Fuzzy Logic Control for Oil Injected Compressor Outlet Temperature
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Solution Overview
Problem
Existing systems for controlling the outlet temperature of oil injected compressors or vacuum pumps face issues with energy inefficiency, erratic behavior, and premature wear due to fixed temperature thermostats and fan speeds, leading to condensate formation and mechanical damage.
Innovation Solution
A method using a fuzzy logic algorithm to control the outlet temperature by adjusting the position of a regulating valve and the speed of a fan, ensuring continuous adaptation to changing conditions and preventing condensate formation, while minimizing energy consumption and maintaining system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed temperature thermostat and fixed speed fan are used, then the outlet temperature can be maintained above a minimum limit, but the system becomes energy inefficient and causes rapid wear due to frequent switching
Solution Approach 1:
The patent applies dynamics by transitioning from fixed speed fan operation to variable speed fan control. The fan speed is dynamically adjusted based on the outlet temperature and cooling unit status, allowing the system to maintain temperature control while reducing energy consumption and avoiding frequent on/off switching that causes wear.
Solution Approach 2:
The patent changes the operational parameters by introducing variable fan speed as a controllable parameter. Instead of maintaining constant fan speed, the system varies the fan speed parameter in response to temperature conditions and cooling unit operation, thereby optimizing energy efficiency while maintaining reliable temperature control.
2Reliability
If a fixed temperature thermostat and fixed speed fan are used, then the outlet temperature can be maintained above a minimum limit, but the system causes rapid wear and erratic behavior due to frequent switching
Solution Approach 1:
The patent applies dynamics by transitioning from fixed speed fan operation to variable speed fan control. The fan speed is dynamically adjusted based on the outlet temperature and cooling unit status, allowing the system to maintain temperature control while reducing energy consumption and avoiding frequent on/off switching that causes wear.
Solution Approach 2:
The patent eliminates the harmful periodic on/off action by implementing continuous variable speed control. Instead of the fan switching periodically between on and off states, the system maintains continuous operation with varying speed levels, thereby preventing the mechanical stress and wear associated with frequent switching cycles.
3Reliability
If a PID controller with separate control loops for thermostat and fan is used, then the outlet temperature can be controlled, but the system exhibits erratic and oscillating behavior
Solution Approach 1:
The patent merges the separate control loops for the thermostat and fan into a single integrated control system. The controller simultaneously manages both the regulating valve position and fan speed based on outlet temperature feedback, eliminating the interference and oscillating behavior that occurs when separate PID loops operate independently.
Solution Approach 2:
The patent implements feedback control where the controller continuously monitors the outlet temperature and adjusts both the regulating valve position and fan speed accordingly. This unified feedback mechanism ensures coordinated control actions that maintain temperature stability without the erratic behavior caused by independent control loops interfering with each other.
4Reliability
If the fan is operated at fixed maximum speed, then the outlet temperature can be controlled, but the system consumes excessive energy and causes rapid temperature drops below the minimum limit
Solution Approach 1:
The patent applies dynamics by transitioning from fixed speed fan operation to variable speed fan control. The fan speed is dynamically adjusted based on the outlet temperature and cooling unit status, allowing the system to maintain temperature control while reducing energy consumption and avoiding frequent on/off switching that causes wear.
Solution Approach 2:
The patent applies partial action by operating the fan at variable speeds rather than always at maximum speed. The fan runs at the minimum necessary speed to maintain outlet temperature control, avoiding excessive cooling action that would waste energy and cause temperature to drop below the minimum limit.
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
The method effectively maintains the outlet temperature within optimal limits, preventing condensate formation, reducing energy consumption, and prolonging the lifespan of the compressor or vacuum pump components, with a simple and efficient implementation suitable for existing systems.
Implementation Method 1
a cooling unit connected to said oil inlet
Implementation Method 2
the method further comprises the step of controlling the speed of a fan cooling the oil flowing through the cooling unit
Data Source
AI summary
The present invention is directed to a method for controlling the outlet temperature of an oil injected compressor or vacuum pump comprising a compressor or vacuum element provided with a gas inlet, an element outlet, and an oil inlet, said method comprising the steps of: measuring the outlet temperature at the element outlet; and controlling the position of a regulating valve in order to regulate the flow of oil flowing through a cooling unit connected to said oil inlet; whereby the step of controlling the position of the regulating valve involves applying a fuzzy logic algorithm on the measured outlet temperature; and in that the method further comprises the step of controlling the speed of a fan cooling the oil flowing through the cooling unit by applying the fuzzy logic algorithm and further based on the position of the regulating valve.