Modelling of a Diesel Engine Common Rail Injection System

Abstract

This paper is devoted to the modelling of a Diesel Common Rail Injection System. The objective is twofold : to build a simulator which will be used later for the rail pressure control scheme validation, and to get linearized models for control design. A mathematical model, based on physical equations is developed and used as a simulator. Then time responses of the rail pressure of a real engine and of the simulator are compared in order to check the accuracy of the model. A frequency domain approach is finally proposed to validate linearized control-oriented models.

Modelling and predictive control of a new injection system for compressed natural gas engines

“…Namely, only the more significant characteristics can be taken into account leaving most secondary effects un-described mathematically. In this way, without losing essential validity, the injection system can be represented by ordinary differential equations (ODE) (Aespy, Engja, & Skarboe, 1996;Desantes, Arregle, & Rodriguez, 1999;Fuseya, Nishimura, Sato, & Tanaka, 1999;Gauthier, Sename, Dugard, & Meissonnier, 2005;Morselli, Corti, & Rizzoni, 2002), by transfer function (Kuraoka, Ohka, & Ohba, 1989), or state-space description (Lino, Maione, & Rizzo, 2007;Maione et al, 2004). Since the simplicity is a focal point, this paper is specifically aimed at defining a simple enough control-oriented model, which at the same time ensures reliable data used to design a predictive control law.…”

An LFT Approach toH$_{\infty}$ Control Design for Diesel Engine Common Rail Injection System

“…The remaining subsystems, such as the IMV actuator or the HP pump, are modelled using physical equations (electrical, hydraulic and mechanical) and then linearized in a generic way to lead to LPV models. Note that the complete non linear model in Gauthier et al (2005) is a 9th-order system.…”

“…The hydraulic equations based model proposed in Gauthier et al (2005) uses two physical characteristics of the rail: the volume V [m 3 ], and the bulk modulus K [Pa]. Let us recall that the bulk modulus is a fuel feature describing the behavior of the rail pressure variation against flows, i.e.…”

“…A complete non linear model of the system was proposed in (Gauthier et al, 2005) as the interconnection of the models of the five subsystems. This model was validated on real data and may be used for control validation.…”

“…The discrete-time H ∞ LFT anti-windup controller is validated on a fine non linear Diesel Engine Common Rail Injection model, see (Gauthier et al, 2005) for more details. The model is driven by experimental input data obtained from a real vehicle.…”