Power control method of electric power-assisted bicycle based on torque sensor

Abstract

The invention discloses a torque sensor-based power control method for an electric power-assisted bicycle. The torque sensor-based power control method comprises the following steps of S1, acquiring a bicycle state, a manpower output torque, a motor output torque and gear information of an electronic transmission; s2, calculating a target motor output torque and a target electronic transmission gear based on the vehicle state, the manpower output torque, the motor output torque and the electronic transmission gear information; and S3, motor conveying and gear lifting of the electronic transmission are controlled based on the target motor output torque and the target electronic transmission gear. Based on the torque sensor and the gyroscope, automatic gear shifting of the vehicle and automatic gear adjustment of the electronic transmission are achieved, the automation degree of the vehicle is improved, the riding comfort is improved, the motor is protected, the service life of the motor is prolonged, and the output power of the motor and the electronic transmission are accurately matched; the motor and manpower output are kept in the optimal output state, and the battery life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of power-assisted bicycles, and in particular to a power control method of an electric power-assisted bicycle based on a torque sensor. Background Art

[0002] Nowadays, with the rapid development of modern transportation, bicycles, due to their environmental friendliness, convenience, and speed, have become a popular choice for short-distance travel. Furthermore, with the advancement of electronic technology, power-assisted bicycles have emerged, which are based on ordinary bicycles and have added power-assisted systems. These bicycles use the motor in the power-assisted system to provide assistance to the rider during riding, thereby reducing the rider's workload and making riding easier.

[0003] The motor power ratio of a traditional power-assisted bicycle is manually controlled by the rider, and the power ratio is adjusted by switching between different riding modes. Complex road conditions require frequent switching of riding modes, which reduces riding comfort.

[0004] Therefore, how to provide a power control method for an electric power-assisted bicycle based on a torque sensor to solve the problems existing in the prior art is of great significance to its application. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a power control method for an electric power-assisted bicycle based on a torque sensor, so as to solve the problem that complex driving conditions require frequent switching of riding modes, which reduces riding comfort.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A torque sensor-based power control method for an electric power-assisted bicycle comprises the following steps:

[0008] S1. Obtain vehicle status, human output torque, motor output torque, and electronic transmission gear position information;

[0009] S2, calculating a target motor output torque and a target electronic transmission gear position based on the vehicle state, the human output torque, the motor output torque, and the electronic transmission gear position information;

[0010] S3, controlling the motor transmission and the electronic transmission to shift gears based on the target motor output torque and the target electronic transmission gear.

[0011] Preferably, the vehicle state includes data such as vehicle speed, vehicle acceleration, and vehicle tilt angle variable, and the tilt angle variable and vehicle acceleration are detected using a gyroscope.

[0012] Preferably, the human output torque is detected by a torque sensor, and the torque sensor is installed at the center axis of the vehicle.

[0013] Preferably, the speed of the vehicle is detected by a speed sensor.

[0014] Preferably, the electronic transmission gear position is detected using a control circuit provided by the electronic transmission.

[0015] A power control device for a power-assisted bicycle, comprising:

[0016] memory for storing computer programs;

[0017] A processor is used to implement the steps of the power control method of the electric power-assisted bicycle when executing the computer program.

[0018] A power-assisted bicycle comprises a power-assisted bicycle body and a power control device of the power-assisted bicycle.

[0019] Preferably, the memory stores a database of vehicle status, human output torque and electronic transmission gear mid-mounted motor output power adjustment.

[0020] Preferably, the electronic transmission includes a flywheel and a chain lever, and the flywheel is equipped with a speed sensor.

[0021] Preferably, the memory stores a vehicle flywheel rotation speed and vehicle gear adjustment database.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention realizes automatic gear shifting of the vehicle and automatic gear adjustment of the electronic transmission based on the torque sensor and the gyroscope, thereby improving the degree of automation of the vehicle and enhancing riding comfort.

[0024] 2. The present invention realizes automatic output power adjustment of the vehicle's mid-mounted motor based on a torque sensor and a gyroscope, and cooperates with the gear shifting of the electronic transmission to protect the motor and increase its service life.

[0025] 3. The present invention can achieve precise coordination between the power-assisting motor output power and the electronic transmission, keeping both the motor and human output in an optimal output state, which is beneficial to improving battery life.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiment of the present application in conjunction with the accompanying drawings.

[0027] Based on the detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without inventive work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 is a flow chart of the method of the present invention;

[0030] Figure 2 This is the adjustment table for the mid-mounted motor and electronic transmission in the present invention;

[0031] Figure 3 is a system block diagram of the present invention;

[0032] Figure 4 Schematic diagram of the electronic transmission of the present invention.

[0033] In the figure: 101, torque sensor; 102, gyroscope; 103, vehicle speed sensor; 104, rotation speed sensor; 201, processor; 202, memory; 301, mid-mounted motor; 302, electronic transmission. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures has been omitted in the embodiments.

[0035] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0037] It should also be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprises," or any other variations thereof are intended to cover non-exclusive inclusion.

[0038] See also Figure 1-4 The present invention provides a technical solution for a power control method of an electric power-assisted bicycle based on a torque sensor:

[0039] A torque sensor-based power control method for an electric power-assisted bicycle comprises the following steps:

[0040] S1. Obtain vehicle status, human output torque, motor output torque, and electronic transmission gear position information;

[0041] S2, calculating a target motor output torque and a target electronic transmission gear position based on the vehicle state, the human output torque, the motor output torque, and the electronic transmission gear position information;

[0042] S3, controlling the motor transmission and the electronic transmission to shift gears based on the target motor output torque and the target electronic transmission gear.

