Vehicle brake pressure controller

1. A vehicle brake pressure controller comprising:

a running environment recognizing unit mounted on a vehicle and recognizing a running environment ahead the vehicle;

a brake driving unit supplying a brake fluid pressure to a brake provided in the vehicle and pressing a friction member against a rotating member rotating together with an axle of the brake; and

a brake controlling unit determining the brake fluid pressure supplied to the brake from the brake driving unit, wherein the brake controlling unit includes:

a brake actuation object detecting unit detecting a brake actuation object based on the running environment recognized by the running environment recognizing unit;

a target brake pre-pressure actuation distance setting unit determining a target brake pre-pressure actuation distance based on a relative speed between the brake actuation object and the vehicle when the brake actuation object detecting unit detects a brake actuation object, wherein the target brake pre-pressure actuation distance setting unit determines the target brake pre-pressure actuation distance by correcting a basic brake pre-pressure actuation distance using a learning correction factor, the basic brake pre-pressure actuation distance being determined based on the relative speed between the brake actuation object and the vehicle, the learning correction factor being set based on a vehicle speed of the vehicle;

a brake detecting unit detecting pressing of a brake pedal, wherein the brake controlling unit includes a brake pre-pressure learning correction factor updating unit to update the learning correction factor according to a difference between the target brake pre-pressure actuation distance and the distance to the brake actuation object, the brake actuation object being detected by the running environment recognizing unit when the brake detector detects the pressing of the brake pedal; and

a brake pre-pressure outputting unit to output a driving signal to the brake driving unit before an operation of a brake pedal is performed when a distance between the vehicle and the brake actuation object reaches the target brake pre-pressure actuation distance, the driving signal generating brake pre-pressure to bring the friction member into slight contact with or close to the rotating member.

2. The vehicle brake pressure controller according to claim 1 , further comprising an accelerator opening degree detecting unit to detect an opening degree of an accelerator pedal,

wherein, when the pressing of an accelerator pedal is detected based on the opening degree of the accelerator pedal detected by the accelerator opening degree detector, the brake pre-pressure outputting unit does not output the driving signal generating the brake pre-pressure to the brake driving unit, even if the distance between the vehicle and the brake actuation object reaches the target brake pressurization actuation distance.

3. The vehicle brake pressure controller according to claim 1 , wherein the brake controlling unit includes a brake pre-pressure release controlling unit to output, to the brake driving unit, a signal that releases the brake pre-pressure after a setting delay time elapses, when the brake pre-pressure outputting unit outputs the driving signal generating the brake pre-pressure and the brake detecting unit detects the release of the brake pedal after detecting the pressing of the brake pedal.

4. The vehicle brake pressure controller according to claim 2 , wherein the brake controlling unit includes a brake pre-pressure release controlling unit to output, to the brake driving unit, a signal that releases the brake pre-pressure after a setting delay time elapses, when the brake pre-pressure outputting unit outputs the driving signal generating the brake pre-pressure and the brake detecting unit detects the release of the brake pedal after detecting the pressing of the brake pedal.

5. The vehicle brake pressure controller according to claim 3 , wherein the brake pre-pressure release controlling unit clears the setting delay time when the brake detector detects the pressing of the brake pedal within the setting delay time.

6. The vehicle brake pressure controller according to claim 4 , wherein the brake pre-pressure release controlling unit clears the setting delay time when the brake detector detects the pressing of the brake pedal within the setting delay time.

7. The vehicle brake pressure controller claim 3 , wherein the brake pre-pressure release controlling unit outputs a signal to release the brake pre-pressure to the brake driving unit when the accelerator opening degree detecting unit detects the pressing of the accelerator pedal within the setting delay time.

8. The vehicle brake pressure controller claim 4 , wherein the brake pre-pressure release controlling unit outputs a signal to release the brake pre-pressure to the brake driving unit when the accelerator opening degree detecting unit detects the pressing of the accelerator pedal within the setting delay time.

9. The vehicle brake pressure controller claim 5 , wherein the brake pre-pressure release controlling unit outputs a signal to release the brake pre-pressure to the brake driving unit when the accelerator opening degree detecting unit detects the pressing of the accelerator pedal within the setting delay time.

10. The vehicle brake pressure controller claim 6 , wherein the brake pre-pressure release controlling unit outputs a signal to release the brake pre-pressure to the brake driving unit when the accelerator opening degree detecting unit detects the pressing of the accelerator pedal within the setting delay time.

11. A vehicle brake pressure controller comprising:

a running environment recognizing unit mounted on a vehicle and configured to recognize a running environment ahead the vehicle;

a brake driving unit to supply a brake fluid pressure to a brake provided in the vehicle and press a friction member against a rotating member rotating together with an axle of the brake; and

a controller including a processor and a non-transitory memory storing a control program, wherein:

the control program, when executed by the processor, causes the controller to:

detect a brake actuation object based on the running environment recognized by the running environment recognizing unit;

determine a target brake pre-pressure actuation distance based on a relative speed between the brake actuation object and the vehicle when a brake actuation object is detected;

determine the target brake pre-pressure actuation distance by correcting a basic brake pre-pressure actuation distance using a learning correction factor, the basic brake pre-pressure actuation distance being determined based on the relative speed between the brake actuation object and the vehicle, the learning correction factor being set based on a vehicle speed of the vehicle;

detect pressing of a brake pedal;

update the learning correction factor according to a difference between the target brake pre-pressure actuation distance and the distance to the brake actuation object, the brake actuation object being detected when the pressing of the brake pedal is detected; and

output a driving signal to the brake driving unit before an operation of a brake pedal is performed, when a distance between the vehicle and the brake actuation object reaches the target brake pre-pressure actuation distance, the driving signal generating brake pre-pressure to bring the friction member into slight contact with or close to the rotating member.

12. The vehicle brake pressure controller according to claim 11 , wherein the control program, when executed by the processor, further causes the controller to:

detect an opening degree of an accelerator pedal, and

when the pressing of an accelerator pedal is detected based on the opening degree of the accelerator pedal, not output the driving signal generating the brake pre-pressure to the brake driving unit, even if the distance between the vehicle and the brake actuation object reaches the target brake pressurization actuation distance.

13. The vehicle brake pressure controller according to claim 11 , wherein the control program, when executed by the processor, further causes the controller to:

output, to the brake driving unit, a signal that releases the brake pre-pressure after a setting delay time elapses, when the driving signal generating the brake pre-pressure is output and the release of the brake pedal is detected after detecting the pressing of the brake pedal.

14. The vehicle brake pressure controller according to claim 13 , wherein the control program, when executed by the processor, further causes the controller to:

clear the setting delay time when the pressing of the brake pedal is detected within the setting delay time.

15. The vehicle brake pressure controller claim 13 , wherein the control program, when executed by the processor, further causes the controller to:

output a signal to release the brake pre-pressure to the brake driving unit when the pressing of the accelerator pedal is detected within the setting delay time.