CN201074018Y - Power assisting system of electric power-assisted bicycle - Google Patents

Abstract

A power assist system for an electric power assisted bicycle, comprising: a pedal transmission mechanism is driven by the pedal to drive a driven wheel set to rotate; a pedaling force sensing set for measuring the pedaling force of the pedaling transmission mechanism; a battery; a motor for receiving the electric power of the battery and supplying driving assistance to the driven wheel set; and a main controller having a microprocessor for receiving the pedal force sensing signal of the pedal force sensing set and controlling the magnitude of the driving assistance output by the motor according to an assistance ratio, an assistance module for setting the assistance ratio of the microprocessor, and a display module for displaying the assistance ratio mode, the driving speed and the mileage; therefore, the utility model discloses but display system's helping hand is compared the mode and is supplied the user to refer to, and it is more convenient to let the user control, and can avoid the too big drive helping hand of motor output, and then ensures the security in the use.

Description

Power assist system of electric assist bicycle

technical field

The utility model relates to an electric power assist bicycle, in particular to a power assist system of the electric power assist bicycle.

Background technique

By the way, under the influence of rising oil prices, energy-saving vehicles have become the focus of the public. Among them, electric-powered electric bicycles have the advantages of no pollution and low energy consumption. Therefore, in recent years, electric bicycles, regardless of It is used for fitness, leisure or short-distance transportation, and it has become increasingly popular in the market.

In order to make their own products have a more competitive advantage, in addition to reducing the total weight of the vehicle and reducing the manufacturing cost, how to make the electric bicycle more suitable for the design of human factors, so as to attract more buyers, is also One of the directions that the industry is eager to improve.

As disclosed in Taiwan Patent No. I244453, a "smart electric bicycle" includes a battery for power supply, a motor for driving power, a brake sensor, a speed control handle for controlling the motor, a vehicle speed sensor, and a pedal speed sensor. The central processing unit receives the signals of each sensor, and then makes a judgment, and automatically switches the power supplied by the motor to a fixed man-machine assist ratio, a controllable man-machine assist ratio and a controllable all-electric driving Three intelligent driving modes.

However, the driving power of the electric bicycle is completely controlled by the speed control handle, and the driving mode is automatically judged by the central processing device, that is, when the electric bicycle is advancing, the user cannot know the driving mode at that time, then when riding In the terrain that requires a large boost, the user tends to turn the speed control handle excessively due to personal judgment, causing the motor to output too much driving power, which relatively affects the safety of riding and the stability of the structure; therefore, the known technology is still There is room for improvement.

Utility model content

The purpose of the utility model is to provide a power assist system of an electric power assist bicycle to overcome the defects in the known technology.

In order to achieve the above purpose, the power assist system of the electric power assist bicycle provided by the utility model includes:

A pedal transmission mechanism has a pedal handle shaft, which is driven by the pedal to rotate. A driving wheel set is combined with the pedal handle shaft and rotates coaxially. The driving wheel set is driven by a chain to rotate a driven wheel set. ;

A pedaling force sensing group, which has a gear velocimeter set on the driving wheel set, and a torque sensor set on the driven wheel set to measure the pedaling force of the pedal transmission mechanism;

a battery;

a motor, receiving power from the battery, and supplying driving assistance to the driven wheel set; and

A main controller has a microprocessor, receives the pedal force sensing signal of the pedal force sensing group, and controls the driving power output of the motor according to a power assist ratio, and a power boost module sets the power boost of the microprocessor ratio, a display module displays the assist ratio mode, driving speed and mileage.

The power assist system of the electric assist bicycle also includes a secondary controller, which is controlled by the microprocessor of the main controller, and then controls the electric power provided by the battery to the motor.

In the power assist system of the electric power assist bicycle, the main controller also has a lighting switch, which turns on or off the backlight light source of the display module.

In the power assist system of the electric assist bicycle, the motor is further provided with a speed sensor, which transmits the speed signal of the motor to the microprocessor of the main controller.

In the power assist system of the electric assist bicycle, a battery gauge is provided in the battery, which detects the power of the battery and connects it to the main controller, and displays the power on the display module.

The power assist system installed on the electric power assist bicycle provided by the utility model can display various parameters of the system, making it more convenient for the user to control the power assist of the bicycle, and can set a power assist ratio that meets personal needs, thereby avoiding excessive output of the motor. Large driving boost to ensure safety in use.

Description of drawings

Fig. 1 is a schematic diagram of the appearance of a preferred embodiment of the utility model, showing the structure of the bicycle.

Fig. 2 is generally the same as Fig. 1, showing the circuit connection relationship among the various components.

Fig. 3 is a partially enlarged view of a preferred embodiment of the present invention.

