Pedal depression sensing device and infinitely variable power assist control system

Abstract

This invention discloses a pedal pressure sensing device and an analog signal synchronous stepless power assist control system, applicable to the field of electric bicycles. It includes a torque sensor with a fixed housing on one side, and a rotating disk inside the housing. The invention achieves this by rotating the disk inside the housing. An infrared sensor emits infrared light that passes through an infrared blocking hole. Utilizing the weight of the ball bearings at the bottom of the rotating disk, the torque sensor remains fixed while the rotating disk rotates, repeatedly blocking the infrared light from the sensor through the infrared blocking hole. The infrared sensor sends an analog uphill signal to the electric bicycle controller, which controls the inverter to synchronously adjust the power of the assist motor based on the number of blocking cycles indicated by the infrared sensor. The user only needs to place their foot on the pedal connected to the torque sensor to actively climb hills.

Description

Technical Field

[0001] This invention relates to the field of electric bicycles, and particularly to a pedal pressure sensing device and a continuously variable power assist control system. Background Technology

[0002] A power-assisted bicycle is a new type of two-wheeled vehicle, a type of bicycle, which uses a battery as an auxiliary power source, is equipped with a motor, and has a power assistance system, making it a new type of transportation that integrates human riding and motor assistance.

[0003] Currently, the sensing device connecting the electric bicycle and the pedal adjusts the power of the electric motor based on the force of the user's pedaling.

[0004] This method of adjusting the power of the assist motor has obvious drawbacks. Regardless of the slope, the assist bicycle still requires human effort to apply force to the pedals. Once the user stops applying force to the pedals, the assist effect will be lost. Therefore, it can only reduce the force required by the user to go uphill, and cannot meet the requirements for active climbing on inclines.

[0005] To address the aforementioned problems, we propose a pedal pressure sensing device and a continuously variable power assist control system. Summary of the Invention

[0006] The purpose of this invention is to provide a pedal pressure sensing device and a stepless power assist control system, which has the advantage of being able to actively climb hills without requiring the user to apply force to the pedal.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a pedal pressure sensing device, including a torque sensor, a fixed housing is fixedly installed on one side of the torque sensor, a rotating disk is provided inside the fixed housing, a plurality of infrared blocking through holes are opened inside the rotating disk, a plurality of infrared continuous through slots are also opened inside the rotating disk, an infrared sensor is installed inside the fixed housing, the infrared sensor includes an infrared emitter and an infrared receiver, the infrared emitter and the infrared receiver correspond to each other.

[0008] By adopting the above technical solution, by setting up a fixed shell, a rotating disk, an infrared blocking through hole, an infrared continuous through slot, an infrared sensor, and a counterweight, the counterweight always faces downwards when going uphill, which can make the rotating disk rotate. This allows the infrared light from the infrared sensor to be blocked multiple times through the infrared blocking through hole, so that the infrared sensor can detect that the electric bicycle is in an uphill state, thereby providing assistance to the user.

[0009] The present invention is further configured such that: a counterweight is fixedly connected to the surface of the rotating disk, and the side of the counterweight away from the rotating disk does not contact the fixed shell.

[0010] By adopting the above technical solution, the counterweight is used to increase the weight at the bottom of the rotating disk, so that the counterweight can always be in the same position when the electric bicycle is on a slope of different angles, thereby causing the rotating disk to rotate to block the infrared light from the infrared sensor or not block the infrared light from the infrared sensor.

[0011] The present invention is further configured such that: two fixing blocks are bolted to both sides of the inner cavity of the fixing shell, and a ball bearing is fixedly connected to the side of the fixing block near the rotating disk.

[0012] By adopting the above technical solution, the fixed block provides support for the ball bearings, ensuring that the rotating disk can slide through the guide groove and the ball bearings, and remain in a fixed position.

[0013] The present invention is further configured such that guide grooves are provided on both sides of the rotating disk, and the interior of the guide grooves is slidably connected to the surface of the ball.

[0014] By adopting the above technical solution, the ball bearings and guide grooves play a limiting and guiding role for the rotating disk. At the same time, when the rotating disk rotates, the ball bearings and guide grooves are slidably connected, which can ensure that the rotating disk rotates in a fixed position.

[0015] The present invention is further configured such that: a through groove is provided inside the fixed shell, and the inside of the through groove does not contact the torque sensor.

[0016] By adopting the above technical solution, the setting of the through slot one ensures that the fixed shell will not affect the normal rotation of the two output ends of the torque sensor, thus ensuring that the torque sensor can sense torque when the user presses the pedal.

[0017] The present invention is further configured such that: a second through groove is provided inside the rotating disk, and the inside of the second through groove does not contact the torque sensor.

