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A few quotes... Posted by Larry West [Email]  (#1140)  [Profile/Gallery]
(more from Larry West) on Wed, 8 Oct 2008 20:05:58
In Reply to: ESP theory, kjh, Tue, 7 Oct 2008 18:51:18 Members do not see ads below this line. - Help Keep This Site Online - Signup |
From a Saab service manual regarding ESP...
"ESP (Electronic Stability Program) is a system that regulates engine torque and braking to assist the driver with stabilizing the vehicle during unexpected situations that would otherwise be difficult to handle"
"When ESP engages during a skit, it will counteract the skid by braking one or more wheels without the driver needing to touch the brake pedal. Engine power can also be reduced to prevent wheelspin after the ESP control module requests an engine torque...."
"...The control module continuously calculates the course of the vehicle ACTUAL VALUE (the direction of the vehicle), and compares it with the steering wheel, DESIRED VALUE. If the ACTUAL VALUE does not correspond to the DESIRED VALUE, the system will intervene as necessary by braking one or two wheels and limiting the engine torque."
From what I can tell, ESP should have NO effect, unless it detects the conditions for a skid, as above.
As for the switch:
"The switch can be used to disengage ESP and TCS at speeds below 60km/h (37.5 mph). ESP can be engaged at any speed"
"ESP will remain active during braking as a safety aid for the driver, irrespective of whether the system has been disengaged or not." (if you're sliding, and hit the brakes, even with ESP off, it'll turn on once you hit the brakes.)
ESP can request MORE torque, in addition to less torque.
These are just a few highlights. The full description of operation takes up 32 pages in the MY 2002 NEWS manual from Saab...
_______________________________________ Current: 2002 9-5 Aero Kombi Cosmic Blue 2000 9-5 SE sedan, Imola Red 1990 900S Rose Quartz, Auto Past: 1999 9-5 LPT Combi 1999 9-5 LPT sedan 2002 9-5 Arc 1990 900 5-speed 1986 900 turbo Convertible 1991 9000 turbo 1980 99 GLi 1986 900 turbo 1986 900 S 1991 900 turbo 1984 900 turbo 1976 99 GL
, Wed, 8 Oct 2008 20:05:58 <-- Viewing This Message, Wed, 8 Oct 2008 19:52:47
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