| Titre : | A model based estimator for cylinder specific air-to-fuel ratio corrections (2011) |
| Auteurs : | Meyer, Jason A., Auteur ; Yurkovich, Stephen, Auteur ; Midlam-Mohler, Shawn, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of dynamic systems, measurement, and control (Vol. 133 N° 3, Mai 2011) |
| Article en page(s) : | 14 p. |
| Note générale : | Systèmes dynamiques |
| Langues : | Anglais |
| Index. décimale : | 629.8 |
| Tags : | Closed loop systems Engines Exhaust Feedback Feedforward FIR filters Fuel Mechanical variables control Open |
| Résumé : | One of the most overlooked and oversimplified components of an engine model used for model based air-to-fuel ratio (AFR) control and/or diagnostics is the exhaust gas dynamics model. Without a proper model of the exhaust system, the mixing of exhaust gases and the dynamic transport delays are challenging to capture accurately, even with a meticulous experimental calibration. By representing the exhaust system with a finite impulse response (FIR) model whose coefficients are based on physical properties, these effects can be predicted accurately and smoothly across the complete range of operating conditions. Through on-line and off-line techniques, this model can markedly improve the performance of both open loop and closed loop AFR control. Because a FIR model has a linear relationship between the input and the output, the input error trajectory can be identified from a single precatalyst oxygen sensor measurement. This technique can be used to supplement the calibration of either the feed-forward or feedback portion of the AFR controller. Additionally, the FIR model can be used for on-line estimation of cylinder imbalance errors. This model based approach to cylinder imbalance estimation has several advantages over the current empirically based methods including robustness and ease of calibration. |
| DEWEY : | 629.8 |
| ISSN : | 0022.0434 |
| En ligne : | http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000133000003031001000001&idtype=cvips&gifs=Yes&ref=no |
