DTC C2721-46: System Calibration Required: General Description

Front Radar (FR_RDR) 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. FR_RDR detects forward vehicle with radar sensor.
2. FR_RDR calculates acceleration value according to distance and speed.
3. FR_RDR transmits acceleration request to Hydraulic Electronic Control Unit (HECU) by CAN communication.
4. When deceleration is needed, HECU performs brake control. But when acceleration is needed, HECU calculates engine torque request and send it to Engine Management System (EMS) by CAN communication.
5. EMS performs acceleration control after receiving torque request.

Front Camera (FR_CMR) 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. FR_CMR uses a radar sensor and Lane Departure Warning System (LDWS)/Lane Keeping Assist System (LKAS) uses a camera sensor to detect vehicles ahead and data fusion. (L-CAN)
2. FR_CMR identifies the FR_CMR controllable vehicle using fusion detection data.
3. FR_CMR calculates required deceleration speed depending on the speed/distance of vehicles ahead.
4. FR_CMR transmits the calculated "required deceleration speed" to HECU. (CAN communication)
5. HECU calculates a required torque to implement "required deceleration speed" and then controls the brake control. (CAN communication)