Vehicle Heat Exchanger Ice Detection Using Capacitive Sensing
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Solution Overview
Problem
Existing heat exchange systems in electric vehicles face limitations in utilizing ambient air below 0°C due to ice formation on heat exchangers, which impedes efficient heat transfer and requires accurate detection and prediction of ice presence.
Innovation Solution
A heat exchange system incorporating a capacitive sensor unit to monitor capacitance changes on the ambient heat exchanger's surface, coupled with a control unit to adjust heat transfer based on pre-defined thresholds, enabling efficient thermal management by utilizing waste heat from the drivetrain and energy storage systems to de-ice the exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ambient air below 0°C is used as a heat source, then energy efficiency increases, but ice formation on heat exchangers occurs
Solution Approach 1:
The capacitive sensor detects ice formation at an early stage before it significantly impacts heat transfer performance. By monitoring capacitance changes in real-time, the system can take preventive action (adjusting flow rates, activating heating elements, or modifying operational parameters) before the ice buildup becomes harmful, thus allowing continuous operation in sub-freezing temperatures without compromising energy efficiency
Solution Approach 2:
The sensor provides continuous feedback on the ice formation status to the control system. This feedback loop enables dynamic adjustment of operational parameters to maintain optimal heat transfer efficiency while preventing excessive ice accumulation. The system can respond in real-time to changing conditions, balancing energy efficiency gains with ice management requirements
2Reliability
If ice detection and removal systems are added, then ice formation is managed, but system complexity increases
Solution Approach 1:
The capacitive sensor replaces complex mechanical or visual ice detection systems with an electrical field-based measurement approach. Capacitance changes provide direct, contactless measurement of ice formation without requiring mechanical probes, cameras, or complex signal processing, thus achieving reliable ice detection while minimizing added system complexity
Solution Approach 2:
The capacitive sensor unit can serve multiple functions: detecting ice formation, monitoring heat transfer efficiency, and potentially detecting other environmental conditions. This multi-functionality reduces the need for separate dedicated sensors for each parameter, thereby managing system complexity while maintaining reliable ice detection capabilities
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
Enhances heat transfer efficiency by preventing ice formation and utilizing waste heat effectively, improving thermal management and energy efficiency in vehicles.
Implementation Method 1
The capacitive sensor unit is arranged at the ambient heat exchanger unit and configured to monitor a capacitance change of a surface of the ambient heat exchanger unit exposed to the ambient air
Implementation Method 2
The ambient heat exchanger unit is configured to transfer heat between ambient air and the cooling system
Implementation Method 3
utilizing waste heat from the drivetrain and energy storage systems to de-ice the exchanger
Data Source
Figure 1
Figure 2a~2c
AI summary
The present disclosure relates to a heat exchange system for thermally conditioning a vehicle, a vehicle comprising such a heat exchange system, a method for thermally conditioning a vehicle and a computer program element for thermally conditioning a vehicle. The heat exchange system comprises a cooling system, an ambient heat exchanger unit, a capacitive sensor unit and a control unit. The cooling system is thermally couplable with a drivetrain system and/or an energy storage system of the vehicle. The ambient heat exchanger unit is thermally coupled with the cooling system. The ambient heat exchanger unit is configured to transfer heat between ambient air and the cooling system. The capacitive sensor unit is arranged at the ambient heat exchanger unit and configured to monitor a capacitance change of a surface of the ambient heat exchanger unit exposed to the ambient air. The control unit is configured to adjust the heat transfer between the ambient air and the cooling system, in case the capacitance change of the exchanger unit exceeds a pre-defined threshold for some of the conditioning that exchanger unit.