DEVICE DIAGNOSIS DEVICE, FREEZING CYCLE DEVICE, FLUID CIRCUIT DIAGNOSIS METHOD, DEVICE MONITORING SYSTEM, AND FREEZING CYCLE MONITORING SYSTEM

Title:

DEVICE DIAGNOSIS DEVICE, FREEZING CYCLE DEVICE, FLUID CIRCUIT DIAGNOSIS METHOD, DEVICE MONITORING SYSTEM, AND FREEZING CYCLE MONITORING SYSTEM

Document Type and Number:

WIPO Patent Application WO/2005/071332

Kind Code:

A1

Abstract:

A conventional trouble diagnosis device for a freezing cycle has a bad accuracy since fluid is handled and has a problem that it cannot predict a trouble symptom, cannot absorb an individual difference in trouble judgment, or cannot identify the trouble cause. There has not been a practical diagnosis device or method which can be achieved at a reasonable cost. There is provided a device diagnosis device for detecting a plurality of measurement amounts associated with a coolant such as pressure and temperature of a freezing cycle device, calculating a state amount such as a composite variable from these measurement amounts, and judging whether the device is normal according to the calculation results. By making the device learn during normal operation, it is possible to judge the current state. By forcibly making the device perform abnormal operation to learn, or calculate an abnormal operation state during the current operation, it becomes possible to predict a trouble such as an operation limit from change of the distance of Mahalonobis. Thus, it is possible to realize a reliable diagnosis with a simple configuration.

Inventors:

YAMASHITA KOJI (JP)
TOYOSHIMA MASAKI (JP)
NAKATA HIROSHI (JP)

Application Number:

PCT/JP2004/018918

Publication Date:

August 04, 2005

Filing Date:

December 17, 2004

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)
YAMASHITA KOJI (JP)
TOYOSHIMA MASAKI (JP)
NAKATA HIROSHI (JP)

International Classes:

F24F11/00; F24F11/02; F25B49/00; F25B49/02; G01M99/00; (IPC1-7): F25B49/02; F24F11/02; G01M19/00

Foreign References:

JP2003315211A	2003-11-06
JPH0540115A	1993-02-19
JP2002195718A	2002-07-10

Other References: