As shown, the drive system 1 includes a motor 10, a motor support frame 8, and multiple sensors 91, 92, 93, and 94. The motor support frame 8 is used to support the motor 10 on the frame or bracket of the electric-assist bicycle 100. The motor support frame 8 can be coaxially arranged with the motor 10, and the motor support frame 8 can then be fixedly connected to the frame or bracket of the electric-assist bicycle 100.

[0049] For example, such as Figures 2 to 4 As shown, the motor 10 may include a stator 11, a rotor 12, a first set of bearings 30, a second set of bearings 40, and a one-way bearing 50. In this embodiment, the motor 10 is an external rotary motor with the stator 11 disposed on the inner diameter side and the rotor 12 disposed on the outer diameter side. The stator 11 is annular in shape, and an armature coil is wound on the stator 11 to form a winding 111. The stator 11 is rotatably and fixedly connected to the drive shaft 101 of the electric bicycle 100, and preferably coaxially arranged. In this embodiment, the rotatable fixing is achieved by a key or spline connection. This disclosure is not limited to this, and the rotatable fixing connection can also be achieved by locking nuts, flange connections, welding, riveting, etc. In this embodiment, the stator 11 is fixedly connected to the central shaft 6 of the electric bicycle 100, and the central shaft 6 is fixedly connected to the pedal crank 4.

[0050] The drive shaft 101 includes a shaft or wheel axle of the transmission system 3 disposed between the pedal crank 4 and the wheel 2 of the electric-assisted bicycle 100. For example, it can be the bottom bracket 6 or wheel axle 7 of the electric-assisted bicycle 100, or optionally, an additional intermediate shaft (not shown) disposed between the bottom bracket 6 and the wheel axle 7. The axial position of the stator 11 relative to the drive shaft 101 can be fixed by the shoulder and retaining ring of the drive shaft 101. Therefore, the stator 11 can rotate under the drive of the drive shaft 101. The stator 11 can be coaxially disposed with the bottom bracket 6 or the wheel axle 7, or share the same bottom bracket 6 or wheel axle 7.

[0051] The rotor 12 is disposed radially outside the stator 11, and a magnetic gap exists between the stator 11 and the rotor 12. The rotor 12 is supported on the drive shaft 101 by a first set of bearings 30, which may include one or more bearings, for example, two bearings in this embodiment. The first set of bearings 30 is arranged between the stator 11 and the rotor 12, with its inner ring engaging the drive shaft 101 and its outer ring engaging the rotor 12, thereby allowing the rotor 12 to rotate around the drive shaft 101 and the stator 11. The rotor 12 may be surrounded by a separate motor housing (not shown), or in this embodiment, the rotor 12 itself may also serve as a rotatable motor housing. The rotor 12 is fixedly connected to a crank chainring 70, which is connected to the wheel 2 via a reduction gear and a chain, thereby driving the wheel 2 to rotate as the rotor 12 rotates.

[0052] The second set of bearings 40 can be arranged between the electric bicycle 100 and the stator 11. More specifically, in this embodiment, it is arranged between the motor support frame 8, which is fixedly connected to the electric bicycle 100, and the stator 11. Figure 2 As shown, the second set of bearings 40 may include one or more bearings, such as two bearings in this embodiment. Exemplarily, the second set of bearings 40 are arranged on the outer side of the first set of bearings 30 in the axial direction relative to the stator 11 to support the motor support frame 8 on the drive shaft 101.

[0053] Thus, the drive shaft 101, driven by human power or a second drive source, can rotate at a first speed, while the motor 10, as the first drive source, can drive the rotor 12 to rotate relative to the stator 11 at a second speed. Consequently, the rotational speed of the rotor 12 is equal to the sum of the first and second rotational speeds, and the wheel 2 can rotate at the speed of the rotor 12 or the speed after transmission multiplied by the transmission ratio. Here, the second drive source can be a drive source other than human power, such as an electric actuator.

[0054] Therefore, the drive system 1 proposed in this disclosure achieves the superposition of the rotational speeds of the electric bicycle 100 by rotating and fixing the stator 11 to the shaft of the transmission system 3 or the wheel axle 7 of the electric bicycle 100, and connecting the rotor 12 to the wheel, thereby providing users with a comfortable riding experience.

[0055] Since the stator 11 of this disclosure is kept rotating and fixed to the shaft of the transmission system 3 or the wheel axle 7 of the electric bicycle 100, there is no need to switch or change the connection relationship between the stator 11 and these shafts.

