A crankshaft torque sensor and sensing detection method for a hybrid electric bicycle
A technology of torque sensor and hybrid power, which is applied in vehicle parts, rider driving, transportation and packaging, etc. It can solve the problems of poor power-assist experience, complex and ugly torque sensor, etc., and achieve the effect of low manufacturing cost and simple structure
Active Publication Date: 2017-10-27
SHENZHEN HOMETECH TECH CO LTD
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Problems solved by technology
[0004] 1. Simple strain gauge sensor: This sensor uses strain gauges or springs to sense the pedal force of the rider when riding, but it is greatly affected by natural environmental factors (temperature, muddy water, dust, etc.), especially those caused by road bumps Misoperation is difficult to overcome. At the same time, the processing of mechanical structural parts is complicated, the processing cost is high, metal fatigue and wear are prone to occur, and the service life is short.
[0005] 2. Torque sensor: The pedal torque data obtained in this way is more accurate. At present, Germany’s FAG company, THUN company, and domestic Suzhou Jiecheng Technology have all launched center-axis torque sensors, but the torque sensors are very complicated, expensive, and Increase the difficulty of maintenance and make it difficult to use on a large scale
[0006] 3. Hall speed sensor: This scheme uses permanent light iron and Hall sensor. The frequency of the pulse signal output by the Hall sensor to the controller is proportional to the pedal speed of the rider. Because the change of pedal speed is related to the pedal torque The change of the light pole is correlated and can reflect the change of the pedal torque to a certain extent. However, in traditional use, 5 to 6 light poles are generally set, and the interval is relatively large. Only when the permanent light iron on the light steel plate passes through the Huo Only when the Hall sensor is used, the rotation signal can be captured by the Hall sensor, so that the Hall sensor cannot sense the light iron at the moment of pedaling. Therefore, the existing sensing method has a certain delay in time and cannot be sensed in time. Variety
[0007] 4. Photoelectric speed sensor: The ingeniously designed ring grating can be very dense, and the effect of analog torque and corresponding output power is much more natural than that of the Hall speed sensor. Although the cost is low, the power consumption current is small, and there is no effect of absorbing iron impurities, However, as a discrete product, it needs to be installed on the vehicle body together with the controller when used, and the volume is relatively large; in addition, the photoelectric switch tube needs special mold opening due to the hood, which increases the development cost
[0008] 5. Motor with built-in torque sensor: By embedding a sensor in the motor to sense the torque change, the motor can directly feed back the pedal torque. This way the motor has a complex structure, is expensive, and is difficult to maintain
[0009] Therefore, the problems existing in the existing sensors are either poor power-assist experience, complex structure, large installation volume, high development cost, high price, poor working reliability, and difficulty in large-scale use.
[0010] In addition, the existing electric vehicle controllers and sensors are generally two separate components, which generally have the problem of large size. It is very ugly to install on the vehicle, and it is exposed to the outside and requires regular maintenance. It is difficult to achieve a simple and beautiful effect.
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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0050] The crankshaft type torque sensor of the hybrid bicycle according to the present invention converts the spring deformation generated by pedaling force on the spring 202 into a pulse sequence with a variable duty ratio through the photoelectric switch pair tube 101 and the grating ring structure 204, The duty cycle of the pulse sequence reflects the relative motion between the fixed disk 10 and the rotating disk, and a set of photoelectric switches is used to realize the convenient measurement of the torque on the tube 101, and the obtained pulse sequence is processed into a value correspondin...
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The present invention is applicable to the bicycle technology, and provides a crankshaft type torque sensor for a hybrid bicycle, including a fixed disk, a rotating disk, a motor control circuit board and a pair of photoelectric switch tubes; the fixed disk includes an end cover of the fixed disk; the rotating disk includes an active mechanism and The driven mechanism, the active mechanism includes a crank, and grooves are evenly distributed on one end of the crank; the driven mechanism includes a spring, a grating ring structure, a central axis and an outer ring of the rotating disk, and the grating ring structure is fixed on the outer ring of the rotating disk, and the central axis One end is fixed on the crank; one side of the outer ring of the rotating disk is provided with a groove, and the crank and the groove of the outer ring of the rotating disk are connected to form a spring groove for placing the spring; when the crank rotates, the spring is compressed to drive the grating ring structure Rotation, the photoelectric switch senses the rotation of the grating ring structure and generates a pulse sequence with variable duty ratio, and sends the pulse sequence to the motor control circuit board. The chain wheel type torque sensor of the hybrid electric bicycle can realize torque sensing, and has a simple structure and low manufacturing cost.
Description
technical field [0001] The invention belongs to the technical field of bicycles, and in particular relates to a chain wheel type torque sensor of a hybrid electric bicycle and a sensing detection method. Background technique [0002] At present, domestic electric vehicles are mainly pure electric vehicles, and riders do not need to use force. This kind of vehicle has strict road restrictions abroad. In Japan, the European Union and other countries, pure electric bicycles are classified as motor vehicle management, but they are more popular in my country. . Electric power-assisted bicycles, commonly known as hybrid bicycles, are not only a green and environmentally friendly means of transportation, but also a very convenient fitness equipment. They are more popular abroad. The principle of a hybrid bicycle is to transmit the pedaling force of a person to the controller through a torque sensor, and the controller controls the motor to output a corresponding torque boost. The o...
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IPC IPC(8): B62M6/50B62M6/45
Inventor尹响玲李斌
OwnerSHENZHEN HOMETECH TECH CO LTD