Enhanced Mixture Preparation Approach for Lean Stratified SI-Combustion by a Combined Use of GDI and Electronically Controlled Valve-Timing Magneti Marelli

Format:

Conference/Event

Author/Creator:

Pontoppidan, M., author.

Conference Name:

SAE 2000 World Congress (2000-03-06 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2000

Summary:

The first part of the paper gives an overview of the current status in fuel consumption gain of the GDI-vehicles previously launched on the European market.In order to increase the potential for a further gain in specific fuel consumption the behaviour of 3 different combustion chamber layouts are studied.The chamber layouts are aimed to adapt as well as possible to the particular requirements for application to a small displacement/small bore engine working in stratified lean conditions.The paper continues with a description of the application that shows the different steps of a structured optimisation methodology for a 1.2 litre, small bore 4-cylinder engine.The applications of an air-motion-guided and a wall-guided layout with a mechanically actuated valve train to the same combustion chamber are discussed. The potential of the air-motion-guided concept is enhanced through the introduction of an electromagnetic fully variable valve train.The layouts are analysed through numerical simulation and tested either on a single cylinder or on a 4 cylinder engine test rig.The paper concludes with a discussion of the impact of the improvement, which can be obtained through a combination of GDI with fully variable control systems for air-motion and low energy consuming auxiliary components

Notes:

Vendor supplied data

Publisher Number:

2000-01-0532

Access Restriction:

Restricted for use by site license