[0056] Furthermore, by changing the rotational speed of rotor 12, the transmission ratio between the rotational speed of rotor 12 and the rotational speed of pedal crank 4 is variable. Therefore, this solution eliminates the need for cumbersome gear shifting and complex gear shifting devices, and can achieve a fixed or variable transmission ratio through electronic control.

[0057] To prevent the motor 10 from reversing during operation, a one-way bearing 50 may be provided between the rotor 12 and the stator 11, between the stator 11 and the motor housing, or between the rotor 12 and the motor housing.

[0058] In this embodiment, the motor 10 further includes at least one conductive contact ring 60, which is rotatably disposed at at least one end of the drive shaft 101. The conductive contact ring 60 is electrically connected to the stator 11 and is used to continuously supply power to the stator 11 during operation, while preventing faults such as wire twisting during rotation.

[0059] The above exemplarily illustrates an embodiment of the drive system 1 in the form of a mid-mounted motor. This disclosure is not limited thereto; the drive system 1 based on the inventive concept can also be used in other drive configurations.

[0060] For example, optionally, a drive shaft 101 is provided between an additional intermediate shaft (not shown) between the bottom bracket 6 and the wheel axle 7, and then the stator 11 can be driven to the bottom bracket 6 of the power-assisted electric bicycle 100, the bottom bracket 6 being fixedly connected to the pedal crank 4, and the rotor 12 or the motor housing connected to the rotor 12 can be driven to the wheel axle 7.

[0061] For example, the drive system 1 can also be a hub motor, located on the side of the wheel 2. The stator 11 is fixedly connected to the wheel axle 7, and the rotor 12 is connected to the hub of the wheel 2. In the hub motor configuration, the rotor 12 can directly drive the wheel 2.

[0062] The multiple sensors 91, 92, 93, and 94 may include a first sensor 91, a second sensor 92, a third sensor 93, and a fourth sensor 94. Among them, the third sensor 93 and the fourth sensor 94 are optional.

[0063] The first sensor 91 is disposed on the stator 11 and / or rotor 12 for detecting the absolute position of the stator 11 and / or rotor 12. It is worth noting that since the stator 11 is rotated and fixed to the shaft or wheel axle 7 of the transmission system 3 of the wheeled vehicle 100, the first sensor 91 can also be disposed on the shaft or wheel axle 7, which is considered as being disposed on the stator 11. In addition to absolute position, the first sensor 91 can also measure the absolute speed of the stator 11 and / or rotor 12.

[0064] The second sensor 92 can be arranged between the stator 11 and the rotor 12 to detect the relative positional relationship between the stator 11 and the rotor 12. The second sensor 92 can also measure the relative speed of the stator 11 and / or the rotor 12, that is, the rotational speed of the motor 10.

[0065] Optionally, the third sensor 93 is used to detect the attitude of the wheeled vehicle 100 to match a suitable gear ratio for different wheeled vehicle attitudes. In some application scenarios, it is necessary to match a suitable gear ratio for the user based on the attitude of the wheeled vehicle 100 to achieve a comfortable riding state. The third sensor 93 can be, for example, a multi-axis attitude sensor integrating an accelerometer and a gyroscope sensor, or a multi-axis attitude sensor integrating an accelerometer, a gyroscope sensor, and a magnetic field sensor, or a multi-axis attitude sensor integrating an accelerometer, a gyroscope sensor, a magnetic field sensor, and a barometric pressure sensor (for measuring altitude information). Taking a multi-axis attitude sensor integrating an accelerometer and a gyroscope sensor as an example, the third sensor 93 can collect the current attitude angle of the wheeled vehicle 100, such as pitch angle, roll angle, or raw angle, thereby sensing whether the wheeled vehicle 100 is on flat ground, uphill, downhill, turning left and right, or swaying, and matching a suitable gear ratio based on the attitude of the wheeled vehicle 100. For example, the gear ratio can be higher when going uphill and lower when going downhill compared to flat ground.

[0066] Optionally, the fourth sensor 94 is used to detect the input force and / or input frequency of the pedal crank 4. For example, the fourth sensor 94 is used for the input frequency of the pedal crank 4, which is the cadence of human pedaling. Directly obtaining the cadence makes it easier to calculate and drive the motor 10 to adjust to a suitable speed to control the cadence within a comfortable range for the user.

[0067] For example, the first sensor 91, the second sensor 92 and the fourth sensor 94 can be encoders or speed sensors, such as photoelectric encoders, magnetoelectric sensors, Hall sensors, etc.

