Charging control method and device and vehicle

Abstract

The invention discloses a charging control method and device and a vehicle, and the method comprises the steps: monitoring a first voltage at a charging port when a charging device is connected with the charging port of the vehicle and carries out the insulation detection; and determining an output voltage range of the charging equipment according to the first voltage. Therefore, the voltage platform specification of the charging equipment is judged and identified in advance.

Description

Technical Field

[0001] The present application relates to the field of charging, and more specifically to a charging control method and device, and a vehicle. Background Art

[0002] As the market share of new energy vehicles increases year by year, the endurance of electric vehicles has always been a difficult problem that new energy vehicle manufacturers need to solve urgently. As a fast way to replenish energy for electric vehicles, the DC charging function has received widespread attention in the charging of new energy vehicles. At present, the DC charging standard for new energy vehicles is GB / T27930-2015 "Communication Protocol between Off-board Conductive Chargers and Battery Management Systems for Electric Vehicles". However, in the relevant technology, electric vehicles need to transmit vehicle identification information messages (BRM) and power battery charging parameter messages (BCP) to the charger before they can obtain the charger's maximum output capacity message (CML) sent by the charger and identify the charger's voltage specifications, which results in the electric vehicle learning the charger's voltage specifications later. Summary of the invention

[0003] The present application is proposed to solve at least one of the above problems. According to a first aspect of the present application, a charging control method is provided, the charging control method comprising: when a charging device is connected to a charging port of a vehicle and insulation detection is performed, monitoring a first voltage at the charging port; and determining an output voltage range of the charging device according to the first voltage.

[0004] In one embodiment of the present application, when the charging device is connected to the charging port of the vehicle and insulation detection is performed, the first voltage at the charging port is monitored, including: after receiving a charger handshake message sent by the charging device, real-time monitoring of the first voltage at the charging port.

[0005] In one embodiment of the present application, determining the output voltage range of the charging device based on the first voltage includes: before receiving the identification signal request message sent by the charging device, if the first voltage is not less than a first set voltage value for a duration not less than a first set duration, then determining that the output voltage range of the charging device is a first voltage range.

[0006] In one embodiment of the present application, determining the output voltage range of the charging device based on the first voltage also includes: before receiving the identification signal request message sent by the charging device, if the duration for which the first voltage is not less than a first set voltage value is less than the first set duration, then determining that the output voltage range of the charging device is a second voltage range.

[0007] In one embodiment of the present application, the first set voltage value is the smaller value of the first reference value and the second reference value; wherein the first reference value is equal to the maximum allowable charging voltage value of the vehicle's on-board battery minus the allowable charging voltage difference; and the second reference value is determined based on the first voltage range and the voltage drop of the internal wires of the charging device.

[0008] In one embodiment of the present application, the charging control method further includes: determining, according to an output voltage range of the charging device, a current battery voltage of the vehicle battery in a battery charging parameter message sent to the charging device.

[0009] In one embodiment of the present application, determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device based on the output voltage range of the charging device includes: if the output voltage range of the charging device is a first voltage range, then using the current actual battery voltage of the vehicle battery as the current battery voltage of the vehicle battery; wherein the upper limit value of the first voltage range is not less than the current actual battery voltage of the vehicle battery.

[0010] In one embodiment of the present application, determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device based on the output voltage range of the charging device includes: if the output voltage range of the charging device is a second voltage range, using a second set voltage value as the current battery voltage of the vehicle battery; wherein the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery, and the second set voltage value is within the second voltage range.

[0011] In one embodiment of the present application, the charging control method further includes: if the charging port does not support the currently connected charging device to charge the vehicle's on-board battery, sending a charger voltage mismatch fault message.

[0012] In one embodiment of the present application, the charging control method also includes: when the output voltage range of the charging device is a second voltage range, if the charging port cannot be connected to the vehicle battery through the boost circuit, it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery of the vehicle; wherein the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery.

