FR3081626A1 - METHOD FOR CONTROLLING A RECHARGE OF AN ENERGY STORAGE DEVICE FOR AN ELECTRICAL MOTOR VEHICLE - Google Patents

Abstract

The invention relates primarily to a method for controlling a recharge of an auxiliary energy storage device (18) associated with an electrical member (20, 22) for a heat engine (16), particularly a motor vehicle, characterized in that said method comprises: - a step of evaluating a state of charge of an auxiliary energy storage device (18), - a step of determining a charge of the auxiliary energy storage device necessary to supply the electrical member (20, 22), and - a step of controlling the recharge of the auxiliary energy storage device (18) as a function of the evaluation of the state of charge of the storage device. auxiliary energy (18) and the load of the auxiliary energy storage device necessary for powering the electrical member (20, 22).

Description

© PROCESS FOR DRIVING A RECHARGE OF AN ENERGY STORAGE DEVICE FOR AN ELECTRICAL MEMBER OF A MOTOR VEHICLE.

FR 3 081 626 - A1 (fa) The invention relates mainly to a method for controlling a recharge of an auxiliary energy storage device (18) associated with an electrical member (20, 22) for a heat engine ( 16), in particular of a motor vehicle, characterized in that said method comprises:

a step of evaluating a state of charge of an auxiliary energy storage device (18),

a step of determining a load of the auxiliary energy storage device necessary to supply the electrical component (20, 22), and

a step for controlling the recharging of the auxiliary energy storage device (18) as a function of the evaluation of the state of charge of the auxiliary energy storage device (18) and of the charge of the storage device auxiliary energy required to power the electrical component (20, 22).

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METHOD FOR DRIVING A RECHARGE OF AN ENERGY STORAGE DEVICE FOR AN ELECTRICAL MEMBER OF A MOTOR VEHICLE The present invention relates to a method for controlling an electrical recharge of an energy storage device for an electric organ of a motor vehicle.

In an autonomous braking system operating in urban traffic with high traffic density with significant risk of collisions, it is necessary, for safety reasons in particular, to be able to continue to supply this system with electrical energy, for a certain period allowing the user to regain control safely, even in the event of saturation of conventional means of supplying the vehicle with electrical energy, such as the alternator or the main battery.

Furthermore, in an electric braking system, the restitution of the same type of physical feeling that a conventional braking system would provide, at the level of the brake pedal, can be achieved by a force generation process. , in particular via a brushless type motor. For security reasons, it is necessary to be able to supply electrical energy to the force feedback generator for braking, even in the event of saturation of conventional electrical supply means.

There is therefore a need to guarantee in advance that energy will be available, to supply at least one of these electrical components, for a predefined period, in the event of a problem with the electrical supply of the vehicle by the conventional means.

The invention aims to meet this need by proposing a method for controlling a recharge of an auxiliary energy storage device associated with an electric member for a heat engine, in particular of a motor vehicle, characterized in that the process includes:

a step for evaluating a state of charge of an auxiliary energy storage device,

a step of determining a load of the auxiliary energy storage device necessary to supply the electrical member, and

a step for controlling the recharging of the auxiliary energy storage device as a function of the evaluation of the state of charge of the auxiliary energy storage device and of the charge of the auxiliary energy storage device necessary for power the electrical component.

According to one implementation, the electrical member is an autonomous braking system or a brake force feedback generator.

According to one implementation, in the case where the electrical component is an autonomous braking system, the charge of the auxiliary energy storage device necessary for its supply is determined as a function of an autonomous driving time at guarantee and an average current consumption during an autonomous braking phase.

According to one implementation, the autonomous driving time to be guaranteed is determined from a state of charge of a primary energy storage device and a requested autonomous running time.

According to one implementation, the average current consumed during an autonomous braking phase is determined from a consumption of sensors and actuators identified to perform the autonomous braking phase.

According to one implementation, in the case where the electrical component is a brake force return generator, the load of the auxiliary energy storage device necessary for its supply is determined from a load electrical power required when using a first braking force feedback law and an electrical charge required when using a second braking force feedback law.

According to one implementation, the charge of the auxiliary energy storage device necessary for its supply is determined by considering a maximum value of the electrical charges necessary in the event of use of the first law of return of braking force. or the second brake force feedback law.

According to one implementation, the electrical charge necessary when using a braking force feedback law is determined from a current consumed and a minimum duration of use to be guaranteed for security needs.

