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CONDITIONAL FLOOR LEVEL EXTRACT OF COLD MOIST AIR

IP.com Disclosure Number: IPCOM000012392D
Publication Date: 2003-May-03
Document File: 5 page(s) / 319K

Publishing Venue

The IP.com Prior Art Database

Abstract

A system for selective and/or conditional extraction of cold, moist air is disclosed. The system includes sensors that open a ventilation port based on temperature and/or humidity to extract cold, moist air from areas of a vehicle (such as from the foot wells).

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CONDITIONAL FLOOR LEVEL EXTRACT OF COLD MOIST AIR

Abstract

         A system for selective and/or conditional extraction of cold, moist air is disclosed. The system includes sensors that open a ventilation port based on temperature and/or humidity to extract cold, moist air from areas of a vehicle (such as from the foot wells).

Background

         It is generally known to provide for a vehicle ventilation system that extracts air at floor level for the purpose of removing cold moist air before it mixed with cabin air. However, ports for such known system are typically always open and the extraction was not conditioned on temperature or moisture in the air.

Description

         A primary feature of the present invention is to provide a system and method for extracting cold, moist air from a vehicle compartment or cabin that overcomes the above-noted disadvantages.

         Another feature of the present invention is to provide extraction of air from a vehicle based on the moisture content and/or the temperature of the air.

         Another feature of the present invention is to provide selective extraction of air from selective areas of the vehicle, such as the foot wells or the like.

         Another feature of the present invention is to provide temperature and humidity sensors at floor level as feedback to trigger local extract of cold moist air from slush or wet shoes, with the intention of reducing the "demist" load on a vehicles HVAC system.

         As shown in the drawing below, a ventilation system includes a port (e.g., vent), temperature sensor, humidity sensor.

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         An exemplary feedback control loop 10 for a heating, ventilation and air conditioning (HVAC) system is shown in FIGURE 1. Control loop 10 includes a conventional feedback controller 12 that produces a control signal u in response to a deviation of the controlled variable y from a desired set-point SP. The control signal u is applied to a switching law 14 positioned between the feedback controller 12 and a controlled system 16 (e.g., the foot well area of a vehicle). The switching law 14 responds to the control signal u by producing a pulsed output signal h (i.e., a sequence, in time, of on and off epochs) that turns the discrete devices of the controlled system 16 on and off.

         The controllers for the system operate based on sensing a variable or parameter (i.e., a "controlled variable") in the controlled area. In the present system, the variables are temperature and humidity (or moisture).

         The HVAC system includes vehicle ventilation equipment that supplies heated or cooled air to one or more controlled spaces or target zones of a vehicle. The system may also be a separate system that operates independently from the vehicle's main HVAC system. In the foot well area, moisture (e.g., snow, slush, water, etc.) on an occupant's footwear evaporates to the passenger compartment and may condense on the windows. In known vehicle HVAC systems, to remove moisture from the windows, the thermal output of the HVAC system is...