[0013] In one embodiment of the present application, the charging control method also includes: after the charging device completes the insulation detection and the discharge voltage in sequence, monitoring the second voltage at the charging port; if the second voltage meets the pre-charging prerequisite, executing the pre-charging of the pre-charging device connected to the charging port by the vehicle's on-board battery.

[0014] In one embodiment of the present application, after the charging device completes the insulation detection and the discharge voltage in sequence, monitoring the second voltage at the charging port includes: after receiving the charger maximum output capacity message sent by the charging device and determining that the charging port supports the currently connected charging device to charge the vehicle battery, monitoring the second voltage at the charging port.

[0015] In one embodiment of the present application, after the charging device completes the insulation detection and the discharge voltage in sequence, monitoring the second voltage at the charging port includes: after receiving an identification signal feedback message sent by the charging device, monitoring the second voltage at the charging port; wherein the identification signal feedback message is sent by the charging device to the vehicle based on receiving a battery charging parameter message sent by the vehicle.

[0016] In one embodiment of the present application, if the second voltage does not meet the pre-charging prerequisite, a voltage abnormality fault message of the charging port is issued.

[0017] In one embodiment of the present application, the pre-charging prerequisite includes: during the monitoring process of the second set time length, the duration for which the second voltage is less than the third set voltage value is not less than the third set time length; wherein the third set time length is not greater than the second set time length.

[0018] In one embodiment of the present application, the pre-charging of the pre-charging device connected to the charging port by the on-board battery of the vehicle includes: when the charging port needs to charge the on-board battery through a boost circuit, using the pre-charging capacitor in the boost circuit as the pre-charging device, and controlling the on-board battery and the pre-charging capacitor to be connected so that the on-board battery pre-charges the pre-charging capacitor; within a fourth set time of pre-charging the pre-charging capacitor by the on-board battery, if the duration of the first preset condition being satisfied between the voltage of the pre-charging capacitor and the current battery voltage of the on-board battery in the battery charging parameter message is not less than a fifth set time, it is determined that the pre-charging of the pre-charging capacitor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the fifth set time is not greater than the fourth set time.

[0019] In one embodiment of the present application, within the fourth set time period of pre-charging the pre-charge capacitor by the vehicle battery, if the duration for which the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery satisfy the first preset condition is less than the fifth set time period, a pre-charging failure fault message is issued.

[0020] In one embodiment of the present application, the first preset condition includes: the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charge capacitor, and the ratio of the current battery voltage of the vehicle battery to the current battery voltage of the vehicle battery is less than or equal to a first set proportional coefficient; wherein the first set proportional coefficient is greater than zero and less than or equal to 0.1; or, the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charge capacitor is less than or equal to a first set voltage threshold.

[0021] In one embodiment of the present application, the execution of pre-charging of the vehicle's on-board battery to the pre-charging device connected to the charging port includes: when the charging port does not need to charge the vehicle-mounted battery through a boost circuit, using a pre-charging resistor electrically connected to the charging port as the pre-charging device, and controlling the on-board battery and the charging port to be conductive through the pre-charging resistor, so that the on-board battery pre-charges the pre-charging resistor; within a sixth set time of pre-charging the pre-charging resistor by the on-board battery, if the duration of the second preset condition between the voltage at the charging port and the current battery voltage of the on-board battery in the battery charging parameter message is not less than a seventh set time, it is determined that the pre-charging of the pre-charging resistor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the seventh set time is not greater than the sixth set time.

[0022] In one embodiment of the present application, within the sixth set time period of pre-charging the pre-charging resistor by the vehicle battery, if the duration for which the voltage at the charging port and the current battery voltage of the vehicle battery satisfy the second preset condition is less than the seventh set time period, a pre-charging failure fault message is issued.

[0023] In one embodiment of the present application, the second preset condition includes: the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage at the charging port, and the ratio of the current battery voltage of the vehicle battery is less than or equal to a second set proportional coefficient; wherein the second set proportional coefficient is greater than zero and less than or equal to 0.1; or, the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage at the charging port is less than or equal to a second set voltage threshold.

