DME Control Unit DFI, EMS SDI 8.1
DME Control Unit DFI, EMS SDI 8.1
The high-performance electronic engine control unit EMS SDI 8.1 is used for the V8 engines. This control unit has been specially designed to meet the requirements relating to direct fuel injection and VarioCam Plus. Of particular significance here is control of the injectors, since these are the central elements of the direct fuel injection system.
The engine control also controls the throttle valve position (electronic throttle), as this is also a prerequisite for the Porsche Stability Management (PSM) system installed as standard.
The modern DME control unit EMS SDI 8.1 allows sequential injection of fuel into the combustion chamber for each cylinder at precisely defined time intervals. This contributes to minimizing fuel consumption and reducing emissions, even in dynamic driving operation. Each cylinder receives precisely the amount of fuel that corresponds to the engine load condition in order to realize the optimum air/fuel ratio.
In addition, the DME control unit also controls functions such as thermal management, Auto Start Stop and variable deceleration fuel cutoff.
New functions
Thermal management
Auto Start Stop function
Variable deceleration fuel cutoff
Vehicle electrical system recuperation
New components
Differential Hall sensor on the crankshaft
Pressure sensor on the intake manifold
Control unit for electric fuel pump
The DME control unit EMS SDI 8.1 controls the following functions and communicates with the corresponding components, for example:
- Thermal management
- Auto Start Stop function
- Variable deceleration fuel cutoff
- Vehicle electrical system recuperation
- Direct fuel injection (DFI)
- Low-pressure fuel supply
- Returnless Fuel System
- High-pressure fuel supply
- Electronic accelerator pedal
- Electronic throttle with idle speed control
- VarioCam Plus
- Demand-controlled variable oil pump
- Intake system with variable intake manifold
- Stereo lambda control circuits
- Static high-voltage ignition distribution with individual ignition coils
- Cylinder-selective knock control (with 2 knock sensors)
- Differential Hall sensor (detects engine speed, reference mark and engine direction of rotation)
- Pressure sensor on the intake manifold (detects intake manifold pressure and intake air temperature)
- On-board diagnosis for monitoring the emission control system
DME diagnosis options with the PIWIS Tester
The DME diagnostic options largely correspond to those of the DFI control unit EMS SDI 6.1 for the Panamera engines with adaptation to current components/functions (e.g. new sensors/systems) and extension by functions such as Start Stop system, thermal management, etc.
Fault memory
Adaptation to current legal requirements (e.g. USA: Permanent fault memory = Mode A, via Scan Tool).
For the DFI control unit EMS SDI 8 also, a corresponding code comprising letters and numbers is specified in front of every actual value for each actual value filter. This simplifies assignment in the case of different languages. The explanation for individually selected values is also displayed by way of the Help key ( ? ).
Fault deletion counter
40 warm-up phases have to be completed to delete a sporadic fault in order to decrement the deletion counter from 40 to 0.
Actual values
- Mixture adaptations are preserved in the event of an interruption in the power supply
- Extension of actual values (e.g. Start Stop system, thermal management)
NOTE: For the DFI control unit EMS SDI 8 also, a corresponding code comprising letters and numbers is specified in front of every actual value for each actual value filter. This simplifies assignment in the case of different languages. The explanation for individually selected values is also displayed by means of the Help key ( ? ).
Drive links
New drive links ( e.g. for Start Stop system) etc.