Vehicle charging method, device, vehicle, storage medium and program product

Abstract

The present disclosure relates to a vehicle charging method, device, vehicle, storage medium and program product, which relates to the field of vehicle technology and can reduce the heating temperature of the motor rotor on the vehicle. The method includes: obtaining the battery voltage of the vehicle; determining a target charging voltage in a voltage interval according to the battery voltage to suppress the ripple current of the vehicle during the charging process, wherein the voltage interval represents the interval of the input voltage of the vehicle during the charging process; and sending a charging request including the target charging voltage to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a vehicle charging method, device, vehicle, storage medium, and program product. Background Art

[0002] In the scenario where the vehicle adopts the staggered-phase control mode for boost charging, the vehicle generally requests the charging pile to output a voltage close to the maximum output capacity of the charging pile. However, the motor of the boost system (such as the electric drive system) installed on the vehicle will generate eddy current losses, causing the motor rotor to heat up. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a vehicle charging method, device, vehicle, storage medium and program product.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a vehicle charging method, comprising:

[0005] Get the battery voltage of the vehicle;

[0006] Determining a target charging voltage in a voltage interval according to the battery voltage to suppress a ripple current of the vehicle during charging, wherein the voltage interval represents an interval of an input voltage of the vehicle during charging;

[0007] A charging request including the target charging voltage is sent to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0008] According to a second aspect of an embodiment of the present disclosure, there is provided a vehicle charging device, comprising:

[0009] An acquisition module configured to acquire a battery voltage of a vehicle;

[0010] a determination module configured to determine a target charging voltage in a voltage interval according to the battery voltage to suppress a ripple current of the vehicle during charging, wherein the voltage interval represents an interval of an input voltage of the vehicle during charging;

[0011] The execution module is configured to send a charging request including the target charging voltage to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0012] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising:

[0013] a first processor;

[0014] a first memory for storing processor executable instructions;

[0015] Wherein, the first processor is configured as follows:

[0016] Get the battery voltage of the vehicle;

[0017] Determining a target charging voltage in a voltage interval according to the battery voltage to suppress a ripple current of the vehicle during charging, wherein the voltage interval represents an interval of an input voltage of the vehicle during charging;

[0018] A charging request including the target charging voltage is sent to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0019] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method described in the first aspect is implemented.

[0020] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, including a computer program, which implements the method described in the first aspect when executed by a processor.

[0021] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: according to the battery voltage of the vehicle, the target charging pile for charging the vehicle is controlled to dynamically adjust the output voltage, thereby suppressing the ripple current of the vehicle during the charging process. Since the magnetic flux density of the motor rotor on the vehicle is positively correlated with the magnitude of the ripple current, the magnetic flux density of the motor rotor on the vehicle can be simultaneously reduced by controlling the target charging pile to dynamically adjust the output voltage to suppress the ripple current during the charging process of the vehicle, so as to reduce the eddy current loss of the motor rotor, thereby reducing the heating temperature of the motor rotor and extending the life of the motor.

[0022] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0024] Figure 1 It is a schematic diagram of the vehicle charging method.

[0025] Figure 2 This is a circuit diagram for boost charging of a vehicle.

[0026] Figure 3 It is a schematic diagram of the fluctuation of ripple current during vehicle charging.

[0027] Figure 4The figure is a flow chart of a vehicle charging method according to an exemplary embodiment.

[0028] Figure 5 is a diagram showing the relationship between the ripple current and the charging current of a vehicle under three different battery voltages according to an exemplary embodiment.

[0029] Figure 6 4 is a schematic diagram showing an adjustment direction of a charging voltage when limiting a ripple current according to an exemplary embodiment.

[0030] Figure 7 is another flow chart of a vehicle charging method according to an exemplary embodiment.

[0031] Figure 8 is a flow chart showing a method for determining a target charging voltage according to an exemplary embodiment.

[0032] Fig. 9 is a diagram showing the relationship between the ripple current and the charging current of a vehicle under six different battery voltages according to an exemplary embodiment.

[0033] Fig.10 is another flow chart of a vehicle charging method according to an exemplary embodiment.

[0034] Fig.11 is a block diagram of a vehicle charging device according to an exemplary embodiment.

[0035] Fig.12 is a block diagram of a vehicle according to an exemplary embodiment.

[0036] Fig.13 is a block diagram of a chip system according to an exemplary embodiment. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0038] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0039] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0040] It should be understood that with the development of new energy vehicles, the battery voltage of vehicles is getting higher and higher, which increases the energy storage capacity of batteries. However, the charging piles as infrastructure are updated lagging behind, resulting in a certain proportion of charging piles corresponding to the battery voltage of early vehicles on the market. For example, the battery voltage of vehicles has increased from 500V in the early days to 750V, and even to 1000V, but there are still a certain proportion of 500V charging piles on the market. This type of charging pile cannot charge vehicles with a voltage level greater than its voltage level. It is necessary to boost the voltage output by the charging pile through an external boost system to charge the vehicle, that is, boost charging. For example, a 500V charging pile cannot directly charge a vehicle with a battery voltage of 750V or 1000V. It is necessary to boost the voltage output by the charging pile through an additional boost system to charge a vehicle with a battery voltage of 750V or 1000V.

