Opening/Closing Speed Control Using Two-Phase Pulse Updates
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Solution Overview
Problem
There is a need to improve the control accuracy of the opening/closing speed of opening/closing bodies, such as vehicle doors, which is not adequately addressed by existing technologies.
Innovation Solution
An opening/closing body control device that utilizes a rotation sensor to output two pulse signals with a phase difference, enabling two-pulse update processing to measure and control the opening/closing speed more accurately by synchronizing the update timing with the detection timings of both pulse edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single pulse signal update processing is used, then device complexity is reduced, but measurement precision and control accuracy deteriorate
Solution Approach 1:
The patent segments the pulse signal detection into two separate channels (first pulse signal and second pulse signal) with different phase timings. This segmentation allows the system to detect pulse edges at multiple different time points within each rotation cycle, thereby improving the measurement precision of opening/closing speed without requiring complex hardware modifications.
2Productivity
If update timing is synchronized with single pulse edge, then processing simplicity is maintained, but measurement frequency and control accuracy are limited
Solution Approach 1:
The patent implements periodic action by utilizing multiple pulse signals with different phases that occur periodically during motor rotation. By detecting pulse edges from both the first and second pulse signals, the system performs speed measurements at multiple periodic intervals within each rotation cycle, thereby increasing the overall measurement frequency and reducing the time loss between consecutive measurements.
3Reliability
If two-pulse update processing is implemented, then control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies feedback by continuously monitoring the opening/closing speed through two-pulse update processing and using this information to adjust motor control. The system measures speed based on pulse edge detection from two different pulse signals, feeds this measurement back to the control unit, and adjusts motor operation accordingly, thereby improving control accuracy and reliability while maintaining manageable processing complexity through systematic feedback loops.
Data Source
AI summary
An opening/closing body control device includes: a rotation sensor that outputs a first pulse signal and a second pulse signal having a phase difference from the first pulse signal; an edge detection unit detects a pulse edge of the pulse signal; a speed update unit that measures and updates an opening/closing speed on the basis of a pulse signal at a predetermined update timing; and a motor control unit controls the motor according to the updated opening/closing speed. The speed update unit executes two-pulse update processing of setting, as the update timing, the timing at which at least one of a first rising edge and a first falling edge is detected and the timing at which at least one of a second rising edge and a second falling edge is detected.