[0018] By adopting the above technical solution and setting the second through slot, the rotation of the rotating disk and the operation of the torque sensor are not correlated.

[0019] The present invention is further configured such that the infrared transmitter and the infrared receiver are respectively installed on the sides of the fixed shell cavity away from the rotating disk.

[0020] By adopting the above technical solution, through the setting of infrared transmitter and infrared receiver, the infrared transmitter is the infrared emitting end and the infrared receiver is the receiving end. When the rotating disk rotates, the infrared transmitter and infrared receiver are continuously isolated by multiple infrared blocking through holes, which can indicate the current angle of the electric bicycle facing the slope, thus facilitating the provision of assistance to the electric bicycle through the controller. The fixing of the infrared transmitter and infrared receiver to the inner wall of the fixed shell ensures the stability of the infrared transmitter and infrared receiver during use.

[0021] The above-mentioned technical objective of the present invention is also achieved through the following technical solution: an analog signal synchronous stepless power assist control system, including a controller and a pedal pressure sensing device, wherein the input terminal of the controller is electrically connected to an infrared sensor, a battery and a torque sensor respectively, the output terminal of the controller is electrically connected to a frequency converter, the output terminal of the torque sensor is electrically connected to an inductive switch, the output terminal of the inductive switch is electrically connected to the infrared sensor, and the output terminal of the frequency converter is electrically connected to an assist motor.

[0022] By adopting the above technical solution, an infrared sensor is set up to detect whether the electric bicycle is going uphill. By sensing multiple infrared isolation holes passed by the infrared sensor, it is possible to simulate whether the electric bicycle is going uphill or downhill. In this way, the power of the frequency converter is increased or decreased in real time to perform stepless power adjustment.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. This invention involves setting a rotating disk inside a fixed housing, and using an infrared sensor to emit infrared rays that pass through an infrared blocking hole. Utilizing the weight of the ball bearings at the bottom of the rotating disk, the torque sensor of the electric bicycle remains stationary on an uphill slope. The rotating disk rotates, repeatedly blocking the infrared rays from the infrared sensor through the infrared blocking hole. The infrared sensor sends an analog uphill signal to the electric bicycle controller, which then controls the frequency converter to synchronously adjust the power of the electric bicycle motor based on the number of blocking cycles indicated by the infrared sensor.

[0025] 2. By employing a torque sensor, an inductive switch, and an infrared sensor, this invention can provide uphill assistance to the electric bicycle under the action of a rotating disc, an infrared isolation through-hole, an infrared sensor, and an assist controller. However, the torque sensor no longer requires the user to apply force; the user only needs to place their foot on the footrest connected to the torque sensor, thus meeting the requirements for active climbing. Attached Figure Description

[0026] Figure 1 This is a three-dimensional view of the structure of the present invention;

[0027] Figure 2 This is a cross-sectional view of the fixed shell of the present invention;

[0028] Figure 3 This is the present invention. Figure 2 Enlarged view of the structure at point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of this invention used on an uphill slope;

[0030] Figure 5 This is a schematic diagram illustrating the application of the present invention on road sections without uphill or downhill sections;

[0031] Figure 6 This is a schematic diagram of the practical structure used downhill;

[0032] Figure 7 This is a schematic diagram of the control system of the present invention.

[0033] Reference numerals in the attached drawings: 1. Torque sensor; 2. Fixed housing; 3. Rotating disk; 4. Infrared isolation through hole; 5. Infrared continuous through slot; 6. Infrared sensor; 61. Infrared transmitter; 62. Infrared receiver; 7. Counterweight; 8. Fixed block; 9. Ball bearing; 10. Guide groove; 11. Through slot one; 12. Through slot two. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Example 1:

[0036] refer to Figure 1 - Figure 7 The pedal pressure sensing device includes a torque sensor 1, a fixed housing 2 fixedly installed on one side of the torque sensor 1, a rotating disk 3 inside the fixed housing 2, multiple infrared isolation through holes 4 inside the rotating disk 3, and several infrared continuous through slots 5 inside the rotating disk 3. An infrared sensor 6 is installed inside the fixed housing 2, the infrared sensor 6 includes an infrared transmitter 61 and an infrared receiver 62, the infrared transmitter 61 and the infrared receiver 62 correspond to each other; by using the torque sensor 1, the inductive switch and the infrared sensor 6, when going uphill, the rotating disk 3, the infrared isolation through holes 4, the infrared sensor 6 and the power assist controller can provide uphill assistance to the electric bicycle, but the torque sensor 1 no longer requires the user to apply force, only the user's foot needs to be placed on the foot pedal connected to the torque sensor 1, thus meeting the requirements for active climbing.

