Brake-by-wire brake system for motorcycle

Abstract

A brake system (4) for a motorcycle, comprising: a first brake device (12) operatively connectable to a first wheel of the motorcycle and provided with a first hydraulic supply circuit (16); a first manually operated hydraulic device (20) provided with a first manually operated control (24) and a first hydraulic delivery circuit (28) fluidly connectable to the first hydraulic supply circuit (16); a second brake device (32) operatively connectable to the first or second wheel of the motorcycle and provided with a second hydraulic supply circuit (36), which is different from or coincides with the first hydraulic supply circuit (16); a second manually operated hydraulic device (40) provided with a second manually operated control (44) and a second hydraulic delivery circuit (48) fluidly connectable to the second hydraulic supply circuit (36); the invention relates to a hydraulic system comprising a first hydraulic supply circuit (16) and a second hydraulic supply circuit (36), an electric actuator (52) having an electrically or electromechanical motor device (56) operatively connected to an electrically or electromechanically operated float (60), the electrically or electromechanically operated float (60) being fluidly connected to a conveyor (64) of the electric actuator (52), the conveyor (64) being connected to the first hydraulic supply circuit (16) and / or the second hydraulic supply circuit (36), the first hydraulic delivery circuit (28) and the second hydraulic delivery circuit (48) are fluidly connected to each other by placing a valve device (68), in which the brake system (4) is provided with a processing and control unit (72) operatively connected to the electric actuator (52) and to the valve device (68), the processing and control unit (72) is programmed such that: in a standard operation, the processing and control unit (72) translates the electrically or electromechanically operated float (60) in the event that the first manually operated hydraulic device (20) and / or the second manually operated hydraulic device (40) are / is actuated, and in the event that the first manually operated hydraulic device (20) and / or the second manually operated hydraulic device (40) are / is actuated, the processing and control unit (72) translates the electrically or electromechanically operated float (60); in order to fluidly disconnect the first hydraulic supply circuit (16) and / or the second hydraulic supply circuit (36) from the first hydraulic supply circuit (28) and / or the second hydraulic supply circuit (48), and at the same time to actuate at least the first brake device (12) and / or at least the second brake device (32).

Description

Technical Field

[0001] The invention also relates to a brake system of the brake-by-wire (BBW) type, in particular for a motorcycle. Background Art

[0002] In motorcycles, there are brake-by-wire type braking systems in which the user manually operates two separate manual controls, typically a lever and a pedal on the handlebars, to send a request for a braking action to the appropriate control unit.

[0003] This request for a braking action is switched to actuate one or more electric motors acting on friction elements (usually pads, but also shoes) of the brake device with which the motorcycle is equipped. Thus, under normal operating conditions, the user does not directly command the actuation of the brake device, but rather sends a braking request through the control unit, which is satisfied by the electric motors.

[0004] In the event of a malfunction, the system must allow hydraulic backup to ensure that the user can at least partially brake the motorcycle by acting directly on the manually operated means.

[0005] In the event of a failure of the E / E system (ECU, actuators, sensors, etc.) or in the absence of the electrical supply (battery disconnected) and requiring a partial fluidless brake system actuation (at least one caliper or full electromechanical axle DRY), prior art motorcycle solutions do not allow the hydraulic backup to be operated via two controls (lever and brake pedal). Finally, there is a need to provide a braking system compatible with electric vehicles (combined with regenerative braking, residual torque reduction). Summary of the invention

[0006] Therefore, the art needs to provide a braking system to solve the technical problems mentioned in the prior art.

[0007] The brake system according to claim 1 meets this need.

