DME Control Unit DFI EMS SDI 6.1
Fuel, Exhaust & Engine Electrical
DME Engine Electronics
Development Objectives
- Best in Class driving performance
- High engine power
- High maximum torque
- Low fuel consumption
- Low emissions
- Thermal management
- Start Stop system
- Reduced component weight
An enhanced generation of Porsche V8 engines is used for the new Panamera models:
4.8 l V8 naturally aspirated engine for the Panamera S/S4 4.8 l V8 bi-turbo engine for the Panamera Turbo.
The enhanced and optimized engines used in the Panamera are based on the Cayenne engines. This made it possible to achieve the ambitious targets for fuel consumption and CO2 emissions despite the enhanced performance. A common design engineering process with clearly defined goals permitted use of many identical parts in the naturally aspirated and turbo engines.
DME Control Unit DFI EMS SDI 6.1
Characteristics of direct fuel injection:
- High cylinder charging
- Low knock sensitivity
- High compression ratio
- High-pressure stratified-charge ignition
- Dual injection possible
- Homogeneous operation with engine at operating temperature
General Information
In the case of direct fuel injection, the fuel is injected directly into the combustion chamber, so that the mixture formation takes place almost entirely within the combustion chamber. The direct fuel injection system used in the Panamera engines is based on homogeneous operation when the engine is at operating temperature. The mixture of fuel and air is distributed as evenly as possible in the combustion chamber, thereby enabling optimal combustion. In this process, the fuel is injected directly in the combustion chamber at a pressure of up to 1740 psi (120 bar).
The jet and cone angles of the injectors have been optimized to achieve optimum homogenization across the entire operating range. Within the injector, the fuel jet is swirled (rotated about the longitudinal axis). This rotation forms a cone-shaped cloud of fuel. This results in fine atomization which in turn enables quicker evaporation of the fuel. The heat energy required for this is removed from the air by the fuel evaporation and this cools the air as a result. This reduces the cylinder charge volume and additional air is drawn in through the open intake valve, which in turn improves cylinder filling.
The reduced temperature level also helps to create the prerequisites for the high compression ratio in all Panamera engines, since knock sensitivity and engine efficiency have been improved. The high compression ratio of 12.5:1 for the V8 naturally aspirated engine and 10.5:1 for the V8 bi-turbo engine realized through DFI serves to optimize both engine power and fuel consumption.
