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Additional info on Saab Trionic T7 in the 9-5.... Posted by REM in Seattle [Email]  (#4)  [Profile/Gallery]
(more from REM in Seattle) on Wed, 12 Jun 2002 17:53:30
In Reply to: Saab Trionic engine management system, REM in Seattle [Profile/Gallery]
, Wed, 12 Jun 2002 16:23:55
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Much of this also applies to the NG900 Trionic T5:
New Generation Saab Trionic
The advanced Saab Trionic engine management system used for the Saab 9-5 engines has been designed by Saab's own engineers, who launched their first "smart" engine management system, the Automatic Performance Control (APC) turbo controller, in 1980. Saab also introduced the industry's first Direct Ignition system in 1985. Saab is one of the few car manufacturers in the world to develop its own engine management systems. In the 9-5, Saab has developed the Trionic engine management system into a new generation known as version 7-the first Saab-made engine control system capable of handling a six-cylinder engine. Similar to the aircraft industry's "fly-by-wire" technology, Trionic 7 now controls the throttle as well as the air/fuel mixture ratio, Direct Ignition and turbo boost pressure, providing a completely new approach to engine control. The brain of the Saab Trionic system is a 32-bit microprocessor capable of carrying out two million calculations per second. The microprocessor is programmed with complex algorithms and theoretical models of the engine to be able to monitor and simultaneously control the Direct Ignition timing, fuel injection rate and intake air flow. Saab's Trionic engine management control system is capable of adapting to always optimize engine performance based on driver demands and the quality of fuel being used. The Trionic system operates using a high-speed data bus to communicate with other systems in the car. This Controller Area Network (CAN) has the capacity to transmit data at up to one million bits/sec. It allows all parts of the system to "talk" to each other at extremely high speed so they can interact when necessary. Because the digital information is identifiable and specific, a whole bundle of conventional wires can be replaced by a single power lead and just one small-gauge data cable. Information on engine temperature, for example, which might be needed for several different processors to function correctly, can be sent around the system and updated continuously as a single message packet, instead of each system gathering its own information signal from its own dedicated sensor or the main controller unit.
Each Cylinder Is Constantly Monitored
The Saab Trionic system also analyzes the combustion process by using the spark plugs for measuring ionization within the cylinders. A weak voltage is applied across the gap of every spark plug after each combustion stroke. The current flowing back to the control unit is dependent on the number of ions that have been formed, which provides a measure of the combustion in each cylinder. Ionization measurement reveals whether the fuel/air mixture has ignited and burned correctly. If not, the system adjusts the fuel quantity, the Direct Ignition timing or the boost pressure. The Direct Ignition timing is also monitored separately in each cylinder. The Saab Trionic system can control each cylinder individually, which is a more accurate way of controlling the engine than by using averages of measurements carried out at only one point. This continuous monitoring enables the fuel energy to be put to optimum use. The result is a reduction in fuel consumption and exhaust emissions. Each fuel injector is controlled individually and the air mass entering the engine is calculated from measurements of pressure, temperature and air mass flow. The processor is so fast that it even checks during the injection phase whether any factors have changed, making in-cycle corrections if required by varying the fuel pulse from a minimum of two milliseconds (1/500th sec) to the complete four-stroke cycle. This makes the control of air/fuel ratio significantly more accurate. The unique Saab Direct Ignition (DI) system has no distributor and no moving parts. Each spark plug has its own miniature ignition coil mounted in a cartridge directly above its terminal, eliminating the need for high-tension leads and protecting the plug insulator from moisture and dirt. This arrangement eliminates starting problems in damp and cold weather and provides a more reliable spark voltage under all conditions. Saab DI uses a capacitive rather than a conventional inductive system to generate the spark firing voltage, which at 40,000 volts is some 40 percent greater than in conventional ignition systems. To insure long spark plug life, the Direct Ignition system is programmed to fire a shower of sparks, at each spark plug electrode, upon engine shut-off to keep them free of any carbon build-up.
posted by 208.49.241...
_______________________________________ REM in Seattle Current: 2013 Volvo XC60 R-Design, Rebel Blue, 3.0L 6-cyl turbo, Automatic 2024 MINI Cooper S Convertible, 2.0L 4-cyl turbo, 6-speed manual Former: 2005 Saab 9-3 Aero Convertible, Steel Gray metallic, 2.0L 4-cyl turbo, 5-speed 1998 Saab 900SET 5-door, Silver, 2.0L 4-cyl turbo, Automatic 1991 Alfa Romeo Spider convertible, Alfa Red, 2.0L 4-cyl, 5-speed 1984 Saab 900T 3-door, Red, 2.0L 4-cyl turbo, 5-speed
, Wed, 12 Jun 2002 16:23:55, Wed, 12 Jun 2002 17:53:30 <-- Viewing This Message
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