CN117125185A - Driving device and method for electric bicycle - Google Patents
Driving device and method for electric bicycle Download PDFInfo
- Publication number
- CN117125185A CN117125185A CN202210555433.8A CN202210555433A CN117125185A CN 117125185 A CN117125185 A CN 117125185A CN 202210555433 A CN202210555433 A CN 202210555433A CN 117125185 A CN117125185 A CN 117125185A
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- 238000000034 method Methods 0.000 title claims description 20
- 230000001133 acceleration Effects 0.000 claims abstract description 28
- 238000004364 calculation method Methods 0.000 description 23
- 230000000694 effects Effects 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
Abstract
The present invention relates to a power assisting mode of an electric bicycle, which can doubly judge the intention of a user when the electric bicycle needs to be accelerated in emergency such as starting or overtaking, and can safely operate the electric bicycle while providing necessary acceleration force by preventing the user from suddenly accelerating unintentionally.
Description
Technical Field
The invention relates to an electric bicycle, in particular to a power-assisted running technology of a chainless electric bicycle.
Background
The electric bicycle uses an electric drive motor to assist a person's power or drive the bicycle. The manner in which the force of the motor is used to assist the person in pedaling to drive the wheels is referred to as pedal assist system (Pedal Assistance System, PAS) mode, and the manner in which the pulling handle drives the wheels only by the force of the motor is referred to as Throttle (Throttle) mode.
The Throttle (Throttle) mode pushes the electric bicycle only by the power of the motor, and thus, the same pedal or a chain for transmitting the force of the pedal as the existing bicycle is not required. However, there are electric bicycles in which a bicycle without pedals is provided with a manner of charging a battery by rotating the pedals, even though the bicycle is a bicycle without a chain.
The chainless electric bicycle is characterized in that the rotation speed of a pedal stepped on by a user is identified, and the speed of a motor is controlled according to the ratio of the speed. Since the chain is not connected to the pedal, no load is applied. Accordingly, a generator connected to the pedal is controlled to generate a load feeling of the pedal, such as a bicycle with a chain. If the load of the pedals is controlled according to the speed of the electric bicycle, the user feels a pedal feel similar to that of a general bicycle having a chain.
However, if a pedal feel similar to that of a bicycle having a chain is generated in an electric bicycle without a chain, there is a problem in that more power is required compared to normal running when acceleration is required for quick departure or overtaking.
The inventor of the present invention has made an effort to solve the driving problem of such a prior art chainless electric bicycle. The invention completes an electric bicycle through a great deal of effort, and can obtain the needed acceleration feeling without applying too much power when the electric bicycle needs emergency acceleration (power assisting) driving.
Disclosure of Invention
Technical problem
The invention aims to provide a control device and a control method for a power assisting mode, which can provide power assisting mode when emergency acceleration is needed, such as starting or overtaking of an electric bicycle, thereby providing convenience for users and realizing safe running of the electric bicycle.
Meanwhile, other unspecified objects of the present invention will be further considered to the extent that it can be easily inferred from the following detailed description and effects thereof.
Means for solving the problems
An electric bicycle driving device according to an aspect of the present invention includes: a pedal sensing part for measuring the position or speed of the pedal; a wheel sensing part measuring a position or a speed of the driving wheel;
a drive control unit that controls a speed of a motor for driving the drive wheel according to a position difference or a speed difference between the pedal and the drive wheel; wherein the drive control unit increases the control current of the motor in the assist mode over a certain period of time compared to the previous travel in accordance with the assist control by the user.
An electric bicycle driving device according to an aspect of the present invention includes: a pedal sensing part for measuring the position or speed of the pedal; a wheel sensing part measuring a position or a speed of the driving wheel;
a drive control unit that controls a speed of a generator for driving the drive wheel according to a position difference or a speed difference between the pedal and the drive wheel; wherein the drive control unit reduces the control current of the generator in the assist mode in comparison with the previous travel for a predetermined period of time in accordance with the assist control by the user.
