Constant velocity air inlet controller

R. S. Gates, D. G. Overhults, B. L. Walcott, S. A. Shearer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The experimental implementation of a microprocessor-based controller to adjust the width of hinged baffled slot inlets is described. The system was designed to utilize a velocity sensor which output a digital pulse train proportional to the air velocity as the feedback mechanism to the controller. The controller adjusted the slot width as necessary to maintain a setpoint velocity within a specified deadband. Results, in terms of system response to a step change in either air flow rate (such as additional fans turning on), or to a step change in setpoint velocity, are presented. An analysis of this nonlinear control system resulted in the characterization of the system response in terms of a linear, second-order model. To illustrate a means for further improvement in controller response, the design of a lead compensator cascaded to the original controller is discussed. This method of control is believed to have several advantages compared with current air inlet controllers.

Original languageEnglish
Pages (from-to)175-190
Number of pages16
JournalComputers and Electronics in Agriculture
Issue number2
StatePublished - Oct 1991

ASJC Scopus subject areas

  • Forestry
  • Agronomy and Crop Science
  • Computer Science Applications
  • Horticulture


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