FR3092209A1 - PROCESS AND SYSTEM FOR MANAGING THE POWER SUPPLY OF AN ON-BOARD NETWORK OF A MOTOR VEHICLE - Google Patents

Abstract

Method for managing the power supply of a network (200) on board a motor vehicle, the management method comprising a generation of an alternating electric current by a synchronous electric machine (111) with independent excitation coupled to the chain traction of the motor vehicle, rectification of said alternating current by a rectifier (112) to obtain a direct electric current to supply the on-board network, supply to a consumer (220) of said on-board network, the current excitation (cons_Iexc, cons_Vexc) of the electric machine regulating the alternating current generated by said electric machine according to the needs of the consumer and a state (Estk) of a storer (210) of the on-board network, a setpoint ( current cons_I) and a voltage setpoint (cons_V) regulating the direct current rectified by the rectifier, the excitation current of the electric machine also being a function of said rectifier output current setpoint . FIGURE 1

Description

METHOD AND SYSTEM FOR MANAGING THE POWER SUPPLY OF AN ON-BOARD NETWORK OF A MOTOR VEHICLE

The invention relates to the management of electrical energy within a motor vehicle, for example within a vehicle with hybrid motorization, and more particularly to the management of the electrical energy supply of a network of edge of the motor vehicle.

Motor vehicles include one or more on-board networks comprising an electrical energy store and consumers supplied with electrical energy by said store.

The on-board network is suitable for the circulation of direct current. If necessary, one or more inverters and/or rectifiers ensure the transformation between the direct current and an alternating current.

Said consumers provide safety functions, such as the headlights or ABS, comfort, such as power steering or ventilation, or information, such as the dashboard or GPS.

But consumers can also require higher powers, such as when it comes to an electric air conditioning compressor or when it comes to an electric traction machine, such as an electric traction machine on one of the axles of a motor vehicle where a main engine drives the other axle.

The supply of electrical energy to these consumers is therefore essential to ensure the proper functioning of the motor vehicle.

The on-board network is also supplied with electrical energy by an alternating current synchronous electrical machine and rectifier assembly. The electric machine is generally connected to an element of the traction chain of the motor vehicle, such as for example a heat engine or the wheels, and the rectifier is connected to the electric machine and to the on-board network.

The electrical energy supplied by the electrical machine and rectifier assembly is used to recharge the storage unit and to supply the consumers of the on-board network.

A management system comprising the electric machine and rectifier assembly conventionally makes it possible to control the voltage at the terminals of the rectifier supplying the on-board network, in parallel with which the storer is connected, in order to ensure the supply of electrical energy to the consumers of the network. on board.

Such a management system does not, however, make it possible to control the state of charge of the storage tanker independently of the supply of consumers from the on-board network.

Recharging the storer, for example, during an idling phase of the combustion engine causes fluctuations in the speed of said engine causing an unpleasant feeling for the occupants of the vehicle and an increase in the consumption of the combustion engine.

The document US7459801_B2 describes a system for managing an on-board network of a motor vehicle. The management system includes an electrical machine with independent excitation.

Machines with independent excitation are capable, unlike machines with permanent magnets, of modulating their production of electrical energy, thanks to their excitation current, and therefore of controlling the torque taken from the heat engine of the motor vehicle.

In addition, independently excited machines that do not include a magnet do not require the use of rare earths such as Neodymium for their manufacture.

According to document US7459801_B2, the electrical machine with independent excitation controls, thanks to its excitation current, said torque taken from the heat engine while supplying the consumers of the on-board network with electrical energy according to the state of charge of the storer and the electrical energy supply needs of consumers.

Such a machine with independent excitation, however, reacts slowly to a variation in the excitation current that jeopardizes the power supply to the consumers of the on-board network.

The object of the invention is to propose a method and a system for managing the supply of an on-board network of a motor vehicle controlling the power taken from the element of the traction chain of the motor vehicle to which the management system is coupled while ensuring the maintenance of the supply of said consumers in accordance with their needs.