[0037] Furthermore, a counterweight 7 is fixedly connected to the surface of the rotating disk 3. The side of the counterweight 7 away from the rotating disk 3 does not contact the fixed shell 2. The counterweight 7 is used to increase the weight at the bottom of the rotating disk 3, so that the counterweight 7 can always be in the same position when the electric bicycle is on a slope of different angles, thereby causing the rotating disk 3 to rotate to block the infrared light of the infrared sensor 6 or not block the infrared light of the infrared sensor 6.

[0038] Furthermore, two fixing blocks 8 are bolted to both sides of the inner cavity of the fixed shell 2. A ball bearing 9 is fixedly connected to the side of the fixing block 8 near the rotating disk 3. By setting the fixing block 8, the ball bearing 9 is supported, ensuring that the rotating disk 3 can slide through the guide groove 10 and the ball bearing 9 and always stay in a fixed position.

[0039] Furthermore, guide grooves 10 are provided on both sides of the rotating disk 3. The inside of the guide groove 10 is slidably connected to the surface of the ball 9. Through the action of the ball 9 and the guide groove 10, the rotating disk 3 plays a limiting and guiding role. At the same time, when the rotating disk 3 rotates, the ball 9 and the guide groove 10 are slidably connected, which can ensure that the rotating disk 3 rotates in a fixed position.

[0040] Furthermore, the interior of the fixed housing 2 is provided with a through groove 11. The interior of the through groove 11 does not contact the torque sensor 1. By setting the through groove 11, the fixed housing 2 will not affect the normal rotation of the two output ends of the torque sensor 1, ensuring that the torque sensor 1 can sense torque when the user presses the pedal.

[0041] Furthermore, the interior of the rotating disk 3 is provided with a through groove 2 12. The interior of the through groove 2 12 does not contact the torque sensor 1. By setting the through groove 2 12, the rotation of the rotating disk 3 and the operation of the torque sensor 1 are not related.

[0042] Furthermore, the infrared transmitter 61 and the infrared receiver 62 are respectively installed on the sides of the inner cavity of the fixed shell 2 away from the rotating disk 3. Through the setting of the infrared transmitter 61 and the infrared receiver 62, the infrared transmitter 61 is the infrared emitting end and the infrared receiver 62 is the receiving end. When the rotating disk 3 rotates, the infrared transmitter 61 and the infrared receiver 62 are continuously isolated by multiple infrared blocking through holes 4, which can indicate the current angle of the electric bicycle facing the slope, so as to facilitate the controller to provide assistance to the electric bicycle. The fixing of the infrared transmitter 61 and the infrared receiver 62 to the inner wall of the fixed shell 2 ensures the stability of the infrared transmitter 61 and the infrared receiver 62 during use.

[0043] The analog signal synchronous stepless power assist control system includes a controller and a pedal pressure sensing device. The controller's input terminals are electrically connected to an infrared sensor 6, a battery, and a torque sensor 1. The controller's output terminal is electrically connected to a frequency converter. The output terminal of the torque sensor 1 is electrically connected to an inductive switch. The output terminal of the inductive switch is electrically connected to the infrared sensor 6. The output terminal of the frequency converter is electrically connected to the assist motor. A rotating disk 3 rotates inside a fixed housing 2. Infrared rays emitted by the infrared sensor 6 pass through the infrared blocking hole 4. Utilizing the weight of the ball bearings 9 at the bottom of the rotating disk 3, the torque sensor 1 of the assist vehicle maintains its original fixed state when going uphill. When turntable 3 rotates, the infrared light from infrared sensor 6 is repeatedly interrupted through infrared isolation through-hole 4. Infrared sensor 6 sends an analog uphill signal to the scooter controller. The scooter controller controls the frequency converter to synchronously adjust the power of the assist motor according to the number of interruptions given by infrared sensor 6. By using torque sensor 1, inductive switch and infrared sensor 6, when going uphill, the turntable 3, infrared isolation through-hole 4, infrared sensor 6 and assist controller can provide uphill assistance to the scooter. However, the torque sensor 1 no longer requires the user to apply force. The user only needs to place their foot on the footrest connected to the torque sensor 1, thus meeting the requirements for active climbing.

[0044] Brief description of the usage process: When facing an uphill slope, the user places their foot on the pedal of the electric bicycle. The torque sensor 1 detects the force on the pedal, which triggers the induction switch to start. The induction switch controls the infrared sensor 6 to start. After the infrared sensor 6 is started, the infrared transmitter 61 of the infrared sensor 6 emits infrared rays. The infrared rays are received by the infrared receiver 62 through the infrared continuous through-slot 5.

