Braking system including two batteries

Abstract

The invention relates to a braking system comprising: a braking device (2), first (3) and second (4) batteries for powering the braking device (5), switching means (K1, K2) between the batteries (3, 4) and the braking device (5), wherein the switching means (K1, K2) are controlled by first and second parameters respectively of the first (3) and second (4) batteries, such that, if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means (K1, K2) are configured in a state of connection of both batteries (3, 4) in series to the braking device (5), and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means (K1, K2) are configured in a state of connection of the second battery alone (4), respectively of the first battery (3) alone,to the braking device (5). Figure for the abbreviation: figure 2,

Description

Title of the invention: Braking system comprising two batteries

[0001] The invention relates to braking devices for vehicles requiring an electrical power supply, in particular electromechanical or electromagnetic braking devices. It also relates to electric parking or emergency braking devices.

[0002] An electromechanical vehicle braking system comprises an electromechanical braking device and a power supply including an electric battery to power the braking device. In an electromechanical braking device, the braking power depends on the electrical power supplied by the battery. It is therefore essential to provide sufficient power and ensure that electrical energy is available under all circumstances.

[0003] An electromechanical braking system is known in the prior art, comprising a second electric battery connected to the device in parallel with the first battery, as a safety measure, in order to power the braking system in the event of failure of the first battery. Logically, this second battery remains unused most of the time.

[0004] One drawback of this system is that the braking device's power is limited by the voltage supplied by a single battery. Therefore, to compensate for this voltage and transmit the necessary electrical power to the device, the current supplied must be significant, which implies electrical wiring with a large cross-section, making it expensive, heavy, and bulky.

[0005] The invention aims in particular to reduce the cross-section of the electrical power supply wiring of the braking device, at equal power, at least as long as no battery is faulty.

[0006] To this end, the invention relates to a braking system comprising:

[0007] - a braking device,

[0008] - the first and second batteries supplying electrical power to the braking device,

[0009] - means for switching between the batteries and the braking device,

[0010] in which the switching means are controlled by first and second parameters respectively of the first and second batteries, such that, if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means are configured in a state of connection of the two batteries in series to the braking device, and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means are configured in a state of connection of the second battery alone, respectively of the first battery alone, to the braking device.

[0011] Thus, when both batteries are operating normally, that is, when their respective parameters, typically voltage or internal resistance, are greater than or equal to the predetermined threshold, connecting the two batteries in series allows the braking system to receive the voltage generated by both batteries connected in series, rather than only the voltage generated by a single battery. This system therefore allows the braking system to receive equal power with reduced current, so that a smaller cross-section of electrical wiring can be used. Alternatively, using the same wiring, this system allows the power transmitted to the braking system to be increased without adding another battery.When one of the batteries is no longer functioning optimally, or even malfunctions—that is, when its parameter value falls below the threshold—the corresponding battery is isolated from the system and also from the other battery, in order to prevent a short circuit or one battery discharging into the other. The braking system remains powered by the normally functioning battery, thus ensuring braking safety.

[0012] The presence of the two batteries is therefore optimized since they are both used when they both operate normally, and one of the batteries can continue to power the device when the other is unavailable.

[0013] Other optional features follow, taken alone or in combination.

[0014] Advantageously, each parameter is a voltage across the terminals of the respective battery.

[0015] Thus, it is the voltage across each battery that controls the switching means. When the voltage across one battery is too low, it is isolated from the rest of the circuit, so that only the other battery powers the braking system. When both batteries are operating normally, their voltages are added together via the series connection to power the braking system.

[0016] Preferably, the switching means include at least one component forming a switch which changes state according to a voltage value across the component.

[0017] Thus, it is not necessary to add a control processing unit to control the component. The mode change is therefore autonomous, fast, and does not require any additional elements to the system.

[0018] Advantageously, the system includes a control unit obtaining the value of at least one of the battery parameters, preferably the parameter value of each battery, and controlling the switching means according to each value.

[0019] Thus, in this case, it is this unit that controls the switching means or some of the switching methods.

[0020] It is also possible to provide both certain switching means changing state autonomously and a control unit to control the other switching means.

[0021] Preferably, the switching means comprise at least one switching component selected from: a diode, a switching transistor, a dry contact or movable switch, and a relay.

[0022] Thus, these components are inexpensive and simple. Furthermore, they are controllable by the voltages across their respective terminals and can therefore be operated autonomously, without external control.