[0008] In particular, this need is met by a braking system for a motorcycle, the braking system comprising: a first braking device, the first braking device being operatively connected to a first wheel of the motorcycle and being provided with a first hydraulic supply circuit; a first manually operated hydraulic device, the first manually operated hydraulic device being provided with a first manually operated control and a first hydraulic delivery circuit fluidically connectable to the first hydraulic supply circuit; a second braking device, the second braking device being operatively connected to the first or second wheel of the motorcycle and being provided with a second hydraulic supply circuit, the second hydraulic supply circuit being different from the first hydraulic supply circuit or coinciding with the first hydraulic supply circuit; a second manually operated hydraulic device, the second manually operated hydraulic device being provided with a second manually operated control and a second hydraulic delivery circuit fluidically connected to the second hydraulic supply circuit; an electric actuator having an electric or electromechanical motor device, The motor device is operatively connected to an electrically or electromechanically operated floating member, which is fluidly connected to a conveyor of an electric actuator, which is connected to the first hydraulic supply circuit and / or the second hydraulic supply circuit, wherein the first hydraulic delivery circuit and the second hydraulic delivery circuit are fluidly connected to each other by inserting a valve device, wherein the braking system is provided with a processing and control unit, which is operatively connected to the electric actuator and the valve device, and the processing and control unit is programmed so that: in standard operation, when the first manually operated hydraulic device and / or the second manually operated hydraulic device is activated, the processing and control unit causes the electrically or electromechanically operated floating member to translate so as to fluidly disconnect the first hydraulic supply circuit and / or the second hydraulic supply circuit from the first hydraulic delivery circuit and / or the second hydraulic delivery circuit, and simultaneously activate at least the first braking device and / or at least the second braking device.

[0009] According to a possible embodiment of the present invention, the processing and control unit is programmed so that: in the backup operation, the processing and control unit supports or allows the backup of the electrically or electromechanically operated floating member so as to allow the fluid connection between the first hydraulic supply circuit and / or the second hydraulic supply circuit and the first hydraulic delivery circuit and / or the second hydraulic delivery circuit and to simultaneously actuate at least the first braking device and / or at least the second braking device when at least one of the first manually operated hydraulic device and the second manually operated hydraulic device is operated.

[0010] According to a possible embodiment of the present invention, the valve device includes a diverter valve, which has: a first inlet port fluidly connected to the first hydraulic delivery circuit; a second inlet port fluidly connected to the second hydraulic delivery circuit; and a single outlet port, which is fluidly connected to the hydraulic delivery circuit with a higher pressure between the first hydraulic delivery circuit and the second hydraulic delivery circuit.

[0011] According to a possible embodiment of the present invention, the first hydraulic delivery circuit is provided with at least one control valve, the control valve of the first hydraulic delivery circuit connects the first hydraulic delivery circuit to the first hydraulic brake simulator in standard operation, and connects the first hydraulic delivery circuit to the first inlet port of the diverter valve in standby operation, and / or the second hydraulic delivery circuit is provided with at least one control valve, the control valve of the second hydraulic delivery circuit connects the second hydraulic delivery circuit to the second hydraulic brake simulator in standard operation, and connects the second hydraulic delivery circuit to the second inlet port of the diverter valve in standby operation.

[0012] According to a possible embodiment of the invention, the first manually operated device is provided with a first hydraulic fluid tank having a preload membrane which ensures overpressure to compensate for the different metrological heights relative to a second hydraulic fluid tank of the second manually operated device.

[0013] According to a possible embodiment of the present invention, the valve device includes a slide valve, which is controlled by the processing and control unit so that: under standard conditions, the slide valve fluidically separates the first hydraulic delivery circuit, the second hydraulic delivery circuit and the conveyor of the electric actuator from each other, wherein the conveyor supplies the first hydraulic supply circuit and the second hydraulic supply circuit; in the standby mode, the slide valve connects the first hydraulic delivery circuit with the first hydraulic supply circuit, and connects the second hydraulic delivery circuit with the second hydraulic supply circuit, and wherein the slide valve hydraulically separates the first hydraulic supply circuit and the second hydraulic supply circuit.

