Chain-free transmission assisting system of E-Bike

Abstract

The invention discloses an E-Bike chain-free power assisting system which comprises a power assisting bicycle. The power-assisted bicycle comprises a generator, a generator controller, pedals, a motor, a motor controller and a battery. The pedals are in transmission connection with a rotor of the generator through a crank, and the generator and the battery are installed on the power-assisted bicycle. The motor is in driving connection with a rear wheel of the power-assisted bicycle; when the pedals are treaded, the generator generates electricity, and the motor drives the power-assisted bicycle to advance; when the pedals are not treaded, the motor stops driving the power-assisted bicycle to advance until the motor stops driving the power-assisted bicycle; the motor controller is used for adjusting the speed of the power-assisted bicycle according to the change of the pedaling frequency and pedaling force of the pedals collected by the generator controller; a rider can start the bicycle more easily and has more comfortable pedaling frequency at a high speed; when the electric quantity of the battery is low, the output power of the generator is increased by increasing magnetic resistance, so that the long endurance of the power-assisted bicycle is realized; and the comfort is ensured while long endurance is considered.

Description

Technical Field

[0001] The invention relates to the field of bicycles, and in particular to a chainless transmission power-assisting system of an E-Bike. Background Art

[0002] The rapid expansion of the E-Bike market and the increasing demand of consumers for environmentally friendly and convenient travel methods; the rapid growth of the E-Bike market has also attracted many companies to enter this field. For example, the electric power system DJI Avinox launched by drone giant DJI stands out in the global mid-to-high-end E-Bike market with its lightweight and powerful features, showing the importance of technological innovation and product strength. Whether it is a front-wheel drive, mid-mounted, rear-wheel drive or dual-drive motor system, the power composition of traditional ebikes is human power through pedaling, and then through mechanical parts such as cranks, middle shafts, toothed discs, chains, etc., connected to the rear flywheel, transmission, and rear wheel hub to drive the entire vehicle to move. The maintenance cost is high, and the speed change system of high-end brands is expensive. This system can simulate the gear speed change effect and realize the function of replacing the transmission. At the same time, chain transmission has a higher failure rate, mechanical wear is faster, and chain oil can easily stain clothes and ruin the mood; cruising range may be the most important parameter that most ebike users pay attention to when buying a car. Low mileage will make users anxious. Some ebikes increase cruising range by adding batteries, but the increase in ebike weight will seriously affect the user's riding comfort. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a chainless transmission power-assisting system for an E-Bike, which achieves a long battery life of the power-assisted bicycle by setting a constant torque and constant pedaling frequency shifting mode and a simulated chain transmission mode, and increasing the output power of the generator by increasing the magnetic resistance when the battery is low on power; while taking into account the long battery life, the riding comfort of the rider is ensured, allowing the rider to have an easier start and a more comfortable pedaling frequency at high speeds.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides an E-Bike chainless transmission power-assisting system, comprising a power-assisting bicycle; the power-assisting bicycle comprises a generator, a generator controller, pedals, an electric motor and a motor controller; the pedals are connected to the rotor of the generator through a crank transmission, and the generator and a battery are installed on the power-assisting bicycle; the electric motor drives the rear wheel connected to the power-assisting bicycle;

[0005] When the pedals are pedaled, the generator generates electricity, and the motor controller controls the motor to drive the rear wheel of the power-assisted bicycle to rotate, so that the power-assisted bicycle moves forward; when the pedals are not pedaled, the generator does not generate electricity, and the motor controller controls the motor to stop driving the rear wheel of the power-assisted bicycle to rotate, so that the power-assisted bicycle gradually slows down to a stop; the motor controller adjusts the speed of the power-assisted bicycle according to the changes in the pedaling frequency and pedaling force collected by the generator controller.

[0006] Furthermore, the generator has a magnetic resistance to the pedals, and the generator controller adjusts the magnitude of the magnetic resistance; the power-assisted bicycle includes a constant torque and constant pedaling frequency shifting mode and a simulated chain transmission mode; when the power-assisted bicycle enters the constant torque and constant pedaling frequency shifting mode, the generator controller adjusts the magnetic resistance of the generator to the pedals to remain unchanged; when the power-assisted bicycle enters the simulated chain transmission mode, the generator controller adjusts the magnetic resistance of the generator to the pedals to change with the speed of the power-assisted bicycle.

[0007] Furthermore, when the power-assisted bicycle enters the constant torque constant pedaling frequency shifting mode, the riding pedaling frequency range rpmA to rpmB is set, and the actual pedaling frequency of the pedals is detected by the generator controller and transmitted to the motor controller (8); when the power-assisted bicycle is in the process of running, and the gear position is AutoN; when the detected actual pedaling frequency is greater than rpmB, and the pedals maintain the actual pedaling frequency for two turns or more, the gear position AutoN is increased to AutoN+1; when the detected actual pedaling frequency is less than rpmA, and the pedals maintain the actual pedaling frequency for 3 seconds or more, the gear position AutoN is reduced to AutoN-1.

[0008] Furthermore, when the power-assisted bicycle enters the simulated chain transmission mode, the power-assisted bicycle is in the process of running; when the speed of the power-assisted bicycle increases, the generator controller increases the magnetic resistance of the generator to the pedals; when the speed of the power-assisted bicycle decreases, the generator controller reduces the magnetic resistance of the generator to the pedals.