The drive control portion enters the assist mode only when an assist control button of the electric bicycle is pressed for more than a predetermined time and a pedal speed measured by the pedal sensing portion becomes faster than before the assist control button is pressed.
After the assist mode is controlled for the predetermined time, the drive control portion controls that the assist mode cannot be operated for the predetermined time.
The drive control unit terminates the assist mode when the pedal speed measured by the pedal sensing unit is 0 or when the operation of the brake lever of the electric bicycle is detected.
According to one aspect of the present invention, a driving method of an electric bicycle includes: measuring the position or speed of the pedal; a step of measuring the position or speed of the drive wheel; a step of calculating a speed of a motor for driving the driving wheel based on a position difference or a speed difference between the pedal and the driving wheel; a step of generating a motor current for controlling the motor based on the calculated speed; judging whether the acceleration mode is a boosting mode for acceleration; and generating additional current of the motor to accelerate if the judging result is the power-assisted mode.
According to one aspect of the present invention, a driving method of an electric bicycle includes: measuring the position or speed of the pedal; a step of measuring the position or speed of the drive wheel; a step of calculating a speed of a generator for driving the driving wheel based on a position difference or a speed difference between the pedal and the driving wheel; a step of generating a generator current for controlling the generator according to the calculated speed; judging whether the acceleration mode is a boosting mode for acceleration; and generating a reduced current of the generator if the judgment result is the power-assisted mode.
In the step of determining whether the power assist mode is the power assist mode, the power assist mode is determined only when a power assist control button of the electric bicycle is pressed for more than a predetermined time and the measured pedal speed becomes faster than before the power assist control button is pressed.
In the step of determining whether the assist mode is the assist mode, the assist mode cannot be entered after the previous assist mode is completed, if a predetermined time has not elapsed.
In the step of generating the additional current of the motor or the step of generating the reduced current of the generator, when the pedal speed is 0 or the operation of the brake lever of the electric bicycle is detected, the additional current of the motor or the reduced current of the generator is not generated and the assist mode is stopped.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the invention, the following effects are achieved: the operation of the assist mode may be performed in two or more steps as desired by the user to confirm that the user intends to operate the assist mode, thereby providing a safe and convenient assist mode.
On the other hand, it is to be noted that, even if effects are not explicitly referred to herein, effects described in the following description and temporary effects expected by technical features of the present invention are to be regarded as descriptions in the description of the present invention.
Drawings
Fig. 1 is a schematic structural view of an electric bicycle driving apparatus according to a preferred embodiment of the present invention.
Fig. 2 is a more detailed structural schematic diagram of the drive control section according to a preferred embodiment of the present invention.
Fig. 3 shows the trend of the additional driving current of the motor according to a preferred embodiment of the present invention.
Fig. 4 is a flow chart illustrating a driving method of an electric bicycle according to a preferred embodiment of the present invention.
Fig. 5 is a more detailed structural schematic diagram of a driving control section according to another preferred embodiment of the present invention.
Fig. 6 shows a variation trend of a driving current of a generator according to another preferred embodiment of the present invention.
Fig. 7 is a flow chart illustrating a driving method of an electric bicycle according to another preferred embodiment of the present invention.
The accompanying drawings are used as reference examples for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereto.
Detailed Description
Hereinafter, the structure of the present invention introduced by various embodiments of the present invention and effects produced by the structure will be described with reference to the accompanying drawings. In describing the present invention, a detailed description thereof will be omitted when the subject matter of the present invention is unnecessarily obscured, as the relevant common general knowledge that is clearly known to a person skilled in the art.
The terms "first," "second," and the like may be used to describe various structural features, but these features are not limited to the terms. The above terminology is merely intended to distinguish one feature from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention. Also, the singular can include the plural unless the context clearly indicates otherwise. Unless otherwise defined, terms used in embodiments of the present invention may have the same meaning as commonly understood by one having ordinary skill in the art to which this disclosure pertains.
Hereinafter, the structure of the present invention introduced by various embodiments of the present invention and effects produced by the structure will be described with reference to the drawings.