[0014] According to a possible embodiment of the present invention, the system includes a main hydraulic fluid tank, which supplies a first tank of a first manually-operated hydraulic device and a second tank of a second manually-operated hydraulic device, wherein the main tank is preloaded, and wherein the preload does not generate a pressure that causes the braking device to be activated, wherein the valve device includes a sliding valve, which selectively connects or disconnects the first hydraulic delivery circuit and the second hydraulic delivery circuit to the first hydraulic supply circuit and the second hydraulic supply circuit, respectively.

[0015] According to a possible embodiment of the present invention, the system includes a first hydraulic brake simulator connected to a first hydraulic delivery circuit and a second hydraulic brake simulator connected to a second hydraulic delivery circuit, each of the hydraulic brake simulators being equipped with a single hydraulic tank, wherein the valve device 68 includes a sliding valve that selectively connects or disconnects the first hydraulic delivery circuit and the second hydraulic delivery circuit with the first supply circuit and the second supply circuit, respectively.

[0016] According to a possible implementation manner of the present invention, the slide valve is divided into four two-way valves, preferably, the four two-way valves are two normally closed valves and two normally open valves.

[0017] According to a possible embodiment of the invention, the system comprises a single brake fluid tank supplying the first and second hydraulic delivery circuits upstream of the valve device, the single tank being preloaded under pressure.

[0018] According to a possible embodiment of the invention, the first hydraulic supply circuit and the second hydraulic supply circuit are fluidly connected to two brake devices arranged at the front of the vehicle.

[0019] According to a possible embodiment of the invention, the first hydraulic supply circuit and the second hydraulic supply circuit coincide and are fluidically connected to a single braking device at the rear of the vehicle.

[0020] According to a possible embodiment of the present invention, the first manually-operated hydraulic device and the second manually-operated hydraulic device are arranged in series with each other and in series with the first hydraulic supply circuit and the second hydraulic supply circuit, wherein each manually-operated hydraulic device comprises a piston provided with a one-way lip seal at the outlet of the device itself.

[0021] According to a possible embodiment of the invention, the system comprises a brake fluid tank which is directly connected upstream of the electric actuator by means of a plurality of non-return valves connected in series, which allow leakage of the fluid when the system is at atmospheric pressure and at the same time prevent the passage of the fluid in the opposite direction during actuation of the braking device in standard and standby operation.

[0022] According to a possible embodiment of the present invention, the valve device includes two normally closed hydraulic valves and two normally open hydraulic valves that fluidly connect two manually operated hydraulic devices to allow a pressure channel between the manually operated hydraulic devices and the hydraulic supply circuit and prevent the spare absorption member connected to the manually operated hydraulic devices from absorbing the volume.

[0023] According to a possible implementation manner of the present invention, the braking device includes a disc brake and / or a drum brake.

[0024] The invention also relates to a motorcycle comprising a braking system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further characteristics and advantages of the invention will become more readily apparent from the following description of a preferred embodiment given by way of non-limiting example, in the accompanying drawings:

[0026] Figures 1 to 8 Schematic diagram of a brake system according to various embodiments of the present invention.

[0027] Elements or parts of elements common to the embodiments described below will be denoted by the same reference numerals. DETAILED DESCRIPTION

[0028] With reference to the above-mentioned figures, reference numeral 4 generally designates a braking system of a vehicle, in particular a braking system for a motorcycle 8 .

[0029] The brake system 4 for the motorcycle 8 comprises a first brake device 12 which is operatively connectable to a first wheel (not shown) of the motorcycle 8 and is provided with a first hydraulic supply circuit 16. Typically, the first brake device 12 may comprise a disc brake or a drum brake.

[0030] The brake system 4 firstly comprises a manually operated hydraulic device 20 which is provided with a first manually operated control element 24 , such as, for example, a joystick or a pedal, and a first hydraulic delivery circuit 28 which is fluidically connectable to the first hydraulic supply circuit 16 .