[0009] Furthermore, the magnetic resistance sequence F is set according to different speeds of the power-assisted bicycle. 阻 : F 阻1 、F 阻2 ,…,F 阻n ; The magnetic resistance sequence F 阻 The corresponding vehicle speed sequence V: V1, V2, ..., V n , the corresponding set cadence sequence rpm 设 :rpm1, rpm2, ..., rpm n , the corresponding output power sequence of the set generator is P 发 :P 发1 , P 发2 ,…P 发n ;

[0010] When the speed of the power-assisted bicycle is V1, the magnetic resistance is F 阻1 ; When the pedal power P 实 Greater than magnetic resistance F 阻1 Corresponding to the output power P of the generator 发1 , and the actual pedaling frequency rpm 实 is greater than the set pedaling frequency rpm1, the speed of the power-assisted bicycle increases from speed V1 to speed V2, and the magnetic resistance increases from F 阻1 Raised to F 阻2 ; If both conditions cannot be met at the same time, the speed of the power-assisted bicycle will be maintained at speed V1;

[0011] When the speed of the power-assisted bicycle is V2, the magnetic resistance is F 阻2 ; When the pedal power P 实 Greater than magnetic resistance F 阻2 Corresponding to the output power P of the generator 发2 , and the actual pedaling frequency rpm 实 is greater than the set pedaling frequency rpm2, the speed of the power-assisted bicycle increases from speed V2 to speed V3, and the magnetic resistance increases from F 阻2 Raised to F 阻3 ; If the two conditions cannot be met at the same time, the speed of the power-assisted bicycle returns from speed V2 to speed V1;

[0012] When the speed of the power-assisted bicycle is V3, the magnetic resistance is F 阻3 ; When the pedal power P 实 Greater than magnetic resistance F 阻3 Corresponding to the output power P of the generator 发3 , and the actual pedaling frequency rpm 实 is greater than the set pedaling frequency rpm3, the speed of the power-assisted bicycle increases from speed V3 to speed V4, and the magnetic resistance increases from F 阻3 Raised to F 阻4 ; If the two conditions cannot be met at the same time, the speed of the power-assisted bicycle returns from speed V3 to speed V2;

[0013] By analogy, the speed of the power-assisted bicycle during its travel is V n-1 When the magnetic resistance is F 阻n-1 ; When the pedal power P 实 Greater than magnetic resistance F 阻n-1 Corresponding to the output power P of the generator 发n-1 , and the actual pedaling frequency rpm 实 Greater than the set cadence rpm n-1 , the speed of the power-assisted bicycle is determined by the speed V n-1 Increase to speed V n , the magnetic resistance is given by F 阻n-1 Raised to F 阻n; If both cannot be satisfied at the same time, the speed of the power-assisted bicycle is determined by the speed V n-1 Return speed V n-2 .

[0014] Furthermore, the power-assisted bicycle includes a crank maintenance mode; when it is detected that the speed of the power-assisted bicycle is zero, the power-assisted bicycle enters the crank maintenance mode, and the generator controller controls the generator to increase the magnetic resistance of the pedals to a maximum; when it is detected that the speed of the power-assisted bicycle is not zero, the power-assisted bicycle exits the crank maintenance mode, and the magnetic resistance is restored to the magnetic resistance before the power-assisted bicycle 1 enters the crank maintenance mode.

[0015] Furthermore, when it is detected that the motor reaches the condition for triggering the stall protection, the magnetic resistance is increased to make the power-assisted bicycle enter the crank maintenance mode; the motor stall includes slow stall and sudden stall.

[0016] Furthermore, when the stall of the motor is a slow stall, the following steps are included:

[0017] S1, check whether the motor outputs full power and maintains it for a certain period of time, otherwise the magnetic resistance remains unchanged, if so, proceed to the next step;

[0018] S2, detecting whether the rotation speed of the motor is lower than or equal to the first rotation speed, otherwise the magnetic resistance remains unchanged, if yes, the magnetic resistance is increased linearly, and the next step is executed;

[0019] S3, detecting whether the rotation speed of the motor is lower than or equal to the second rotation speed, if not, continuing to increase the magnetic resistance linearly, and if so, the motor enters a stall mode until the speed of the power-assisted bicycle is reduced to zero;

[0020] The first rotation speed is greater than the second rotation speed.

[0021] Beneficial effects: The chainless transmission power-assisting system of an E-Bike of the present invention is provided with a constant torque constant pedaling frequency shifting mode and a simulated chain transmission mode; in the constant torque constant pedaling frequency shifting mode, low-speed and high-speed riding effects can be achieved within the same pedaling frequency range, ensuring the riding comfort of the rider; in the simulated chain transmission mode, as the vehicle speed increases, the magnetic resistance also increases, allowing the rider to start more easily and have a more comfortable pedaling frequency at high speeds; a battery is provided, and the magnetic resistance is increased when the battery is low, so as to increase the output power of the generator to achieve long battery life, while taking into account comfort while having long battery life; the chainless transmission power-assisting system has an inherent advantage in automatic gear shifting, because its chainless design can get rid of the constraints of mechanical power ratio and speed ratio, realize the rider's needs from the software logic, and let the rider feel comfortable with every step when facing any working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic diagram of the power-assisted bicycle structure;

[0023] Figure 2 A block diagram of the work to assist the bicycle in operation;

[0024] Figure 3 It is a logic flow chart of constant torque and constant pedaling frequency shifting mode;

[0025] Figure 4 To simulate the logic flow chart of chain transmission mode;

[0026] Figure 5 This is the relationship curve between vehicle speed, pedaling frequency and magnetic resistance.

