MAINTENANCE TIMING DETERMINATION METHOD FOR VEHICULAR AIR CONDITIONER AND AIR CONDITIONER

Japanese Patent JP2015092121

A

PROBLEM TO BE SOLVED: To achieve a maintenance timing determination method hardly affected by individual difference of an air conditioner.SOLUTION: Signals from a pressure sensor and a temperature sensor on a coolant inlet side of a compressor and a pressure sensor and a temperature sensor on a coolant outlet side are fetched. Difference between a specific enthalpy at the compression start time and a specific enthalpy at the compression end time is calculated on the basis of these values. The calculated specific enthalpy difference is compared with a first set value and a second set value, respectively. When the specific enthalpy difference is larger than the second set value, the necessity of maintenance is displayed on a display device. When the specific enthalpy difference is larger than the first set value and smaller than the second set value, a refrigeration cycle graphic is prepared on a Mollier chart on the basis of the read value of the signal of each sensor. The refrigeration cycle graphic shown together with a refrigeration cycle graphic in a normal state which is prepared in advance and is stored in a storage device on the same Mollier chart is displayed on the display device.

AKAOGI TSUYOSHI
MURAKAMI SHUNSUKE
YOKOKURA AKIRA

JP2013231734A

May 14, 2015

November 08, 2013

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HIGASHI NIPPON RYOKAKU TETSUDO

F25B49/02; B61D27/00

JP2011064357A	2011-03-31
JP2008232580A	2008-10-02
JPS63297974A	1988-12-05
JPH0331667A	1991-02-12
JPH01174870A	1989-07-11
JPH02263074A	1990-10-25
JP2005132167A	2005-05-26

US20050061008A1

2005-03-24

Gwangyang International Patent Office

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