According to one implementation, the recharging of the auxiliary energy storage device is requested in the case where the state of charge of the auxiliary energy storage device is less than the sum of a minimum state of charge of the auxiliary energy storage device and of the load of the auxiliary energy storage device necessary to supply the electrical component.

According to one implementation, the recharging of the auxiliary energy storage device is inhibited in the case where the state of charge of the auxiliary energy storage device is greater than or equal to the sum of a state of minimum load of the auxiliary energy storage device and of the load of the auxiliary energy storage device necessary to supply the electrical component.

The invention also relates to an engine computer comprising a memory storing software instructions for the implementation of the method for controlling a recharge of the auxiliary energy storage device associated with an electrical member for a heat engine, in particular of a motor vehicle, as previously defined.

The invention also relates to a heat engine, in particular for a motor vehicle, comprising an engine computer as defined above.

The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given only by way of illustration but in no way limit the invention.

Figure 1 is a schematic representation of a thermal engine architecture implementing the method according to the invention for controlling the recharging of an auxiliary energy storage device;

Figure 2 is a schematic representation of the functional blocks used in the method according to the invention with an autonomous braking system;

Figure 3 is a schematic representation of the functional blocks used in the method according to the invention with a force feedback generator.

Figure 1 shows an architecture 10 of a motor vehicle comprising a primary energy storage device 12 connected to the on-board network of the vehicle able to be recharged by an alternator 14 rotated by the heat engine 16 via a device movement transmission, in particular with belt, mounted on the accessories front. In addition, an auxiliary energy storage device 18 is electrically connected to the primary energy storage device 12, in particular so that it can be recharged by this device 12.

The primary energy storage device 12 may take the form of a conventional battery, in particular lead. The auxiliary energy storage device 18 may take the form of a battery, in particular of the lithium-ion type, or of a capacitive device for maintaining on-board network voltage.

Capt_1-Capt_n sensors and Act_1-Act_m actuators of the vehicle are used by an autonomous braking system 20 of the motor vehicle. In addition, a force feedback generator 22 is provided for electric braking.

Described below, with reference to Figure 2, the method according to the invention for controlling a recharge of the auxiliary energy storage device 18 implemented with the autonomous braking system 20. This method may be implemented by an engine computer 24 comprising a memory storing software instructions allowing the performance of its various functions.

The Sel_capt_act_nec function for selecting the sensors and actuators required for the autonomous braking system 20 is described below. This Sel_capt_act_nec function receives the autonomous driving mode in urban traffic Mod_cir_urb as input.

The Sel_capt_act_nec function determines from the list of all the sensors and actuators present on the vehicle, which will be used to ensure the autonomous braking of the vehicle. For example, use may be made of position sensors, laser sights for vehicle spacing with other vehicles, etc.

The electrical consumers necessary for this functionality being known beforehand, this Sel_capt_act_nec function returns for each sensor / actuator in the list, a state (YES / NO) depending on whether the element will be used or not for carrying out the function of autonomous braking.

This determines the list of all the sensors / actuators of the vehicle to be processed: (Capt_1, Capt_2, ..., CaptJ, ..., Capt_n, Act_1, Act_2, ..., ActJ, .. ., Act_m).

If for example the consumers Capt_1, Capt_3, Capt_4, Capt_5, Act_2, Act_4 and Act_5 are the only ones identified as being necessary for the functioning of the autonomous braking system 20, then we will have:

Capt_1 = YES

Capt_3 = YES

Capt_4 = YES

Capt_5 = YES

Act_2 = YES

Act_4 = YES

Act_5 = YES

Capt_2 = NO

Capt_6 = NO

Capt_n = NO

Act_1 = NO

Act_3 = NO

Act_6 = NO

Act_m = NO The function Det_cons_fr_aut for determining electrical consumption for the autonomous braking system 20 is described below. This function Det_cons_fr_aut determines the electrical consumption to be considered, in the event of using the autonomous braking function of the vehicle. in urban traffic.

To this end, the Det_cons_fr_aut function adds the unit electrical consumption, associated with each consumer (sensor / actuator) having previously been identified by the Sel_capt_act_nec function as necessary (YES) for the operation of the autonomous braking system 20 of the vehicle, urban traffic.

Using the previous example with:

Capt_1 = YES

Capt_3 = YES

Capt_4 = YES

Capt_5 = YES

Act_2 = YES

Act_4 = YES

Act_5 = YES then the power consumption to be considered (l_cons_moy) is determined as follows:

l_cons_moy = l_cons_Capt_1 + l_cons_Capt_3 + l_cons_Capt_4 + l_cons_Capt_5 + I cons Act 2 + I cons Act 4 + I cons Act 5 with l_cons_Capt_i being the current consumed by sensor i and l_cons_ActJ being the current consumed by actuator j.

