TECHNICAL PAPERS: Internal Combustion Engines

Application of Controllable Electric Coolant Pump for Fuel Economy and Cooling Performance Improvement

[+] Author and Article Information
Hoon Cho, Dohoy Jung, Zoran S. Filipi, Dennis N. Assanis

Mechanical Engineering, The University of Michigan, Ann Arbor, MI 48109

John Vanderslice

 Ford Motor Company, Dearborn, MI 48124

Walter Bryzik

 U.S. Army Tank-Automotive Research, Development & Engineering Center, Warren, MI 48397

J. Eng. Gas Turbines Power 129(1), 239-244 (Jan 09, 2006) (6 pages) doi:10.1115/1.2227035 History: Received March 31, 2005; Revised January 09, 2006

The engine cooling system for a typical class 3 pickup truck with a medium duty diesel engine was modeled with a commercial code, GT-Cool, in order to explore the benefit of a controllable electric pump on the cooling performance and the pump operation. As the first step, the cooling system model with a conventional mechanical coolant pump was validated with experimental data. After the model validation, the mechanical pump submodel was replaced with the electric pump submodel, and then the potential benefit of the electric pump on fuel economy was investigated with the simulation. Based on coolant flow analysis, a modified thermostat hysteresis was proposed to reduce the recirculating flow and the electric pump effort. It was also demonstrated that the radiator size could be reduced without any cooling performance penalty by replacing the mechanical pump with the electric pump. The predicted results indicate that the cooling system with the electric pump can dramatically reduce the pump power consumption during the FTP 74 driving schedule and that the radiator can be downsized by more than 27% of the original size, under the grade load condition.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Schematic diagram of V6, 4.5l diesel engine with its cooling system

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Figure 2

Complete conventional cooling system model

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Figure 3

Engine transient duty cycle corresponding to the Federal Urban Vehicle Schedule

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Figure 4

Comparison of temperature predictions and measurements during the FTP 74 driving cycle

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Figure 5

Predicted coolant mass flow rates during the FTP 74 driving cycle

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Figure 6

Comparison of mechanical and electric coolant pump efficiencies

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Figure 7

Comparison of coolant temperature at the exit of engine block between mechanical and electric pumps during the FTP 74 driving cycle

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Figure 8

Predicted coolant mass flow rates with the electric coolant pump during the FTP 74 driving cycle

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Figure 9

Modification of thermostat hysteresis

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Figure 10

Predicted coolant mass flow rates toward the electric coolant pump inlet with the modified thermostat hysteresis

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Figure 11

The effect of thermostat hysteresis on the engine wall temperature

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Figure 12

Comparison of coolant pump power consumption during the FTP 74 driving cycle

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Figure 13

Investigation of cooling capacity of each cooling system with original size radiator

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Figure 14

Evaluation of the possibility of radiator downsizing




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