1994-2002 [Subscribe to Daily Digest] |
Per the Saab literature, the Saab Trionic system is much more sophisticated than the older stand alone APC system. Please note that the fuel injectors and ignition timing can be adjusted separately for each cylinder.
Saab Trionic Engine Management System
Saab Trionic T5 engine management system uses a computer capable of over two million calculations per second. The heart of Trionic, a 32-bit microprocessor, monitors and simultaneously controls the Direct Ignition timing, air/fuel mixture ratio and turbo boost pressure, enabling Saab to control the engine's performance, economy and emissions with great precision. Rather than utilizing an engine knock sensor, the Saab Trionic system analyzes the combustion process by applying a weak voltage across the gap of every spark plug after each combustion to measure the degree of ionization in the cylinders. The amount of current flowing back to the control unit is dependent upon the number of ions that have been formed, which provides a measure of whether the air/fuel mixture has ignited and burned correctly. If not, the system adjusts the fuel quantity, the Direct Ignition timing or the turbo boost pressure. By determining the precise amount of fuel required during combustion and precisely regulating its injection into individual cylinders, the adaptable Saab Trionic system manages each element of the combustion process to ensure that each drop of fuel is used to develop the most power possible at absolute maximum efficiency.
The next evolution of the Saab T5 engine management system is the Trionic T7 engine management system incorporating electronic throttle control used in the Saab 9-3 and 9-5.
For a sample of the theory involved, try this link –
http://www.fs.isy.liu.se/~larer/Projects/main.html
posted by 208.49.241...
Spark-Advance Control by Ion-Sensing and Interpretation
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