2008 Mercedes E 350 CGI Improved Efficiency Review

26 Apr 2015 | Author: | Comments Off on 2008 Mercedes E 350 CGI Improved Efficiency Review
Mercedes E 350

Thread: 2008 Mercedes E 350 CGI Efficiency Review

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Mercedes E 350 CGI Improved Efficiency

In parallel with the E 300 BLUETEC, is expanding its model range the E 350 CGI, which features an direct-injection petrol engine a spray-guided combustion process. unit, the world’s first V6 engine with this combustion system and piezo-electric was introduced in the CLS 350 CGI in spring 2006 and is now available for the Saloon and Estate in the E-Class.

Compared to the E 350, remains in the range, the 215 kW/292 hp develops 20 hp more output and 15 metres more torque Nm) while consuming ten percent fuel. On an NEDC average the E 350 CGI which accelerates from to 100 km/h in 6.8 seconds, consumes 8.7 litres of premium petrol per 100 In both model variants the speed is electronically limited to 250

The E-Class as a technological trendsetter.

The sets new technical standards, and features a comprehensive range of equipment which includes the Intelligent Light System, head restraints and adaptive lights. This makes the the safest car in its class. Agility and enjoyment is assured by the DIRECT package with a direct ratio and a new suspension setup.

E 350 CGI: More performance and fuel consumption thanks to direct petrol injection

petrol injection at 200 bar Fast injectors for precise mixture

Lean, economical stratified even at high speeds

Considerably reduced exhaust

In the E-Class too, Mercedes-Benz is now the world’s first petrol with spray-guided direct A favourable fuel consumption and performance characteristics are by no means for this direct-injection petrol from Mercedes-Benz. On the contrary, an output of 215 kW/292 hp the six-cylinder delivers 15 kW/20 hp more the V6 with conventional injection as well as four percent torque.

At the same time, to the highly efficient V6 petrol with port injection and variable valve control, has achieved a further fuel of around ten percent according to The E 350 CGI consumes 8.7 to 9.2 litres (Estate: 8.9 – 9.4 per 100 kilometres. This means for all its outstanding economy, the V6 engine a superior driving experience is unprecedented in the six-cylinder class: the E 350 CGI only 6.8 seconds (Estate: 7.0 to accelerate from zero to 100 and is capable of a top speed of 250 km/h limited).

Key figures for the new CGI engine at a

– Displacement 3498 cc, ratio 12.2. 1

– 215 kW/292 hp at 6400 rpm

– torque 365 newton metres at to 5100 rpm

The trailblazing injection with which the Stuttgartbrand is again asserting its role as a trendsetter, ensures far superior utilisation and therefore a higher efficiency than the previous, direct injection. The new Mercedes consumes the fuel almost which also means emissions. The result is a superior experience with outstanding

This new concept will the basis for future engine in this performance class.

technology: fast and highly piezo-electric injectors

The key components of innovative, spray-guided direct injection system are fast, precise piezo-electric injectors. invention has given rise to every advance in spray-guided technology.

The developers of the direct injection unit have even greater use of the positive of piezo-ceramics for the CGI engine, namely performance and speed. In contrast to a injector, where the actuator operates a valve, the piezo-module of the unit controls the needle The piezo-… is therefore directly into a needle …, determining the valve flow.

direct operation allows … settings, and charge at the piezo-actuator also ensures a fuel flow throughout the period. Thanks to its extremely … characteristics, piezo-technology produces a highly reproducible formation a major precondition for control of the combustion process.

a uniform, perfectly formed jet of

The developers of the new direct petrol engine devoted painstaking to the shape of the fuel jet. was perfected using an innovative tip which opens outwards each injection cycle, the fuel through an annular measuring only a few micrometres. The is formed by the contours of the aperture and the

The result is a uniform, hollow-based of fuel under all operating which also retains its when the electronic engine system alters the angle of the camshafts or the length of the intake when high performance is The mixture formation itself is as important. A swirl effect at the and within the cone of fuel air particles into the fuel ensuring a fuel/air mixture optimal ignition characteristics.

Thanks to response times fractions of a millisecond, the piezo-electric also allow the multiple per power … that are for lean-burn operation, and provide an precondition for the engine’s exemplary consumption with this and highly efficient control of the process. This is because inject the fuel into the chambers several times in during each power thereby significantly improving the formation and ignition characteristics. is faster, more uniform and complete than after injection – which that the thermodynamic efficiency of the is greatly improved and untreated (hydrocarbons) are reduced by more half.

