Dynamometer Control Device Torque Oscillation Suppression
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Solution Overview
Problem
Dynamometer control devices face oscillation issues in low rotation ranges due to delays in speed detection signals, which affect torque command signals and shaft torque detection signals, leading to instability in dynamometer control.
Innovation Solution
A dynamometer control device that generates a torque command signal using a higher-order command signal, speed detection signal, and shaft torque detection signal, with a second input signal generated based on a weighted speed detection signal, where the weight signal changes according to threshold values to mitigate oscillations in low rotation ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a speed detector is used to generate speed detection signal for dynamometer control, then the rotational speed of the dynamometer can be detected, but the speed detection signal rises slower than the shaft torque detection signal causing oscillation in the torque command signal
Solution Approach 1:
A delay amount calculator is introduced as an intermediary component that calculates the delay amount between the shaft torque detection signal and the speed detection signal. This delay calculation enables the system to compensate for the timing mismatch, preventing oscillation in the torque command signal while maintaining accurate speed detection.
Solution Approach 2:
The system dynamically adjusts the delay amount parameter based on the relationship between the shaft torque detection signal and the speed detection signal. By changing this parameter, the system optimizes the timing alignment of control signals, eliminating oscillation in low rotation ranges while preserving measurement precision.
2Stability of the object's composition
If the weight signal value is made small when the speed detection signal is low, then oscillation in the low rotation range is suppressed, but the response to actual speed changes may be reduced
Solution Approach 1:
The weight signal value is made dynamic rather than fixed. The delay amount calculator continuously determines the appropriate delay amount based on real-time signal relationships, allowing the system to adapt the weight signal to current operating conditions. This dynamic adjustment suppresses oscillation in low rotation ranges while maintaining appropriate response to actual speed changes.
Solution Approach 2:
The system uses feedback from the relationship between shaft torque detection signal and speed detection signal to adjust the delay amount and weight signal. This feedback mechanism ensures that the weight signal is optimized for current operating conditions, preventing oscillation while preserving necessary control responsiveness.
Data Source
AI summary
An input-side control device includes a first input signal generation unit for generating a first input signal on the basis of the deviation between an engine torque command signal and an input-side shaft torque detection signal; a second input signal generation unit for generating a second input signal on the basis of an input-side speed detection signal weighted according to a prescribed weighting signal; and a torque command signal generation unit for generating a torque command signal on the basis of the first and second input signals. If the value of a filtered signal obtained from the input-side speed detection signal is less than a prescribed threshold, the second input signal generation unit makes the value of the weighting signal lower than if the value of the filtered signal were greater than or equal to the threshold.