Trionic

Trionic is an engine management system developed by Saab Automobile. It consists of an engine control unit (ECU) that controls ignition timing, fuel injection, and acts as a boost controller.The name 'Trionic' is a portmanteau of the numerical prefix 'tri-' (meaning 'three') and 'ion' from the fact that it uses ion current. This ion current is measured by the spark plugs between combustion events which acts as a sensor for knock, misfire and synchronization detection. The ion current stream which was developed within the ion sensing system due to combustion can be deduced by monitoring the secondary current of the ignition coil. Using the value and wave shape of the current, after the actual spark event, the quality of the actual combustion process is determined, thus allowing the engine control unit to optimize the timing of the spark for the best engine performance while keeping emissions low on a much wider range of rpms. Since Trionic 7, the throttle and thereby the air charge has also been electronically controlled, but the name "Trionic" was not changed accordingly as it was determined that the name had value.

Trionic is an engine management system developed by Saab Automobile. It consists of an engine control unit (ECU) that controls ignition timing, fuel injection, and acts as a boost controller.The name 'Trionic' is a portmanteau of the numerical prefix 'tri-' (meaning 'three') and 'ion' from the fact that it uses ion current. This ion current is measured by the spark plugs between combustion events which acts as a sensor for knock, misfire and synchronization detection. The ion current stream which was developed within the ion sensing system due to combustion can be deduced by monitoring the secondary current of the ignition coil. Using the value and wave shape of the current, after the actual spark event, the quality of the actual combustion process is determined, thus allowing the engine control unit to optimize the timing of the spark for the best engine performance while keeping emissions low on a much wider range of rpms. Since Trionic 7, the throttle and thereby the air charge has also been electronically controlled, but the name "Trionic" was not changed accordingly as it was determined that the name had value. ==Models and ECU information== Trionic systems are shortened to indicate their version; for e.g. T5, T7, T8, etc. The engines with T5 had red direct ignition modules which differentiated them visually from the T7 models which had a black ignition module. The ignition module on both T5 and T7 are an integral ignition coil and electronics that plug directly onto the spark plugs without the use of spark plug wires that were typically used in most engines at the time. SAAB Models Utilizing Trionic Engine Management System: 2nd Generation 900 ("NG900") 1994-1998 T5 9000 1994-1998 T5 1st Generation 9-3 1998-2000 T5 (Except Viggen, which is T7) 1st Generation 9-3 2000 to 2002 T7 1st Generation 9-5 1998-2010 4Cyl T7 2nd Generation 9-3 2003 to 2011 4cyl T8 ==Glossary== Sources include: Engine management system SAAB Trionic T5.5 APC, Automatic Performance Control CDM, Combustion Detection Module ECU, Engine control unit EGT, Exhaust gas temperature ETC, Electronic throttle control MAP, Manifold Absolute Pressure MIU, Main Instrument Unit ORVR, On board Refueling Vapor Recovery system PWM, Pulse-width modulation SID, Saab Information Display TCS, Traction control system TPS, Throttle position sensor TWICE, Theft Warning Integrated Central Electronics VSS, Vehicle Speed Sensor WOT, Wide Open Throttle ==References==

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