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Development of Air-Assisted Injector System
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English
Abstract
In order to realize higher response and lower emissions for 4-valve engines, TOYOTA has researched ways to homogenize the air-fuel mixture in the combustion chamber as well as to reduce intake port wall-wetting. To achieve these items we have developed an air-assisted type two-hole injector (air-assisted injector) system which has improved both fuel atomization and spray directions. This system has been introduced to a 3Liter V-6 passenger car engine and mass produced.
The air-assisted injector atomizes the fuel by causing the air to collide and mix with the fuel. In order to obtain the air needed for atomization under all driving conditions, including idling, a new type idling speed control valve (ISCV) which has two air outlet passages has been developed. By means of this new ISCV, the new air-assisted injector system improves both fuel atomization and engine idling speed control during cold and hot engine conditions. This new system reduces hydrocarbon emissions, improves transient driveability and improves idling performances as a result of magnifying the area of fuel atomization.
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Authors
Citation
Harada, K., Shimizu, R., Kurita, K., Muramatsu, M. et al., "Development of Air-Assisted Injector System," SAE Technical Paper 920294, 1992, https://doi.org/10.4271/920294.Also In
References
- Iwata M. Furuhashi M. Ujihashi M. “Two-hole Injector Improves Performance and Exhaust Emissions of 4-valve Engines” SAE Paper 870125
- Nukiyama S. Tanasawa Y. “An Experiment on the Atomization of Liquid by means of an Air Stream” Trans. Soc. Mech. Engrs. (Japan) 4 1938
- Nagai N. et al. “Distribution Phenomena of a Liquid Film by Air Streams and Spray Characteristics” 8th Conference on Liquid Atomization and Spray Systems Japan 21 26 1980
- Manger H. “Electronic Fuel Injection” SAE Paper 820903
- Fozo S. Robert Aquino Charies F. “Transient A/F Characteristics for Cold Operation of a 1.6 Liter Engine with Sequential Fuel Injection” SAE Paper 880691
- Namiyama K. Nakamura H. Kokubo K. Hosogai D. “Deveropment of Ultrasonic Atomizer and Its Aprication to S. I. Engines” SAE Paper 890430
- Sugimoto T. Takeda K. Yoshizaki H. “Atomization of Air-Mix Type Two-Hole Injector for 4-Valve Engines” SAE Paper 912351
- Nogi T. Ohyama Y. Yamauchi T. “Effects of Mixture Formation of Fuel Injection Systems in Gasoline Engine” SAE Paper 891961