Idle Speed Control of GDI-SI Engines via ECU-1D Engine Co-Simulation Istituto Motori CNR

Format:

Conference/Event

Author/Creator:

di Gaeta, di Gaeta, author.

Contributor:

Giglio, Veniero

Montanaro, Umberto

Conference Name:

SAE 2010 Powertrains Fuels & Lubricants Meeting (2010-10-25 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Idle Speed Control plays a crucial role to reduce fuelconsumption that turns in both a direct economic benefit forcustomers and CO\d reduction particularly important to tackle theprogressive global environmental warming. Typically, controlstrategies available in the automotive literature solve the idlespeed control problem acting both on the throttle position and thespark advance, while the Air-Fuel Ratio (AFR), that stronglyaffects the indicated engine torque, is kept at the stoichiometricvalue for the sake of emission reduction. Gasoline Direct Injection(GDI) engines, working lean and equipped with proper mechanisms toreduce NOx emissions, overcome this limitation allowing the AFR tobe used for the idle speed regulation.In this paper, an effective model of the GDI engine dynamics isderived, tuned and then used to synthesize a gain schedulingcontrol strategy which comprises a feedback action acting on thethrottle position, and a feedforward compensator which variesdynamically the demand of the AFR control task. The former controlaction is mainly exploited to accomplish smooth transitions from/toidle speed regime, whereas the latter copes with torquedisturbances at idle speed mainly due to the intermittent use ofaccessory loads. In so doing, a faster actuation path, providedthrough the AFR control, is added to the air control path toincrease performance both in terms of disturbance rejection andfuel economy. Comparison between performance provided by ourcontrol approach and a classical LQ strategy, which controls boththe throttle angle and the spark advance when the AFR is kept atthe stoichiometric value, confirms the effectiveness of theproposed control architecture with respect to different costindexes.Model validation as well as the effectiveness of the controldesign are carried out by means of ECU-1D Engine Co-Simulationtools. The combination in a one integrated designing environment ofcontrol systems and virtual engine, simulated through highpredictive commercial 1D-code, becomes a high predictive tool forautomotive control engineers and fast prototyping

Notes:

Vendor supplied data

Publisher Number:

2010-01-2220

Access Restriction:

Restricted for use by site license