[0041] Among them, the boost system realizes boost charging by reusing the motor windings and the motor controller. During the charging process, the motor controller has two control modes: in-phase and out-of-phase. However, when in-phase control is used, the fluctuation range of the ripple current of the vehicle during the charging process is large, which will cause the ripple current flowing into the charging pile to exceed the ripple current tolerance of the charging pile, resulting in charging failure. An external boost inductor is required to suppress the ripple current of the vehicle during the charging process, which will increase the size of the vehicle and increase the charging cost, reducing the competitiveness of the boost system. When out-of-phase control is used, although no external boost inductor is required, the synthetic magnetomotive force of the reused motor winding is not zero, which will cause eddy current loss in the motor, thereby causing the motor rotor to heat up.

[0042] It should be understood that there are three charging scenarios between the charging pile and the vehicle, depending on the type and voltage level of the charging pile: Figure 1 As shown:

[0043] The first charging scenario: when the charging pile 1 is an AC charging pile, the charging pile 1 is used together with the vehicle charger 4 to charge the battery on the vehicle.

[0044] For example, the charging pile 1 is a 220V AC charging pile. After the charging pile 1 shakes hands with the vehicle, the charging pile 1 outputs AC power to the on-board charger 4, and the on-board charger 4 converts the AC power into DC power and charges the battery.

[0045] The second charging scenario: When charging pile 1 is a DC charging pile and the voltage level of charging pile 1 is greater than or equal to the voltage level of the battery on the vehicle, charging pile 1 directly charges the battery through wire 2.

[0046] For example, the charging pile 1 is a DC charging pile with a voltage level of 750V, and the voltage level of the battery on the vehicle is 500V. After the charging pile 1 shakes hands with the vehicle, the charging pile 1 outputs DC power to directly charge the battery through the wire 2 on the vehicle.

[0047] The third charging scenario: When charging pile 1 is a DC charging pile and the voltage level of charging pile 1 is lower than the voltage level of the battery on the vehicle, charging pile 1 is combined with the electric drive system to charge the battery on the vehicle.

[0048] For example, charging pile 1 is a DC charging pile with a voltage level of 500V, and the voltage level of the battery on the vehicle is 800V. After the charging pile 1 shakes hands with the vehicle, the charging pile 1 outputs DC power to the electric drive system on the vehicle. The electric drive system boosts the DC power and charges the battery with the boosted DC power.

[0049] It should be noted that for the third charging scenario, the principle of the electric drive system boosting the DC power output by the charging pile is as follows:

[0050] like Figure 2 As shown, the first end of the DC charging pile is connected to the neutral point Y of the motor in the electric drive system, and the second end of the DC charging pile is connected to the negative pole of the battery through the output end of the main relay. In the electric drive system, the neutral point Y of the motor is connected to the equivalent winding of the motor, and the equivalent winding of the motor is connected to the three-phase bridge drive circuit. The three-phase bridge drive circuit is connected to the positive pole of the battery through the input end of the main relay, and the input end of the main relay is connected in parallel with a pre-charge relay. In the electric drive system, a boost circuit is formed by the neutral point Y of the motor and the output end of the electric drive system. When the MOS tube U2, MOS tube V2 and MOS tube W2 in the three-phase bridge drive circuit are all turned on, the DC charging pile stores energy for the motor inductance; when the MOS tube U1, MOS tube V1 and MOS tube W1 in the three-phase bridge drive circuit are all turned on, the DC charging pile and the motor inductance that has stored energy are connected in series to discharge the battery to achieve boost charging. The above functions can also be achieved by forming a boost circuit through the neutral point Y of the motor and the input end of the electric drive system.

[0051] like Figure 3 As shown in the figure, since the DC charging pile has a limit on the ripple current flowing in, the three-phase bridge arms of the three-phase bridge drive circuit in the electric drive system adopt a control method of staggering 120° with each other, thereby reducing the ripple current of the motor neutral point Y, and then reducing the ripple current flowing into the DC charging pile. At the same time, in order to reduce the input current of the DC charging pile, the DC charging pile is usually requested to output a voltage close to the maximum output capacity, such as a 500V charging pile outputting a voltage of 450V~470V. When the electric drive system is under staggered phase control, the motor's synthetic magnetomotive force is not zero, and eddy current loss is generated, causing the motor rotor to heat up, thereby affecting the motor life.

[0052] In view of this, the present disclosure provides a vehicle charging method, device, vehicle, storage medium and program product, which control the charging pile to dynamically adjust the output voltage according to the battery voltage of the vehicle, suppress the ripple current during the vehicle charging process to reduce eddy current loss, thereby reducing the heating temperature of the motor rotor and extending the life of the motor.

[0053] Figure 4 is a flow chart of a vehicle charging method according to an exemplary embodiment. Figure 4 As shown, the vehicle charging method is used in electric vehicles, such as pure electric vehicles and hybrid vehicles. The vehicle charging method may include the following steps.

[0054] In step S11 , the battery voltage of the vehicle is acquired.

[0055] It is worth noting that during the vehicle boost charging process, the battery voltage of the vehicle increases as the charging time increases.

[0056] In step S12, a target charging voltage is determined in a voltage interval according to the battery voltage to suppress the ripple current of the vehicle during the charging process, and the voltage interval represents the interval of the input voltage of the vehicle during the charging process.