[0031] The brake system 4 further comprises a second brake device 32 operatively connected to the first or second wheel (not shown) of the motorcycle 8 and provided with a second hydraulic supply circuit 36 ​​different from or overlapping with the first hydraulic supply circuit 16 .

[0032] Generally, the second brake device 12 may include a disc brake or a drum brake. The second hydraulic supply circuit 36 ​​may be physically different from the first hydraulic supply circuit 16 , but the second hydraulic supply circuit 36 ​​may also converge into the first hydraulic supply circuit 16 to overlap with the first hydraulic supply circuit 16 .

[0033] The brake system 8 comprises a second manually operated hydraulic device 40 provided with a second manually operated control 44 , typically a joystick or a pedal, and a second hydraulic delivery circuit 48 fluidly connectable to the second hydraulic supply circuit 36 ​​.

[0034] The braking system 8 also includes an electric actuator 52, which has an electric or electromechanical motor device 56, which is operatively connected to an electrically or electromechanically operated floating member 60, and the floating electrically or electromechanically operated moving member 60 is fluidly connected to a conveyor 64 of the electric actuator 52, and the conveyor 64 is fluidly connected to the first hydraulic supply circuit 16 and / or the second hydraulic supply circuit 36.

[0035] Typically, the feeder 64 is a hydraulic fluid conduit that fluidly converges into the first hydraulic supply circuit 16 and / or the second hydraulic supply circuit 36 ​​.

[0036] Advantageously, the first hydraulic feed circuit 28 and the second hydraulic feed circuit 48 are fluidically connected to one another by means of an interposed valve arrangement 68 , as will be better described below.

[0037] The braking system 8 is provided with a processing and control unit 72, which is operatively connected to the electric actuator 52 and the valve device 68, and is programmed so that: in standard operation, when the first manually operated hydraulic device 20 and / or the second manually operated hydraulic device 40 (which the user utilizes to request braking action from the system 8) are actuated, the processing and control unit 72 causes the electrically or electromechanically operated floating member 60 to translate so as to fluidically disconnect the first hydraulic supply circuit 16 and / or the second hydraulic supply circuit 36 ​​from the first hydraulic delivery circuit 28 and / or the second hydraulic delivery circuit 48, and simultaneously actuate at least the first braking device 12 and / or at least the second braking device 32.

[0038] According to an embodiment, the processing and control unit 72 is programmed so that: in a backup operation, the processing and control unit 72 supports or allows the backup of the electrically or electromechanically operated floating member 60 so as to allow fluid connection between the first hydraulic supply circuit 16 and / or the second hydraulic supply circuit 38 and the first hydraulic delivery circuit 28 and / or the second hydraulic delivery circuit 48 and simultaneously actuate at least the first braking device 12 and / or at least the second braking device 32 when at least one of the first manually operated hydraulic device 20 and the second manually operated hydraulic device 40 is actuated.

[0039] According to possible implementations ( Figure 1 to Figure 2 ), the valve device 68 includes a diverter valve 76, which has: a first inlet port 80 fluidly connected to the first hydraulic delivery circuit 28; a second inlet port 82 fluidly connected to the second hydraulic delivery circuit 48; and a single outlet port 84, the single outlet port 84 is connected to the hydraulic delivery circuit fluid with a higher pressure between the first hydraulic delivery circuit 28 and the second hydraulic delivery circuit 48.

[0040] Thus, braking may be performed using a manually operated joystick or pedal control to deliver the greatest pressure in terms of actuation pressure, ie, the maximum pressure applied by the user (whether pedal or joystick) prevails.

[0041] According to a possible embodiment of the present invention ( Figure 1 to Figure 2), the first hydraulic delivery circuit 28 is provided with at least one control valve 88, the control valve 88 of the first hydraulic delivery circuit 28 is of NO (normally open) type or NC (normally closed) type, the control valve of the first hydraulic delivery circuit 28 connects the first hydraulic delivery circuit 28 to the first hydraulic brake simulator 92 in standard operation, and connects the first hydraulic delivery circuit 28 to the first inlet port 80 of the diverter valve 76 in standby operation, and / or wherein the second hydraulic delivery circuit 48 is provided with at least one control valve 88 (NO type or NC type), the control valve 88 of the second hydraulic delivery circuit 48 connects the second hydraulic delivery circuit 48 to the second hydraulic brake simulator 96 in standard operation, and connects the second hydraulic delivery circuit 48 to the second inlet port 82 of the diverter valve 76 in standby operation.

