Abstract:
An efective torque model has been developed, with application in the domain of fex-fuel engines that operate using gasolineethanol fuel mixtures. The study initiates by establishing a mono-fuel model and subsequently investigates the impact of fuel composition on combustion efciency, friction losses, gaseous pumping, and optimal ignition timing. The resulting bifuel efective torque model operates in real time, thereby enabling control design through the utilization of a programmable engine control unit (ECU). To validate the model, simulated and measured efective torque curves have been employed to showcase the model’s ability to accurately replicate the behavior exhibited by real systems. The model achieves a mean error of 6.3% and a standard deviation of 6.04% for thermal efciency estimation, demonstrating its efectiveness despite the inherent uncertainties associated with combustion in automotive engines and the required simplifcations for real-time application. The methodology employed in this study involves gathering data from a bench dynamometer equipped with a fex-fuel engine. These data are utilized to develop a mean value efective torque model, intended for integration within the ECU as an estimator, enabling the project of torque controllers. Finally, an adaptive multivariable PI controller is presented, which acts on throttle opening, injection duration, and ignition angle to regulate efective torque. The stability is proven and, as a result, the controlled signal exhibited good reference tracking and an appropriate settling time.
Referência:
SILVA, Marcos Henrique Carvalho da; MAGGIO, André Vinícius Oliveira; PEREIRA, Bruno Silva; MOSCARDINI, Demerson; LAGANÁ, Armando Antônio Maria; JUSTO FILHO, João Francisco; TEIXEIRA, Evandro Leonardo Silva. Effective torque modeling of gasolne-ethanol engine for multivariable adaptive control design. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v.46, n.692, p.1-18, Nov., 2024.
Acesso ao artigo no site do Periódico:
https://link.springer.com/article/10.1007/s40430-024-05271-5
