Pedelec Assist Level Adjustment via Torque Thresholds
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Solution Overview
Problem
Pedelecs have complex assist level adjustments that require riders to know about gear transmission, leading to discomfort due to inadequate assist levels, as riders often neglect current speed and pedal force during manual adjustments.
Innovation Solution
A method for automatically adjusting the assist level of a pedelec based on current speed, pedal cadence, and torque, using sensors and a processing unit to compare torque indices with predetermined thresholds to switch between assist levels, ensuring comfortable riding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of assist level is provided, then rider can adjust assist level according to road conditions, but rider has to know about gear transmission which increases manipulation complexity and loading in study
Solution Approach 1:
The system automatically adjusts the assist level without requiring rider intervention or knowledge of gear transmission. The control unit autonomously monitors pedal torque, speed, and cadence to determine optimal assist levels, making the system self-regulating and eliminating the need for rider education on complex transmission mechanisms
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated electronic control system. Sensors detect riding parameters and transmit data to a control unit that electronically adjusts motor assist levels, substituting the need for rider understanding of mechanical gear transmission with an automated electro-mechanical system
2Adaptability or versatility
If manual adjustment of assist level is provided, then rider can adjust assist level, but rider often neglects current assist level, speed, and pedal force which leads to discomfort due to void pedaling or inadequate assist level
Solution Approach 1:
The system continuously monitors pedal torque, speed, and cadence through sensors and uses this feedback to dynamically adjust assist levels. The control unit receives real-time data from sensors and automatically modifies motor output to maintain optimal riding conditions, ensuring consistent comfort without relying on rider memory or awareness of previous settings
Solution Approach 2:
The system proactively adjusts assist levels based on predicted riding conditions by continuously analyzing current parameters before discomfort occurs. By monitoring trends in pedal torque and speed, the control unit anticipates needed adjustments and applies them in advance, preventing void pedaling or inadequate assist rather than reacting after discomfort has occurred
3Adaptability or versatility
If multiple assist levels are provided, then rider can choose appropriate assist level, but system becomes complex requiring knowledge of gear transmission
Solution Approach 1:
The control unit automatically selects from multiple assist levels based on real-time riding conditions without requiring rider knowledge of the transmission system. The system self-determines the optimal assist level by analyzing sensor data, making the complexity of multiple levels invisible to the user while maintaining adaptability
Solution Approach 2:
The system manages multiple assist levels by dynamically changing operational parameters based on detected conditions. Rather than requiring rider knowledge of discrete gear transmission levels, the system continuously adjusts motor output parameters (torque, power) based on real-time measurements of pedal force, speed, and cadence, transforming a discrete complex system into a continuous adaptive one
Data Source
AI summary
A method for automatic adjustment of a pedelec having a first assist level and a second assist level includes the following steps. The pedelec is operated at an initial assist level. A pedal torque index is measured and compared with a predetermined numeric section having an upper threshold and a lower threshold. If the pedal torque index is within the predetermined numeric section, the pedelec is kept in operating at the initial assist level. If the pedal torque index is lower than the lower threshold, the pedelec is adjusted to operate at the second assist level. If the pedal torque index is higher than the upper threshold, the pedelec is adjusted to operate at the first assist level. Therein, auxiliary force provided by the pedelec at the second assist level is less than auxiliary force provided by the pedelec at the first assist level.