Drive system for a bicycle, bicycle and driving method

Abstract

The application discloses a driving system of a bicycle, the bicycle and a driving method, which comprises a human power mechanism, a driving motor, a battery pack, a control unit, a data acquisition unit and a resistance device; the driving motor is in driving connection with a driving wheel of the bicycle; the data acquisition unit comprises a first data acquisition element and a second data acquisition element; the data collected by the first data acquisition element can reflect the motion frequency of the human power mechanism; and the data collected by the second data acquisition element can reflect the driving torque borne by the driving wheel. In the application, the control unit collects the riding data of a rider through the first data acquisition element, and changes the rotating speed of the driving motor according to the data, so that the bicycle has a large speed change range due to the high rotating speed range of the driving motor; on the other hand, the control unit changes the coil current of the resistance device according to the data generated by the second data acquisition element, and generates the magnetic resistance to the human power mechanism, so as to simulate the riding resistance and keep the riding fun.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycles, in particular to a driving system of a bicycle, the bicycle and a driving method. BACKGROUND

[0002] Bicycle is a common means of transport in life, with the progress of science and technology, the current bicycle form also become diversified, mainly reflected in the form of power change, from the development of human power to motor power and pure motor drive, the prior art, the general approach is to set the middle motor in the position of the bicycle pedal shaft, then, the middle motor and the shaft through the same power transmission route to the drive wheel of the bicycle, such as patent CN202400243U etc. disclosed a typical driving system for bicycle, which can realize three power modes of human power output, human power and motor torque hybrid output and pure motor torque output, the bicycle with this power system due to the limitation of human mechanism, if you want to achieve a larger variable speed mode, the rear wheel still needs to carry a variable speed mechanism, such as chain disc type variable speed mechanism, electric variable speed mechanism, etc. This makes the power system more complex, and the traditional variable speed mechanism has the disadvantage of strong jerk when switching gear. And the bicycle driven by pure motor also has the disadvantage of losing the fun of riding. SUMMARY

[0003] The present application provides a driving system of a bicycle, a bicycle and a driving method which can maintain the fun of riding and have a larger variable speed range.

[0004] Technical scheme: In order to achieve the above purpose, the driving system of the bicycle of the present application comprises a human mechanism, a driving motor, a battery pack, a control unit and a data acquisition system; the driving motor is electrically connected with the battery pack and drivingly connected with the drive wheel of the bicycle, and there is no transmission connection relationship between the driving motor and the human mechanism; the driving motor can be connected with the drive wheel through a speed reducer or the driving motor is internally integrated with a speed reduction mechanism, the speed ratio of the speed reducer or the speed reduction mechanism can be selected in the range of 20-100, preferably 50; the form of the speed reduction mechanism can be planetary gear speed reducer, harmonic speed reducer, etc. The driving motor and the data acquisition system are connected with the control unit;

[0005] It also comprises a resistance device; the resistance device is connected with the control unit and the battery pack; the resistance device can generate resistance to the human mechanism, and the resistance generated thereby can be changed by the control unit;

[0006] The data acquisition system includes a first data acquisition element and a second data acquisition element; the data collected by the first data acquisition element can reflect the movement frequency of the human mechanism, that is, the collected data is the movement frequency itself or data related to the movement frequency; the data collected by the second data acquisition element can reflect the driving torque of the drive motor on the drive wheel, that is, the collected data is the driving torque itself or data related to the driving torque.

[0007] The aforementioned human-powered mechanism is preferably a traditional pedal mechanism, consisting of a pedal unit, a crank, and a central axis. The human-powered mechanism may also take other forms, such as a manually rotated handle for use by people with disabilities, or a self-resetting pedal unit that reciprocates within a fixed angle. In this application, the pedal mechanism is used as the implementation mechanism for illustration. In this case, the movement frequency of the human-powered mechanism is also referred to as the cadence, and the first data acquisition element is a sensor such as a Hall effect sensor for detecting the rotational frequency.