To this end, there is proposed, firstly, a method for managing the power supply of an on-board network of a motor vehicle, the management method comprising generation of an alternating electric current by a synchronous electric machine with independent excitation coupled to the traction chain of the motor vehicle, a rectification of said alternating current by a rectifier to obtain a direct electric current to supply the on-board network, a power supply for a consumer of said on-board network, the excitation current of the electric machine regulating the alternating current generated by said electric machine according to the needs of the consumer and a state of a storage device of the on-board network.

This management process makes it possible to supply electrical energy to the consumer(s) of the on-board network. This electrical energy is generated by an electrical machine delivering an alternating current and by the rectifier transforming this alternating current into direct current.

The rectifier delivers this direct current thanks to an element of the traction chain of the motor vehicle. The electric machine and rectifier assembly can therefore be connected to a heat engine or to the wheels of the motor vehicle.

The alternating current delivered by the electric machine is regulated, by the excitation current, according to the needs of the consumer.

In this method, a current setpoint and a voltage setpoint regulate the direct current rectified by the rectifier by controlling the rectifier, the excitation current of the electric machine also being a function of said rectifier output current setpoint.

The voltage setpoint indicates the maximum voltage to be guaranteed on the network in current regulation.

This principle of determining the excitation current allows the management method to control the power taken from the element of the traction chain of the motor vehicle to which the electric machine is coupled by the excitation current of said electric machine while ensuring maintaining the supply of said consumers in accordance with their needs.

Various additional features may be provided, alone or in combination:
- the method comprises modifying the output current setpoint of the rectifier as a function of a comparison between a measured current and a reference current value for the regulation;
- the method comprises a modification of the output current setpoint of the rectifier according to a comparison between a voltage measured at the terminals of said rectifier and a minimum voltage admissible by the on-board network;
the method comprises a limitation of the rectifier output current setpoint by a maximum current variable able to be delivered by the rectifier;
- The voltage setpoint depends on the state of the storage device, a state of the on-board network and the needs of the motor vehicle.

Secondly, an electrical circuit of a motor vehicle is proposed, the electrical circuit comprising an on-board network and a power management system for at least one consumer and one storer of the on-board network, the management system comprising a synchronous electric machine with independent excitation coupled to the traction chain of the motor vehicle and a rectifier connected to said electric machine and to the on-board network, the management system controlling the excitation current of the electric machine regulating the alternating current generated by said electric machine according to the needs of the consumer and a state of the on-board network storage device, the management system controlling an intensity setpoint and a voltage setpoint regulating the direct current rectified by the rectifier, by controlling the rectifier, the excitation current of the machine also being controlled as a function of said rectifier output current setpoint.

As a variant, the storer is of the lead, lithium or nickel-metal hydride type.

It is proposed, thirdly, a motor vehicle comprising an electrical circuit as previously described, in which a heat engine of the traction chain of the motor vehicle is coupled to the electric machine.

As a variant, the electric machine is coupled to an accessory front panel of the heat engine of the motor vehicle, the electric machine and rectifier assembly being an alternator-starter equipped with a controlled rectifier/inverter, or the electric machine couples the heat engine to a wheel of the motor vehicle, the electric machine also functioning as a traction motor.

Fourthly, a motor vehicle is proposed comprising an electrical circuit as previously described, in which the electrical machine also functions as a traction motor and in which the rectifier also functions as an inverter.

The invention will be better understood, and other aims, characteristics, details and advantages thereof will appear more clearly in the explanatory description which will follow made with reference to the appended drawings given solely by way of example illustrating an embodiment. of the invention and in which:

Figure 1 is a schematic view representing a management system connected to an on-board network;

FIG. 2 is an operating principle diagram of a structure for regulating an electric machine and rectifier assembly of the management system;

FIG. 3 is a flowchart representing an example of the principle of operation of a supervisor of the management system;

FIGS. 4 and 5 are curves representing voltages and currents of various elements of the management system and of the on-board network as a function of time, according to one embodiment of the invention.

Figure 1 is an electrical diagram representing a management system 100 connected to a network 200 on board.

The management system 100 comprises an electric machine 111 connected to an element capable of supplying power (not shown in the diagram) and a rectifier 112 connected to the electric machine 111 and to the on-board network 200.

