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1. WO2020202084 - BRAKE-BY-WIRE BRAKING SYSTEM FOR VEHICLES, PROVIDED WITH ELECTRIC ACTUATION AND ELECTRIC BACK-UP

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[ EN ]

CLAIMS

1. Braking system for vehicles (4) comprising

- a first brake group (8), a second brake group (12) and a third brake group (16),

- each brake group (8, 12, 16) comprising a rotor (20), a braking device (24) associated with said rotor (20), and an electro-hydraulic or electromechanical actuator (28) of each braking device (24),

- a first and a second control unit (32,36) for said brake groups (8,12,16),

- wherein the first control unit (32) is operatively connected to the first brake group (8) by means of a piloting device (40) for said electromechanical or electro-hydraulic actuator (28) of the first brake group (8) ,

- wherein the second control unit (36) is operatively connected to the second brake group (12) by means of a piloting device (40) for said electromechanical or electro-hydraulic actuator (28) of the second brake group (12), and is connected to the third brake group (16) by means of a piloting device (40) for the electromechanical or electro-hydraulic actuator (28) of the third brake group (16),

wherein the first control unit (32) is connected to and powered by a first power source (44), and wherein the second control unit (36) is connected to and powered by a second power source (48), said first and second power sources (44,48) being independent and galvanically isolated from each other,

- each control unit (32,36) being programmed to implement, via the corresponding piloting system (40), a standard braking strategy in case of malfunctions for each brake group (8, 12, 16) and a fault braking strategy, if it detects an electrical fault of one or more of the brake groups (8, 12, 16) .

2. The vehicle braking system (4) according to claim 1, wherein the first control unit (32) is also operatively connected to the third brake group (16) by a piloting device (40) for the electromechanical or electro-hydraulic actuator (28) of the third brake group (16) .

3. The vehicle braking system (4) according to claim 2, wherein the electromechanical or electro-hydraulic actuator (28) comprise a 6-phase electric motor (52) which pilots said third brake group (16), wherein the first and second control units (32,36) are connected to a piloting device (40) operatively connected to said 6-phase electric motor (52) .

4. The vehicle braking system (4) according to claim 1, wherein the first control unit (32) is operatively connected to the first brake group (8), the second brake group (12) and the third brake group (16) by means of three relative piloting devices (40),

wherein the second control unit (36) is operatively connected to the first brake group (8), the second brake group (12) and the third brake group (16) by means of three relative piloting devices (40), said piloting devices (40) being independent of each other.

5. The vehicle braking system (4) according to claim 4, wherein each brake group (8,12,16) is piloted by a 6-phase electric motor (52) connected to pairs of piloting devices (40), each piloting device (40) of said pairs being controlled by a relative control unit (32,36) .

6. The vehicle braking system (4) according to any one of the preceding claims, wherein the system (4) comprises a first and a second manual actuation device (60,64) for a request for a braking action by a user, wherein both the manual actuation devices (60,64) are provided with two actuation sensors (68,72), a first actuation sensor (68) being connected to the first control unit (32) and a second actuation sensor (72) being connected to the second control unit (36) .

7. The vehicle braking system (4) according to any one of the preceding claims, wherein each control unit (32,36) is connected to said first and second power sources (44,48) so that it can be alternately powered by each of said power sources (44,48) in the event of a fault of one of them.

8. The vehicle braking system (4) according to claim 7, wherein an additional control unit (56) or a dedicated electrical circuit programmed to manage the power supply of each control unit (32,36) is provided.

9. Braking system for vehicles (4) according to any one of the preceding claims, wherein each piloting device (40) is programmed to switch from a first switch position, corresponding to the standard braking strategy, to a second switch position corresponding to the fault braking strategy.

10. Braking system for vehicles (4) according to any of the preceding claims, wherein the first and the second control units (32, 36) are operatively connected to each other so that each knows the type of operation, standard or fault, implemented by the other control unit (36, 32) .

11. Braking system for vehicles (4) according to any of the preceding claims, wherein each electromechanical or electro-hydraulic actuator (28) is equipped with an operating sensor (76) suitable to monitor the operating condition of the relative electromechanical or electro-hydraulic actuator (28) and/or of the relative braking device (24) and to send the corresponding control unit (32, 36) an indication of standard or fault operation. 12. Braking system for vehicles (4) according to any one of the claims from 1 to 11, wherein the control units

(32,36) are programmed so that in case of fault of one brake group (8, 12, 16), the actuation of the remaining brake groups is ensured and coordinated (8, 12, 16) .

13. The vehicle braking system (4) according to any one of the claims from 1 to 12, wherein the control units

(32,36) are programmed so that in the event of a fault of one brake group (8,2,16) the actuation of the remaining brake units (8,12,16) is guaranteed, and wherein the braking system (4) is operatively connected to a piloting device of the vehicle, so as to coordinate the actuation of the piloting device with the actuation of the operating brake units (8,12,16) .

14. The vehicle braking system (4) according to any one of claims 1 to 13, wherein the control units (32,36) are programmed so that in the event of a fault of a brake group (8,12,16), the actuation of the remaining brake groups (8,12,16) is ensured and coordinated, wherein the braking system (4) is operatively connected to electricity generating means operatively connected to the brake groups (8,12,16) so as to obtain an additional braking action of the vehicle.

15. Braking system for vehicles (4) according to any of the claims from 9 to 12, wherein each electromechanical or electro-hydraulic actuator (28) is equipped with two operating sensors (76), each suitable to monitor the operating condition of the relative electromechanical or electro-hydraulic actuator (28) and/or of the relative braking device (24) and to send an indication of standard or fault operation to both the control units (32,36) .

16. Braking system for vehicles (4) according to any of the preceding claims, wherein the system (4) is managed by a control unit of the vehicle which manages vehicle dynamics and is able to perform guidance and an independent braking action of the same.

17. The vehicle braking system (4) according to any one of the preceding claims, wherein at least two of said brake groups (8,12) are associated with a first vehicle wheel and wherein the third brake group (16) is associated with a second vehicle wheel, distinct from the first wheel.

18. The vehicle braking system (4) according to any one of the claims from 1 to 16, wherein each of said first, second and third brake groups (8,12,16) is associated with a respective and distinct wheel of a vehicle.