This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Air Charge Estimation in Camless Engines
Technical Paper
2001-01-0581
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
An electromechanically driven valve train offers unprecedented flexibility to optimize engine operation for each speed load point individually. One of the main benefits is the increased fuel economy resulting from unthrottled operation. The absence of a restriction at the entrance of the intake manifold leads to wave propagation in the intake system and makes a direct measurement of air flow with a hot wire air meter unreliable. To deliver the right amount of fuel for a desired air-fuel ratio, we therefore need an open loop estimate of the air flow based on measureable or commanded signals or quantities. This paper investigates various expressions for air charge in camless engines based on quasi-static assumptions for heat transfer and pressure.
Recommended Content
Authors
Citation
van Nieuwstadt, M., Kolmanovsky, I., Haghgooie, M., and Hammoud, M., "Air Charge Estimation in Camless Engines," SAE Technical Paper 2001-01-0581, 2001, https://doi.org/10.4271/2001-01-0581.Also In
References
- Pischinger M. Salber W. van der Staay F. Baumgarten H. Kemper H. “Benefits of the Electromechanical Valve train Operation” SAE paper 2000-01-1223
- Konzelmann U. Hecht H. Lembke M. “Breakthrough in Reverse Flow Detection- A New Air Flow Meter Using Micro Silicon Technology” SAE paper 950433
- Taylor C.F. “The Internal Combustion Engine in Theory and Practice” 1 Thermodynamics, Fluid Flow, Performance 1966
- Fox J.W. Cheng W.K. Heywood J.B. “A model for predicting residual Gas Fraction in Spark-Ignition Engines” SAE paper 931025
- Hammoud M. Haghgooie M. “Evaluation of an Electromechanical Valve Actuation System on a 2.0 Liter 4 Valve Zetec Ford Engine” Variable Valve Timing Congress Essen 2000
- Hohenberg G. “Advanced approaches for heat transfer calculations” SAE paper 790825
- Heywood J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill Inc 1988