Pistons with formed crowns optimised in simulations assist the injection by holding the lean mixture at the ignition point, preventing it spreading towards the cylinder In this way the piston shape a further contribution to almost fuel combustion, and therefore the fuel consumption and emission of the direct-injection petrol engine.

fuel injection

The high pressure of 200 bar also plays an part in the constant stability of the jet. To achieve this, the system of the new Mercedes V6 engine is to that of a modern diesel with common-rail technology. Its is a newly developed high-pressure which distributes the fuel to the two steel rails on the cylinder as required.

The piezo-electric injectors are on these.

Mercedes E 350

This system the fuel injection pressure of a port injection system by 50 times. The pump delivers to the rails during every injection cycle, building up pressure. As the fuel is delivered in way, there is a slight, fall in pressure during other injection cycle, the mean pressure for all the injectors around 200 bar.

A volume control valve that only the fuel required for the engine’s current point is delivered, which the output demanded of the high-pressure as required.

Surplus fuel back via a water heat-exchanger and with the fuel flowing the tank of the E 350 CGI. The low-temperature circuit of the injection system cools the electronic control of the direct-injection petrol engine, manages all the operating processes of the V6.

plugs perfectly placed at the of the fuel/air mixture

Finding the location for the spark plugs was challenge which required flow calculations and tests. To that the ignition spark rapidly and reliably, the spark must reach the fuel/air mix but no direct contact with the fuel, otherwise carbon will build up over

To meet both requirements, the injector of the CGI engine projects the middle of the combustion chamber, roughly in the position occupied by the plug in a port injection The spark plug has been closer to the exhaust valves, it can reach and ignite the combustible at the edge of the swirling fuel/air A cross-flow cooling system in the head ensures that the plugs and injectors always within the best possible range.

Stratified charging at higher loads and engine

The exemplary fuel economy of the petrol engine is in large due to the use of stratified charging. This that the engine operates a high compression ratio and a lean mixture, and therefore economically. The fuel is injected the air compressed by the piston at a relatively stage.

Thanks to multiple injection, lean-burn operation of the CGI engine Mercedes-Benz has also become at higher engine speeds and higher load conditions: each power … the chambers are supplied with several times in succession fractions of a second, significantly mixture formation, combustion and consumption. The advantages of stratified could previously only be under low partial load but the V6 unit in the new E 350 CGI still operates in mode at speeds in excess of 120 only switching to so-called mode with a fuel/air of 1:14.6 (lambda = 1) at a later

With an anticipatory style of and at a roughly constant speed, the CGI of the E 350 CGI betters the fuel consumption of the engine with conventional technology by up to 1 litre per 100 kilometres on roads and motorways. This to a fuel saving of up to ten percent.

effect: low untreated emissions and exhaust temperatures

The combustion developed by Mercedes engineers, several injection pulses in succession per power …, benefits the smooth running and exhaust emissions of the V6 engine. have shown that emissions (hydrocarbons) are reduced by than half during the phase.

Precisely controlled and combustion also allows temperatures to be achieved in the exhaust which ensures that the converters reach their operating temperature more The direct-injection petrol engine an exhaust temperature of more 700 degrees Celsius just seconds after a cold Exhaust gas aftertreatment is by two close-coupled, catalytic converters with lambda control which into operation immediately cold-starting.

Mercedes-Benz reduces nitrogen emissions in two ways: with an controlled, cooled, twin-pipe gas recirculation system, which up to 40 percent of the exhaust gases to the depending on the engine’s operating and by two underbody Nox storage-type catalytic During lean-burn operation converters absorb the nitrogen and release them during regeneration phases, so that pollutants react with the exhaust gas constituents to produce nitrogen. Sensors located and downstream of the catalytic converters their operation.

Otherwise the new CGI is equipped with the same, high-tech package as its opposite with conventional petrol This includes four-valve variable camshaft adjustment for the and exhaust sides, a two-stage duct, a balancer shaft and heat management with a thermostat.

The crankcase and cylinder of the six-cylinder unit are made of while the cylinders feature in low-friction, dimensionally stable and aluminium-silicon technology. All the fuel components of the CGI engine are of stainless or brass; the rails on the two banks of and the housing of the high-pressure pump are of stainless steel.

The new E 350 CGI operates on premium petrol, and has the potential to future exhaust emission thanks to its state-of-the-art technology. c

Mercedes E 350
Mercedes E 350
Mercedes E 350
Mercedes E 350
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