DSA System Overview (B4204T2 CVVT; 2000): General
Function in the dynamic stability assistance (DSA) anti-wheelspin system
the DSA system assists the driver in holding the vehicle under control under (hard) acceleration, especially when the road surface provides less grip than the driver anticipated.
It also makes progress possible in very slippery conditions, which would not otherwise be possible without dynamic stability assistance.
Unlike the SRS-, ABS- or SIPS-systems, the DSA system is not a safety system. It is an aid to improve control of the car.
The DSA system can be switched off, but is automatically engaged every time the ignition is switched on.
A warning lamp in the dashboard indicates the status of the DSA system.
The DSA system consists of a single control module. This control module calculates wheelspin in the driven wheels from the information about the speed provided by the ABS control module. From this information the DSA control module calculates the torque reduction that is required. This information is transferred to the engine control module (ECM) which decreases the torque on the driven wheels to the normal driving conditions.
The DSA control module does not have sensors of its own. It uses the ABS system or engine control module (ECM) sensors.
The DSA control module can be activated at all speeds, both when the car is moving forwards and when it is moving backwards.
There are no functional similarities between the DSA system and the TRACS system.
- The TRACS system uses wheel braking to prevent wheelspin in one of the front wheels when the car moves off.
- The DSA system decreases the engine torque to prevent wheelspin on one or both of the driven wheels in all driving conditions.