The Series 50G is Detroit Diesel's first spark-ignited engine. Detroit Diesel's ignition system consists of DDEC III, ignition coils, spark plugs, and wires. DDEC controls the spark.
The Series 50G spark ignited high pressure gas engine utilizes the Detroit Diesel Electronic Control (DDEC) system in conjunction with the Gaseous Fuel Injection (GFI) system, specifically tailored for the Series 50 gas engine, to control combustion. The GFI computerized fuel injection system electronically meters fuel according to demand. A combination of Detroit Diesel and GFI sensors are used to dynamically monitor the engine and environment to provide open loop fueling. In addition to assisting with fuel delivery control, DDEC is used to control the spark ignition system, provide engine shutdown protection, and provide additional safety shut downs for the vehicle fuel system. The DDEC system has been modified to provide optimum operation for the Series 50G engine. The Series 50G electronic control system includes the following enhancements: