Regenerative braking method and apparatus for power-assisted bicycle

Abstract

A regenerative braking method and apparatus for a power-assisted bicycle. There are a regenerative braking mode and a normal travel mode during the forward riding of a power-assisted bicycle. In the regenerative braking mode, a signal is sent to a motor (1) by means of a button provided on a handlebar, upon receiving the signal, the motor (1) starts, an electrically controlled clutch (5) is powered on, so that an output end of the motor (1) is connected to wheels, then the motor (1) stops operating, the wheels drive the motor (1) to rotate, the motor (1) generates power, and braking is performed while energy recovery is achieved; and in the normal travel mode, the motor (1) stops or drives the wheels to rotate, the electrically controlled clutch (5) is not powered on, the output shaft of the motor (1) is not connected to the wheels (a coasting state) or the motor (1) drives the wheels to rotate (a power-assisted state), and the power-assisted bicycle travels normally. The apparatus and method enable a rider to select coasting and power-assisted riding or energy recovery, so that the riding process is simple and convenient, and riding comfort is improved.

Description

Energy feedback braking method and device for power-assisted bicycle TECHNICAL FIELD

[0001] The present application relates to an energy feedback braking method and device for power-assisted bicycle, belonging to the technical field of power-assisted bicycle. BACKGROUND

[0002] Power-assisted bicycle is a new type of two-wheeled vehicle, which is a kind of bicycle. It uses battery as auxiliary power source, is equipped with motor and has power-assisted system, and can realize the integration of human-powered riding and motor-assisted riding, making people's riding more comfortable. However, if the battery runs out of power during riding, the power-assisted bicycle will lose the power-assisted effect. Therefore, the industry has developed various energy recovery devices for power-assisted bicycles. For example, a passive power-assisted bicycle based on brake energy conversion is disclosed in Chinese Utility Model Patent No. CN215436788U, which specifically discloses a device including a gearbox, a stepper motor, an assist device and a battery device. The stepper motor, the assist device and the gearbox are connected in sequence, and the gearbox, the stepper motor, the assist device and the battery device are installed on the bicycle frame. The battery device is connected with the stepper motor. However, the stepper motor of this scheme is always connected with the wheel. If the motor is not started, it is more difficult to ride in the normal riding process, and the rider cannot choose whether to assist or not and whether to recover energy according to his own needs. SUMMARY

[0003] The purpose of the present application is to provide an energy feedback braking method and device for power-assisted bicycle. The present application can allow the rider to choose whether to ride normally or to recover energy, simplify the riding process and improve the riding comfort.

[0004] The technical solution of the present application is an energy feedback braking method for power-assisted bicycle. When the power-assisted bicycle is riding forward, it is divided into energy feedback braking mode and normal driving mode.

[0005] When the conversion from normal driving mode to energy feedback braking mode is needed, the button on the handle or the positive and reverse pedal sensor installed on the middle shaft of the bicycle sends a button or pedal reverse rotation signal to the motor driver, and the motor starts to start after receiving the signal. At this time, the power-assisted bicycle is driving, and the wheel has a certain speed. When the speed of the motor matches the speed of the wheel, the electric control clutch is energized, the clutch roller inside the inner ring of the electric control clutch moves towards the outer disc of the electric control clutch, the rotating inner disc of the electric control clutch and the outer disc of the electric control clutch are combined through the electromagnetic clutch roller, so that the output shaft of the motor is connected with the planet carrier of the planetary gear set. At this time, stop or adjust the driving of the motor, and the wheel drives the motor to rotate, so that the motor becomes a power generation state, and the energy recovery and braking are realized by the motor driver.

[0006] In normal driving mode, if the speed control handle returns to zero position and the pedal rotation sensor signal stops, the motor does not run, the electric control clutch is not energized, and the output shaft of the motor is not connected with the wheel. The sun gear of the planetary gear set connected with the output end of the motor is fixed, the outer gear of the planetary gear set is driven to rotate by the wheel, and the planet wheel rotates around the sun gear. At this time, the power-assisted bicycle is in the coasting state during normal riding.

[0007] The above-mentioned energy feedback braking method for power-assisted bicycle, when the power-assisted bicycle needs to exit the energy feedback mode and convert to normal coasting or power-assisted riding during forward movement in the energy feedback mode, the button on the handle or the positive and reverse pedal sensor installed on the middle shaft of the bicycle sends a button or pedal positive rotation signal to the motor driver, and the motor starts to convert from the feedback braking mode to the coasting or power-assisted riding mode after receiving the signal. The electric control clutch is in a power-off state, at this time, the electromagnetic clutch roller in the inner ring of the electric control clutch is separated from the outer disc of the electric control clutch, and the separation of the outer disc and the rotating inner disc of the electric control clutch is realized. When the speed of the motor is higher than the corresponding speed of the wheel, the motor drives the wheel through the original one-way mechanical clutch inside the hub motor to realize the effect of coasting or power assistance.

