Modeling and Validation of Automotive Engines for Control Algorithm Development

1992 ◽  
Vol 114 (2) ◽  
pp. 278-285 ◽  
Author(s):  
J. J. Moskwa ◽  
J. K. Hedrick
Keyword(s):  
Flow Rate ◽  
Control Algorithm ◽  
Front Wheel ◽  
Intake Manifold ◽  
Algorithm Development ◽  
Automotive Engine ◽  
Engine Model ◽  
Automotive Engines ◽  
Fuel Flow ◽  
Fuel Delivery

There is considerable interest in coordinated automotive engine/transmission control to smooth shifts, and for traction control of front wheel vehicles. This paper outlines a nonlinear dynamic engine model of a port fuel-injected engine, which can be used for control algorithm development. This engine model predicts the mean engine brake torque as a function of the engine controls (i.e., throttle angle, spark advance, fuel flow rate, and exhaust gas recirculation (E. G. R.) flow rate). The model has been experimentally validated for a specific engine, and includes: • intake manifold dynamics, • fuel delivery dynamics, and • process delays inherent in the four-stroke engine. This model is used in real time within a control algorithm, and for system simulation. Also, it is flexible enough to represent a family of spark ignition automotive engines, given some test and/or simulation data for setting parameters.

Coordinated control of fuel flow rate and air flow rate of a supersonic heat-airflow simulated test system

2020 ◽  
Vol 124 (1278) ◽  
pp. 1170-1189
Author(s):  
C. Cai ◽  
L. Guo ◽  
J. Liu
Keyword(s):  
Flow Rate ◽  
Control Algorithm ◽  
Air Flow ◽  
Coordinated Control ◽  
Test System ◽  
Gas Temperature ◽  
Air Flow Rate ◽  
Flow Rates ◽  
Fuel Flow ◽  
Simulated Test

ABSTRACTThe gas temperature of the supersonic heat airflow simulated test system is mainly determined by the fuel and air flow rates which enter the system combustor. In order to realise a high-quality control of gas temperature, in addition to maintaining the optimum ratio of fuel and air flow rates, the dynamic characteristics of them in the combustion process are also required to be synchronised. Aiming at the coordinated control problem of fuel and air flow rates, the mathematical models of fuel and air supply subsystems are established, and the characteristics of the systems are analysed. According to the characteristics of the systems and the requirements of coordinated control, a fuzzy-PI cross-coupling coordinated control strategy based on neural sliding mode predictive control is proposed. On this basis, the proposed control algorithm is simulated and experimentally studied. The results show that the proposed control algorithm has good control performance. It cannot only realise the accurate control of fuel flow rate and air flow rate, but also realise the coordinated control of the two.

A study on the high pressure EGR transport and application to the dispersion among cylinders in automotive engines

2020 ◽  
pp. 146808742096926
Author(s):  
José Galindo ◽  
Héctor Climent ◽  
Roberto Navarro ◽  
Julián Miguel-García ◽  
David Chalet ◽  
...  
Keyword(s):  
High Pressure ◽  
Tracking System ◽  
Intake Manifold ◽  
Specific System ◽  
Engine Torque ◽  
One Dimensional ◽  
Engine Model ◽  
Automotive Engines ◽  
Full Load Operation ◽  
Engine Map

The objective of this study is to explore the limits of a one-dimensional model to predict the movement and mixing of the air and exhaust gases recirculation (EGR) flows in compact intake manifolds of recent automotive engines. In particular, the high pressure EGR loop configuration is evaluated in this study from the perspective of the EGR dispersion among cylinders. The experimental work includes the use of a fast CO2 tracking system that provides crank-angle resolved results in six locations of the intake manifold together with the acquisition of the time-averaged CO2 concentration in all the intake pipes (eight locations) to evaluate the EGR dispersion empirically. A specific system was developed to inject the EGR in three locations of the intake manifold in a flexible way to modify the dispersion. Up to 29 engine running conditions defined by engine speed, engine torque and EGR rate, spanning the entire engine map, including full load operation, were evaluated. A one-dimensional engine model was built to detect the limits in reproducing the EGR transport in the intake manifold and quantify the accuracy when predicting the dispersion among cylinders. The study concludes that the predicted EGR rate in the cylinders may differ up to 75% from the experimental measurement at low engine averaged EGR rate. The model prediction improves to differences lower than 40% in EGR rate per cylinder if the engine operating points with an EGR rate lower than 10% are excluded. In this situation, 80% of the predicted in-cylinder EGR rates have differences lower than 25% when compared to experiments.