The electrical machine 111 is driven in rotation by said element.

According to one embodiment, the management system 100, the on-board network 200 and the element belong to a motor vehicle.

According to one embodiment, the element belongs to a traction chain of the motor vehicle. The element is, for example, a heat engine.

According to one embodiment, the motor vehicle is a vehicle with hybrid motorization.

The motor vehicle is, for example, a mild hybrid vehicle (MHEV) for which the electric machine 111 is connected to an accessory front of the heat engine by means, for example, of a belt or a chain.

The motor vehicle is, for example, a rechargeable hybrid vehicle (PHEV) for which the electric machine 111 is coupled to at least one wheel.

According to different embodiments, the electric machine is driven by an element of the traction chain of the motor vehicle.

According to one embodiment, the element of the traction chain is at least one wheel of the motor vehicle allowing, for example, regenerative braking of the motor vehicle.

According to one embodiment, the motor vehicle is electrically powered.

According to one embodiment, the electric machine 111 can operate either as an electric motor or as an electric current generator and the rectifier 112 can also serve as an inverter.

According to the embodiment shown, the electric machine 111 is three-phase. According to different embodiments, the electric machine 111 is polyphase, for example 6-phase.

The electric machine 111 is independently excited. A supervisor 121 of the management system 100 supplies the electrical machine 111 with the cons_Vexc excitation current voltage setpoint and a cons_Iexc excitation current intensity setpoint.

The excitation current voltage setpoint cons_Vexc makes it possible to modulate the amplitude of the voltage of the current delivered by the electric machine 111, therefore of the voltage of the current delivered by the rectifier 112, via the excitation current, up to current limitation by the current cons_Iexc setpoint.

This voltage setpoint cons_Vexc is essential to obtain behavior of the conventional alternator type so that this voltage setpoint cons_Vexc represents the voltage setpoint to be obtained at the output of the rectifier 112 when the latter is used in “uncontrolled” mode.

The excitation intensity setpoint cons_Iexc is used to limit the production capacity of the electrical machine 111 i.e. the torque it takes from the motor. The excitation intensity setpoint cons_Iexc thus makes it possible to optimize the energy consumption of the motor or to allocate, for example, to the wheels of the motor vehicle a greater torque delivered by the motor.

The management system 100 also comprises a regulation structure 122, the regulation structure 122 being connected, on the one hand, to the supervisor 121 and, on the other hand, to the rectifier 112.

The voltage setpoint indicates the maximum voltage to be guaranteed on the network in current regulation.

The supervisor 121 provides the regulation structure 122 with an output voltage setpoint cons_V from the rectifier 112 and an output current setpoint cons_I from the rectifier 112.

The regulation structure 122 controls the rectifier 112, according to the voltage setpoint cons_V, the intensity setpoint cons_I, a speed Wmel of rotation of the electric machine 111 and an intensity Imel supplied by the machine 111 electrical, so that the rectifier 112 delivers a current whose voltage Vrdb and intensity Irdb approaches as much as possible the setpoints cons_V in voltage and cons_I in intensity calculated by the supervisor 121.

The voltage Vrdb at the output of the rectifier 112 is controlled, preferably, so as to modulate the power supplied by the electric machine 111.

According to one embodiment, the rectifier 112 is pulse-width modulated.

Such a rectifier 112 also makes it possible to regulate the torque taken by the electric machine 111 from the motor.

The control of the rectifier 112 allows a recharging of the storer 210 at constant drawn torque if the state of the on-board network 200 allows it.

In the embodiment represented, the supervisor 121 receives the Ered state of the rectifier 112. The Ered state of the rectifier 112 takes into account, for example, the temperature or even a degraded mode of the rectifier 112.

In the embodiment shown, the supervisor 121 receives the Emel state from the electrical machine 111. The Emel state of the electric machine 111 takes into account, for example, the temperature or the speed of rotation of the electric machine 111.

The on-board network 200 comprises an electrical energy storer 210 and consumers 220 supplied with electrical energy by said storer 210 and/or by the assembly formed by the electric machine 111 and the rectifier 112. Said assembly formed by the machine 111 electric and the rectifier 112 can be called generator.

