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, Mon, 27 Sep 2004 14:28:39
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Warning, what follows is a rather lengthy overview of the T7, but the bottom line is that if you put any equivalent car on a dyno and put the pedal down, you will get the same results regardless of how the cars were previouslyt driven, given other factors such as fuel type, plug type, air pressure, humidity, etc. are equal.
As for the Trionic learning from you, I have seen posts from some on this board that claim the Trionic can be "convinced" to change its ignition mapping to a more performance oriented one by performing a few hard up-hill accelerations under wide open throttle or by disconnecting the battery for a few minutes. I have yet to find any actual documentation on this but the theory goes that the OBCII specs allow for short and long term averaging on emmisions which the T7 uses. These combine to control the engine with minimal pollution in mind, not maximum power. There is an allowance for the "wide open throttle" condition that can ignore the short term or long term average (I forget which) so more power can be produced in the short term. This still gets combined with the other average though. So in theory, by resetting the ECU and constantly driving at wide-open-throttle, you could get maximum power. But I don't think its actually possible in real life, and there are other factors that way in heavier in the engine management system anyway.
The following is also from this site (not from me):
The Saab Trionic 7 (T7) engine management system in the 9-5 Aero is controlled by a 32-bit microprocessor that is capable of performing two million calculations per second. It monitors and controls the direct ignition, fuel injection, turbo boost pressure and throttle setting to enhance engine performance and eliminate turbo lag. The system continually adjusts the calibrations to maximize engine performance - compensating for a number of variables including fuel quality, altitude and more.
Since Trionic 7 provides electronic throttle control, it overcomes the inertia present in a large turbocharger and eliminates turbo lag by manipulating the throttle position. T7 opens the throttle further than the driver has requested - therefore providing more torque from the engine. It's an electronic slight of hand, but accomplishes the driver's request for torque on demand and immediate response. All 2000 Saab models feature Trionic 7.
And from another site:
http://media.gm.com/events/99/frankfurt/saab95.htm
The engine management system of the Saab 2.3 Turbo Ecopower is the latest version of the Saab Trionic 7, which was developed in-house by Saab and was launched in its first version back in 1992. The Saab Trionic 7 system is controlled by a 32-bit microprocessor which is capable of performing two million calculations per second. The microprocessor simultaneously monitors and controls the ignition timing, fuel injection, boost pressure and throttle setting. Control is adaptive, which means that the system adjusts the calibrations to suit the continually changing needs of the engine.
The Saab Trionic 7 system analyses the combustion process by measuring the ionization in each cylinder by means of the spark plugs. A weak current pulse is applied across the electrodes of each spark plug after every working stroke of the piston. The current sent back to the control unit is dependent on the number on ions formed, which provides a measure of the combustion process in each cylinder. The ionization voltage reveals whether the fuel/air mixture has been ignited and burned correctly. If not, the system adjusts automatically. The Saab Trionic system is able to control the fuel flow and the ignition timing of each cylinder individually. This is an accurate way of controlling the engine - far better than using averages of measurements carried out at only one point.
posted by 198.6.208...
, Mon, 27 Sep 2004 14:28:39
, Tue, 28 Sep 2004 10:26:16
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