A Control-Oriented Model for Dynamics From Fuel Injection Profile to Intake Gas Conditions in Diesel Engines

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Fengjun Yan ◽  
Junmin Wang
Keyword(s):  
Diesel Engines ◽  
Fuel Injection ◽  
Critical Role ◽  
High Fidelity ◽  
Combustion Mode ◽  
Engine Model ◽  
Advanced Combustion ◽  
Path Control ◽  
Simulation Results ◽  
Transient Operations

Fuel injection profile variations play a critical role in advanced combustion mode control for diesel engines and also possess control authorities on engine in-cylinder conditions (ICCs). In order to systematically utilize the active fueling control, in conjunction with air-path control, for transient operations of advanced multimode combustion diesel engines, this paper presents a physics-based, control-oriented model that describes the inherent dynamics from fuel injection profile variations to the intake gas conditions. To show the effectiveness of the developed control-oriented model, comparisons were made with the simulation results from a high-fidelity GT-Power computational engine model as well as the experimental data acquired on a medium-duty diesel engine during transient operations.

Diesel Engine Intake Condition Control-Oriented Models for Active Fuel Injection Profile Control

2011 ◽  
Author(s):  
Fengjun Yan ◽  
Junmin Wang
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Combustion Process ◽  
Exhaust Gas Recirculation ◽  
High Fidelity ◽  
Exhaust Gas ◽  
Engine Model ◽  
Profile Control ◽  
Gas Recirculation

Fueling control in Diesel engines is not only of significance to the combustion process in one particular cycle, but also influences the subsequent dynamics of air-path loop and combustion events, particularly when exhaust gas recirculation (EGR) is employed. To better reveal such inherently interactive relations, this paper presents a physics-based, control-oriented model describing the dynamics of the intake conditions with fuel injection profile being its input for Diesel engines equipped with EGR and turbocharging systems. The effectiveness of this model is validated by comparing the predictive results with those produced by a high-fidelity 1-D computational GT-Power engine model.

A Dual-Loop EGR Engine Air-Path Oxygen Concentration Model With Time-Varying Transport Delays

2013 ◽  
Author(s):  
Xiangrui Zeng ◽  
Junmin Wang
Keyword(s):  
Oxygen Concentration ◽  
Dynamic Models ◽  
Operating Conditions ◽  
High Fidelity ◽  
Exhaust Gas ◽  
Time Varying ◽  
Transport Delay ◽  
Engine Model ◽  
Gas Recirculation ◽  
Transient Operations

Dual-loop exhaust gas recirculation (EGR) systems can provide control authorities for adjusting the engine in-cylinder gas conditions. However, the transport delay in the EGR air-path makes some simple oxygen concentration dynamic models perform poorly under the transient operating conditions. In this paper, a dual-loop EGR air-path oxygen concentration model considering the time-varying transport delays is developed and a method to calculate the delay time based on the continuity of gas velocity is presented. Simulation validations using a high-fidelity GT-Power 1-D computational engine model show that the developed model can capture the oxygen concentration dynamics during both steady-state and transient operations.

Cycle-by-Cycle Based In-Cylinder Temperature Estimation for Diesel Engines

2013 ◽  
Author(s):  
Song Chen ◽  
Fengjun Yan
Keyword(s):  
Model Simulation ◽  
Low Cost ◽  
Estimation Method ◽  
High Fidelity ◽  
Temperature Estimation ◽  
Engine Model ◽  
Advanced Combustion ◽  
Combustion Modes ◽  
Auto Ignition ◽  
Crank Angle

The in-cylinder temperature information is critical in the field of auto-ignition control in advanced combustion modes. However, the in-cylinder temperature is hard to be directly measured at low cost in production engines. In this paper, a cycle-by-cycle estimation method is proposed for the in-cylinder temperature at the crank angle of intake valve closing (IVC), referred to as Tivc. Through investigating the thermodynamics of Tivc, an Extended Kalman Filter (EKF) based method was devised by utilizing the measurable temperature information from the intake and exhaust manifolds. The proposed method was validated through high-fidelity GT-Power engine model simulation.

Control-Oriented Dynamic Models for In-Cylinder Conditions of Multi-Cylinder Diesel Engines

2010 ◽  
Author(s):  
Fengjun Yan ◽  
Junmin Wang
Keyword(s):  
Diesel Engines ◽  
Dynamic Models ◽  
Gas Temperature ◽  
Engine Model ◽  
Oxygen Fraction ◽  
Advanced Combustion ◽  
Engine Combustion ◽  
Gas Recirculation ◽  
Very High ◽  
Physical Principles

This paper presents control-oriented models, describing the dynamics of the in-cylinder conditions (ICCs) at intake valve closing (IVC), for multi-cylinder Diesel engines. Such models are based on multi-cylinder Diesel engines equipped with dual-loop exhaust gas recirculation (EGR) systems. As the thermodynamic boundary conditions for Diesel engine combustion, ICCs at IVC play critical roles for controlling combustion, particularly advanced combustion modes whose sensitivities to ICCs are very high. Grounded in physical principles, control-oriented ICC dynamic models were developed to describe the multi-cylinder characteristic and the coupling effects among the ICC quantities (i.e. in-cylinder gas mass, gas temperature, and oxygen fraction at IVC). The effectiveness of the developed control-oriented model was validated by comparing with a high-fidelity, 1-D computational, GT-Power engine model.

Sign in / Sign up

Export Citation Format

Share Document