[0023] Advantageously, the switching means comprise a switch and a three-position switch,

[0024] - the switch having:

[0025] - a closing position of a bypass circuit of the second battery, of way to connect the first battery alone to the device when the three-position switch is in the open position;

[0026] - an open position,

[0027] - the three-position switch having:

[0028] - a closing position of a series connection circuit, so as to connect the two batteries in series to the device when the switch is in the open position;

[0029] - a closing position of a bypass circuit of the first battery, of way to connect the second battery alone to the device when the switch is in the open position;

[0030] - an open position.

[0031] Thus, by changing their position according to the respective parameter values ​​of the batteries, these components allow the batteries to be connected in series to the device or, conversely, allow only one battery to be connected to the device and the other battery to be isolated from the rest of the system. Three-position switches and switches are components that can be easily tested individually.

[0032] Preferably, the switching means comprise a switch and first and second diodes,

[0033] - the switch having:

[0034] - a closing position of a series connection circuit, so as to connect the two batteries in series to the device when the first and second diodes are blocking;

[0035] - an open position;

[0036] - the first diode being forward-biased when a voltage is applied across the terminals of the second battery is below the threshold, to form a bypass circuit for the second battery, so as to connect the first battery alone to the device;

[0037] - the second diode being forward-biased when a voltage across the terminals of the first battery is below the threshold, to form a bypass circuit from the first battery, so as to connect the second battery alone to the device.

[0038] Thus, when both batteries are operating normally, the switch is controlled to the closed position, and the battery parameters generate potential differences in the system such that the diodes, positioned for this purpose, allow current to flow only in series. However, as soon as one battery has a parameter value below the threshold, the switch is controlled to the open position, and the potential changes in the circuit are such that the diodes isolate the corresponding battery from the rest of the system, powering the device solely from the other battery. Diodes are less expensive components than switches.

[0039] Advantageously, the batteries are of the lead-acid or metal-ion type, for example lithium-ion or sodium-ion.

[0040] The invention also relates to a vehicle comprising a braking system as described above.

[0041] The invention also relates to a method for controlling switching means intended to organize the electrical connection between a braking device and the first and second power supply batteries of the braking device, the method comprising the following steps:

[0042] - obtaining the first and second parameters respectively of the first and second batteries,

[0043] - if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means are configured in a state of connection of the two batteries in series to the braking device, and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means are configured in a state of connection of the second battery alone, respectively of the first battery alone, to the braking device.

[0044] The invention also relates to a data processing unit comprising means for implementing the steps of the process described above.

[0045] The invention also relates to a computer program comprising instructions which, when the program is executed by a computer, lead the latter to implement the steps of the process described above.

[0046] The invention also relates to a computer-readable recording medium comprising instructions which, when executed by a computer, lead him to implement the steps of the process described above. Brief description of the figures

[0047] The invention will be better understood upon reading the following description, given solely by way of example and made with reference to the accompanying drawings in which:

[0048] [Fig-1] is a schematic view of a vehicle comprising a system of braking according to the invention;

[0049] [Fig.2] is an electrical diagram of a braking system according to a first mode of realization of the invention, configured in a first state;

[0050] [Fig.3] is a circuit diagram of the embodiment of [Fig.2], configured in a second state;

[0051] [Fig.4] is a circuit diagram of the mode of [Fig.2], configured in a third state;

[0052] [Fig.5] is a diagram of a method for controlling switching means of the invention according to a first embodiment of the invention;

[0053] [Fig.6] is an electrical diagram of a braking system according to a second embodiment of the invention, configured in a first state;

[0054] [Fig.7] is a circuit diagram of the embodiment of [Fig.6], configured in a second state;

[0055] [Fig.8] is a circuit diagram of the embodiment of [Fig.6], configured in a third state; and

[0056] [Fig.9] is a diagram of a method for controlling switching means of the invention according to a second embodiment of the invention. Detailed description

[0057] Figure [Fig. 1] shows a vehicle 1, more particularly a motor vehicle, comprising wheels and a braking system 2 according to a first embodiment.

[0058] This first embodiment is illustrated in more detail in Figures 2 to 4. This braking system 2 comprises a first lead-acid battery 3 and a second lead-acid battery 4. Batteries 3 and 4 are identical. They are 12-volt batteries. Each battery has respective positive and negative terminals. The invention is not limited to a particular type of electric battery. It could be another type of electric battery, in particular a metal-ion type, for example lithium-ion or sodium-ion. The batteries could also deliver a voltage other than 12 V.

