Air Conditioner Dual PID Heating Control for Faster Temperature Rise
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Solution Overview
Problem
Air conditioners experience slow temperature increase rates during heating mode, leading to prolonged operation times and unsatisfactory heating performance, especially in low indoor temperatures.
Innovation Solution
An air conditioner heating mode control method that employs dual PID control processes, comparing indoor and coil temperatures to determine a higher target frequency for the compressor, and adjusts the coil target temperature based on indoor temperature to accelerate heating and prevent low outlet air temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air conditioner uses built-in logic to calculate target frequency based on temperature difference, then the system operates with simple control logic, but the temperature increase rate becomes slow and heating performance deteriorates
Solution Approach 1:
The patent segments the heating control into two independent PID control loops: one for indoor temperature and one for coil temperature. Each loop calculates target frequency separately, allowing the system to optimize heating performance without complicating the overall control logic. This segmentation enables faster response and better heating efficiency while maintaining operational simplicity.
Solution Approach 2:
The patent implements dynamic adjustment of target frequency by using real-time feedback from both indoor temperature and coil temperature sensors. The system continuously adapts the compressor frequency based on actual thermal conditions, transitioning from static built-in logic to dynamic PID control, thereby improving heating efficiency while keeping the control system manageable.
2Reliability
If the air conditioner operates for a long period to reach desired temperature, then the system ensures adequate heating, but the user experience deteriorates due to slow temperature increase
Solution Approach 1:
The patent employs dual PID control loops with real-time feedback from indoor temperature sensors and coil temperature sensors. This feedback mechanism allows the system to continuously adjust the compressor frequency to optimize heating speed while ensuring the target temperature is reliably reached. The feedback-driven approach significantly reduces the time to reach desired temperature compared to open-loop built-in logic.
Solution Approach 2:
The patent performs preliminary heating by aggressively increasing the compressor frequency early in the heating cycle when the temperature difference is large. The coil temperature PID control pre-heats the heat exchanger efficiently, enabling faster heat transfer to the indoor air, thus reducing overall heating time while maintaining reliable temperature achievement.
3Speed
If the air conditioner increases compressor frequency to accelerate heating, then the temperature increase rate improves, but energy consumption increases
Solution Approach 1:
The patent uses dynamic PID control to adjust compressor frequency based on real-time temperature conditions. The system increases frequency aggressively when temperature difference is large (prioritizing heating speed) and reduces frequency when approaching target temperature (prioritizing energy efficiency). This dynamic adjustment optimizes the balance between heating speed and energy consumption throughout the heating cycle.
Solution Approach 2:
The patent changes the control parameters by introducing coil temperature as an additional controlled variable alongside indoor temperature. This parameter change enables more precise control of the heating process, allowing the system to achieve faster temperature increase rates during critical phases while reducing energy consumption during maintenance phases through optimized frequency modulation.
4Device complexity
If the air conditioner uses single PID control for indoor temperature, then the control system remains simple, but the outlet air temperature may become too low causing discomfort
Solution Approach 1:
The patent segments the control system into two independent PID controllers: one managing indoor temperature and another managing coil temperature. This segmentation adds only moderate complexity while effectively preventing outlet air temperature from becoming too low, as the coil temperature controller directly regulates heat exchanger performance to ensure adequate outlet temperature for user comfort.
Solution Approach 2:
The patent introduces coil temperature as an intermediary controlled variable between the compressor and the indoor air temperature. By controlling coil temperature directly, the system ensures that the heat exchanger maintains sufficient temperature to produce comfortable outlet air, while the indoor temperature PID loop maintains overall thermal comfort. This intermediary approach improves user comfort with manageable system complexity.
Data Source
AI summary
An air conditioner heating mode control method includes: obtaining an indoor temperature and comparing the indoor temperature with a first indoor temperature threshold as an air conditioner running at the heating mode; performing a dual PID control process if the indoor temperature is less than or equal to the first indoor temperature threshold. The dual PID control process obtains an indoor temperature difference; performs a PID calculation according to the indoor temperature difference to obtain a first target frequency; obtains a coil temperature difference; performs a PID calculation according to the coil temperature difference to obtain a second target frequency; compares the first and second target frequencies; and performs a frequency control on the compressor in which the greater one between the first target frequency and the second target frequency is used as the target frequency. The present invention includes an air conditioner heating mode control device.