[0042] According to a possible embodiment of the present invention ( Figure 1 to Figure 2 ), the first manually operated device 20 is provided with a first hydraulic fluid tank 100 having a preloaded membrane which ensures overpressure to compensate for the different metrological heights with respect to the second hydraulic fluid tank 104 of the second manually operated device 40. This solves the problem of emptying the tank which is usually placed at a higher altitude in a motorcycle, that is, the tank connected to the handlebars, than the tank connected to the pedals.

[0043] According to possible implementations ( Figure 3 to Figure 4 ), the valve device 68 includes a slide valve 108, which is controlled by the processing and control unit 72 so that: under standard operating conditions, the slide valve 108 fluidly separates the first hydraulic delivery circuit 28, the second hydraulic delivery circuit 48 and the conveyor 64 of the electric actuator 52 from each other, wherein the conveyor 64 supplies the first hydraulic supply circuit 16 and the second hydraulic supply circuit 36.

[0044] Furthermore, in the standby mode, the spool valve 108 connects the first hydraulic delivery circuit 28 with the first hydraulic supply circuit 16 (e.g., to control a first caliper mounted to the front wheel of the motorcycle), and connects the second hydraulic delivery circuit 48 with the second hydraulic supply circuit 36 ​​(e.g., to control a second caliper mounted to the same front wheel of the motorcycle), and wherein the spool valve 108 hydraulically separates the first hydraulic supply circuit 16 from the second hydraulic supply circuit 36. With this hydraulic separation, the hydraulic circuits of the two manual controls of the rider are independent of each other, thereby preventing the action of one control from affecting the characteristics of the other control.

[0045] According to possible implementations ( Figure 3), the system 4 comprises a main hydraulic fluid tank 112, which supplies the first tank 100 of the first manually operated hydraulic device 20 and the second tank 104 of the second manually operated hydraulic device 40, wherein the main tank 112 is preloaded. The first tank 100 and the second tank 104 cannot be empty due to the corresponding metrological height difference. Preferably, the preload, the preload obtained by means of the membrane biased by the spring 113, does not generate a pressure that causes the actuation of the braking device 12, 32. Preferably, the valve device 68 comprises a slide valve 108, which selectively connects or disconnects the first hydraulic delivery circuit 28 and the second hydraulic delivery circuit 48 to the first hydraulic supply circuit 16 and the second hydraulic supply circuit 36, respectively.

[0046] According to possible implementations ( Figure 4 ), the brake system 4 comprises a first hydraulic brake simulator 92 connected to the first hydraulic delivery circuit 28 and a second hydraulic brake simulator 96 connected to the second hydraulic delivery circuit 48, each of the hydraulic brake simulators 92, 96 being provided with a single hydraulic tank. Preferably, the valve device 68 comprises a slide valve 108, which selectively connects or disconnects the first hydraulic delivery circuit 28 and the second hydraulic delivery circuit 48 to the first supply circuit 16 and the second supply circuit 36, respectively. Therefore, the free fluid bed is above everything else in the hydraulic circuit, so no preload is required to avoid emptying of the different tanks. Moreover, in this configuration, no check valve is required either, since the tanks are placed upstream of all pumps.

[0047] According to possible implementations ( Figure 5 ), the slide valve 108 is divided into four two-way valves 116. Preferably, the four two-way valves 116 are two normally closed (NC) valves and two normally open (NO) valves.