[0057] It is worth noting that the target charging pile in the embodiment of the present disclosure is a DC charging pile, and the voltage level of the target charging pile is lower than the voltage level of the battery on the vehicle. That is, the vehicle charging method in the embodiment of the present disclosure is mainly applied to the third charging scenario mentioned above.

[0058] In step S13, a charging request including a target charging voltage is sent to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0059] It should be understood that in the embodiments of the present disclosure, the battery voltage may be acquired through the vehicle control unit (VCU) of the vehicle, and a charging request including a target charging voltage may be sent to a target charging pile through the VCU.

[0060] It is worth noting that the calculation formula for the motor rotor eddy current loss is as follows:

[0061] ,

[0062] Among them, P e Characterizes the motor rotor eddy current loss, K e Characteristic eddy current coefficient, B m It represents the maximum value of magnetic flux density, t represents the thickness of motor rotor laminations, f represents the frequency of change of magnetic field, and V represents the volume of magnetic material.

[0063] According to the above eddy current loss calculation formula, reducing the magnetic flux density B m Can reduce the motor rotor eddy current loss P e . Because the magnetic flux density B m It is positively correlated with the ripple current, so the magnetic flux density B can be reduced by suppressing the ripple current. m , thereby reducing the motor rotor eddy current loss P e .

[0064] In the disclosed embodiment, the target charging pile is controlled according to the vehicle battery voltage to dynamically adjust the output voltage, and the vehicle is boosted and charged, thereby suppressing the ripple current of the vehicle during the charging process. Since the magnetic flux density of the motor rotor on the vehicle is positively correlated with the magnitude of the ripple current, the magnetic flux density of the motor rotor can be simultaneously reduced by suppressing the ripple current during the vehicle charging process, so as to reduce the eddy current loss of the motor rotor, thereby reducing the heating temperature of the motor rotor, improving the boost charging power, and extending the life of the motor.

[0065] In order to facilitate those skilled in the art to better understand the above vehicle charging method, the method is described in detail below.

[0066] In a feasible implementation manner, the voltage interval may be determined in the following manner:

[0067] Determine the target charging power of the vehicle and the voltage level of the target charging pile;

[0068] Determine the minimum charging voltage of the vehicle according to the target charging power;

[0069] Determine the maximum charging voltage of the vehicle according to the voltage level;

[0070] Determine the voltage range based on the minimum charging voltage and the maximum charging voltage.

[0071] It should be understood that in the embodiments of the present disclosure, after the vehicle shakes hands with the target charging pile, the voltage level of the target charging pile can be obtained through the VCU of the vehicle.

[0072] It is worth noting that the target charging power of the vehicle and the maximum charging current of the charging pile are determined, and the minimum charging voltage of the vehicle is determined based on the target charging power and the maximum charging current. The maximum charging voltage of the vehicle is less than the voltage level of the target charging pile and is close to the voltage level of the target charging pile. Among them, the minimum charging voltage of the vehicle is the same as the minimum voltage output by the charging pile, the maximum charging voltage of the vehicle is the same as the maximum voltage output by the charging pile, and the voltage range of the vehicle is the adjustment range of the output voltage of the charging pile.

[0073] For example, when the target charging power P of the vehicle is 75kW, the maximum output current I of the target charging pile for charging the vehicle is 250A, and the voltage level is 500V, the minimum charging voltage of the vehicle is a=P / I=75kW / 250A=300V, the maximum charging voltage of the vehicle is b=470V, and the voltage interval [a, b] is determined to be [300V, 470V]. Accordingly, the adjustment range of the output voltage of the target charging pile is [300V, 470V].

[0074] It is worth noting that in the embodiments of the present disclosure, the target charging voltage can be determined in two ways: Method 1: Determine the target charging voltage based on the battery voltage and the two end voltages of the voltage interval. Method 2: Determine the target charging voltage based on the battery voltage and the preset mapping relationship between the ripple current and the charging voltage. Both methods can determine the voltage corresponding to the minimum ripple current in the voltage interval.

[0075] In a feasible implementation, in step S12, determining the target charging voltage in the voltage interval according to the battery voltage may include:

[0076] Determine the target charging voltage in the voltage interval according to the magnitude relationship between the first sum value and the battery voltage, wherein the first sum value is the sum of the maximum voltage and the minimum voltage in the voltage interval;

[0077] or,

[0078] According to the battery voltage, a target mapping relationship is determined among multiple preset mapping relationships between ripple current and charging voltage, and according to the target mapping relationship, a target charging voltage is determined in the voltage range, wherein one battery voltage corresponds to one preset mapping relationship.

[0079] It is worth noting that the charging voltage of the vehicle is the output voltage of the charging pile for charging the vehicle. Therefore, the preset mapping relationship between the ripple current corresponding to the battery voltage and the charging voltage may include the following calculation formula:

[0080] ,

[0081] Among them, ΔiL represents the ripple current of the vehicle, Vo_charger represents the output voltage of the charging pile (equivalent to the charging voltage of the vehicle), Ubat represents the battery voltage of the vehicle, L represents the stator inductance of the motor on the vehicle, and f s Characterizes the boost charging switching frequency.

