This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Application of a New Combustion Concept to Direct Injection Gasoline Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
A direct injection (DI) gasoline engine having a new stratified charge combustion system has been developed. This new combustion process (NCP) was achieved by a fan-shaped fuel spray and a combustion chamber with a shell-shaped cavity in the piston. Compared with the current Toyota D-4 engine, wider engine operating area with stratified combustion and higher output performance were obtained without a swirl control valve (SCV) and a helical port. This report presents the results of combustion analyses to optimize fuel spray characteristics and piston cavity shapes. Two factors were found to be important for achieving stable stratified combustion.
The first is to create a ball-shaped uniform mixture cloud in the vicinity of the spark plug. The optimum ball-shaped mixture cloud is produced with a fuel spray having early breakup characteristics and uniform distribution, and a suitable side wall shape in the piston cavity to avoid the dispersion of the mixture.
The second factor is to reduce the over-lean area in the piston cavity. A compact shell-shaped cavity was designed for this purpose. The resulting flame propagation improves combustion stability.
The effect of tumble motion was also investigated. The best combustion characteristics were obtained at weak tumble motion condition. Measurement results of in-cylinder flow by LDV showed that the fan-shaped fuel spray produces sufficient turbulence strength without extra intake air flow systems.
The application of the NCP to an actual 3L in-line 6 DI gasoline engine showed that in addition to satisfying Japanese regulations which start in from 2000, a fuel economy gain of more than 20% was obtained.
|Research and Development of a New Direct Injection Gasoline Engine
|Development of Direct Injection Gasoline Engine
|Slit Nozzle Injector for A New Concept of Direct Injection SI Gasoline Engine
CitationKanda, M., Baika, T., Kato, S., Iwamuro, M. et al., "Application of a New Combustion Concept to Direct Injection Gasoline Engine," SAE Technical Paper 2000-01-0531, 2000, https://doi.org/10.4271/2000-01-0531.
- Alperstein, M. Schafer, G. Villforth, F. “Texaco's Stratified Charge Engine_Multifuel, Efficient, Clean and Practical,” SAE 740563
- Scussel, A. Simko, A. Wade, W. “The Ford PROCO Engine Update,” SAE 780699
- Schäpertöns, H. Emmenthal, K.-D. Grade, H.-J. Oppermann, W. “VW's Gasoline Direct Injection (GDI) Reserch Engine,” SAE 910054
- Harada, J. Tomita, T. Mizuno, H. Mashiki, Z. Ito, Y. “Development of Direct Injection Gasoline Engine” SAE 970540
- Matsusita, S. et al. “Effect of Helical Port with Swirl Control Valve on Combustion and Performance of S.I. Engine,” SAE 850046
- Nakanishi, K. et al. “Development of a New Intake System for a 4-valve Lean Burn Engine,” 1992