[0068] According to another aspect of this disclosure, a method for implementing electronic gear shifting in a power-assisted electric bicycle 100 is provided, the power-assisted electric bicycle 100 including a motor 10 as a first drive source. The method includes the following steps:

[0069] S101, Obtain current gear information;

[0070] S102. Obtain the user's current riding status. The current riding status includes the base rotational speed V0 of the drive shaft of the electric-assist bicycle, which is driven by human power, and the wheel rotational speed V of the electric-assist bicycle. w It is proportional to the sum of the motor's first speed V1 and its base speed V0;

[0071] S103. Calculate the first speed V1 that the motor should reach based on the current gear information and the current riding status;

[0072] S104. Control the motor to run at a first speed, so that the electric-assisted bicycle runs at the speed ratio corresponding to the current gear information. The speed ratio is defined as the ratio of the wheel speed of the electric-assisted bicycle to the base speed.

[0073] Step S101: Obtaining the current gear information. This can be achieved by acquiring user-inputted gear information or updated gear information via the gear information acquisition module M1. The gear information acquisition module M1 can be wired (e.g., USB, Ethernet, serial cable, parallel cable, etc.) and / or wirelessly connected (e.g., Bluetooth, Wi-Fi, Zigbee, etc.) to the calculation module M3. The current gear information can originate from user input in manual mode, or from the target gear information calculated by the calculation module M3 based on a simulated riding gear algorithm in AT or CVT mode. The current gear information can be discrete (in manual and AT modes) or continuous (in CVT mode). The gear information acquisition module M1 can be a touchscreen or a physical paddle shifter.

[0074] Step S102, obtaining the user's current riding state, can be achieved through sensors. It should be noted that in this embodiment, the current riding state corresponds to the base rotational speed V0 of the drive shaft 101 of the electric-assisted bicycle 100. Alternatively, when the transmission ratio or transmission relationship is clear and the base rotational speed can be calculated precisely, the current riding state can also correspond to the pedal frequency applied manually to the pedal crank 4.

[0075] It should be noted that in this embodiment, "rotational speed" is defined as angular velocity. Given a fixed radius of wheel 2, the absolute velocity of wheel 2 relative to the ground can be calculated from the rotational speed.

[0076] In this embodiment, the drive shaft 101 is driven by human power and is the shaft 6 or wheel axle 7 of the transmission system 3 located between the pedal crank 4 and the wheel 2 of the power-assisted electric bicycle 100. The wheel speed V of the power-assisted electric bicycle 100 is... w The speed is proportional to the sum of the first speed V1 and the basic speed V0 of motor 10, specifically expressed by the following formula (I):

[0077] V w =K(V1+V0)(I)

[0078] The value of K is known and is determined by the reduction ratio between the drive shaft 101 and wheel 2 in the transmission system 3, with K > 0. For example, when the drive shaft 101 is the central axle 6, K is equal to the reduction ratio of the vehicle's reducer. Without a reduction gear, K = 1.

[0079] Specifically, step S102, obtaining the user's current riding status, may include: obtaining the base rotational speed V0 of the drive shaft 101 via the first sensor 91. The first sensor 91 is arranged on the transmission system 3 between the drive shaft 101 and the motor 10.

[0080] In step S103, the first rotational speed V1 causes the wheel rotational speed V to be V w The vehicle operates at the gear ratio P1 corresponding to the current gear information. Gear ratio P1 is defined as the wheel speed V. w The ratio to the base speed V0 is expressed by the following formula (II):

[0081] V w =P1V0(II)

[0082] Based on equations (I) and (II), the formula for calculating the first rotational speed V1 can be obtained:

[0083]

[0084] The speed ratio P1 can be greater than or equal to the reduction ratio K. The calculation module M3 calculates the value of the first speed V1 using equation (III) and generates a control signal.

[0085] Then, step S104 controls the motor to run at a first speed V1, so that the electric bicycle 100 runs at the speed ratio P1 corresponding to the current gear information. For example, the calculation module M3 is connected to the motor drive module M4 and sends a control signal to the motor drive module M4. The motor drive module M4 outputs a motor drive signal according to the control signal, driving the motor 10 to run at the first speed V1.

[0086] Therefore, electronic shifting can be achieved at the desired gear without changing the mechanical shift gears. In Shenzhen, there is no need for a mechanical shifting device, resulting in a wide shifting range and continuous power output during shifting, bringing a good driving experience.