In the illustrated embodiment, the supervisor 121 also receives the state Estk of the storer 210. The state Estk of the storer 210 takes into account, for example, the load or even the temperature of the storer 210.

In the embodiment shown, the output intensity Irdb of the rectifier 112 is equal to the sum of the intensity Istk of a current flowing in the storer 210 and the intensities Idisp at a branch of said consumers 220.

According to an embodiment represented, in particular in FIGS. 4 and 5, the storer 210 is a 12 volt battery.

According to different embodiments, the storer 210 is a 48 volt, 150 volt or even 200 volt battery.

According to different embodiments, the storer 210 is of the lithium type and comprises a management member, the storer 210 is of the lead type and includes a member for estimating its state, the storer 210 is of the nickel-metal hydride type or even graphene.

According to one embodiment, one of the consumers 220 is a DC/DC power converter. This converter can be used to supply a second electrical network.

As represented in FIG. 2, the supervisor 121 includes a function 121a for determining the output voltage setpoint cons_V of the rectifier 112.

The supervisor 121 also includes a function 121b for determining the setpoint cons_I of the output intensity of the rectifier 112.

According to the embodiment shown, the functions 121a, 121b for determining the voltage setpoint cons_V and the current setpoint cons_I are dependent on each other. According to different embodiments or for certain phases of life of the vehicle, these functions 121a, 121b are independent. These determination functions will be presented during the description of Figure 3.

As represented in FIG. 2, the regulation structure 122 comprises, after transmission of the voltage cons_V and intensity cons_I setpoints, a voltage regulation loop by means of a comparison 122a between the voltage setpoint cons_V and the voltage Rectifier 112 output Vrdb then a correction 122b as a result of this comparison 122a.

The regulation structure 122 comprises, after this regulation loop, a limitation 122c of maximum intensity value by the smaller value between the intensity setpoint cons_I and a maximum intensity variable I_max able to be delivered by the rectifier 112.

The maximum intensity variable I_max is a function of the state Emel of the electrical machine 111, of the state Estk of the storer 210 and of the operating mode applied. The maximum intensity variable I_max is used to manage functional or degraded modes, for example according to predetermined thermal conditions.

Said limitation loop 122c is internal to the structure 122 of regulation.

The regulation structure 122 comprises, after this intensity limitation, an intensity regulation loop by means of a comparison 122d between the previously limited intensity and the output intensity Irdb of the rectifier 112 then a correction 122e in consequence of this comparison 122d.

Such use of the voltage setpoint cons_V and the current setpoint cons_I allows fine regulation of the electrical machine 111.

A similar regulation structure exists for the regulation of the electrical machine 111 by the voltage cons_Vexc and excitation current intensity cons_Iexc instructions.

FIG. 3 illustrates an example of the principle of operation of the supervisor 121 for determining the current setpoint cons_I of the rectifier 112, the voltage setpoint cons_V of the rectifier 112, the setpoint cons_Iexc of the intensity of the excitation current of the electrical machine 111 and the voltage setpoint cons_Vexc of the excitation current of the electrical machine 111.

To determine the intensity setpoint cons_I, the supervisor 121 identifies the operating mode to be applied. The controlled rectifier 112 makes it possible to modulate the power supplied by the electric machine 111 according to the needs of the latter.

Three operating modes are available.

One mode of operation is by voltage regulation regardless of the intensity consumed by the on-board network 200. This mode of operation is regularly used in the state of the art.

This mode of operation allows regulation with respect to the voltage Vrdb of the on-board network 200 or with respect to the voltage Vstk at the terminals of the storer 210.

A mode of operation is by regulation with respect to the storer 210 regulating the intensity with respect to the intensity Istk of a current flowing in the storer 210. This mode of operation being limited in maximum Vrdb_max and minimum Vrdb_min voltages admissible by the network 200 on board.

The mode of regulation with respect to the storer 210 makes it possible to control a recharging or a discharge of the storer 210 with a controlled intensity and a maintenance of the charge of the storer 210 with a zero intensity.

