Abstract
This brief addresses the emission reduction of spark ignition engines by proposing a new control to regulate the air-fuel ratio (AFR) around the ideal value. After revisiting the engine dynamics, the AFR regulation is represented as a tracking control of the injected fuel amount. This allows to take the fuel film dynamics into consideration and simplify the control design. The lumped unknown engine dynamics in the new formulation are online estimated by suggesting a new effective unknown system dynamics estimator. The estimated variable can be superimposed on a commercially configured, well-calibrated gain scheduling like proportional-integral-differential (PID) control to achieve a better AFR response. The salient feature of this proposed control scheme lies in its simplicity and the small number of required measurements, that is, only the air mass flow rate, the pressure and temperature in the intake manifold, and the measured AFR value are used. Practical experiments on a Tata Motors Limited two-cylinder gasoline engine are carried out under a realistic driving cycle. The comparative results show that the proposed control can achieve an improved AFR control response and reduced emissions.
| Original language | English |
|---|---|
| Pages (from-to) | 786-793 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Control Systems Technology |
| Volume | 29 |
| Issue number | 2 |
| Early online date | 9 Dec 2019 |
| DOIs | |
| Publication status | Published - 31 Mar 2021 |
Funding
Manuscript received April 9, 2019; revised October 16, 2019; accepted October 23, 2019. Date of publication December 9, 2019; date of current version February 9, 2021. Manuscript received in final form October 29, 2019. This work was supported in part by the Marie Curie Intra-European Fellowships Project AECE under Grant FP7-PEOPLE-2013-IEF-625531 and in part by the National Nature Science Foundation of China under Grant 61922037 and Grant 61873115. Recommended by Associate Editor M. Tanelli. (Corresponding author: Jing Na.) J. Na and Y. Huang are with the Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China (e-mail: [email protected]; [email protected]).