Vehicle Battery Cooling Control Using Temperature Rise Gradient
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Solution Overview
Problem
Conventional vehicle air conditioning devices for electric vehicles struggle with accurately judging the need for temperature regulation of batteries, leading to inefficient energy use and potential battery malfunction due to large temperature fluctuations and unnecessary energy consumption.
Innovation Solution
A vehicle air conditioning device with a control system that adjusts the temperature of batteries based on the gradient of temperature change, starting cooling when the rise rate exceeds a predetermined value and stopping when the cooling capacity drops below a certain threshold, while considering outdoor air temperature and charging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature regulation is performed based on predetermined threshold values, then the temperature control system is simple to implement, but the temperature fluctuation width becomes large and energy is wasted due to unnecessary regulation
Solution Approach 1:
The patent changes the control parameter from absolute temperature threshold to temperature change rate (gradient). The control device calculates the rate of temperature change and compares it with a predetermined threshold, enabling more precise control that responds to actual temperature trends rather than fixed thresholds, thereby reducing unnecessary energy consumption while maintaining system simplicity
Solution Approach 2:
The patent implements feedback control by continuously monitoring the temperature change rate and adjusting the cooling system operation accordingly. The control device uses the calculated temperature gradient to determine when to start and stop cooling, creating a closed-loop system that adapts to real-time temperature variations and prevents both overheating and unnecessary energy use
2Reliability
If temperature regulation is performed continuously to maintain stable temperature, then battery reliability is improved, but energy consumption increases unnecessarily when temperature is already stable
Solution Approach 1:
The patent applies dynamic control by adjusting the cooling system operation based on the real-time temperature change rate rather than maintaining continuous operation. The control device dynamically determines the need for cooling by calculating how quickly the temperature is changing, enabling the system to provide protection when needed while avoiding unnecessary energy consumption during stable temperature periods
Solution Approach 2:
The patent performs preliminary assessment by calculating the temperature change rate before initiating cooling. This allows the system to predict temperature trends and take preventive action only when the rate of change indicates potential overheating, rather than continuously running the cooling system, thus maintaining battery reliability while reducing energy waste
3Stability of the object's composition
If the refrigerant for battery temperature regulation is circulated continuously, then the battery temperature is maintained within threshold values, but the temperature fluctuation width becomes large and regulation precision is reduced
Solution Approach 1:
The patent changes the control parameter from absolute temperature to temperature change rate, enabling more precise regulation. By monitoring how quickly temperature is changing rather than just the absolute value, the system can detect early temperature trends and adjust cooling accordingly, reducing temperature fluctuation width and improving regulation precision while maintaining stability
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 accurately judges the need for temperature regulation, reducing energy waste and preventing battery malfunctions by optimizing cooling and heating operations based on real-time temperature changes and environmental conditions.
Implementation Method 1
a compressor (2) to compress a refrigerant
Implementation Method 2
an indoor heat exchanger to perform exchange of heat between air supplied to the vehicle interior and the refrigerant
Implementation Method 3
an outdoor heat exchanger disposed outside the vehicle interior
Implementation Method 4
a refrigerant for the battery (heat medium) that exchanges heat with a refrigerant circulating in a refrigerant circuit to be circulated in the battery
Data Source
AI summary
A vehicle air conditioning device is provided which is capable of accurately judging the need for temperature regulation of an object of temperature regulation mounted in a vehicle and efficiently performing temperature regulation. A compressor 2 to compress a refrigerant, an indoor heat exchanger (radiator 4 and heat absorber 9) for exchanging heat between air supplied to a vehicle interior and the refrigerant, an outdoor heat exchanger 7 disposed outside the vehicle interior, and a control device 11 are provided to perform air conditioning of the vehicle interior. An equipment temperature adjusting device 61 for adjusting the temperature of the object of temperature regulation mounted in the vehicle is provided. The control device controls the equipment temperature adjusting device 61 on the basis of a gradient (ΔTw) of a change in an index indicating the temperature of the object of temperature regulation.