Multi-Evaporator Vehicle AC Compressor Control Under Fluctuating Loads
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Solution Overview
Problem
Air conditioners for vehicles with multiple evaporators face challenges in maintaining appropriate temperature control due to fluctuating loads, leading to insufficient cooling capacity and failure to achieve target temperatures.
Innovation Solution
An air conditioner system with a control device that calculates the maximum required compressor revolutions for each evaporator and adjusts valve devices to optimize refrigerant flow, using feedback and feedforward calculations to ensure effective temperature control and prevent unnecessary processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressor number of revolutions is controlled based on the temperature of one evaporator, then the temperature control of that evaporator is improved, but the cooling capacity for other evaporators becomes insufficient
Solution Approach 1:
The control system segments the calculation of compressor revolutions by evaluating each evaporator's requirements independently. The control device calculates the target number of revolutions for each evaporator separately based on its specific temperature requirements and load conditions, then selects the maximum value to ensure all evaporators receive adequate cooling capacity.
Solution Approach 2:
The system dynamically adjusts the compressor operation by continuously monitoring temperature conditions of multiple evaporators and recalculating the required compressor revolutions. The control device selects the maximum target revolutions from multiple evaporators in real-time, enabling the system to adapt to fluctuating loads and maintain appropriate temperature control across all evaporators.
2Use of energy by moving object
If the compressor number of revolutions is reduced to control one evaporator's temperature, then energy consumption is reduced, but the cooling capacity becomes insufficient for high-load conditions
Solution Approach 1:
The control device implements feedback control by continuously monitoring the temperature of each evaporator and adjusting the compressor revolutions accordingly. The system calculates target revolutions based on actual temperature conditions and selects the maximum value to ensure adequate cooling capacity while avoiding excessive energy consumption when full capacity is not needed.
Solution Approach 2:
The system changes the operational parameters of the compressor by adjusting the number of revolutions based on calculated requirements from multiple evaporators. By selecting the maximum target revolutions from different evaporators' requirements, the system optimizes the balance between energy consumption and cooling capacity adequacy.
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 consistent and appropriate temperature control across multiple evaporators, preventing cooling capacity shortages and extending battery life by maintaining optimal refrigerant circulation and flow.
Implementation Method 1
a compressor (2) to compress a refrigerant
Implementation Method 2
a plurality of evaporators (9, 64) to evaporate the refrigerant
Implementation Method 3
a plurality of evaporators (9, 64) to evaporate the refrigerant
Implementation Method 4
a heat exchanger (evaporator) for a temperature-controlled object to cool a battery
Data Source
AI summary
An air conditioner for a vehicle is provided which can realize suitable temperature control when having a plurality of evaporators even if the load in each evaporator fluctuates. An air conditioner 1 for a vehicle includes at least a compressor 2, a heat absorber 9 to evaporate a refrigerant, a refrigerant-heat medium heat exchanger 64, and a control device 11, and conditions air of a vehicle interior. The control device 11 calculates target numbers of revolutions TGNCc and TGNCcb of the compressor 2 required to control the temperature of the heat absorber 9 and the temperature of a heat medium cooled by the refrigerant-heat medium heat exchanger 64, respectively, and selects the maximum value of them to control the operation of the compressor 2.