Automotive air-conditioning servicing system and method

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62126, 62129, 62149, F25B 4500




Method and apparatus for servicing air-conditioning systems employing electronic processing means for initially diagnosing the air-conditioning system and, thereafter, if tests or repairs are needed, for guiding the mechanic to correction of its defective operation and for charging the system with refrigerant and oil. The apparatus, according to a preferred embodiment, includes a microprocessor operable in three modes: a "system selection" mode during which the type of system being serviced is identified; a "diagnose" mode during which the microprocessor receives signals indicative of the high and low side pressures of the air-conditioning system and develops a list of possible causes of system malfunction, and a "charging" mode during which the microprocessor automatically charges the system with the desired amount of refrigerant and oil. The apparatus further includes means controlled by the microprocessor for automatically compensating for changes in the viscosity and temperature and, hence, of the flow rate of the oil to ensure the air-conditioning system will always be correctly filled. The invention permits accurate diagnosis and repair to be carried out by relatively inexperienced personnel in a straightforward, efficient manner.

patent: 3873289 (1975-03-01), White
patent: 4114448 (1978-09-01), Merritt
patent: 4285206 (1981-08-01), Koser
patent: 4325223 (1982-04-01), Cantley
patent: 4381549 (1983-04-01), Stamp, Jr. et al.
patent: 46214112 (1986-11-01), Proctor
Brochure entitled "Auto Air Service Center Operator's Manual".
Brochure entitled "Could Your Business Stand an Increase in Its Profit Potential", describing the Model 01016 Auto Air Service Center III, White Industries.
Brochure entitled "Automatic Air Conditioning Service Station"-Robinair Division-Sealed Power Corporation.
Brochure entitled "Automotive Air Conditioning Service Center Draf Hi-Tech 1250" Draf Industries, Inc.
Brochure entitled "Automotive Test Equipment Catalog Instruments of the Eighties", TIF Industries, Inc.
Training Manual, Automotive Air-Conditioning Basic Service, 1985 Edition, pp. 115-139, White Industries, Inc.


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