Abstract

Este artículo describe una nueva técnica para controlar la fracción de aire fresco en el colector de admisión de motores Diesel con doble circuito de recirculación de gases de escape (RGE). Esta estrategia de control permite regular eficientemente la fracción de aire, satisfaciendo al mismo tiempo una proporción deseada entre las RGEs de alta y baja presión. Basado en un modelo físico de la dinámica de la fracción de aire a lo largo del sistema de aire del motor, un regulador lineal cuadrático a parámetros variables (LPV-LQR) es diseñado para asegurar la estabilidad de la fracción de aire y minimizar un índice de desempeño cuadrático. La controlabilidad del sistema, necesaria para garantizar la existencia del controlador LPV-LQR, se verifica mediante la definición de un subespacio convexo de parámetros utilizando un enfoque politópico. El controlador es evaluado bajo fuertes condiciones transitorias utilizando como referencia, un modelo del motor validado experimentalmente.

Highlights

  • Regulations of Diesel engine emissions have become stricter, and satisfying simultaneously the emissions legislations and the desired engine drivability objectives is a challenging issue

  • This paper describes a novel technique to control the air fraction in the intake of dual-loop exhaust gas recirculation (EGR) Diesel engines

  • Based on a modified physical model of the air fraction dynamics along the engine air-path, a linear parameter varying (LPV) linear quadratic regulator (LQR) control is designed to ensure the stability of the air fraction while minimizing a quadratic performance index

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Summary

Introduction

Regulations of Diesel engine emissions have become stricter, and satisfying simultaneously the emissions legislations and the desired engine drivability objectives is a challenging issue. The introduction of sophisticated alternative combustion modes such as homogeneous charge compression ignition (HCCI), low temperature combustion (LTC) and premixed controlled compression ignition (PCCI) offers a great potential to reduce the engine emissions levels [1]-[3] These new modes require specific fueling strategies and in-cylinder conditions, creating the need for more complex, reliable and precise control systems and technologies. We address the problem of controlling the air fraction as well as the EGR proportion in dual-loop EGR architectures by means of an industryoriented state feedback control. A prioritization of HP-EGR can be performed when short air fraction settling time is required while the LP-EGR can be prioritized when supercharging performance is needed

DPF DPfap
Air Fraction Observer
Intake Manifold Air Fraction
Findings
Conclusions
Full Text
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