Model-Based Control of a Turbocharged Diesel Engine with High- and Low-Pressure Exhaust Gas
Zusammenfassung
“Model-Based Control of a Turbocharged Diesel Engine with High- and Low-Pressure Exhaust Gas Recirculation“ presents the complete scope for a model-based control design with regard to the control objective dynamical driving cycle emissions. A semi-physical air path model delivers system properties of the controlled system. Experimental models for stationary and dynamical engine raw emissions are the base for stationary and dynamical optimisations of emissions and engine torque and allow to motivate deviations between stationary and dynamical emission formation. The control concept directly incorporates semi-physical relationships and model parameters of the air path model for control of HP-EGR, LP-EGR and charging pressure. The control performance is rated with quantified stationary and dynamical contributions to the overall driving cycle emissions. All models and control methods have been experimentally parameterised and validated at an engine test bench.
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Schlagworte
- Kapitel Ausklappen | EinklappenSeiten
- I–XX
- 1–7 1 Introduction 1–7
- 1.1 Thesis Objective
- 1.2 Thesis Outline and new Contributions
- 8–11 2 Engine Configuration and Modelling 8–11
- 2.1 Engine Configuration with two EGR-Systems
- 12–33 3 Semi-Physical Mean Value Engine Model 12–33
- 3.1 Intake and Exhaust System
- 3.2 Mean Value Cylinder Model
- 3.3 Turbocharger
- 3.3.1 Mass Flow Rate
- 3.3.2 Turbocharger Power
- 3.3.3 Turbocharger Heat Transfer
- 3.4 Mean Value Engine Model Signal Flow Diagram
- 3.5 Summary
- 34–60 4 System Properties of the Air Path with HP- and LP-EGR 34–60
- 4.1 Air Path System Analysis by Step Responses
- 4.1.1 HP-EGR Actuator System Responses
- 4.1.2 VGT-Actuator System Responses
- 4.1.3 LP-EGR/ETH Actuator System Responses
- 4.1.4 Time Constants and Process Gains of the Air Path Model
- 4.1.5 Summarised Air Path Couplings in P-Canonical Structure
- 4.1.6 Summary
- 4.2 Stationary System Properties
- 4.2.1 Properties of the Combined LP-EGR Actuators
- 4.3 Air Content Dynamics
- 4.4 Air Content Model
- 4.5 Summary
- 61–85 5 Emission and Combustion Models 61–85
- 5.1 Intake and Exhaust System Dynamics
- 5.2 Measurement Design
- 5.3 Stationary Emission and Combustion Models
- 5.3.1 Suitable Model Inputs and Outputs
- 5.3.2 Global-Local Polynomial Model Approach
- 5.3.3 Extrapolation Measure
- 5.3.4 Model Results
- 5.3.5 Intersection Plots of the Emission Model
- 5.4 Models for the Dynamical Emissions
- 5.5 Summary
- 86–101 6 Optimisation of the Reference Values for the Air Path Control 86–101
- 6.1 Stationary Reference Value Optimisation
- 6.2 Dynamical Reference Value Optimisation
- 6.2.1 Dynamical Emissions of Different Air Path Control Concepts
- 6.2.2 Multi-Criteria Optimisation of Dynamical Reference Values
- 6.3 Summary
- 102–167 7 Air Path Control Design and Dynamical Reference Value Generation 102–167
- 7.1 Air Path Control Scheme
- 7.2 Control Structure for HP-EGR and Charge-AirPressure
- 7.3 Decentralised PI(D)-Controllers for HP-EGR and Charge-Air Pressure
- 7.4 Semi-Physical Feedforward Control for HP-EGR and Charge-AirPressure
- 7.4.1 Turbocharger Model Inversion
- 7.4.2 Model-Inversion Model Follow-Up Control
- 7.4.3 HP-EGR Model-Inversion
- 7.4.4 Model Follow-Up Control Simulation
- 7.4.5 Further Aspects on Charge-Air Pressure Control
- 7.4.6 Signal Flow Diagram
- 7.4.7 Conclusions on the Semi-Physical Feedforward Control
- 7.5 Semi-Physical Internal Model Control for HP-EGR and Charge-Air Pressure
- 7.6 Engine Test Bench Control Results for HP-EGR and Charge-AirPressure
- 7.7 Semi-Physical Control for the LP-EGR Path
- 7.8 Dynamical Reference Value Generation for HP- and LP-EGR
- 7.8.1 Reference Value Generation Scheme
- 7.8.2 Invariance to Modelling and Measurement Uncertainties
- 7.8.3 Engine Test Bench Measurements
- 7.9 Dynamical Driving Cycle Emissions of Different Control Concepts
- 7.9.1 Dynamical Emissions of the HP-EGR Series Calibration
- 7.9.2 Dynamical Emissions of the Dual EGR-Path Calibration
- 7.9.3 Essential Findings of Sect. 7.9
- 7.10 Summary
- 168–171 8 Conclusions 168–171
- 172–189 Appendix 172–189
- A Test Facilities
- B Exhaust Temperature Model
- C EGR-Valve Characteristic Shaping
- D Gas Mass Storage in Intake Volumes
- E Emission and Combustion Models
- 190–204 Bibliography 190–204