Fig. 1 is a schematic structural view of an electric bicycle driving apparatus according to a preferred embodiment of the present invention.
The electric bicycle driving apparatus 1 for driving an electric bicycle according to the present invention includes a pedal sensing portion 10, a wheel sensing portion 20, and a driving control portion 30.
The pedal sensing portion 10 measures the position or speed of a pedal for rotating the generator 2.
The wheel sensing portion 20 measures the position or speed of the drive wheel. The driving wheel may be connected to the pedals with a chain and may be driven by means of a motor 3, in the case of a chainless electric bicycle, the driving wheel being driven only by the motor 3.
The drive control section 30 generates a current for driving the motor 3 according to the position or speed of the pedal and the position or speed of the drive wheel.
Fig. 2 is a more detailed structural schematic diagram of the drive control section according to a preferred embodiment of the present invention.
The drive control section 30 according to the present invention includes a generator current calculation section 310, a motor current calculation section 320, and an additional current calculation section 330. For this purpose, the drive control section 30 includes one or more processors and a memory.
As with a normal bicycle, the electric bicycle controls the motor 3 such that the speed increases with an increase in pedal speed. For this purpose, a current for controlling the motor 3 is generated based on a phase difference between the position or speed of the pedal and the position or speed of the driving wheel.
In the case where the position of the pedal and the position of the drive wheel are employed, the motor current calculation portion 320 calculates the current for driving the motor 3 by using the difference between the position of the pedal and the position of the motor 3 connected to the drive wheel. In this case, a gear ratio such as a general bicycle may be considered, and the degree of assistance of the motor may be considered according to the running mode.
In order to implement the emergency acceleration by applying the assist mode, the drive control section 30 may control the generator current calculation section 310 to generate a current larger than the pedal position.
Another method of applying the assist mode is that the additional current calculating part 330 generates additional current to the driving currents of the motor 3 calculated by the generator current calculating part 310 and the motor current calculating part 320 to achieve emergency acceleration.
In this way, the motor 3 can be driven by the motor drive current that is finally calculated, so that the drive control section 30 can apply the assist mode to the motor 3.
The calculation process is also very similar in the case where the speed of the pedal and the speed of the motor are used instead of the position of the pedal and the position of the motor. Based on the difference between the pedal speed and the motor speed, the motor current calculation section 320 calculates a basic motor 3 drive current, and the generator current calculation section 310 and the additional current calculation section 330 calculate a motor additional current for the assist mode.
In order to enter the assist mode for emergency acceleration, it is first necessary to confirm the user's intention to enter the assist mode.
When the power-assist mode is entered simply by a power-assist mode button or the like, if the user touches the button carelessly, the user may feel a risk of accident or inconvenience due to a sudden departure or the like.
Thus, to enter the boost mode, an algorithm may be applied for doubly, tripletically confirming the intent of the user. For example, in a state in which a power-assist button of a human-machine interface (HMI) of an electric bicycle is pressed for 3 seconds or more, the power-assist mode may be activated only when the pedal speed is accelerated to a certain level or more than before. Alternatively, the assist mode may be activated when the brake lever is pulled for a long time, when the pedal is rapidly stepped while the brake is operated and the brake lever is continuously pulled for 2 or 3 times instantaneously. In a state where the assist mode is activated, the drive control unit 30 may display or sound on the HMI that the assist mode is running.
When the assist mode is entered, the drive control unit 30 calculates a basic motor 3 drive current by the motor current calculation unit 320, and generates an additional current for driving the motor by the generator current calculation unit 310 and the additional current calculation unit 330, thereby enabling acceleration. For safety, the drive control section 30 may perform the generation of the additional current and stop the assist mode only for a predetermined period of time. In order to prevent the misuse of the assist mode and reduce battery consumption, the assist mode may be restricted to be reused after a predetermined time has elapsed after the use of the one-time assist mode.