The Det_dur_roul_gar function for determining an autonomous driving time to be guaranteed is described below. This Det_dur_roul_gar function determines whether the primary energy storage device 12 is not in a particularly low state of charge, which can impact in particular priority functions such as starting the heat engine 16.

In this case, the recharging of the primary energy storage device 12 will have priority over that of the auxiliary energy storage device 18, for power supply requirements of the autonomous braking system 20, in urban traffic .

For this purpose, the Det_dur_roul_gar function compares the state of charge of the primary energy storage device 12 (SOC_Batt) to a minimum state of charge noted SOC_min_Batt for example between 30% and 50%.

The autonomous driving time to be guaranteed T_roul_gar, as a function of the autonomous driving time requested T_roul_dem for safety needs will therefore depend on the need or not to prioritize the supply of the primary energy storage device

12.

Thus, if the SOC_Batt state of charge of the primary energy storage device 12 is greater than the minimum charge level SOC_min_Batt, then the method is authorized to control the recharging of the auxiliary energy storage device 18, and the autonomous driving time to be guaranteed T_roul_gar will be the requested running time T_roul_dem (to secure autonomous braking, in the event of the incapacity of conventional means of energy production (alternator for example), to supply the autonomous braking management system 20 of the vehicle, in city traffic).

On the other hand, if the SOC_Batt state of charge of the primary energy storage device 12 is less than or equal to the minimum charge level SOC_min_Batt, then the method is not authorized to control the recharging of the storage device d auxiliary energy 18, and the autonomous driving time to be guaranteed T_rou_gar will be zero.

The function Det_ch_aux_gar for determining a load of the auxiliary energy storage device to be guaranteed for the autonomous braking system 20 is described below. This function Det_ch_aux_gar predicts the load of the auxiliary energy storage device 18 necessary (Ch_SOC_aux_nec) that will have to be provisioned, to be able to ensure independently (only with the auxiliary energy storage device 18) the supply of electrical energy related to the autonomous management of the vehicle braking, in urban traffic.

The Det_ch_aux_gar function notably uses the average consumed current l_cons_moy by the autonomous braking system 20, as well as the autonomous braking duration to be guaranteed T_roul_gar by the auxiliary energy storage device 18.

[0041] Thus, the information Ch_SOC_aux_nec is determined using the relationship below:

Ch_SOC_aux_nec = (l_cons_moy * T_roul_gar * 100) / (3600 * C_stock)

- C_stock being a capacity of the auxiliary energy storage device 18 (expressed in A.h).

We describe below the Pilalimals function of controlling a recharge of the auxiliary energy storage device 18 to be able to supply the autonomous braking system 20. The purpose of this function of Pil supply is to control preventively, charging the auxiliary energy storage device 18, in order to anticipate any future power supply needs autonomously (only by the auxiliary energy storage device 18), of the autonomous braking system 20, in urban traffic conditions.

The Pil power supply function manages the recharging requests of the auxiliary energy storage device 18, to ensure preventively having the electrical energy necessary to supply the autonomous braking system 20, in the case where the saturation of the conventional energy production means of the vehicle (for example the alternator) would require maintaining the supply of this system, only by the auxiliary energy storage device 18, for a given period, linked to security needs (control of vehicle braking being a security element).

To this end, the Pil power supply function compares the state of charge of the auxiliary energy storage device 18 (SOC_stock_aux), the minimum charge to be observed (SOC_aux_min) of the auxiliary energy storage device 18 for needs related in particular to its durability and to the possible supply of other electrical consumers, as well as the necessary load Ch_SOC_aux_nec to ensure the electrical supply of the autonomous braking system 20. The minimum state of charge SOC_aux_min could for example be between 50% and 70%.

The recharging of the auxiliary energy storage device 18 is inhibited in the case where the state of charge SOC_stock_aux of the auxiliary energy storage device 18 is greater than or equal to the sum of the minimum state of charge SOC_aux_min of the auxiliary energy storage device 18 and of the load of the necessary auxiliary energy storage device Ch_SOC_aux_nec to supply the autonomous braking system 20. The state of the auxiliary energy storage device 18 is then defined as compliant ( OK) and the signal relating to the authorization to recharge the auxiliary energy storage device Aut_pil_alim_aux takes the following state: Aut_pil_alim_aux = NO REQUEST.