[0024] According to the second aspect of the present application, a charging control device is also provided, which includes: a storage medium and a processor, wherein the storage medium stores a computer program executed by the processor, and when the computer program is executed by the processor, the processor executes any one of the above-mentioned charging control methods.

[0025] According to a third aspect of the present application, a vehicle is also provided, comprising: a charging port and any one of the above-mentioned charging control devices.

[0026] According to the charging control method and its device and vehicle provided in the embodiments of the present application, when the charging device is connected to the charging port of the vehicle and insulation detection is performed, the first voltage at the charging port is actively monitored; and based on the first voltage, the output voltage range of the charging device is determined, thereby judging and identifying the voltage platform specifications of the charging device in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0028] Figure 1 This is a flow chart of a charging control method according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of a circuit topology of a DC dual charging circuit according to an embodiment of the present invention;

[0030] Figure 3 This is a flow chart of a charging control method according to another embodiment of the present invention;

[0031] Figure 4 Based on Figure 2 The control flow chart of the DC boost circuit when precharging is shown;

[0032] Figure 5 Based on Figure 2 The control flow chart of the direct current circuit shown in FIG.

[0033] Figure 6 The present invention is a schematic block diagram of a charging control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0035] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0036] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0037] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms of "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, confirm the existence of the features, integers, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items. In order to thoroughly understand the present invention, a detailed structure will be proposed in the following description to illustrate the technical solution proposed by the present invention. Optional embodiments of the present invention are described in detail as follows, but in addition to these detailed descriptions, the present invention can also have other implementation methods.

[0038] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] First, an application scenario of the charging control method illustrated in the example of the present application is introduced. The charging control method is applied to the interactive control process after the charging device and the charging port of the vehicle are connected together and before the charging device charges the vehicle's on-board battery.

[0040] refer to Figure 1 , an embodiment of the present application provides a charging control method, the charging control method comprising:

[0041] Step 1: When the charging device is connected to the charging port of the vehicle and insulation testing is performed, a first voltage at the charging port is monitored;

[0042] Step 2: Determine the output voltage range of the charging device according to the first voltage.

[0043] In the above scheme, when the charging device is connected to the charging port of the vehicle and insulation detection is performed, the first voltage at the charging port is actively monitored; and the output voltage range of the charging device is determined according to the first voltage, so as to judge and identify the voltage platform specification of the charging device in advance. The above steps are described in detail below with reference to the accompanying drawings.

[0044] Exemplary, reference Figure 2 The dual DC charging topology diagram shown includes: M1 buck-boost circuit (i.e., boost circuit), M2 direct connection circuit, M3 control module, M4 power battery (on-board battery). The M1 module includes M5 module relay and M6 buck-boost module. The power battery M4 is connected to the buck-boost circuit M1 and the direct connection circuit M2 through relays K7 and K8. Of course, it should be noted that the charging control method shown in the embodiment of the present application is not limited to being based only on Figure 2 The dual DC charging topology shown is used, and other charging topologies can also be used.

[0045] The DC charging port A is connected to the vehicle battery through a boost circuit, so that the DC charging port A can support boost charging and direct charging. The charging circuit of the DC charging port A is the DC charging circuit 1. The DC charging port B is directly connected to the vehicle battery, so that the DC charging port B only supports charging the vehicle battery by direct discharge. Of course, in other embodiments, the DC charging port A and the DC charging port B can use some switch components so that each DC charging port can be configured to charge the vehicle battery through a boost circuit.

[0046] like Figure 2 As shown, charging circuit 1 includes power battery M4 and buck-boost circuit M1. Charging circuit 2 includes power battery M4 and direct circuit M2. Control module M3 is respectively connected to DC charging circuit 1 and DC charging circuit 2, wherein after receiving the charging confirmation signal, control charging circuit 1 and charging circuit 2 to charge power battery M4.

