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Browse Prior Art Database

Triple-Redundant Temperature Failure Detection

IP.com Disclosure Number: IPCOM000115115D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Cranston III, WV: AUTHOR [+5]

Abstract

Disclosed is the simultaneous use of three sensors to detect and predict over-temperature conditions in a computer system having a fan moving air through a filter to cool an internal compartment. A first sensor detects effective operation of the fan, a second sensor measures airflow, and a third sensor measures the temperature within the compartment.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 67% of the total text.

Triple-Redundant Temperature Failure Detection

      Disclosed is the simultaneous use of three sensors to detect
and predict over-temperature conditions in a computer system having a
fan moving air through a filter to cool an internal compartment.  A
first sensor detects effective operation of the fan, a second sensor
measures airflow, and a third sensor measures the temperature within
the compartment.

      A computer system in an industrial environment is often
subjected to high external ambient temperatures and particulate
environments, requiring the use of high-flow cooling fans together
with an input filter for cooling air.  While a single failure of a
cooling fan, or a clogged filter, may result in overheating the
system, a single sensor cannot provide sufficient information to
indicate the cause of the failure.  On the other hand, the order in
which the three sensors detect a failure condition can be used to
determine the cause of the failure.

      The Figure is a table showing the operation of the three
sensors following, in the first instance, a fan failure, and, in the
second instance, a filter failure.  In each case, the ambient
temperature is held at an acceptable level.  The failure of a fan is
detected first by the fan sensor, second by the airflow sensor, and
third, after enough time has passed without sufficient airflow, by
the temperature sensor in the compartment being cooled.  The failure
of the filter is detected first by the airflo...