Charging control method and vehicle electrical system

Abstract

The invention relates to the technical field of automobile control, in particular to a charging control method for an electric automobile, a vehicle electrical system, a computer storage medium containing a computer program / instruction for implementing the charging control method and a computer program product. According to one aspect of the invention, the charging control method for the electric vehicle comprises the following steps: determining a charging mode based on a charging voltage specification of a charging pile and a charging voltage specification of the electric vehicle, wherein the charging mode comprises a boost charging mode and a direct charging mode; when the charging mode is determined as the boost charging mode, determining a pre-charging voltage and a charging target voltage of a battery pack based on a charging voltage specification of the charging pile and a current voltage of the battery pack of the electric vehicle, the charging voltage specification of the charging pile is determined based on the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile.

Description

Technical Field

[0001] The present application relates to the field of automobile control technology, and in particular to a charging control method for an electric vehicle, a vehicle electrical system, a computer storage medium containing a computer program / instruction for implementing the charging control method, and a computer program product. Background Art

[0002] The number of charging infrastructures is growing rapidly, which has led to compatibility issues. In particular, the design of many charging piles does not follow national standards or industry standards, resulting in poor compatibility between charging piles and vehicles, which greatly affects the user experience. In addition, more and more new energy vehicle models are currently developed based on high-voltage platforms, which further exacerbates compatibility issues. Summary of the invention

[0003] An object of the present application is to provide a charging control method and a vehicle electrical system for an electric vehicle, which can achieve higher charging compatibility.

[0004] A charging control method for an electric vehicle according to one aspect of the present application includes:

[0005] Determining a charging mode based on a charging voltage specification of a charging pile and a charging voltage specification of the electric vehicle, wherein the charging mode includes a boost charging mode and a direct charging mode;

[0006] When the charging mode is determined to be the boost charging mode, the pre-charging voltage and the charging target voltage of the battery pack are determined based on the charging voltage specification of the charging pile and the current voltage of the battery pack of the electric vehicle,

[0007] Among them, the charging voltage specification of the charging pile is determined based on the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile.

[0008] Optionally, in the above charging control method, the step of determining the charging mode includes:

[0009] When the insulation detection voltage of the charging pile is available, determining the smaller value between the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile as the charging voltage specification of the charging pile;

[0010] When the insulation detection voltage is unavailable, determining a charging voltage specification of the charging pile based on the maximum output voltage;

[0011] When the charging voltage specification of the charging pile is lower than the charging voltage specification of the electric vehicle, the charging mode is determined to be the boost charging mode.

[0012] Optionally, in the above-mentioned charging control method, the pre-charge voltage is the smaller value of the following two: i) the difference between the current voltage of the battery pack and the first set value; ii) a second set value determined based on the charging voltage specification of the charging pile and the degree of matching between the insulation detection voltage and the maximum output voltage.

[0013] Optionally, in the above charging control method, the first set value is the minimum allowable value of the difference between the output voltage and the input voltage of the boost circuit of the electric vehicle.

[0014] Optionally, in the above-mentioned charging control method, the charging target voltage is determined as follows: when the insulation detection voltage matches the maximum output voltage, the sum of the pre-charge voltage and the third set value is determined as the charging target voltage; when the insulation detection voltage does not match the maximum output voltage, the smaller value of the following two is determined as the charging target voltage: i) the difference between the current voltage of the battery pack and the fourth set value; ii) the fifth set value determined based on the charging voltage specification of the charging pile.

[0015] Optionally, in the above charging control method, further comprising:

[0016] In the pre-charging stage, the voltage of the charging port approaches the pre-charging voltage at a set boosting rate by controlling the boost circuit connected between the charging port of the electric vehicle and the battery pack.

[0017] Optionally, in the above charging control method, further comprising:

[0018] In the charging stage, when the current voltage of the charging port does not approach the charging target voltage within a set period of time, the charging target voltage is adjusted to the difference between the pre-charging voltage and a sixth set value.

[0019] Optionally, in the above charging control method, further comprising:

[0020] During the charging stage, the boost circuit is controlled so that the current flowing into the boost circuit increases at a set first rate until the current voltage of the charging port approaches the charging target voltage, and the current flowing into the boost circuit is kept unchanged when the current voltage of the charging port approaches the charging target voltage.

