E-MTB Drive Control for Rocky Terrain Stability
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Solution Overview
Problem
Existing control systems for electric mountain bikes (EMTBs) struggle to provide continuous propulsion in challenging terrain, leading to jerky movements and reduced rider safety and enjoyment.
Innovation Solution
A system that uses sensors to recognize special driving situations, such as stony terrain, and extends the operation of the additional drive even when normal pedal control is limited, ensuring continuous propulsion and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive is controlled to provide propulsion only when the rotary movement variable exceeds a threshold value, then the drive avoids unnecessary activation during insignificant pedaling or pushing, but it fails to provide continuous propulsion when the rider holds pedals horizontally on rocky terrain
Solution Approach 1:
The control unit stores a reference value representing typical pedal movement during normal riding. When detecting horizontal pedal positioning on rocky terrain, the system compares current pedal position against this pre-stored reference to determine whether to extend propulsion, enabling proactive support before the rider experiences propulsion interruption
Solution Approach 2:
The system continuously monitors the rotary movement variable and pedal position, comparing real-time data against stored reference values. This feedback mechanism allows the control unit to detect deviations indicating rocky terrain conditions and adjust propulsion accordingly, maintaining riding continuity while preventing false activation
2Adaptability or versatility
If the drive provides brief assistance during short pedal impulses on rocky terrain, then the drive responds to rider input, but it generates jerky movements that can cause falls and reduce rider enjoyment
Solution Approach 1:
When the control unit detects horizontal pedal positioning indicative of rocky terrain, it extends the propulsion duration beyond the brief pedal impulse. The drive continues providing power assistance for a predefined period after the pedal impulse ends, ensuring continuous rather than jerky propulsion and maintaining riding stability
Solution Approach 2:
The system dynamically adjusts propulsion duration based on detected riding conditions. During normal terrain, propulsion matches pedal impulse duration, but during detected rocky terrain conditions with horizontal pedal positioning, the system extends propulsion duration to provide smooth, continuous support
Data Source
Figure 1a~1d
Figure 2a~3c
Figure 4
AI summary
The invention relates to a method, to a device and to a pedal-operated vehicle, which recognises a particular driving situation and as a result operates the additional drive located on the vehicle for longer compared to a normal driving situation without the need for a rotational movement of the pedal to be correspondingly detected by the driver.