[0008] Furthermore, the resistance device is a magnetic resistance device based on magnetic force, which has a coil that generates an electromagnetic field when energized, and also includes a magnetic metal or a permanent magnet that can interact with the coil when energized.

[0009] Furthermore, as a structural form, the resistance device is an electric motor or generator, consisting of a stator and a rotor. One of the stator and rotor contains a winding composed of coils, and the other contains a circumferential array of permanent magnets. When resistance is required to the human-powered mechanism, the winding is energized, causing the resistance device to generate resistance that hinders the operation of the human-powered mechanism. When a motor or generator is used as the resistance device, it can, under certain operating conditions, convert kinetic energy input from the human-powered mechanism into electrical energy to charge the battery pack.

[0010] As a second structural form, the resistance device may include an electromagnet containing a coil and a rotating part with magnetic metal or a permanent magnet. The electromagnet is installed offset from the center of the rotating part, and when energized, it can act on the magnetic metal or permanent magnet on the rotating part to generate resistance to the human power mechanism through attraction or repulsion.

[0011] In addition, the resistance device can also be a device based on friction, such as a friction disk connected to a human mechanism, a friction member, and a driving mechanism that drives the friction member toward and away from the friction disk. The control unit controls the operation of the driving mechanism to change the magnitude of the friction force, thereby generating different magnitudes of resistance to the human mechanism.

[0012] When the driving system is in operation, on one hand, the control unit determines the target speed according to the data collected by the first data collection element, and changes the rotating speed of the driving motor according to the target speed, so that the rotating speed of the bicycle changes with the frequency of the pedaling mechanism. On the other hand, the control unit obtains the torque data directly or indirectly according to the data generated by the second data collection element, calculates the pedaling resistance according to the torque data, and changes the coil current of the coil assembly in the resistance device according to the pedaling resistance, so as to simulate the pedaling resistance and keep the riding fun.

[0013] In the above scheme, two motors are arranged, the driving motor is directly connected to the driving wheel without transmission connection between the driving motor and the pedaling mechanism and between the pedaling mechanism and the driving wheel, the driving motor directly drives the driving wheel without the need of a gear shifting mechanism, the peak rotating speed of the driving motor can be used to achieve the effect similar to gear shifting, and the feeling of jerk during gear shifting of the traditional bicycle with the gear shifting mechanism can be avoided, and the riding experience can be improved. The resistance device provides resistance to the pedaling mechanism, which can simulate the pedaling resistance and keep the riding fun of the user.

[0014] Further, the driving motor and the driving wheel are connected through a transmission mechanism arranged between the driving motor and the driving wheel.

[0015] The transmission mechanism comprises a circulating unit, and further comprises a first transmission wheel and a second transmission wheel arranged on the output shaft of the driving motor and the wheel shaft of the driving wheel, respectively, and the two transmission wheels are connected through the circulating unit.

[0016] The transmission mechanism further comprises a tensioning wheel for tensioning the circulating unit, and the tensioning wheel is connected to the frame of the bicycle through a support.

[0017] The second data collection element comprises a first strain gauge arranged on the support. In one scheme, the first strain gauge is connected to the control unit through a processing unit, the processing unit can process the electric signal generated by the first strain gauge to obtain the torque data, and then feed back the torque data to the control unit; in the second scheme, the control unit can directly process the electric signal generated by the first strain gauge, and the first strain gauge is directly connected to the control unit.

[0018] The circulating unit can be in the form of a chain, a synchronous belt or a common belt, and the first transmission wheel and the second transmission wheel are a chain wheel, a synchronous wheel or a belt wheel. When the driving motor drives the driving wheel to rotate, the circulating unit has a straightening tendency, and the reaction force of the circulating unit on the tensioner will cause the bracket to deform. The greater the driving torque of the driving motor, the greater the deformation of the bracket. The first strain gauge is installed on the bracket, and the collected data can effectively reflect the driving torque of the driving motor. Through experiments, the corresponding relationship between the deformation of the bracket and the driving torque is quantified, and the driving torque of the driving motor can be calculated according to the data generated by the first strain gauge in actual use. The driving torque is collected in this way.