A mode of operation is by regulation with respect to the electrical machine 111 and rectifier 112 assembly regulating the intensity with respect to the intensity Irdb at the output of the rectifier 112. This mode of operation also being limited in voltages Vrdb_max maximum and Vrdb_min minimum admissible by the network 200 on board.

If the mode of regulation with respect to the storer 210 is chosen, the supervisor 121 makes a variable I_mes equal to the value of the intensity Istk of the current flowing in the storer 210. Parameters of the correction are calibrated and correspond to the values defined for the storer 210. Internal control laws correspond to those defined for the storer 210.

If the mode of regulation with respect to the electrical machine 111 and rectifier 112 assembly is chosen, the supervisor 121 makes the variable I_mes equal to the value of the intensity Irdb at the output of the rectifier 112. The correction parameters are calibrated and correspond to the values defined for said set. The internal control laws correspond to those defined for the whole.

The supervisor 121 then compares the variable I_mes with a reference intensity value Istk_ref for the regulation constructed by a function not described here.

The value Istk_ref corresponds to a regulation setpoint for the storer 210 when the operating mode applied is regulation with respect to the storer 210.

If the I_mes variable is less than the Istk_ref reference current value for regulation, an I_cc component is increased as long as this I_cc component is less than the I_max variable.

If the I_mes variable is equal to the Istk_ref value of reference current for regulation, the I_cc component is maintained.

If the I_mes variable is greater than the Istk_ref reference current value for regulation, the I_cc component is reduced as long as the I_cc component is positive.

The component I_cc, allowing the calculation of the output current setpoint cons_I of the rectifier 112, cannot be negative.

Independently of the determination of the value of the component I_cc, the supervisor 121 compares the voltage Vrdb at the output of the rectifier 112 with a value Vrdb_min of minimum voltage and with a value V_minsec of minimum safety voltage constructed by functions not described here.

The minimum voltage value Vrdb_min corresponds to a minimum set point to be guaranteed on the on-board network 200 when the operating mode applied is regulation with respect to the storage device 210. The minimum voltage value Vrdb_min is constructed by a function not described here.

The minimum voltage value Vrdb_min depends on the state Emel of the electrical machine 111, the state Estk of the storer 210, the consumers 220 of the on-board network 200 activated and the operating mode applied.

If the value of the voltage Vrdb at the output of the rectifier 112 is lower than the minimum safety voltage value V_minsec, a component I_cv is increased as long as this component I_cv is lower than the variable I_max.

If the value of voltage Vrdb at the output of rectifier 112 is greater than or equal to minimum safety voltage value V_minsécu and less than minimum voltage value Vrdb_min, component I_cv is maintained.

If the value of voltage Vrdb at the output of rectifier 112 is greater than or equal to minimum voltage value Vrdb_min, component I_cv is reduced as long as component I_cv is positive.

The component I_cv, allowing the calculation of the output current setpoint cons_I of the rectifier 112, cannot be negative.

Once the components I_cc and I_cv have been determined, the output current setpoint cons_I of the rectifier 112 is, in a simplified manner, made equal to the minimum between the variable I_max and the sum of the components I_cc and I_cv.

The I_cc component is thus the part that contributes to the output current setpoint cons_I of the rectifier 112 for the current servo-control either of the electric machine 111 or of the storer 210. The I_cc component is between 0 and I_max.

The component I_cv is, for its part, the part contributing to the setpoint cons_I of output intensity of the rectifier 112 to guarantee a minimum voltage on the on-board network 200 subject to a capacity of production of electrical energy by the machine 111 electric sufficient. The I_cv component is between 0 and I_max.

The determination of the I_cv component is faster than the determination of the I_cc component in order to ensure good quality for the on-board network 200.

Thus, when the voltage Vrdb at the output of the rectifier 112 is greater than a maximum voltage value Vrdb_max admissible by the on-board network 200, the output current setpoint cons_I of the rectifier 112 decreases via a reduction in the component I_cv up to that the latter is equal to zero.