[0027] Figure 6 Logic flow chart for crank maintenance mode;

[0028] Figure 7 This is the logic flow chart of the extended range and long endurance mode. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, a chainless transmission power-assisting system of an E-Bike comprises a power-assisting bicycle 1; the power-assisting bicycle 1 comprises a generator 5, a generator controller 10, a pedal 6, an electric motor 8, a motor controller 7 and a battery 3; the pedal 6 is connected to the rotor of the generator 5 through a crank transmission, and the generator 5 is installed on the power-assisting bicycle 1; the electric motor 8 drives the rear wheel connected to the power-assisting bicycle 1; the battery 3 is installed on the frame 2 of the power-assisting bicycle 1;

[0031] When the pedal 6 is pedaled, the generator 5 generates electricity, and the motor controller 7 controls the motor 8 to drive the rear wheel of the power-assisted bicycle 1 to rotate, so that the power-assisted bicycle 1 moves forward; when the pedal 6 is not pedaled, the generator 5 does not generate electricity, and the motor controller 7 controls the motor 8 to stop driving the rear wheel of the power-assisted bicycle 1 to rotate, so that the power-assisted bicycle 1 gradually slows down to a stop; the motor controller 7 adjusts the speed of the power-assisted bicycle 1 according to the changes in the pedaling frequency and pedaling force of the pedal 6 collected by the generator controller 10.

[0032] like Figure 2As shown, the generator 5 is electrically connected to the generator controller 10, the generator controller 10 is electrically connected to the motor controller 7, and the motor controller 7 is electrically connected to the motor 8 and the battery 3; the motor controller 7 can adjust the output power of the motor 8 to control the travel speed of the power-assisted bicycle 1. The generator controller 10 transmits the power generated by the generator 5 to the motor controller 7, and the battery 3 also transmits the power in the battery 3 to the motor controller 7; the motor controller 7 controls the distribution of power through its own algorithm. The generator controller 10 collects the pedaling frequency of the pedal 6 and the pedaling force of the pedal 6 through the CAN bus and transmits them to the motor controller 7. The motor controller 7 combines the input signal and the load feedback of the motor 8 through the drive logic algorithm to drive the motor 8 to work, so as to achieve the effect of accurately controlling the movement of the whole vehicle. The generator controller 10 converts the kinetic energy into the power generated by the generator, and supplies power to the drive system or stores it in the battery.

[0033] like Figure 2 As shown, when the power generated by the generator 5 is sufficient for the use of the motor 8, and there is still surplus, the power of the generator 5 can be transmitted from the motor controller 7 to the motor 8, and the surplus power of the generator can be transmitted from the motor controller 7 to the battery to charge the battery; when the power generated by the generator 5 is not enough for the use of the motor 8, the power of the generator 5 is transmitted from the motor controller 7 to the motor 8, and the power of the battery 3 is transmitted from the motor controller 7 to the motor 8, and the generator 5 and the battery simultaneously power the motor 8. The battery simultaneously supplies system power to the motor controller 7 and the generator controller 10, providing power for the operation of the motor controller 7 and the generator controller 10.

[0034] Because the power-assisted bicycle has no chain, the feeling of pedaling by human power comes from the resistance fed back by the generator, which is called magnetic resistance here; the generator 5 has magnetic resistance to the pedal 6, and the generator controller 10 adjusts the size of the magnetic resistance; the power-assisted bicycle 1 includes a constant torque constant pedaling frequency shifting mode and a simulated chain transmission mode; when the power-assisted bicycle 1 enters the constant torque constant pedaling frequency shifting mode, the generator controller 10 adjusts the magnetic resistance of the generator 5 to the pedal to remain unchanged; when the power-assisted bicycle 1 enters the simulated chain transmission mode, the generator controller 10 adjusts the magnetic resistance of the generator 5 to the pedal to change with the speed change of the power-assisted bicycle 1. The generator controller 10 learns the riding needs of the rider through the CAN bus, adjusts the output of the generator magnetic resistance in real time, and acts on the pedal to achieve a more comfortable riding feeling; at the same time, the generator controller 10 can judge the riding condition by analyzing the state of the gyroscope sensor to adjust the magnetic resistance generated by the generator 5 to the pedal 6. The user or rider can adjust the riding mode of the power-assisted bicycle 1 at any time according to their own riding habits; for example, the constant torque constant pedaling frequency shifting mode and the simulated chain transmission mode.

[0035] like Figure 3 As shown, the constant torque constant pedaling frequency shifting mode means that the rider can achieve different speed changes within the comfortable pedaling frequency and pedaling force range set by the rider. When the power-assisted bicycle 1 enters the constant torque constant pedaling frequency shifting mode, the pedaling frequency range rpmA to rpmB is set, and the pedaling force F is set. 踩1 ~F 踩2 ; These can be adjusted and set through the APP, and the pedaling frequency range of the motor controller 7 and the magnetic resistance range of the generator controller 10 are adjusted respectively to complete the setting. Different speeds may correspond to different moods or different riding needs. In order to achieve the same pedaling frequency and pedaling force ranges in the speed range of 0-V1km / h and V1-V2km / h or other set needs, the maximum speed limit can be divided into multiple gears according to the needs, 0-V1km / h corresponds to Auto1 gear, V1-V2km / h corresponds to Auto2 gear, V2-V3km / h corresponds to Auto3 gear, and so on...divided into AutoN gear.

