Power Generator Start Torque Control Across Resonance Band
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Solution Overview
Problem
When the electric power output by the battery is insufficient for starting a power generation system, the rotation speed of the engine cannot be rapidly increased to a speed exceeding the resonance frequency band, leading to prolonged oscillation and reduced efficiency.
Innovation Solution
A method for controlling the starting of a power generation system that involves acquiring the output possible electric power of the battery and filtering the rotation speed of the electrical generator to reduce resonance frequency components. An upper limit torque is calculated based on the filtered rotation speed and the battery's output power, and the rotation speed control is executed under this torque limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the battery outputs maximum electric power to drive the electrical generator during starting, then the rotation speed of the electrical generator can be rapidly increased, but the fluctuation in rotation speed is promoted and the system oscillates within the resonance frequency band
Solution Approach 1:
The patent applies dynamics by making the upper limit torque variable rather than fixed. The controller dynamically adjusts the upper limit torque based on the actual rotation speed of the electrical generator, allowing the system to adapt to changing conditions during the starting process. This dynamic adjustment enables rapid speed increase while preventing excessive fluctuation that would cause resonance oscillation.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the actual rotation speed of the electrical generator and using this information to adjust the upper limit torque. The controller receives feedback about the current speed state and modifies the torque limitation accordingly, creating a closed-loop control system that balances speed increase with oscillation suppression.
2Loss of energy
If the battery has insufficient output power, then the rotation speed cannot be rapidly increased to exceed the resonance frequency band, but the system avoids oscillation by staying below the resonance frequency
Solution Approach 1:
The patent makes the upper limit torque dynamic based on actual rotation speed feedback, allowing the system to optimize the balance between power consumption and starting time. This enables the system to achieve the necessary speed increase even with limited battery power while minimizing the time spent in the resonance frequency band.
Solution Approach 2:
The patent changes the parameter of upper limit torque from a fixed value to a variable that depends on actual rotation speed. This parameter change allows the system to adapt to different battery power conditions and optimize the starting process to minimize both energy loss and time loss.
3Stability of the object's composition
If the rotation speed control matches the electrical generator speed with target speed, then the system achieves stable operation, but the fluctuation in rotation speed is promoted and the time in resonance frequency band is prolonged
Solution Approach 1:
The patent applies dynamics by making the upper limit torque variable rather than fixed. The controller dynamically adjusts the upper limit torque based on the actual rotation speed of the electrical generator, allowing the system to adapt to changing conditions during the starting process. This dynamic adjustment enables rapid speed increase while preventing excessive fluctuation that would cause resonance oscillation.
Solution Approach 2:
The patent applies the skipping principle by enabling the system to rapidly pass through the resonance frequency band rather than lingering in it. By dynamically adjusting the upper limit torque, the system can quickly increase rotation speed and move through the problematic resonance frequency range, minimizing the time spent in this unstable region.
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
This approach enables the rapid increase of the electrical generator's rotation speed beyond the resonance frequency band even with limited battery power, effectively reducing oscillations and improving the efficiency of the power generation system.
Implementation Method 1
the electrical generator may be driven by electric power supplied from a battery to rotate the engine idly (so-called motoring)
Implementation Method 2
the power generation system oscillates when a rotation speed of the electrical generator or the like is within a resonance frequency band of the power generation system
Data Source
AI summary
A power generation system includes an internal combustion engine, an electrical generator, and a power transmission mechanism. A method for controlling the system includes executing rotation speed control of driving the electrical generator by using electric power supplied from a battery, and matching a rotation speed of the electrical generator with a target rotation speed at the time of starting the power generation system. Output possible electric power of the battery and rotation speed of the electrical generator are acquired. A filtering process of reducing a component of a resonance frequency band of a spring-mass system including the engine, generator, and power transmission mechanism is executed on the rotation speed of the electrical generator. An upper limit torque of the electrical generator is calculated based on the filtered rotation speed and the output possible electric power. The rotation speed control is executed under a limitation of the upper limit torque.