[0059] System 2 also includes an electromechanical braking device 5 for vehicles, called an "EMB" (for "Electro-Mechanical Brake"). It includes a terminal A and a terminal B. This type of braking device is powered by electricity to generate a clamping torque intended to brake and stop the vehicle's wheels. More generally, the invention is designed to operate with any braking device requiring electrical energy to perform braking, such as a parking or emergency brake (called "EPB" for "Electric Parking Brake"), or an electromagnetic braking device.

[0060] Batteries 3 and 4 are connected to each other and to the braking device 5 by an electrical circuit equipped with switching means. These switching means are two relay-type switches K1 and K2. Alternatively, it comprises switching transistors or dry contact or moving contact switches.

[0061] The switch Kl has three terminals: a common terminal C, a terminal D in the first closed position and a terminal E in the second closed position.

[0062] The switch K2 has a common terminal F and a closed-position terminal G. Since the switch K2 has only two possible positions, it could be called a "switch" rather than a "two-position switch".

[0063] Battery 3 is connected, by its positive terminal, to the first closed position terminal D of the KL switch. Battery 3 is connected, by its negative terminal, to the second closed position terminal E of the KL switch. Battery 3 is also connected, by its negative terminal, to the electrical ground of the system.

[0064] Battery 4 is connected, by its negative terminal, to the common terminal C of switch KL. Battery 4 is connected, by its positive terminal, to the common terminal F of switch K2.

[0065] The braking device 5 is connected, via its terminal B, to the common terminal F of the switch K2. The braking device 5 is connected, via its terminal A, to the second closed position terminal E of the switch K2.

[0066] The first closed position terminal D of the switch K1 is connected to the closed position terminal G of the switch K2.

[0067] It follows from this assembly that:

[0068] - the K2 relay has two positions:

[0069] - an open position;

[0070] - a closing position of a battery 4 bypass circuit, so as to connect battery 3 alone to device 5 when relay Kl is in the open position; and

[0071] - the Kl relay has three positions:

[0072] - an open position;

[0073] - a closing position of a series connection circuit, so as to connect the two batteries 3 and 4 in series to device 5 when the relay Kl is in the open position;

[0074] - a closing position of a bypass circuit of battery 3, so as to Connect battery 4 alone to device 5 when relay K2 is in the open position.

[0075] Finally, the braking system 2 includes a control unit 6, schematically illustrated in [Fig. 1], configured to collect the voltages generated by each of the batteries 3 and 4, and to control relays K1 and K2 according to each of these voltages. It is connected by means not shown to batteries 3 and 4 and to the switching means. It includes means for implementing the steps of a method for controlling the switching means K1 and K2 according to a first implementation 100 described below. In particular, it includes a computer-readable recording medium 7 comprising instructions which, when executed by a computer, cause the computer to implement the steps of the method 100.This medium allows the execution of a computer program 8 comprising instructions which, when the program is executed by a computer, lead the latter to implement the steps of the process 100. By "computer" and "computer program", one could also speak of "calculator" and respectively of "calculator program".

[0076] The relays K1 and K2 are therefore controlled by the unit 6 to switch from one position to another depending on the voltage at their respective terminals, in the method 100 described below with reference to [Fig.5].

[0077] At step 110 of this process 100, the control unit 6 obtains the respective voltages of batteries 3 and 4.

[0078] In step 120, if the two voltages are equal to or greater than a predetermined threshold, for example 9 V, the switching means Kl and K2 are configured in a state of connection of both batteries 3 and 4 in series to the braking device 5, and, if the voltage of battery 3, respectively of battery 4, has a value less than the threshold of 9 V, the switching means Kl and K2 are configured in a state of connection of battery 4 alone, respectively of battery 3 alone, to the braking device 5. The value of the threshold is advantageously determined during the design of the braking system and corresponds, for example, to the value below which a faulty battery does not participate positively in the operation of the braking devices and / or to the value below which a further discharge would be detrimental to the faulty battery.

[0079] Three states of system 2 are thus provided depending on the voltages generated by the two batteries, depending on a battery voltage threshold set at 9 V. This threshold could be set at another value.