[0036] like Figure 3 As shown, the generator controller 10 is used to detect the actual pedaling frequency of the pedal 6 and transmit it to the motor controller 8; the power-assisted bicycle 1 is in the process of driving, and the gear is AutoN; when the detected actual pedaling frequency is greater than rpmB, and the pedal 6 maintains the actual pedaling frequency for two or more turns, the gear AutoN is increased to AutoN+1; when the detected actual pedaling frequency is less than rpmA, and the pedal 6 maintains the actual pedaling frequency for 3s or more, the gear AutoN is reduced to AutoN-1. The increase in restrictions ensures that the whole vehicle will not frequently shift up and down due to slight changes in pedaling frequency, thereby ensuring the stability of the system speed and riding comfort.

[0037] like Figure 3As shown, for example: when the initial speed is V1km / h, the gear of the power-assisted bicycle 1 is Auto1, and the power-assisted bicycle 1 changes between 0 and V1km / h in the set pedaling frequency range rpmA to rpmB; when the rider wants to ride faster and needs to accelerate, he only needs to increase the pedaling frequency so that the actual pedaling frequency collected exceeds the maximum set pedaling frequency value rpmB in the set pedaling frequency range, and the gear is increased from Auto1 to Auto2, so as to achieve a higher speed riding effect in the same pedaling frequency range; when the rider wants to slow down, he only needs to reduce the pedaling frequency so that the actual pedaling frequency collected is lower than the minimum set pedaling frequency value rpmA in the set pedaling frequency range, and the gear is reduced from Auto2 to Auto1, so as to achieve a low speed riding effect in the same pedaling frequency range, so as to ensure the riding comfort of the rider. The power-assisted bicycle 1 is equipped with a transmission sprocket consisting of several sprockets on the rear wheel. The motor 8 can change the gear of the power-assisted bicycle 1 by driving the transmission sprocket connected to the output end of the motor. The change of the mechanical gear transmission ratio can change the gear of the power-assisted bicycle 1. The large sprocket is used for starting, which is a low gear; the small sprocket is used for high speed, which is a high gear.

[0038] The simulated chain transmission mode is intended to simulate the power ratio and speed ratio of the chain transmission through an algorithm, so that the riding feeling is closer to the chain transmission. When the power-assisted bicycle 1 enters the simulated chain transmission mode, the power-assisted bicycle 1 is in the process of driving; when the speed of the power-assisted bicycle 1 increases, the generator controller 10 increases the magnetic resistance of the generator 5 to the pedal 6; when the speed of the power-assisted bicycle 1 decreases, the generator controller 10 reduces the magnetic resistance of the generator 5 to the pedal 6. The D gear is the normal mode, which is suitable for daily riding needs, and the S gear is the sport mode, which is suitable for more complex working conditions. The maximum magnetic resistance of the S gear is 67% of the maximum magnetic resistance of the D gear. The magnetic resistance of the two gear modes is also divided according to the ratio of the difference in the number of teeth, so as to obtain a corresponding relationship with the vehicle speed; as the vehicle speed increases, the magnetic resistance also increases, allowing the rider to have an easier start and a more comfortable pedaling frequency at high speed.

[0039] When the magnetic resistance is used as the force output by the generator to act on the pedal, it is associated with the vehicle speed based on the ratio of the gear number difference, and the corresponding relationship between the magnetic resistance and the vehicle speed is calibrated as the basis for the generator to output the magnetic resistance. 0% is the minimum value set for no empty feeling, and 100% is the maximum acceptable magnetic resistance value. The generator controller 10 outputs the corresponding magnetic resistance value according to the vehicle speed and feeds it back to the pedal; the output of the magnetic resistance is essentially the generator controller 10 controlling the power generation by adjusting the resistance or current, and driving the generator 5 only requires the human pedaling input power to be greater than the output power of the power generation.

[0040] like Figure 4As shown, the speed of pedaling frequency and the size of pedaling force are two important parameters for collecting human input signals. The motor controller 7 analyzes the rider's riding intention through an algorithm and outputs the corresponding power. Based on the motor structure and cost considerations, the generator of this system is not equipped with a central shaft torque sensor. The speed of pedaling frequency can be collected by phase-changing speed measurement or Hall sensor, and the change of the rider's pedaling force can be intuitively obtained through the torque sensor. The magnetic resistance values ​​of different sizes are preset as standard values, and each magnetic resistance corresponds to a generator output power. When the human pedals on the pedal, in order to overcome the magnetic resistance, the rider needs to increase the force on the foot continuously until the magnetic resistance is overcome and the generator is driven to work. In this process, the change in the size of the rider's pedaling force is judged by comparing the input power of the human pedaling on the pedal with the size of the generator output power corresponding to the preset magnetic resistance. The known vehicle speed and wheel diameter are calculated by the formula: motor speed r / min = vehicle speed kilometers / hour * 1000 * 1000 / (wheel diameter inches * 25.4 * 60 * 3.14); the speed of the rear wheel hub can be calculated, that is, the vehicle speed. The gear ratio can be used to calculate the cadence required for the corresponding vehicle speed; cadence rpm = wheel hub speed rpm / gear ratio.

