Vehicle Air Conditioning Compressor Control
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Solution Overview
Problem
Current compressor control systems in vehicle air conditioning systems are inefficient, as they prioritize engine power over compressor operation based on external air temperature, leading to suboptimal cooling performance and insufficient engine power when the accelerator pedal position is low, and fail to consider vehicle speed and engine speed effectively.
Innovation Solution
A method and apparatus that control the compressor's operation rate by integrating vehicle speed, engine speed, accelerator pedal position, and external air temperature using sensors and a controller to adjust the compressor's operation range, enhancing cooling performance and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the compressor is stopped when the accelerator pedal position is high to prioritize engine power, then engine power availability is improved, but cooling performance deteriorates
Solution Approach 1:
The compressor control system transitions from a static on/off control based solely on accelerator pedal position to a dynamic control system that continuously adjusts compressor operation based on real-time vehicle speed, engine speed, accelerator pedal position, and external air temperature. This dynamic adjustment allows the system to optimize both engine power availability and cooling performance under varying operating conditions.
Solution Approach 2:
The system changes the control parameters from a simple binary decision (compressor on/off based on accelerator pedal position) to a multi-parameter decision framework that considers vehicle speed, engine speed, accelerator pedal position, and external air temperature. This parameter expansion enables more nuanced control that resolves the contradiction between engine power availability and cooling performance.
2Temperature
If the compressor operates based only on external air temperature when accelerator pedal position is low, then cooling performance is maintained, but engine power becomes insufficient
Solution Approach 1:
The control system implements feedback by continuously monitoring vehicle speed, engine speed, accelerator pedal position, and external air temperature, then using this information to adjust compressor operation. This feedback mechanism ensures that cooling performance is maintained when needed while preventing excessive compressor operation that would compromise engine power availability.
Solution Approach 2:
The control system serves multiple functions simultaneously: it maintains cooling performance when external air temperature is high, ensures adequate engine power availability, and adapts to varying vehicle operating conditions. This multi-functionality resolves the contradiction by making the compressor control system responsive to both cooling needs and engine power requirements.
3Use of energy by moving object
If the compressor operation range is limited to prioritize fuel efficiency, then fuel consumption is reduced, but cooling performance deteriorates
Solution Approach 1:
The system dynamically adjusts the compressor operation range based on real-time conditions including vehicle speed, engine speed, and external air temperature. This dynamic adjustment allows the system to minimize fuel consumption during mild conditions while ensuring adequate cooling performance when external air temperature is high, effectively resolving the contradiction between fuel efficiency and cooling performance.
4Ease of operation
If the compressor control considers only accelerator pedal position and external air temperature, then control simplicity is maintained, but system adaptability deteriorates
Solution Approach 1:
The control system achieves multi-functionality by integrating multiple sensors (vehicle speed sensor, engine speed sensor, accelerator pedal position sensor, and external air temperature sensor) and using a comprehensive control algorithm that considers all these parameters. This universal approach enables the system to adapt to various operating conditions while maintaining a unified control framework, effectively resolving the contradiction between control simplicity and system adaptability.
Data Source
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AI summary
A method and an apparatus for controlling a compressor of an air conditioning system are provided. The method includes measuring a vehicle speed, an engine speed, a position value of an accelerator pedal, and an external air temperature (S100) and comparing the vehicle speed with a predetermined speed (S110). A basic operation rate of the compressor is then determined based on the engine speed and the position value of the accelerator pedal (S120) when the vehicle speed is equal to or less than the predetermined speed. A final operation rate of the compressor is determined (S130) based on the external air temperature and the determined basic operation rate and the compressor is operated (S140) based on the determined final operation rate.