Dual-control system for electric bicycle and switching method for velocity and torque drive for electric bicycle

1 . A dual-control system for an electric bicycle, comprising:

a dual-driven algorithm controller and a bilateral single-direction signal magnetic detection torque sensor, wherein

the dual-driven algorithm controller comprises a communication module, a velocity signal acquisition module, a torque signal acquisition module and a field oriented control (FOC) motor control module;

the bilateral single-direction signal magnetic detection torque sensor comprises a bilateral torque sensor module and a single-direction cadence signal module;

the dual-driven algorithm controller is configured to receive instructions from an instrument communication signal module, interact with the bilateral single-direction signal magnetic detection torque sensor in a speed assist mode to obtain velocity signals, and then output a velocity corresponding a speed gear through the FOC motor control module, and interact with the bilateral single-direction signal magnetic detection torque sensor in a torque assist mode to obtain torque signals, and then output a torque corresponding a torque gear through the FOC motor control module; and

the bilateral single-direction signal magnetic detection torque sensor is configured to convert the twist deformation of a bottom bracket in a pedal of an electric bicycle into electrical signals;

wherein the dual-driven algorithm controller is configured to receive cadence signals from the bilateral single-direction signal magnetic detection torque sensor in a speed assist mode through the velocity signal acquisition module, and adjust a drive velocity of a motor accordingly, to achieve the speed assist mode;

wherein the dual-driven algorithm controller is configured to receive trampling pressure signals from the bilateral single-direction signal magnetic detection torque sensor through the torque signal acquisition module in a torque assist mode and adjust an output torque of a motor accordingly, to adapt to different riding strength requirements;

wherein the cadence signals comprises a trampling direction and a trampling frequency of a rider.

2 . The dual-control system for an electric bicycle according to claim 1 , wherein the bilateral single-direction signal magnetic detection torque sensor outputs different pulse signals according to a frequency difference when a pedal rotates forward, while it does not output pulse signals when the pedal is reversed, to improve the accuracy of the riding direction determination.

3 . The dual-control system for an electric bicycle according to claim 1 , wherein the bilateral single-direction signal magnetic detection torque sensor is configured with 36 magnetic poles.

4 . A switching method for velocity and torque drive for an electric bicycle, comprising the following configurations and methods:

a) sending instructions to a dual-driven algorithm controller through an instrument communication signal module, and selecting a speed assist mode or a torque assist mode;

b) obtaining, in a speed assist mode, cadence signals of an electric bicycle by a bilateral single-direction signal magnetic detection torque sensor, determining a trampling direction and a trampling frequency of a rider through the cadence signals by the dual-driven algorithm controller, and finally, driving a motor to output a velocity corresponding a speed gear through an FOC motor control module; and

c) obtaining, in a torque assist mode, trampling pressure signals of the electric bicycle by the bilateral single-direction signal magnetic detection torque sensor, determining a trampling force of the rider through the trampling pressure signals by the dual-driven algorithm controller, and finally driving the motor to output a torque corresponding a torque gear through the FOC motor control module.

5 . The switching method for velocity and torque drive for an electric bicycle according to claim 4 , wherein the instrument communication signal module may selectively provide several velocity or torque selection signals for different gears.