Brake Assistance In The Event Of A Possible Collision
In the event of a possible collision the brake assistance function is designed to aid the driver to quickly achieve the necessary braking effect that he/she requires from the vehicle in situations where there is a risk of a collision. Vehicles equipped with Forward Sensing Module (FSM) (4/80) have a forward facing radar installed in the front section (behind the grille). The forward facing radar (7/203) measures the distance to the approaching vehicle within its range. The Forward Sensing Module (FSM) uses information from the sensor (the radar) to determine the threat of a collision with the vehicle ahead that is moving in the same direction. The Forward Sensing Module (FSM) uses the determined threat of a collision, together with the actions of the driver, to warn the driver via one or several different types of warnings and by engaging increased brake control.
In the event of an imminent collision the Forward Sensing Module (FSM) can carry out the following:
- An audible warning and/or a visual 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.
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.
To activate the brakes the Forward Sensing Module (FSM) communicates with the Brake control module (BCM) (4/16), which in turn activates the hydraulic modulator.
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.