[0080] Thus, in a first state, illustrated in [Fig. 2] by the arrows tracing the circuit in the figure, the two batteries 3 and 4 each generate a voltage greater than or equal to the predetermined threshold of 9 V. In this state, referred to as "normal operation," since this threshold is met, the relay Kl is controlled by the unit 6 to be in first In the closed position, connecting its common terminal C to its terminal D, relay K2 is controlled by unit 6 to be in the open position. In this state, the two batteries 3 and 4 are connected in series to the braking device 5. The voltages generated by the two batteries are therefore added together to power the braking device 5.

[0081] The second state, illustrated in [Fig. 3], is adopted by unit 6 when battery 3 generates a voltage below the 9 V threshold. This is a so-called "degraded" mode. In this state, relay K1 switches to its second closed position, connecting its common terminal C to its terminal E, and relay K2 remains in the open position. These connections thus form a bypass circuit for battery 3, so as to connect battery 4 alone to device 5. Thanks to this change, the isolated battery 3 does not discharge into battery 4, and vice versa. The braking system 2 continues to operate in degraded mode thanks to battery 4; that is, the braking device 5 continues to have braking power available thanks to the energy supplied by battery 4. It is intended that an alert will be provided to the vehicle driver by means not shown to warn them of this change of state.This system ensures sufficient, albeit weaker, braking until battery 3 is restored to normal operating condition.

[0082] The third state, illustrated in [Fig. 4], is adopted by unit 6 when battery 4 generates a voltage below the 9 V threshold. This is also a so-called "degraded" state. In this state, relay K1 switches to the open position, and relay K2 switches to the closed position, connecting its common terminal F to its terminal G. These connections thus form a bypass circuit for battery 4, so as to connect only battery 3 to device 5. Thanks to this change, the isolated battery 4 does not discharge into battery 3, and vice versa. The braking system 2 continues to operate in degraded mode thanks to battery 3; that is, the braking device 5 continues to have braking power available thanks to the energy supplied by battery 3. It is intended that an alert will be provided to the driver of vehicle 1 by means not shown.However, the system ensures sufficient braking until battery 4 is restored to normal operating condition.

[0083] Alternatively, the braking system 2 does not include a control unit 6. Relays K1 and K2 are controlled by the voltages across their respective terminals. They are therefore autonomous. Since these respective voltages are directly derived from the voltages generated by the batteries in the circuit, the relays are thus indirectly controlled by the voltages generated by batteries 3 and 4, having been pre-configured to switch from one state to the other when the predetermined threshold of 9 V across the battery terminals is crossed in either direction. The method 100 is therefore identical, but it is implemented by relays K1 and K2 themselves rather than by the control unit 6. The three possible states of system 2 are therefore identical.

[0084] We will now describe a second embodiment with reference to figures 5 to 7, illustrating a braking system 9.

[0085] In this system 9, batteries 3 and 4, as well as the braking device 5, are identical to those of system 2. Unit 6 is configured to implement a method for controlling switching means according to a second embodiment 200 described below. The negative terminal of battery 3 is always connected to the system's electrical ground.

[0086] The switching means are, however, different from those of system 2.

[0087] These switching means include three diodes J1, J2 and J3, and a relay K3. The relay could be another type of switch. Each diode has an anode and a cathode. Relay K3 has a common terminal H and a normally closed terminal I.

[0088] Battery 3 is connected, via its positive terminal, to terminal I of relay K3. Battery 3 is connected, via its negative terminal, to the anode of diode J2.

[0089] Battery 4 is connected, via its negative terminal, to the common terminal H of relay K3. Battery 4 is connected, via its positive terminal, to the anode of diode J3.

[0090] The braking device 5 is connected, via its terminal B, to the cathode of diode J3. The braking device 5 is connected, via its terminal A, to the anode of diode J2.

[0091] Diode Jl is connected, via its cathode, to the cathode of diode J3. Diode Jl is connected, via its anode, to the closed position terminal I of relay K3.

[0092] Diode J2 is connected by its cathode to the common terminal H of relay K3.

[0093] The relay K3 is controlled by the control unit 6 according to a method 200 illustrated in the [Fig.9].

[0094] Thus, in step 210 of this process 200, the control unit 6 obtains the respective voltages of batteries 3 and 4.

[0095] At step 220, if both voltages are greater than or equal to 9 V, K3 is put in the closed position, so as to achieve a connection state of both batteries 3 and 4 in series to the braking device 5, and, if the voltage of battery 3, respectively of battery 4, has a value less than the threshold of 9 V, K3 is put in the open position, so as to achieve a connection state of battery 4 alone, respectively of battery 3 alone, to the braking device 5, depending on the state of the diodes described below.

