Method for controlling window air conditioner
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Solution Overview
Problem
Window air conditioners with fixed speed compressors face issues such as unreliable operation and poor user comfort due to excessive outdoor temperatures causing compressor shutdowns, leading to prolonged recovery times and inefficient temperature control.
Innovation Solution
A method for controlling window air conditioners that involves using multiple temperature sensors to detect indoor and outdoor ambient temperatures, heat exchanger temperatures, and exhaust gas temperatures to determine a minimum compressor frequency, allowing the compressor to operate at this frequency to prevent shutdowns and ensure reliable operation and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed speed compressor with simple logic control is used, then the device complexity is reduced, but the reliability of compressor operation deteriorates due to shutdowns at high outdoor temperatures
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed speed compressor to an inverter compressor with variable frequency control. The compressor speed dynamically adjusts based on multiple temperature parameters (indoor ambient temperature T1, indoor heat exchanger temperature T2, outdoor heat exchanger temperature T3, outdoor ambient temperature T4, and exhaust gas temperature TP), enabling continuous operation at optimized speeds rather than binary on/off states, thereby preventing shutdowns and improving reliability.
Solution Approach 2:
The patent implements parameter changes by using multiple temperature sensors to detect different temperature parameters and calculating corresponding compressor frequencies based on each parameter. The control system compares these frequencies and selects the minimum frequency to ensure the compressor operates within safe temperature limits, preventing shutdowns caused by excessive temperatures while maintaining reliable operation.
2Device complexity
If a fixed speed compressor operates at high outdoor temperatures, then the device structure remains simple, but the compressor shuts down due to excessive temperature, resulting in poor user comfort experience
Solution Approach 1:
The inverter compressor dynamically adjusts its operating frequency based on real-time temperature monitoring from multiple sensors. This dynamic control allows the compressor to operate continuously at variable speeds, avoiding the on/off cycling that causes temperature fluctuations and discomfort, thereby significantly improving user comfort experience while maintaining a relatively simple control structure.
Solution Approach 2:
The patent implements feedback control by continuously monitoring five different temperature parameters (T1, T2, T3, T4, TP) and adjusting the compressor frequency accordingly. The control system calculates the minimum frequency required to maintain safe operating temperatures and adjusts the compressor speed in real-time, ensuring stable operation and consistent cooling/heating performance, which directly improves user comfort.
3Device complexity
If the compressor operates with stop-operation-stop cycles to control indoor temperature, then the control logic remains simple, but the temperature control precision deteriorates and user comfort decreases
Solution Approach 1:
The patent replaces the binary stop-operation-stop control with continuous variable frequency control. The inverter compressor adjusts its speed dynamically based on the difference between the current indoor temperature (T1) and the setpoint temperature, allowing precise temperature control without complete shutdowns. This eliminates temperature fluctuations and maintains consistent comfort while using straightforward control logic.
Solution Approach 2:
The control system changes the operating parameter from binary (on/off) to continuous (variable frequency). By calculating the minimum compressor frequency based on multiple temperature parameters including indoor ambient temperature T1, the system achieves precise temperature control through gradual adjustments rather than abrupt on/off cycling, thereby improving temperature control precision while maintaining simple control logic.
Data Source
AI summary
A method for controlling an air conditioner includes, after the air conditioner is turned on, controlling an indoor ambient temperature sensor, an indoor heat exchanger temperature sensor, an outdoor heat exchanger temperature sensor, an outdoor ambient temperature sensor, and an exhaust gas temperature sensor to determine an indoor ambient temperature, an indoor heat exchanger temperature, an outdoor heat exchanger temperature, an outdoor ambient temperature, and an exhaust gas temperature, respectively, determining a first, second, third, fourth, and fifth compressor frequencies based on the indoor ambient temperature, the indoor heat exchanger temperature, the outdoor heat exchanger temperature, the outdoor ambient temperature, and the exhaust gas temperature, respectively, determining a minimum compressor frequency based on the first, second, third, fourth, and fifth compressor frequencies, and controlling a compressor of the air conditioner to operate at the minimum compressor frequency.