Interactive Vehicle Dynamics (IVD)

The ABS module monitors the stability control sensor cluster and the steering wheel rotation sensor and calculates if the vehicle may be approaching a situation where vehicle stabilization is needed. If such a situation exists, the ABS module activates the interactive vehicle dynamic (IVD) system to apply preemptive action. When activated, the IVD system adjusts the brake torque at specific wheels in response to direct measurement of the driver intended vehicle motion. By adjusting brake torque, the system can reduce the cornering forces on the vehicle.

Information from the stability control sensor cluster is fed into the ABS module. The module uses information from the wheel speed sensors, the throttle position sensor, the steering wheel rotation sensor and the sensor cluster to measure the change in vehicle direction. If the module determines from all these inputs that conditions exist for a potential instability event, the system applies one or more brakes and reduces engine torque to make the vehicle more stable.

The ABS module constantly monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering input and brake application with that of the actual vehicle motion. The system does not activate when the vehicle is traveling in reverse; however, the ABS and traction assist continue to function as usual.

The stability/traction control switch allows the driver to control use of the stability assist system. This is independent of the ABS function, which cannot be switched off by the driver. The stability assist system status is indicated by a stability assist warning lamp in the stability/traction control switch. An illuminated stability/traction control switch indicates that the stability assist system is switched off. The anti-lock brake function continues to work as designed unless the yellow ABS warning indicator is also illuminated. Normal braking function always occurs, unless the red brake warning indicator is illuminated.

When stability assist activates, any of the following can occur:

• A rumble or grinding sound much like ABS
• A small deceleration or a reduction in the acceleration of the vehicle
• The stability assist indicator flashes
• A vibration is felt in the pedal much like ABS