Vehicle Seat Adjustment Device Speed Synchronization
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Solution Overview
Problem
The existing vehicle seat adjustment devices cause annoyance to occupants due to unintended front-rear movement during vertical seat adjustments, as the lift mechanism's rotation results in movement in this direction.
Innovation Solution
A vehicle seat adjustment device with a first adjustment mechanism for front-rear movement and a second adjustment mechanism for both front-rear and vertical movement, controlled by a controller that synchronizes and adjusts the speeds of the motors to minimize front-rear movement during vertical adjustments, ensuring the seat moves primarily in the intended direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the lift mechanism is used to adjust the vertical position of the seat, then the vertical adjustment function is achieved, but the seat moves in the front-rear direction which causes annoyance to occupants
Solution Approach 1:
The controller drives the slide mechanism in advance to compensate for the front-rear movement caused by the lift mechanism. By calculating the expected front-rear displacement based on the lift mechanism's rotation, the system pre-adjusts the slide mechanism to counteract this movement, ensuring the seat remains stable in the front-rear direction while achieving vertical adjustment.
Solution Approach 2:
The system uses detected values from pulse signals or encoders on both the slide mechanism and lift mechanism to calculate actual seat position changes. The controller continuously monitors the movement of both mechanisms and adjusts their operation in real-time to maintain the desired seat position, preventing unwanted front-rear movement during vertical adjustment.
2Productivity
If the slide mechanism and lift mechanism are driven simultaneously, then the seat can reach the target position efficiently, but coordinating the speeds of both mechanisms increases control complexity
Solution Approach 1:
The controller calculates the required rotation amounts for both the slide mechanism and lift mechanism in advance based on the difference between the current seat position and the target position. By pre-calculating the adjustment paths and speeds of both mechanisms, the system coordinates their simultaneous operation to efficiently reach the target position while maintaining simple control logic.
3Manufacturing precision
If the lift mechanism rotates the support member to change vertical position, then vertical adjustment is achieved, but the rotation inherently includes front-rear movement that cannot be avoided without additional control
Solution Approach 1:
The slide mechanism acts as an intermediary to decouple the front-rear movement from the vertical adjustment. While the lift mechanism handles vertical positioning, the slide mechanism compensates for the coupled front-rear movement, allowing the support member to rotate for vertical adjustment without directly causing unwanted front-rear displacement of the seat.
Data Source
AI summary
A vehicle seat adjustment device includes a first adjustment mechanism, a second adjustment mechanism, and a controller. The first adjustment mechanism is moved in a first direction upon driving of a first motor to adjust a position of a vehicle seat. The second adjustment mechanism is moved in both the first direction and a second direction orthogonal to the first direction upon driving of a second motor to adjust the position of the vehicle seat. The controller controls and drives the first motor and the second motor. A speed at which the second adjustment mechanism is moved in the first direction is lower than or equal to a speed at which the first adjustment mechanism is moved in the first direction. When the second motor needs to be driven, the controller drives the second motor while driving the first motor.