[0082] like Figure 5As shown in the figure, when Ubat is equal to 600V, 700V and 880V respectively, three corresponding mapping curves can be obtained, that is, the ripple current and the output voltage of the charging pile are in a downward-opening parabolic relationship. For each parabola, when the output voltage of the charging pile is Vo_charger=1 / 2·Ubat, the ripple current ΔiL takes the maximum value, so the ripple current can be suppressed by adjusting the output voltage of the charging pile.

[0083] like Figure 6 As shown in the figure, in order to take into account the requirements of minimum ripple current and maximum output voltage of the charging pile, the output voltage of the charging pile can be set as far as possible to the right of the parabola, such as setting it to Figure 6 The value of b in the medium voltage range. And due to the limitation of the maximum output voltage of the charging pile, during the charging process, the ripple current corresponding to the maximum voltage in the voltage range may be greater than the ripple current corresponding to the minimum voltage in the voltage range, such as Figure 6 The parabola corresponding to ΔiL (Vo_charger, 880) is shown in the figure. At this time, the position of the minimum ripple current on the parabola corresponding to the output voltage of the charging pile needs to be appropriately adjusted, such as adjusting to Figure 6 The value of a in the medium voltage range. That is, adjust the output voltage of the charging pile to move to the left side of the parabola.

[0084] For method 1, the target charging voltage is determined according to the battery voltage and the two end voltages of the voltage range.

[0085] For example, Figure 7 As shown, the complete process of the vehicle charging method may include the following steps:

[0086] In step S11 , the battery voltage of the vehicle is acquired.

[0087] In step S121, the target charging voltage is determined in the voltage interval according to the magnitude relationship between the first sum value and the battery voltage, wherein the first sum value is the sum of the maximum voltage and the minimum voltage in the voltage interval.

[0088] In step S13, a charging request including a target charging voltage is sent to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0089] In the disclosed embodiment, the target charging voltage corresponding to the minimum ripple current in the voltage interval can be determined based on the relationship between the first sum and the battery voltage. The entire process has a small amount of calculation and a simple judgment method, which shortens the time for determining the target charging voltage and thereby improves the charging speed.

[0090] In a feasible implementation manner, determining the target charging voltage in the voltage interval according to the magnitude relationship between the first sum and the battery voltage includes:

[0091] When the first sum is less than the battery voltage, determining the minimum voltage in the voltage interval as the target charging voltage;

[0092] When the first sum is greater than or equal to the battery voltage, the maximum voltage in the voltage interval is determined as the target charging voltage.

[0093] It is worth noting that if Fig. 9 As shown, when V = (a + b), the parabola ΔiL (Vo_charger, V) is symmetrical about (a + b) / 2, that is, ΔiL (a, V) = ΔiL (b, V). For example, the parabola at point 4, 770V = (a + b) = 770V, ΔiL (Vo_charger, 770) is symmetrical about 385V, ΔiL (300V, 770V) = ΔiL (470V, 770V), at this time, the target charging voltage is determined to be 470V.

[0094] When V≤(a+b), ΔiL(a, V)>ΔiL(b, V). For example, for the parabola where point 1 is located, 600V<770V, ΔiL(300V, 600V)>ΔiL(470V, 600V), at this time, the target charging voltage is determined to be 470V.

[0095] When V>(a+b), ΔiL(a,V)<ΔiL(b,V). For example, in the parabola where point 6 is located, 900V>770V, ΔiL(300V,900V)<ΔiL(470V,900V), at this time, the target charging voltage is determined to be 300V.

[0096] In summary, the target charging voltage can be determined in the voltage range according to the relationship between the first sum and the battery voltage.

[0097] For example, when the voltage interval is [a, b], the maximum voltage in the voltage interval is b and the minimum voltage is a. Figure 8 As shown, determining the target charging voltage according to the battery voltage and the two end voltages of the voltage interval may include the following steps:

[0098] In step S81 , the battery voltage V is acquired, and the sum (a+b) of the maximum voltage b and the minimum voltage a is determined.

[0099] For example, Fig. 9 As shown, when the maximum voltage b is 470V and the minimum voltage a is 300V, the first sum is 300V+470V=770V.

[0100] In step S82, the battery voltage V is compared with the first sum (a+b), and step S83 or step S84 is executed.

[0101] For example, Fig. 9 As shown, when the battery voltage V is 600V, 650V, 700V, 770V, 800V or 900V, the battery voltage is compared with 770V.

[0102] In step S83 , when V>(a+b), the minimum voltage a is determined as the target charging voltage.

[0103] For example, Fig. 9 As shown in the figure, when the battery voltage V is 800V, the minimum voltage a corresponding to point 5 is determined as the target charging voltage, and the value of the ripple current ΔiL corresponding to point 5 is the smallest. When the battery voltage is 900V, the minimum voltage a corresponding to point 6 is determined as the target charging voltage, and the value of the ripple current ΔiL corresponding to point 6 is the smallest.

[0104] In step S83 , when V≦(a+b), the maximum voltage b is determined as the target charging voltage.