When the voltage Vrdb at the output of the rectifier 112 is lower than the minimum voltage value Vrdb_min required by the on-board network 200, the output current setpoint cons_I of the rectifier 112 increases via an increase in the component I_cv. As the reference current value Istk_ref is no longer respected, the I_cc component decreases until the latter is equal to zero.

When the voltage Vrdb at the output of the rectifier 112 is lower than the minimum safety voltage value V_minsécu, the mode of operation by regulation of the voltage Vrdb of the on-board network 200 is used.

Independently of the determination of the value of the output current setpoint cons_I of the rectifier 112, the supervisor 121 determines the output voltage setpoint cons_V of the rectifier 112 as a function of the state Estk of the storer 210, of the state Erdb of the on-board network 200 and the needs of the motor vehicle.

The output voltage setpoint cons_V of the rectifier 112 can be defined by a nominal voltage Vrdb_ref to be applied to the on-board network 200, in particular when the mode of regulation with respect to the rectifier 112 is applied. The reference voltage Vrdb_ref for the on-board network 200 is calculated by the supervisor 121.

The voltage setpoint cons_V can also be defined by the maximum voltage value Vrdb_max admissible by the on-board network 200, this value being reached by increasing the intensity setpoint cons_I. The intensity setpoint cons_I makes it possible, as explained above, to limit the current delivered by the electrical machine 111.

The maximum voltage value Vrdb_max is calculated by the supervisor 121 and is used, in particular, when the operating mode applied is regulation with respect to the storer 210.

According to embodiments, the current setpoint cons_I and the voltage setpoint cons_V change at the same time.

Independently of the determination of the value of the intensity setpoint cons_I and of the output voltage setpoint cons_V of the rectifier 112, the supervisor 121 determines the setpoint cons_Iexc of intensity of the excitation current of the electric machine 111 according to the state Estk of the store 210, the state Erdb of the on-board network 200 and the needs of the motor vehicle.

Independently of the determination of the value of the current setpoint cons_I, of the setpoint cons_V of the output voltage of the rectifier 112 and of the setpoint cons_Iexc of the intensity of the excitation current of the electric machine 111, the supervisor 121 determines the voltage setpoint cons_Vexc of the excitation current of the electrical machine 111 .

Thus, when the Vrdb voltage regulation mode of the on-board network 200 is applied, the output current setpoint cons_I of the rectifier 112 is equal to the current variable I_max and the output voltage setpoint cons_V of the rectifier 112 is a function of the needs of the motor vehicle, the constraints of the on-board network 200 and the nominal voltage Vrdb_ref to be applied to the on-board network 200.

When the mode of regulation with respect to the electrical machine 111 and rectifier 112 assembly is applied, the intensity setpoint cons_I is a function of the needs of the motor vehicle and the voltage setpoint cons_V is a function of the needs of the motor vehicle, the constraints of the on-board network 200 and the nominal voltage Vrdb_ref to be applied to on-board network 200.

When the regulation mode with respect to the storer 210 is applied with the aim of controlling the charging or discharging of the storer 210, the intensity setpoint cons_I is a function of the needs of the motor vehicle and the constraints of the on-board network 200 and the setpoint voltage cons_V is a function of the needs of the motor vehicle, the constraints of the on-board network 200 and the nominal voltage Vrdb_ref to be applied to the on-board network 200.

When the mode of regulation with respect to the storer 210 is applied with the aim of maintaining the load of the storer 210, the intensity setpoint cons_I is zero and the voltage setpoint cons_V is a function of the needs of the motor vehicle, the constraints of the network 200 edge and the nominal voltage Vrdb_ref to be applied to the on-board network 200.

The constraints of the on-board network 200 relate to the constraints and the state of the various consumers 220 of the on-board network 200 which have an impact on said operating modes such as, for example, the storer 210, the maximum voltage value Vrdb_max and the minimum voltage Vrdb_min value.

The mode of regulation with respect to the storer 210, regulating the intensity with respect to the intensity Istk of a current flowing in the storer 210, makes it possible to use directly within the on-board network 200 the value of the desired intensity . The response to such regulation has the advantage, compared to the prior art, of being faster, allowing finer regulation of the state of charge of the storer 210.

