152 4-5 Driving Auxiliary Functions
■ When the vehicle goes into or out of a curve, the target selection may may
delay or get hindered. In these cases, the ACC may brake late or
unexpectedly.
■ When the vehicle is running on a sharp curve such as a serpentine road, as
the sensor may lose detection of the vehicle ahead in a few seconds due to
limited vision field of the sensor, the ACC may accelerate the vehicle.
■ If the vehicle with ACC activated is too close to an adjacent lane (or another
vehicle on an adjacent lane is too close to the lane on which the vehicle
with ACC activated is running), the ACC may respond to such other vehicle
and brake.
■ If another vehicle changes lane to the lane on which the vehicle with ACC
activated is running, and falls within the detection range of the radar, the
ACC will recognize it as a target vehicle and respond on this basis. In this
case, the ACC may brake heavily or late.
■ In some circumstances, the detection may be affected or delayed. If the
radar reflection section of the target is too small (the target may be a
bicycle, carriage or pedestrian), there is a risk that the system cannot
identify the distance from the vehicle ahead, resulting in late response or
failure to respond to these target vehicles. In these cases, the driver needs
to control the vehicle speed. Moreover, the detection may be affected by
noise or electromagnetic interference, resulting in delay or interference.
■ When the vehicle runs on a different line to a vehicle ahead with a too small
overlap ratio, the ACC system cannot identify such vehicle ahead as the
target vehicle; in this case, the driver should keep control of the vehicle.
■ When the vehicle follows a vehicle ahead to stop, in very few cases, the
ACC system cannot identify the rear end of the vehicle ahead but the lower
rear end of the target (e.g., the rear axle of a truck with high chassis or
bumper of a vehicle). In these cases, the ACC system cannot guarantee a
proper distance for stopping and the driver must stay alert and always get
ready to brake.
■ When the ACC is activated with the vehicle being stationary, the system
will identify a stationary obstacle in front of the vehicle as a vehicle and
keep stationary to ensure starting safety of the vehicle and avoid collision
with a stationary target caused by unexpected starting. However, this
function cannot cover all obstacles, so the driver must ensure that there are
no obstacles or other traffic participants in front of the vehicle.
■ The radar sensor may be affected by vibration or collision, resulting in
performance reduction of the ACC system. In this case, contact a BYD
authorized service provider.
■ Radar is installed in the front area of the vehicle. Pollutants blocking the
visual field will interfere with expected functions. ACC will be deactivated
when snow accumulates and completely covers the sensor. The system
will send its quit information to the driver via the man-machine interface. At
this time, remove the pollutants and restart the vehicle, or drive along a
normal road for a certain distance to return system functions to normal.
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