GM to Install Direct Injected Engines in 2012 Buick Model
The direct injection fuel delivery system has enabled fuel economy improvements up to three percent on Buick Enclave, LaCrosse, Regal and the upcoming Verano without reducing its performance and still meeting the emission standards.
The fuel delivery system was derived from the carburetor which was based on the Bernoulli effect. The fuel draws up through the tiny jet accelerated by air to the precise throttle body injection that gave way to port and finally direct injection.
In the direct injection technology, the high pressure direct injectors deliver fuel to the point of combustion in the cylinder, and the fuel will not be left on manifold walls or evaporate up out of a carburetor.
The demise of the carburetor ended problems like flooding and vapor lock and direct injection brings several benefits over the more recent sequential port fuel injection systems. The direct injection system also provides a charge cooling effect when used on boosted engines like the 2-liter Ecotec Turbo in the Regal and the upcoming Regal GS.
The second injection pulse is also added, before the spark plug ignites the fuel following a cold start, it helps to warm up faster that reduce the emissions of unburned hydrocarbons by up to 25 percent.
Mike Anderson, chief engineer of Ecotec, said: â€œThe 2,200 pounds per square inch of pressure that feeds the injectors provides a more atomized and precisely metered fuel spray to each cylinder before every combustion event.
â€œSpraying fuel directly into the combustion chamber reduces the temperature of the compressed mixture as the fuel evaporates, which enables a higher-compression ratio, allows for more spark advance, and reduces fuel consumption. The beefier low-end torque and improved drivability of the direct-injected 2L turbo makes it a no compromise high-efficiency substitute for a bigger and heavier V6.â€
In May 2011, GM has introduced the Electronic Returnless Fuel System on the Cruze model, which increases fuel economy by two percent compared to vehicles with a standard fuel system.
Buick is GMâ€™s modern luxury brand offering vehicles with sculpted designs, luxurious interiors with thoughtful personal technologies, along with responsive-yet-efficient performance.
Will the move commercially benefit the firm?
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