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FIDDLE-FREE AIR CONDITIONING PRESENTED AT SAE EXPO

 FIDDLE-FREE AIR CONDITIONING PRESENTED AT SAE EXPO
 DETROIT, Feb. 24 /PRNewswire/ -- Hot-blooded drivers may soon find a


way to keep cool in their cars with a lot less twiddling and fiddling with dashboard dials and levers.
 Toyota researchers reported on their air conditioning research at the 1992 SAE International Congress & Exposition, Feb. 24-28, in Detroit. Nearly 40,000 people are expected to attend.
 In experiments conducted in a climate-controlled environmental chamber, engineers developed and tested an air conditioning system for a car that relies for control on the skin temperature of the driver, rather than readings from several other sensors.
 The driver's skin temperature is measured by an infrared sensor mounted on the ceiling of the car above the windshield.
 A conventional car air conditioning system is controlled by a computer which receives readings from sensors measuring inside air temperature, solar radiation and the external air temperature. The computer then compares those readings to the target temperature set by the driver, and adjusts the air temperature accordingly.
 In their presentation at SAE's annual meeting, Toyota engineers argued that using room air temperature as a controlling index for an air conditioning system does not reflect the thermal state of a person.
 For example, they said, when a person enters a cool car from a hot outdoor environment, he or she does not feel as cool as a person who has been sitting in the car with the air conditioner running.
 The driver of a car with this new type of air conditioning would still need to set a target temperature, but that temperature would be based on the driver's skin temperature as measured by the infrared sensor, not a combination of other readings.
 Air conditioning has become virtually standard equipment on passenger cars, and as the demand grows for high-performance vehicles, said Toyota engineers, there is also a growing demand for improved thermal comfort.
 For further information on the SAE International Congress & Exposition, contat Debra Jacob, 313-393-4400, Ext. 3048, or 412-776-4841, Ext. 456 after Feb. 27.
 -0- 2/24/92
 /CONTACT: Barbara Pontello of SAE, 412-776-4841/ CO: Society of Automotive Engineers; SAE International Congress &
 Exposition; Toyota ST: Michigan IN: AUT SU: PDT


JG -- DE042 -- 1964 02/24/92 14:09 EST
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Date:Feb 24, 1992
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