[0021] Optionally, in the above charging control method, further comprising:

[0022] In the charging stage, when the current voltage of the charging port continues to decrease, the current flowing into the boost circuit is reduced at a set second rate until the current voltage of the charging port is maintained at a first set voltage value.

[0023] Optionally, in the above charging control method, further comprising:

[0024] In the charging stage, when the current voltage of the charging port is continuously lower than the second set voltage value, the current flowing into the boost circuit is stopped until the current voltage of the charging port approaches the charging target voltage.

[0025] A vehicle electrical system according to another aspect of the present application includes a charging port, a battery pack, a boost circuit connected between the charging port and the battery pack, and a charging controller for controlling the boost circuit, wherein the charging controller is configured to perform the following operations:

[0026] Determining a charging mode based on the charging voltage specification of the charging pile and the charging voltage specification of the electric vehicle, wherein the charging mode includes a boost charging mode and a direct charging mode;

[0027] When the charging mode is determined to be the boost charging mode, the pre-charging voltage and the charging target voltage of the battery pack are determined based on the charging voltage specification of the charging pile and the current voltage of the battery pack,

[0028] Among them, the charging voltage specification of the charging pile is determined based on the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile.

[0029] Optionally, in the above vehicle electrical system, the operation of determining the charging mode includes:

[0030] When the insulation detection voltage of the charging pile is available, determining the smaller value between the insulation detection voltage and the maximum output voltage reported by the charging pile as the charging voltage specification of the charging pile;

[0031] When the insulation detection voltage is unavailable, determining a charging voltage specification of the charging pile based on the maximum output voltage;

[0032] When the charging voltage specification of the charging pile is lower than the charging voltage specification of the electric vehicle, the charging mode is determined to be the boost charging mode.

[0033] Optionally, in the above-mentioned vehicle electrical system, the pre-charge voltage is the smaller value of the following two: i) the difference between the current voltage of the battery pack and the first set value; ii) a second set value determined based on the charging voltage specification of the charging pile and the degree of matching between the insulation detection voltage and the maximum output voltage.

[0034] Optionally, in the above-mentioned vehicle electrical system, the charging target voltage is determined as follows: when the insulation detection voltage matches the maximum output voltage, the sum of the pre-charge voltage and the third set value is determined as the charging target voltage; when the insulation detection voltage does not match the maximum output voltage, the smaller value of the following two is determined as the charging target voltage: i) the difference between the current voltage of the battery pack and the fourth set value; ii) the fifth set value determined based on the charging voltage specification of the charging pile.

[0035] Optionally, in the above-mentioned vehicle electrical system, the first set value is a minimum allowable value of the difference between the output voltage and the input voltage of the boost circuit.

[0036] Optionally, in the above vehicle electrical system, the charging controller is configured to further perform the following operations:

[0037] In the pre-charging stage, the boost circuit is controlled to make the voltage of the charging port approach the pre-charging voltage at a set boost rate.

[0038] Optionally, in the above vehicle electrical system, the charging controller is configured to further perform the following operations:

[0039] In the charging stage, when the current voltage of the charging port does not approach the charging target voltage within a set period of time, the charging target voltage is adjusted to the difference between the pre-charging voltage and a sixth set value.

[0040] Optionally, in the above vehicle electrical system, the charging controller is configured to further perform the following operations:

[0041] During the charging stage, the boost circuit is controlled so that the current flowing into the boost circuit increases at a set first rate until the current voltage of the charging port approaches the charging target voltage, and the current flowing into the boost circuit is kept unchanged when the current voltage of the charging port approaches the charging target voltage.

[0042] Optionally, in the above vehicle electrical system, the charging controller is configured to further perform the following operations:

[0043] In the charging stage, when the current voltage of the charging port continues to decrease, the current flowing into the boost circuit is reduced at a set second rate until the current voltage of the charging port is maintained at a first set voltage value.

[0044] Optionally, in the above vehicle electrical system, the charging controller is configured to further perform the following operations:

[0045] In the charging stage, when the current voltage of the charging port is continuously lower than the second set voltage value, the current flowing into the boost circuit is stopped until the current voltage of the charging port approaches the charging target voltage.

[0046] Optionally, in the above-mentioned vehicle electrical system, the boost circuit includes an inductor and a switch element connected in series between the charging port and the battery pack, and the on-off of the switch element is controlled by the charging controller.

[0047] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program / instruction, and when the computer program / instruction is executed by a processor, the steps of the method described above are implemented.

