350W motor electric bicycles

Past and present life of electric power assisted bicycle（4）

For a real Electric Bicycle, Electric Bikes For Adults is only allowed to run in power assisted mode, which must be "manpower + electricity" There is no pure electric mode for the hybrid power output mode. The reason why the power assisted driving mode is only allowed is that the power assisted driving mode effectively ensures the safety and reliability of riding, greatly increases the mileage of one-time charging, effectively avoids the increase of the weight of the whole Foldable Electric Bike, and also has the dual effects of walking and key body, so that people can ride easily and further while retaining the riding experience. Therefore, the quality of "power assist system" has always been the standard to measure the level of Electric Bikes For Adults, and it is also the most competitive field among enterprises.

Yamaha used the multi-sensor control system (torque sensor) with torque sensor as the core at the beginning of developing pas (Torque sensor), also known as torque sensor or torque sensor, it can detect the output torque of manpower, and then call the power to the motor output torque to assist manpower. To judge whether a power assist system is excellent enough is the "power output torque waveform is perfect or close to the torque waveform of human output". Then, the phases of the two waveforms should be consistent as much as possible. The manpower output is large, the power output is increased accordingly, the manpower output is reduced, and the power output is also reduced accordingly. The power always changes linearly with the change of manpower in a certain proportion, so as to achieve the best power assistance when riding, and make the best use of manpower and power to make people ride easier without wasting power.

Therefore, how to improve the detection accuracy of the torque sensor, improve the response speed of the control system and make the torque of power output more linear has always been the core of the research and development of the "power assist system". At present, the top systems not only use the torque sensor, but also use the speed sensor and step frequency sensor, Therefore, the mathematical model and algorithm are more complex. Current high-level torque sensor (torque sensor) technology, corresponding multi-sensor mathematical models and algorithms are mainly in the hands of Japanese and German enterprises. Until the last two years, domestic Bafang and light passenger tsinova have developed the same level of technology, and have passed the European en15194 and en300220 standards. They can compete with Bosch and other companies in the European market, among which light passenger tsinova is also in competition with Bosch Panasonic has become a strategic partner to jointly promote the development of electric power assisted bicycles in the Chinese market.