Pedelec Bottom Bracket Drive With Ambient-Aware Thermal Control
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Solution Overview
Problem
Existing pedelec bottom bracket drives face challenges in effectively managing housing temperature to prevent skin burns, as previous temperature control schemes either intervene too late, leading to sudden loss of motor drive energy or conserve energy unnecessarily by intervening too early.
Innovation Solution
An electric pedelec bottom bracket drive with a housing temperature control module that adjusts maximum electrical drive energy based on ambient air temperature, using sensors to detect housing and ambient temperatures, and considering factors like bicycle speed and altitude profile to dynamically manage energy delivery and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conservatively designed control scheme intervenes with restraint at relatively low housing temperatures, then skin burn prevention is ensured, but supporting motor drive energy is squandered
Solution Approach 1:
The control scheme dynamically adjusts the intervention threshold based on ambient temperature conditions. At low ambient temperatures, the system intervenes at higher housing temperatures to preserve motor drive energy, while at high ambient temperatures, it intervenes at lower temperatures to prevent skin burns. This dynamic adaptation resolves the contradiction by making the control strategy context-dependent rather than fixed.
Solution Approach 2:
The system changes the temperature parameter thresholds for control intervention based on ambient temperature conditions. The housing temperature threshold for intervention is adjusted as a function of ambient temperature, allowing the system to optimize between energy preservation and skin burn prevention by modifying the operational parameters according to environmental conditions.
2Loss of energy
If a sporting control scheme intervenes shortly before the limit temperature is reached, then motor drive energy is preserved, but the housing temperature reaches the limit temperature causing sudden loss of drive energy
Solution Approach 1:
The system takes preliminary action by reducing motor drive energy before the housing temperature reaches the critical limit. By anticipating the temperature rise and proactively reducing power output in advance, the system prevents the sudden loss of drive energy while maintaining reliable operation throughout the riding experience.
Solution Approach 2:
The control system continuously monitors housing temperature and uses this feedback to adjust motor drive energy in real-time. This closed-loop control allows the system to respond to actual temperature conditions, preserving energy while preventing the housing temperature from reaching levels that would cause sudden drive energy loss.
3Object-affected harmful factors
If the housing temperature is strictly limited to prevent skin burns, then safety is ensured, but motor drive energy is unnecessarily restricted
Solution Approach 1:
The system changes the temperature threshold parameter for control intervention based on ambient temperature conditions. At low ambient temperatures where cooling is more effective, the system allows higher housing temperatures before intervention, thereby preserving motor drive energy. At high ambient temperatures, it lowers the intervention threshold to maintain safety. This parameter adaptation resolves the contradiction between safety and energy utilization.
Solution Approach 2:
The control strategy transitions from a static temperature threshold to a dynamic threshold that adapts to ambient temperature conditions. This dynamic approach allows the system to optimize the balance between skin burn prevention and motor drive energy utilization by adjusting the intervention point according to environmental factors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures that maximum electrical drive energy is available when needed, particularly at low ambient temperatures, while preventing overheating, thus enhancing the riding experience by avoiding sudden energy loss and maintaining efficient motor support.
Implementation Method 1
a housing temperature sensor which is thermally associated with the drive unit housing and which is configured to measure a housing temperature
Implementation Method 2
The ambient temperature detector is arranged outside of the drive unit housing and is connected to the housing temperature control module. The ambient temperature detector is configured to detect an air temperature outside the drive unit housing.
Implementation Method 3
The housing temperature control module is configured to limit a maximum electrical drive energy as a function of the air temperature when the housing temperature measured by the housing temperature sensor is above a control intervention limit temperature which is below the housing limit temperature.
Data Source
AI summary
An electric pedelec bottom bracket drive includes a drive unit, a drive controller, and an ambient temperature detector. The drive unit includes a drive unit housing, a drive motor arranged therein, and a housing temperature sensor which measures a housing temperature. The drive controller supplies electrical drive energy to the drive motor and includes a housing temperature control module which is connected to the housing temperature sensor and which controls an electrical drive energy to not exceed a housing limit temperature. The ambient temperature detector is arranged to detect an air temperature outside of the drive unit housing and is connected to the housing temperature control module. The housing temperature control module limits a maximum electrical drive energy as a function of the air temperature when the housing temperature measured by the housing temperature sensor is above a control intervention limit temperature which is below the housing limit temperature.