Hybrid Vehicle Active Vibration Control Using Custom Waveforms
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Solution Overview
Problem
Existing active vibration reduction systems for hybrid electric vehicles face performance degradation due to phase differences between actual engine vibrations and reference signals, primarily because they use sine wave forms that do not accurately match the shape of the actual vibration, leading to suboptimal vibration reduction.
Innovation Solution
An active vibration reduction control apparatus and method that generates a reference signal synchronized with the actual vibration shape, adjusting phase in the frequency domain to minimize phase differences and improve synchronization performance, using a synchronization signal generator that calculates signal amplitudes based on detailed phase values and engine torque models to determine compensating forces for the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sine wave form is used as the reference signal for antiphase torque, then the control system is simple to implement, but the phase synchronization performance between actual vibration and reference signal deteriorates
Solution Approach 1:
The patent changes the waveform parameter from a standard sine wave to a customized waveform that matches the actual vibration shape. The reference signal is generated by shaping it to follow the actual vibration pattern, thereby improving phase synchronization while maintaining reasonable system complexity through parameter adjustment rather than fundamental redesign
Solution Approach 2:
The patent creates a reference signal that copies the actual vibration shape rather than using a theoretical sine wave. By measuring or modeling the actual vibration waveform and using it as the reference, the system achieves better phase alignment between the reference signal and actual vibration, directly improving synchronization performance
2Ease of operation
If phase adjustment is performed in the time domain, then the control process is straightforward, but the phase compensation accuracy for vibration extractor delay is insufficient
Solution Approach 1:
The patent replaces time-domain phase adjustment with frequency-domain phase adjustment. By transforming the signal processing to the frequency domain using Fourier transform or similar methods, the system can directly manipulate phase components with higher precision, compensating for the vibration extractor delay more accurately than time-domain methods allow
3Ease of manufacture
If the reference signal shape does not match the actual vibration shape, then the control system is easier to implement, but the vibration reduction performance deteriorates
Solution Approach 1:
The patent modifies the waveform parameters of the reference signal to match the actual vibration characteristics. By adjusting parameters such as waveform shape, amplitude, and phase to correspond with measured vibration data, the system achieves better vibration reduction effectiveness while maintaining implementation feasibility through parameter tuning rather than complex system redesign
Data Source
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AI summary
An active vibration reduction control apparatus for a hybrid electric vehicle includes: a reference signal generator generating a reference signal and a first phase based on a first rotational angle of a first motor; a vibration extractor extracting a vibration signal from a second motor; a coefficient determiner determining a filter coefficient which minimizes a phase difference between the reference signal and the vibration signal; a phase determiner detecting a second phase which corresponds to the phase difference using a first speed signal of the first motor and the filter coefficient; a phase deviation amount detector detecting a third phase for compensating for a phase delay; and a synchronization signal generator generating an antiphase signal of a shape of an actual vibration in order to determine a compensating force of the first motor.