Figure 4 includes, from top to bottom:
- a graph representing the output intensity Irdb of the rectifier 112 as a function of time t,
- a graph representing the reference intensity value Istk_ref for the regulation with respect to the storer 210 (in solid line) and the intensity Istk of the current flowing in the storer 210 (in dotted line) as a function of time t,
- a graph representing the maximum Vrdb_max and minimum Vrdb_min voltages admissible by the on-board network 200 (in solid lines) as well as a voltage Vstk at the terminals of the storer 210 (in thin dotted lines) and the voltage Vrdb at the output of the rectifier 112 ( in wide dotted line) as a function of time t.

Figure 5 includes, from top to bottom:
- a graph representing the output intensity Irdb of the rectifier 112 (solid line) and the intensity setpoint cons_I at the output of the rectifier 112 (dashed line) as a function of time t,
- a graph representing the I_cc (solid line) and I_cv (dotted line) components of the intensity setpoint cons_I, as a function of time t,
- a graph representing the reference intensity value Istk_ref for the regulation with respect to the storer 210 (in solid line) and the intensity Istk of the current flowing in the storer 210 (in dotted line) as a function of time t,
- a graph representing the maximum voltage Vrdb_max admissible by the on-board network 200 (solid line) as well as the voltage Vrdb at the output of the rectifier 112 (dotted line) as a function of time t,
a graph representing the minimum voltage Vrdb_min admissible by the on-board network 200 (solid line) as well as the voltage Vstk at the terminals of the storage device 210 (dotted line) as a function of time t.

In FIGS. 4 and 5, the time is expressed in seconds, the intensities in amperes and the voltages in volts.

In FIGS. 4 and 5, by convention, the currents flowing in the direction of the arrows representing the intensities in FIG. 1 are positive and the currents flowing in the direction opposite to these arrows are negative.

The graphs of FIGS. 4 and 5 respectively represent four phases and three phases of operation in regulation mode with respect to the storer 210.

In this regulation mode, the intensity Istk of the current flowing in the storer 210 is regulated to be as much as possible equal to the reference intensity value Istk_ref.

During these operating phases, the output intensity peaks Irdb of the rectifier 112, resulting in intensity peaks Istk of the current flowing in the storer 210 and voltage peaks, indicate an activation or deactivation of one of the consumers 220 of the 200 on-board network.

During a weak recharge phase A, the storer 210 is recharged at an intensity of 10 amps.

The voltage Vstk at the terminals of the store 210 as well as the voltage Vrdb at the output of the rectifier 112 increase until they reach a substantially equal threshold, in the illustrated embodiment, at 13.5 volts and 14.2 volts respectively.

During a heavy recharging phase B, represented only in FIG. 4, the storer 210 is recharged at an intensity of 90 amps.

The voltage Vrdb at the output of the rectifier 112 is limited in maximum value by the maximum voltage Vrdb_max admissible by the on-board network 200 substantially equal, according to the embodiment shown, to 16 volts.

This limitation of the voltage Vrdb at the output of the rectifier 112 thus limits the intensity Istk of the current flowing in the storer 210.

During a phase C of discharge the storer 210 is discharged at an intensity of 10 amps in figure 4 and 20 amps in figure 5.

The voltage Vstk at the terminals of the storer 210 as well as the voltage Vrdb at the output of the rectifier 112 decrease until the voltage Vstk at the terminals of the storer 210 reaches the minimum voltage Vrdb_min admissible by the on-board network 200 substantially equal, depending on the mode embodiment shown, at 13 volts in Figure 4 and at 12.5 volts in Figure 5.

This limitation of the voltage Vstk at the terminals of the storer 210 thus limits the discharge of the storer 210 making the intensity Istk of the current flowing in the storer 210 substantially zero.

During a load maintenance phase D, the storer 210 is neither recharged nor unloaded.

The intensity Istk at one branch of the storer 210 is thus substantially zero and the voltage Vstk at the terminals of the storer 210 is substantially equal to the minimum voltage Vrdb_min admissible by the on-board network 200.