[0048] According to possible implementations ( Figure 6 ), the system 4 comprises a single brake fluid tank 112, which supplies the first hydraulic delivery circuit 28 and the second hydraulic delivery circuit 48 upstream of the valve device 68, and the single tank 112 is preloaded and is under pressure (to ensure that in standard mode and backup mode, due to thermal expansion and pad wear, manual control is fully satisfied by the joystick or pedal.

[0049] The absence of a separate tank on each manually operated hydraulic device 20, 40 allows both functions. In standby operation, this allows pressure to be generated, for example by a pedal, and also allows pressurization of idle manually operated lever controls, which is not possible with tanks at atmospheric pressure. Furthermore, the manually operated controls, in particular the brake levers, are aesthetically particularly small, making the style of these components particularly innovative and unique.

[0050] For example( Figure 6 ), the first hydraulic supply circuit 16 and the second hydraulic supply circuit 36 ​​are fluidly connected to two braking devices 12, 32 arranged at the front of the vehicle.

[0051] There may also be an implementation method ( Figure 7 ), wherein the first hydraulic supply circuit and the second hydraulic supply circuit are coincident and fluidly connected to a single braking device arranged at the rear wheel of the motorcycle.

[0052] According to another possible embodiment ( Figure 8 ), the first manually operated hydraulic device 20 and the second manually operated hydraulic device 40 are arranged in series with each other and with the first hydraulic supply circuit 16 and the second hydraulic supply circuit 36. Each manually operated hydraulic device 20, 40 comprises a piston provided with a one-way lip seal (not shown) at the outlet of the device. Thus, two manually operated controls 24, 44 can control a single caliper according to maximum logic.

[0053] For example, the braking system 4 includes a brake fluid tank, which is directly connected upstream of the electric actuator through a plurality of one-way valves 120 connected in series, which allow fluid leakage when the system is at atmospheric pressure and simultaneously prevent fluid from passing in the opposite direction during actuation of the braking device in standard operation and backup operation.

[0054] According to possible implementations ( Figure 8 ), the valve device 68 includes two normally closed hydraulic valves 70 and two normally open hydraulic valves 69 that fluidly connect the two manually operated hydraulic devices 20, 40 to allow pressure passages between the manually operated hydraulic devices 20, 40 and the hydraulic supply circuits 16, 36, and prevent the absorption members 92, 96 connected to the standby manually operated hydraulic devices from absorbing volume.

[0055] As can be appreciated from the above description, the present invention allows to overcome the drawbacks existing in the prior art.

[0056] In particular, in the event of a failure of the E / E system (ECU, actuators, sensors, etc.), or in the event of a lack of power supply (battery disconnected) and partial fluid-free brake system actuation (at least one caliper or fully electromechanical axle DRY), the braking system of the invention allows the hydraulic backup device to be actuated by means of two controls (lever and brake pedal).

[0057] Finally, the invention allows providing a braking system compatible with electric vehicles (mixed with regenerative braking, residual torque reduction).

[0058] In order to meet occasional and specific needs, those skilled in the art may make several modifications and variations to the above-mentioned braking system and motorcycle, and these modifications and variations are all included in the present invention as mechanical and / or functional equivalents.

[0059] The scope of protection of the present invention is defined by the appended claims.