The magnitude of the current for assisting force generated by the drive control portion 30 may be different depending on the current running speed. For example, about 20% of the additional current is generated at low speed and about 30% of the additional current is generated at high speed. By generating an additional current proportional to the current running speed, the risk of accidents due to sudden accelerations or impacts on the user can be reduced. Also, the additional current of the motor 3 may be limited so that the speed does not increase above a predetermined maximum speed even when 20% or 30% of the additional current is generated.
Fig. 3 shows the trend of the additional driving current of the motor according to a preferred embodiment of the present invention.
When an additional driving current for acceleration is suddenly applied to the motor, an impact may be generated to the electric bicycle. Thus, the additional current may be gradually increased or gradually decreased.
As shown in fig. 3, when the assist mode is started, the additional current for assist increases to the target current for a predetermined 1 st time (t 1), and decreases to 0 for a predetermined 2 nd time (t 2) before the assist mode is ended. The amount of additional current that increases or decreases during time 1 or time 2 may be linear, as shown in fig. 3; but may also be non-linear such as logarithmic or exponential functions.
Although the assist mode is set to be terminated after a predetermined time has elapsed, the assist mode may be terminated according to the user's intention even during the operation of the assist mode. For example, the assist mode may be terminated when the pedal speed measured by the pedal sensing portion 10 is 0 because the user does not step on the pedal, or when the user operates and starts the brake.
Fig. 4 is a flow chart illustrating a rearranged driving method of an electric bicycle according to a preferred embodiment of the present invention.
To drive the electric bicycle, first, the position or speed of the pedal is received (S110), and then, the position or speed of the wheel is received (S120).
The drive control portion 30 calculates the speed of the motor 3 for driving the electric bicycle based on the received position or speed difference between the pedal and the drive wheel (S130), and generates a motor drive current accordingly (S140).
Whether to enter the assist mode is determined according to the user intention (S150), and if the assist mode is the assist mode, an additional current is generated (S160).
In order to prevent the user from unintentionally entering the assist mode, the stage of performing the second and third steps of judging the user's assist intention may be passed.
The motor additional current for assistance can be varied depending on the current driving speed, and the maximum speed can be limited for safety. Also, the current may be gradually increased or gradually decreased at the start and end of the assistance to prevent abrupt assistance. The details are the same as before.
The motor additional current for assistance can be varied depending on the current driving speed, and the maximum speed can be limited for safety. Also, the current may be gradually increased or gradually decreased at the start and end of the assistance to prevent abrupt assistance.
After a predetermined time has elapsed, the assist mode is set to be automatically terminated, and may be set not to be started again for a predetermined time after termination.
In addition, even in the case that the user starts the brake or does not step on the pedal during the operation of the assist mode, the assist mode can be terminated in advance.
According to the driving device and the method for the power-assisted control of the electric bicycle, the following effects can be achieved: additional current can be supplied to the motor when necessary to achieve the acceleration required by the user and to prevent the danger of sudden acceleration.
Fig. 5 is a more detailed structural schematic diagram of a driving control section according to another preferred embodiment of the present invention.
The drive control section 30 according to the present invention includes a generator current calculation section 310, a motor current calculation section 320, and a reduced current calculation section 340. For this purpose, the drive control section 30 includes one or more processors and a memory.
Electric bicycles require a larger driving force in the case of hillsides, upward slopes, and the like. That is, in the case of hills, slopes, and the like, the force applied to the pedal is larger than that applied to a flat ground. To solve this problem, the drive control section 30 according to the present invention generates a current for controlling the generator 2 based on a phase difference between the position or speed of the pedal and the position or speed of the drive wheel.
In the case where the position of the pedal and the position of the driving wheel are employed, the generator current calculating section 310 calculates the current for driving the generator 2 by using the difference between the position of the pedal and the position of the motor 3 connected to the driving wheel. In this case, a gear ratio such as a general bicycle may be considered, and the degree of assistance of the motor 3 may be considered according to the running mode.
In order to implement the emergency acceleration by applying the assist mode, the drive control section 30 may control the generator current calculation section 310 to generate a current larger than the pedal position.
Another method of applying the assist mode is to reduce the driving current of the generator 2 calculated by the generator current calculating section 310 and the motor current calculating section 320 by the current reducing section 340 to achieve emergency acceleration.
