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Home >> Saab >> 2001 >> 9-3 Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> TC/Abs System Version 5.3 - Repair >> Technical Description Control >> TCS function >> High speed
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High speed

Fig 1: Low Speed Graph
G03505665Courtesy of SAAB-SCANIA OF AMERICA, INC.

At 22 km/h (13.5 mph), the TCS function changes its way of working and starts to modulate using engine torque limitation of the wheel that first starts to spin, i.e. the wheel with the lowest friction.

The limit for modulation by brake application lies somewhat higher, which is to say that braking is used on the spinning wheel when engine torque limitation is inadequate.

Braking is used at speeds up to 100 km/h (62 mph).

Primary limitation of engine torque means that no extra tractive force is transferred to the outer wheel when cornering. The outer wheel then has a sufficient margin of grip to take up steering forces to the full. The driver avoids being taken by surprise as the front wheels suddenly lose traction.

At 22 km/h (13.5 mph), wheel spin is allowed to reach 2 km/h (1.2 mph) or about 9%. After that, the curve rises in a straight line to 150 km/h (93 mph) where a wheel spin of 5.2 km/h (3.2 mph) or about 3.5% is allowed. At 150 km/h (93 mph), the curve breaks again and permissible wheel spin will follow the increase in speed proportionally at about 3.5%.