Claims

1. A braking system (4) for a motorcycle, the braking system (4) comprising: a first braking device (12) operatively connectable to a first wheel of the motorcycle and provided with a first hydraulic supply circuit (16), a first manually operated hydraulic device (20) provided with a first manually operated control (24) and a first hydraulic delivery circuit (28) fluidically connectable to the first hydraulic supply circuit (16), a second braking device (32) operatively connectable to the first wheel or the second wheel of the motorcycle and provided with a second hydraulic supply circuit (36) which is different from or coincident with the first hydraulic supply circuit (16), - a second manually operated hydraulic device (40) provided with a second manually operated control (44) and a second hydraulic delivery circuit (48) fluidly connected to the second hydraulic supply circuit (36), an electric actuator (52) having an electric or electromechanical motor device (56) operatively connected to an electric or electromechanically operated float (60), the electric or electromechanically operated float (60) being fluidically connected to a conveyor (64) of the electric actuator (52), the conveyor (64) being connected to the first hydraulic supply circuit (16) and / or the second hydraulic supply circuit (36), wherein the first hydraulic supply circuit (28) and the second hydraulic supply circuit (48) are fluidically connected to one another by means of an interposed valve device (68), - wherein the braking system (4) is provided with a processing and control unit (72) operatively connected to the electric actuator (52) and the valve device (68), the processing and control unit (72) being programmed such that: - In standard operation, when the first manually operated hydraulic device (20) and / or the second manually operated hydraulic device (40) are in operation, the processing and control unit (72) causes the electrically or electromechanically operated floating member (60) to translate, thereby fluidically disconnecting the first hydraulic supply circuit (16) and / or the second hydraulic supply circuit (36) from the first hydraulic delivery circuit (28) and / or the second hydraulic delivery circuit (48), and simultaneously causing at least the first braking device (12) and / or at least the second braking device (32) to operate.

2. The brake system (4) according to claim 1, wherein: The processing and control unit (72) is programmed so that: In a backup operation, the processing and control unit (72) supports or allows the backup of the electrically or electromechanically operated floating member (60), so that: when at least one of the first manually operated hydraulic device (20) and the second manually operated hydraulic device (40) is operated, the fluid connection between the first hydraulic supply circuit (16) and / or the second hydraulic supply circuit (36) and the first hydraulic delivery circuit (28) and / or the second hydraulic delivery circuit (48) is allowed, and at the same time, at least the first braking device (12) and / or at least the second braking device (32) is operated.

3. The braking system (4) for a motorcycle according to claim 1, wherein: The valve device (68) includes a diverter valve (76) having: a first inlet port (80) fluidly connected to the first hydraulic delivery circuit (48); a second inlet port (82) fluidly connected to the second hydraulic delivery circuit (48); and a single outlet port (84) fluidly connected to the hydraulic delivery circuit having a higher pressure between the first hydraulic delivery circuit (28) and the second hydraulic delivery circuit (48).

4. A braking system (4) for a motorcycle according to claim 1, 2 or 3, wherein: The first hydraulic supply circuit (28) is provided with at least one control valve (88), in standard operation, the control valve (88) of the first hydraulic supply circuit connects the first hydraulic supply circuit (28) to a first hydraulic brake simulator (92), and in standby operation, the control valve (88) of the first hydraulic supply circuit connects the first hydraulic supply circuit (28) to the first inlet port (80) of the diverter valve (76), and / or wherein, The second hydraulic supply circuit (48) is provided with at least one control valve (88), in standard operation, the control valve (88) of the second hydraulic supply circuit connects the second hydraulic supply circuit (48) to the second hydraulic brake simulator (96), and in standby operation, the control valve (88) of the second hydraulic supply circuit connects the second hydraulic supply circuit (48) to the second inlet port (82) of the diverter valve (76).

5. A braking system (4) for a motorcycle according to any one of claims 1 to 4, wherein: The first manually operated device (20) is provided with a first hydraulic fluid tank (100) having a preloaded membrane which ensures overpressure to compensate for the different metrological heights with respect to a second hydraulic fluid tank (104) of the second manually operated device (40).

6. The braking system (4) for a motorcycle according to claim 1 or 2, wherein: The valve device (68) comprises a slide valve (108) which is controlled by the processing and control unit (72) such that: In a standard situation, the slide valve (108) fluidically separates the first hydraulic supply circuit (28), the second hydraulic supply circuit (48) and a conveyor (64) of the electric actuator (52) from one another, wherein the conveyor (64) supplies the first hydraulic supply circuit (16) and the second hydraulic supply circuit (36). In a standby mode, the spool valve (76) connects the first hydraulic delivery circuit (28) with the first hydraulic supply circuit (16) and connects the second hydraulic delivery circuit (48) with the second hydraulic supply circuit (36), and wherein the spool valve (76) hydraulically decouples the first hydraulic supply circuit (16) and the second hydraulic supply circuit (36).

