Engine Compartment Air Management for Engine Cooling and Air Conditioning System Performance

David Martin; Refki El-Bourini

doi:10.4271/911933

1991-09-01

Engine Compartment Air Management for Engine Cooling and Air Conditioning System Performance 911933

Engine Cooling and Air Conditioning tests were performed using a sports utility vehicle with a V-6 engine. The original vehicle was equipped with an engine driven fan. This vehicle was modified by adding electric motor driven fans, air path sealing and advanced heat exchangers in a predetermined test configuration. Engine cooling performance and air conditioning performance were evaluated at each step. Identical grade load and idle tests were conducted with this vehicle at each step.

The V-6 sports utility vehicle was selected due to its use of an engine driven fan. The grade load of 8.7% was selected due to off road use by the consumers.

The results of the testing showed that engine cooling performance and air conditioning performance were improved by using electric motor driven fans, air path sealing and advanced heat exchangers. This improvement was demonstrated both on the grade and during idle immediately following the grade accordingly:

lower coolant temperature
lower coolant system pressure
lower transmission oil temperature
lower engine oil temperature
lower vent outlet temperature
lower compressor suction pressure
lower compressor discharge pressure
higher engine compartment air flow.

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Engine Compartment Air Management for Engine Cooling and Air Conditioning System Performance 911933

SAE MOBILUS