[0048] According to another aspect of the present application, a computer program product is provided. The computer program product comprises a computer program / instruction. When the computer program / instruction is executed by a processor, the steps of the method described above are implemented.

[0049] In some embodiments of the present application, the corresponding relationship between the insulation detection voltage, the maximum output voltage reported by the charging pile, and the estimated maximum output voltage of the charging pile can be obtained by summarizing and statistically analyzing the measured data of a large number of charging piles that have been put into use, thereby improving the compatibility between the vehicle and the charging pile. In other embodiments, by real-time monitoring of the voltage of the charging port during the charging stage and dynamically adjusting the load current according to the voltage, the problem of charging failure caused by unstable charging port voltage can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or other aspects and advantages of the present application will become clearer and easier to understand through the following description of various aspects in conjunction with the accompanying drawings, in which the same or similar units are represented by the same reference numerals. The accompanying drawings include:

[0051] Figure 1 FIG. 1 is a schematic diagram of a vehicle electrical system according to an embodiment of the present application.

[0052] Figure 2 The present invention is a circuit schematic diagram of a vehicle electrical system according to another embodiment of the present application.

[0053] Figure 3 The figure is a flow chart of a charging control method for an electric vehicle according to another embodiment of the present application.

[0054] Figure 4 The following is a flowchart of a charging control method for an electric vehicle according to another embodiment of the present application. DETAILED DESCRIPTION

[0055] The present application is described more fully below with reference to the accompanying drawings in which illustrative embodiments of the present application are illustrated. However, the present application may be implemented in different forms and should not be interpreted as being limited to the embodiments given herein. The above embodiments are given to make the disclosure herein comprehensive and complete, so as to more fully convey the scope of protection of the present application to those skilled in the art.

[0056] In this specification, terms such as "comprise" and "include" indicate that in addition to the units and steps directly and explicitly stated in the specification and claims, the technical solution of the present application does not exclude the situation where there are other units and steps that are not directly or explicitly stated.

[0057] In this specification, "connection" refers to an electrical connection for transmitting power or a communication connection for transmitting signals between two or more hardware entities, which includes the situation where two hardware entities are directly connected, and also includes the situation where two hardware entities are connected via other hardware entities.

[0058] Figure 1 FIG. 1 is a schematic diagram of a vehicle electrical system according to an embodiment of the present application. Figure 1 In the figure, the power transmission path or channel is represented by a thick solid line and the communication link is represented by a thin solid line. Figure 1 The vehicle electrical system 10 shown includes a power distribution box 110, a boost circuit 120, a battery pack 130, and a charging controller 140. The power distribution box 110 includes a charging port (not shown) as an interface between a charging pile 20 outside the vehicle and the vehicle electrical system 10. When charging, the charging port is connected to the charging pile 20 on one hand and to the boost circuit 120 or the battery pack 130 on the other hand. Figure 1 As shown, the boost circuit 120 is connected between the distribution box 110 and the battery pack 130. The charging controller 140 is connected to the distribution box 110, the boost circuit 120 and the battery pack 130 (or the battery management system) through a communication link, so as to control the operation of the distribution box 110 and the boost circuit 120 and obtain the status of the battery pack (such as voltage, current and SOC, etc.). Exemplarily, the above communication connection can be implemented with the help of a CAN bus. In addition, the charging controller 140 can be implemented using various types of controllers, such as but not limited to microcontrollers, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs) and systems on chips.

[0059] See also Figure 1There is a direct connection channel and a boost channel via the boost circuit 120 between the power distribution box 110 and the battery pack 130. Under the control of the charging controller 140, the charging pile 20 can charge the battery pack 130 via the boost channel formed by the power distribution box 110 and the boost circuit 120 (hereinafter referred to as the "boost charging mode"), or directly charge the battery pack 130 via the power distribution box 110 (hereinafter referred to as the "direct charging mode").

[0060] Figure 2 This is a circuit schematic diagram of a vehicle electrical system according to another embodiment of the present application. The circuit shown can be implemented Figure 1 The vehicle electrical system in the Figure 2 In, with Figure 1 Components that are the same or similar to the components in FIG. 1 are indicated by the same reference numerals. In addition, for the purpose of simplicity, the charge controller is not shown in FIG. Figure 2 See Figure 2 The distribution box 110 includes a capacitor C2 and relays K1 to K4 whose on / off states are controlled by the charging controller. The DC positive bus DC+ is connected to the positive electrode of the battery pack 130 via the relay K1 to form a first branch P1, and the DC negative bus DC- is connected to the negative electrode of the battery pack 130 via the relay K3 to form a second branch P2. Figure 2 As shown, the distribution box 110 further includes a third branch P3, which is connected to the DC negative busbar DC- and includes relays K2 and K4, and a capacitor C2 is connected across the branches P2 and P3.