7. The brake system (4) for a motorcycle according to claim 6, wherein: The system (4) includes a main hydraulic fluid tank (112) which supplies a first tank (100) of the first manually operated hydraulic device (20) and a second tank (104) of the second manually operated hydraulic device (40), wherein the main tank (112) is preloaded and wherein the preload does not generate a pressure that determines the operation of the brake devices (12, 32), wherein the valve device (68) includes a spool valve (76) which selectively connects or disconnects the first hydraulic delivery circuit (28) and the second hydraulic delivery circuit (48) to the first hydraulic supply circuit (16) and the second hydraulic supply circuit (36), respectively.

8. The brake system (4) for a motorcycle according to claim 6, wherein: The system (4) includes a first hydraulic brake simulator (92) connected to the first hydraulic delivery circuit (28) and a second hydraulic brake simulator (96) connected to the second hydraulic delivery circuit (48), each of the hydraulic brake simulators (92, 96) being provided with a single hydraulic tank (100, 104), wherein the valve device (68) includes a slide valve (76), the slide valve (76) selectively connecting or disconnecting the first hydraulic delivery circuit (28) and the second hydraulic delivery circuit (48) to the first supply circuit (16) and the second supply circuit (36), respectively.

9. A braking system (4) for a motorcycle according to claim 6, 7 or 8, wherein: The slide valve (76) is divided into four two-way valves (116). Preferably, the slide valve (76) is divided into two normally closed valves and two normally open valves.

10. The brake system (4) for a motorcycle according to claim 1 or 2, wherein: The system (4) comprises a single brake fluid tank (112) supplying the first hydraulic delivery circuit (28) and the second hydraulic delivery circuit (48) upstream of the valve device (68), the single tank (112) being preloaded under pressure.

11. The brake system (4) for a motorcycle according to claim 10, wherein: The first hydraulic supply circuit (16) and the second hydraulic supply circuit (36) are fluidly connected to two brake devices (12, 32) arranged at the front of the vehicle.

12. The brake system (4) for a motorcycle according to claim 1 or 2, wherein: The first hydraulic supply circuit (16) and the second hydraulic supply circuit (36) are coincident and fluidly connected to a single brake device at the rear of the vehicle.

13. The brake system (4) for a motorcycle according to claim 1 or 2, wherein: The first manually operated hydraulic device (20) and the second manually operated hydraulic device (40) are arranged in series with each other and with the first hydraulic supply circuit (16) and the second hydraulic supply circuit (36), wherein each manually operated hydraulic device (20, 40) comprises a piston provided with a one-way lip seal at its outlet.

14. The brake system (4) for a motorcycle according to claim 13, wherein: The system includes a brake fluid tank (112) which is directly connected upstream of the electric actuator through a plurality of one-way valves (120) connected in series, the one-way valves (120) allowing fluid to leak out when the system is at atmospheric pressure and simultaneously preventing fluid from passing in the opposite direction during operation of the brake device (12, 32) in standard and standby operations.

15. The brake system (4) for a motorcycle according to claim 13 or 14, wherein: The valve device (68) includes two normally closed hydraulic valves (70) and two normally open hydraulic valves (69) fluidly connecting the two manually operated hydraulic devices (20, 40) to allow pressure passage between the manually operated hydraulic devices (20, 40) and the hydraulic supply circuit (16, 36) and prevent standby absorbers (92, 96) connected to the manually operated hydraulic devices from absorbing volume.

16. A braking system (4) for a motorcycle according to any one of claims 1 to 15, wherein: The braking device (12, 32) comprises a disc brake and / or a drum brake.

17. A motorcycle (8) comprising a braking system (4) according to any one of claims 1 to 16.

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