Vehicle Seat Side Airbag Layout for Reversible Seating

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Solution Overview

Problem

Existing vehicle seat airbags are designed for passengers facing the front of the vehicle and do not provide adequate protection for those facing the rear, which is a gap in autonomous vehicle safety systems where passengers may face either direction.

Innovation Solution

A vehicle seat assembly with a movable backrest and integrated side airbag system that includes two non-communicating airbags, each deployed based on the seat's orientation, using separate gas generators to provide protection regardless of the passenger's facing direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a conventional seat structure with separate components is used, then the manufacturing and assembly processes are complex and time-consuming, but the structural integrity and adjustability are compromised

Engineering Contradiction:
Improvemanufacturing and assembly processVSAvoidstructural integrity and adjustability
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent integrates the seat cushion, seat back, headrest, and adjustment mechanisms into a single molded plastic shell structure. This merging of previously separate components into one unified structure simplifies manufacturing to a single molding process and eliminates multiple assembly steps, while maintaining all necessary structural integrity and adjustability features through integrated design elements.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The single plastic shell structure performs multiple functions simultaneously: it provides structural support, defines the seat geometry, houses adjustment mechanisms, and incorporates mounting points. This multi-functionality eliminates the need for separate structural frames, upholstery frameworks, and adjustment mechanism housings, thereby simplifying both manufacturing and assembly while preserving all required functionalities.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple separate components are used in the seat assembly, then adjustability and customization options are improved, but the number of parts and assembly complexity increase

Engineering Contradiction:
Improveadjustability and customizationVSAvoidnumber of parts and assembly complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

While the outer shell is a single integrated piece, the patent incorporates segmented adjustment mechanisms within it. The headrest is a separate adjustable component that can be positioned at multiple heights, and the seat pan and backrest are independently adjustable. This segmentation of adjustment functions within the unified structure provides versatility without increasing overall assembly complexity.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent incorporates dynamic adjustment capabilities where the seat cushion angle, seat back angle, and headrest position can be modified by the user. These adjustable elements are integrated into the molded shell structure, allowing the seat to adapt to different user preferences and positions while maintaining a simple single-piece construction that reduces assembly complexity.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentEP3915828B1Vehicle seat assembly and vehicle
Publication Date: 2026.04.08 AUTOLIV DEV AB
  • EP3915828B1 patent drawingFigure 1(a)~2
  • EP3915828B1 patent drawingFigure 3

AI summary

Provided are a vehicle seat assembly and a vehicle. The assembly is mounted within a vehicle cabin of a vehicle (100) and includes a vehicle seat (11) and a side airbag device (12), the vehicle seat (11) including a seat backrest (111) and a seat base (112), the seat backrest (111) being connected to the seat base (112) in such a manner as to be movable relative to the seat base (112) in a front-rear direction of the vehicle (100). The side airbag device (12) is arranged on the vehicle seat (11) and includes: a first side airbag (121) and a second side airbag (122) that are not in fluid communication with each other and are configured to be deployed between the vehicle seat (11) and a side wall of the vehicle (100) when in an inflated and expanded state; a controller for determining the orientation of the vehicle seat (11) and detecting an impact signal to output a control signal; and a gas generator for generating, based on the control signal of the controller, a gas to inflate the first side airbag (121) or the second side airbag (122), such that the first side airbag (121) is deployed if the vehicle seat (11) faces the front of the vehicle (100) and the second side airbag (122) is deployed if the vehicle seat (11) faces the rear of the vehicle (100).