Sliding Mode Control of Automotive Engines

1993 ◽  
Vol 115 (4) ◽  
pp. 687-693 ◽  
Author(s):  
J. J. Moskwa
Keyword(s):  
Control Method ◽  
Sliding Mode ◽  
Torque Converter ◽  
Front Wheel ◽  
Control Laws ◽  
Loop Control ◽  
Automotive Engine ◽  
Shift Quality ◽  
Engine Model ◽  
Turbine Speed

There is considerable interest in coordinated automotive engine/transmission control for smooth shifts, or for traction control of front wheel drive vehicles. Closed-loop control of the engine has been shown to be useful in improving shift quality. Because of the nonlinear dynamic behavior of the engine, the control method of sliding modes is well suited for engine control algorithms. The authors outline a dynamic engine model, and develop the sliding control laws to follow desired torque converter pump and turbine speed trajectories. The relationships between these desired trajectories and shift quality are also outlined.

Physics-Based Lumped-Parameter Modeling of Automotive Canister Fuel Purge

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Matthew Franchek ◽  
Behrouz Ebrahimi ◽  
Karolos Grigoriadis ◽  
Imad Makki
Keyword(s):  
Flow Rate ◽  
Flow Resistance ◽  
Intake Manifold ◽  
Fuel Flow Rate ◽  
First Order ◽  
Single Output ◽  
Fuel Flow ◽  
Lumped Parameter ◽  
Tank Pressure ◽  
Direct Implementation

A physics-based model is presented to estimate the flow rate out of the fuel canister purged into the intake manifold. The lumped parameters of the model, including canister capacitance and flow resistance, are employed to obtain a first-order multi-input and single-output dynamic model. The vacuum pressure in the intake manifold and the fuel tank pressure serve as inputs, and the purged fuel flow rate is considered as the model output. The model does not require cumbersome computation, thereby allowing direct implementation in the fueling control to compensate for the extra fuel in regulation of the stoichiometric air–fuel ratio.

Estimation of Dynamic Fuel Parameters in Automotive Engines

1994 ◽  
Vol 116 (4) ◽  
pp. 774-780 ◽  
Author(s):  
J. J. Moskwa
Keyword(s):  
Experimental Results ◽  
Control Algorithms ◽  
Intake Valve ◽  
Controlled System ◽  
Delivery Model ◽  
Automotive Engine ◽  
Automotive Engines ◽  
Fuel Delivery

Many automotive engine models exist for the development of control algorithms. These models should include the important lags and delays which can affect the response of the overall controlled system. One of the most important, and most difficult parts of the engine to estimate is the fuel delivery model, from when the demand for fuel is calculated to intake valve closing. This paper describes procedures for estimating the parameters of a fuel delivery model, and provides experimental results using these techniques.

Development of an Automated Design System for Oil Pumps with Multiple Profiles (Circle, Ellipse and Involute)

2009 ◽  
Vol 620-622 ◽  
pp. 37-40 ◽  
Author(s):  
Chul Kim ◽  
Beom Cheol Hwang ◽  
Hyun Ki Moon ◽  
Hyun Woo Lee ◽  
Myung Jun Song
Keyword(s):  
Flow Rate ◽  
Essential Element ◽  
Integrated System ◽  
Design System ◽  
Automotive Engine ◽  
Automotive Engines ◽  
Lubricant Oil ◽  
Rotor Profile ◽  
Main Components ◽  
Lobe Pump

An internal lobe pump is suitable for oil hydraulics of machine tools, automotive engines, compressors, constructions and other other applications. In particular, this type of pump is an essential element of an automotive engine to feed lubricant oil. We perform a theoretical analysis of the internal lobe pump whose main components are rotors. Usually, the outer is characterized by a lobe with elliptical and involute shapes, while the inner rotor profile is determined as the conjugate to the other rotor. Our integrated system, which is composed of three main modules, was developed through AutoLISP using AutoCAD. It generates a new lobe profile, and automatically calculates the flow rate and flow rate irregularity according to the lobe profile generated. Results obtained from the analysis enable the designer and manufacturer of oil pumps to be more efficient.