In this way, the motor 3 can be driven by the motor drive current that is finally calculated, so that the drive control section 30 can apply the assist mode to the motor 3.
The calculation process is also very similar in the case where the speed of the pedal and the speed of the motor are used instead of the position of the pedal and the position of the motor. Based on the difference between the speed of the pedal and the speed of the motor, the generator current calculation section 310 calculates a basic generator 2 drive current, and the motor current calculation section 320 and the reduced current calculation section 340 calculate a generator reduced current for the assist mode.
In order to enter the assist mode for emergency acceleration, it is first necessary to confirm the user's intention to enter the assist mode. The details thereof are the same as those described above.
When the assist mode is entered, the drive control unit 30 calculates a basic drive current of the generator 2 by the generator current calculation unit 310, and generates a reduced current for driving the generator by the motor current calculation unit 320 and the reduced current calculation unit 340, thereby enabling acceleration. For safety, the drive control section 30 may perform the generation of the reduced current and stop the assist mode only for a predetermined period of time. In order to prevent the misuse of the assist mode and reduce battery consumption, the assist mode may be restricted to be reused after a predetermined time has elapsed after the use of the one-time assist mode.
The magnitude of the current for assisting force generated by the drive control portion 30 may be different depending on the current running speed. For example, about 20% reduced current is produced at low speed and about 30% reduced current is produced at high speed. By generating a reduced current proportional to the current running speed, the risk of an accident due to abrupt acceleration or impact to the user can be reduced. Also, the reduced current of the generator 2 may be limited so that the speed does not increase above a predetermined maximum speed even when 20% or 30% of the reduced current is generated.
Fig. 6 shows a variation trend of a driving current of a generator according to another preferred embodiment of the present invention.
When a reduced driving current for acceleration is suddenly applied to the generator, an impact may be generated to the electric bicycle. Thus, the generator drive current may be gradually reduced or gradually restored.
As shown in fig. 6, at the start of the assist mode, the decrease current for assist is decreased to the target current for a predetermined 3 rd time (t 3), and is increased to 0 for a predetermined 4 th time (t 4) before the end of the assist mode. The amount of decreasing current that increases or decreases in time 3 or 4 may be linear, as shown in fig. 6; but may also be non-linear such as logarithmic or exponential functions.
Although the assist mode is set to be terminated after a predetermined time has elapsed, the assist mode may be terminated according to the user's intention even during the operation of the assist mode. The details thereof are the same as those described above.
Fig. 7 is a flow chart illustrating a rearranged driving method of an electric bicycle according to another preferred embodiment of the present invention.
To drive the electric bicycle, first, the position or speed of the pedal is received (S210), and then, the position or speed of the wheel is received (S220).
The driving control part 30 calculates the speed of the generator 2 for driving the electric bicycle according to the received position or speed difference between the pedal and the driving wheel (S230), and generates a motor driving current accordingly (S240).
Whether to enter the assist mode is determined according to the user intention (S250), and if the assist mode is the assist mode, a reduction current is generated (S260).
In order to prevent the user from unintentionally entering the assist mode, the stage of performing the second and third steps of judging the user's assist intention may be passed. The details are the same as before.
The generator reduction current for assistance may be different depending on the current driving speed, and the maximum speed may be limited for safety. Also, the current may be gradually increased or gradually decreased at the start and end of the assistance to prevent abrupt assistance.
After a predetermined time has elapsed, the assist mode is set to be automatically terminated, and may be set not to be started again for a predetermined time after termination.
In addition, even in the case that the user starts the brake or does not step on the pedal during the operation of the assist mode, the assist mode can be terminated in advance.
According to the driving device and the method for the power-assisted control of the electric bicycle, the following effects can be achieved: the generator can be supplied with reduced current when necessary, thereby enabling the user to rotate the pedal with less force and preventing the danger of abrupt acceleration.
The scope of the invention is not limited to the descriptions and representations of the embodiments explicitly described above. Furthermore, it is again noted that the scope of the present invention is not limited by obvious variations or substitutions in the art to which the present invention pertains.
