The new Mercedes-Benz SLK: Passion meets efficiency - Daimler

The characteristic map of the new Mercedes-Benz V6 engine is thereforebasically divided into up to four areas:Page 29• idling range homogeneous• low partial load up to 4 bar and 3800 rpm stratified• medium partial load 4 to 8 bar and up to 4000 rpm HOS• high load and entire engine speed range homogeneous or HSPMulti-spark ignition for optimal efficiencyThe third-generation direct injection system also features rapid multi-sparkignition (MSI). Following the first spark discharge and a brief combustionperiod, the coil is rapidly recharged and a further spark is discharged. TheMSI system enables up to four sparks to be discharged in rapid successionwithin one millisecond, creating a plasma with a larger spatial expansion thanconventional ignition. Controlling this rapid multi-spark ignition enables boththe time lapse before the next spark and the combustion duration for therelevant operating point to be optimally adjusted. This provides scope foroptimising the centre of combustion and improving residual gas compatibility,especially during stratified charge operation. Fuel consumption can be reducedby roughly two percent in this way.Fuel savings of up to 4 percent are possible alone by the use of piezo-electricinjection technology in combination with multi-spark ignition, depending onthe driving cycle.Cylinder head with new camshaft adjusterMercedes-Benz engineers modified the variable, hydraulic vane-type camshaftadjusters for the intake and exhaust sides using the basic architecture of thepreceding engine. These now have a larger adjustment range of 40 degreeswith reference to the crankshaft. They were also able to improve thefunctionality, achieving a 35 percent greater adjustment speed andadjustability at an oil pressure as low as 0.4 bar. Despite the betterperformance, this new development excels with significantly smallerdimensions and low weight. For this reason the installation space on thelongitudinal and vertical axes of the engine was able to be reduced by around15 millimetres.Daimler Communications, 70546 Stuttgart/GermanyMercedes-Benz – A Daimler Brand