Crank torque sensing device and detection method thereof

Abstract

The invention discloses a crank torsion sensing device and a crank torsion detection method. The crank torsion sensing device is arranged at a five-way shaft of a power-assisted electric vehicle; a backward pull is generated at the pivot of the five-way shaft through a reacting force borne by a chain driven by a big fluted disc when a pedal is treaded, and the torsion value generated when the pedal is treaded can be acquired by measuring the magnitude of the backward pull; and the magnitude of the backward pull borne by the five-way shaft is acquired on the basis of the similar principle of a spring platform scale, by measuring the displacement of the five-way shaft and according to the set elasticity coefficient and the deformation of a spring. The displacement generated by the five-way shaft due to stress enables a detector to generate a voltage or current signal, the electric signal is used as a sensing control signal, and the control signal can determine the magnitude of the driving power, so that the purpose of power-assisted drive is fulfilled.

Description

technical field [0001] The present invention relates to a crank torque sensing device and its detection method, especially a device capable of detecting the magnitude of the torque generated by the pedaling force of a power-assisted electric vehicle during riding or measuring the magnitude of the pedaling torque during exercise. This detection can control the electric motor to output appropriate auxiliary power or calculate the energy consumed during motion. Background technique [0002] At present, the transmission system of power-assisted electric vehicles mostly includes an electric motor that provides auxiliary power. The power of the motor and the rider's pedaling force will be integrated together to drive the power-assisted electric vehicle forward, which can save the rider The purpose of physical strength, and can adjust the output power of the motor according to the condition of the road surface. In order to achieve this purpose, a pedal force sensing mechanism can ...

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Problems solved by technology

[0005] However, the cost of the above-mentioned planetary bevel gear set mechanism is not low, and it needs to use a lot of transmission parts to form a rather complicated mechanism, such as the Chinese TW invention patent No. 88114867 (combination of torque detector for bicycle and crankshaft connecting part for bicycle) Body), although the torque detection function has been integrated into the relevant mechanism of the bottom bracket, but this invention needs to use four sets of pressure detectors to sense the torque generated when pedaling the bicycle, plus the relevant zero Component processing is precise and complex, and there is still room for improvement in the assembly process

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