[0008] The device for realizing the above-mentioned energy feedback braking method for power-assisted bicycle includes a motor, a planetary gear set arranged in front of the motor, and a sun gear of the planetary gear set fixedly connected with the output shaft of the motor. The front part of the planetary gear set is provided with a mechanical clutch, and the front part of the mechanical clutch is provided with an electric control clutch. The output shaft of the motor is fixedly connected with a connecting shaft, and the sun gear of the planetary gear set is located outside the connecting shaft and is fixedly connected.

[0009] The device, the mechanical clutch includes the outer disc, the inner disc is rotatably connected in the outer disc, the outer disc is equipped with the notch at the edge of the inner disc, the inner end of the notch is connected with the first spring, the other end of the first spring is connected with the clutch roller, the outer disc is fixedly connected with the planet carrier of the planetary gear set, and the inner disc is fixedly connected with the connecting shaft.

[0010] The device, the planet carrier of the planetary gear set is equipped with a plurality of connecting columns, and the outer disc is connected with the planet carrier of the planetary gear set through the connecting columns.

[0011] The device, the electric control clutch includes the electric control clutch outer disc, the rotating inner disc is rotatably connected in the middle of the electric control clutch outer disc, the rotating inner disc is equipped with a moving groove, and the moving groove is exposed from the side of the rotating inner disc; the electromagnetic clutch roller is slidably connected in the moving groove; the rotating inner disc is equipped with an electromagnet, the electromagnet is connected with an L-shaped rod, the other end of the L-shaped rod is connected with the electromagnetic clutch roller; the electric control clutch outer disc is fixedly connected with the planet carrier of the planetary gear set; the rotating inner disc is fixedly connected with the connecting shaft; and the middle of the L-shaped rod is rotatably connected with the rotating inner disc.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] 1、The present application includes energy feedback braking mode and normal driving mode in normal riding process, in the energy feedback braking mode, the wheel has a certain speed because it has been driving, if the motor suddenly intervenes in the static state, a strong jerk feeling will be produced, which may cause the vehicle to fall and trigger a safety accident, so the motor needs to be started first, when the speed of the motor matches the speed of the wheel, the electric control clutch connects the output end of the motor with the wheel, then the motor stops running, the wheel drives the motor to rotate, the motor generates electricity, realizing energy recovery and braking at the same time; in the normal driving mode, the motor does not run, the electric control clutch is not powered, and the assist bicycle drives normally (coasts or assists riding). Therefore, the rider can choose whether to recover energy according to needs, which simplifies the riding process and improves the riding comfort.

[0014] 2、When the rider needs assistance, the electric control clutch is powered off, the motor drives the wheel to rotate through the mechanical one-way clutch and the planetary gear, realizing the effect of assistance.

[0015] 3、The electric control clutch of the present application is powered to make the one end of the L-shaped rod close to the electromagnet rotate towards the electromagnet, the other end drives the electromagnetic clutch roller to move along the moving groove towards the outside of the rotating inner disc, until the outside of the electromagnetic clutch roller contacts the electric control clutch outer disc, so that the electric control clutch outer disc and the rotating inner disc are combined. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a structural schematic view of the present application.

[0017] Figure 2 is a schematic diagram of the explosion of the present application;

[0018] Figure 3 is a schematic diagram of the internal structure of the electrically controlled clutch. DETAILED DESCRIPTION

[0019] The present application will be further described below in conjunction with the accompanying drawings and examples, but not as the basis for limiting the present application. Example 1

[0020] An energy feedback braking method for a power-assisted bicycle, the specific steps are as follows: when the power-assisted bicycle is riding forward, it is divided into an energy feedback braking mode and a normal driving mode;

[0021] When it is needed to convert from the normal driving mode to the energy feedback braking mode, a button provided on the handle or a reverse pedal sensor installed on the bicycle axle sends a button or pedal reverse signal to the motor 1 driver, and the motor 1 starts to start after receiving the signal. At this time, the power-assisted bicycle is driving, and the wheel has a certain speed. When the speed of the motor 1 matches the speed of the wheel, the electrically controlled clutch 5 is energized, driving the clutch roller inside the inner ring to move towards the electrically controlled clutch outer disc 12, so that the rotating inner disc 13 of the electrically controlled clutch 5 and the electrically controlled clutch outer disc 12 are combined through the electromagnetic clutch roller 17, thereby connecting the output shaft of the motor 1 with the planet carrier of the planetary gear set 2. At this time, stop or adjust the driving of the motor 1, and the wheel drives the motor 1 to rotate, so that the motor 1 is converted to a generating state, and the energy recovery and braking are realized by the motor 1 driver;

[0022] In the normal driving mode, if the speed control handle returns to the zero position and the pedal rotation sensor signal stops, the motor 1 does not run, the electrically controlled clutch 5 is not energized, and the output shaft of the motor 1 is not connected with the wheel. The sun gear of the planetary gear set 2 connected with the output end of the motor 1 is fixed, the outer gear ring of the planetary gear set 2 is driven to rotate by the wheel, and the planetary gear set 2 is driven to rotate around the sun gear by the outer gear ring. At this time, the power-assisted bicycle is in a normal coasting state.