[0019] In the prior art, the strain gauge is generally installed on a rotating part to obtain data, and power supply and data transmission are relatively complex. In the present application, the first strain gauge is installed on the bracket, and data can be collected directly, which is low in cost and convenient.

[0020] Of course, the torque can also be collected from the rotating part as described above.

[0021] Further, specifically, the transmission mechanism between the driving motor and the driving wheel comprises a torque deformation sleeve, and the second data collection element comprises a second strain gauge fixed on the torque deformation sleeve; the torque deformation sleeve rotates with the output shaft of the driving motor or with the axle of the driving wheel; in addition, in order to realize the collection of data generated by the strain gauge, the second data collection element further comprises a first PCB board rotating with the torque deformation sleeve and a second PCB board fixed relative to the frame, and coils are arranged on the first PCB board and the second PCB board, so that the first PCB board and the second PCB board can be wirelessly powered and wirelessly communicated. Specifically, the second PCB board wirelessly powers the first PCB board through electromagnetic induction between the coils, and the first PCB board wirelessly transmits torque data to the second PCB board based on the same electromagnetic induction principle. The second PCB board is connected to the control unit, and the control unit can obtain the torque data from the second PCB board.

[0022] Further, the circulating unit is a chain or a synchronous belt, and the first transmission wheel and the second transmission wheel are a chain wheel or a belt wheel. The circulating unit is preferably a synchronous belt, which has the characteristics of light weight, long service life, easy maintenance and less influence of riding environment.

[0023] Further, a gear operating unit is further included, and the gear operating unit is connected to the control unit. Preferably, the gear operating unit is installed on a handle of the bicycle, and a rider can operate the gear operating unit to select one of a plurality of gears to obtain a simulated gear shifting effect, each gear corresponding to a conversion speed ratio, and the control unit calculates a target rotating speed of the drive motor based on the conversion speed ratio corresponding to the gear and a frequency of the motion of the human power mechanism, and drives the drive motor to operate according to the target rotating speed.

[0024] Specifically, the gear operating unit can have a plurality of buttons corresponding to different gears, or have a knob rotatable to different preset angles to correspond to different gears, so that the user selecting the gear can simulate the speed ratio of different gears to achieve the effect of simulating the gear shifting of a gear box or a gear disc. Since the drive motor has a high driving characteristic of a limit rotating speed, it can meet the rotating speed requirements of different gears, and can avoid the feeling of being stuck when the actual gear box or gear disc is shifted, so that the transition between before and after the gear shifting is smoother, and the experience is improved.

[0025] The application further provides a bicycle including the above-mentioned drive system.

[0026] The application further provides a drive method of a bicycle based on the above-mentioned drive system of the bicycle, and the method is implemented by the control unit, and the method includes the following steps S101-S104:

[0027] In step S101, data collected by the first data collection element is obtained to obtain frequency data (pedaling frequency data). Here, the frequency data can be directly or indirectly obtained according to the data collected by the first data collection element.

[0028] In step S102, a target rotating speed of the drive motor is determined according to the frequency data, and the drive motor is driven to operate.

[0029] In step S103, data collected by the second data collection element is obtained to obtain torque data. Here, the torque data can be directly or indirectly obtained according to the data collected by the second data collection element.

[0030] In step S104, the resistance device is controlled to generate resistance to the human power mechanism according to the torque data, so that the resistance matches the torque data.

[0031] Further, in step S102, the target rotating speed of the drive motor is determined according to the frequency data, including the following steps S201-S202:

[0032] Step S201, obtaining the current virtual gear information to obtain the conversion ratio; here, the conversion ratio is the simulated transmission ratio of the gearbox or the transmission disc, and the virtual gear information is selected and determined by the user through the gear control unit; it can also be selected and determined by the control unit according to the situation.

[0033] Step S202, calculating the target speed according to the frequency data and the conversion ratio. When the frequency data is the pedal frequency, the product of the frequency data and the conversion ratio is directly calculated to obtain the target speed.

