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HVAC fragrance system

  • US 9,352,063 B2
  • Filed: 04/09/2014
  • Issued: 05/31/2016
  • Est. Priority Date: 07/23/2013
  • Status: Active Grant
First Claim
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1. A system for injecting a fragrance into an airstream of an HVAC unit, the system comprising:

  • a structure configured to receive one or more fragrance sources;

    a fragrance system fan coupled to the structure and configured for attachment to ductwork of the HVAC unit such that the fragrance system fan is outside of the airstream of the HVAC unit, the fragrance system fan configured to move air past an active fragrance source of the one or more fragrance sources and then into the airstream of the HVAC unit; and

    a controller module including a user interface for receiving user input including a desired fragrance intensity level, the controller module configured to (i) receive an airflow input signal that indicates an amount of airflow in the airstream of the HVAC unit, (ii) determine a fragrance system fan speed signal in ratio to the airflow input signal and based on the desired fragrance intensity level, (iii) output the determined fragrance system fan speed signal to control a speed of the fragrance system fan, and (iv) periodically automatically adjust the fragrance system fan speed signal in response to a change of the airflow input signal or a change of the desired fragrance intensity level.

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