This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Fuel Effects on Throttle Transients in PFI Spark Ignition Engines
Annotation ability available
Sector:
Language:
English
Abstract
The fuel effects on throttle transients in PFI spark ignition engines were assessed through experiments with simultaneous step change of the throttle position from part load to WOT and increment of the injected fuel amount. The test matrix consisted of various gasoline/methanol blends from pure gasoline to pure methanol, coolant temperatures at 40C (for cold engine condition) and 80C (for warm engine), and different levels of fuel enrichment at the WOT condition. The x-τ model was used to interpret the engine GIMEP response in the transient. Using the model, a procedure was developed to calculate the parameters of the transient from the data. These parameters were systematically regressed against the fuel distillation points, the increment in injected fuel mass in the transient, and the enthalpy required to evaporate the fuel increment as the explanatory variables. While there was no significant correlations between the engine transient response to the fuel distillation points at 80C, there were such correlations at 40C. For both temperatures, the values of 1/τ and the change in the port liquid pool mass through the transient were linearly proportional to the increment of the injected fuel mass.
Recommended Content
Authors
Citation
Bossert, J., Shin, Y., and Cheng, W., "Fuel Effects on Throttle Transients in PFI Spark Ignition Engines," SAE Technical Paper 971613, 1997, https://doi.org/10.4271/971613.Also In
References
- Fozo, S.R. Aquino, C.F. “Transient A/F Characteristics for Cold Operation of a 1.6 Liter Engine with Sequential Fuel injection,” SAE Paper 880691 1988
- Oda, K. Hosono, K. Isoda, T. Aalhara, H. Kojima, K. Shibata, G. “Effect of Gasoline Composition on Engine Performance,” SAE Paper 930375 1993
- Chen, K.C. De Witte, K. Cheng, W.K. “A Species - Based Multi-Component Volatility Model for Gasoline,” SAE Paper 941877 1994