Natural Gas injection for low CO2 spark ignition engines English Free

Compressed natural gas is increasingly being considered as a vehicle fuel due to its low CO2 impact and its growing global availability at an attractive price. The current state of the art for light duty compressed natural gas (CNG) engines in series production is port fuel injection (PFI). In downsized, boosted engines this results in a loss of low-end torque when compared to a gasoline direct-injected (DI) engine due to lower volumetric efficiency and the inability to perform scavenging.
One method for recovering this torque loss is direct injection of the gaseous CNG fuel. Significant progress has been made in the development of direct injection of compressed natural gas for passenger car engines. The key enabling component is the DI-CNG injector, for which the concept and the development status will be presented. The next Delphi project phase will focus on process development and the conception and installation of a prototype assembly line in order to prepare the future industrialization of the CNG injector hardware. These activities are supported under the umbrella of a European LIFE+ project.
Additionally, engine and vehicle benefits will be summarized showing the ability to meet and even exceed current downsized DI-gasoline performance