Dual-Evaporator Refrigerant Circulation with Compressor Load Control
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Solution Overview
Problem
In electric vehicles and hybrid vehicles, the electric compressor used for both vehicle interior and on-vehicle battery cooling faces increased load and temperature issues, leading to potential overheating of the electronic control equipment, which can compromise the compressor's performance and occupant comfort.
Innovation Solution
The solution involves controlling the operation of the evaporator for on-vehicle battery cooling, using an internal-external air switching unit, reducing the rotational rate of blower fans, and increasing the rotational rate of the condenser fan to manage the load on the electric compressor, while maintaining air conditioning performance through a temperature and pressure detection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric compressor is used for both vehicle interior cooling and on-vehicle battery cooling, then the air conditioning performance for both purposes is improved, but the temperature of the electric compressor increases excessively
Solution Approach 1:
The patent dynamically adjusts the operational parameters of the evaporator for on-vehicle battery cooling based on real-time temperature and pressure conditions. By making the evaporator's operation flexible and adaptive rather than fixed, the system can reduce compressor load when temperatures are high while maintaining cooling effectiveness when conditions permit, thus resolving the contradiction between maintaining air conditioning performance and preventing compressor overheating
Solution Approach 2:
The patent changes operational parameters (temperature thresholds and pressure levels) to control the evaporator's operation. By monitoring and adjusting these parameters, the system optimizes the balance between providing adequate cooling for both the vehicle interior and battery while preventing the compressor from operating at excessively high temperatures
2Power
If the load on the electric compressor is increased to meet cooling demands, then the cooling capacity is improved, but the temperature of the electronic equipment for control increases
Solution Approach 1:
The patent implements a feedback control mechanism that monitors the temperature and pressure conditions in real-time and uses this information to adjust the evaporator's operation. This closed-loop feedback system allows the compressor to operate at optimal load levels, providing sufficient cooling capacity while preventing excessive temperature rise in the electronic control equipment by reducing load when temperature thresholds are approached
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 effectively reduces the load on the electric compressor, suppresses its temperature, and maintains comfort and performance, thereby protecting the compressor and ensuring effective air conditioning for both interior and battery cooling.
Implementation Method 1
Increase in temperature of the electric compressor is suppressed to some extent by a refrigerant passing through the electric compressor
Implementation Method 2
an evaporator for cooling an on-vehicle battery together with an evaporator for cooling an vehicle interior in a refrigerant circulation passage
Data Source
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AI summary
Provided are an evaporator unit for vehicle-interior air conditioning 2 for cooling an interior of a vehicle, an evaporator unit for on-vehicle battery cooling 3 including an evaporator for on-vehicle battery cooling 32 for cooling an on-vehicle battery mounted on the vehicle; an electric compressor 5 for compressing and supplying a refrigerant to the evaporator unit for vehicle-interior air conditioning 2 and the evaporator unit for on-vehicle battery cooling 3; a temperature sensor 41 for detecting an inner temperature of the electric compressor 5; a pressure sensor 42 for detecting a pressure of the refrigerant compressed by the electric compressor 5; and an air-conditioning control unit 40 for restricting operation of the evaporator for on-vehicle battery cooling 32 so as to reduce load on the electric compressor 5 based on the inner temperature of the electric compressor 5 and the pressure of the refrigerant.