[0061] The boost circuit 120 includes a coil L and a switch element Q, wherein the on and off state of the switch element Q is controlled by a charging controller. Figure 2 The switching element Q in the figure is shown in the form of a metal-oxide-semiconductor field-effect transistor (MOS tube), but other types of switching elements are also available, including but not limited to bipolar junction transistors (BJT) and junction field-effect transistors (JFET).

[0062] Continue to see Figure 2 Optionally, a capacitor C1 is connected in parallel at both ends of the battery pack 130 to absorb and filter high-frequency voltage ripples and maintain the relative stability of the battery pack output voltage within a certain range.

[0063] When the vehicle electrical system operates in the direct charging mode, under the control of the charging controller, the relays K1 and K3 are in the on state and the relays K2 and K4 are in the off state. At this time, the charging pile 20 is directly connected to the battery pack 130 via the DC positive bus DC+ and the DC negative bus DC-. On the other hand, when the vehicle electrical system operates in the boost charging mode, it first enters the pre-charging stage. In this stage, under the control of the charging controller, the relays K1, K3 and K4 are in the on state and the relay K2 is in the on state. By applying a control signal (such as a pulse width modulation signal) to the control end (such as the gate) of the switching element Q, the battery pack 130 performs a pre-charging operation on the capacitor C2; then enters the charging stage. In this stage, the relays K1, K2, K4 are in the on state and the relay K3 is in the off state, so that the DC positive bus DC+ is connected to the positive electrode of the battery pack 130, and the DC negative bus DC- is connected to the negative electrode of the battery pack 120 through the coil L and the switching element Q in the boost circuit 120. During the charging stage, the charging controller applies a control signal to the control end of the switch element Q, so that the switch element Q alternately switches between the on state and the off state to increase the charging voltage of the battery pack 130. By adjusting the characteristic parameters of the control signal (such as the duty cycle of the pulse width modulation signal), the charging controller can control the boost amplitude and change rate and the amplitude and change rate of the load current (the current flowing into the boost circuit 130).

[0064] Figure 3 FIG. 1 is a flow chart of a charging control method for an electric vehicle according to another embodiment of the present application. Figure 1 and Figure 2 The vehicle electrical system shown in FIG. 1 is described as an example. However, it should be noted that Figure 3 Implementation of the method shown is not limited to a vehicle electrical system having a specific configuration.

[0065] Figure 3 The method shown begins at step 310. In this step, the charging controller 140 determines the charging voltage specification of the charging pile 20 (for example, it can be expressed as an estimated maximum output voltage of the charging pile). In some specific embodiments, the charging controller 140 determines the charging voltage specification based on the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile. Exemplarily, the insulation detection voltage can be measured at the charging port (for example, Figure 2 The maximum output voltage reported by the charging pile can be extracted from the CML message sent by the charging pile 20 to the charging controller 140.

[0066] Table 1 describes an exemplary correspondence between the insulation detection voltage, the maximum output voltage reported by the charging pile, and the estimated maximum output voltage of the charging pile. The correspondence can be obtained by summarizing and statistically analyzing the measured data of a large number of charging piles that have been put into use. The charging controller 140 can determine the corresponding estimated maximum output voltage of the charging pile by looking up the insulation detection voltage and the maximum output voltage reported by the charging pile.

[0067] The corresponding relationship shown in Table 1 reflects the so-called "safety principle". Specifically, when the insulation detection voltage of the charging pile is available, the smaller value of the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile is calibrated as the estimated maximum output voltage of the charging pile, thereby reducing the risk of the charging voltage exceeding the charging voltage specification of the electric vehicle or battery pack; on the other hand, when the insulation detection voltage cannot be obtained or is unavailable, if the maximum output voltage reported by the charging pile is lower than the highest level output voltage of the charging pile (for example, 1000V), the reported maximum output voltage is calibrated as the estimated maximum output voltage of the charging pile, otherwise, the output voltage corresponding to the next level of the reported maximum output voltage (for example, 750V) is calibrated as the estimated maximum output voltage of the charging pile, which also reduces the risk of the charging voltage exceeding the charging voltage specification of the electric vehicle.

