Vehicle Roof Lining Air Outflow Layout for Draft Reduction

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Solution Overview

Problem

Existing roof lining systems in vehicles cause passenger discomfort due to direct emission of conditioned air currents, which can irritate the eyes and lead to localized cooling or warming, especially when the air temperature differs significantly from the cabin temperature.

Innovation Solution

A roof lining system with central and peripheral outflow regions, each having separate air supply channels and flow actuators, allowing independent control of air currents to target different body regions, reducing drafts and irritation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conditioned air is emitted frontally onto passengers through conventional air outflow devices, then the air conditioning function is achieved, but passengers experience eye irritation and localized cooling/warming discomfort

Engineering Contradiction:

Improvepassenger discomfortVSAvoidair current distribution control

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The air outflow device is divided into multiple outflow regions (central and peripheral regions), each with separate air supply channels and independent flow actuators. This segmentation allows different body regions to receive air currents of different strengths, enabling precise control to avoid eye irritation while maintaining effective air conditioning.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different outflow regions are designed with different characteristics: the central outflow region targets the upper body and head, while the peripheral outflow region targets lower body regions. Each region can be independently adjusted to provide locally optimized air current strength, preventing discomfort in sensitive areas like the eyes while maintaining cooling efficiency.

Inventive Principle:

Principle #3Local quality

2Productivity

If the air temperature differs significantly from the passenger cabin temperature to provide effective cooling/heating, then air conditioning efficiency is improved, but passenger comfort deteriorates due to drafts and irritation

Engineering Contradiction:

Improveair conditioning efficiencyVSAvoiddrafts and irritation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system employs flow actuators that can dynamically adjust the air current strength in each outflow region independently. This allows the air conditioning system to maintain high efficiency by using temperature-differentiated air while dynamically controlling the flow strength to prevent drafts and irritation, adapting to different operational conditions and passenger needs.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If a single air supply channel is used for the entire outflow device, then the device structure is simple, but precise control of air currents to different body regions is not achieved

Engineering Contradiction:

Improvedevice structure simplicityVSAvoidair current targeting capability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The air supply system is segmented into separate air supply channels for the central and peripheral outflow regions, with independent flow actuators for each channel. This segmentation provides precise control capability to target different body regions while maintaining a relatively simple overall structure that can be manufactured efficiently.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system provides efficient air conditioning with reduced drafts and irritation, allowing for precise adjustment of air currents to different body regions, enhancing passenger comfort and simplifying production and recycling.

Implementation Method 1

Each outflow device also has at least two flow actuators, with at least one first flow actuator being assigned to the central outflow region and at least one second flow actuator being assigned to the peripheral outflow region

Methodology Applied

Scientific EffectFluid flow control:

Data Source

PatentUS12472802B2Roof lining system for motor vehicles with air conditioning function, and motor vehicle comprising roof lining system

Publication Date: 2025.11.18 KAUTEX TEXTRON GMBH & CO KG

AI summary

A roof lining system for motor vehicles, has an air supply connection for connecting the roof lining system to an air conditioning unit of the motor vehicle and at least one outflow device which is in fluid connection with the air supply connection. The outflow device has a central outflow region and a peripheral outflow region, which each have at least one separate air supply channel. Each outflow device has at least two flow actuators, with a first flow actuator being assigned to the central outflow region and a second flow actuator being assigned to the peripheral outflow region. The first flow actuator is arranged in the air supply channel of the central outflow region, and the second flow actuator is arranged in the air supply channel of the peripheral outflow region, and in that the peripheral outflow region at least partially surrounds the central outflow region.