One-Wheeled Vehicle Dismount Control During Reverse Motion

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Solution Overview

Problem

Existing control systems for self-balancing electric vehicles, such as one-wheeled skateboards, lack effective methods for safe and intuitive dismounting, particularly when reversing, as they continue to balance and propel the vehicle even when the rider is dismounting, potentially leading to unexpected motion.

Innovation Solution

The implementation of a control system that adjusts the balance angle offset or proportional gain parameter based on the direction of wheel rotation, disengaging the hub motor when a threshold is reached, allowing the rider to safely dismount by leaning backward and stopping the vehicle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the control system continues automatic balancing when the rider is dismounting, then the vehicle maintains self-balancing capability, but the rider safety is compromised due to unexpected motion

Engineering Contradiction:

Improveself-balancing capabilityVSAvoidunexpected motion during dismount

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The control system performs preliminary detection of dismount conditions (frame orientation exceeding threshold, reverse direction detection) before the actual dismount occurs. When these conditions are detected, the system proactively disengages the hub motor and disables automatic balancing, preventing unexpected motion during the dismount process while maintaining safety.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the hub motor remains engaged during reverse motion, then the vehicle can be controlled, but the dismounting process becomes unsafe and non-intuitive

Engineering Contradiction:

Improvedismounting processVSAvoidvehicle control

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The control system dynamically adjusts its behavior based on the vehicle's operational state. When reverse motion is detected (indicating dismount intent), the system automatically disengages the hub motor and transitions from active control mode to a passive state, making the dismounting process safe and intuitive while maintaining vehicle control during normal operation.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If the control system automatically disables balancing when reversing, then rider safety is improved, but the vehicle functionality is reduced

Engineering Contradiction:

Improveunexpected motionVSAvoidvehicle functionality

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The control system applies partial disabling of automatic balancing only during the specific condition of reverse motion detection, rather than completely disabling the function. This selective approach prevents unexpected motion during dismounting while preserving full automatic balancing functionality during normal forward operation, maintaining vehicle versatility.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12194860B2Dismount controls for one-wheeled vehicle

Publication Date: 2025.01.14 FUTURE MOTION INC

AI summary

A control system for a tiltable vehicle may include a motor controller configured to respond to backward or reverse operation of the vehicle by hindering a responsiveness of the control system (e.g., proportionally) and/or eventually disengaging a drive motor of the vehicle. Accordingly, a user may intuitively and safely dismount the vehicle by selectively commanding reverse operation. In some examples, the backward direction may be user-defined.