Fig. 4 is an electrical control diagram of a preferred embodiment of the utility model.

Explanation of main component symbols in the attached drawings:

Body 10

rider frame 11

Front fork 12

middle tube 13

rear fork 14

shelf 15

Pedal transmission mechanism 20

pedal handle 22

Pedal shaft 24

Drive wheel set 26

chain 27

driven wheel set 28

Pedal Force Sensing Group 30

Gear tachometer 32

Torque sensor 34

battery 40

Motor 50

Master controller 60

Power module 62

Display module 64

Light switch 66

Sub-controller 70

Detailed ways

The power assist system of the electric power assist bicycle of the present utility model includes: a pedal transmission mechanism, which has a pedal handle shaft, which is driven by the pedal to rotate, and a driving wheel group is compounded on the pedal handle shaft, and rotates coaxially. The driving wheel set is driven by a chain to rotate a driven wheel set; a pedaling force sensing set has a gear velocimeter set on the driving wheel set and a torque sensor on the driven wheel set to measure the foot The pedaling force of the pedal transmission mechanism; a battery; a motor, receiving the power of the battery, and supplying driving assistance to the driven wheel set; and a main controller, having a microprocessor, receiving the foot force of the pedaling force sensing group pedaling force sensing signal, and control the driving power output of the motor according to a power ratio, a power boost module sets the power boost ratio of the microprocessor, and a display module displays the power boost ratio mode, driving speed and mileage; thus , the utility model can display the power ratio mode of the system for the user's reference, which makes the user's control more convenient, and can avoid the motor from outputting too much driving power, thereby ensuring the safety of use.

In order to better understand the features and effects of the present utility model, the following examples are given and explained as follows in conjunction with the accompanying drawings:

Fig. 1 is a schematic diagram of the appearance of a preferred embodiment of the utility model, showing the structure of the bicycle.

Fig. 2 is generally the same as Fig. 1, showing the circuit connection relationship among the various components.

Fig. 3 is a partially enlarged view of a preferred embodiment of the present invention.

Fig. 4 is an electrical control diagram of a preferred embodiment of the utility model.

First of all, please refer to Fig. 1 to Fig. 3, the power assist system of the electric power assist bicycle of the present invention is installed on the body 10 of a bicycle, the body 10 includes a rider frame 11, a front fork frame 12, a middle tube 13. A rear fork frame 14 and a shelf 15, and the booster system includes a pedal transmission mechanism 20, a pedal force sensing group 30, a battery 40, a motor 50, a main controller 60 and a sub-controller 70.

The pedal transmission mechanism 20 is mounted on the bottom of the car body 10, and it has two pedal handles 22 for the user to step on, and the two pedal handles 22 are jointly connected to a pedal handle shaft 24, and the pedal handle shaft 24 is combined with the center of the pedal. Drive wheel set 26, then drive wheel set 26 is connected with a driven wheel set 28 by a chain 27; With this, when the user steps on, pedal handle shaft 24 bears pedaling force and rotates, then by drive wheel set 26, chain 27 and the driven wheel set 28 transmit power to allow the bicycle to move forward; wherein, the drive wheel set 26 and the driven wheel set 28 are multi-layer transmission chainrings in this embodiment, and of course they can all be single-layer chainrings .

The pedaling force sensing group 30 has a gear velocimeter 32 and a torque sensor 34, the gear velocimeter 32 is arranged on the drive wheel set 26 of the pedal transmission mechanism 20, and it can detect the rotating speed of the drive wheel set 26, and the torque sensor 34 is installed It is arranged on the rear fork frame 14 to detect the change of the moment by the principle of magnetic sensing.

The battery 40 is installed at the bottom of the shelf 15 of the car body 10, and a battery gauge (not shown) is provided inside it, which can detect the storage capacity of the battery 40, and can accurately calculate the charge or discharge of the battery 40, so that the battery 40 can efficiently provide power to the motor 50 .

The motor 50 is installed on the rear fork frame 14, and it is provided with a mandrel (not shown), connected to the torque sensor 34 of the pedal force sensing group 30, and coaxially compounded on the driven wheel group 28, so when the motor 50 The motor 50 is provided with a speed sensor (not shown) inside the motor 50 to detect the rotation speed of the motor 50 .

The main controller 60 and the sub-controller 70 are respectively installed on the rider frame 11 and the center tube 13. A microprocessor (not shown) is installed inside the main controller 60 to receive the pedal force sensing group 30, the battery gauge of the battery 40 and the motor. The signal measured by the speed sensor 50 is connected to the sub-controller 70, and the sub-controller 70 is electrically connected to the battery 40 and the motor 50, and the power conversion of direct current to direct current (DC-DC) can be performed inside it, so it can The electric power supplied by the battery 40 to the motor 50 is controlled, thereby controlling the rotation speed of the motor 50 .

