US 12,409,908 B2
Electric bicycle, control system of electric bicycle and control method thereof
James Darrel Cosper, New Taipei (TW); and James Raymond Cosper, New Taipei (TW)
Assigned to SUITAI ELECTRONIC LTD., New Taipei (TW)
Filed by SUITAI ELECTRONIC LTD., New Taipei (TW)
Filed on May 24, 2022, as Appl. No. 17/752,808.
Claims priority of application No. 111102832 (TW), filed on Jan. 24, 2022.
Prior Publication US 2023/0234671 A1, Jul. 27, 2023
Int. Cl. B62M 6/50 (2010.01)
CPC B62M 6/50 (2013.01) 8 Claims
OG exemplary drawing
 
1. A control system of an electric bicycle, comprising:
a pedal torque sensor configured to sense a plurality of pedal torques during a traveling period of the electric bicycle;
a micro-control circuit electrically connected to the pedal torque sensor, wherein the micro-control circuit saves a reference pedal force; wherein the micro-control circuit calculates an average pedal force based on the plurality of pedal torques and the traveling period of the electric bicycle, and generates a control signal based on a comparison result of the reference pedal force and the average pedal force;
a motor driver electrically connected to the micro-control circuit, wherein the motor driver generates a motor driving signal according to the control signal; and
a motor electrically connected to the motor driver, wherein the motor generates a motor output torque according to the motor driving signal;
wherein the micro-control circuit includes an average torque processing circuit, a subtractor and a compensation controller, the average torque processing circuit is electrically connected to the pedal torque sensor and the subtractor, the average torque processing circuit records the traveling period of the electric bicycle and generates the average pedal force according to the traveling period of the electric bicycle and the pedal torque, the subtractor subtracts the average pedal force from the reference pedal force to generate an error feedback signal, the compensation controller is a proportional-integral-derivative controller, the proportional-integral-derivative controller is electrically connected to the subtractor, and the proportional-integral-derivative controller generates a proportional gain compensation part, an integral compensation part and a differential compensation part according to the error feedback signal.