[0068] Table 1

[0069]

[0070] Then, step 320 is entered, in which the charging controller 140 determines the charging mode based on the charging voltage specification of the charging pile and the charging voltage specification of the electric vehicle. For example, assuming that the charging voltage specification or the maximum chargeable voltage of the electric vehicle is 1000V, when it is determined that the charging voltage specification of the charging pile is less than 1000V (such as 500V or 750V in Table 1), the charging mode of the vehicle electrical system is set to the boost charging mode, otherwise, it is set to the direct charging mode. When the charging mode is determined to be the direct charging mode, Figure 3 The process shown will enter step 330; on the other hand, when it is determined that the charging mode is the boost charging mode, Figure 3 The process shown will enter step 340.

[0071] In step 330, under the control of the charging controller 140, the charging pile 20 directly charges the battery pack 130 via the power distribution box 110. Figure 2 In the example shown, under the control of the charging controller, the relays K1 and K3 are in the on state and the relays K2 and K4 are in the off state.

[0072] In step 340, the charging controller 140 determines the charging voltage specification of the charging pile determined in step 310 and the current voltage V of the battery pack 130. pack To determine the pre-charge voltage V pre_charge (For example, in Figure 2 In the example shown, the pre-charge voltage of the capacitor C2 and the charging target voltage V target (eg, the charging voltage across the battery pack 130 or the capacitor C1 in a steady state).

[0073] In some specific embodiments, the charging controller 140 may determine the pre-charge voltage V as follows: pre_charge :

[0074] V pre_charge =min(V pack -α 1， α2) (1)

[0075] Here V pack is the current voltage of the battery pack, α1 is a first setting value (e.g., set to 90 V) that can be set based on the performance setting of the boost circuit 120, and α2 is a second setting value that can be set based on the charging voltage specification of the charging pile determined in step 310 (e.g., based on the estimated maximum output voltage V est_max Indicates) and insulation detection voltage V insulation The maximum output voltage V reported by the charging pile rep_max is determined by the degree of match between them.

[0076] In the above specific implementation, optionally, the minimum allowable value of the difference between the output voltage and the input voltage of the boost circuit 120 is determined as the first set value α1.

[0077] Alternatively, the second setting value α2 may be determined in the following manner:

[0078] If the insulation detection voltage V insulation The maximum output voltage V reported by the charging pile rep_max If the voltages are not equal, differ greatly, or the insulation detection voltage is unavailable, the second set value α2 is set to a voltage value V L (e.g. 450V), if the insulation detection voltage V insulation The maximum output voltage V reported by the charging pile rep_max If the voltages V and V are the same, the second set value α2 is set to another voltage value V H (e.g. 690V), where the voltage value V H Greater than V L When the insulation detection voltage V insulation The maximum output voltage V reported by the charging pile rep_maxWhen the estimated maximum output voltage of the charging pile is matched, it means that the reliability of the estimated maximum output voltage of the charging pile is higher. Therefore, the pre-charge voltage V pre_charge Try to set it higher, which is beneficial for improving charging efficiency.

[0079] In some other specific implementations, the charging controller 140 may determine the charging target voltage V in the following manner: target :

[0080] When the insulation detection voltage V insulation The maximum output voltage V reported by the charging pile rep_max When the precharge voltage V pre_charge and the third set value α3 (for example, 30V) (V pre_charge +α3) is determined as the charging target voltage V target , wherein the third set value α3 can be determined according to factors such as the performance and efficiency of the boost circuit 120.

[0081] On the other hand, when the insulation detection voltage V insulation The maximum output voltage V reported by the charging pile rep_max When mismatched, determine the charging target voltage V according to the following formula target :

[0082] V target =min(V pack -α 4， α5) (2)

[0083] Among them, V pack is the current voltage of the battery pack, α4 is a fourth set value, which can be determined according to factors such as the performance and efficiency of the boost circuit 120 and is less than the first set value α1 to ensure (V pack -α4) is greater than (V pack -α1) (for example, the value is 60V). α5 is a fifth set value that can be determined based on the charging voltage specification of the charging pile. Optionally, the fifth set value α5 can be determined in the following manner: a corresponding fifth set value α5 is set for each type of charging voltage specification of the charging pile, wherein a larger charging voltage specification corresponds to a larger fifth set value α5. For example, for charging voltage specifications of 500V and 750V, the fifth set value α5 can be set to 480V and 730V, respectively.