[0023] When the power-assisted bicycle is running forward in the energy feedback mode, and needs to exit the energy feedback mode and turn to normal coasting or power-assisted riding, a button provided on the handle or a forward rotation sensor installed on the middle shaft of the bicycle sends a button or pedal forward rotation signal to the motor 1 driver, and the motor 1 starts to switch from the feedback braking mode to the normal coasting or power-assisted riding mode after receiving the signal, and the electric control clutch 5 turns to the power-off state, at which time the electromagnetic clutch roller 17 in the inner ring of the electric control clutch 5 is separated from the electric control clutch outer disc 12, and the electric control clutch outer disc 12 and the rotating inner disc 13 are separated. When the motor 1 rotates at a speed higher than the corresponding speed of the wheel, the motor 1 drives the wheel through the original one-way mechanical clutch 4 inside the hub motor, achieving the effect of assistance.

[0024] When the power-assisted bicycle slips on an uphill, the motor 1 does not work, so that the sun gear is stationary, and the wheel reverses to drive the outer ring gear of the planetary gear set 2 to rotate, the planetary gear drives the outer disc 7 of the mechanical clutch 4 to rotate, so that the clutch roller 11 in the slot 9 on the outer disc 7 contacts the inner disc 8 to generate friction, and the outer disc 7 and the inner disc 8 are gradually locked, the inner disc 8 is fixedly connected with the sun gear, and then the planetary gear and the sun gear are locked, so that the outer ring gear cannot rotate, achieving the effect of anti-slipping braking. Embodiment 2

[0025] As shown in FIGS. 1-3, the present embodiment provides a device for implementing the method of embodiment 1, which comprises a motor 1, the front part of the motor 1 is provided with a planetary gear set 2, and the output shaft of the motor 1 is fixedly connected with the sun gear of the planetary gear set 2; the front part of the planetary gear set 2 is provided with a mechanical clutch 4, and the front part of the mechanical clutch 4 is provided with an electric control clutch 5; the output shaft of the motor 1 is fixedly connected with a connecting shaft 6, and the sun gear of the planetary gear set 2 is located outside the connecting shaft 6. The mechanical clutch 4 and the electric control clutch 5 are respectively fixedly connected with the wheel. The mechanical clutch 4 comprises an outer disc 7, and the outer disc 7 is rotatably connected with an inner disc 8; the outer disc 7 is provided with a slot 9 located at the edge of the inner disc 8, the inner end of the slot 9 is connected with a first spring 10, the other end of the first spring 10 is connected with a clutch roller 11; the outer disc 7 is fixedly connected with the planet carrier of the planetary gear set 2; the inner disc 8 is fixedly connected with the connecting shaft 6, and the mechanical clutch 4 will extrude the clutch roller 11 into the slot 9 during normal tire driving, and the first spring 10 is used for resetting the clutch roller 11.

[0026] As shown in FIG. 2, a plurality of connecting columns 16 are provided on the planet carrier of the planetary gear set 2, and the outer disc 7 is connected with the planet carrier of the planetary gear set 2 through the connecting columns 16.

[0027] As shown in Figure 3, the electric control clutch 5 comprises an electric control clutch outer disc 12, a rotating inner disc 13 is rotatably connected to the middle part of the electric control clutch outer disc 12, a moving groove 14 is arranged on the outer edge of the rotating inner disc 13, the moving groove 14 is exposed from the side of the rotating inner disc 13, and the opening of the moving groove 14 is tightly attached to the inner side wall of the electric control clutch outer disc 12; an electromagnetic clutch roller 17 is slidably connected in the moving groove 14; an electromagnet 15 is arranged on the rotating inner disc 13, the electromagnet 15 is connected with an L-shaped rod 18, the other end of the L-shaped rod 18 is connected with the electromagnetic clutch roller 17; the electric control clutch outer disc 12 is fixedly connected with the planet carrier of the planetary gear set 2; the rotating inner disc 13 is fixedly connected with the connecting shaft 6; the middle part of the L-shaped rod 18 is rotatably connected with the rotating inner disc 13.

[0028] In summary, the present application can let the rider choose to slide and perform power-assisted cycling or energy recovery, which simplifies the cycling process and improves the cycling comfort. In addition, the present application can also prevent the power-assisted bicycle from sliding.

