Diagnosis apparatus for air transfer apparatus and method thereof
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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Abstract
An air pump is driven under a condition where a check valve is not opened, and an occurrence of failure in the check valve and the air pump is diagnosed based on a driving load of the air pump or a pressure upstream of the check valve or a pressure downstream of the check valve at the time.
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Citations
27 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10)
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8. 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:
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a drive unit that drives said air pump under a condition where said check valve is held in a closed state; a transfer state detector detecting a transfer state of the 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 transfer state of the air detected by said transfer state detector, when said air pump is driven by said drive unit, wherein said transfer state detector detects a pressure in the transfer passage between said air pump and said check valve, and also detects a pressure in said shielded section, and wherein said diagnosis unit; judges whether or not the pressure in said shielded section is changed in synchronism with the drive of said air pump, when the pressure in the transfer passage between said air pump and said check valve is not changed up to a predetermined pressure; judges an occurrence of failure in said check valve, when the pressure in said shielded section is changed in synchronism with the drive of said air pump; and judges an occurrence of failure in said air pump, when the pressure in said shielded section is not changed in synchronism with the drive of said air pump.
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11. 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:
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a drive unit that drives said air pump under a condition where said check valve is held in a closed state; a transfer state detector detecting a transfer state of the 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 transfer state of the air detected by said transfer state detector, when said air pump is driven by said drive unit, wherein said check valve includes; a resilient body applying on a valve body an urging force for valve closing which is equal to or larger than a maximum generated pressure by said air pump; and an actuator generating a valve opening force against the urging force for valve closing by said resilient body. - View Dependent Claims (12, 13)
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14. A diagnosis apparatus for an air transfer apparatus which includes an air pump for transferring air to a shielded section and a check valve disposed in a transfer passage between said shielded section and said air pump, comprising:
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drive means for driving said air pump to transfer an air with a pressure of less than valve opening pressure of a check valve; transfer state detecting means for detecting a state quantity which changes based on a transfer of air by said air pump; and diagnosis means for diagnosing whether or not a failure occurred in said air transfer apparatus based on the state quantity detected by said detecting means, when said air pump is driven by said drive means.
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15. A diagnosis method 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 the steps of:
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driving said air pump in order to transfer an air with a pressure of less than valve opening pressure of a check valve; detecting a state quantity which changes based on a transfer of air by said air pump; and diagnosing whether or not a failure occurred in said air transfer apparatus based on said state quantity. - View Dependent Claims (16, 17, 18, 19, 20, 21, 23, 24)
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22. A diagnosis method 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 the steps of:
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driving said air pump under a condition where said check valve is held in a closed state; detecting a transfer state of the air by said air pump; and diagnosing whether or not a failure occurred in said air transfer apparatus based on the transfer state of the air, wherein said step of detecting the transfer state comprises the steps of; detecting a pressure in the transfer passage between said air pump and said check valve; and detecting a pressure in said shielded section, and wherein said step of diagnosing the occurrence of failure comprises the steps of; judging whether or not the pressure in said shielded section is changed in synchronism with the drive of said air pump, when the pressure in the transfer passage between said air pump and said check valve is not changed up to a predetermined pressure; judging an occurrence of failure in said check valve, when the pressure in said shielded section is changed in synchronism with the drive of said air pump; and judging an occurrence of failure in said air pump, when the pressure in said shielded section is not changed in synchronism with the drive of said air pump.
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25. A diagnosis method 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 the steps of:
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driving said air pump under a condition where said check valve is held in a closed state; detecting a transfer state of the air by said air pump; and diagnosing whether or not a failure occurred in said air transfer apparatus based on the transfer state of the air, wherein said check valve includes; a resilient body applying on a valve body an urging force for valve closing which is equal to or larger than a maximum generated pressure by said air pump; and an actuator generating a valve opening force against the urging force for valve closing by said resilient body. - View Dependent Claims (26, 27)
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Specification