[0047] The control module M3 is an on-board controller with integrated DC charging function, which can be one or more controllers. The control module M3 should contain two sets of independent DC charging control guidance circuits, which can control each stage of DC charging, control the DC charging contactors of the two DC charging circuits, and monitor the voltage of the charging port and the voltage across the pre-charge capacitor C1 in the boost circuit in real time through the charging subnet and the charger. In the judgment process shown below, the prerequisite can be: Figure 2 As shown, relays K7 and K8 are closed, and relay K9 is open.

[0048] First, refer to Figure 1, when the charging device is connected to the charging port of the vehicle and performs insulation detection, the first voltage at the charging port is monitored. Exemplarily, after the charging gun on the charging device is plugged into the charging port on the vehicle, the charging device will perform insulation detection. During the insulation detection process of the charging device, the vehicle end of the present application actively monitors the first voltage at the charging port connected to the charging device, so as to facilitate the subsequent determination of the output voltage range of the charging device according to the monitored first voltage, thereby determining the voltage platform specification of the charging device. Exemplarily, the output voltage range of the charging device can be a value, for example, the output voltage range of the charging device can be 750V or 500V. Of course, in other embodiments, the output voltage range of the charging device can be a voltage range segment, for example, the output voltage range of the charging device can be a voltage range segment such as 700V~800V, 650V~850V, 450V~550V, 400V~600V, etc. Since there are mainly two charging voltage specifications of 500V and 750V in the current domestic DC charging facilities, the output voltage range of the charging device can include a first voltage range and a second voltage range. Among them, the first voltage range can be a charging voltage specification of 750V, and the second voltage range can be a charging voltage specification of 500V.

[0049] Exemplarily, the first voltage at the charging port may be monitored after the charging device completes handshake with the charging port of the vehicle. Figure 3 When the charging device is connected to the charging port of the vehicle and insulation detection is performed, the following method can be used to monitor the first voltage at the charging port: upon receiving the charger handshake message (such as Figure 3 The CHM in the figure represents a charger handshake message sent by the charging device to the vehicle, which message only contains the communication protocol version number), and then the first voltage at the charging port is monitored in real time. Of course, in other embodiments, refer to Figure 3 , you can also use the following method: send a vehicle handshake message (such as Figure 3 The BHM in the figure indicates the vehicle handshake message sent by the vehicle to the charger, which only contains the maximum allowed total charging voltage. After that, the first voltage at the charging port is monitored in real time. Figure 3 Since the protocol stipulates that the start time of the insulation test of the charging device is after the charging device receives the BHM sent by the vehicle, in the embodiment shown in the above application, the first voltage at the charging port can be actively monitored in advance, thereby ensuring that the voltage monitoring at the charging port connected to the charging device has been started when the charging device performs insulation test.

[0050] Next, refer to Figure 1, according to the first voltage, determine the output voltage range of the charging device. That is, according to the first voltage at the charging port monitored when the charging device performs insulation detection, determine the output voltage range of the charging device, so as to judge and identify the voltage platform specification of the charging device in advance. Compared with the related art, only after the electric vehicle transmits the vehicle identification information message (BRM) and the power battery charging parameter message (BCP) message to the charger, can the charger maximum output capacity message (CML) sent by the charger be obtained, thereby identifying the voltage specification of the charger. The present application can obtain the output voltage specification of the charging device during or after the insulation detection of the charging device.

[0051] Exemplarily, when determining the output voltage range of the charging device according to the first voltage, referring to Figure 3 , upon receiving the identification signal request message (such as Figure 3 CRM SPN 2560=0x00 in the signal identification request message indicates that before the first voltage at the charging port is monitored to be not less than the first set voltage value and the duration of the voltage is not less than the first set duration, it means that the lower limit value of the output voltage range of the charging device must be not less than the first set voltage value, and the output voltage range of the charging device is determined to be the first voltage range.

