Driver Assistance Functions

Depending on the equipment specification, two driver assistance functions that act on the longitudinal dynamics of the vehicle can be integrated in the ICM control unit:

• Cruise control with braking function  (Dynamic Cruise Control, DCC) and
• Active cruise control with stop&go function  (ACC Stop&Go).

The Adaptive Brake Assistant function is included in the same equipment package as ACC Stop&Go.

The ACC Stop&Go function has been integrated into the ICM control unit in the F01/F02. This dispenses with the need for a separate LDM control unit. The DCC function that is calculated in the Dynamic Stability Control in the E70, for example, has been accommodated in the ICM control unit of the F01/F02.

Fig 1: Input/Output Signal Diagram - Driver Assistance Systems - Longitudinal Dynamics

Courtesy of BMW OF NORTH AMERICA, INC.

The ICM control unit performs an additional important function for the Lane Departure Warning  and Active Blind Spot Detection  driver assistance systems. As both systems warn the driver via a vibration in the steering wheel, a coordinator function is required. This is integrated in the ICM control unit.

The ICM control unit generates a reference value for the vibration based on the warning requirements for the lane departure warning (KAFAS control unit) and the lane change warning (SWW sensor). The amplitude of the vibration varies depending on what triggered the warning.

The reference value is transmitted to the steering column switching cluster via the FlexRay bus system then put into effect via the steering wheel module (LRE) or the vibration actuator in the steering wheel.

The Input/Output graphic below is intended as an overview only.

Fig 2: Input/Output Signal Diagram - Coordination Of Steering Wheel Vibration

Courtesy of BMW OF NORTH AMERICA, INC.