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Prediction Method Of Induction Swirl Parameters For Dual Inlet Port Of DI Diesel Engine And Its Application To Engine Performance Improvement
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Event:
22nd FISITA Congress
Language:
English
Abstract
For passenger vehicles with direct injection (DI) diesel engines, it is desirable for the engine to have high speed and high power output performance comparable to that of gasoline engines, yet maintaining its good fuel economy. Accordingly, we examine a dual inlet port system, which operates both valves simultaneously at high engine speed to improve the volumetric efficiency but operates only one valve at low engine speed to obtain the optimum swirl ratio (SR). The swirl ratio with two valve operation (SR1+2) is affected by SR and the mean effective valve area (Zm) of each valve. Therefore, with experimental technique, it is difficult to find port configurations which are optimum for both high and low engine speeds simultaneously. We have employed a predictive method to obtain the optimum configurations. This paper describes how to derive the predictive equation of SR1+2 from the SR and Zm of each valve for the optimum intake system design. To examine the accuracy of the equation, predicted values were compared with measured values. The results show good agreement for practical applications. Moreover, a single cylinder engine with this system shows a reasonable improvement on the power output and fuel consumption.
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Authors
Topic
Citation
Hasegawa, S. and Takahashi, Y., "Prediction Method Of Induction Swirl Parameters For Dual Inlet Port Of DI Diesel Engine And Its Application To Engine Performance Improvement," SAE Technical Paper 885101, 1988, https://doi.org/10.4271/885101.Also In
References
- Shigemori M. Tsuruoka S. Shimoda M. “Development a Combustion System for a Light Duty D.I. Diesel Engine” SAE Paper 831296
- Partington G.D. “Analysis of steady flow tests on inlet and exhaust ports” Ricardo Consulting Engineers, Report DP.80/1123 1980-7
- Tippleman G. “A New Method of Investigation of Swirl Ports” SAE Paper 770404
- Pischinger F. “Entwicklungsarbeiten an einem Verbrennungssystem für Fahrzeugdieselmotoren” ATZ 00 1963
- Ohashi R. “Combustion Characteristics of small DI Diesel Engine” Internal Combustion Engine 22 284 1983
- Shimada T. Sakai K. Kirihara S. “Variable Swirl Inlet System and its Effect on Diesel Performance and Emissions” SAE Paper 861185