Method for reducing braking distance

Process for shortening the braking distance of a vehicle equipped with a brake servo unit which during a standard braking action is only triggered by the brake pedal pressure caused by the driver and in case of a critical driving situation is so triggered by a control device that in comparison to the standard braking action an increased amplification factor is set at the brake servo unit, comprising the steps of:

• determining a danger potential by defining the probability that the vehicle to be braked will be involved in an accident, and
• increasing the amplification factor in accordance with the danger potential, wherein the amplification factor is only increased by the control device above a certain threshold value of the danger potential, wherein the amplification factor increased by the control device within the range of the threshold value corresponds essentially to the standard amplification factor available during the standard braking action and is continuously increased as the danger potential increases, wherein the danger potential is determined on the basis of
• one or several parameters influenced by the driver (driver danger potential Λda) or
• one or several parameters induced by a driving situation (driving situation danger potential Λds) wherein the danger potential is calculated according to the following formula:
• Δ da = 1 2 · { 1 - cos ⁡ ( π · min ⁡ ( max ⁡ ( F . ped 1500 , 0 ) , 1 ) ) } ,
• at the same time {dot over (F)}ped represents the change in the braking force.

Process for shortening the braking distance of a vehicle equipped with a brake servo unit which during a standard braking action is only triggered by the brake pedal pressure caused by the driver and in case of a critical driving situation is so triggered by a control device that in comparison to the standard braking action an increased amplification factor is set at the brake servo unit, comprising the steps of:

• determining a danger potential by defining the probability that the vehicle to be braked will be involved in an accident, and
• increasing the amplification factor in accordance with the danger potential, wherein the amplification factor is only increased by the control device above a certain threshold value of the danger potential, wherein the amplification factor increased by the control device within the range of the threshold value corresponds essentially to the standard amplification factor available during the standard braking action and is continuously increased as the danger potential increases, wherein the danger potential is determined on the basis of
• one or several parameters influenced by the driver (driver danger potential Λda) or
• one or several parameters induced by a driving situation (driving situation danger potential Λds),
• wherein the danger potential is determined by using at least one of the following parameters:
• the vehicle speed (v0),
• the vehicle acceleration (a0),
• the distance (d0) to a vehicle driving ahead,
• the relative speed ({dot over (d)}0) in relation to a vehicle driving ahead,
• the relative acceleration ({umlaut over (d)}0) in relation to a vehicle driving ahead or wheelslip information
• wherein the danger potential is determined on the basis of a difference from a permitted maximum acceleration and an actual acceleration
• wherein the permitted maximum acceleration is calculated according to the following formula:
• a cva = - 1 2 ⁢ ( v 0 + a cv0 ⁢ t R ) 2 d 0 - v 0 ⁢ t R - 1 2 ⁢ ⁢ a cv0 ⁢ t R 2 - 1 2 ⁢ ( v 0 + d . 0 ) 2 ⁢ a cv0 + d ¨ 0 ,
• wherein,
• tR is the reaction time,
• v0 the vehicle speed and
• d0, {dot over (d)}0, {umlaut over (d)}0 the distance to the vehicle driving ahead and its differentiations in time.

Process for shortening the braking distance of a vehicle equipped with a brake servo unit which during a standard braking action is only triggered by the brake pedal pressure caused by the driver and in case of a critical driving situation is so triggered by a control device that in comparison to the standard braking action an increased amplification factor is set at the brake servo unit, comprising the steps of:

• determining a danger potential by defining the probability that the vehicle to be braked will be involved in an accident, and
• increasing the amplification factor in accordance with the danger potential, wherein the amplification factor is only increased by the control device above a certain threshold value of the danger potential, wherein the amplification factor increased by the control device within the range of the threshold value corresponds essentially to the standard amplification factor available during the standard braking action and is continuously increased as the danger potential increases, wherein the danger potential is determined on the basis of
• one or several parameters influenced by the driver (driver danger potential Λda) or
• one or several parameters induced by a driving situation (driving situation danger potential Λds)
• wherein the danger potential is determined by using at least one of the following parameters:
• the vehicle speed (v0),
• the vehicle acceleration (a0),
• the distance (d0) to a vehicle driving ahead,
• the relative speed ({dot over (d)}0) in relation to a vehicle driving ahead,
• the relative acceleration ({umlaut over (d)}0) in relation to a vehicle driving ahead or wheelslip information
• wherein the danger potential is determined on the basis of a difference from a permitted maximum acceleration and an actual acceleration
• wherein the danger potential is calculated according to the following formula:
• Δ acve ⁡ ( a cve ) = 1 2 · { 1 - cos ⁡ ( π · min ⁡ ( - min ⁡ ( a cve 0 , 9 · g , 0 ) , 1 ) ) } .