[0087] Optionally, in order to provide feedback adjustment to or change the first speed V1 of the drive motor 10, the method can also obtain the current speed V of the motor 10 through the second sensor 92. c Then calculate the first rotational speed V1 and the current rotational speed V. c The difference or ratio is calculated, and the motor 10 is further controlled to run at a first speed V1 based on the calculated difference or ratio.

[0088] For example, in this embodiment, the shifting method can also be adjusted according to different gear modes.

[0089] This disclosure may exemplarily include a variety of different gear modes, such as manual mode, AT mode and / or CVT mode.

[0090] It should be noted that in manual mode, users can manually input the gear. Gear input can be done via methods such as upshifting and downshifting, or by directly entering the gear number. To enhance the user experience, gear shifting can be done via the touchscreen or using physical paddle shifters.

[0091] In AT mode (also known as automatic mode), similar to an automatic transmission in a vehicle, the user only needs to select forward gear or neutral. In neutral, motor 10 does not run; in forward gear, motor 10 calculates the appropriate target gear based on comfortable riding conditions, ensuring the user always stays within a comfortable riding speed range.

[0092] In CVT mode (also known as continuously variable transmission mode), the method uses motor 10 to adjust the target gear information so that the rotational speed of drive shaft 101 always falls into a comfortable riding speed.

[0093] Specifically, the method further includes step S201 of obtaining the gear mode. The power-assisted electric bicycle 100 can switch between at least two gear modes, including manual mode, AT mode, and / or CVT mode. This switching can be performed via input of gear mode via a touchscreen or by physical paddles.

[0094] When the gear mode is manual, the method may also include the following steps:

[0095] S301. Obtain updated gear information input by the user that differs from the current gear information. During riding, the user may switch gears as needed, such as upshifting or downshifting. Therefore, the updated gear information can be obtained through the gear information acquisition module M1, which differs from the current gear information.

[0096] S302. Based on the updated gear information and the current riding status, calculate the second speed V2 that the motor should reach. The speed ratio corresponding to the updated gear information is P2. Substituting P2 into equation (III), the formula for calculating the second speed V2 is as follows:

[0097]

[0098] S303. Control the motor to run at a second speed. For example, the calculation module M3 is connected to the motor drive module M4 and sends a control signal to the motor drive module M4. The motor drive module M4 outputs a motor drive signal according to the control signal, driving the motor 10 to run at a second speed V2.

[0099] When the gear mode is AT mode, the method may further include the following steps:

[0100] S401. Determine a preset comfortable riding state. In this embodiment, the comfortable riding state corresponds to the rotational speed range [V] of the drive shaft 101 during comfortable riding. min V max Alternatively, the input frequency (cadence) of the pedal crank 4 can be detected by the fourth sensor 94 and converted into rotational speed. In this case, the comfortable riding state corresponds to the human input frequency during comfortable riding.

[0101] S402. Determine whether the current riding state falls into a comfortable riding state. Specifically, compare the base speed V0 corresponding to the current riding state with the speed range [V]. min V max [V] Whether it falls within the speed range min V max In the middle. If V min ≤V0≤V max If the current riding state falls into a comfortable riding state, then it is considered that the current riding state has fallen into a comfortable riding state.

[0102] S403. When the current riding state transitions into a comfortable riding state, maintain the current gear information. In AT mode, maintain the current gear information. At this time, when the user appropriately increases or decreases the base speed V0, with the gear ratio remaining constant, the wheel speed V... w The speed can be increased or decreased proportionally. The required motor speed can then be calculated using equation (III).

[0103] If the judgment is negative, meaning the current riding state has not fallen into a comfortable riding state, then V0... <V min Or V0>V max Step S404 includes calculating the target gear information P3 required to reach the comfortable riding state based on the current riding state, the comfortable riding state, and the current gear information. When the user-inputted base speed V0 does not reach the comfortable riding state, the gear needs to be adjusted to bring the base speed back into the speed range [V]. min V max ]middle.

[0104] Because the wheel speed V at the moment of switching w It remains unchanged, and the adjusted speed ratio P3 can be calculated using the following formula:

[0105]

[0106] Among them, V R It is the speed range [V] min V max A suitable speed value within [the range] can be selected as needed, for example, V. R equals V min and V maxThe average value, i.e. (V) min +V max ) / 2. Alternatively, V can be... min and V max Substitute these values ​​into equation (V) to obtain the maximum and minimum values ​​of the speed ratio P3. Then, select the speed ratio P3 that falls within this range from several discrete speed ratios by looking up a table.

