DTC C1633-81: Cluster Invalid Displayed Speed: General Description

Smart Cruise Control (SCC) has additional function which helps to keep safety distance from the car ahead as compared with conventional Cruise Control. Control step is as follows.

1. SCC detects forward vehicle with Radar sensor.
2. SCC calculates acceleration value according to distance and speed.
3. SCC transmits acceleration request to ABS/ESP Control Unit by Controller Area Network (CAN) communication.
4. When deceleration is needed, ABS/ESP performs brake control. But when acceleration is needed, ABS/ESP calculates engine torque request and send it to Engine Control Module (ECM) through CAN communication.
5. ECM performs acceleration control after receiving torque request.

Autonomous Emergency Braking (AEB) is designed to avoid collision or reduce damages from an accident caused by delayed braking or insufficient braking power due to distraction of the driver. System control process is as follows:

1. AEB uses a Radar sensor and LDWS (Lane Departure Warning System, LKAS (Lane Keeping Assist System)) uses a Camera sensor to detect vehicles ahead and data fusion.
2. AEB identifies the AEB controllable status using fusion detection data.
3. AEB calculates required deceleration speed depending on the speed/distance of vehicles ahead.
4. AEB transmits the calculated "Required Deceleration Speed" to ABS/ESP Control Unit through CAN (Controller Area Network) communication.
5. ABS/ESP Control Unit calculates a required torque to implement "Required Deceleration Speed", and then controls the brake control.