Press Release
Driving dynamics tailored to driver requirements Mercedes-Benz also offers a newly developed system in the four, six and eight-cylinder CLK-Class models, which recognises individual driving styles and adapts the drive characteristics of the engine accordingly, thus further adding to the scintillating, dynamic driving experience. For those that fancy themselves as racing drivers, the ECU does its best to please, providing superlative accelerator response. If, on the other hand, the computer detects a driver looking for comfort rather than speed, it adapts the ECU control characteristics, harmonising the engine settings to suit this particular style of driving. To ensure there is no doubt when detecting the driving style or the driver's requirements, the system monitors the pedal movements extremely closely and records every instance of acceleration before adapting the pedal characteristics. This is a continual step-by-step process which ensures that the driving characteristics never contradict the driver's expectations. In the case of a sporty driving style, the pedal characteristics change so that, although pedal travel may remain the same, the throttle valve is opened further than would usually be the case. The engine therefore reacts more instantaneously to driver input and is quicker to provide maximum acceleration. If a more comfort-oriented driving style is detected, the ECU sets flatter pedal characteristics. In this instance, although the pedal travel remains the same, the throttle valve opens more slowly than usual and acceleration is smoother. Assuming the CLK 500 is being driven at 120 km/h in third gear, for example, and the ECU has detected a sporty driving style, the accelerator pedal only needs to be pressed halfway to the floor to obtain an effective acceleration of over 80 percent. If the driving style is more comfort-oriented, this degree of acceleration potential is not obtained until the accelerator has been pressed approximately 75 percent to the floor. CDI diesel engine with fuel consumption of just 6.7 litres per 100 km The CLK 270 CDI is the first state-of-the-art direct diesel injection engine Mercedes-Benz has offered its customers in the coup?????????????????? segment. What really makes it stand out, alongside the high torque, is the extremely low fuel consumption. In terms of acceleration and top speed, the new CDI Coup?????????????????? is therefore on a par with the V6 CLK 240 model. The superb torque characteristics ensure that the five-cylinder engine always reacts instantaneously to driver input, accelerating immediately. For instance, the maximum torque of 400 Newtonmetres is available from just 1800 rpm and is kept constant until 2600 rpm. With so much bottom-end torque, the CLK 270 CDI accelerates from 0 to 100 km/h in just 9.2 seconds and from 60 to 120 km/h (in fifth gear) in a mere 12.6 seconds. The direct injection diesel engine's power curve reaches its summit ??????????????????????????????????????? 125 kW/170 hp ??????????????????????????????????????? at 4200 rpm. However, the five-cylinder model delivers low fuel consumption of just 6.7 litres per 100 kilometres (NEDC combined), an astonishing figure given the impressive performance figures. As is the case with all diesel engines in the Mercedes-Benz passenger car line-up, the new five-cylinder version is crammed with technical refinements:- The common-rail injection system keeps the injection pressure of up to 1350 bar constant in the common fuel rail, upstream of the cylinders, at all times. And it meters the injection quantity according to requirements, depending on the engine load and speed.
- The intake system operates using a hot-film air flow sensor that enables accurate analysis of the air intake. This is important for ensuring precise control of the exhaust gas recirculation and, therefore, a reduction in nitrogen oxide emissions.
- The engine ECU controls all the processes within the sophisticated CDI engine and, thanks to a databus network, also uses information provided by other control units.
- The intercooler cools the intake air, thus enabling the engine to deal with greater quantities of air, for high torque and power output.
- The four valves per cylinder allow the injector nozzles to be positioned centrally so that the fuel can be evenly dispersed in all directions within the combustion chamber. This makes combustion more complete than is the case in engines with two valves per cylinder, leading to lower exhaust emissions.
- The VNT turbocharger ensures a fast build-up of charge pressure at low revs thanks to variable turbine geometry. This noticeable benefits of this are improved cylinder charging and, consequently, higher torque.