Conversely, the recharging of the auxiliary energy storage device 18 is requested in the case where the state of charge SOC_stock_aux of the auxiliary energy storage device 18 is less than the sum of the state of SOC_aux_min minimum load of the auxiliary energy storage device 18 and of the load of the auxiliary energy storage device required Ch_SOC_aux_nec to supply the autonomous braking system 20. The state of the auxiliary energy storage device 18 is then defined as non-compliant (NOK) and the signal relating to the authorization to recharge the auxiliary energy storage device Aut_pil_alim_aux takes the following state: Aut_pil_alim_aux = REQUEST.

Described below, with reference to Figure 3, the method according to the invention for controlling a recharge of the auxiliary energy storage device 18 implemented with the brake force feedback generator 22. This process could be implemented by an engine computer 24 comprising a memory storing software instructions allowing the performance of its various functions.

We describe below the Det_cont_eff_A function for determining energy constraints of a first law A of braking force feedback. This function Det_cont_eff_A determines the electric charge (in Ampere hours or A.h) necessary Ch_nec_A at the level of the auxiliary energy storage device 18, when using the first law A of braking force feedback.

For this purpose, the Det_cont_eff_A function takes into account the current consumed l_cons_A (on average and expressed in Amperes) when using the A law of braking force feedback as well as the minimum duration (in Hours) of use of law A to guarantee TminA for security needs.

The information Ch_nec_A is thus determined from the relation below: Ch_nec_A = l_cons_A * TminA [0151] The function Det_cont_eff_B for determining the energy constraints of a second law B of return is described below. braking force. This function Det_cont_eff_B determines the electric charge (in Ampere hours or A.h) necessary Ch_nec_B at the level of the auxiliary energy storage device 18, when using the second law B of braking force feedback.

To this end, the Det_cont_eff_B function uses the current consumed l_cons_B (on average and expressed in Amperes) when the law B of braking force feedback is used as well as the minimum duration (in Hours) of use of law B to guarantee TminB for security needs.

The information Ch_nec_B is determined from the relationship below: Ch_nec_B = l_cons_B * T min B [0054] The function Ch_nec_alim_gen for predicting the load of the auxiliary energy storage device 18 is described below. necessary to supply the brake force feedback generator 22.

This function Ch_nec_alim_gen predicts the charge of the necessary auxiliary energy storage device (Ch_SOC_aux_nec) which will have to be provisioned, in order to be able to ensure autonomously (that is to say only with the device for auxiliary energy storage 18) the supply of electrical energy linked to the use of the brake force feedback generator 22.

For this purpose, the function Ch_nec_alim_gen uses for this the necessary electric charge Ch_nec_A associated with the use of the first law A and the necessary electric charge Ch_nec_B associated with the use of the second law B. We will consider the maximum value (MAX) of the electrical charges linked respectively to laws A and B to determine the necessary charge Ch_SOC_aux_nec which must be provisioned by the auxiliary energy storage device 18.

[0057] Thus, the information Ch_SOC_aux_nec is determined using the relationship below:

Ch_SOC_aux_nec = (MAX (Ch_nec_A, Ch_nec_B) * 100) / (3600 * C_stock)

- C_stock being the capacity of the auxiliary energy storage device 18 (expressed in A.h).

The following describes the pilalimals function for controlling a recharge of the auxiliary energy storage device 18 so as to be able to supply power to the electric braking force feedback generator 22. This function Pil supply to the for objective to pilot preventively, the SOC_stock_aux load of the auxiliary energy storage device 18, in order to anticipate the possible future supply needs independently (only by the auxiliary energy storage device 18) of the return generator braking force 22.

The Pil power supply function determines the state of the auxiliary energy storage device Et_stock_aux, as a function of its capacity to supply the necessary energy during a future autonomous supply phase of the brake force feedback generator. 22.

To this end, the Pil power supply function compares the state of charge of the auxiliary energy storage device (SOC_stock_aux), the minimum charge to be observed of the device 18 (SOC_aux_min) for needs related in particular to its durability and the possible supply of other electrical consumers, as well as the load necessary for the electrical supply of the brake force feedback generator 22 (Ch_SOC_aux_nec). The minimum charge SOC_aux_min is for example between 50% and 70%.

