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A Simulation Study of a Computer Controlled Cooling System for a Diesel Powered Truck
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Abstract
A set of control functions have been investigated for a computer controlled diesel cooling system, using the vehicle engine cooling system code. Various engine operating conditions such as the engine load, engine speed, and ambient temperature are considered as the controlling variables in the control loops. The truck simulated in the study was an International Harvester COF-9670 cab over chassis heavy-duty vehicle equipped with a standard cab heater, a Cummins NTC-350 diesel engine with a McCord radiator and standard cooling system components and after-cooler. The vehicle also had a Kysor fan-clutch and shutter system.
Comparison simulation tests between the conventional cooling system and the computer controlled cooling system using the Vehicle-Engine-Cooling Computer System model under different ambient and route conditions show that the computer controlled cooling system would offer the following benefits:
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1.
Increase of coolant, oil and engine wall metal temperature at low ambient temperature, and light route load conditions will be beneficial in increasing engine thermal efficiency.
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Higher oil temperature at low ambient temperature, during cold start, benefits faster temperature rise of the engine inner parts, which should reduce the engine wear. The control of oil temperature under variable load conditions should reduce the thermostress in the engine wall metal.
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Reduced fan engagement time at higher ambient temperature and heavier load conditions saves energy consumed by the fan.
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Water pump speed control shows the means to save power in driving the pump.
The validation of simulation results by experimenting with a computer controlled engine cooling system is presented in a companion paper.
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Xu, Z., Johnson, J., and Chiang, E., "A Simulation Study of a Computer Controlled Cooling System for a Diesel Powered Truck," SAE Technical Paper 841711, 1984, https://doi.org/10.4271/841711.Also In
References
- Wilkie Dennis F. “Automotive Electronic Issues for the 80's,” SAE Paper No. 811422 1981
- Toelle A.D. “Microprocessor Control of the Automobile Engine,” SAE Paper No. 770008 1977
- Chiang E. C. Ursini V. J. Johnson J. H. “Development and Evaluation of a Diesel Powered Truck Cooling System Computer Simulation Program,” SAE Paper No. 821048 1982
- Ursini V. J. Chiang E. C. Johnson J. H. “A Computer Cooling System Study of a Diesel Powered Truck for Control of Transient Coolant, Oil and Cab temperatures,” SAE Paper No. 821049 1982
- Xu Z. Johnson J. H. “The Design and Testing of a Computer Controlled Cooling System for a Diesel Powered Truck,” SAE Paper No. 841712 1984
- Savonen Craig L. Chiang Edward C. Johnson John H. “The Effects of Ambient temperature and Vehicle Load on a Diesel Powered Truck Cooling Sytstem Performance Using a Computer Simulation Program,” SAE Paper No. 841710 1984
- Sekar R. R. “Trends in Diesel Charge Air Cooling,” SAE Paper No. 820503 1982
- Rising Frank G. “Engine Cooling System Design for Heavy Duty Trucks,” SAE Paper No. 770023 1977
- Frank G. Teukel “Computer Simulation of Automotive Cooling System,” SAE Paper No. 740087 1974