[0105] For example, Fig. 9 As shown, when the battery voltage V is 600V, the maximum voltage b corresponding to point 1 is determined as the target charging voltage, and the value of the ripple current ΔiL corresponding to point 1 is the smallest. When the battery voltage V is 650V, the maximum voltage b corresponding to point 2 is determined as the target charging voltage, and the value of the ripple current ΔiL corresponding to point 2 is the smallest. When the battery voltage V is 700V, the maximum voltage b corresponding to point 3 is determined as the target charging voltage, and the value of the ripple current ΔiL corresponding to point 3 is the smallest. When the battery voltage V is 770V, the maximum voltage b corresponding to point 4 is determined as the target charging voltage, and the value of the ripple current ΔiL corresponding to point 4 is the smallest.

[0106] In the embodiment of the present disclosure, a target charging voltage corresponding to the minimum ripple current is determined in the voltage interval according to the magnitude relationship between the battery voltage and the first sum value, thereby minimizing the ripple current of the vehicle during the charging process.

[0107] It is worth noting that when the battery voltage is near the first sum value, the target charging voltage determined in a short time will jump back and forth between the maximum voltage b and the minimum voltage a, making the charging current of the target charging pile unstable, resulting in low charging efficiency.

[0108] In a feasible implementation manner, the target charging voltage is the maximum voltage in the voltage interval. After the target charging voltage is sent to the target charging pile, the following may also be included:

[0109] Re-acquire the vehicle's battery voltage;

[0110] Based on the relationship between the second sum and the re-acquired battery voltage, a new charging request is sent to the target charging pile so that the target charging pile charges the vehicle according to the new charging request, wherein the second sum is the sum of a preset hysteresis value, the maximum voltage and the minimum voltage in the voltage range, and the preset hysteresis value is used to suppress the output voltage of the target charging pile from jumping back and forth.

[0111] It is worth noting that the preset hysteresis value can be preset according to the charging demand of the vehicle, and the present disclosure does not limit this. In the embodiment of the present disclosure, the preset hysteresis value c=10V is taken.

[0112] In the disclosed embodiment, a new charging request is sent to the target charging pile based on the relationship between the second sum and the new battery voltage to avoid the target charging voltage determined in a short period of time jumping back and forth between the maximum voltage b and the minimum voltage a, thereby improving the charging efficiency.

[0113] In a feasible implementation manner, sending a new charging request to the target charging pile according to the magnitude relationship between the second sum and the reacquired battery voltage may include:

[0114] When the second sum is greater than or equal to the re-acquired battery voltage, sending a charging request for a target charging voltage to the target charging pile;

[0115] When the second sum is less than the re-acquired battery voltage, the minimum voltage in the voltage interval is determined as the new target charging voltage, and a charging request including the new target charging voltage is sent to the target charging pile, so that the target charging pile performs boost charging for the vehicle according to the new target charging voltage.

[0116] For example, when the voltage interval is [300V, 470V], the preset hysteresis value c=10V and the battery voltage V is 600V, a+b=300V+470V=770V is calculated. Since 600V<770V, the target charging voltage is determined to be 470V, and the VCU of the vehicle requests the target charging pile to output a voltage of 470V for boost charging of the vehicle. After charging for a certain period of time, when the front battery voltage changes to 700V, a+b+c=300V+470V+10V=780V is determined. Since 700V≤780V, the target charging voltage remains unchanged, and the VCU of the vehicle requests the target charging pile to maintain an output voltage of 470V for boost charging of the vehicle. After charging continues for a certain period of time, when the battery voltage changes to 800V, 800V>780V, therefore, the target charging voltage is determined to be 300V, and the vehicle's VCU requests the target charging pile to output a voltage of 300V for boost charging of the vehicle.

[0117] In the disclosed embodiment, in order to avoid the target charging voltage jumping back and forth between the maximum voltage b and the minimum voltage a in a short period of time, after determining the maximum voltage as the target charging voltage, a new charging request is sent to the target charging pile based on the relationship between the new battery voltage and the second sum value, so as to avoid the unstable charging current of the target charging pile caused by the back and forth jumping of the output voltage of the target charging pile, thereby improving the charging efficiency of the battery on the vehicle.

[0118] For the second method, the target charging voltage is determined according to the battery voltage and a preset mapping relationship between the ripple current and the charging voltage.

[0119] For example, Fig.10 As shown, the complete process of the vehicle charging method may include the following steps:

[0120] In step S11 , the battery voltage of the vehicle is acquired.

[0121] In step S122, a target mapping relationship is determined from a plurality of preset mapping relationships between ripple current and charging voltage according to the battery voltage, and a target charging voltage is determined in the voltage range according to the target mapping relationship, wherein one battery voltage corresponds to one mapping relationship.

[0122] In step S13, a charging request including a target charging voltage is sent to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0123] In the disclosed embodiment, the target mapping relationship can be determined according to the battery voltage, and the target charging voltage corresponding to the minimum ripple current in the voltage interval can be determined according to the target mapping relationship. The target charging voltage determined in this way is more accurate, and the ripple current can be accurately suppressed, thereby achieving accurate suppression of the heating temperature of the motor rotor.

[0124] In a feasible implementation manner, determining the target charging voltage in the voltage interval according to the target mapping relationship may include:

[0125] For each voltage in the voltage range, determine the ripple current corresponding to the voltage according to the target mapping relationship;

[0126] determining a candidate voltage corresponding to a minimum ripple current in the voltage interval;

[0127] Based on the candidate voltages, a target charging voltage is determined.

[0128] It is worth noting that each voltage in the voltage interval is separated by a preset step length, and the preset step length can be preset according to the calculation accuracy, and the present disclosure does not limit this.

