DTC C1702-55: Variant Coding Error: General Description

Autonomous Emergency Braking (AEB) 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. AEB detects forward vehicle with radar sensor.
2. AEB calculates acceleration value according to distance and speed.
3. AEB transmits acceleration request to Electronic Stability Program (ESP)/Electronic Stability Control (ESC) by CAN communication.
4. When deceleration is needed, ESP/ESC performs brake control. But when acceleration is needed, ESP/ESC calculates engine torque request and send it to EMS by CAN communication.
5. EMS 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/LKAS uses a camera sensor to detect vehicles ahead and data fusion. (local CAN)
2. AEB identifies the AEB controllable vehicle 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 ESP/ESC. (CAN communication)
5. ESP/ESC calculates a required torque to implement "required deceleration speed" and then controls the brake control. (CAN communication)