[0107] S405. Based on the target gear information P3 and the current riding state, calculate the third speed V3 that the motor should reach. The gear ratio corresponding to the target gear information is P3. Substituting P3 into equation (III), the formula for calculating the third speed V3 is as follows:

[0108]

[0109] S406. Control the motor to run at the third speed V3. For example, the calculation module M3 is connected to the motor drive module M4 and sends a control signal to the motor drive module M4. The motor drive module M4 outputs a motor drive signal according to the control signal, driving the motor 10 to run at the third speed V3.

[0110] When the gear mode is CVT mode, the method further includes the following steps:

[0111] S501. Determine a preset comfortable riding state, which corresponds to the rotational speed of the driveshaft during comfortable riding. Unlike AT mode, in CVT mode, the comfortable riding state corresponds to a given rotational speed V of the driveshaft 101. t This ensures that the user's final input frequency remains consistent during acceleration and deceleration, while the wheel speed is changed by altering the speed of motor 10.

[0112] S502. Based on the current riding state, comfortable riding state, and current gear information, calculate the target gear information P4 required to transition to the comfortable riding state based on the current riding state. Similar to equation (V), since the wheel speed V at the moment of shifting... w It remains unchanged, and the adjusted speed ratio P4 can be calculated using the following formula:

[0113]

[0114] Among them, V t It is the given speed of drive shaft 101 under comfortable riding conditions.

[0115] S503. Based on the target gear information and the current riding state, calculate the fourth speed V4 that the motor should reach. The gear ratio corresponding to the target gear information is P4. Substituting P4 into equation (III), the calculation formula for the fourth speed V4 is as follows:

[0116]

[0117] S504. Control the motor to run at the fourth speed V4. For example, the calculation module M3 is connected to the motor drive module M4 and sends a control signal to the motor drive module M4. The motor drive module M4 outputs a motor drive signal according to the control signal, driving the motor 10 to run at the fourth speed V4.

[0118] Optionally, the method of this disclosure can also determine a comfortable riding state based on the current operating state of the electric-assisted bicycle 100. For example, the method may further include acquiring the current operating state of the electric-assisted bicycle, the current operating state including the current rotational speed V of the wheels. w At least one of the following: the rotational speed of the power-assisted electric bicycle's transmission gears or the posture of the power-assisted electric bicycle (via the third sensor 93). For example, when going uphill, the pitch angle of the power-assisted electric bicycle is greater than 0 degrees, at which point the user prefers to drive the bicycle with a low cadence, so the rotational speed for a comfortable riding state can be lower compared to riding on flat ground (0 degrees pitch angle). Conversely, when going downhill, the rotational speed for a comfortable riding state is higher. Further, the comfortable riding state under the current operating condition is determined.

[0119] Optionally, the comfortable riding state can also include the driveshaft speed and input force during comfortable riding. The fourth sensor 94 simultaneously detects the input force and input frequency of the pedal crank 4. By combining the torque superposition mode and the speed superposition mode, the appropriate driveshaft speed and input force for the user's comfortable riding state are comprehensively determined. Based on the input force and input frequency of the pedal crank 4, the motor speed and torque are adjusted so that the user can drive the bicycle within a comfortable cadence and torque range.

[0120] Some embodiments involve using one or more processors, processing devices, or controllers, such as general-purpose central processing units (CPUs), graphics processing units (GPUs), microcontrollers, reduced instruction set computer (RISC) processors, application-specific integrated circuits (ASICs), programmable logic circuits (PLCs), field-programmable gate arrays (FPGAs), digital signal processing (DSP) devices, and / or any other circuitry or processing devices capable of performing the functions described herein. The methods described herein may be encoded as executable instructions embodied in a computer-readable medium, including but not limited to storage devices and / or memory devices. These instructions, when executed by a processing device, cause the processing device to perform at least a portion of the methods described herein. The examples above are merely exemplary and are therefore not intended to limit the definition and / or meaning of the terms processor and processing device in any way.

[0121] Those skilled in the art will understand that aspects of the present invention can be described and illustrated through several patentable types or situations, including any new and useful combination of processes, machines, products, or substances, or any new and useful improvements thereof. Accordingly, aspects of the present invention can be implemented entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The aforementioned hardware or software may be referred to as a “data block,” “module,” “engine,” “unit,” “component,” or “system.” Furthermore, aspects of the present invention may be embodied as a computer product located on one or more computer-readable media, the product comprising computer-readable program code.

