Variable Speed Engine Load Monitoring via Dynamic Range
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Solution Overview
Problem
Variable speed engines often fail to detect significant load deviations at low speeds due to warning limit values set for high speeds, leading to missed alerts for considerable load moments at low engine speeds.
Innovation Solution
A method and device that determine the actual speed and load moment of an engine, comparing it to a speed-dependent monitoring range, emitting a warning signal when the load moment exceeds or falls below predetermined limits, with varying delayed reaction times for different monitoring ranges to account for machine-specific speed dependencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed warning limit value is set for high speeds, then the monitoring is effective at high speeds, but the monitoring fails to detect significant load deviations at low speeds
Solution Approach 1:
The patent applies dynamics by transforming the fixed warning limit value into a dynamic monitoring range that adapts to the actual engine speed. The monitoring range is predetermined as a function of speed, allowing the system to automatically adjust the acceptable load moment boundaries based on the current operating speed, thus maintaining detection accuracy across all speed ranges
Solution Approach 2:
The patent changes the parameter of the warning limit from a fixed value to a speed-dependent variable. By predetermining monitoring ranges as functions of speed with varying lower and upper limit values, the system transforms the monitoring threshold into a adaptable parameter that responds to changing operating conditions, enabling effective detection at both low and high speeds
2Measurement precision
If the monitoring range is adjusted for low speeds, then detection accuracy improves at low speeds, but the complexity of the monitoring system increases
Solution Approach 1:
The patent applies preliminary action by predetermining the monitoring ranges as functions of speed before actual operation. The speed-dependent monitoring ranges with varying limit values are pre-calculated and stored, allowing the system to simply look up and apply the appropriate range based on current speed without performing complex real-time calculations, thus reducing operational complexity while maintaining precision
Solution Approach 2:
The patent creates a universal monitoring approach where a single speed-dependent monitoring range function serves all operating speeds. Instead of requiring separate monitoring systems or multiple fixed thresholds for different speed ranges, one adaptable monitoring range structure handles the entire speed spectrum, simplifying the overall system architecture while achieving detection accuracy across all conditions
Data Source
AI summary
There is described a method for monitoring the load condition of a variable speed engine. Said method shows a determination of an actual speed and an actual load moment during operation. A warning signal is emitted when the actual load moment remains outside a monitoring range, predetermined depending on the speed, for the duration of a predetermined delayed reaction time.