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Physical Model for Real-Time Simultaneous Estimation of Intake Mass and Cylinder Pressure in an SI Engine

[+] Author Affiliations
Shuonan Xu, Zhe Wang, Robert Prucka, Zoran Filipi

Clemson University, Greenville, SC

Michael Prucka, Hussein Dourra

FCA US LLC, Auburn Hills, MI

Paper No. ICEF2016-9396, pp. V001T05A007; 15 pages
  • ASME 2016 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2016 Internal Combustion Engine Division Fall Technical Conference
  • Greenville, South Carolina, USA, October 9–12, 2016
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 978-0-7918-5050-3
  • Copyright © 2016 by ASME and FCA US LLC


Stringent emission regulations require spark ignited (SI) engines to operate at stoichiometry to enable the use of a three way catalyst (TWC). Thus, accurate prediction of the intake charge mass flow rate is paramount. Current speed-density air mass-flow prediction techniques require extensive calibration for predicting volumetric efficiency, while mass air flow (MAF) meter based approaches suffer from a loss of accuracy during transients. This work aims to provide an alternative, i.e. a model based air charge estimation algorithm that can reduce calibration effort and provide a universal solution across engine platforms. An additional objective is to minimize the number of required sensors and associated cost. The foundation is established with a 0-D physics-based air charge model, where air flow through intake and exhaust valves is modeled on a crank-angle basis, without the need to measure in-cylinder pressure. The proposed algorithm solves differential equations for cylinder pressure and mass flow rate in/out of the cylinder to simultaneously obtain instantaneous pressure and mass-flow estimations, hence eliminating the need to install cylinder pressure transducers. An additional benefit is the robustness of the new model, due to its ability to self-compensate for an error in the intake runner pressure or initial estimation of the cylinder pressure. The model has been validated with GT-Power simulations and steady-state engine tests with multiple actuator sweeps. Transient tests and real-time implementations were performed as well.

Copyright © 2016 by ASME and FCA US LLC



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