Effect of Sac Volume on Injector Performance 920680
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.
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. Download Citation
Author(s):
Thomas Dreeben, Larry Millen, Marvin Wells, James Woolworth
Affiliated:
Ford Motor Co.
Pages: 14
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1992 Transactions: Journal of Engines-V101-3
Related Topics:
Throttles
Manifolds
Valves
Vacuum
Seats and seating
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