EV Cabin Vent Closure Control for Fire Isolation and Ventilation
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Solution Overview
Problem
The transition to electric vehicles (EVs) presents a conflict between the need to isolate the cabin from the power cell to prevent ingress of fire, flames, heat, gases, or smoke and the need to ventilate the cabin to remove undesirable gases produced by occupants or cooking equipment, as traditional ventilation apertures in the floor are not compatible with EV design.
Innovation Solution
A system and method to control the closure of a cabin vent based on the operational mode of the vehicle and the operational state of the power cell, using mechanisms like pyrotechnic latches, heat-deformable latches, and electronic control units to manage vent closure during different modes and failure events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a solid floor without apertures is provided to isolate the cabin from the power cell, then protection from ingress of fire, flames, heat, gases, and smoke is improved, but cabin ventilation capability deteriorates
Solution Approach 1:
The floor is segmented into a solid portion and a movable vent portion. The vent can be opened to allow gas egress while closed to prevent harmful substance ingress, thus resolving the contradiction between ventilation and protection requirements
Solution Approach 2:
The vent is designed as a dynamic component that can change its state between open and closed positions. This dynamic capability allows the system to adapt to different operational requirements, providing ventilation when needed and protection when the power cell is active
2Ease of operation
If a ventilation aperture is provided in the floor to allow gas egress, then cabin ventilation is improved, but protection from ingress of harmful substances deteriorates
Solution Approach 1:
The floor structure is divided into sealed portions and a dedicated vent aperture. This segmentation allows the aperture to serve its ventilation function while the surrounding sealed floor maintains protection against harmful substance ingress
Solution Approach 2:
The vent acts as an intermediary element between the cabin interior and the power cell area. It provides a controlled pathway for gas egress while its closed state serves as a barrier against harmful substances, mediating between the conflicting requirements
3Reliability
If the cabin is completely isolated from the power cell area, then safety from fire and heat ingress is improved, but passive ventilation capability deteriorates
Solution Approach 1:
The isolation between cabin and power cell area is made dynamic through the movable vent. The system transitions from complete isolation (when vent is closed for safety) to controlled connection (when vent is open for passive ventilation), resolving the contradiction between safety and ventilation productivity
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
Simultaneously achieves cabin ventilation and protection from ingress of harmful substances by intelligently controlling the cabin vent to open or close based on vehicle mode and power cell state, ensuring safety and comfort.
Implementation Method 1
a pyrotechnic latch releasing a biased member, that is biased towards occluding the cabin vent
Implementation Method 2
heat-deformable latches, and electronic control units to manage vent closure
Data Source
AI summary
Systems and methods of controlling the ventilation of an electric vehicle comprising a power cell and a cabin vent. An operational mode of the electric vehicle is determined. An operational state of the power cell is determined. The closure of the cabin vent is controlled based on the operational mode of the electric vehicle and the operational state of the power cell.