[0122] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as being interpreted in an idealized or highly formalized sense, unless expressly defined herein.

[0123] The following clauses provide examples of the electronic shifting methods, drive systems, and power-assisted electric bicycles disclosed herein.

[0124] Clause 1: A method for implementing electronic shifting in a power-assisted electric bicycle, the power-assisted electric bicycle including a motor as a first drive source, the method comprising:

[0125] Get the current gear information;

[0126] The user's current riding status is obtained, which includes the base speed of the drive shaft of the electric bicycle, the drive shaft being driven by human power, and the wheel speed of the electric bicycle being proportional to the sum of the motor's first speed and the base speed.

[0127] Based on the current gear information and the current riding status, calculate the first speed that the motor should reach;

[0128] The motor is controlled to run at a first speed, so that the electric bicycle operates at the speed ratio corresponding to the current gear information, wherein the speed ratio is defined as the ratio of the wheel speed of the electric bicycle to the base speed.

[0129] Clause 2: The method as described in Clause 1, wherein the drive shaft is a shaft of a transmission system disposed between the pedal crank and the wheel of the electric-assist bicycle or a wheel axle.

[0130] Clause 3: The method as described in Clause 1, wherein obtaining the user's current riding status includes: obtaining the base speed of the driveshaft via a first sensor, the first sensor being arranged on the transmission system between the driveshaft and the motor.

[0131] Clause 4: The method as described in Clause 3, wherein the first sensor is arranged on the drive shaft.

[0132] Clause 5: As described in Clause 1, it also includes:

[0133] The current speed of the motor is obtained through the second sensor;

[0134] Calculate the difference or ratio between the first rotational speed and the current rotational speed;

[0135] Based on the calculated difference or ratio, the motor is controlled to run at the first speed.

[0136] Clause 6: The method described in Clause 1 further includes:

[0137] The electric bicycle is equipped with a gear mode, which includes manual mode, AT mode and CVT mode, and the electric bicycle is capable of switching between at least two gear modes among manual mode, AT mode and / or CVT mode.

[0138] Clause 7: The method as described in Clause 6, wherein when the gear mode is manual mode, the method further comprises:

[0139] Obtain updated gear information that differs from the current gear information input by the user;

[0140] Based on the updated gear information and the current riding status, the second speed that the motor should reach is calculated, and the motor is controlled to run at the second speed.

[0141] Clause 8: The method as described in Clause 6, wherein when the gear mode is AT mode, the method further comprises:

[0142] A preset comfortable riding state is determined, which corresponds to the rotational speed range of the drive shaft during comfortable riding;

[0143] Determine whether the current riding state has fallen into a comfortable riding state, and maintain the current gear information when the current riding state has fallen into a comfortable riding state.

[0144] Clause 9: The method as described in Clause 8, wherein the method further comprises:

[0145] If the current riding state has not yet reached the comfortable riding state, calculate the target gear information required to reach the comfortable riding state based on the current riding state, the comfortable riding state, and the current gear information.

[0146] Based on the target gear information and the current riding status, calculate the third speed that the motor should reach, and control the motor to run at the third speed.

[0147] Clause 10: The method as described in Clause 6, wherein when the gear mode is CVT mode, the method further comprises:

[0148] A preset comfortable riding state is determined, which corresponds to the rotational speed of the drive shaft during comfortable riding;

[0149] Based on the current riding status, comfortable riding status, and current gear information, calculate the target gear information required to fall into the comfortable riding status based on the current riding status.

[0150] Based on the target gear information and the current riding status, calculate the fourth speed that the motor should reach, and control the motor to run at the fourth speed.

[0151] Clause 11: The method as described in any one of Clauses 8 to 10 further includes:

[0152] The current operating state of the electric-assisted bicycle is obtained, and the current operating state includes at least one of the following: the current rotational speed of the wheels, the rotational speed of the transmission gears of the electric-assisted bicycle, or the posture of the electric-assisted bicycle.

[0153] Determine the comfortable riding conditions under the current operating conditions.

[0154] Clause 12: A drive system for implementing electronic shifting in an electric-assisted bicycle, the drive system comprising a motor as a first drive source and receiving input from a second drive source independent of the first drive source, such that the output speed of the drive system is equal to the sum of a first speed of the first drive source and a second speed of the second drive source, wherein the drive system further comprises:

[0155] The gear information acquisition module is used to acquire gear mode and / or current gear information;

[0156] The riding status acquisition module is used to acquire the user's current riding status, which corresponds to the base speed of the drive shaft of the electric bicycle. The drive shaft is driven by a second drive source, and the wheel speed of the electric bicycle is proportional to the sum of the motor's first speed and the base speed.