[0043] The vehicle state includes data such as vehicle speed, vehicle acceleration, and vehicle tilt angle variable. The tilt angle variable and vehicle acceleration are detected by the gyroscope 102 .

[0044] The human output torque is detected by a torque sensor 101 , which is installed at the center axis of the vehicle.

[0045] The vehicle speed is detected by a vehicle speed sensor 103 .

[0046] The gear position of the electronic transmission 302 is detected by a control circuit of the electronic transmission 302 .

[0047] A power control device for a power-assisted bicycle, comprising:

[0048] Memory 202, for storing computer programs;

[0049] The processor 201 is configured to implement the steps of the power control method for an electric power-assisted bicycle when executing a computer program.

[0050] A power-assisted bicycle comprises a power-assisted bicycle body and a power control device of the power-assisted bicycle, wherein the flywheel comprises five gears, 1-5.

[0051] The memory 202 stores the vehicle status, human output torque and electronic transmission gear mid-mounted motor output power adjustment database, such as Figure 2 shown.

[0052] The electronic transmission 302 includes a flywheel and a chain lever, and the flywheel is equipped with a speed sensor.

[0053] The memory 202 stores a vehicle flywheel rotation speed and vehicle gear adjustment database.

[0054] When the electronic transmission 302 needs to shift gears, the speed sensor 104 detects the speed of the flywheel. When the speed meets the shifting requirements, the electronic transmission 302 shifts gears to avoid shifting jams or transmission chain disengagement caused by the flywheel speed being too low.

[0055] The torque sensor 101 , the gyroscope 102 , the vehicle speed sensor 103 , and the rotation speed sensor 104 are all connected to the processor 201 .

[0056] Example 1:

[0057] When the vehicle is started, the vehicle is on a 10° uphill road, and the electronic transmission 302 of the vehicle is in the 3rd gear;

[0058] After the vehicle is started, the mid-mounted motor 301 intervenes, and the gyroscope 102 detects that the vehicle is on a 10° uphill slope. At this time, the power assist ratio of the mid-mounted motor 301 is adjusted to 7:3. Then, the processor 201 sends a shift command to the electronic transmission 302. At the same time, the flywheel speed sensor 104 compares the flywheel speed with the shiftable speed stored in the memory 202. When the flywheel speed reaches the required speed, the electronic transmission 302 executes the shift command, reducing the electronic transmission gear position and completing the automatic shift.

[0059] Example 2:

[0060] The vehicle continues to drive, and the road surface changes from an uphill slope of 10° to an uphill slope of 20°. The gyroscope 102 detects that the vehicle is on a 10° uphill road surface. At this time, the power assist ratio of the mid-mounted motor 301 is adjusted to 8 to 2. Then the processor 201 sends a shift command to the electronic transmission 302. At the same time, the flywheel speed sensor 104 compares the flywheel speed with the shiftable speed in the memory 202. When the flywheel speed reaches the specified value, the electronic transmission 302 executes the shift command to further reduce the gear position.

[0061] The foregoing description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any variation, modification, replacement, integration, or parameter change to these embodiments, which is within the spirit and principles of the present invention and which achieves the same functionality through conventional substitutions, without departing from the principles and spirit of the present invention, falls within the scope of protection of the present invention.

Claims

1. A power control method for an electric power-assisted bicycle based on a torque sensor, characterized in that: The following steps are involved: S1, obtaining vehicle status, human output torque, motor output torque, and electronic transmission gear position information; S2, calculating a target motor output torque and a target electronic transmission gear position based on a vehicle state, a human output torque, a motor output torque, and electronic transmission gear position information; S3, based on the target motor output torque and the target electronic transmission gear position, controlling the motor transmission and the electronic transmission to shift gears up or down.

2. A torque sensor-based power control method for an electric power-assisted bicycle as claimed in claim 1, characterized in that: The vehicle state includes vehicle speed, vehicle acceleration, and vehicle tilt angle variable, and the tilt angle variable and vehicle acceleration are detected by a gyroscope.

3. A torque sensor-based power control method for an electric power-assisted bicycle as claimed in claim 2, characterized in that: The human output torque is detected by a torque sensor, which is installed at the center axis of the vehicle.

4. A torque sensor-based power control method for an electric power-assisted bicycle as claimed in claim 3, characterized in that: The speed of the vehicle is detected by a speed sensor.

5. The power control method of an electric power-assisted bicycle based on a torque sensor as claimed in claim 3, characterized in that: The electronic transmission gear position is detected by a control circuit provided by the electronic transmission.

6. A power control device for a power-assisted bicycle, characterized in that: The device comprises: Memory for storing computer programs; A processor is used to implement the steps of the power control method of the electric power-assisted bicycle as claimed in any one of claims 1 to 6 when executing the computer program.

7. A power-assisted bicycle, characterized in that: The invention comprises a power-assisted bicycle body and also comprises a power control device for the power-assisted bicycle as claimed in claim 6.

8. A power control device for an electric bicycle as claimed in claim 6, characterized in that: The memory stores a database for adjusting the vehicle status, human output torque and the output power of the central motor of the electronic transmission gear.

9. The power-assisted bicycle according to claim 6, characterized in that: The electronic transmission comprises a flywheel and a chain lever, and the flywheel is equipped with a rotation speed sensor.

10. The power control device for an electric bicycle according to claim 6, characterized in that: The memory stores a vehicle flywheel rotation speed and a vehicle gear adjustment database.

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