[0129] For example, Fig. 9As shown in the figure, when the battery voltage is 600V, the target mapping relationship of the corresponding battery voltage is the parabola where point 1 is located. For each voltage in the voltage interval [300V, 470V], the ripple current corresponding to the voltage is determined according to the parabola where point 1 is located; in the voltage interval [300V, 470V], the candidate voltage corresponding to the minimum ripple current of 23.30A is determined to be 470V, that is, Fig. 9 The horizontal axis of the midpoint 1 takes 470V as the target charging voltage.

[0130] In a feasible implementation manner, determining the target charging voltage according to the candidate voltage may include:

[0131] When there are multiple candidate voltages, the largest candidate voltage is determined as the target charging voltage.

[0132] For example, Fig. 9 As shown in the figure, when the battery voltage is 770V, the target mapping relationship determined according to the battery voltage is the parabola where point 4 is located. For each voltage in the voltage interval [300V, 470V], the ripple current corresponding to the voltage is determined according to the parabola where point 4 is located; in the voltage interval [300V, 470V], the candidate voltages corresponding to the minimum ripple current 44.798A are determined to include 300V and 470V, and 470V is used as the target charging voltage, that is, Fig. 9 The horizontal coordinate of midpoint 4.

[0133] In the embodiments of the present disclosure, a target mapping relationship between ripple current and charging voltage can be determined according to the battery voltage, and a target charging voltage can be determined in the voltage range according to the target mapping relationship, so as to achieve precise suppression of ripple current, and further achieve precise suppression of the heating temperature of the motor rotor.

[0134] In summary, the vehicle charging method provided by the present disclosure can simultaneously reduce the magnetic flux density of the motor rotor by suppressing the ripple current during the vehicle boost charging process, so as to reduce the eddy current loss of the motor rotor and thus reduce the heating temperature of the motor rotor. When the charging pile power is sufficient, the charging power of the charging pile can be increased by 10% to 20%. Since the charging piles have charging power restrictions, the temperature of the motor rotor on the vehicle can also be reduced when the charging pile power is limited to improve the reliability of the motor.

[0135] Fig.11 is a block diagram of a vehicle charging device according to an exemplary embodiment. Fig.11 The vehicle charging device includes an acquisition module 1101, a determination module 1102 and an execution module 1103.

[0136] The acquisition module 1101 is configured to acquire the battery voltage of the vehicle.

[0137] The determination module 1102 is configured to determine a target charging voltage in a voltage interval according to the battery voltage to suppress the ripple current of the vehicle during the charging process, and the voltage interval represents the interval of the input voltage of the vehicle during the charging process.

[0138] The execution module 1103 is configured to send a charging request including a target charging voltage to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0139] In the disclosed embodiment, the target charging pile is controlled to dynamically adjust the output voltage according to the vehicle battery voltage to boost the charging of the vehicle, thereby suppressing the ripple current of the vehicle during the charging process. Since the magnetic flux density of the motor rotor on the vehicle is positively correlated with the magnitude of the ripple current, the magnetic flux density of the motor rotor can be simultaneously reduced by suppressing the ripple current during the vehicle charging process, thereby reducing the eddy current loss of the motor rotor, thereby reducing the heating temperature of the motor rotor and extending the life of the motor.

[0140] In a feasible implementation manner, the determination module 1102 is configured to determine the target charging voltage in the voltage interval according to a magnitude relationship between the first sum value and the battery voltage, wherein the first sum value is a sum of a maximum voltage and a minimum voltage in the voltage interval;

[0141] or,

[0142] According to the battery voltage, a target mapping relationship is determined among a plurality of preset mapping relationships between the ripple current and the charging voltage, and according to the target mapping relationship, a target charging voltage is determined in the voltage range, wherein one battery voltage corresponds to one preset mapping relationship.

[0143] In a feasible implementation, the determination module 1102 is configured to determine the minimum voltage in the voltage interval as the target charging voltage when the first sum value is less than the battery voltage;

[0144] When the first sum is greater than or equal to the battery voltage, the maximum voltage in the voltage interval is determined as the target charging voltage.

[0145] In a feasible implementation manner, the determination module 1102 is configured to determine, for each voltage in the voltage interval, a ripple current corresponding to the voltage according to a target mapping relationship;

[0146] determining a candidate voltage corresponding to a minimum ripple current in the voltage interval;

[0147] Based on the candidate voltages, a target charging voltage is determined.

[0148] In a feasible implementation, the determination module 1102 is configured to determine the largest candidate voltage as the target charging voltage when there are multiple candidate voltages.

[0149] In a feasible implementation, the acquisition module 1101 is configured to reacquire the battery voltage of the vehicle after sending the target charging voltage to the target charging pile, and the target charging voltage is the maximum voltage in the voltage range;

[0150] The execution module 1103 is configured to send a new charging request to the target charging pile based on the relationship between the second sum value and the re-acquired battery voltage, so that the target charging pile charges the vehicle according to the new charging request, wherein the second sum value is the sum of a preset hysteresis value, the maximum voltage and the minimum voltage in the voltage range, and the preset hysteresis value is used to suppress the output voltage of the target charging pile from jumping back and forth.