[0157] The calculation module is used to calculate the target gear information and the first speed that the motor should reach based on the gear mode, the current gear information and the current riding state, and generate a control signal;

[0158] The motor drive module outputs a motor drive signal according to the control signal, driving the motor to run at a first speed, so that the electric bicycle runs at the speed ratio corresponding to the current gear information, wherein the speed ratio is defined as the ratio of the wheel speed of the electric bicycle to the base speed.

[0159] Clause 13: An electric-assisted bicycle, including the drive system as described in Clause 12.

[0160] In addition to the above provisions, the following provisions also provide examples of drive systems for wheeled vehicles and wheeled vehicles.

[0161] Clause 14: A drive system for a wheeled vehicle, comprising an electric motor as a first drive source, characterized in that the electric motor comprises:

[0162] The stator is rotatably fixed to the drive shaft of the wheeled vehicle, the drive shaft being driven by human power or a second drive source, and the stator and the drive shaft are rotatable relative to the wheeled vehicle;

[0163] The rotor is connected to the wheels of the wheeled vehicle to drive the wheels to rotate, and the rotational speed of the rotor is equal to the sum of a first rotational speed of the drive shaft and a second rotational speed of the rotor relative to the stator.

[0164] Clause 15: The drive system as described in Clause 14, characterized in that the drive shaft comprises a shaft or wheel axle of a transmission system disposed between the pedal crank and the wheel of the wheeled vehicle.

[0165] Clause 16: The drive system as described in Clause 15 is characterized in that the transmission ratio between the rotational speed of the rotor and the rotational speed of the pedal crank is variable by changing the rotational speed of the rotor.

[0166] Clause 17: The drive system as described in Clause 15, characterized in that the stator is fixedly connected to the central shaft of the wheeled vehicle, and the central shaft is fixedly connected to the pedal crank.

[0167] Clause 18: The drive system as described in Clause 15, characterized in that the stator is driven to the central shaft of the wheeled vehicle, the central shaft is fixedly connected to the pedal crank, and the rotor or the motor housing connected to the rotor is driven to the wheel axle.

[0168] Clause 19: The drive system as described in Clause 15, characterized in that the stator is fixedly connected to the wheel axle.

[0169] Clause 20: The drive system as described in Clause 14, characterized in that the motor further comprises: at least one conductive contact ring rotatably disposed at at least one end of the drive shaft, the conductive contact ring being electrically connected to the stator for supplying power to the stator.

[0170] Clause 21: The drive system as described in Clause 14, characterized in that the motor further comprises:

[0171] The first set of bearings is arranged between the stator and the rotor;

[0172] The second set of bearings is arranged between the wheeled vehicle and the stator, or between the wheeled vehicle and the rotor.

[0173] Clause 22: The drive system as described in Clause 21, characterized in that the motor further comprises:

[0174] The motor housing connected to the rotor; and

[0175] A one-way bearing is arranged between the stator and the rotor, between the stator and the motor housing, or between the rotor and the motor housing.

[0176] Clause 23: The drive system as described in Clause 14 is characterized in that a first sensor is arranged on the stator and / or rotor for detecting the absolute position of the stator and / or rotor.

[0177] Clause 24: The drive system as described in Clause 23 is characterized in that a second sensor is further arranged between the stator and the rotor for detecting the relative positional relationship between the stator and the rotor.

[0178] Clause 25: The drive system as described in Clause 16, characterized in that the drive system further comprises:

[0179] A third sensor is used to detect the attitude of the wheeled vehicle in order to match a suitable transmission ratio for different wheeled vehicle attitudes; and / or

[0180] The fourth sensor is used to detect the input force and / or input frequency of the pedal crank.

[0181] Clause 26: A wheeled vehicle characterized by comprising a drive system as described in any one of Clauses 14 to 25.

[0182] Clause 27: The wheeled vehicle as described in Clause 26 is characterized in that the wheeled vehicle is an electric-assisted bicycle, an electric-assisted pedal bicycle, an electric-assisted scooter, or an electric-assisted wheelchair.

[0183] The foregoing description, with reference to preferred embodiments, details exemplary implementations of the electronic shifting method, drive system, and electric-assist bicycle proposed in this invention. However, those skilled in the art will understand that various modifications and variations can be made to the specific embodiments described above without departing from the spirit of this invention. Furthermore, various combinations of the technical features and structures proposed in various aspects of this invention can be made without exceeding the scope of protection of this invention, which is determined by the appended claims.

