BATTERY-DRIVEN MOTOR VEHICLE COMPRISING A MULTIPLEXED CONNECTED ELECTRICAL CONSUMER CONTROL, METHOD AND PROGRAM BASED ON SUCH A VEHICLE

Abstract

The invention relates to a motor vehicle comprising an electrical circuit which comprises a traction battery, and an electrical consumer connected in a multiplexed network, characterized in that the motor vehicle further comprises an activation means activating (A) or deactivating (NA) the electrical consumer according to criteria (C1) of closed battery contacts, charge state threshold, charge energy transfer state, vehicle ignition, depending on charge connection situations, and current driving. The invention also relates to a method and a program based on such a vehicle. Figure 1

Description

Title of the invention: BATTERY-POWERED MOTOR VEHICLE INCLUDING A CONSUMER CONTROL MULTIPLEXED CONNECTED ELECTRIC VEHICLE, METHOD AND PROGRAM BASED ON SUCH A VEHICLE

[0001] The invention relates to the field of electrical circuit architectures of motor vehicles with traction batteries, as well as controls of electrical consumers of these architectures.

[0002] These architectures generally comprise a high-voltage electrical circuit connected to the traction battery. The electrical circuit comprises at least one so-called high-voltage electrical consumer, which communicates only in read mode with a multiplexed network of the vehicle. This type of consumer does not communicate with the vehicle's computers.

[0003] Managing this type of consumer poses difficulties.

[0004] An objective of the present invention is to remedy the defects of the prior art, and in particular to propose an optimal management strategy for the electrical consumer in a multiplexed network.

[0005] To achieve this objective, the invention proposes a motor vehicle comprising an electrical circuit which comprises a traction battery, and an electrical consumer connected in a multiplexed network, characterized in that the motor vehicle further comprises an activation means activating or deactivating the electrical consumer according to criteria of closed battery contactors, charge state threshold, charge energy transfer state, vehicle ignition, depending on charge connection situations, and current driving.

[0006] By "charging connection" or "charging in connection" is meant an electrical connection of the battery to an external current source so as to allow the battery to be charged. We can speak of "Plug-In" in English.

[0007] Advantageously, the invention proposes a solution for optimal management of a high-voltage electrical consumer. The invention also makes it possible to ensure the durability of the contactors of the high-voltage battery, in particular by avoiding activation when the contactors are open or in the pre-charging phase, and by avoiding opening of the contactors under load when they are closed.

[0008] According to a variant, the activation means is configured so that in a driving situation, the activation means activates the consumer if the contactors are closed. during a first calibratable time and the state of charge of the battery is greater than a first state of charge threshold; otherwise the activation means deactivates the consumer.

[0009] This allows for optimal control in a driving situation, ensuring that there is sufficient electrical energy for vehicle traction. This also avoids disrupting the activation sequence.

[0010] According to a variant, the activation means is configured so that in a load connection situation, the activation means activates the consumer if the load connection is effective and there is a transfer of electrical load energy for a second calibratable time, and if the state of charge of the battery is greater than a second threshold or the first threshold; otherwise the activation means deactivates the consumer.

[0011] This allows for optimal control in load connection situations.

[0012] According to a variant, the activation means is configured so that in a load connection situation, the activation means activates the consumer if, in addition, the state of charge of the battery is between a maximum state of charge value and a minimum value corresponding to the second threshold or the first threshold.

[0013] This makes it possible to calibrate a range of consumer activation load states in a load connection situation.

[0014] According to a variant, the activation means is configured so that in the end of driving or end of charging situation in connection, the activation means activates the consumer if a contact of the vehicle is cut or if the load is connected without need for charging, the battery contactors are closed, and there is a current draw; otherwise the activation means deactivates the consumer.

[0015] This allows for optimal control in the end-of-driving or end-of-charge connection situation.

