Modeling and Validation of a Lean Burn Natural Gas Engine

Abstract

In this paper, a control-oriented model of a medium-duty throttle-body natural gas engine is developed. The natural gas engine uses lean-burn technology without exhaust gas recirculation (EGR). The dynamic engine model differs from models of gasoline engines by including the natural gas fuel dynamics in the intake manifold. The model is based on a mean value concept and has three state variables: intake manifold pressure, fuel fraction in the intake manifold and the engine rotational speed. The resulting model has been validated in steady-state and transient operation over the usual operating range of the engine between 800 rpm and 2600 rpm with air/fuel ratios ranging between 18.0 and 24.0.

Shock-tube study of methane ignition under engine-relevant conditions: experiments and modeling

“…The increasing popularity of natural-gas-fueled internal combustion engines [1][2][3] raises the importance of predicting autoignition of natural gas under various operating conditions. Early experimental measurements of the ignition delay of methane, a major component of natural gas, were mostly conducted under low-pressure (0.5-15 atm), high temperature (1200-2500 K) [4][5][6][7][8][9], and/or highly dilute conditions (with over 90% Ar) [10].…”

Control design-oriented modeling and µ-synthesis-based robust multivariate control of a turbocharged natural gas genset engine

“…Previous research in Gangopadhyay and Meckl 19 on thermal efficiency reveals that engine thermal efficiency can be modeled in terms of AFR and spark advance angle. This study adopts this idea, and realizes that AFR is a function of cylinder charge flow W cyl and fuel mass flow u 3 , as indicated by equation (9).…”

Banshee distribution network benchmark and prototyping platform for hardware‐in‐the‐loop integration of microgrid and device controllers

“…8. The engine incorporates response characteristics of a natural gas generator presented in [37] supported with validated dynamic data for a 350‐horsepower machine. Details include valve assembly, throttle body, intake manifold, and engine block.…”