A systematic approach towards automated control design for heavy-duty EGR diesel engines

This paper presents a model-based design method for a robust air path controller of adiesel engine with Exhaust Gas Recirculation (EGR). Following the ?? synthesis framework,a MIMO controller is developed, which guarantees robustness and optimal performance.This controller simultaneously controls EGR ow and air-fuel ratio. Due to the systematicdesign approach, this controller can be automatically generated, which dramatically reducescalibration time. Performance improvements are shown using simulations

Comparison of EGR-VTG control schemes for an EPA2010 heavy-duty diesel engine

Next generation heavy-duty diesel engines require tight air path control to meet upcoming emission legislation with minimal fuel consumption. This study concentrates on the emission control of a 13l, 360 kW EGR diesel engine, which is compliant with EPA2010 emission targets. Currently, an input-decoupled controller design is often applied for EGR-VTG control. The performance of such a state-ofthe- art controller is compared with an SVD-decoupled control design and time optimal control. All three controllers use a newly introduced control parameter: exhaust oxygen concentration. For disturbances around an engine operating point, the performance of these controllers is evaluated from simulation results. Especially, settling time and NOx and PM emissions are of interest. A comparison is presented which shows that SVD-decoupled control will give improvements over input decoupled control in terms of performance and simplicity. Time optimal control shows that further improvements of settling times are possible, but the required large control inputs will have a significant effect on the produced torque

Under actuated air path control of Diesel engines for low emissions and high efficiency

This paper presents a new method for feedback control using the Exhaust Gas Recirculation (EGR) valve and Variable Geometry Turbine (VGT) of a diesel engine. The controller effectively counteracts disturbances in NOx and PM emissions while maintaining the fuel efficiency. It is shown that by using a new combination of outputs, the controlled system has very good robustness properties. Using a mean-value engine model, which is extended with an emission model, the performance of the controlled system is examined in a simulation study with various applied disturbances; the feedback controller is shown to reduce the variation of emissions and pumping losses by 80–90 %. Compared to open loop control, the feedback controlled system has lower overall emissions by 14 % in NOx, 19 % in PM and a simultaneous 0.7 % improvement of the brake specific fuel consumption is achieved

A control oriented multivariable identification procedure for turbocharged diesel engines

In this paper, multisine frequency response function identification is used for non-parametric modeling of the air path of a turbocharged diesel engine around a fixed operating point. The Variable Geometry Turbine (VGT) and Exhaust Gas Recirculation (EGR) valve are used as inputs. The nitrogen oxide emissions, air-fuel equivalence ratio, and pressure difference between the intake and exhaust manifold are the considered outputs. A time-efficient and accurate identification procedure for this input-output system is devised, analyzed, and executed experimentally for a range of operating points. The analysis quantifies the individual effects of noise and nonlinearities and shows that the identified linear models capture the actual local behavior with over 97.2% accuracy

LPV control of an active vibration isolation system

Non-stationary disturbances in motion systems generally limit the closed-loop performance. If these disturbance can be measured, this measurement can be used to enable a linear parameter varying (LPV) controller to adapt itself to the current operating condition, resulting in a closed-loop system with an overall increased performance. In this paper, this idea is applied to an active vibration isolation system