PIV IN A RUNNING AUTOMOTIVE ENGINE: SIMULTANEOUS VELOCIMETRY FOR INTAKE MANIFOLD RUNNERS

2013 ◽  
Author(s):  
Dimitri Bonnet ◽  
Magali Barthès ◽  
Yannick Bailly ◽  
Laurent GIrardot ◽  
David Guyon ◽  
...  
Keyword(s):  
Intake Manifold ◽  
Automotive Engine

Dynamic Simulation of a HRSG System for a Given Start-Up/Shut Down Curve

2011 ◽  
Author(s):  
Hun Cha ◽  
Yoo Seok Song ◽  
Kyu Jong Kim ◽  
Jung Rae Kim ◽  
Sung Min KIM
Keyword(s):  
Dynamic Analysis ◽  
Gas Turbine ◽  
Flow Rate ◽  
Exhaust Gas ◽  
Fuel Flow Rate ◽  
Fuel Flow ◽  
Start Up ◽  
Gas Turbine Exhaust ◽  
Main Steam ◽  
Duct Burner

An inappropriate design of HRSG (Heat Recovery Steam Generator) may lead to mechanical problems including the fatigue failure caused by rapid load change such as operating trip, start-up or shut down. The performance of HRSG with dynamic analysis should be investigated in case of start-up or shutdown. In this study, dynamic analysis for the HRSG system was carried out by commercial software. The HRSG system was modeled with HP, IP, LP evaporator, duct burner, superheater, reheater and economizer. The main variables for the analysis were the temperature and mass flow rate from gas turbine and fuel flow rate of duct burner for given start-up (cold/warm/hot) and shutdown curve. The results showed that the exhaust gas condition of gas turbine and fuel flow rate of duct burner were main factors controlling the performance of HRSG such as flow rate and temperature of main steam from final superheater and pressure of HP drum. The time delay at the change of steam temperature between gas turbine exhaust gas and HP steam was within 2 minutes at any analysis cases.

Model Analysis of Syngas Combustion and Emissions for a Micro Gas Turbine

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Chi-Rong Liu ◽  
Hsin-Yi Shih
Keyword(s):  
Gas Turbine ◽  
Flow Rate ◽  
Heat Input ◽  
Emission Characteristics ◽  
Nox Emissions ◽  
Fuel Flow Rate ◽  
Micro Gas Turbine ◽  
Fuel Flow ◽  
Temperature Distributions ◽  
Flame Structures

The purpose of this study is to investigate the combustion and emission characteristics of syngas fuels applied in a micro gas turbine, which is originally designed for a natural gas fired engine. The computation results were conducted by a numerical model, which consists of the three-dimension compressible k–ε model for turbulent flow and PPDF (presumed probability density function) model for combustion process. As the syngas is substituted for methane, the fuel flow rate and the total heat input to the combustor from the methane/syngas blended fuels are varied with syngas compositions and syngas substitution percentages. The computed results presented the syngas substitution effects on the combustion and emission characteristics at different syngas percentages (up to 90%) for three typical syngas compositions and the conditions where syngas applied at fixed fuel flow rate and at fixed heat input were examined. Results showed the flame structures varied with different syngas substitution percentages. The high temperature regions were dense and concentrated on the core of the primary zone for H2-rich syngas, and then shifted to the sides of the combustor when syngas percentages were high. The NOx emissions decreased with increasing syngas percentages, but NOx emissions are higher at higher hydrogen content at the same syngas percentage. The CO2 emissions decreased for 10% syngas substitution, but then increased as syngas percentage increased. Only using H2-rich syngas could produce less carbon dioxide. The detailed flame structures, temperature distributions, and gas emissions of the combustor were presented and compared. The exit temperature distributions and pattern factor (PF) were also discussed. Before syngas fuels are utilized as an alternative fuel for the micro gas turbine, further experimental testing is needed as the modeling results provide a guidance for the improved designs of the combustor.

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