[0016] According to a variant, the motor vehicle further comprises an electric machine and a charging system, and the activation means activates the consumer if, in addition, the state of charge corresponds to the following equations: çz^^DropPied / çf^f-fThdPostDrv,^^ — C5VÆ'consumption ['J'-'1- HVB Ud jOL- jivb > J with : • the minimum state of charge of the battery, at which the contactors can be maintained without risk of deep discharge of the battery; pH V EtComurners _ 'MwMax SOC^ygl>>'iDrVMin- the minimum predicted state of charge of the battery at which the battery contacts are allowed to be maintained without the risk of deep discharge of the battery; soc^B: actual state of charge of the battery; SCX^vb • the predicted state of charge of the battery and it is calculated as follows: max ( LPFTs ( IPHVB - PEiMch - Pciu-enSys I ) ) ; when the contactors are closed Movin^ v । “ k 0 ; when the contactors are open with Phvb: the instantaneous power of the battery; ^ElMch: the instantaneous power of the electrical machine; PchrgnSys- the instantaneous power of the load system; and LFPts: a low-pass filter with a filtering time Ts, otherwise the activation means deactivates the consumer.

[0017] This makes it possible to specify the conditions for activating and deactivating the consumer.

[0018] The invention further relates to a method for controlling an electrical consumer of a motor vehicle according to the invention, comprising activation steps in which the electrical consumer is activated or deactivated according to criteria of closed battery contactors, charge state threshold, charge energy transfer state, vehicle ignition, depending on charge connection situations, and current driving.

[0019] Another object of the invention relates to a computer program comprising program code instructions for executing the steps of the load demand control method according to the invention, when said program operates on a computer.

[0020] The invention will be further detailed by the description of non-limiting embodiments, and on the basis of the appended [Fig.l] which schematically illustrates the implementation of a means of activating a motor vehicle according to an embodiment of the invention.

[0021] The invention proposes a control strategy for managing an electrical consumer on the high voltage side, such as a power take-off device (or "Electric Power Take-Off" in English or abbreviated ePTO) like the Thermoking El000 reference refrigerant, which does not communicate with the computers of the hybrid or electric vehicle.

[0022] The computer of this high-voltage consumer is only in read mode on the vehicle's multiplexed network, the CAN network.

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032] The strategy proposed in the invention allows the management of activations / deactivations in all circumstances of use. The objective of the invention is to propose optimal management of an electrical consumer, and to ensure the durability of the contactors of the traction battery, in particular to avoid activation when the contactors are open or in the pre-charge phase, and to avoid opening under load of the contactors when they are closed. This strategy illustrated in [Fig.l], allows the management of activations / deactivations in all situations. We construct an authorization signal for activation / deactivation of the ePTO electrical consumer which will have two states: - deactivation: the NA prohibition of the activation of the ePTO consumer; - activation: authorization A for activation of the ePTO electrical consumer. In [Fig.l], Cl groups together the conditions to be checked to activate A or deactivate NA the electrical consumer. In a driving situation, activation is authorized A when the contacts are closed for a first calibrable time and the state of charge of the battery is greater than a calibrable value noted by a first state threshold of charge. Otherwise, NA prohibits the activation of the electrical consumer to ensure that there is sufficient electrical energy for vehicle traction if the battery state of charge is below the first threshold This also helps to avoid disrupting the activation sequence. For example, activating the ePTO consumer during the pre-charge phase may slow down or disrupt this pre-charge process, and this leads to a risk of failure to close the traction battery contactors. In a charging connection situation (called "Plug-In" in English), activation is authorized A when in charging connection and in transfer of charging electrical energy (i.e. with an on-board charger in mode 2 or 3, or a charging station in mode 4, in supply of electrical energy) during a second calibrated time and if the state of charge of the battery is between a maximum state of charge value noted S0C™BlMæt and a minimum value corresponding to the first threshold SOC^yQ^"' Otherwise, NA prohibits the activation of the electrical consumer. In the end of driving or end of charging situation in connection, activation can be authorized A when the ignition is switched off, for example with the key moving to the extinction position (key OFF in English).