[0034] Further, in actual use, a sensor for detecting the actual speed of the driving wheel can also be provided, and the actual speed of the driving wheel can also be detected by GPS, Beidou and other positioning means, and the actual speed of the driving wheel is calculated according to the actual speed; the resistance device can generate electricity, which can be an electric motor or a generator, and the method further comprises:

[0035] When the actual speed of the driving wheel is greater than the target speed, the kinetic energy is recovered to convert the kinetic energy input by the human mechanism into electric energy to supply the battery pack and / or control the driving motor to stop running. In this way, when the bicycle is in a downhill section, the input kinetic energy of the human mechanism is converted into electric energy, and at the same time, the driving motor is avoided from idling and wasting electric energy.

[0036] Beneficial effects: the driving system of the bicycle, the bicycle and the driving method have the following advantages:

[0037] On the one hand, the control unit collects the riding data of the rider through the first data collection element, and changes the speed of the driving motor according to the riding data of the rider, so that the running speed of the bicycle changes with the running frequency of the human mechanism of the rider. Since the driving motor has a very high speed range, the bicycle has a very large speed range. On the other hand, the control unit directly or indirectly obtains the torque data according to the data generated by the second data collection element, calculates the riding resistance according to the torque data, and changes the coil current of the resistance device according to the riding resistance to generate magnetic resistance to the human mechanism, thereby simulating the riding resistance and keeping the riding fun. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structural schematic diagram of a bicycle;

[0039] Figure 2 is a structural diagram of the driving system part of the bicycle;

[0040] Figure 3 is a structural diagram of a torque collection device;

[0041] Figure 4 is a structural diagram of a resistance device;

[0042] Figure 5 This is a structural diagram of another resistance device;

[0043] Figure 6 Schematic diagram of the driving method;

[0044] Figure 7 It is a partial flow chart of the driving method;

[0045] Figure 8 Schematic diagram of part of the driving method.

[0046] In the figure: A1-driving wheel; A2-frame; 1-human mechanism; 21-first data acquisition element; 22-second data acquisition element; 22a-first strain gauge; 22b-second strain gauge; 22c-first PCB board; 22d-second PCB board; 3-driving motor; 4-resistance device; 41-electromagnet; 42-rotating component; 42a-unit body; 43-friction disc; 44-friction member; 45-driving mechanism; 5-battery pack; 6-transmission mechanism; 61-first transmission wheel; 62-second transmission wheel; 63-circulation unit; 64-tensioning pulley; 65-bracket; 7-gear operation unit; 10-control unit. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] like Figures 1-2 The bicycle shown in the figure has a drive system comprising a human-powered mechanism 1, a drive motor 3, a battery pack 5, a control unit 10, and a data acquisition system. The drive motor 3 is electrically connected to the battery pack 5 and is in driving connection with the drive wheel A1 of the bicycle. There is no transmission connection between the drive motor 3 and the human-powered mechanism 1. The drive motor 3 and the data acquisition system are both connected to the control unit 10.

[0049] The drive system further includes a resistance device 4; the resistance device 4 is connected to the control unit 10 and the battery pack 5; the resistance device 4 can generate resistance to the human-powered mechanism 1, and the resistance generated by the resistance device 4 can be changed by the control unit 10;

[0050] The data acquisition system includes a first data acquisition element 21 and a second data acquisition element 22; the data collected by the first data acquisition element 21 can reflect the movement frequency of the human mechanism 1, that is, the collected data is the movement frequency itself or data related to the movement frequency; the data collected by the second data acquisition element 22 can reflect the driving torque of the drive motor 3 on the drive wheel A1, that is, the collected data is the driving torque itself or data related to the driving torque.

[0051] The human power mechanism 1 is preferably a traditional pedal mechanism, which is composed of a pedal unit, a crank and a middle shaft. The human power mechanism 1 can also be in other forms, such as a handle for the disabled to rotate, or a self-resetting pedal unit with reciprocating motion within a fixed angle. In this application, the pedal mechanism is taken as an example for illustration, and the frequency of the motion of the human power mechanism 1, i.e. the pedal frequency, and the first data acquisition element 21 are a Hall sensor or other sensor for detecting the rotation frequency.