[0096] Diodes J1, J2, and J3 are forward-biased when the potential at their respective anodes is greater than the potential at their respective cathodes, and reverse-biased otherwise. They are therefore indirectly controlled by the voltages generated by batteries 3 and 4 in the circuit. They are thus configured to switch from "reverse-biased" to "forward-biased" or vice versa depending on the voltages generated by the batteries relative to the 9 V threshold and depending on the position of relay K3.

[0097] It follows from this assembly that:

[0098] - the K3 relay has:

[0099] - a closing position of a series connection circuit, so as to connect the two batteries 3 and 4 in series to device 5 when diodes J1 and J2 are blocking;

[0100] - an open position;

[0101] - diode J1 is conducting when the voltage across battery 4 is less at the predetermined threshold of 9 V, to form a bypass circuit for battery 4, so as to connect battery 3 alone to device 5;

[0102] - diode J2 is conducting when the voltage across battery 3 is less at the predetermined threshold of 9 V, to form a bypass circuit for battery 3, so as to connect battery 4 alone to the device.

[0103] - diode J3 is conducting when the voltage across the terminals of battery 4 is greater at the predetermined threshold of 9 V.

[0104] The states illustrated in figures 6 to 8 are the symmetrical versions of those in figures 2 to 4.

[0105] Thus, in the so-called "normal" state of [Fig. 6], the voltages generated by batteries 3 and 4 are greater than or equal to 9 V. Switch K3 is therefore controlled by unit 6 to be in the closed position. Due to the potentials then generated by the batteries and the positions of the diodes, diodes J1 and J2 are reverse-biased, and diode J3 is forward-biased. The two batteries 3 and 4 are therefore connected in series to device 5.

[0106] In the degraded state shown in [Fig. 7], the voltage of battery 3 is below the predetermined threshold of 9 V. Switch K3 is then driven, by its voltage, to open. Consequently, and given the generated potential differences, diode J2 becomes forward-biased, while diode J1 remains reverse-biased. These states thus form a bypass circuit for battery 3, so as to connect only battery 4 to device 5.

[0107] In the degraded state shown in [Fig. 8], the voltage of battery 4 is below the predetermined threshold of 9 V. Switch K3 is then triggered, by its voltage, to open. Consequently, and given the generated potential differences, diode J1 becomes forward-biased, and diode J3 becomes reverse-biased. These states thus form a bypass circuit for battery 4, so as to connect only battery 3 to device 5.

[0108] Alternatively, unit 6 is not present. Switch K3 changes state according to the voltage across its terminals; it is therefore self-regulating. Since this voltage is directly derived from the voltages generated by batteries 3 and 4 in the circuit, relay K3 is thus indirectly controlled by the voltages generated by batteries 3 and 4. It is therefore configured to change state according to the voltages generated by the two batteries 3 and 4 relative to the 9 V threshold.

[0109] It should be noted that the implementation of a higher voltage, for example 24 V with Connecting two batteries in series, instead of a 12V supply, not only limits the electrical current flowing between the batteries and the braking devices and the associated Joule heating losses, but also provides higher torque to the braking device motors. Furthermore, a geared motor in the braking devices of the invention can have a lower reduction ratio, but one sufficient to allow braking in degraded mode.

[0110] The invention is not limited to the embodiments shown, and other embodiments will be obvious to those skilled in the art. In particular, it is possible to vary the 9 V threshold. It is also possible, in the second embodiment, to replace relay K3 with a fourth diode.

[0111] Relays K1, K2 and K3 can be replaced by other types of switching components, in particular switching transistors or dry contact or moving contact switches.

[0112] It may be provided that the braking system periodically performs a functional test of switches K1 to K3 and / or diodes J1 to J3. The batteries are recharged by a generator, typically a vehicle alternator. List of references

[0113] 1: vehicle

[0114] 2: braking system according to a first embodiment 3: Power supply battery

[0115] 4: Power supply battery

[0116] 5: braking device

[0117] 6: control unit

[0118] 7: recording medium

[0119] 8: computer program

[0120] 9: braking system according to a second embodiment

[0121] 100: method for controlling switching means according to a first mode of operation implementation

[0122] 200: method for controlling switching means according to a second mode of implementation

