Vehicle Headrest Control for High-Frequency Lateral Vibration
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Solution Overview
Problem
Existing vehicle seat devices fail to adequately reduce discomfort caused by high-frequency vibrations in the vehicle width direction, as they do not effectively control the movement of the occupant's head, leading to interference with the headrest and increased discomfort.
Innovation Solution
A vehicle seat device equipped with a headrest and a rest operation adjustment mechanism, controlled by a controller that adjusts the contact area between the headrest and the occupant's head based on the frequency of vehicle vibrations, allowing movement when vibrations exceed a predetermined threshold to synchronize head and torso movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headrest maintains a fixed contact area with the occupant's head, then the headrest provides stable support, but during high-frequency vibrations the head interferes with the headrest side support which aggravates the quick swing and increases discomfort
Solution Approach 1:
The headrest's contact area with the occupant's head is made dynamically adjustable based on vibration frequency. During high-frequency vibrations, the contact area is reduced to allow head movement and prevent interference with side support. During low-frequency vibrations, the contact area is maintained for stable support. This dynamic adjustment resolves the contradiction between stable support and preventing discomfort from head interference.
Solution Approach 2:
The physical parameter of contact area between the headrest and head is changed based on vibration conditions. By varying this parameter (contact area) in response to vibration frequency, the system achieves both stable support during normal conditions and reduced interference during high-frequency vibrations, thereby resolving the technical contradiction.
2Stability of the object's composition
If the headrest restricts head movement to provide support, then the occupant's head is stabilized, but during high-frequency vibrations this restriction causes the head to interfere with the headrest side support and aggravates swing
Solution Approach 1:
The headrest's restraining force on the head is made dynamically adjustable. During high-frequency vibrations, the headrest allows greater head movement by adjusting the contact area, preventing interference with side support and reducing swing aggravation. During low-frequency vibrations, the headrest maintains strong restriction for stable head position. This dynamic control resolves the contradiction between stability and preventing swing aggravation.
3Duration of action of stationary object
If the headrest maintains constant contact with the head, then support is continuous, but during high-frequency vibrations the contact prevents natural head movement and increases discomfort
Solution Approach 1:
The headrest's contact area is periodically adjusted based on the vibration cycle. During high-frequency vibration periods, the contact area is reduced to allow natural head movement. During low-frequency or stable periods, full contact is maintained for continuous support. This periodic adjustment resolves the contradiction between continuous support and allowing natural movement during vibrations.
Data Source
AI summary
Provided is a vehicle seat device that includes a headrest to support a head of an occupant seated on a vehicle seat. The vehicle seat device includes a rest operation adjustment mechanism provided on the headrest and to restrict or allow movement of the head of the occupant seated on the vehicle seat and a controller that controls the rest operation adjustment mechanism to allow the movement of the head of the occupant when a frequency of a vibration in a width direction of a vehicle is equal to or larger than a predetermined value.