Chainless E-Bike Pedal Torque Warning for Collision Risk

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Solution Overview

Problem

Chainless electric bicycles lack effective systems to predict and prevent collisions with rear and side-rear objects, posing a safety risk.

Innovation Solution

A collision risk warning system for chainless electric bicycles that includes a reaction motor on the pedal to adjust torque based on detected object approach distances, using sensors to determine and adjust pedal load to notify the user of potential collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a chainless electric bicycle uses a reaction motor to provide basic reaction torque according to pedal rotation, then the pedal feeling is improved to match regular bicycles, but the system cannot notify users of collision risks with rear and side-rear objects

Engineering Contradiction:

Improvepedal feelingVSAvoidcollision risk notification

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The reaction motor is designed to perform multiple functions: it provides basic reaction torque to simulate chain resistance for natural pedal feeling, and simultaneously serves as a notification device by varying its torque output to alert users of collision risks detected by sensors. This multi-functionality resolves the contradiction by making the existing pedal mechanism also responsible for safety notification.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system changes the torque parameter of the reaction motor dynamically based on sensor input. When objects are detected in rear or side-rear areas, the controller varies the reaction torque from its basic value to create a noticeable pedal resistance change, alerting the user to potential collision risks while maintaining the fundamental pedal feeling mechanism.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the reaction motor varies torque frequently to notify collision risks, then safety notification is improved, but the pedal feeling becomes unstable and unnatural

Engineering Contradiction:

Improvecollision risk notificationVSAvoidpedal feeling stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The system implements dynamic torque adjustment with temporal consideration. The controller varies reaction torque only when objects are detected in specific zones (rear or side-rear areas), and maintains stable basic torque when no risks are present. This dynamic approach ensures notification occurs only when necessary, preserving pedal feeling stability during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses sensor feedback to determine when torque variation is appropriate. Collision risk notification through torque variation is triggered only when sensors detect objects in hazardous zones, creating a feedback-based control mechanism that balances notification effectiveness with pedal feeling stability by acting only when needed.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4497668B1Device and method for collision risk warning of chainless electric bicycle

Publication Date: 2025.10.01 HL MANDO CORP

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AI summary

There may provide a device and method for a collision risk warning of a chainless electric bicycle. More specifically, there may provide a device and method for a collision risk warning of a chainless electric bicycle capable of notifying a collision risk situation based on the load condition when the user pedals.