Compressor PID Control with Temperature-Triggered Speed Adjustment
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Solution Overview
Problem
Current PID control systems for evaporator temperature in automotive compressors make unnecessary adjustments to compressor speed due to fixed frequency operation, leading to unneeded electrical power usage, especially when the evaporator temperature is within acceptable tolerances.
Innovation Solution
A control system that detects changes in evaporator temperature and only initiates compressor speed adjustments when the temperature change exceeds a predetermined value, using a double feedback loop with a Δt check block to prevent unnecessary recalculations and ensure adjustments are made only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control algorithm operates at a fixed frequency to maintain evaporator temperature, then the temperature control is consistent and reliable, but unnecessary compressor speed adjustments occur when temperature is within acceptable tolerances, increasing electrical power consumption
Solution Approach 1:
The control system dynamically adjusts the operation frequency of the PID controller based on actual temperature deviations rather than using a fixed frequency. When temperature remains within acceptable tolerances, the controller reduces its operation frequency or enters sleep mode, eliminating unnecessary compressor adjustments and reducing electrical power consumption while maintaining reliable temperature control when needed
Solution Approach 2:
The system changes the operational parameters of the control algorithm by introducing a temperature threshold parameter. When the temperature deviation exceeds this parameter, full control operation is activated; when within the threshold, the system transitions to a low-power state. This parameter-based control resolves the contradiction by adapting the control intensity to actual temperature conditions
2Manufacturing precision
If the control algorithm recalculates compressor speed at every time interval, then the evaporator temperature is continuously optimized, but the system performs unnecessary calculations and adjustments when temperature fluctuations are minor, wasting computational resources and energy
Solution Approach 1:
The control system applies partial action by performing full control algorithm calculations only when temperature deviations exceed a predetermined threshold. When temperature remains within acceptable ranges, the system performs minimal or no calculations, avoiding excessive computational energy consumption while maintaining sufficient temperature precision through threshold-based triggering of full control cycles
Data Source
AI summary
A control system, which may be a Proportional Integral Derivative (PID) control system, controls a component by adjusting the control input and the execution of the control output whenever a change in a state of a component exceeds a certain value. A method is also described.