Opening Mobile Body Speed Control to Prevent Low-Speed Shaking
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Solution Overview
Problem
Mobile body moving devices experience 'shaking' phenomena due to erroneous speed determinations by detection units when the target to be detected is out of range, leading to repeated speed adjustments and instability at low speeds.
Innovation Solution
A mobile body moving device with a control unit that adjusts the drive unit's operation based on target speed rules, using a rotation sensor to differentiate between high-speed and low-speed regions, where in high-speed regions the actual speed is adjusted to match the target speed and in low-speed regions a predetermined low-speed movement rule is applied to prevent oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection unit detects the target at predetermined time intervals, then the control unit can determine movement speed and position, but the detection unit erroneously determines the drive unit is not being driven when the target is out of detectable range due to low speed
Solution Approach 1:
The patent changes the detection parameters by switching between two different detection methods based on movement speed. When movement speed is high, the detection unit detects targets at normal intervals. When movement speed drops below a threshold, the system switches to a different detection method that uses different detection intervals or criteria, thereby adapting the detection parameters to the current operational conditions and preventing erroneous detection results.
2Speed
If the control unit drives the drive unit to increase movement speed based on erroneous determination, then the movement speed increases to bring it closer to target speed, but this causes repeated increase and decrease of speed leading to shaking
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors movement speed and detection results. When the detection unit provides erroneous information about the drive unit's operation status, the feedback loop identifies this error and adjusts the control signals accordingly. The system compares the expected detection results with actual detection results and modifies the drive unit control to prevent erroneous speed adjustments, thereby maintaining movement stability.
Solution Approach 2:
The patent applies preliminary anti-action by implementing preventive measures before the shaking phenomenon occurs. The control unit monitors detection results and movement speed trends, and when it detects conditions that may lead to erroneous determination (such as target approaching detectable range), it takes preemptive action to adjust detection parameters or drive unit control, thereby preventing the erroneous determination and subsequent shaking from occurring in the first place.
3Device complexity
If the control unit uses a single detection method for all speed regions, then the system structure remains simple, but the detection accuracy and control precision deteriorate at low speeds
Solution Approach 1:
The patent makes the detection system dynamic by enabling it to adapt its operation based on real-time movement speed conditions. The control unit continuously monitors movement speed and dynamically switches between different detection methods or parameters. This dynamic adaptation allows the system to maintain high detection precision across varying speed ranges without requiring a completely complex multi-method system, as only one detection method is active at any given time based on current conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses 'shaking' by stabilizing the movement speed of the mobile body, ensuring smooth operation by accurately controlling the drive unit's speed in both high-speed and low-speed conditions.
Implementation Method 1
a rotation sensor that detects a rotation of the drive unit
Data Source
AI summary
A mobile body moving device includes a mobile body moved to open and close an opening; a drive unit for moving the mobile body; a sensor for detecting movement of the mobile body; and a control unit controlling driving of the mobile body by the drive unit. In a high-speed region, the control unit controls the driving of the drive unit so that an actual speed of the mobile body calculated based on a detected value detected by the sensor is adjusted to a speed calculated by a target movement speed rule by comparing the actual speed and the speed calculated by the target movement speed rule, and in a low-speed region, the control unit controls the driving of the drive unit by comparing a predicted actual speed calculated by a predetermined low-speed movement speed rule and a predicted target speed calculated by the target movement speed rule.