[0052] Preferably, the resistance device 4 is a magnetic resistance device based on magnetic force, which has a coil generating an electromagnetic field after being electrified, and further includes a magnetic metal or a permanent magnet capable of interacting with the coil after being electrified.

[0053] Preferably, as a structural form, the resistance device 4 is an electric motor or a generator, which is composed of a stator and a rotor, one of which contains a winding composed of a coil, and the other contains a circumferential array of permanent magnets. When resistance is needed to be generated to the human power mechanism 1, the winding is electrified to make the resistance device 4 generate resistance to hinder the operation of the human power mechanism 1. When the electric motor or the generator is used as the resistance device 4, it can convert the kinetic energy input by the human power mechanism 1 into electric energy to charge the battery pack 5 under certain working conditions.

[0054] As a second structural form, as shown in Figure 4 the resistance device 4 can include an electromagnet 41 containing a coil, and further include a rotating component 42 with a unit body 42a of a magnetic metal or a permanent magnet, the electromagnet 41 is installed offset from the center of the rotating component 42, and when it is electrified, it can act on the magnetic metal or the permanent magnet on the rotating component 42 to generate resistance to the human power mechanism 1 through attractive force or repulsive force.

[0055] In addition, the resistance device 4 can also be a device based on friction, as shown in Figure 5 which includes a friction disc 43 connected to the human power mechanism, and further includes a friction piece 44 and a driving mechanism 45 driving the friction piece 44 to approach or move away from the friction disc 43, and the control unit 10 controls the driving mechanism 45 to operate to change the size of the friction to generate different sizes of resistance to the human power mechanism 1.

[0056] When the driving system is in operation, on the one hand, the control unit 10 determines the target speed through the data collected by the first data acquisition element 21, and changes the rotation speed of the driving motor 3 according to the target speed, so that the operating speed of the bicycle changes with the frequency of the rider pedaling the human power mechanism 1. On the other hand, the control unit 10 directly or indirectly obtains the torque data according to the data generated by the second data acquisition element 22, calculates the riding resistance according to the torque data, and changes the coil current of the coil assembly in the resistance device 4 according to the riding resistance, so as to generate magnetic resistance to the human power mechanism 1, thereby simulating the riding resistance and keeping the riding fun.

[0057] In the above scheme, by providing two motors, since there is no transmission connection between drive motor 3 and human-powered mechanism 1, and no transmission connection between human-powered mechanism 1 and drive wheel A1, drive motor 3 is directly connected to drive wheel A1, eliminating the need for a shift mechanism. The high peak speed of drive motor 3 can be utilized to achieve a similar shifting effect without the jerky shifting associated with traditional bicycles with shift mechanisms, thus enhancing the riding experience. The resistance device 4 provides resistance to human-powered mechanism 1, simulating riding resistance and maintaining the user's riding pleasure.

[0058] Preferably, the driving motor 3 and the driving wheel A1 transmit power via a transmission mechanism 6 connected between the two.

[0059] The transmission mechanism 6 includes a circulation unit 63; the transmission mechanism 6 also includes a first transmission wheel 61 and a second transmission wheel 62 respectively disposed on the output shaft of the drive motor 3 and the axle of the drive wheel A1, and power is transmitted between the two transmission wheels through the circulation unit 63;

[0060] like Figure 2 As shown, the transmission mechanism 6 further includes a tensioning wheel 64 for tensioning the circulation unit 63, and the tensioning wheel 64 is connected to the bicycle frame A2 via a bracket 65;

[0061] The second data acquisition element 22 includes a first strain gauge 22a mounted on the bracket 65. In one embodiment, the first strain gauge 22a is connected to the control unit 10 via a processing unit. The processing unit is capable of processing the electrical signal generated by the first strain gauge 22a to obtain torque data, and then feeding the torque data back to the control unit 10. In a second embodiment, the control unit 10 is capable of directly processing the electrical signal generated by the first strain gauge 22a, and the first strain gauge 22a is directly connected to the control unit 10.

