Power Seat Motor Synchronization via Dynamic Feedback Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power seat devices in vehicles experience discomfort due to differences in motor operation speed and load, leading to association failures where one motion (reclining or tilting) is terminated earlier than the other, causing discomfort to the occupant.
Innovation Solution
A power seat device with a reclining motor, tilting motor, and a switch that simultaneously drives both, along with a correspondence position acquisition unit and output adjustment unit to ensure the seatback reaches the end position in its reclining range and the seat reaches the end position in its tilting range without discomfort, by adjusting the motor outputs based on detected positions and deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reclining motor and tilting motor operate simultaneously with fixed outputs, then the seatback and seat are driven to move, but the motor operation speed differences and load variations cause association failure where one motion is terminated earlier than the other
Solution Approach 1:
The control unit continuously monitors the actual positions of the seatback and seat during movement, compares them with target positions, and dynamically adjusts motor outputs based on detected deviations. This feedback mechanism ensures both motions reach their end positions simultaneously despite individual motor speed variations and load changes.
Solution Approach 2:
The system transitions from fixed motor outputs to dynamic output adjustment where the motor commands are continuously modified during operation. The control unit adapts the driving force of each motor in real-time based on actual position feedback, enabling flexible compensation for speed and load variations.
2Reliability
If the output of one motor is adjusted to compensate for speed differences, then synchronization is improved, but the control system becomes more complex
Solution Approach 1:
A feedback control loop is implemented where position detectors monitor the actual positions of the seatback and seat, the control unit calculates deviations from target positions, and adjusts motor outputs accordingly. This closed-loop system achieves precise synchronization without requiring complex mechanical linkages or additional actuators.
Solution Approach 2:
The patent replaces complex mechanical synchronization mechanisms with an electronic control system that uses feedback signals and software algorithms to coordinate motor movements. This substitution reduces mechanical complexity while achieving reliable synchronization through intelligent control.
Data Source
AI summary
A power seat device is configured to acquire a target associated position of a tilted position, corresponding to a current position of a seatback for allowing the seatback to reach an end position in a reclining range, and a seat to reach an end position in a tilting range simultaneously. Outputs of a reclining motor and a tilting motor are adjusted so that the tilted position coincides with the acquired target associated position.