[0041] like Figure 4 As shown, the magnetic resistance sequence F is set according to different speeds of the power-assisted bicycle 1. 阻 : F 阻1 、F 阻2 ,…,F 阻n ; The magnetic resistance sequence F 阻 The corresponding vehicle speed sequence V: V1, V2, ..., V n , the corresponding set cadence sequence rpm 设 :rpm1, rpm2, ..., rpm n , the corresponding output power sequence of the set generator is P 发 :P 发1 , P 发2 ,…P 发n ;

[0042] When the speed of the power-assisted bicycle 1 is V1, the magnetic resistance is F 阻1 ; When the power P of pedal 6 is stepped on 实 Greater than magnetic resistance F 阻1 Corresponding to the output power P of the generator 5 发1 , and the actual pedaling frequency rpm 实 is greater than the set pedaling frequency rpm1, the speed of the power-assisted bicycle 1 increases from speed V1 to speed V2, and the magnetic resistance increases from F 阻1 Raised to F 阻2 ; If the two conditions cannot be met at the same time, the speed of the power-assisted bicycle 1 is maintained at speed V1;

[0043] When the speed of the power-assisted bicycle 1 is V2, the magnetic resistance is F 阻2 ; When the power P of pedal 6 is stepped on 实 Greater than magnetic resistance F 阻2 Corresponding to the output power P of the generator 5 发2 , and the actual pedaling frequency rpm 实 is greater than the set pedaling frequency rpm2, the speed of the power-assisted bicycle 1 increases from speed V2 to speed V3, and the magnetic resistance increases from F 阻2 Raised to F 阻3 ; If the two conditions cannot be met at the same time, the speed of the power-assisted bicycle 1 returns from speed V2 to speed V1;

[0044] When the speed of the power-assisted bicycle 1 is V3, the magnetic resistance is F 阻3 ; When the power P of pedal 6 is stepped on 实 Greater than magnetic resistance F 阻3 Corresponding to the output power P of the generator 5 发3 , and the actual pedaling frequency rpm 实 is greater than the set pedaling frequency rpm3, the speed of the power-assisted bicycle 1 increases from speed V3 to speed V4, and the magnetic resistance increases from F 阻3 Raised to F 阻4 ; If the two conditions cannot be met at the same time, the speed of the power-assisted bicycle 1 returns from speed V3 to speed V2;

[0045] By analogy, the speed of the power-assisted bicycle 1 during its travel is V n-1 When the magnetic resistance is F 阻n-1 ; When the power P of pedal 6 is stepped on 实 Greater than magnetic resistance F 阻n-1 Corresponding to the output power P of the generator 5 发n-1 , and the actual pedaling frequency rpm 实 Greater than the set cadence rpm n-1 , the speed of the power-assisted bicycle 1 is determined by the speed V n-1 Increase to speed V n , the magnetic resistance is given by F 阻n-1 Raised to F 阻n If both conditions cannot be met at the same time, the speed of the power-assisted bicycle 1 is determined by the speed V n-1 Return speed V n-2 When the rider needs to accelerate, the rider's pedaling frequency and pedaling force will increase. The increase in pedaling force will cause the power of pedaling 6 to increase, which is greater than the magnetic resistance F. 阻n-1The corresponding setting has a large output power of the generator; the output power of the generator is approximately the magnetic resistance multiplied by the number of revolutions of the pedal, which is the pedaling frequency; the actual power of pedaling is approximately the force of pedaling multiplied by the number of revolutions of the pedal, which is the pedaling frequency. When the rider accelerates, the force of the rider pedaling will be much greater than the magnetic resistance at this time. Therefore, the actual power of pedaling will be greater than the output power of the generator when the rider needs to accelerate.

[0046] The magnetic resistance sequence F 阻 : F 阻1 、F 阻2 ,…,F 阻n , the magnetic resistance series is composed of F 阻1 to F 阻n It gradually increases from small to large. 阻1 Minimum, F 阻n Maximum; the magnetic resistance sequence F 阻 The corresponding vehicle speed sequence V: V1, V2, ..., V n , the speed sequence of the power-assisted bicycle 1 is also from small to large from V1 to V2; similarly, the output power sequence of the generator is set from P 发1 To P 发n It also gradually increases from small to large. At the same time, the corresponding magnetic resistance is output to the generator through the corresponding vehicle speed, so that the rider can have a better riding feeling. Figure 5 As shown in the vehicle speed-cadence-magnetic resistance relationship curve, the corresponding magnetic resistance is output according to the corresponding vehicle speed and fed back to the pedal. The motor controller 7 outputs the corresponding vehicle speed according to the rider's pedaling frequency and the change in magnetic resistance input, thereby realizing a riding feeling that simulates automatic chain shifting.

[0047] Specifically, the speed of the power-assisted bicycle 1 can be increased by controlling the output power of the motor 8 through the motor controller 7 to increase the speed of the power-assisted bicycle 1; similarly, the output end of the motor 8 can be controlled to drive a variable speed sprocket connected to a plurality of sprockets of different sizes, and the speed can be changed by changing the sprocket connected to the motor drive; when the speed is increased, the magnetic resistance is increased, while satisfying the riding feel of the rider, and at the same time, increasing the magnetic resistance can increase the power output of the generator 5 to meet the requirement of more electricity required due to the increase in the output power of the motor.

[0048] The chain of a traditional bicycle is connected to the rear wheel hub through the chainring, the rear wheel flywheel and the rear wheel hub. When the rider puts his feet on the pedals, the rear wheel hub and the ground can generate enough friction for the rider to rest his feet. Due to its mechanical characteristics, the magnetic resistance output by the generator is controlled by the generator controller. When it is not powered on or under other set conditions, the magnetic resistance is 0 or the output is too small, which makes it impossible for the rider to rest his feet like a traditional bicycle. Therefore, a crank maintenance mode is set. The magnetic resistance is controlled by the generator controller. When the magnetic resistance is large enough, the rider needs a very large pedaling force to overcome this resistance. Therefore, reasonable control of the magnetic resistance output can achieve the effect of resting the feet. Considering that the general application conditions are that the vehicle is stationary, the crank maintenance state trigger condition is that the speed of the power-assisted bicycle 1 after starting is 0KM / H.

