Piston Engine Speed Controller Adaptive Oscillation Mitigation
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Solution Overview
Problem
Existing speed controllers for piston engines face challenges in maintaining stable engine speed due to oscillations caused by changes in engine conditions, such as wear and tear, varying load, and environmental factors, leading to potential damage from excessive stress on flexible couplings.
Innovation Solution
A speed controller with a monitoring section that analyzes oscillations and generates control signals to mitigate harmful oscillations, using interfaces to receive and transmit data, and employing filters, computation, comparison, and selection elements to determine and respond to variance in engine speed, allowing for adaptive control without detailed engine modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the controller is tuned to respond rapidly to changes in engine load, then the response speed is improved, but the engine speed oscillates more at stable speed
Solution Approach 1:
The patent implements dynamic retuning of controller parameters based on operating conditions. The monitoring section continuously analyzes engine responses and adjusts controller parameters in real-time, transforming the static controller into a dynamic system that adapts to changing conditions. This resolves the contradiction by allowing rapid response when needed while maintaining stability during steady operation.
Solution Approach 2:
The patent changes controller parameters dynamically based on monitored engine responses. By analyzing variance in engine speed and adjusting controller gain and other parameters accordingly, the system optimizes the balance between response speed and stability. This parameter adaptation resolves the fixed-tuning limitation that causes oscillation-stability trade-offs.
2Stability of the object's composition
If the controller is tuned to eliminate oscillation of engine speed at stable speed, then the stability is improved, but the response to changes in engine load becomes slow
Solution Approach 1:
The monitoring section dynamically adjusts controller parameters based on real-time engine response analysis. When the engine operates at stable speed, parameters are tuned to minimize oscillation. When load changes occur, parameters are adjusted to improve response speed. This dynamic adaptation resolves the contradiction between stability and response speed.
Solution Approach 2:
The system changes controller parameters based on operating conditions and monitored responses. By analyzing engine speed variance and adjusting parameters like gain and integral time, the controller optimizes performance for each operating regime, achieving both stability during steady operation and rapid response during transients.
3Device complexity
If traditional PID controller tuning is used, then the device complexity is low, but the controller cannot adapt to changing engine conditions such as wear and tear, leading to increased oscillation or slower response
Solution Approach 1:
The patent introduces a monitoring section that continuously measures engine speed and analyzes the controller's effect on engine responses. This feedback loop provides information about actual engine behavior under current conditions, enabling the controller to adapt to changes like wear and tear without increasing overall system complexity significantly.
Solution Approach 2:
The controller performs self-diagnosis and self-adjustment by monitoring its own output effects on engine speed. The monitoring section analyzes engine responses to controller actions and automatically retunes parameters, allowing the system to adapt to changing conditions without external intervention or complex modeling.
4Speed
If the speed controller causes oscillations at resonant frequency, then the control responsiveness is improved, but the flexible coupling experiences excessive stress and may break
Solution Approach 1:
The monitoring section analyzes engine responses to predict when controller actions might excite resonant frequencies. By detecting patterns in engine speed variance and anticipating harmful oscillations, the system takes preliminary action to adjust parameters before excessive stress occurs on the flexible coupling, preventing damage while maintaining control effectiveness.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention reduces oscillations in the rotational speed of an engine caused by the speed controller. This is achieved through a piston engine speed controller that can analyse the oscillations it is causing and take the necessary action on this basis. The action may constitute the generation and transmission of a message to a monitoring unit, or adjustment of the speed control to reduce oscillation. The speed controller has a monitoring section (10) for monitoring the responses in engine speed caused by the actions of the speed controller (4). The monitoring section is arranged to generate a control change signal to control the speed controller (4) as necessary, and to generate a message regarding the response caused by controller operation as necessary.