Torque Estimation Accuracy in Engine Driven Generators
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Solution Overview
Problem
Traditional methods for estimating generator torque in engine-driven systems are not sufficiently accurate, resulting in errors of approximately +/−20 Nm, which hinders tight control and efficient fuel consumption.
Innovation Solution
An engine control system that includes a temperature sensor and a control module determining a torque correction factor based on engine speed, generator characteristics such as duty cycle and field winding voltage, to calculate a corrected generator torque, thereby improving torque estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods of estimating generator torque are used, then the control system is simple, but the torque estimation accuracy deteriorates with errors of approximately +/−20 Nm
Solution Approach 1:
The patent applies parameter changes by using temperature correction factors to adjust the estimated generator torque. The control module determines a torque correction factor based on engine temperature and applies it to the initially estimated torque value. This compensates for temperature-dependent variations in generator characteristics, improving torque estimation accuracy from +/−20 Nm to within a narrower range without requiring a completely new estimation methodology.
2Use of energy by moving object
If tight control of generator torque load is implemented, then fuel consumption improves, but the requirement for measurement precision increases
Solution Approach 1:
The patent implements feedback by continuously monitoring engine temperature and adjusting the torque correction factor accordingly. The control module uses the temperature signal to determine an updated correction factor and applies it to the generator torque estimation in real-time. This closed-loop approach enables tight control of generator torque load for improved fuel consumption while maintaining the required measurement precision through dynamic compensation.
Data Source
AI summary
An engine control system for an engine that drives a generator includes a temperature sensor that generates a temperature signal and a control module that determines a generator torque based on an engine speed and a generator characteristic. The control module determines a torque correction factor based on the temperature signal and determines a corrected generator torque based on the generator torque and the torque correction factor. Various embodiments of the invention utilize engine speed, system voltages field winding duty cycle engine temperature, ambient temperature and/or generator current.