Engine Torque Vibration Control Using Selective Opposite-Phase Torque
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Solution Overview
Problem
Existing control devices fail to adequately reduce vehicle vibrations caused by torque variations from internal combustion engines, particularly those occurring outside the explosion primary period, and may amplify these vibrations due to the use of opposite-phase torque from rotary electric machines.
Innovation Solution
A control device that includes input torque detection, first and second filter processing, and vibration reduction control to selectively apply opposite-phase torque only when necessary, avoiding amplification of longer-period torque variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration reduction torque is output from the rotary electric machine to reduce vibration, then the vibration component having the explosion primary period is reduced, but the vibration component other than the explosion primary period may be amplified
Solution Approach 1:
The patent segments the vibration reduction control into multiple frequency components using band-pass filters. Specifically, it separates the torque variation into a first vibration component (explosion primary period) and a second vibration component (other periods), then applies different control strategies to each component, allowing selective cancellation of harmful vibrations while preserving or reducing amplification of other components
Solution Approach 2:
The patent applies local quality by making the vibration reduction torque frequency-dependent. Different frequency components of the torque variation are processed differently: the explosion primary period component is actively reduced through opposite-phase torque, while other frequency components are either preserved or reduced in amplification, creating a non-uniform (local) control strategy across the frequency spectrum
2Measurement precision
If filter processing is applied to extract torque components, then the explosion primary period vibration is reduced, but other vibration components may remain or be amplified depending on filter characteristics
Solution Approach 1:
The patent uses multiple band-pass filters with different frequency ranges to segment the torque variation signal. The first band-pass filter extracts components around the explosion primary period frequency, while the second band-pass filter extracts other frequency components. This segmentation allows precise identification and separate handling of different vibration sources without mutual interference
Solution Approach 2:
The patent introduces an intermediary mechanism - the band-pass filters and frequency-based selection logic - that mediates between the raw torque variation signal and the final vibration reduction torque. This intermediary processing stage selectively passes or attenuates specific frequency components, enabling precise control over which vibrations are reduced and which are preserved
Data Source
AI summary
There are provided: an input torque detection part configured to detect an input torque variation value; a first filter processing part configured to extract and obtain, from the input torque variation value, a post-first-filter variation value that varies with a specific variation period; a vibration reduction control part configured to calculate an opposite-phase torque variation value whose phase is opposite to a phase of the post-first-filter variation value, and execute vibration reduction processing; and a second filter processing part configured to extract and obtain, from the post-first-filter variation value, a post-second-filter variation value that varies with a period longer than the specific variation period. The vibration reduction control part is configured to cause the vibration reduction processing to be brought into a non-execution state based on the post-second-filter variation value.