Control Unit for Electric Bicycle Gear Shifting
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Solution Overview
Problem
Existing control units for vehicles and bicycles with electric drive assistance fail to ensure low wear, rapid gear changes, minimal power transmission interruptions, low noise during shifting, reduced accident risk, high driving comfort, and overall efficiency.
Innovation Solution
A control unit that coordinates the switching of a mechanical drive unit and an electric drive unit based on sensor-measured variables, optimizing torque conversion and shifting timing to minimize transmission load and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gear switching is performed during operation, then gear ratio adjustment is achieved, but transmission wear increases and shifting speed decreases
Solution Approach 1:
The control unit determines optimal switching times in advance by analyzing measured variables such as position, speed, and torque. The switching command is generated before the actual switching event, allowing the transmission to be prepared for gear change at the optimal moment, thereby minimizing wear and maximizing shifting speed.
Solution Approach 2:
The system continuously monitors measured variables (position, speed, torque) and uses this feedback to dynamically adjust switching timing. This closed-loop control ensures that gear switching occurs at the optimal moment based on real-time transmission state, reducing wear while maintaining adaptability.
2Adaptability or versatility
If gear switching is performed during operation, then gear ratio adjustment is achieved, but power transmission interruption increases
Solution Approach 1:
The control unit calculates and prepares switching commands in advance based on predicted optimal switching times. By determining the switching moment before power transmission interruption occurs, the system minimizes the duration of power loss while achieving necessary gear ratio adjustments.
Solution Approach 2:
The control unit continuously monitors transmission state and maintains optimal power transmission by timing gear switches to occur at moments when torque demand is minimized. This continuous control approach ensures that power transmission interruption is reduced to the absolute minimum necessary for gear changing.
3Adaptability or versatility
If gear switching is performed during operation, then gear ratio adjustment is achieved, but noise level increases
Solution Approach 1:
The control unit determines optimal switching times in advance by analyzing measured variables such as position, speed, and torque. The switching command is generated before the actual switching event, allowing the transmission to be prepared for gear change at the optimal moment, thereby minimizing wear and maximizing shifting speed.
Solution Approach 2:
The system continuously monitors measured variables (position, speed, torque) and uses this feedback to dynamically adjust switching timing. This closed-loop control ensures that gear switching occurs at the optimal moment based on real-time transmission state, reducing wear while maintaining adaptability.
4Ease of operation
If switching means is controlled without coordination, then switching operation is simple, but gear changing speed decreases
Solution Approach 1:
The control unit merges the control of switching means with the control of electric drive unit into a single coordinated system. By combining these control functions, the system achieves fast gear changing through centralized optimization while maintaining operational simplicity through automated decision-making based on measured variables.
Solution Approach 2:
The system continuously monitors measured variables (position, speed, torque) and uses this feedback to dynamically adjust switching timing. This closed-loop control ensures that gear switching occurs at the optimal moment based on real-time transmission state, reducing wear while maintaining adaptability.
Data Source
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AI summary
A control unit (5) for use in a means of transport (100) powered by a driver is specified, wherein the means of transport (100) comprises an electric drive unit (1), a mechanical drive unit (10) operated by muscle power and at least one transmission (3) switchable by at least one switching means (4), wherein the control unit (5) is configured to control the switching means (4) and the electric drive unit (1), wherein the switchable transmission (3) is configured to convert a first torque (12) applied by the driver to the mechanical drive unit (10) into a second torque (13), and wherein the means of transport (100) is movable under the influence of the second torque (13) and a third torque (15) applied by the electric drive unit (1).