Electric Bicycle Torque Control via Speed-Adaptive Period
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Solution Overview
Problem
Current power-assisted electric bicycles often provide power assistance that is not in line with the user's pedaling experience, leading to reduced user willingness to use them.
Innovation Solution
A power-assisted electric bicycle system that includes a torque sensor, a motor, and a controller, which receives torque signals from the sensor, computes a period based on the bicycle's speed, and sets a torque output for the motor based on the maximum torque values within that period, ensuring dynamic adjustment of power assistance to match the user's pedaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power assistance control methods are used, then the system structure is simple, but the power assistance does not match the user's pedaling experience
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously receives torque signals from the torque sensor, computes the maximum torque value within a determined period, and adjusts the motor torque output accordingly. This closed-loop feedback system ensures the power assistance accurately matches the user's pedaling effort by constantly monitoring and responding to actual torque input, thereby resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The system employs self-service by automatically determining the assistance period based on the bicycle's speed and autonomously computing the maximum torque value within that period without requiring manual intervention. The controller independently adjusts the motor output based on the detected torque signals, enabling the system to self-regulate and match power assistance to user pedaling experience, thus improving measurement precision while maintaining reasonable device complexity.
2Ease of operation
If real-time torque adjustment is implemented, then the power assistance matches pedaling experience, but the response time and computational requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-determining the assistance period based on the bicycle's speed before computing the maximum torque value. The controller calculates the period T = V/MaxV (where V is current speed and MaxV is maximum speed) and uses this predetermined period to efficiently search for the maximum torque value in the torque signal history. This preliminary determination of the time window reduces computational complexity and processing time while maintaining real-time responsiveness to user pedaling.
Data Source
AI summary
The present disclosure provides a power assisted electric bicycle, a transmission device and a control method. The power assisted electric bicycle includes a body, a wheel, a torque sensor, a motor and a controller. The torque sensor is configured to output a plurality of torque signals corresponding to a pedal force. The controller is configured to: receive the torque signals from the torque sensor; compute and determine a first period according to a speed of the power assisted electric bicycle at a first time point; obtain a first maximum value of the torque signals in the first period that ends at the first time point; and, set a first torque output of the motor according to the first maximum value corresponding to the torque signal.