Land Rover Discovery: Autonomous Emergency Braking (AEB)

The Autonomous Emergency Braking (AEB) system can be operated by enabling and disabling the system via the Insrument Cluster (IC) menu. The AEB system also becomes operational when the vehicle is in the forward motion at speeds between 5 kph (3 mph) and 80 kph (50 mph).

The AEB system interacts with other vehicle systems for key data and functionality, relying on data communication exchanges between the following modules:

• Steering Angle Sensor Module (SASM) - Steering angle and rate of change.
• Restraints Control Module (RCM) - Lateral acceleration and yaw rate.
• Image Processing Control Module (IPCM) - Collision risk detection.
• Anti-lock Brake System (ABS) control module - Braking control and vehicle speed.
• Engine Control Module (ECM) - Accelerator Pedal Position (APP) and torque control.
• Head Up Display (HUD) - Warning message.
• Instrument Cluster (IC) - Warning message.

This information is exchanged using the High Speed (HS) Controller Area Network (CAN) powertrain and chassis bus and will also use the Gateway Module (GWM) and Medium Speed (MS) CAN comfort bus.

The AEB system uses a four stage sequence of which it operates:

1. Driver Warning - Before braking is engaged, an audible warning is sounded and a visual warning is displayed in the instrument cluster indicating that a collision risk has been identified, but is still avoidable by the driver. The visual warning message is also displayed in the Head Up Display (HUD) if fitted.
2. Brake Precharge - If the time until collision becomes shorter, but still avoidable, the system applies a small amount of pressure on the brakes to fill the gap between the pads and discs, ensuring the best braking performance if the driver reacts to the warning.
3. Collision Mitigation - Having identified a collision risk, either static or travelling in the same direction, the function will apply the brakes, mitigating the collision. The operational speed range is between 5 and 80 km/h (3mph and 50mph).
4. Message on Instrument Cluster Post Braking - The instrument cluster displays a message to confirm that the Intelligent Emergency Braking (IEB) function has been activated.

The AEB system will not be operationable if any the followlng are present:

• Poor camera visibility:

• Fog, heavy precipitation, soiled windscreen, etc.

• System fault detected.
• Forward collision warning velocity outside range: 30-80 km/h (18-50 mph).
• IEB velocity outside range: 5-80 km/h (3-50 mph).
• Dynamic Stability Control (DSC) is switched off.
• The vehicle is cornering sharply

CONTROL DIAGRAM

BLINDSPOT MONITORING - CONTROL DIAGRAM

A = HARDWIRED; U = PRIVATE CONTROLLER AREA NETWORK (CAN) BUS; AM = HIGH SPEED (HS) CAN CHASSIS BUS; AP = MEDIUM SPEED (MS) CAN COMFORT BUS.

1. Left Side Blindspot Monitoring Control Module (BMCM)
2. Right Side Blindspot Monitoring Control Module (BMCM)
3. Instrument Cluster (IC)
4. Anti-lock Braking System (ABS) Control Module
5. Gateway Module (GWM)
6. Right Side Door Mirror Warning Alert Icon
7. Right Side Door Mirror System Status Warning Indicator
8. Ground on Right Side BMCM
9. Ground on Left Side BMCM
10. Power Supply
11. Left Side Door Mirror System Status Warning Indicator
12. Left Side Door Mirror Warning Alert Icon

IMAGE PROCESSOR CONTROL MODULE (IPCM) - CONTROL DIAGRAM

A = HARDWIRED; AM = HIGH SPEED (HS) CONTROLLER AREA NETWORK (CAN) CHASSIS BUS; AP = MEDIUM SPEED (MS) CAN COMFORT BUS.

1. Image Processor Control Module (IPCM)
2. Anti-lock Braking System (ABS) Control Module
3. Gateway Module (GWM)
4. Instrument Cluster (IC)
5. Head Up Display Control Module (HUDCM)
6. Ground
7. Power Supply

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