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Old 02-24-2006, 01:51 PM   #1
johnei
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Member#: 70272
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Chicago
Default Mercedes CLS 350 CGI

2007 CLS 350 CGI - 31 mpg
via leftlanenews


Quote:
Mercedes today unveiled the 2007 CLS 350 CGI with Stratified-Charged Gasoline Injection. According to the company, it's the first car to offer a gasoline engine with piezoelectric direct injection and spray-guided combustion. The technology increases output while simultaneously improving fuel economy. The main advantage of the CGI engine lies in the stratified operating mode from which it takes its name. In this mode, the engine runs with high excess air and thus excellent fuel efficiency. The latest iteration of this technology makes it possible to extend this lean-burn operating mode to higher rpm and load ranges, for high-performance gasoline vehicles. Fuel consumption for the CLS 350 CGI is 9.1 litres per 100 km (31 mpg).

How it works

During each compression stroke, a series of injections takes place, spaced just fractions of a second apart. This has the effect of significantly improving mixture formation, combustion and fuel consumption. While stratified charge operation was previously only possible in the low part-load range, the new Mercedes direct-injection engine can still operate in this lean-burn stratified mode at speeds in excess of 120 km/h.

When driving on main roads and motorways at largely constant speed and with proper anticipation, the CGI engine outperforms the fuel economy of the six-cylinder engine with conventional injection technology by up to 1.5 litres per 100 km, a saving of up to 15 percent.

The most important components of this innovative direct injection system are the fast-acting, high-precision piezoelectric injectors. The piezoelectric valves have injectors which open outwards to create an annular gap just a few microns wide. This gap shapes the fuel jet and produces a uniform, hollow-cone-shaped spray pattern. The microsecond response times of the piezoelectric injectors enable the system to deliver multiple injections per compression stroke, and thus for lean-burn operation.
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