[0123] Kl: three-position switch

[0124] K2: switch or two-position switch

[0125] K3: switch or two-position switch

[0126] J1: diode

[0127] J2: diode

[0128] J3: diode

Claims

Demands

1. Braking system (2; 9) comprising: - a braking device (5), - first (3) and second (4) batteries for powering the braking device (5), characterized in that it comprises switching means (K1, K2; J1, J2, J3, K3) between the batteries (3, 4) and the braking device (5), wherein the switching means are controlled by first and second parameters respectively of the first (3) and second (4) batteries, such that, if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means (K1, K2; J1, J2, J3, K3) are configured in a state of connection of the two batteries (3, 4) in series to the braking device (5), and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means (K1, K2;J1, J2, J3, K3) are configured in a state of connection of the second battery (4) alone, respectively of the first battery (3) alone, to the braking device (5).;

2. Braking system (2; 9) according to the preceding claim, wherein each parameter is a voltage across the terminals of the respective battery (3, 4).

3. Braking system (2; 9) according to any one of the preceding claims, wherein the switching means (K1, K2; J1, J2, J3, K3) comprise at least one switch-forming component which changes state according to a voltage value across the component.

4. Braking system (2; 9) according to any one of the preceding claims, comprising a control unit (6) obtaining the value of at least one of the parameters of the batteries (3,4), preferably the value of the parameter of each battery (3,4), and controlling the switching means (K1, K2; J1, J2, J3, K3) according to each value.

5. Braking system (2; 9) according to any one of the preceding claims, wherein the switching means (K1, K2; J1, J2, J3, K3) comprise at least one switch-forming component chosen from: a diode, a switching transistor, a dry or moving contact switch, and a relay.

6. A braking system (2) according to any one of the preceding claims, wherein the switching means comprise a switch (K2) and a three-position switch (K1), - the switch (K2) having: - a closing position of a bypass circuit of the second battery (4), so as to connect the first battery (3) alone to the device (5) when the three-position switch (K3) is in the open position; - an open position, - the three-position switch (Kl) having: - a closing position of a series connection circuit, so as to connect in series the two batteries (3, 4) to the device (5) when the switch is in the open position; - a closing position of a bypass circuit of the first battery (3), so as to connect the second battery (4) alone to the device (5) when the switch (K2) is in the open position; - an open position.

7. System (9) according to any one of claims 1 to 5, wherein the switching means comprise a switch (K3) and first (J1) and second (J2) diodes, - the switch (K3) having: - a closing position of a series connection circuit, so as to connect in series the two batteries (3, 4) to the device (5) when the first (J1) and second (J2) diodes are blocking; - an open position; - the first diode (Jl) being forward-biased when a voltage across the terminals of the second battery (4) is below the threshold, to form a bypass circuit of the second battery (4), so as to connect the first battery (3) alone to the device (5); - the second diode (J2) being forward-biased when a voltage across the terminals of the first battery (3) is below the threshold, to form a bypass circuit for the first battery (3), of way to connect the second battery (4) alone to the device (5).

8. System (9) according to the preceding claim, wherein the first battery (3) is connected to an electrical ground, the second (4) battery being connected to a third diode (J3), this third diode (J3) being conducting when a voltage across the terminals of the second battery (4) is greater than the threshold.

9. Braking system (2; 9) according to any one of the preceding claims, wherein the batteries are of the lead-acid or metal-ion type, for example lithium-ion or sodium-ion.

10. Vehicle (1) comprising a braking system (2; 9) according to any one of the preceding claims.

11. A method (100; 200) for controlling switching means (K1, K2; J1, J2, J3, K3) for organizing the electrical connection between a braking device (5) and the first (3) and second (4) power supply batteries of the braking device, the method comprising the following steps: - Obtaining (110; 210) first and second parameters respectively of the first (3) and second (4) batteries, - (120; 220) if the parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means (K1, K2; J1, J2, J3, K3) are configured in a state of connection of the two batteries (3, 4) in series to the braking device (5), and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means (K1, K2;J1, J2, J3, K3) are configured in a state of connection of the second battery (4) alone, respectively of the first battery (3) alone, to the braking device (5).;

12. Data processing unit (6) comprising means for carrying out the steps of the process (100; 200) according to the preceding claim.

13. A computer program (8) comprising instructions which, when the program is executed by a computer, cause the computer to put

14. implements the steps of the process (100; 200) of claim 11. Computer-readable recording medium (7) comprising instructions which, when executed by a computer, cause the computer to implement the steps of the process (100; 200) of claim 11.

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