Talking about the advantages and disadvantages of torque sensors

Issuing time:2022-01-13 14:20

With the development of technology, especially in Japan, Europe and the United States, the promotion of bicycles as a form of personal transportation, "torque sensors" were finally applied to bicycles. As mentioned at the beginning, the biggest difference between "torque sensor" and "rear axle hook sensor" is in the understanding of "force", while "bilateral torque sensor" can measure the force of two pedals. It is mainly about this kind of sensor with more technological content.

Compared with the backward "rear axle hook sensor", the advantages of the bilateral torque sensor are extremely obvious. It is mainly installed between the crank and the chainring, that is, the outer side of the bottom bracket, and some are directly installed on the center axle. There is no absolute rigid body in the world, so the central axis will produce extremely small torsional deformation when it is stressed. By measuring the subtle deformation signal on the surface of the central axis, the magnitude of the current stepping moment can be obtained, and its accuracy is very high. Because torque is measured by torque, torque sensors are also referred to as "torque sensors".

Advantage 1: Because it is installed on the outside of the bottom bracket or directly on the bottom bracket, there are few intermediate links for the torque sensor to measure the pedaling force. Moreover, most of the pedals, cranks, and central axles are steel and metal components with extremely rigidity, and the elastic hysteresis effect is small, and the generated torque signal can change very quickly with the change of the pedaling force. The most direct result of this is that the dynamic response of electric bicycles using bilateral torque sensors is very fast. Most of the response times are milliseconds, with almost zero delay, and the power can be stepped on.

Advantage 2: If the torque sensor is installed on the outside of the bottom bracket, the standard modular design can be used, and basically all bicycles can be seamlessly installed, and there is no need to develop a special frame for it, let alone each bike. The racks are processed with high precision for the above-mentioned "rear axle hook sensor", which reduces the cost from both research and development and production.

Advantage 3: Because it is installed on the outside of the bottom bracket or on the central axle, the impact force brought by the bumps on the road is mostly buffered by the toughness and elasticity of the frame, so the impact force on the torque sensor will be It's small and the workload isn't too big. In addition, it is generally manufactured using the center axle process of bicycles. High-quality steel metal materials are excellent in hardness, strength and toughness, and have good wear resistance, so the life of the torque sensor is relatively long.

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