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Gasoline direct injection

Mixture formation system / From Wikipedia, the free encyclopedia

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Gasoline direct injection (GDI), also known as petrol direct injection (PDI),[1] is a mixture formation system for internal combustion engines that run on gasoline (petrol), where fuel is injected into the combustion chamber. This is distinct from manifold injection systems, which inject fuel into the intake manifold (inlet manifold).

GDI engine from a BMW car (fuel injector is located above the red triangle)

The use of GDI can help increase engine efficiency and specific power output as well as reduce exhaust emissions.[2]

The first GDI engine to reach production was introduced in 1925 for a low-compression truck engine. Several German cars used a Bosch mechanical GDI system in the 1950s, however usage of the technology remained rare until an electronic GDI system was introduced in 1996 by Mitsubishi for mass-produced cars. GDI has seen rapid adoption by the automotive industry in recent years, increasing in the United States from 2.3% of production for model year 2008 vehicles to approximately 50% for model year 2016.[3][4]