[0049] like Figure 6 As shown, the power-assisted bicycle 1 includes a crank maintenance mode; when it is detected that the speed of the power-assisted bicycle 1 is zero, the power-assisted bicycle 1 enters the crank maintenance mode, and the generator controller 10 controls the generator 5 to increase the magnetic resistance of the pedal 6 to the maximum; when it is detected that the speed of the power-assisted bicycle 1 is not zero, the power-assisted bicycle 1 exits the crank maintenance mode, and the magnetic resistance is restored to the magnetic resistance before the power-assisted bicycle 1 enters the crank maintenance mode; the power-assisted bicycle 1 can be pushed forward for a distance by foot, and the power-assisted bicycle 1 detects the movement of the wheel, so that the speed of the power-assisted bicycle 1 is not zero. When the power-assisted bicycle 1 stays on a slope, such as going uphill, it is necessary to brake to control the power-assisted bicycle from sliding down due to gravity; at this time, the power-assisted bicycle 1 can be controlled to enter or exit the crank maintenance mode by judging the brake signal, and the specific control method is as follows.

[0050] When a traditional ebike is close to a stall state, due to the presence of a chain, the resistance on the pedals increases as the load increases until it enters a stall protection state, the power is interrupted, and the pedals cannot be pedaled. In this generator chainless drive system, all the pedaling magnetic resistance of the rider comes from the generator controller. Therefore, when the motor enters a stall state, human power can still continue to pedal, that is, when the vehicle cannot move, human power can still pedal the crank. If the stall occurs on a slope, it is easy to fall. Therefore, an algorithm is added to make the riding feel more in line with the traditional ebike chain drive while ensuring the safety of the rider. Stall protection is a protection mechanism to protect the motor gears, mechanical structures and electrical components. When the set protection conditions are reached, the motor stops working. By detecting the stall protection conditions, the magnetic resistance is increased in advance until the stall protection state is entered, and then the crank maintenance mode is entered.

[0051] When it is detected that the motor 8 reaches the condition for triggering the stall protection, the generator controller 10 controls to increase the magnetic resistance so that the power-assisted bicycle 1 enters the crank maintenance mode; the stall of the motor 8 includes slow stall and sudden stall.

[0052] When the stall of the motor 8 is a slow stall, the following steps are included:

[0053] S1, check whether the motor 8 outputs full power and maintains it for a certain period of time, otherwise the magnetic resistance remains unchanged, if yes, proceed to the next step;

[0054] S2, detecting whether the rotation speed of the motor 8 is lower than or equal to the first rotation speed, otherwise the magnetic resistance remains unchanged, if yes, the magnetic resistance is increased linearly, and the next step is executed;

[0055] S3, detecting whether the rotation speed of the motor 8 is lower than or equal to the second rotation speed, if not, continuing to increase the magnetic resistance linearly, and if so, the motor 8 enters a stall mode until the speed of the power-assisted bicycle 1 decreases to zero;

[0056] The first rotational speed is greater than the second rotational speed; the first rotational speed may be set to 30 rpm, and the second rotational speed may be set to 20 rpm.

[0057] The above steps are the method steps taken when the motor stalls slowly; when the motor 8 stalls suddenly, the magnetic resistance is increased quickly to quickly reduce the vehicle speed to 0 KM / H, even if the power-assisted bicycle 1 quickly enters the crank holding mode.

[0058] like Figure 6 As shown, the brake signal of the power-assisted bicycle 1 is transmitted to the motor controller, and the brake signal includes a low level and a high level; when the power-assisted bicycle is running, when the brake signal is at a low level, the power-assisted bicycle 1 enters the crank maintenance mode; when the brake signal is at a high level, the power-assisted bicycle 1 exits the crank maintenance mode. The brake can be set with a switch signal, and the brake signal is transmitted to the motor controller 7; when the brake is pressed and the speed of the power-assisted bicycle 1 is reduced to 0KM / H, the power-assisted bicycle 1 enters the crank maintenance mode and can rest. At this time, the brake signal is at a low level. When the brake is not released, the brake signal is a low voltage, and when the brake is released, the brake signal is still a low voltage; after the brake signal becomes a low voltage, when the brake is pressed again, the brake signal becomes a high voltage, and the power-assisted bicycle 1 exits the crank maintenance mode and can continue to move forward; when the brake is pressed but the speed of the power-assisted bicycle 1 is not reduced to 0KM / H, the power-assisted bicycle 1 does not enter the crank maintenance mode. When in the crank maintenance state, the generator controller needs to detect the brake signal that changes from a low level to a high level and cancel the crank maintenance state.

[0059] Similarly, another control mode is set, in which the brake signal is at a low level when the brake is pressed and not released, and the brake signal is at a high level when the brake is released; at this time, during riding, when the brake is pressed and not released, the brake signal is transmitted to the motor controller, and the motor controller sends a signal to the generator controller, so that the generator controller controls the magnetic resistance to increase to the maximum, and the power-assisted bicycle 1 can also enter the crank maintenance mode, and the pedal 6 cannot be stepped on; when the brake is released, the generator controller controls the magnetic resistance to return to the original magnetic resistance, and the power-assisted bicycle 1 exits the crank maintenance mode, and the pedal 6 can be stepped on to continue riding.