Such a management system 100 thus makes it possible to supply the on-board network 200 just as necessary by controlling the load of the storer 210.

This control of the load of the storer 210 is carried out by the management of the intensity Istk of the current at a branch of the storer 210 by the electrical machine 111 and rectifier 112 assembly under constraint of the consumers 220 of the on-board network 200.

Such a management system 100 also makes it possible to optimize the energy consumption of the motor vehicle.

Claims (10)

A method of managing the power supply to an on-board network (200) of a motor vehicle, the management method comprising a generation of an alternating electric current by a synchronous electric machine (111) with independent excitation coupled to the chain traction of the motor vehicle, a rectification of said alternating current by a rectifier (112) to obtain a direct electric current to supply the on-board network (200), a supply of a consumer (220) of said network (200 ) on board, the excitation current (cons_Iexc, cons_Vexc) of the electric machine (111) regulating the alternating current generated by said electric machine (111) as a function of the needs of the consumer (220) and of a state (Estk) of a storer (210) of the on-board network (200), the management method being characterized in that a current setpoint (cons_I) and a voltage setpoint (cons_V) regulate the rectified direct current by piloting the rectifier by the rectifier (112), the current of excitation (cons_Iexc, cons_Vexc) of the electric machine (111) also being a function of said setpoint (cons_I) of output current of the rectifier (112). Management method according to the preceding claim, characterized in that it comprises a modification of the setpoint (cons_I) of output current of the rectifier (112) as a function of a comparison between a measured current and a value (Istk_ref) d reference current for regulation. Management method according to any one of the preceding claims, characterized in that it comprises a modification of the setpoint (cons_I) of output current of the rectifier (112) as a function of a comparison between a voltage (Vrdb) measured at the terminals of said rectifier (112) and a minimum voltage (Vrdb_min) admissible by the on-board network (200). Management method according to any one of the preceding claims, characterized in that it comprises a limitation of the setpoint (cons_I) of output intensity of the rectifier (112) by a variable (I_max) of maximum intensity capable of being delivered by the rectifier (112). Management method according to any one of the preceding claims, characterized in that the voltage setpoint (cons_V) is a function of the state (Estk) of the storer (210), of a state (Erdb) of the network (200) on board and needs of the motor vehicle. Electrical circuit of a motor vehicle, the electrical circuit comprising an on-board network (200) and a system (100) for managing the power supply of at least one consumer (220) and a storer (210) of the network (200) on board, the management system (100) comprising a synchronous electric machine (111) with independent excitation coupled to the traction chain of the motor vehicle and a rectifier (112) connected to said electric machine (111) and to the network (200) on board, the management system (100) controlling the excitation current (cons_Iexc, cons_Vexc) of the electric machine (111) regulating the alternating current generated by said electric machine (111) according to the needs of the consumer ( 220) and a state of the storage device (210) of the on-board network (200), the electrical circuit being characterized in that the management system (100) controls a setpoint (cons_I) of intensity and a setpoint (cons_V) voltage regulating by control of the rectifier the rectified direct current pa r the rectifier (112), the excitation current (cons_Iexc, cons_Vexc) of the machine (111) also being controlled according to said setpoint (cons_I) of the output current of the rectifier (112). Electrical circuit according to the preceding claim, characterized in that the storage device (210) is of the lead, lithium or nickel-metal hydride type. Motor vehicle comprising an electric circuit according to any one of claims 6 or 7, characterized in that a heat engine of the motor vehicle traction chain is coupled to the electric machine (111). Motor vehicle according to the preceding claim, characterized in that the electric machine (111) is coupled to an accessory facade of the heat engine of the motor vehicle, the electric machine (111) and rectifier assembly (112) being an alternator-starter equipped with a controlled rectifier / inverter or in that the electric machine (111) couples the heat engine to a wheel of the motor vehicle, the electric machine (111) also functioning as a traction motor. Motor vehicle comprising an electric circuit according to any one of claims 6 or 7, characterized in that the electric machine (111) also functions as a traction motor and in that the rectifier (112) also functions as a traction motor. inverter.