Device and method for preventing rollback of a vehicle on an incline

A device for preventing a rollback of a vehicle on an incline, the vehicle including a brake system, at least one front wheel and at least one rear wheel, the brake system being utilized for influencing a first braking pressure in a first wheel brake of the at least one rear wheel to distribute a braking action between the at least one front wheel and the at least one rear wheel, the braking action being distributed by actuating actuators assigned to the at least one rear wheel so that a differential is set between a second braking pressure in a second wheel brake of the at least one front wheel and the first braking pressure in the first wheel brake of the at least one rear wheel, the device comprising:

• a first arrangement determining whether the vehicle is at a standstill due to the braking action in which the differential between the first braking pressure and the second braking pressure has been set;
• a second arrangement determining whether the vehicle is rolling back from the standstill, and increasing the first braking pressure in the first wheel brake of the at least one rear wheel to inhibit the rollback of the vehicle if the rollback is detected;
• a sensor arrangement generating at least one wheel rotational speed signal which is associated with a rotation of the at least one front wheel and the at least one rear wheel, the sensor arrangement being assigned to the front and rear wheels;
• a third arrangement determining a velocity quantity as a function of the at least one wheel rotational speed signal, the velocity quantity being indicative of a velocity of the vehicle, the first arrangement evaluating the velocity quantity for detecting the standstill;
• and
• a fourth arrangement determining at least one detection quantity for the individual wheels as a function of the at least one wheel rotational speed signal, wherein the at least one wheel rotational speed signal alternates between a first signal value and a second signal value as a function of rotation characteristics of a respective wheel of the front and rear wheels, the at least one detection quantity being indicative of an alternation of the at least one wheel rotational speed signal between the first signal value and the second signal value, wherein the at least one detection quantity is evaluated in at least one of:
• the first arrangement to detect the standstill, and
• the second arrangement to detect the rollback;
• wherein at least one of:
• the standstill occurs if the velocity quantity is equal to or less than a first predefinable comparison value, and if the at least one detection quantity of the front wheels indicates that no alternation between the first signal value and the second signal value is occurring, and
• the rollback occurs when the at least one detection quantity of the at least one front wheel indicates that no alternation between the first signal value and the second signal value is occurring for the at least one front wheel, and when the at least one detection quantity of one of the at least one rear wheel indicates that the alternation is occurring between the first signal value and the second signal value.

A device for preventing a rollback of a vehicle on an incline, the vehicle including a brake system, at least one front wheel and at least one rear wheel, the brake system being utilized for influencing a first braking pressure in a first wheel brake of the at least one rear wheel to distribute a braking action between the at least one front wheel and the at least one rear wheel, the braking action being distributed by actuating actuators assigned to the at least one rear wheel so that a differential is set between a second braking pressure in a second wheel brake of the at least one front wheel and the first braking pressure in the first wheel brake of the at least one rear wheel, the device comprising:

• a first arrangement determining whether the vehicle is at a standstill due to the braking action in which the differential between the first braking pressure and the second braking pressure has been set;
• a second arrangement determining whether the vehicle is rolling back from the standstill, and increasing the first braking pressure in the first wheel brake of the at least one rear wheel to inhibit the rollback of the vehicle if the rollback is detected;
• a sensor arrangement generating at least one wheel rotational speed signal which is associated with a rotation of the at least one front wheel and the at least one rear wheel, the sensor arrangement being assigned to the front and rear wheels;
• a third arrangement determining a velocity quantity as a function of the at least one wheel rotational speed signal, the velocity quantity being indicative of a velocity of the vehicle, the first arrangement evaluating the velocity quantity for detecting the standstill;
• and
• a fourth arrangement determining at least one detection quantity for the individual wheels as a function of the at least one wheel rotational speed signal, wherein the at least one wheel rotational speed signal alternates between a first signal value and a second signal value as a function of rotation characteristics of a respective wheel of the front and rear wheels, the at least one detection quantity being indicative of an alternation of the at least one wheel rotational speed signal between the first signal value and the second signal value, wherein the at least one detection quantity is evaluated in at least one of:
• the first arrangement to detect the standstill, and
• the second arrangement to detect the rollback;
• wherein the rollback occurs:
• when the at least one detection quantity of the at least one front wheel indicates that no alternation between the first signal value and the second signal value is occurring for the at least one front wheel, and
• when the at least one detection quantity of the at least one rear wheel indicates that the alternation is occurring between the first signal value and the second signal value for two of the at least one rear wheel.