Kia Picanto: Brake System / Assist Emergency Braking(AEB) System

Kia Picanto JA 2017-2021 Service & Repair Manual / Brake System / Assist Emergency Braking(AEB) System

Description and operation
Description
AEB system is designed to help avoid a potential collision or reduce its impact when drivers applies inadequate, delayed or no brakes at all to avoid a collision.
The system detects the risk factors on the road by using the frontal impact sensor and warn the driver and activate the emergency brake to prevent collision or reduce collision speed.
The following is the system control process
1.
Confirm the object to be protected by AEB system (vehicles and pedestrians) by using the analyzed data.
2.
Calculate the speed reduction depending on the speed, distance, existence or nonexistence of preceding vehicle.
3.
Report the "required speed reduction" to Electronic Stability Control (ESC) (CAN Comm.)
4.
ESC performs automatic control after calculating the required torque to achieve "required speed reduction" (CAN Comm.).
Operation

※ The time indicated will be changed according to vehicle speeds.
Step 1: Issue a visual (display) and vocal alarm when a danger is detected.
Step 2: Reduce engine torque and activates AEB when there is a high chance of collision.
Step 3: Activate emergency brake when a collision is imminent.
After stopping the vehicle: Maintain the braking control for a certain time and then release it.
   
Braking power is adjusted depending on the risk levels of collision, but it is released immediately when it detects the driver's action to avoid a collision.
1)
When it exceeded the maximum operation speed.
2)
When it detected driver's action to avoid a collision such as sudden steering changes.
3)
When the shift lever is in R or P
4)
When you pressed the accelerator pedal half way.
   
1)
When you drive at 80km/h or faster, the system does not go to step 3 of emergency braking.
Full auto braking is not available.
2)
While driving at 80km/h or slower on a straight or slightly curved road, the system performs three steps after issuing a warning.
But a collision may occur at 30km/h or faster depending on the road conditions.
3)
While driving at 80km/h or slower on a straight or slightly curved road, after a visual and vocal warning, AEB is activated to reduce the vehicle speed.
4)
At 80km/h or faster, it's impossible to avoid a collision. Offset should be less than 50%.
5)
AEB does not work on the vehicles backing up or resisting.
   
Offset : Rate of non-overlapping on the line between the front driving car and my car
1)
Offset 0% :

2)
Offset 100% :

Components and components location
Components
The following is the configuration of the AEB system.
Detection device (radar) that can recognize potential obstacles in the front.
Human-Machine Interface (HMI) to warn driver or change settings.
Braking system to automatically brake the car

Schematic diagrams
Schematic diagram

Terminal Function

NO.
Terminal function
1
-
2
C-CAN LOW
3
C-CAN HIGH
4
GND
5
IGN1
6
-
7
-
8
-

Repair procedures
Inspection
AEB function ON / OFF switch was included to USM (User Setting Menu) and the state of the factory is ON.
When the IGN On, maintain ON condition by default. And does not reflect the driver settings when next IGN On.
If turned the ESC function Off, the AEB function is turned off.
The ON/OFF for AEB is included in the USM (User Setting Menu) and the default is ON.
While IGN is On, it stays at ON, however, the driver's settings do not last next time when IGN is newly On.
When ESC is Off, AEB is also turned Off.
Removal
1.
Turn the ignition switch off and disconnect the battery (-) terminal.
2.
Remove the front bumper cover.
(Refer to the Body - "Front Bumper Assembly")
3.
Loosen the bolts and then disconnect the AEB unit connector.

Installation
AEB radar
1.
Installation is the reverse of removal.
2.
Perform AEB variant coding
3.
Perform the AEB radar alignment.
Assist Emergency Braking (AEB) Radar Sensor Alignment
AEB system is designed to help avoid a potential collision or reduce its impact when drivers applies inadequate, delayed or no brakes at all to avoid a collision.
In order for the radar sensor to operate correctly, it must be properly aligned parallel to the driving direction of the vehicle.For this reason, the radar sensor alignment procedure must be carried out whenever the sensor has been reinstalled or replaced with a new one.
If the sensor alignment procedure is not performed in the conditions mentioned above, the smart cruise control system may not operate correctly.
   
