Variable ETC Control Cycle for Engine RPM Stability
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Solution Overview
Problem
Cogeneration systems face challenges in stabilizing engine RPM due to varying loads, leading to RPM hunting and instability, which affects power generation efficiency and reliability.
Innovation Solution
Implementing a method of adjusting the control cycle of electronic throttle control (ETC) based on the range of engine RPM variation and manifold absolute pressure (MAP) to minimize RPM fluctuations and maintain stable engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control cycle of electronic throttle control (ETC) is fixed, then the control system is simple, but the engine RPM hunting increases under varying load conditions
Solution Approach 1:
The patent applies dynamics by making the ETC control cycle variable rather than fixed. The control cycle is dynamically adjusted based on the current operating conditions of the engine, specifically adapting to varying load conditions. This allows the control system to respond appropriately to different operational states, reducing RPM hunting while maintaining manageable complexity through rule-based adaptation.
2Measurement precision
If the ETC control cycle is adjusted frequently, then the engine RPM tracking performance improves, but the control system complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the ETC control cycle parameters based on detected engine operating conditions. Specifically, the control cycle duration is adjusted as a parameter in response to changes in load conditions, allowing the system to optimize RPM tracking precision without requiring a completely complex control architecture. The adjustment is based on measurable parameters like load variations.
3Productivity
If the engine responds quickly to load variations, then the power generation efficiency improves, but the RPM fluctuation increases
Solution Approach 1:
The patent applies feedback by continuously monitoring engine operating conditions and using this information to adjust the ETC control cycle. The system detects load variations and RPM deviations, then feeds this information back to modify the control strategy. This closed-loop approach allows the engine to respond efficiently to load changes while actively correcting RPM fluctuations through adaptive control adjustments.
Data Source
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AI summary
Disclosed are a method of controlling an engine, which is capable of efficiently controlling the engine during power generation, and an engine generation system using the same. The method of controlling an engine for driving a generator in an engine generation system includes performing engine revolution-per-minute (RPM) tracking control so that the engine is driven at a target engine RPM, driving the engine according to a control cycle of electronic throttle control (ETC) set in a table in accordance with a corresponding engine RPM when a load is in a fixed state, determining a range of variation in the RPM of the engine, adjusting the control cycle of ETC according to the range of variation, and driving the engine according to the adjusted control cycle of ETC.