Several vehicle manufacturers such as Audi, Mitsubishi, Mercedes,
BMW, Toyota/Lexus, Mazda, Ford, and General Motors are using
gasoline direct injection (GDI) systems, which General Motors refers to as a Spark Ignition Direct Injection (SIDI) system. A directinjection system sprays high-pressure fuel, up to 2,900 PSI, into the
combustion chamber as the piston approaches the top of the compression stroke. With the combination of high-pressure swirl injectors
and modified combustion chamber, almost instantaneous vaporization of the fuel occurs. This combined with a higher compression ratio
allows a direct-injected engine to operate using a leaner-than-normal
air fuel ratio, which results in improved fuel economy with higher
power output and reduced exhaust emissions. b SEE FIGURE 79 1
đang được dịch, vui lòng đợi..