In addition, the main controller 60 is provided with a booster module 62, a display module 64, and a light switch 66. The booster module 62 allows the user to select a booster ratio mode and transmit it to the microprocessor. The ratio of pedal force and the power assist output by the motor 50; and the display module 64 is a liquid crystal panel module (LCD) in this embodiment, which can receive signals from the microprocessor to display the power assist ratio mode, the power state of the battery 40, and the speed of the bicycle and the mileage, and the backlight light source of the display module 64 is turned on or off by the light switch 66 .

By above-mentioned member, explain principle of the present utility model and operation as follows:

First, please refer to FIG. 4 , the moment sensor 34 of the pedaling force sensing group 30 is directly in contact with the mandrel of the motor 50, that is, it is in contact with the mandrel of the driven wheel 28, and when the pedal transmission mechanism 20 transmits the pedal force, the torque The sensor 34 will sense the slight deformation of the mandrel due to the force through the magnetic sensing, and then send this signal to the microprocessor of the main controller 60, then after the microprocessor integrates the signals of the gear speedometer 32 and the torque sensor 34, Just can determine the size of pedaling force, then the microprocessor can control the electric power transferred to the motor 50 by the sub-controller 70 according to the assist ratio mode set by the assist module 62, and the electric power measured by the speed sensor of the motor 50 The rotational speed is used for feedback comparison, so that the driving power outputted by the motor 50 conforms to the setting of the power boosting module 62 .

Among them, the booster module 62 can limit the booster ratio according to the speed of the bicycle. When the speed is 0-15km/h, the booster ratio is not limited, that is, the user can set the booster ratio to be 1:1 or 1:2 or more. To obtain greater driving assistance; and when the vehicle speed is 15-24km per hour, the microprocessor will gradually decrease the driving assistance until the speed is 25km per hour, the power assist system will not provide driving assistance at all; in addition, the microprocessor and The assist module 62 switches the assist ratio mode to the work/sleep mode, that is, when the pedal force sensing group 30 does not measure the pedal force, or when the vehicle speed is 25 km/h, the assist ratio mode will automatically switch to the sleep mode, and the rest will be in the work mode. And the assist ratio mode and ratio are displayed on the display module 64; thus, the motor 50 can be protected from outputting excessive driving assist, and the user can set the required assist ratio according to the terrain.

Summing up the above description, it can be known that when the utility model is applied to an electric power-assisted bicycle, various parameters of the system can be displayed on the display module 64 by the microprocessor of the main controller 60, making it more convenient for the user to control the power-assisted bicycle. And after setting the assist ratio, the main controller 60 can control the drive assist output of the motor 50 more precisely according to the feedback control of the signal, and then switch to the sleep/work mode, so that the system does not output drive assist when the user is not pedaling , and prevent the motor 50 from outputting too much driving power to ensure safety in use.

Claims (5)

1. the force aid system of an electric booster bicycle is characterized in that, includes:

One foot is stepped on transmission device, has the arbor of stepping on, and is subjected to sufficient stepping on to drive and rotate, and driving wheels are compound in this and step on arbor, and the rotation of coaxial heart, and these driving wheels are driven wheels by a chain and rotate;

One legpower sensing group has a gear velometer, is located at this driving wheels, is located at this with a torque sensor and is driven wheels, records the sufficient legpower that this foot is stepped on transmission device;

One battery;

One motor receives the electric power of this battery, and supply drives power-assisted and driven wheels in this; And

One primary controller, has a micro controller system, receive the sufficient legpower sensing signal of this legpower sensing group, and recently control the driving power-assisted size of this motor output according to a power-assisted, one power-assisted module is set the power-assisted ratio of this micro controller system, and a display module shows that this power-assisted is than pattern, road speed and mileage number.

2. according to the force aid system of the described electric booster bicycle of claim 1, it is characterized in that wherein also include a joystick controller, it is controlled by the micro controller system of this primary controller, and then controls the electric power that this battery offers this motor.

3. according to the force aid system of the described electric booster bicycle of claim 1, it is characterized in that wherein this primary controller also has a lighting switch, open or close the back light of this display module.

4. according to the force aid system of the described electric booster bicycle of claim 1, it is characterized in that wherein this motor also is provided with a speed sensor, the speed signal that transmits this motor is given the micro controller system of this primary controller.

5. according to the force aid system of the described electric booster bicycle of claim 1, it is characterized in that, wherein also be provided with a battery gauge in this battery, detect the electric weight of this battery and be connected in this primary controller, and electric weight is shown in this display module.

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