[0062] The circulating unit 63 can be in the form of a chain, a synchronous belt or an ordinary belt, etc., and correspondingly, the first transmission wheel 61 and the second transmission wheel 62 are sprockets, synchronous wheels or pulleys. Since the driving motor 3 drives the driving wheel A1 to rotate, the circulating unit 63 has a tendency to straighten. The reaction force of the circulating unit 63 on the tensioning wheel 64 will cause the bracket 65 to deform. The greater the driving torque of the driving motor 3, the greater the deformation of the bracket 65. Figure 2 As shown, the first strain gauge 22a is mounted on the bracket 65, and the collected data can effectively reflect the driving torque of the drive motor 3. Through experiments, the corresponding relationship between the deformation of the bracket 65 and the driving torque is quantified. In actual use, the driving torque of the drive motor 3 can be calculated based on the data generated by the first strain gauge 22a. This method is used to collect driving torque.

[0063] In the prior art, the strain gauge is usually installed on the rotating part to obtain data, and the power supply and data transmission are relatively complex. In the present application, the first strain gauge 22a is installed on the bracket 65 to directly collect data, which is low in cost and convenient.

[0064] Of course, the torque collection can also obtain data from the rotating part as mentioned above.

[0065] Specifically, as shown in Figure 3 The second data collection element 22 includes a second strain gauge 22b fixed on the torque deformation sleeve 22e. The torque deformation sleeve rotates with the output shaft of the drive motor 3 or the axle of the drive wheel A1. In addition, in order to realize the collection of data generated by the strain gauge, the second data collection element 22 further includes a first PCB board 22c rotating with the torque deformation sleeve and a second PCB board 22d fixed relative to the frame A2. The second PCB board 22d and the first PCB board 22c are both provided with coils, so that the first PCB board 22c and the second PCB board 22d can be wirelessly powered and wirelessly communicated. Specifically, the second PCB board 22d wirelessly powers the first PCB board 22c through electromagnetic induction between the coils, and the first PCB board 22c wirelessly transmits torque data to the second PCB board 22d based on the electromagnetic induction principle. The second PCB board 22d is connected to the control unit 10, and the control unit 10 can obtain the torque data obtained by the second PCB board 22d.

[0066] Preferably, the circulating unit 63 is a chain or a synchronous belt, and the first transmission wheel 61 and the second transmission wheel 62 are chain wheels or belt wheels correspondingly. The circulating unit 63 is preferably a synchronous belt, which has the characteristics of light weight, long service life, easy maintenance, and less affected by the riding environment.

[0067] The drive system further includes a gear operating unit 7 connected to the control unit 10. Preferably, the gear operating unit 7 is installed on the handlebar A4 of the bicycle, and the rider can operate the gear operating unit 7 to select one of a plurality of gears to obtain a simulated gear shifting effect. Each gear corresponds to a conversion speed ratio, and the control unit 10 calculates the target speed of the drive motor 3 based on the conversion speed ratio corresponding to the gear and the motion frequency of the human power mechanism 1, and drives the drive motor 3 to operate accordingly.

[0068] Specifically, the gear control unit 7 can have multiple buttons corresponding to different gears, or have a knob rotatable to different preset angles to correspond to different gears, so that the user's selection of gears can simulate the speed ratio of different gears, achieving the effect of simulating the shifting of a gearbox or a variable speed disc. Due to the high driving characteristics of the driving motor 3, it can meet the speed requirements of different gears, and when simulating shifting, it can avoid the feeling of being stuck produced by the actual gearbox or variable speed disc, making the transition between before and after shifting smoother and improving the experience.

