Research Papers: Internal Combustion Engines

A Study on an Automatically Variable Intake Exhaust Injection Timing Turbocharging System for Diesel Engines

[+] Author and Article Information
Shiyou Yang

Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706

Kangyao Deng, Yi Cui, Hongzhong Gu

School of Mechanical Engineering, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai 200030, China

J. Eng. Gas Turbines Power 132(5), 052803 (Mar 05, 2010) (7 pages) doi:10.1115/1.4000146 History: Received April 30, 2009; Revised May 24, 2009; Published March 05, 2010; Online March 05, 2010

A new turbocharging system, named automatically variable intake exhaust injection timing (AVIEIT), is proposed. Its main purpose is to improve the performance of low-speed high torque operating conditions and improve the economy of high-speed operating conditions for high-speed supercharged intercooled diesel engines. The principle of the AVIEIT turbocharging system is presented. A control mechanism for the proposed AVIEIT system used for a truck diesel engine is introduced. An engine simulation code has been developed. In this code, a zero-dimensional in-cylinder combustion model, a one-dimensional finite volume method-total variation diminishing model for unsteady gas flow in the intake and exhaust manifolds, and a turbocharger model are used. The developed code is used to simulate the performances of diesel engines using the AVIEIT system. Simulations of a military use diesel engine “12V150” and a truck diesel engine “D6114” using the AVIEIT system have been performed. Simulation results show that the in-cylinder charge air amount of the diesel engine with the AVIEIT system is increased at low-speed high torque operating conditions, and the fuel economy is improved at high-speed operating conditions. In order to test the idea of the AVIEIT system, an experiment on a truck diesel engine D6114 equipped with an AVIEIT control mechanism has been finished. The experiment results show that the AVIEIT system can improve the economy of high-speed operating conditions. Both the simulation and experiment results suggest that the AVIEIT system has the potential to replace the waste-gate and variable geometry turbocharger turbocharging systems.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Correlations between ηV and θIVC, n

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Figure 2

Valve timing variations of the AVIEIT system

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Figure 3

A selected control mechanism of the AVIEIT

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Figure 4

The energy conservation of in-cylinder

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Figure 5

Comparison between with the AVIEIT system and without the AVIEIT system: (a) excess combustion air ratio, (b) charge air pressure, (c) maximum in-cylinder pressure, (d) scavenging coefficient, (e) volumetric efficiency, and (f) brake specific fuel consumption

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Figure 6

Comparison between the AVIEIT system and the waste-gate system: (a) excess combustion air ratio, (b) charge air pressure, (c) maximum cylinder pressure, (d) exhaust gas temperature, (e) volumetric efficiency, and (f) brake specific fuel consumption



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