Filter purge control for HVAC variable air circulation system

Details Filter purge control for HVAC variable air circulation system Filter purge control for HVAC variable air circulation system

2008-05-27

2008-05-27

McAllister, Steven B. (Department: 3749)

Ventilation

Vehicle

Having inlet airway

C454S137000, C296S190090

Reexamination Certificate

active

07377848

ABSTRACT:
A variable air circulation system for the cab enclosure of an off-highway vehicle is disclosed and described. The system provides for adjustment of the ratio between fresh air circulation and recirculation of cab air. Fresh air is introduced into the cab through a fresh air inlet having a fresh air filter therein. The air inlet leads to a circulation conduit. When a cab door is opened, a valve to the conduit is opened. When the door is closed, the air pulse created in the cab is effective, through the valve, to dislodge dust and dirt from the filter.

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