[0084] After executing step 340, Figure 3 The process shown enters step 350 to perform a precharge operation. Figure 2Taking the circuit shown as an example, during the pre-charging operation, relays K1, K3 and K4 are in the on state and relay K2 is in the on state. Under the control of the charging controller 140, the switching element Q switches between the on and off states. At this time, the battery pack 130 will charge the capacitor C2, thereby establishing a pre-charging voltage across the capacitor C2.

[0085] In some specific embodiments, during the pre-charging stage, the charging controller 140 controls the boost circuit 120 (for example, by applying a pulse width modulation signal with a certain duty cycle or switching frequency to the gate of the switching element Q) so that the voltage at the charging port IN approaches the pre-charging voltage V determined in step 330 at a set boost rate (for example, 100 V / s). pre_charge , and the voltage at the charging port IN reaches the pre-charge voltage V pre_charge After that, it stabilizes around the pre-charge voltage V pre_charge Within a small fluctuation range (for example, V pre_charge ±10V).

[0086] Then, the process proceeds to step 360, in which the battery pack 130 is charged under the control of the charging controller 140. The details of the charging operation will be described below in conjunction with Figure 4 Give a description.

[0087] Figure 4 A flowchart of a charging control method for an electric vehicle according to another embodiment of the present application is provided. The flowchart shown can be used to implement Figure 3 Similarly, the method described below is still based on the pre-charge operation and charging operation. Figure 1 and 2 The vehicle electrical system shown in the figure is used as an example for description. However, it should be noted that Figure 4 Implementation of the method shown is not limited to a vehicle electrical system having a specific configuration.

[0088] Figure 4 The method shown starts at step 410. In this step, under the control of the charging controller 140, the relays K1, K2, and K4 are in the on state and the relay K3 is in the off state, and the switch element Q is alternately switched between the on state and the off state. By adjusting the characteristic parameters of the control signal applied to the control terminal of the switch element Q (such as the duty cycle or switching frequency of the pulse width modulation signal), the load current I flowing into the boost circuit 120 increases at a constant rate θ1.

[0089] Then, the process proceeds to step 420 , and the charging controller 140 determines the voltage V at the charging port IN of the power distribution box 120 . INIf it continues to fall, then go to step 430, otherwise, go to step 440. For example, in this step, if the voltage V IN The sampling value at the i-th moment is less than or equal to a preset voltage difference δ1 (for example, 10V) compared with the sampling value at the (i-1)-th moment (the previous moment), then the voltage V IN There is a continuous decline.

[0090] In step 430, the charging controller 140 further determines the voltage V at the charging port IN. IN Whether it falls back to the set voltage lower limit V low If the voltage drops below the lower limit V low If yes, then go to step 450 , otherwise, go to step 460 .

[0091] At step 450, the charging controller 140 stops the current from flowing into the boost circuit 120 by turning off the switch element Q until the voltage V at the charging port IN is IN Approaching the charging target voltage V again target After executing step 450, Figure 4 The process shown will return to step 410.

[0092] On the other hand, in step 460, the charging controller 140 adjusts the characteristic parameters of the control signal applied to the control terminal of the switch element Q so that the load current flowing into the boost circuit 120 decreases at a constant rate θ2 until the voltage V at the charging port IN is IN Maintain the set voltage V stable After executing step 460, Figure 4 The process shown will return to step 410.

[0093] Returning to another branch step 440 of step 420, in this step, the charging controller 140 determines the voltage V at the charging port IN. IN Is it close to the aforementioned charging target voltage V target , if it approaches the charging target voltage V target , then go to step 470, otherwise, go to step 410. Exemplarily, in this step, when the voltage V IN and the charging target voltage V target When the difference between the voltage and the voltage is less than or equal to the preset voltage difference δ2 (for example, 10V), the voltage V IN Approaching the charging target voltage V target .

[0094] In step 470, the charging controller 140 maintains the load current flowing into the boost circuit 120 at the current level, thereby charging the target voltage V target The battery pack 140 is charged with the current load current.

[0095] exist Figure 4 In the illustrated embodiment, the problem of charging failure caused by unstable charging port voltage can be solved by real-time monitoring of the voltage of the charging port and dynamically adjusting the load current according to the voltage.

