EV Air Conditioning Control with Active Air Flap Feedback
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Solution Overview
Problem
In electrified vehicles, when the active air flap is closed, air resistance decreases, but cooling efficiency decreases, leading to increased refrigerant pressure and power consumption of the electric compressor, which affects fuel and electrical efficiency.
Innovation Solution
A method and device that use a controller to determine the operation of the active air flap and electric compressor, increasing internal circulating air by adjusting the intake door when the flap is closed, thereby reducing the compressor speed and power consumption, and terminating the method if refrigerant pressure falls below a reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the active air flap is closed to reduce air resistance, then fuel efficiency is improved, but cooling efficiency decreases and power consumption of the electric compressor increases
Solution Approach 1:
The system changes the operating parameters of the air conditioning device by adjusting the intake door opening degree and compressor speed based on the active air flap state. When the active air flap is closed, the intake door opening degree is increased to compensate for reduced cooling efficiency, and compressor speed is adjusted to optimize power consumption while maintaining cooling performance.
Solution Approach 2:
The controller continuously monitors the state of the active air flap and adjusts the intake door opening degree and compressor speed accordingly. This feedback mechanism ensures that the air conditioning system adapts to changing conditions, maintaining optimal cooling efficiency and power consumption based on the current operational state.
2Temperature
If the intake door opening degree is increased to improve cooling efficiency, then cooling performance is improved, but power consumption of the electric compressor increases
Solution Approach 1:
The system optimizes the balance between cooling efficiency and power consumption by dynamically adjusting two parameters simultaneously: the intake door opening degree (affecting cooling efficiency) and the compressor speed (affecting power consumption). This dual parameter adjustment allows the system to maintain cooling performance while minimizing energy usage.
Solution Approach 2:
The system transitions from static control to dynamic control by continuously adjusting the intake door opening degree and compressor speed based on real-time conditions. This dynamic adjustment allows the system to respond to changing thermal loads and environmental conditions, optimizing both cooling efficiency and power consumption throughout operation.
3Use of energy by moving object
If the speed of the electric compressor is decreased to reduce power consumption, then electrical efficiency is improved, but cooling efficiency decreases
Solution Approach 1:
The system compensates for the decrease in compressor speed by adjusting the intake door opening degree. When compressor speed is reduced to save energy, the intake door opening degree is increased to maintain adequate cooling efficiency, ensuring that the overall cooling performance remains sufficient while reducing power consumption.
Solution Approach 2:
The intake door serves multiple functions: it controls the amount of ambient air entering the evaporator for cooling, and it also compensates for reduced compressor performance. By adjusting the intake door opening degree, the system can maintain cooling efficiency even when compressor speed is reduced, making the overall system more versatile in achieving both energy savings and cooling performance.
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 approach improves fuel and electrical efficiency by reducing power consumption of the electric compressor when the active air flap is closed, maintaining optimal cooling efficiency while minimizing energy use.
Implementation Method 1
an electric compressor provided in an air conditioner of the air conditioning device
Implementation Method 2
a condenser of the air conditioner that condenses the refrigerant transferred from the electric compressor
Implementation Method 3
cool a condenser of an air conditioner condensing a refrigerant
Implementation Method 4
an active air flap provided at a front side of the electrified vehicle and configured to, by being opened, cool a condenser
Data Source
AI summary
A method for controlling an air conditioning device of an electrified vehicle includes determining, by a controller, whether an active air flap is closed in response to an operation signal of the active air flap of the electrified vehicle, when an electric compressor provided in an air conditioner of the air conditioning device of the electrified vehicle is operated, when the active air flap is closed, controlling, by the controller, opening of an intake door provided in the air conditioning device to increase an amount of internal circulating air of the air conditioner, and when the amount of the internal circulating air of the air conditioner is increased, decreasing, by the controller, a speed of the electric compressor.