Optimization-Oriented High Fidelity NFIR Models for Estimating Indicated Torque in Diesel Engines

In this paper, optimization-oriented high fidelity indicated torque models which cover the whole operating regions under both steady-state and transient cycles for heavy-duty vehicles are developed. Two different experiments are performed and their data are merged to be utilized in the training of t...

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Bibliographic Details
Published in:International journal of automotive technology 2020, 21(3), 115, pp.729-737
Main Authors: Alcan, Gokhan, Aran, Volkan, Unel, Mustafa, Yilmaz, Metin, Gurel, Cetin, Koprubasi, Kerem
Format: Article
Language:English
Subjects:
Automotive Engineering
Chirp signals
Diesel engines
Engineering
Experiments
Impulse response
Model accuracy
Neural networks
Optimization
Regression analysis
Sensitivity analysis
Torque
자동차공학
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Summary:In this paper, optimization-oriented high fidelity indicated torque models which cover the whole operating regions under both steady-state and transient cycles for heavy-duty vehicles are developed. Two different experiments are performed and their data are merged to be utilized in the training of the models. In the first experiment, all combustion input channels are excited by quadratic chirp signals with different sweeps in their frequency profiles. Different from the first experiment, the engine speed is excited by ramp-hold signals in the second experiment. The estimations of friction, pumping and inertia torques in addition to the torque measured from the engine dynamometer are utilized in the indicated torque calculations. In order to model the calculated indicated torque, a nonlinear finite impulse response (NFIR) model with a single layer sigmoid neural network has been designed. A sensitivity analysis is performed by generating several models with different number of input regressors and neurons. Experimental results show that the majority of the models in a selected wide range of the model parameters are validated with fit accuracies higher than 90 % and 85 % on the World Harmonized Stationary Cycle (WHSC) and the World Harmonic Transient Cycle (WHTC), respectively.
ISSN:1229-9138
1976-3832
DOI:10.1007/s12239-020-0071-2