Claims

1. A method for implementing electronic shifting in a power-assisted electric bicycle, the power-assisted electric bicycle including a motor as a first drive source, the method comprising: Get the current gear information; The user's current riding status is obtained, which includes the base speed of the drive shaft of the electric bicycle, the drive shaft being driven by human power, and the wheel speed of the electric bicycle being proportional to the sum of the motor's first speed and the base speed. Based on the current gear information and the current riding status, calculate the first speed that the motor should reach; The motor is controlled to run at a first speed, so that the electric bicycle operates at the speed ratio corresponding to the current gear information, wherein the speed ratio is defined as the ratio of the wheel speed of the electric bicycle to the base speed.

2. The method as described in claim 1, wherein, The drive shaft is a shaft or wheel axle of the transmission system located between the pedal crank and the wheel of the electric bicycle.

3. The method as described in claim 1, wherein, Obtaining the user's current riding status includes: acquiring the base speed of the drive shaft via a first sensor, which is located on the transmission system between the drive shaft and the motor.

4. The method of claim 1, further comprising: The current speed of the motor is obtained through the second sensor; Calculate the difference or ratio between the first rotational speed and the current rotational speed; Based on the calculated difference or ratio, the motor is controlled to run at the first speed.

5. The method of claim 1, further comprising: The electric bicycle is equipped with a gear mode, which includes manual mode, AT mode and CVT mode, and the electric bicycle is capable of switching between at least two gear modes among manual mode, AT mode and / or CVT mode.

6. The method of claim 5, wherein, When the gear mode is manual mode, the method further includes: Obtain updated gear information that differs from the current gear information input by the user; Based on the updated gear information and the current riding status, the second speed that the motor should reach is calculated, and the motor is controlled to run at the second speed.

7. The method of claim 5, wherein, When the gear mode is AT mode, the method further includes: A preset comfortable riding state is determined, which corresponds to the rotational speed range of the drive shaft during comfortable riding; Determine whether the current riding state has fallen into a comfortable riding state, and maintain the current gear information when the current riding state has fallen into a comfortable riding state.

8. The method of claim 7, wherein, The method further includes: If the current riding state has not yet reached the comfortable riding state, calculate the target gear information required to reach the comfortable riding state based on the current riding state, the comfortable riding state, and the current gear information. Based on the target gear information and the current riding status, calculate the third speed that the motor should reach, and control the motor to run at the third speed.

9. The method of claim 5, wherein, When the gear mode is CVT mode, the method further includes: A preset comfortable riding state is determined, which corresponds to the rotational speed of the drive shaft during comfortable riding; Based on the current riding status, comfortable riding status, and current gear information, calculate the target gear information required to fall into the comfortable riding status based on the current riding status. Based on the target gear information and the current riding status, calculate the fourth speed that the motor should reach, and control the motor to run at the fourth speed.

10. The method of any one of claims 7 to 9, further comprising: The current operating state of the electric-assisted bicycle is obtained, and the current operating state includes at least one of the following: the current rotational speed of the wheels, the rotational speed of the transmission gears of the electric-assisted bicycle, or the posture of the electric-assisted bicycle. Determine the comfortable riding conditions under the current operating conditions.

11. A drive system for implementing electronic shifting in a power-assisted electric bicycle, the drive system comprising a motor as a first drive source and receiving input from a second drive source independent of the first drive source, such that the output speed of the drive system is equal to the sum of a first speed of the first drive source and a second speed of the second drive source, wherein, The drive system also includes: The gear information acquisition module is used to acquire gear mode and / or current gear information; The riding status acquisition module is used to acquire the user's current riding status, which corresponds to the base speed of the drive shaft of the electric bicycle. The drive shaft is driven by a second drive source, and the wheel speed of the electric bicycle is proportional to the sum of the motor's first speed and the base speed. The calculation module is used to calculate the target gear information and the first speed that the motor should reach based on the gear mode, the current gear information and the current riding state, and generate a control signal; The motor drive module outputs a motor drive signal according to the control signal, driving the motor to run at a first speed, so that the electric bicycle runs at the speed ratio corresponding to the current gear information, wherein the speed ratio is defined as the ratio of the wheel speed of the electric bicycle to the base speed.

12. An electric-assisted bicycle, comprising the drive system as described in claim 11.

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