2012 911 Section 2-2 11/3/11 10:14 AM Page 17
911 Carrera 911 Carrera S
2.3 DME control unit The DME control unit Continental SDI 9 is installed at the top right of the engine compartment; the wiring harness is routed directly to the engine without any connection points.
DME engine electronics
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The high-performance electronic engine control unit EMS SDI 9 from Continental is used for the 911 Carrera (991) engines. This control unit has been specially designed to meet the requirements for use of direct fuel injection (DFI) and VarioCam Plus. Of particular significance here is control of the injectors, which are central elements of the direct fuel injection system. The engine control also controls the throttle position (electronic throttle) as this is a prerequisite for the Porsche
The modern DME control unit allows sequential injection of fuel into the combustion chamber for each cylinder at precisely defined time intervals. This helps to minimize fuel consumption and reduce emissions, even during dynamic driving. Each cylinder receives precisely the amount of fuel that corresponds to the engine load condition in order to achieve an optimum air/fuel ratio.
Brief overview of DME features New DME components • 6 hole injectors • Differential Hall-effect sensor on the crankshaft • Pressure sensor on the intake manifold for load detection • Tank leakage diagnostic system (NVLD) for USA vehicles
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Stability Management (PSM) system installed as standard.
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New functions of the DME control unit • Thermal management • Auto Start Stop function (Porsche Doppelkupplung [PDK] and manual transmission) • Coasting (vehicles with Porsche Doppelkupplung [PDK] only) • Variable deceleration fuel cutoff
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• Vehicle electrical system recuperation
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