Controlling The Adaptive Cruise Control
The function adaptive cruise control is an extension of the existing cruise control. If there is no vehicle ahead, the speed will remain unchanged as for conventional cruise control. Speed is set by the driver in a similar way as for conventional cruise control.
If there is a vehicle ahead travelling at a lower speed than set speed, the speed will adjust itself automatically so that the set time gap to the vehicle ahead is attained. In this case, the adaptive cruise control in Forward Sensing Module (FSM) controls the Engine control module (ECM) and, if necessary, also Brake control module (BCM) to maintain the set time gap.
The time gap to the vehicle ahead is set by the driver in five steps, in the interval 1 to 3 seconds. If no earlier setting has been made, then step 3 of 5 will be used as basic value.
When the system is activated the last selected time interval is used. The value of the time interval is connected to the remote key. In this way every driver maintains their own setting. To change the time interval the driver presses one of the buttons on the Steering wheel switch left (SWSL) to increase or reduce the time interval. The Steering wheel switch left (SWSL) transmits information via LIN communication to the Central electronic module (CEM) (4/56), for the button that is activated. The Central electronic module (CEM) forwards this information to the Forward Sensing Module (FSM) (4/80) via the CAN network.
The function adaptive cruise control is limited to a speed that is higher than approx. 30 km/h.