[0096] According to another aspect of the present application, a computer-readable storage medium is also provided, on which a computer program / instruction is stored, and when the program / instruction is executed by a processor, the above-mentioned Figure 3 and 4 One or more steps included in the described method.

[0097] According to another aspect of the present application, a computer program product is provided, including a computer program / instruction, wherein when the computer program is executed by a processor, the above Figure 3 and 4 One or more steps included in the described method.

[0098] Those skilled in the art will appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described herein may be implemented as hardware, computer software, or a combination of both.

[0099] In order to show the interchangeability between hardware and software, various schematic components, blocks, modules, circuits and steps are generally described above according to their functionality. Such functionality is implemented in hardware form or software form depending on the specific application and the design restrictions imposed on the overall system. Those skilled in the art can implement the described functionality in a variable manner for specific specific applications, but such implementation should not be understood as causing a departure from the scope of the present application.

[0100] Although only some of the specific embodiments of the present application are described, it should be understood by those skilled in the art that the present application can be implemented in many other forms without departing from its subject matter and scope. Therefore, the examples and embodiments shown are considered to be illustrative rather than restrictive, and the present application may include various modifications and substitutions without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. A charging control method for an electric vehicle, comprising: Determining a charging mode based on a charging voltage specification of a charging pile and a charging voltage specification of the electric vehicle, wherein the charging mode includes a boost charging mode and a direct charging mode; When the charging mode is determined to be the boost charging mode, the pre-charging voltage and the charging target voltage of the battery pack are determined based on the charging voltage specification of the charging pile and the current voltage of the battery pack of the electric vehicle, Among them, the charging voltage specification of the charging pile is determined based on the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile.

2. The charging control method according to claim 1, wherein: The step of determining the charging mode comprises: When the insulation detection voltage of the charging pile is available, determining the smaller value between the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile as the charging voltage specification of the charging pile; When the insulation detection voltage is unavailable, determining a charging voltage specification of the charging pile based on the maximum output voltage; When the charging voltage specification of the charging pile is lower than the charging voltage specification of the electric vehicle, the charging mode is determined to be the boost charging mode.

3. The charging control method according to claim 1, wherein: The pre-charge voltage is the smaller of the following two values: i) the difference between the current voltage of the battery pack and the first set value; ii) a second set value determined based on the charging voltage specification of the charging pile and the degree of matching between the insulation detection voltage and the maximum output voltage.

4. The charging control method according to claim 3, wherein: The first set value is a minimum allowable value of a difference between an output voltage and an input voltage of a boost circuit of the electric vehicle.

5. The charging control method according to claim 1, wherein: The charging target voltage is determined as follows: when the insulation detection voltage matches the maximum output voltage, the sum of the pre-charge voltage and the third set value is determined as the charging target voltage; when the insulation detection voltage does not match the maximum output voltage, the smaller value of the following two is determined as the charging target voltage: i) the difference between the current voltage of the battery pack and the fourth set value; ii) the fifth set value determined based on the charging voltage specification of the charging pile.

6. The charging control method according to claim 1, wherein: Further including: In the pre-charging stage, the voltage of the charging port approaches the pre-charging voltage at a set boosting rate by controlling the boost circuit connected between the charging port of the electric vehicle and the battery pack.

7. The charging control method according to claim 6, wherein: Further including: In the charging stage, when the current voltage of the charging port does not approach the charging target voltage within a set period of time, the charging target voltage is adjusted to the difference between the pre-charging voltage and a sixth set value.

8. A vehicle electrical system, comprising a charging port, a battery pack, a boost circuit connected between the charging port and the battery pack, and a charging controller for controlling the boost circuit, wherein the charging controller is configured to perform the following operations: Determining a charging mode based on the charging voltage specification of the charging pile and the charging voltage specification of the electric vehicle, wherein the charging mode includes a boost charging mode and a direct charging mode; When the charging mode is determined to be the boost charging mode, the pre-charging voltage and the charging target voltage of the battery pack are determined based on the charging voltage specification of the charging pile and the current voltage of the battery pack, in, The charging voltage specification of the charging pile is determined based on the insulation detection voltage of the charging pile and the maximum output voltage reported by the charging pile.

9. A computer-readable storage medium storing a computer program / instruction, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

10. A computer program product, comprising a computer program / instructions, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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