Computerized Engine Controls: Notes

The 911 Carrera, is equipped with Bosch Digital Motor Electronic (DME) engine control system. See Fig 1 . The DME system uses various data sensors to monitor intake air volume, engine speed, crankshaft position, coolant temperature, intake air temperature, and throttle position. Signals from these sensors, as well as a start signal and oxygen sensor signal, are sent to the Control Unit (CU).

The CU is a microcomputer. Using information obtained from data sensors, the CU determines the correct amount of fuel and optimum ignition timing.