Claims

1. An energy feedback braking method for a power-assisted bicycle, characterized in that: The power-assisted bicycle has two operation modes: energy feedback braking mode and normal driving mode; the energy feedback braking mode is that the power-assisted bicycle recovers kinetic energy through motor braking, and the normal driving mode is that the power-assisted bicycle is driven by the motor or slides; When it is needed to switch from the normal driving mode to the energy feedback braking mode, a button arranged on a handle or a forward-reverse pedal sensor installed on a middle shaft of the bicycle sends a reverse signal to a motor driver, and the motor starts to operate after receiving the signal; when the rotating speed of the motor matches the rotating speed of the wheel of the power-assisted bicycle, an electrically-controlled clutch is powered on, the electromagnetic clutch roller inside the inner ring of the electrically-controlled clutch moves towards the outer disc of the electrically-controlled clutch, the rotating inner disc of the electrically-controlled clutch and the outer disc of the electrically-controlled clutch are combined through the electromagnetic clutch roller, so that the output shaft of the motor is connected with the planet carrier of the planetary gear set; at this time, the driving of the motor is stopped or adjusted, the wheel drives the motor to rotate through the electrically-controlled clutch, the motor is switched to the power generation state, and the energy recovery and braking are realized by the motor driver; In the normal driving mode, when the speed control handle returns to the zero position and the pedal rotation sensor signal stops, the motor stops operating, the electrically-controlled clutch remains in the power-off state, the output shaft of the motor is not connected with the wheel, the sun gear of the planetary gear set is fixed, the outer gear ring of the planetary gear set is rotated by the wheel and drives the planet wheel to rotate around the sun gear, and the power-assisted bicycle is in the normal sliding state.

2. The energy feedback braking method for a power-assisted bicycle according to claim 1, characterized in that: When the power-assisted bicycle needs to exit the energy feedback mode and be switched to the normal sliding or power-assisted riding, the following steps are taken to exit the energy feedback mode: A button arranged on a handle or a forward-reverse pedal sensor installed on a middle shaft of the bicycle sends a forward signal to a motor driver, and the motor starts mode switching after receiving the signal; The electrically-controlled clutch is switched to the power-off state, the electromagnetic clutch roller in the inner ring of the electrically-controlled clutch is separated from the outer disc of the electrically-controlled clutch, the outer disc of the electrically-controlled clutch is separated from the rotating inner disc, and when the rotating speed of the motor is higher than the corresponding rotating speed of the wheel, the motor drives the wheel through the one-way mechanical clutch inside the hub motor, and power assistance is realized.

3. Device for implementing the energy feedback braking method for a power-assisted bicycle according to claim 1 or 2, characterised in that: The motor (1) is provided with a planetary gear set (2) in front of the motor (1), the output shaft of the motor (1) is fixedly connected with the sun gear of the planetary gear set (2); the front part of the planetary gear set (2) is provided with a mechanical clutch (4), the front part of the mechanical clutch (4) is provided with an electrically-controlled clutch (5); the output shaft of the motor (1) is fixedly connected with a connecting shaft (6), and the sun gear of the planetary gear set (2) is located outside the connecting shaft (6) and is fixedly connected.

4. The apparatus of claim 3, wherein: The mechanical clutch (4) comprises an outer disc (7) and an inner disc (8) which is rotatably connected inside the outer disc (7); the outer disc (7) is provided with a notch (9) at the edge of the inner disc (8), the inner end of the notch (9) is connected with a first spring (10), the other end of the first spring (10) is connected with a clutch roller (11); the outer disc (7) is fixedly connected with the planet carrier of the planetary gear set (2); and the inner disc (8) is fixedly connected with the connecting shaft (6).

5. The apparatus of claim 4, wherein: A plurality of connecting columns (16) are arranged on the planet carrier of the planetary gear set (2), and the outer disc (7) is connected with the planet carrier of the planetary gear set (2) through the connecting columns (16).

6. The apparatus of claim 3, wherein: The electric control clutch (5) comprises an electric control clutch outer disc (12), a rotating inner disc (13) rotatably connected to the middle part of the electric control clutch outer disc (12), a moving groove (14) arranged on the rotating inner disc (13) and exposed outside from the side part of the rotating inner disc (13), an electromagnetic clutch roller (17) slidably connected in the moving groove (14), an electromagnet (15) arranged on the rotating inner disc (13), an L-shaped rod (18) connected to the electromagnet (15), and the other end of the L-shaped rod (18) connected with the electromagnetic clutch roller (17); the electric control clutch outer disc (12) is fixedly connected with the planet carrier of the planetary gear set (2); the rotating inner disc (13) is fixedly connected with the connecting shaft (6); and the middle part of the L-shaped rod (18) is rotatably connected with the rotating inner disc (13).

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