Claims (10)
1. An electric bicycle driving apparatus, comprising:
a pedal sensing part for measuring the position or speed of the pedal;
a wheel sensing part measuring a position or a speed of the driving wheel;
a drive control unit that controls a speed of a motor for driving the drive wheel according to a position difference or a speed difference between the pedal and the drive wheel;
wherein the drive control unit increases the control current of the motor in the assist mode over a certain period of time compared to the previous travel in accordance with the assist control by the user.
2. An electric bicycle driving apparatus, comprising:
a pedal sensing part for measuring the position or speed of the pedal;
a wheel sensing part measuring a position or a speed of the driving wheel;
a drive control unit that controls a speed of a generator for driving the drive wheel according to a position difference or a speed difference between the pedal and the drive wheel;
wherein the drive control unit reduces the control current of the generator in the assist mode in comparison with the previous travel for a predetermined period of time in accordance with the assist control by the user.
3. The electric bicycle driving apparatus according to claim 1 or 2, wherein the drive control portion enters the assist mode only when an assist control button of the electric bicycle is pressed for more than a predetermined time, and a pedal speed measured by the pedal sensing portion becomes faster than before the assist control button is pressed.
4. The electric bicycle driving apparatus according to claim 1 or 2, wherein the drive control portion controls the assist mode not to operate for a predetermined time after controlling the assist mode for the predetermined time.
5. The electric bicycle driving apparatus according to claim 1 or 2, wherein the drive control portion suspends the assist mode when the pedal speed measured by the pedal sensing portion is 0 or when it is detected that the brake lever of the electric bicycle is operated.
6. An electric bicycle driving method performed by a driving control portion of an electric bicycle including one or more processors and a memory, comprising:
measuring the position or speed of the pedal;
a step of measuring the position or speed of the drive wheel;
a step of calculating a speed of a motor for driving the driving wheel based on a position difference or a speed difference between the pedal and the driving wheel;
a step of generating a motor current for controlling the motor based on the calculated speed;
judging whether the acceleration mode is a boosting mode for acceleration; and
and generating additional current of the motor to accelerate if the judging result is a power-assisted mode.
7. An electric bicycle driving method performed by a driving control portion of an electric bicycle including one or more processors and a memory, comprising:
measuring the position or speed of the pedal;
a step of measuring the position or speed of the drive wheel;
a step of calculating a speed of a generator for driving the driving wheel based on a position difference or a speed difference between the pedal and the driving wheel;
a step of generating a generator current for controlling the generator according to the calculated speed;
judging whether the acceleration mode is a boosting mode for acceleration; and
and generating a reduced current of the generator if the judgment result is in the power-assisted mode.
8. The electric bicycle driving method according to claim 6 or 7, wherein in the step of determining whether or not to be the assist mode, the assist mode is determined only when an assist control button of the electric bicycle is pressed for more than a predetermined time and the measured pedal speed becomes faster than before the assist control button is pressed.
9. The electric bicycle driving method according to claim 6 or 7, wherein in the step of judging whether the power assist mode is the power assist mode, the power assist mode cannot be entered after the previous power assist mode is ended, if a predetermined time does not elapse.
10. The electric bicycle driving method according to claim 6 or 7, wherein in the step of generating the additional current of the motor or the step of generating the reduced current of the generator, when the pedal speed is 0 or the operation of the brake lever of the electric bicycle is detected, the additional current of the motor or the reduced current of the generator is not generated and the assist mode is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210555433.8A CN117125185A (en) | 2022-05-20 | 2022-05-20 | Driving device and method for electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210555433.8A CN117125185A (en) | 2022-05-20 | 2022-05-20 | Driving device and method for electric bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117125185A true CN117125185A (en) | 2023-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210555433.8A Pending CN117125185A (en) | 2022-05-20 | 2022-05-20 | Driving device and method for electric bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117125185A (en) |
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2022
- 2022-05-20 CN CN202210555433.8A patent/CN117125185A/en active Pending
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