Opening And Closing Body Control With Speed Ramping
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Solution Overview
Problem
Existing opening and closing body control systems experience instability when transitioning from manual to automatic operation due to deviations in movement speed, leading to unstable behavior and potential catching issues.
Innovation Solution
A control device that includes a drive mechanism, speed detection, manual operation detection, and a control unit that employs a transition period target value to gradually adjust the target speed from a switching threshold to a basic target value, stabilizing the movement through feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic control is started when manual operation speed reaches a predetermined threshold, then the opening and closing body can be automatically operated, but the deviation between actual speed and target value causes unstable behavior
Solution Approach 1:
The system performs preliminary action by setting a transition period target value before switching to automatic control. This transition period target value is calculated based on the actual speed at the moment of switching, allowing the control system to prepare for the transition and reduce the deviation between actual and target values, thereby stabilizing behavior during the switch from manual to automatic operation
Solution Approach 2:
The system applies dynamics by making the target value dynamic rather than fixed. The transition period target value changes over time, starting from the actual speed at switching and gradually approaching the basic target value. This dynamic adjustment allows the control system to adapt to the current state and maintain stability during the transition period
2Device complexity
If the target value is set to a basic predetermined value, then the control system is simple, but the detected value deviates significantly from the target value causing instability
Solution Approach 1:
The system applies parameter changes by modifying the target value parameter based on the actual operating conditions. Instead of using a fixed basic target value, the system calculates a transition period target value that incorporates the actual speed at switching. This parameter adjustment reduces the initial deviation and maintains stability without significantly increasing system complexity
Solution Approach 2:
The transition period target value acts as an intermediary between the actual speed and the basic target value. Rather than directly comparing the actual speed with the basic target value (which causes large deviation), the system uses this intermediate value that gradually transitions from the actual speed to the basic target value, thereby reducing instability
Data Source
AI summary
An opening and closing body control device includes: a drive mechanism that drives an opening and closing body; a speed detection unit that detects a movement speed of the opening and closing body; a manual operation detection unit that detects manual operation of the opening and closing body; a motor control unit that executes automatic control of performing feedback control of movement of the opening and closing body so that a detected value of the movement speed follows a target value; a target value setting unit capable of setting a basic target value as the target value; and a switching unit that causes the motor control unit to start the automatic control when a switching condition is satisfied. When the automatic control is started, the target value setting unit sets, as the target value, a transition period target value gradually changing from an initial value toward the basic target value.