[0045] As the uphill angle increases, the torque sensor 1 and the electric bicycle remain in a fixed position, but the rotating disc 3 will rotate as the electric bicycle goes uphill. Under the weight of the ball bearing 9, the ball bearing 9 will always remain downward while the rotating disc 3 will rotate. When the rotating disc 3 rotates, there are obstructions between the multiple infrared blocking holes 4 inside the rotating disc 3, which will block the infrared light. As the infrared blocking holes 4 block the infrared light of the infrared sensor 6, the infrared sensor 6 will sense the signal disconnection and connection repeatedly, thus simulating the uphill signal and transmitting it to the electric bicycle controller. After receiving the signal, the electric bicycle controller will control the frequency converter to supply voltage to the electric motor, thereby gradually increasing the power of the electric motor and performing stepless power distribution control of the electric motor. At this time, the user only needs to place his foot on the pedal of the electric bicycle so that the torque sensor 1 can sense the weight, and the electric bicycle can actively climb the hill without the user having to apply force to the pedal. If it is necessary to stop, the electric bicycle can be stopped by using the brake without removing the foot from the pedal.

[0046] Because the slope continues upwards, the infrared blocking hole 4 will continuously block the infrared signal of the infrared sensor 6 during the uphill process.

[0047] When the bicycle goes uphill, the electric bicycle and torque sensor 1 are in a flat state. The rotating disk 3 will reset as the electric bicycle changes state. After the rotating disk 3 resets, the infrared light from the infrared sensor 6 will pass through the infrared continuous groove 5. When the electric bicycle is on a stable road surface or going downhill, the rotating disk 3 will not rotate on a stable road surface, but it will rotate when going downhill. When the rotating disk 3 rotates, due to gravity, the infrared light from the infrared sensor 6 will always be inside the infrared continuous groove 5. Since there is no obstruction inside the infrared continuous groove 5, the infrared sensor 6 will not simulate an uphill signal to provide assistance.

[0048] At the same time, torque sensor 1 is also connected to the electric bicycle controller. Applying force to torque sensor 1 can also send an assist command to the electric bicycle controller.

[0049] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A pedal pressure sensing device, including a torque sensor (1), characterized in that: A fixed housing (2) is fixedly installed on one side of the torque sensor (1). A rotating disk (3) is provided inside the fixed housing (2). The rotating disk (3) can rotate relative to the fixed housing (2). Multiple infrared blocking through holes (4) are opened inside the rotating disk (3). A counterweight (7) is fixedly connected to the surface of the rotating disk (3). The side of the counterweight (7) away from the rotating disk (3) does not contact the fixed housing (2). Several infrared continuous through slots (5) are also opened inside the rotating disk (3). An infrared sensor (6) is installed inside the fixed housing (2). The device (6) includes an infrared emitter (61) and an infrared receiver (62), which correspond to each other. The infrared emitter (61) and the infrared receiver (62) are respectively installed on the sides of the fixed shell (2) away from the rotating disk (3). When the infrared light of the infrared sensor (6) is blocked by the plurality of infrared blocking through holes (4), the infrared sensor (6) outputs an uphill signal. When the infrared light of the infrared sensor (6) passes through the interior of the infrared continuous through slot (5), the infrared sensor (6) does not output an uphill signal.

2. The pedal pressure sensing device according to claim 1, characterized in that: Two fixing blocks (8) are bolted to both sides of the inner cavity of the fixed shell (2), and a ball bearing (9) is fixedly connected to the side of the fixing block (8) near the rotating disk (3).

3. The pedal pressure sensing device according to claim 1, characterized in that: The rotating disk (3) has guide grooves (10) on both sides, and the interior of the guide grooves (10) is slidably connected to the surface of the ball (9).

4. The pedal pressure sensing device according to claim 1, characterized in that: The fixed shell (2) has a through groove (11) inside, and the inside of the through groove (11) does not contact the torque sensor (1).

5. The pedal pressure sensing device according to claim 1, characterized in that: The rotating disk (3) has a through groove (12) inside, and the inside of the through groove (12) does not contact the torque sensor (1).

6. An analog signal synchronous stepless power assist control system, comprising a controller and a pedal pressure sensing device according to any one of claims 1-5, characterized in that: The input terminals of the controller are electrically connected to an infrared sensor (6), a battery, and a torque sensor (1), respectively. The output terminal of the controller is electrically connected to a frequency converter. The output terminal of the torque sensor (1) is electrically connected to an induction switch. The output terminal of the induction switch is electrically connected to the infrared sensor (6). The output terminal of the frequency converter is electrically connected to an auxiliary motor.

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