[0069] A driving method of a bicycle based on the driving system of the bicycle described above, the method being implemented by the control unit 10, as Figure 6 As shown, the method comprises the following steps S101-S104 (the step number is not used to limit the implementation order of the steps):

[0070] Step S101, obtaining the data collected by the first data collection element 21 to obtain frequency data (pedal frequency data); here, the frequency data can be directly or indirectly obtained from the data collected by the first data collection element 21;

[0071] Step S102, determining the target speed of the driving motor 3 according to the frequency data, and driving the driving motor 3 to operate;

[0072] Step S103, obtaining the data collected by the second data collection element 22 to obtain torque data; here, the torque data can be directly or indirectly obtained from the data collected by the second data collection element 22;

[0073] Step S104, controlling the resistance device 4 to generate resistance to the human power mechanism 1 according to the torque data, so that the resistance matches the torque data.

[0074] Preferably, the step S102 of determining the target speed of the driving motor 3 according to the frequency data comprises the following steps S201-S202:

[0075] Step S201, obtaining the current virtual gear information to obtain a conversion ratio; here, the conversion ratio is the gear ratio of the simulated gearbox or variable speed disc, and the virtual gear information is selected and determined by the user through the gear control unit 7, or can be selected and determined by the control unit according to the situation.

[0076] Step S202, calculating the target speed according to the frequency data and the conversion ratio. When the frequency data is the pedal frequency, the product of the frequency data and the conversion ratio is directly calculated to obtain the target speed.

[0077] A complete process thereof is as follows:

[0078] As Figure 7As shown, the driving motor 3 is powered to output driving torque to the driving wheel A1 → the driving wheel A1 receives external resistance feedback to the circulating unit 63 → the support 65 of the tensioner of the circulating unit 63 or the torque deformation sleeve 22e is deformed → the strain gauge collects deformation data → the deformation data is converted into torque data → the resistance device 4 generates resistance to the human mechanism 1 according to the torque data to simulate the natural pedaling feeling.

[0079] As shown, the second data acquisition element 22 collects pedal frequency data → the conversion ratio with the driving motor is adjusted manually or automatically → electronic stepless speed change is realized by the driving motor output torque. Figure 8

[0080] Preferably, in actual use, a sensor for detecting the actual speed of the driving wheel A1 can be provided, and the actual speed of the driving wheel A1 can also be detected by GPS, Beidou, etc. positioning means, and the actual speed of the driving wheel A1 is calculated according to the actual vehicle speed; the resistance device 4 can generate electricity, which can be in the form of a motor or a generator, and the method further comprises:

[0081] When the actual speed of the driving wheel A1 is greater than the target speed, kinetic energy is recovered to convert the input kinetic energy of the human mechanism 1 into electrical energy to be delivered to the battery pack 5 and / or to control the driving motor 3 to stop running. In this way, when the bicycle is on a downhill section, the input kinetic energy of the human mechanism 1 can be converted into electrical energy, and at the same time, the driving motor 3 is prevented from idling and wasting electrical energy. The driving wheel A1 and the driving motor 3 have a one-way clutch, so that the driving wheel A1 can be driven to run, and the driving wheel A1 cannot drive the driving motor 3 to run in reverse, preventing the driving motor 3 from forming resistance to the driving wheel A1 on a downhill section.

[0082] The above is only the preferred embodiment of the present application, and it should be noted that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.​

Claims

1. A drive system of a bicycle, comprising a human power mechanism (1), a drive motor (3), a battery pack (5), a control unit (10) and a data acquisition system; the drive motor (3) is electrically connected with the battery pack (5) and drivingly connected with a drive wheel (A1) of the bicycle; the drive motor (3) and the data acquisition system are both connected with the control unit (10); characterized in that: it further comprises a resistance device (4); the resistance device (4) is connected with the control unit (10) and the battery pack (5); the resistance device (4) can generate resistance to the human power mechanism (1), and the resistance generated thereby can be changed by the control unit (10); the data acquisition system comprises a first data acquisition element (21) and a second data acquisition element (22); the data acquired by the first data acquisition element (21) can reflect the motion frequency of the human power mechanism (1); the data acquired by the second data acquisition element (22) can reflect the driving torque of the drive motor (3) to the drive wheel (A1); the control unit (10) can implement the following steps: acquiring the data acquired by the first data acquisition element (21) to obtain frequency data; determining the target rotating speed of the drive motor (3) according to the frequency data, and driving the drive motor (3) to operate; acquiring the data acquired by the second data acquisition element (22) to obtain torque data; controlling the resistance device (4) to generate resistance to the human power mechanism (1) according to the torque data.