[0060] Example

[0061] The chainless transmission power-assisting system of the present invention realizes the extended-range solution through an algorithm. The generator can be used as a sensor device to collect the rider's pedaling frequency and pedaling force changes, and can also be used as a damper to simulate the human riding foot feel feedback. However, it is itself a power generation device that can convert human input kinetic energy into electrical energy to drive the motor or store it in a battery.

[0062] During the conversion or transfer of energy, the total amount remains unchanged; therefore, when the generator converts kinetic energy into electrical energy, its total energy remains unchanged. However, considering the transmission efficiency of the mechanical connection, the conversion efficiency of kinetic energy into electrical energy cannot reach 1. Therefore, in theory, the range-extending generator cannot achieve true labor-saving without the help of an external power supply. Therefore, this system adjusts the power generation by controlling the output of the generator magnetic resistance, and limits the power of the motor according to the power generation. It is set through an algorithm that when the battery capacity is less than or equal to a certain percentage, it is forced to enter the extended range and long endurance mode to increase the endurance and ensure the operation requirements of long endurance. The power-assisted bicycle will automatically enter the extended range and long endurance mode only when the battery power is low.

[0063] like Figure 7 As shown, specifically, the power in the battery 3 is detected in real time. When it is detected that the power of the battery 3 is greater than the set battery capacity value, the power is output normally; when it is detected that the power of the battery 3 is lower than or equal to the set battery capacity value, the extended range and long endurance mode is entered. At this time, the generator controller 10 adjusts the magnetic resistance according to the algorithm, that is, increases the magnetic resistance, drives the generator, so as to increase the output power of the generator; the power output of the generator is transmitted to the motor controller, at this time the battery still provides power to the motor controller 7, and the motor controller 7 transmits the power to the motor to drive the motor 8, and limits the output power of the motor 8 to increase the cruising range of the power-assisted bicycle.

[0064] The chainless transmission power-assisting system of the present invention is a chainless transmission, and the power source is the engine. Therefore, in order to ensure the vehicle drive, the power interruption caused by non-emergency or necessary fault codes is reduced as much as possible. In case of speed measurement Hall fault, the generator and the motor are both Hall speed measurement. Assuming that the Hall fails, the phase-changing speed measurement method can be used to realize the speed measurement of the movement, calculate the input of the pedaling frequency and the output of the vehicle speed. In case of phase-changing Hall fault, the generator and the motor can calculate the speed of the movement by collecting the periodic changes of the reverse electromotive force, thereby ensuring the phase-changing function of the motor and driving the motor to operate normally.

[0065] The above is only a description of the preferred embodiments of the present invention. Ordinary technicians in this technical field can make several modifications and optimizations based on the above disclosure without departing from the above basic principles. These improvements and optimizations should be regarded as the understood protection scope of the present invention.

Claims

1. A chainless transmission power-assisting system for an E-Bike, characterized in that: The invention comprises a power-assisted bicycle (1); the power-assisted bicycle (1) comprises a generator (5), a generator controller (10), pedals (6), an electric motor (8), a motor controller (7) and a battery (3); the pedals (6) are connected to the rotor of the generator (5) through a crank transmission, and the generator (5) and the battery (3) are installed on the power-assisted bicycle (1); the electric motor (8) drives the rear wheel connected to the power-assisted bicycle (1); When the pedal (6) is pedaled, the generator (5) generates electricity, and the motor controller (7) controls the motor (8) to drive the rear wheel of the power-assisted bicycle (1) to rotate, so that the power-assisted bicycle (1) moves forward; when the pedal (6) is not pedaled, the generator (5) does not generate electricity, and the motor controller (7) controls the motor (8) to stop driving the rear wheel of the power-assisted bicycle (1) to rotate, so that the power-assisted bicycle (1) gradually decelerates to a stop; the motor controller (7) adjusts the speed of the power-assisted bicycle (1) according to the changes in the pedaling frequency and pedaling force of the pedal (6) collected by the generator controller (10).

2. The chainless transmission power-assisting system for an E-Bike according to claim 1, characterized in that: The generator (5) has a magnetic resistance to the pedals (6), and the generator controller (10) regulates the magnitude of the magnetic resistance; the power-assisted bicycle (1) comprises a constant torque constant pedaling frequency gear shifting mode and a simulated chain transmission mode; when the power-assisted bicycle (1) enters the constant torque constant pedaling frequency gear shifting mode, the generator controller (10) regulates the magnetic resistance of the generator (5) to the pedals to remain unchanged; when the power-assisted bicycle (1) enters the simulated chain transmission mode, the generator controller (10) regulates the magnetic resistance of the generator (5) to the pedals to change in accordance with the speed of the power-assisted bicycle (1).

3. The chainless transmission power-assisting system for an E-Bike according to claim 2, characterized in that: When the power-assisted bicycle (1) enters a constant torque constant pedaling frequency shifting mode, a riding pedaling frequency range of rpmA to rpmB is set, and a generator controller (10) is used to detect the actual pedaling frequency of the pedals (6) and transmit it to the motor controller (8); the power-assisted bicycle (1) is in the process of running, and the gear position is AutoN; when the detected actual pedaling frequency is greater than rpmB, and the pedals (6) maintain the actual pedaling frequency for two turns or more, the gear position AutoN is increased to AutoN+1; when the detected actual pedaling frequency is less than rpmA, and the pedals (6) maintain the actual pedaling frequency for 3 seconds or more, the gear position AutoN is reduced to AutoN-1.