The AEB radar sensor alignment is required when:
The AEB unit has been reinstalled or replaced with a new one.
The radar sensor or the surrounding parts have been impacted by collision.
The sensor cannot detect a vehicle in front.
The Steering Angle Sensor (SAS) has been replaced or adjusted.
   
If the sensor cannot detect the vehicle in front :
Park the vehicle on a level ground.
Take out heavy luggage from the vehicles’ seats or trunk.
Set all tires according to the specified pressure.
Check wheel alignment.
Check that the front surface of the AEB unit is clean.
Assist Emergency Braking (AEB) Radar Sensor Alignment
1.
Park the vehicle on a level ground.
   
Adjustment may not be accurate if the vehicle and reflector are placed on different ground levels or on a slope.
Perform in an area with minimum clearance of 8 m to the front, 4 m wide, and 1.2 m above the ground.
Remove heavy objects from inside of the vehicle (seating area and trunk).
Ensure that all tires are filled with specified air pressure.
Remove objects (metal plates, resins, etc.) that may cause electric signal interference from the area where sensor alignment is performed.
Be sure that the vehicle is not moved and free from vibration when performing sensor alignment (getting in/out or opening/closing doors).
Check that radiator grille and sensor cover are not dirty.
Check for correct wheel alignment.
Do not turn OFF the power when performing sensor alignment.
Power supplied to the radar sensor must be between 9V~16V.
Temperature in the area where sensor alignment is performed must be between -30~60°C.

2.
Mark the center point on top of wind glass (A).

3.
Mark the center point of emblem (A).

4.
Mount the SCC Calibration Laser [SST No. : 09964-C1200] onto the tripod [SST No. : 09964-C1300].

5.
Install the vertical/horizontal laser [SST No. : 09964-C1200] (A) at least 2.5 m to the front of the vehicle.

6.
Match the vertical line of laser to (A) and (B) using the vertical/horizontal laser (C) [SST No. : 09964-C1200].

7.
Mark (C) at 2.3 - 2.5m (90.55 - 98.42 inch) from (A) in front of the vehicle.

   
If possible, perform calibration at the 2.5m position.
8.
Remove the SCC Calibration Laser [SST No. : 09964-C1200] (B) from the tripod [SST No. : 09964-C1300] (A).

9.
Mount the reflector [SST No. : 09964-C1100] (B) onto the tripod [SST No. : 09964-C1300] (A).

10.
Align the vertical weight (B) of the SCC Calibration Reflector [SST No. : 09964-C1100] (A) with the point (C).

11.
Using the bubble level (B) of the tripod [SST No. : 09964-C1300] (A), set the reflector horizontally.

12.
Set the height of the SCC calibration reflector [SST No. : 09964-C1100] (A) to 336mm (13.22inch).

13.
Visually check again the radar sensor and the surface of the front bumper for the following.
   
Make sure that there is no debris, or reflecting object on the surface of the radar.
Make sure that there is no debris, or reflecting object on the radiator grille.
14.
Connect the KDS/GDS to the DLC of the vehicle and start sensor alignment.
   
If the engine is running, the vibration may cause inaccurate sensor alignment, so perform sensor alignment in IG ON mode.
15.
After correctly selecting the vehicle model, select "FCA Alignment" from the auxiliary functions in KDS Menu.

16.
Perform sensor alignment as indicated on the KDS monitor.

17.
Enter the distance between reflector and radar sensor.

18.
Check radar sensor alignment value
Specification :
Vertical angle : -1.6 ~ -2.4⁰
Horizontal angle : -0.8 ~ +0.8⁰

19.
If the vertical alignment is out of the the tolerance, turn the horizontal adjustment screw (A) or vertical adjustment screw (B) until the alignment is within the tolerance.
Specification :
Vertical angle : -1.6 ~ -2.4⁰
Horizontal angle : -0.8 ~ +0.8⁰
[Front]

[Rear]

   
Use 4pi box when adjusting at the front of radar and use T20 star wrench when adjusting at the rear of radar.
Direction
Adjustment Screw Turning Angle
Adjustment Screw Adjustment Direction
Radar Sensor Moving Angle
Vertical
1 turn (360°)
 Anti-clockwise
-0.6°
1 turn (360°)
 Clockwise
+0.6°
Horizontal
1 turn (360°)
Anti-clockwise
-1.0°
1 turn (360°)
Clockwise
+1.0°

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