Lock Mechanism Control for Voltage-Stable Mobile Body Engagement
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Solution Overview
Problem
Existing mobile body moving devices fail to accurately position the engaging portion of a lock mechanism due to voltage changes caused by temperature and operation environment, leading to potential motor faults and locking failures.
Innovation Solution
A mobile body moving device with a control section that calculates a reference electrical quantity based on initial voltage and movement time, adjusting the driving time of the driving section to ensure the engaging portion reaches a predetermined position even when voltage changes occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the latch is moved to a predetermined position by rotation of a motor for a certain time, then the engagement operation can be performed, but the position of the moved latch differs from the predetermined position when voltage changes due to temperature and/or operation environment
Solution Approach 1:
The system uses a position detection section to detect the actual position of the engaging portion during movement. The control section continuously monitors this feedback information and compares it with the target position. When voltage changes cause positioning deviations, the feedback mechanism enables real-time detection and correction of the position error, ensuring accurate engagement despite environmental variations.
Solution Approach 2:
The control section adjusts driving parameters dynamically based on detected voltage changes and position feedback. When voltage fluctuations are detected, the system modifies driving time, speed, or torque parameters to compensate for the resulting positioning errors, maintaining precise engagement operation across different operating conditions.
2Reliability
If the position detection section fails, then the engaging portion cannot be engaged with the engaged portion, but continuous operation may cause excessive movement and fault to motor
Solution Approach 1:
The control section is configured to detect position detection section failures and initiate protective actions immediately when such failures are detected. By implementing preliminary protective measures, the system prevents excessive motor movement and potential motor faults before they occur, ensuring safety and reliability even when the position detection section malfunctions.
3Device complexity
If the engaging portion moves to the predetermined position based on fixed driving time, then the control is simple, but positioning accuracy deteriorates when voltage changes
Solution Approach 1:
The system maintains relatively simple control architecture while incorporating position detection feedback. The control section uses this feedback to automatically adjust driving parameters when voltage changes are detected, achieving high positioning accuracy without significantly increasing system complexity. The feedback mechanism enables adaptive control that compensates for voltage variations.
Solution Approach 2:
The control system dynamically changes driving parameters such as driving time and speed based on detected voltage conditions. When voltage changes are detected, the system adjusts these parameters to maintain accurate positioning, allowing the engaging portion to reach the predetermined position precisely despite voltage fluctuations.
Data Source
AI summary
A mobile body moving device includes: a mobile body; an engaged portion; a lock mechanism including an engaging portion, a driving section, and a position detection section; a control section calculating a reference electrical quantity by multiplying time taken for movement of the engaging portion from a movement start position to a predetermined position by an initial voltage for the movement; and a voltage detection section. When determining that the position detection section is abnormal, the control section calculates a necessary driving time from the reference electrical quantity and a movement initial voltage for the movement from the movement start position during the movement, and drives the driving section only for the necessary driving time. Thereby, it is possible to perform control such that the engaging portion of the lock mechanism driven by the driving section is positioned in the predetermined position even when a voltage changes.