[0151] In a feasible implementation manner, the execution module 1103 is configured to send a charging request for maintaining a target charging voltage to the target charging pile when the second sum is greater than or equal to the re-acquired battery voltage;

[0152] When the second sum is less than the re-acquired battery voltage, the minimum voltage in the voltage interval is determined as the new target charging voltage, and a charging request including the new target charging voltage is sent to the target charging pile, so that the target charging pile performs boost charging for the vehicle according to the new target charging voltage.

[0153] In a feasible implementation, the determination module 1102 is configured to determine a target charging power of the vehicle and a voltage level of a target charging pile;

[0154] Determine the minimum charging voltage of the vehicle according to the target charging power;

[0155] Determine the maximum charging voltage of the vehicle according to the voltage level;

[0156] Determine the voltage range based on the minimum charging voltage and the maximum charging voltage.

[0157] Regarding the vehicle charging device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0158] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, and when the program instructions are executed by a processor, the steps of the vehicle charging method provided by the present disclosure are implemented.

[0159] The present disclosure also provides a vehicle, comprising:

[0160] a first processor;

[0161] a first memory for storing processor executable instructions;

[0162] The processor is configured as follows:

[0163] Get the battery voltage of the vehicle;

[0164] According to the battery voltage, a target charging voltage is determined in a voltage range to suppress the ripple current of the vehicle during the charging process, and the voltage range represents the range of the input voltage of the vehicle during the charging process;

[0165] A charging request including a target charging voltage is sent to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage.

[0166] In the disclosed embodiment, the target charging pile is controlled to dynamically adjust the output voltage according to the vehicle battery voltage to boost the charging of the vehicle, thereby suppressing the ripple current of the vehicle during the charging process. Since the magnetic flux density of the motor rotor on the vehicle is positively correlated with the magnitude of the ripple current, the magnetic flux density of the motor rotor can be simultaneously reduced by suppressing the ripple current during the vehicle charging process, thereby reducing the eddy current loss of the motor rotor, thereby reducing the heating temperature of the motor rotor and extending the life of the motor.

[0167] Fig.12 1 is a block diagram of a vehicle 1200 according to an exemplary embodiment. For example, the vehicle 1200 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. The vehicle 1200 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0168] Reference Fig.12 , the vehicle 1200 may include various subsystems, for example, an infotainment system 1210, a perception system 1220, a decision control system 1230, a drive system 1240, and a computing platform 1250. The vehicle 1200 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 1200 may be interconnected by wire or wireless means.

[0169] In some embodiments, the infotainment system 1210 may include a communication system, an entertainment system, and a navigation system, etc.

[0170] The perception system 1220 may include several sensors for sensing information about the environment around the vehicle 1200. For example, the perception system 1220 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0171] The decision control system 1230 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0172] The drive system 1240 may include components that provide powered motion for the vehicle 1200. In one embodiment, the drive system 1240 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0173] Some or all functions of the vehicle 1200 are controlled by a computing platform 1250. The computing platform 1250 may include at least one first processor 1251 and a first memory 1252, and the first processor 1251 may execute instructions 1253 stored in the first memory 1252.

[0174] The first processor 1251 may be any conventional processor, such as a commercially available CPU. The processor may also include a graphics processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a system on chip (System on Chip, SOC), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or a combination thereof.

[0175] The first memory 1252 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0176] In addition to the instructions 1253 , the first memory 1252 may also store data, such as road maps, route information, and data such as the location, direction, and speed of the vehicle. The data stored in the first memory 1252 may be used by the computing platform 1250 .

[0177] In the embodiment of the present disclosure, the first processor 1251 may execute instruction 1253 to complete all or part of the steps of the above-mentioned vehicle charging method.

[0178] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned vehicle charging method when executed by the programmable device.

[0179] Some embodiments of the present disclosure also provide a chip system, such as Fig.13 As shown, the chip system includes at least one second processor 1301 and at least one interface circuit 1302. The second processor 1301 and the interface circuit 1302 can be interconnected through lines. For example, the interface circuit 1302 can be used to receive signals from other devices (such as the memory of the electronic device). For another example, the interface circuit 1302 can be used to send signals to other devices (such as the second processor 1301). Exemplarily, the interface circuit 1302 can read the instructions stored in the memory and send the instructions to the second processor 1301. When the instructions are executed by the second processor 1301, the vehicle charging device can perform the various steps in the above embodiments. Of course, the chip system can also include other discrete devices, and some embodiments of the present disclosure are not specifically limited to this.

[0180] In some embodiments of the present disclosure, the interface circuit 1302 can obtain data, program instructions and / or information from the internal storage area of ​​the chip system; it can also obtain data, program instructions and / or information from outside the chip system.

[0181] Optionally, the chip system also includes a second memory 1303, and the second memory 1303 is used to store computer programs and data.

[0182] Those skilled in the art may also understand that the various illustrative logical blocks and steps listed in the embodiments of the present application may be implemented by electronic hardware, computer software, or a combination of the two. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present application.

[0183] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or diagram. Any aspect or design described herein as "exemplary" is not necessarily to be understood as being advantageous over other aspects or designs. Instead, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or".

[0184] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and conducive to any given or specific application. In addition, with respect to "including", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0185] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0186] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0187] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more.

