Evasive Maneuver Support, Basic Function - GF54.71-P-9902A

Model All (CAR) 

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 
  • Functional restrictions 

General 

Evasive steering support can help the driver if he wants to swerve around, e.g. a pedestrian in a hazardous situation.

If the driver initiates an evasive maneuver by means of a steering movement, the system supports this evasive steering request by specifying the electric power steering with additional, precisely calculated steering torque. This helps the driver avoid the pedestrian in a controlled manner, and afterward makes it easier to put the vehicle back onto a straight course, with additional support from the Electronic Stability Program (ESP®), if required.

Collisions with pedestrians can thus be avoided or the severity of injury can at least be reduced.

Support is always driver-initiated; the evasion direction is specified by the driver. The driver can therefore either go with the system activity or override the system.

Evasive steering support is operated together with the Active Brake Assist via the multimedia system.

Function requirements 

• Engine in operation or drivetrain operational
• ESP® not switched to passive
• No ESP® control intervention (only vehicles up to market launch of model 223)
• Gear range "D" engaged
• Straight-ahead driving
• No trailer operation (vehicles with trailer hitch)

Function 

To assess the traffic situation ahead of the vehicle, evasive steering support evaluates the information from the front radar sensor and the information from the multifunction camera behind the windshield.

The evasive steering support function additionally evaluates the following function-relevant parameters:

• Vehicle speed/direction of travel
• ESP® status
• Electric power steering, status
• Steering wheel angle
• Wheel angle
• Steering wheel torque (only vehicles up to market launch of model 223)
• Tire pressure monitoring system status
• Trailer recognition (vehicles with trailer hitch)

If the system detects a pedestrian and the driver starts an evasive maneuver, the system supports this action.

Evasive steering support is active in a vehicle speed range from approx. 20 to approx. 70 km/h (approx. 20 to approx. 110 km/h from market launch of model 223).

If the road space monitoring function detects further obstacles in the danger zone, the system does not support the evasive steering request from the driver up to the market launch of model 223.

A warning tone sounds when support begins.

The system calculates the additional steering torque, which is implemented by the electric steering in the evasion direction. If physical driving limits are reached as a result of the evasive maneuver, the ESP® also intervenes.

Functional restrictions 

The evasive steering support function cannot always clearly recognize objects and complex traffic situations. Furthermore, the support function will in some cases not be sufficient to avoid a collision.

In these cases, the evasive steering support can react as follows:

• issue a warning or provide support without reason.
• fail to issue a warning or provide support.

	Function schematics
	Assist evasive maneuver, function schematic	Model 118, 167, 177, 243, 247, 293 with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS)) Model 213, 238, 257, 290 as of model year 2021 with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS))	PE54.71-P-2503-97A
		Model 223, 297	PE54.71-P-2503-97B
		Model 192, 206, 214, 232, 236, 254, 294, 295, 296	PE54.71-P-2503-97C
	Additional basic functions
	Brakes, basic function		GF42.00-P-9900A
	Traffic area monitoring, basic function		GF54.71-P-1000A
	Intelligent driving control unit, basic function		GF30.30-P-9890A
	Electronic Stability Program control unit, basic function		GF42.45-P-9890A
	Electric power steering control unit, basic function		GF46.35-P-9890A
	Front multifunction camera, basic function		GF54.71-P-9890A
	Intelligent driving radar sensor, basic function		GF54.71-P-2005A