Vehicle Climate Control With Compressor-Fan Energy Balancing
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Solution Overview
Problem
Conventional climate control systems in vehicles consume excessive energy, particularly due to the operation of air conditioning compressors and cooling fans, which reduces fuel efficiency and increases engine load, especially in hybrid electric vehicles where engine shutdown benefits are offset by inefficient climate control operations.
Innovation Solution
A climate control system that utilizes a variable speed electric compressor and fan, controlled by an electronic controller that adjusts compressor and fan speeds based on real-time energy consumption monitoring and vehicle operating conditions to minimize overall power usage while maintaining passenger comfort, including strategies to reduce compressor power by increasing fan speed and vice versa, and optimizing evaporator core temperatures to reduce unnecessary hot air mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air conditioning compressor and cooling fan are operated to provide cooling, then the cabin temperature is maintained, but the energy consumption increases significantly
Solution Approach 1:
The system dynamically adjusts compressor speed and fan speed based on real-time cabin temperature, ambient conditions, and vehicle operating state. The controller continuously optimizes the operational parameters of the air conditioning system to maintain cooling effectiveness while minimizing energy consumption, particularly during partial load conditions.
Solution Approach 2:
The system changes operational parameters including compressor discharge pressure, evaporator temperature, and fan speed to optimize the balance between cooling performance and energy consumption. By adjusting these parameters dynamically, the system achieves efficient operation across varying environmental conditions and cooling demands.
2Power
If the engine mechanically drives the compressor at higher speed to increase cooling capacity, then the cooling performance improves, but the fuel consumption increases
Solution Approach 1:
The system employs dynamic control of compressor speed based on actual cooling demand rather than operating at fixed high speed. The controller monitors cabin temperature, ambient conditions, and vehicle state to adjust compressor power output, ensuring adequate cooling while minimizing the mechanical load on the engine and reducing fuel consumption.
Solution Approach 2:
The system uses feedback from temperature sensors and system performance monitors to continuously adjust compressor operation. This closed-loop control ensures that the compressor operates at the minimum necessary power level to maintain cabin comfort, preventing excessive fuel consumption while meeting cooling requirements.
3Temperature
If hot air mixing is used to achieve desired discharge temperature, then the temperature control flexibility improves, but the energy waste increases
Solution Approach 1:
The system optimizes evaporator temperature and compressor discharge pressure to achieve the desired discharge air temperature directly, reducing or eliminating the need for hot air mixing. By adjusting these parameters dynamically, the system maintains temperature control flexibility while minimizing energy waste associated with mixing hot and cold air streams.
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 reduces energy consumption and fuel drain, preserving battery charge and improving fuel economy by optimizing the balance between comfort and energy efficiency, while minimizing the impact on passenger comfort.
Implementation Method 1
control movement of air through an evaporator core or a heater core
Implementation Method 2
an air conditioning compressor and a condenser to effectuate cooling of a passenger cabin
Implementation Method 3
A cooling fan is disposed adjacent the condenser to further effectuate cooling
Data Source
AI summary
A climate control system and method for optimizing energy consumption in a hybrid electric vehicle (HEV) is provided. By varying evaporator temperatures based on occupant settings and environmental conditions, electric compressor speed can be optimized to provide the necessary cooling capacities resulting in energy savings. Determining the impact that increasing or decreasing engine cooling fan speed has on the overall energy consumption of the climate control system without affecting target discharge air temperature provides for energy saving opportunities. Optimizing energy consumption according to the provided strategy provides for improved fuel economy without sacrificing passenger comfort.