Active Vibration Damping Device Using Gear-Based Map Segmentation
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Solution Overview
Problem
Existing active vibration damping devices face challenges in controlling vibrations from internal combustion engines due to an exponential increase in data requirements as the number of engine states increases, making it difficult to manage without large storage capacity.
Innovation Solution
An active vibration damping device that uses a vibration control unit with gear position detection to execute amplitude and phase control strategies, allowing for switching between fixed and variable control modes based on engine rotation information, reducing the amount of data needed by using maps for specific control modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If maps are set for each gear position to improve control accuracy, then vibration suppression performance is improved, but the number of maps increases exponentially requiring large storage capacity
Solution Approach 1:
The patent segments the control approach by dividing gear positions into two categories: driving positions (1st to 4th gear) and non-driving positions (neutral and reverse). Instead of creating separate maps for each gear position, the system uses a single map for driving positions and another single map for non-driving positions. This segmentation reduces the number of maps from potentially 6+ individual gear-specific maps to just 2 category-based maps, significantly reducing storage requirements while maintaining control accuracy through category-appropriate control strategies.
2Reliability
If multiple maps are provided for different gear positions to achieve fine corrections, then vibration suppression performance is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by creating control maps that serve multiple gear positions simultaneously. The first control map is universally applied to all driving positions (1st, 2nd, 3rd, 4th gear), and the second control map is universally applied to all non-driving positions (neutral, reverse). This multi-functional approach allows a single map to handle multiple gear positions, reducing the overall number of maps needed and simplifying the control system architecture while maintaining effective vibration suppression across all gear positions.
Data Source
AI summary
An ACM-ECU executes a first switching control for switching from a phase fixed control to a phase variable control, or a second switching control for switching from the phase variable control to the phase fixed control, simultaneously with detecting or after having detected switching of a gear position by a gear position detecting function. A current waveform map is used at a time of execution of the phase variable control, and a correction map is used at a time of execution of the phase fixed control.