A new injector concept for multimode operation in gasoline direct injection engines. (August 2014)

• Record Type: Journal Article
• Authors: Mandumpala Devassy, B; Bakshi, S; Ramesh, A
• Is Part Of: International journal of engine research. Volume 15:Number 5(2014)
• Page Start: 626
• Page End: 638
• Publication Date: 2014-08
• Subjects: Gasoline direct injection engine -- fuel spray -- injector -- spark plug -- gasoline direct injection injector; Engines -- Periodicals; 629.25
• DOI: 10.1177/1468087413501315
• Languages: English
• ISSNs: 1468-0874

Abstract

A gasoline direct injection engine typically operates in multiple fuel preparation modes. In general, at higher loads, a homogeneous mixture is favored, whereas a stratified mixture is preferred at part- and low-load conditions. This is usually achieved by altering the injection parameters and injection strategy with respect to load and speed and through appropriate cylinder and piston geometries. In this article, a new injector concept has been proposed to aid attaining multiple modes in a gasoline direct injection engine. This is achieved by shaping the spray structure to suit the required mixture preparation. Detailed simulations are performed to assess the mixing process in a gasoline direct injection engine using the new injector. The charge preparation at the onset of ignition is studied for different injection modes of the same injector. The results indicate a significant improvement in the mixing process for different modes of operation.