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Effect of Sac Volume on Injector Performance
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English
Abstract
The “Sac” is a small volume within the fuel flow path of an electronic fuel injector. In this study, it is defined as the volume between the valve seat (fuel shut off point) and the entrance to the final metering orifice of the injector. This sac causes fuel injectors to deliver uncalibrated excess fuel when the engine is operated under closed throttle, high manifold vacuum conditions such as vehicle decelerations or idle. This paper describes a simple mass balance model used to predict the effect of the sac volume on injector fuel delivery under extreme operating conditions. The model prediction compares directly with experimental results for injectors with different sac volumes.
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Authors
Citation
Dreeben, T., Millen, L., Wells, M., and Woolworth, J., "Effect of Sac Volume on Injector Performance," SAE Technical Paper 920680, 1992, https://doi.org/10.4271/920680.Also In
References
- Glockler, Otto “Present Status and Future Development of Gasoline Fuel Injection Systems for Passenger Cars,” SAE Paper 800467 1980
- Nogi, Toshiharu “Mixture Formation of Fuel Injection Systems in Gasoline Engines,” SAE Paper 880558 1988
- Andrighetti, James P. “Design-Development of the Lucas CAV Multipoint Gasoline Injector,” SAE Paper 870127 1987
- Kashiwaya, Mineo “The effect of Atomization of fuel injectors on engine performance,” SAE Paper 900261 1990