Claims

1. A vehicle charging method, characterized in that: include: Get the battery voltage of the vehicle; Determining a target charging voltage in a voltage interval according to the battery voltage to suppress a ripple current of the vehicle during charging, wherein the voltage interval represents an interval of an input voltage of the vehicle during charging; Sending a charging request including the target charging voltage to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage; The target charging voltage is the maximum voltage in the voltage interval. After sending the target charging voltage to the target charging pile, the method further includes: reacquiring a battery voltage of the vehicle; Based on the relationship between the second sum value and the re-acquired battery voltage, a new charging request is sent to the target charging pile so that the target charging pile charges the vehicle according to the new charging request, wherein the second sum value is a preset hysteresis value, the sum of the maximum voltage and the minimum voltage in the voltage range, and the preset hysteresis value is used to suppress the output voltage of the target charging pile from jumping back and forth.

2. The vehicle charging method according to claim 1, characterized in that: The step of determining a target charging voltage in a voltage interval according to the battery voltage includes: determining a target charging voltage in the voltage interval according to a magnitude relationship between a first sum value and the battery voltage, wherein the first sum value is a sum of a maximum voltage and a minimum voltage in the voltage interval; or, According to the battery voltage, a target mapping relationship is determined from a plurality of preset mapping relationships between ripple current and charging voltage, and according to the target mapping relationship, a target charging voltage is determined in the voltage interval, wherein one battery voltage corresponds to one preset mapping relationship.

3. The vehicle charging method according to claim 2, characterized in that: The step of determining the target charging voltage in the voltage interval according to the magnitude relationship between the first sum and the battery voltage includes: When the first sum is less than the battery voltage, determining the minimum voltage in the voltage interval as the target charging voltage; When the first sum is greater than or equal to the battery voltage, the maximum voltage in the voltage interval is determined as the target charging voltage.

4. The vehicle charging method according to claim 2, characterized in that: The determining the target charging voltage in the voltage interval according to the target mapping relationship includes: For each voltage in the voltage interval, determining a ripple current corresponding to the voltage according to the target mapping relationship; determining a candidate voltage corresponding to a minimum ripple current in the voltage interval; A target charging voltage is determined according to the candidate voltages.

5. The vehicle charging method according to claim 4, characterized in that: The step of determining a target charging voltage according to the candidate voltage includes: When there are multiple candidate voltages, the largest candidate voltage is determined as the target charging voltage.

6. The vehicle charging method according to claim 1, characterized in that: The sending a new charging request to the target charging pile according to the magnitude relationship between the second sum and the reacquired battery voltage includes: When the second sum is greater than or equal to the re-acquired battery voltage, sending a charging request for maintaining the target charging voltage to the target charging pile; When the second sum is less than the re-acquired battery voltage, the minimum voltage in the voltage interval is determined as the new target charging voltage, and a charging request including the new target charging voltage is sent to the target charging pile, so that the target charging pile performs boost charging for the vehicle according to the new target charging voltage.

7. The vehicle charging method according to any one of claims 1 to 5, characterized in that: The voltage interval is determined as follows: Determining a target charging power for the vehicle and a voltage level for the target charging pile; Determining a minimum charging voltage of the vehicle according to the target charging power; Determining a maximum charging voltage of the vehicle according to the voltage level; The voltage interval is determined according to the minimum charging voltage and the maximum charging voltage.

8. A vehicle charging device, characterized in that: include: An acquisition module configured to acquire a battery voltage of a vehicle; a determination module configured to determine a target charging voltage in a voltage interval according to the battery voltage to suppress a ripple current of the vehicle during charging, wherein the voltage interval represents an interval of an input voltage of the vehicle during charging; an execution module, configured to send a charging request including the target charging voltage to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage; The acquisition module is further configured to reacquire the battery voltage of the vehicle after sending the target charging voltage to the target charging pile, wherein the target charging voltage is the maximum voltage in the voltage range; Correspondingly, the execution module is also configured to send a new charging request to the target charging pile based on the relationship between the second sum value and the re-acquired battery voltage, so that the target charging pile charges the vehicle according to the new charging request, wherein the second sum value is a preset hysteresis value, the sum of the maximum voltage and the minimum voltage in the voltage range, and the preset hysteresis value is used to suppress the output voltage of the target charging pile from jumping back and forth.

9. A vehicle, characterized in that: include: a first processor; a first memory for storing processor executable instructions; Wherein, the first processor is configured as follows: Get the battery voltage of the vehicle; Determining a target charging voltage in a voltage interval according to the battery voltage to suppress a ripple current of the vehicle during charging, wherein the voltage interval represents an interval of an input voltage of the vehicle during charging; Sending a charging request including the target charging voltage to a target charging pile, so that the target charging pile performs boost charging for the vehicle according to the target charging voltage; The target charging voltage is the maximum voltage in the voltage interval. After sending the target charging voltage to the target charging pile, the method further includes: reacquiring a battery voltage of the vehicle; Based on the relationship between the second sum value and the re-acquired battery voltage, a new charging request is sent to the target charging pile so that the target charging pile charges the vehicle according to the new charging request, wherein the second sum value is a preset hysteresis value, the sum of the maximum voltage and the minimum voltage in the voltage range, and the preset hysteresis value is used to suppress the output voltage of the target charging pile from jumping back and forth.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

11. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 7 when being executed by a processor.

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