4. The chainless transmission power-assisting system for an E-Bike according to claim 2, characterized in that: When the power-assisted bicycle (1) enters the simulated chain transmission mode, the power-assisted bicycle (1) is in the process of running; when the speed of the power-assisted bicycle (1) increases, the generator controller (10) increases the magnetic resistance of the generator (5) to the pedal (6); when the speed of the power-assisted bicycle (1) decreases, the generator controller (10) reduces the magnetic resistance of the generator (5) to the pedal (6).

5. The chainless transmission power-assisting system for an E-Bike according to claim 4, characterized in that: The magnetic resistance sequence F is set according to different speeds of the power-assisted bicycle (1) 阻 : F 阻1 、F 阻2 ,…,F 阻n ; The magnetic resistance sequence F 阻 The corresponding vehicle speed sequence V: V1, V2, ..., V n , the corresponding set cadence sequence rpm 设 :rpm1, rpm2, ..., rpm n , the corresponding output power sequence of the set generator is P 发 :P 发1 , P 发2 ,…P 发n ; When the speed of the power-assisted bicycle (1) is V1, the magnetic resistance is F 阻1 ; When the power P of pedal (6) is stepped on 实 Greater than magnetic resistance F 阻1 Corresponding to the output power P of the generator (5) 发1 , and the actual pedaling frequency (6) rpm 实 is greater than the set pedaling frequency rpm1, the speed of the power-assisted bicycle (1) increases from speed V1 to speed V2, and the magnetic resistance increases from F 阻1 Raised to F 阻2 If both conditions cannot be met at the same time, the speed of the power-assisted bicycle (1) is maintained at speed V1; When the speed of the power-assisted bicycle (1) is V2, the magnetic resistance is F 阻2 ; When the power P of pedal (6) is stepped on 实 Greater than magnetic resistance F 阻2 Corresponding to the output power P of the generator (5) 发2 , and the actual pedaling frequency (6) rpm 实 When the pedaling frequency is greater than the set rpm2, the speed of the power-assisted bicycle (1) increases from speed V2 to speed V3, and the magnetic resistance increases from F 阻2 Raised to F 阻3 If both conditions cannot be met at the same time, the speed of the power-assisted bicycle (1) returns from speed V2 to speed V1; When the power-assisted bicycle (1) is running at a speed of V3, the magnetic resistance is F 阻3 ; When the power P of pedal (6) is stepped on 实 Greater than magnetic resistance F 阻3 Corresponding to the output power P of the generator (5) 发3 , and the actual pedaling frequency (6) rpm 实 is greater than the set pedaling frequency rpm3, the speed of the power-assisted bicycle (1) increases from speed V3 to speed V4, and the magnetic resistance increases from F 阻3 Raised to F 阻4 If both conditions cannot be met at the same time, the speed of the power-assisted bicycle (1) returns from speed V3 to speed V2; By analogy, the speed of the power-assisted bicycle (1) during its travel is V n-1 When the magnetic resistance is F 阻n-1 ; When the power P of pedal (6) is stepped on 实 Greater than magnetic resistance F 阻n-1 Corresponding to the output power P of the generator (5) 发n-1 , and the actual pedaling frequency (6) rpm 实 Greater than the set cadence rpm n-1 , the speed of the power-assisted bicycle (1) is determined by the speed V n-1 Increase to speed V n , the magnetic resistance is given by F 阻n-1 Raised to F 阻n If both conditions cannot be met at the same time, the speed of the power-assisted bicycle (1) is determined by the speed V n-1 Return speed V n-2 .

6. The chainless transmission power-assisting system for an E-Bike according to claim 1, characterized in that: The power-assisted bicycle (1) includes a crank maintenance mode; when it is detected that the speed of the power-assisted bicycle (1) is zero, the power-assisted bicycle (1) enters the crank maintenance mode, and the generator controller (10) controls the magnetic resistance of the generator (5) to the pedal (6) to increase to the maximum; When it is detected that the speed of the power-assisted bicycle (1) is not zero, the power-assisted bicycle (1) exits the crank maintenance mode, and the magnetic resistance force is restored to the magnetic resistance force immediately before the power-assisted bicycle 1 enters the crank maintenance mode.

7. The chainless transmission power-assisting system for an E-Bike according to claim 6, characterized in that: When it is detected that the motor (8) reaches the condition for triggering the stall protection, the magnetic resistance is increased so that the power-assisted bicycle (1) enters the crank maintenance mode; the stall of the motor (8) includes slow stall and sudden stall.

8. The chainless transmission power-assisting system for an E-Bike according to claim 7, characterized in that: When the stall of the motor (8) is a slow stall, the method comprises the following steps: S1, detect whether the motor (8) outputs full power and maintains it for a certain period of time, otherwise the magnetic resistance remains unchanged, and if so, proceed to the next step; S2, detecting whether the rotation speed of the motor (8) is lower than or equal to the first rotation speed, if not, the magnetic resistance remains unchanged, if yes, the magnetic resistance is increased linearly, and the next step is executed; S3, detecting whether the rotation speed of the motor (8) is lower than or equal to the second rotation speed, if not, continuing to increase the magnetic resistance linearly, and if so, the motor (8) enters a stall mode until the speed of the power-assisted bicycle (1) decreases to zero; The first rotation speed is greater than the second rotation speed.

Images