The recharging of the auxiliary energy storage device 18 is inhibited in the case where the state of charge SOC_stock_aux of the auxiliary energy storage device 18 is greater than or equal to the sum of the minimum state of charge SOC_aux_min of the auxiliary energy storage device 18 and of the load of the necessary auxiliary energy storage device Ch_SOC_aux_nec to supply the brake force feedback generator 22. The state Et_stock_aux of the auxiliary energy storage device 18 is then defined as compliant (OK) and the signal relating to the authorization to recharge the auxiliary storage device Aut_pil_alim_aux takes the following state: Aut_pil_alim_aux = NO REQUEST.

Conversely, the recharging of the auxiliary energy storage device 18 is requested in the case where the state of charge SOC_stock_aux of the auxiliary energy storage device 18 is less than the sum of the state of SOC_aux_min minimum load of the auxiliary energy storage device 18 and of the load of the auxiliary energy storage device required Ch_SOC_aux_nec to supply the brake force feedback generator 22. The state Et_stock_aux of the energy storage device auxiliary 18 5 is then defined as non-compliant (NOK) and the signal relating to the authorization to recharge the auxiliary storage device Aut_pil_alim_aux takes the following state: Aut_pil_alim_aux = REQUEST.

Claims (10)

Claims: 1. A method of controlling a recharge of an auxiliary energy storage device (18) associated with an electrical member (20, 22) for a heat engine (16), in particular of a motor vehicle, characterized in that said method includes: a step for evaluating a state of charge (SOC_stock_aux) of an auxiliary energy storage device (18), a step of determining a charge of the auxiliary energy storage device necessary (Ch_SOC_aux_nec) to supply the electrical member (20, 22), and - a piloting step (Pilalimaux) of recharging the auxiliary energy storage device (18) according to the evaluation of the state of charge (SOC_stock_aux) of the auxiliary energy storage device (18) and charging the necessary auxiliary energy storage device (Ch_SOC_aux_nec) to supply the electrical component (20, 22). 2. Method according to claim 1, characterized in that the electrical member is an autonomous braking system (20) or a brake force feedback generator (22). 3. Method according to claim 2, characterized in that, in the case where the electrical component is an autonomous braking system (20), the load of the necessary auxiliary energy storage device (Ch_SOC_aux_nec) for its supply is determined as a function of an autonomous driving time to be guaranteed (T_roul_gar) and an average consumed current (l_cons_moy) during an autonomous braking phase. 4. Method according to claim 3, characterized in that the autonomous driving time to be guaranteed (T_roul_gar) is determined from a state of charge (S0C_E3att) of a primary energy storage device (12) and d 'a requested autonomous driving time (T_roul_dem). 5. Method according to claim 3 or 4, characterized in that the average consumed current (l_cons_moy) during an autonomous braking phase is determined from a consumption of identified sensors (Capt_n) and actuators (Act_m) to perform the autonomous braking phase. 6. Method according to claim 2, characterized in that, in the case where the electrical member is a brake force return generator (22), the load of the necessary auxiliary energy storage device (Ch_SOC_aux_nec) for its power supply is determined from a necessary electric charge (Ch_nec_A) when using a first braking force feedback law and a necessary electric charge (Ch_nec_B) when using a second braking force feedback law. 7. Method according to claim 6, characterized in that the load of the necessary auxiliary energy storage device (Ch_SOC_aux_nec) for its supply is determined by considering a maximum value of the electrical charges required (Ch_nec_A, Ch_nec_B) in case of use of the first braking force feedback law or of the second braking force feedback law. 8. Method according to claim 6 or 7, characterized in that the necessary electric charge (Ch_nec_A, Ch_nec_B) when using a braking force feedback law is determined from a consumed current (l_cons_A , l_cons_B) and a minimum duration of use to be guaranteed (TminA, T min B) for security needs. 9. Method according to any one of claims 1 to 8, characterized in that the recharging of the auxiliary energy storage device is requested in the case where the state of charge (SOC_stock_aux) of the auxiliary energy storage device (18) is less than the sum of a minimum state of charge (SOC_aux_min) of the auxiliary energy storage device (18) and of the charge of the auxiliary energy storage device necessary (Ch_SOC_aux_nec) to supply the organ electric (20, 22). 10. Method according to any one of claims 1 to 9, characterized in that the recharging of the auxiliary energy storage device is inhibited in the case where the state of charge (SOC_stock_aux) of the auxiliary energy storage device (18) is greater than or equal to the sum of a minimum state of charge (SOC_aux_min) of the auxiliary energy storage device (18) and of the charge of the auxiliary energy storage device necessary (Ch_SOC_aux_nec) to supply l electric organ (20, 22).