[0033] Activation can be authorized A when the load is connected without need for charging, and the battery contactors are closed and there is a need to keep the contactors closed (for a thermal need for example: passenger compartment pre-conditioning or cooling of the battery after driving or recharging of the vehicle in load connection).

[0034] Furthermore, the state of charge corresponds to the following equation: ( ç^f-iThdPostDn'^, e / ^kr-'Pred . \ with : SOCTH~^ • the minimum state of charge of the battery for which the contactors can be maintained without risk of deep discharge of the battery; the predicted minimum state of charge of the battery which is authorized to be maintaining battery contacts without risk of deep battery discharge; soc^B: actual state of charge of the battery; SCXZhvb • the predicted state of charge of the battery and it is calculated as follows: max ( LPFTs ( IPHVB - PElMch - PchmiSys I ) ) ; when the contactors are closed nHVElConsumers _ . *MwMax — 0 ; when the contactors are open with P h vu: the instantaneous power of the battery; ^EiMeh: the instantaneous power of the electric machine; PchrgnSys- the instantaneous power of the charging system machine (charger or charging station); and LFPTs: a low-pass filter with a filtering time Ts.

[0035] The maximum sliding power Vr of HV electrical consumers is calculated based on Phvb, ^EiMch, PchrgnSys and LFPTs; and also on the following parameters:

[0036] o^-^DropPredicted _ P^Æx^^Predicted. ^f^-consitinpnon — gH'Oî with : TPredicted: a maximum time for deactivation of the electrical consumer (ePTO); and : the maximum battery energy.

[0037] Then: Ç(qCPred - qryf'Real ^QpüropPred LJ — ^^"-'consumption

[0038] Otherwise, NA prohibits the activation of the electrical consumer.

[0039] This method can be used for any electrical consumers that communicate with the vehicle's computers only in read mode.

[0040] The invention further relates to a program for implementing a method as described above. The program can be loaded into the memory of a controller of the motor vehicle, for example in a controller of the electrical consumer.

Claims

Claims

1. Motor vehicle comprising an electrical circuit which comprises a traction battery, and an electrical consumer connected in a multiplexed network, characterized in that the motor vehicle further comprises an activation means activating (A) or deactivating (NA) the electrical consumer according to criteria (Cl) of closed battery contactors, charge state threshold, charge energy transfer state, vehicle ignition, depending on charge connection situations, and current driving.

2. Motor vehicle according to claim 1, characterized in that the activation means is configured so that in a driving situation, the activation means activates (A) the consumer if the contactors are closed for a first calibrated time and the state of charge of the battery is greater than a first state of charge threshold; otherwise the activation means deactivates (NA) the consumer.

3. Motor vehicle according to claim 2, characterized in that the activation means is configured so that in a charging connection situation, the activation means activates (A) the consumer if the charging connection is effective and there is a transfer of electrical charging energy for a second calibratable time, and if the state of charge of the battery is greater than a second threshold or the first threshold; otherwise the activation means deactivates (NA) the consumer.

4. Motor vehicle according to claim 3, characterized in that the activation means is configured so that in a charging connection situation, the activation means activates (A) the consumer if, in addition, the state of charge of the battery is between a maximum state of charge value and a minimum value corresponding to the second threshold or the first threshold.

5. Motor vehicle according to any one of claims 1 to 4, characterized in that the activation means is configured so that in the end of driving or end of charging situation in connection, the activation means activates (A) the consumer if a contact of the vehicle is cut or if the load is connected without need for charging, the battery contactors are closed, and there is a current draw; otherwise the activation means deactivates (NA) the consumer.

6. Method for controlling an electrical consumer of a motor vehicle according to any one of claims 1 to 5, comprising activation steps in which the electrical consumer is activated (A) or deactivated (NA) according to criteria (Cl) of closed battery contacts, charge state threshold, charge energy transfer state, vehicle ignition, depending on charge connection situations, and current driving.

7. A computer program comprising program code instructions for executing the steps of the control method according to claim 6, when said program is running on a computer.

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