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Diagnosis apparatus for air transfer apparatus and method thereof

  • US 7,121,137 B2
  • Filed: 09/17/2004
  • Issued: 10/17/2006
  • Est. Priority Date: 09/22/2003
  • Status: Expired due to Fees
First Claim
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1. A diagnosis apparatus for an air transfer apparatus which includes an air pump transferring air to a shielded section and a check valve disposed in a transfer passage between said shielded section and said air pump, comprising:

  • a drive unit for driving said air pump to transfer air at a pressure less than a valve opening pressure of a check valve;

    a transfer state detector that detects a state quantity which changes depending on transferring of air by said air pump; and

    a diagnosis unit that diagnoses whether or not a failure occurred in said air transfer apparatus based on the state quantity detected by said transfer state detector, when said air pump is driven by said drive unit.

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