2. Drive system for a bicycle according to claim 1, characterized in that The resistance device (4) is a magnetic resistance device based on magnetic force, which has a coil generating an electromagnetic field after being energized, and further comprises a magnetic metal or a permanent magnet capable of interacting with the coil after being energized; or the resistance device (4) is a friction resistance device, and the control unit (10) can change the friction resistance generated by the resistance device (4).

3. Drive system for a bicycle according to claim 2, characterized in that The resistance device (4) is an electric motor or a generator.

4. The bicycle drive system according to claim 1, wherein: The drive motor (3) and the drive wheel (A1) are connected through a transmission mechanism (6) spanning therebetween to transmit power; The transmission mechanism (6) comprises a circulating unit (63); Further comprising a tensioning wheel (64) tensioning the circulating unit (63), the tensioning wheel (64) is connected with the frame (A2) of the bicycle through a support (65); The second data acquisition element (22) comprises a first strain gauge (22a) mounted on the support (65).

5. The drive system of a bicycle according to claim 1, characterized in that, The transmission mechanism between the drive motor (3) and the drive wheel (A1) comprises a torque deformation sleeve, and the second data acquisition element (22) comprises a second strain gauge (22b) fixed on the torque deformation sleeve; the second data acquisition element (22) further comprises a first PCB board (22c) rotating with the torque deformation sleeve and a second PCB board (22d) fixed relative to the frame (A2), and the first PCB board (22c) and the second PCB board (22d) can perform wireless power supply and wireless communication therebetween.

6. The drive system of a bicycle according to claim 1, characterized in that, Further comprising a gear shifting operating unit (7), the gear shifting operating unit (7) is connected with the control unit (10).

7. Bicycle, characterized in that It comprises the drive system of any one of claims 1-6.

8. A driving method of a bicycle based on a drive system of the bicycle, characterized in that, The drive system comprises a human power mechanism (1), a drive motor (3), a battery pack (5), a control unit (10), and a data acquisition system; the drive motor (3) is electrically connected with the battery pack (5) and drivingly connected with a drive wheel (A1) of the bicycle; the drive motor (3) and the data acquisition system are both connected with the control unit (10); The drive system further comprises a resistance device (4); the resistance device (4) is connected with the control unit (10) and the battery pack (5); the resistance device (4) can generate resistance to the human power mechanism (1), and the resistance generated thereby can be changed by the control unit (10); The data acquisition system comprises a first data acquisition element (21) and a second data acquisition element (22); the data acquired by the first data acquisition element (21) can reflect the motion frequency of the human power mechanism (1); the data acquired by the second data acquisition element (22) can reflect the driving torque of the drive motor (3) to the drive wheel (A1); The method comprises: acquiring the data acquired by the first data acquisition element (21) to obtain frequency data; determining a target rotating speed of the drive motor (3) according to the frequency data, and driving the drive motor (3) to operate; acquiring the data acquired by the second data acquisition element (22) to obtain torque data; controlling the resistance device (4) to generate resistance to the human power mechanism (1) according to the torque data.

9. The drive method of a bicycle according to claim 8, wherein, The determination of the target rotating speed of the drive motor (3) according to the frequency data comprises: acquiring current virtual gear information to obtain a conversion ratio; calculating the target rotating speed according to the frequency data and the conversion ratio.

10. The drive method of a bicycle according to claim 8, wherein The resistance device (4) can generate electricity, and the method further comprises: when the actual rotating speed of the drive wheel (A1) is greater than the target rotating speed, kinetic energy is recovered to convert the kinetic energy input by the human power mechanism (1) into electrical energy to be delivered to the battery pack (5) and / or to control the drive motor (3) to stop operating.

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