Automatic Brakes And Brake Support
The brake support function in the event of a collision risk is designed to aid the driver in obtaining the necessary brake effect that he/she requests from the vehicle in situations where there is a risk of a collision.
Automatic brake function brakes the vehicle in the event of an unavoidable collision without the driver having to touch the brake pedal.
Vehicles equipped with a Forward Sensing Module (FSM) (4/80) have a forward facing camera (27/5) installed by the rear view mirror, and in some vehicles, there is also a forward facing radar (7/203) installed in the front (behind the grille). The forward facing radar is only in vehicles equipped with adaptive cruise control, collision warning, automatic braking/brake support and distance control.
The forward facing radar measures the distance and speed to the vehicle in front that is in its field of view.
The forward facing camera aids in classifying the target within its field of view. The Forward Sensing Module (FSM) uses the information from the sensors (the radar and camera) to assess the threat of a collision with the vehicle in front moving in the same direction. The Forward Sensing Module (FSM) uses the threat assessment of a collision, together with the assessment of what the driver will do, to react to one or several different types of warnings to the driver and also with amplified brake control and automatic brake.
In the event of an imminent collision the Forward Sensing Module (FSM) can carry out the following:
- An audible signal and/or a visual warning (See, see COLLISION WARNING ).
- A low level of self-controlled braking force before the driver has depressed the brake pedal.
- A reduction of the force that is required to achieve the full braking capacity of the vehicle.
- Automatic braking to reduce the collision speed.
The required effect of the function is to maximize the braking effect for the driving conditions where there is a risk of a collision with the approaching vehicle. The brake system achieves maximum efficiency through an increase of braking torque. This reduces the total braking distance without negatively affecting the driver, passengers or the behavior of the vehicle. In the event of a possible collision the brake assistance function triggers braking to minimize delays in the braking system and increases the driver's ability to brake.
In order to carry out a brake activation, brake support or automatic braking, the Forward Sensing Module (FSM) communicates with the Brake control module (BCM) (4/16), which in turn activates the hydraulic unit.
The main component in the function is the hydraulic modulator, which is integrated with the Brake control module (BCM). The primary function of the hydraulic modulator is to create the required brake pressure, which is based on a control signal. The hydraulic modulator is an electromechanical component that receives control signals from the Brake control module (BCM). The Brake control module (BCM) supplies the hydraulic modulator with sufficient control signals based on the driver's actions, the vehicle's speed and the information from the Forward Sensing Module (FSM). The hydraulic modulator achieves the desired brake pressure/brake torque for each wheel, based on the requested brake effect set using necessary information.
The Forward Sensing Module (FSM) requires, except to be able to control the hydraulic modulator, information from the Brake control module (BCM).
Information that the Forward Sensing Module (FSM) requires:
- stoplamp switch
- brake pedal position switch
- speed
- calculated braking force.