Abstract
Gaussian Process Regression (GPR) provides emerging modeling opportunities for diesel engine control. Recent serial production hardwares increase online calculation capabilities of the engine control units. This paper presents a GPR modeling for feedforward part of the diesel engine airpath controller. A variable geotmetry turbine (VGT) and an exhaust gas recirculation (EGR) valve outer loop controllers are developed. The GPR feedforward models are trained with a series of mapping data with physically related inputs instead of speed and torque utilized in conventional control schemes. A physical model-free and calibratable controller structure is proposed for hardware flexibility. Furthermore, a discrete time sliding mode controller (SMC) is utilized as a feedback controller. Feedforward modeling and the subsequent airpath controller (SMC+GPR) are implemented on the physical diesel engine model and the performance of the proposed controller is compared with a conventional PID controller with table based feedforward.
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Abbreviations
- P i :
-
nomenclature
- P x :
-
intake manifold pressure
- P c :
-
exhaust manifold pressure
- P a :
-
compressor power
- R :
-
ambient pressure
- R :
-
ideal gas constant
- T i :
-
intake manifold temperature
- T x :
-
exhaust manifold temperature
- T a :
-
ambient temperature
- V i :
-
intake manifold volume
- τ :
-
turbocharger time constant
- W ci :
-
compressor mass airflow
- W xi :
-
exhaust gas recirculation mass flow
- W ie :
-
engine inlet gas mass flow
- W xt :
-
turbine inlet gas mass flow
- W f :
-
fuel mass flow
- η c :
-
isentropic compressor efficiency
- η T :
-
turbine total efficiency
- c :
-
specific heat of air
- u ff :
-
feedforward control term
- u fb :
-
feedback control component
- Ar EGR :
-
exhaust gas recirculation valve area
- h xt :
-
exhaust gas enthalpy
- u 1 :
-
controlled input 1, area of EGR
- u 2 :
-
controlled input 2, area of VGT
- μ :
-
isentropic ratio
- r VGT :
-
VGT vane position
- r EGR :
-
EGR valve position
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Aran, V., Unel, M. Gaussian Process Regression Feedforward Controller for Diesel Engine Airpath. Int.J Automot. Technol. 19, 635–642 (2018). https://doi.org/10.1007/s12239-018-0060-x
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DOI: https://doi.org/10.1007/s12239-018-0060-x