Vehicle AC Compressor Control With Fewer Sensors and Stable Cooling
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Solution Overview
Problem
Conventional air conditioning systems for vehicles with variable capacity compressors face challenges in controlling fuel consumption and providing a stable, pleasant interior environment due to complex structures, excessive sensor inputs, and unstable temperature control, often resulting in inefficient fuel use and operational fluctuations.
Innovation Solution
A method that optimizes compressor discharge capacity by setting target temperatures based on user input, vehicle and solar radiation data, calculating target discharge and evaporator temperatures, and adjusting the opening degree of the temperature control door to maintain a temperature difference within a specific acceptable range, thereby controlling compressor output and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional air conditioning systems use multiple sensors and complex control structures to manage variable capacity compressors, then temperature control capability is improved, but device complexity and fuel consumption increase
Solution Approach 1:
The patent extracts and eliminates unnecessary sensors and control elements from the conventional system. Specifically, it removes the need for multiple temperature sensors and complex control algorithms by focusing control on key parameters (evaporator outlet temperature and compressor discharge temperature), thereby simplifying the control structure while maintaining effective temperature management.
Solution Approach 2:
The system uses the evaporator outlet temperature sensor to provide feedback that automatically adjusts compressor capacity through the variable displacement mechanism. This self-regulating approach eliminates the need for additional sensors and complex control logic, as the system uses its own operational parameters to control itself.
2Measurement precision
If conventional systems use excessive sensor inputs and complex control algorithms, then measurement precision is improved, but reliability and stability deteriorate due to operational fluctuations
Solution Approach 1:
The patent implements a feedback control mechanism using the evaporator outlet temperature sensor to continuously monitor system performance and adjust compressor capacity accordingly. This closed-loop feedback ensures stable temperature control by automatically compensating for variations in cooling demand without introducing the instability associated with complex multi-sensor systems.
Solution Approach 2:
The system changes the control parameter from multiple temperature measurements to a focused measurement of evaporator outlet temperature combined with compressor discharge temperature monitoring. This parameter simplification reduces measurement noise and control fluctuations, thereby improving reliability and stability.
3Adaptability or versatility
If variable capacity compressors use complex control valves and multiple control inputs, then adaptability is improved, but loss of energy increases due to inefficient fuel consumption
Solution Approach 1:
The patent implements periodic monitoring and adjustment of compressor capacity based on evaporator outlet temperature feedback. The control system continuously cycles through measurement and adjustment phases, optimizing compressor capacity in real-time to match actual cooling demands, thereby reducing energy waste while maintaining adaptability.
Solution Approach 2:
The system optimizes energy efficiency by changing control parameters to focus on evaporator outlet temperature and compressor discharge temperature. This streamlined parameter approach enables the compressor to adapt its capacity efficiently without the energy losses associated with complex multi-sensor control systems, achieving better fuel economy while maintaining versatility.
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 enhances control stability, reduces the need for additional sensors and circuits, optimizes fuel consumption, and provides a more comfortable and efficient air-conditioned environment by precisely managing compressor discharge capacity and temperature control.
Implementation Method 1
A compressor used in an air conditioning system for a vehicle is a part that compresses a gaseous refrigerant discharged from the evaporator under low pressure and discharges to a condenser the refrigerant which is highly pressurized so as to be easily liquefied
Implementation Method 2
a swash plate (60) that is mounted surrounding the driving shaft (40), is rotatably coupled to the plate (50) so that, depending on the rotation of the plate (50), it can be rotated while being slid in the axial direction of the driving shaft (40) to vary its inclination angle
Implementation Method 3
a spring (80) which is elastically mounted between the plate (50) and the swash plate (60) so as to support the swash plate (60) at the minimum inclination angle when the plate (50) is not rotated
Implementation Method 4
discharges to a condenser the refrigerant which is highly pressurized so as to be easily liquefied
Implementation Method 5
a compressor used in an air conditioning system for a vehicle is a part that compresses a gaseous refrigerant discharged from the evaporator
Data Source
AI summary
A method for controlling a vehicular air conditioning system including: setting up a target indoor temperature of a vehicle determined by a user; inputting inside and outside temperatures of the vehicle and solar radiation with reference to a sensor mounted on the vehicle; calculating a target discharge temperature of a vent (t1); inputting the maximum evaporator temperature (t2); setting up a target evaporator temperature by comparing t1 and t2; calculating the opening degree of a temperature control door; measuring actual evaporator temperature while controlling the discharge capacity of a compressor; calculating the opening degree of the temperature control door by using the actual opening degree of the compressor discharge capacity control valve and the actual evaporator temperature.