Saab 2007 owner manual Electronic Stability Program ESP, How the ESP system works

Electronic Stability Program (ESP®)

WARNING

When driving normally, the ESP® system will help to improve the stability of the car. This does not mean that car can be driven faster. The same care and prudence as normally applied should be displayed on cornering and when driving on slippery roads.

The system employs both the antilock brak- ing system (ABS) and the traction control system (TCS). It is a system that helps the driver to stabilize the car in unusual circum- stances that would otherwise be more diffi- cult to handle.

How the ESP® system works

The system can help to prevent the car from skidding by braking one or several wheels independently of the driver. The engine output is then also reduced to prevent the driving wheels from spinning. The car has sensors that measure wheel speed, yaw acceleration, lateral acceleration, steering wheel position and braking pressure. The values provided by these sensors are used to calculate the actual direction of the car. If this direction does not agree with that intended by the driver, calculated from the

steering wheel position, the ESP® is engaged.

The ESP® system improves the driver’s chances of retaining control over the car in critical situations.

To ensure that the system works as designed, the dimensions of all four tires must be the same.

Starting and driving 163

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Increased stability with ESP® .

The system applies the brakes to the wheels as shown in order to reduce the likelihood of the car skidding