Cabin Air Treatment Layout for Overpressure Without Extra Fans
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Solution Overview
Problem
Existing air treatment systems for vehicle cabins, particularly in agricultural machines, face constraints due to the large footprint, high cost, and energy consumption of additional fans required for air pressurization, as well as potential operational failures if filtration devices become clogged.
Innovation Solution
An air treatment system that integrates a single fan within the HVAC unit, with dual filtration levels and a recirculation port, controlled by a valve assembly and electronic control unit to manage air flow and filtration levels, allowing for adjustable external air intake and recirculation to maintain overpressure while minimizing system size, cost, and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an additional fan is disposed directly downstream of the first filtration device to pressurize incoming outside air, then the share of filtered air from outside supplied into the cabin is significantly increased, but the system footprint, cost, and energy consumption increase significantly
Solution Approach 1:
The patent merges the function of the additional pressurization fan with the existing air conditioning device fan. The single fan located in the air conditioning device performs both the air conditioning function and the pressurization function, eliminating the need for a separate additional fan. This combination reduces system footprint, cost, and energy consumption while maintaining the capability to supply sufficient filtered outside air to the cabin.
2Stress or pressure
If an additional fan is disposed directly downstream of the first filtration device, then outside air pressurization is achieved, but the layout of the air treatment system is significantly constrained
Solution Approach 1:
The patent combines the pressurization function with the existing air conditioning device, allowing the fan to be positioned within the air conditioning unit rather than requiring a specific position downstream of the first filtration device. This merging of functions provides layout flexibility and reduces structural constraints on the air treatment system design.
3Productivity
If the maximum prevalence of the additional fan is used, then outside air intake is maximized, but system operation may fail if the filtration device is clogged
Solution Approach 1:
The patent implements dynamic control of the single fan's operation through an electronic control unit that monitors system conditions and adjusts fan speed accordingly. This dynamic adjustment allows the system to optimize outside air intake when filtration is normal while reducing fan speed or shutting down when filtration devices become clogged, preventing system failure and improving operational reliability.
Solution Approach 2:
The system incorporates feedback control through the electronic control unit that monitors the operation status and adjusts fan performance based on real-time conditions. This feedback mechanism ensures the fan operates at optimal prevalence levels while responding to filtration device status, maintaining reliability even when outside air intake needs to be maximized.
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 effectively manages air flow and filtration levels to maintain cabin overpressure, reduces system dimensions and energy use, and allows for flexible operation including total external air supply or exclusion, ensuring reliable performance even with filtration device malfunctions.
Implementation Method 1
an air conditioning device located inside the box, provided with a fan
Implementation Method 2
a first filtration device, having a first filtration level, carried by the box and disposed downstream of the first inlet opening to filter external air entering the box itself
Data Source
AI summary
An air treatment system is described, for a closable room of a vehicle, comprising: an air conditioning device provided with a fan and connectable to the room; an inlet opening for outside air, connected to the air conditioning device; a filtration device for filtering the outside air entering from the inlet opening; a recirculation port; a valve assembly provided with a shutter member, interposed between the inlet opening, the recirculation port and the air conditioning device and movable between a plurality of operating positions, in which it varies the shares of air coming from the inlet opening and the recirculation port; and a control unit to adjust the operating position of the shutter member so as to control the shares of air being drawn from the inlet opening and from the recirculation port and to maintain a predetermined value of overpressure in the room with respect to the outside.