[0052] Exemplarily, when determining the output voltage range of the charging device according to the first voltage, referring to Figure 3 , if before receiving the identification signal request message sent by the charging device, if the duration of the first voltage at the charging port being not less than the first set voltage value is less than the first set duration, the output voltage range of the charging device is determined to be the second voltage range. That is, if before receiving the identification signal request message sent by the charging device, the duration of the first voltage at the charging port being not less than the first set voltage value is not less than the first set duration, it means that the upper limit value of the output voltage range of the charging device must be less than the first set voltage value, and the output voltage range of the charging device is determined to be the second voltage range.

[0053] When determining the above-mentioned first set voltage value, multiple determination methods can be used. Exemplarily, the first set voltage value can be the smaller value of the first reference value and the second reference value. The first reference value is equal to the maximum allowable charging voltage value of the vehicle's onboard battery minus the allowable charging voltage difference; the second reference value is determined based on the first voltage range and the voltage drop of the internal wire of the charging device.

[0054] Exemplarily, the charging control method may further include: determining a battery charging parameter message (such as Figure 3The BCP in the message represents the current battery voltage of the vehicle battery in the battery charging parameter message). In the related art, when the vehicle sends a battery charging parameter message to the charging device, the vehicle does not yet know the output voltage range of the charging device, so the current actual battery voltage of the vehicle battery is directly used as the current battery voltage of the vehicle battery in the BCP. Compared with the method in the related art where the current battery voltage of the vehicle battery in the battery charging parameter message sent by the vehicle to the charging device is directly the current actual battery voltage of the vehicle battery, in this embodiment of the present application, the current actual battery voltage of the vehicle battery is not directly used as the current battery voltage of the vehicle battery in the BCP, but the current battery voltage of the vehicle battery in the BCP sent to the charging device is determined according to the output voltage range of the charging device.

[0055] When determining the current battery voltage of the vehicle-mounted battery in the battery charging parameter message sent to the charging device specifically according to the output voltage range of the charging device, multiple methods may be used.

[0056] Exemplarily, when determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device, if the output voltage range of the charging device is the first voltage range, the current actual battery voltage of the vehicle battery is used as the current battery voltage of the vehicle battery. Among them, the upper limit value of the first voltage range is not less than the current actual battery voltage of the vehicle battery. This means that the vehicle now knows that the current actual battery voltage of the vehicle battery is within the first voltage range, that is, the charging device can directly charge the vehicle battery at this time, and the vehicle battery can be charged in a direct connection manner without going through a boost circuit.

[0057] Exemplarily, when determining the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device according to the output voltage range of the charging device, if the output voltage range of the charging device is the second voltage range, the second set voltage value is used as the current battery voltage of the vehicle battery. Among them, the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery, and the second set voltage value is within the second voltage range. This means that at this time the vehicle knows that the current actual battery voltage of the vehicle battery is greater than the output voltage range of the charging device. At this time, the charging device cannot directly charge the vehicle battery, but needs to charge the vehicle battery through a boost circuit. However, in order to prevent the charging device from directly judging that the charging device cannot charge the vehicle battery after obtaining the BCP sent by the vehicle and unilaterally stopping the charging process. Therefore, in this embodiment, the vehicle does not use the current actual battery voltage of the vehicle battery as the current battery voltage of the vehicle battery, but uses the second set voltage value as the current battery voltage of the vehicle battery, and the second set voltage value is within the second voltage range, so that after the charging device obtains the BCP sent by the vehicle, it will not directly determine that the charging device cannot charge the vehicle battery and unilaterally stop the charging process.

[0058] For example, Figure 2 and Figure 3 As shown. In the DC charging circuit 1, in the vehicle handshake stage 01-charger voltage platform identification process, after receiving the charger CHM (charger handshake message) message, the vehicle monitors the charging port voltage in the DC charging circuit 1 in real time through the control module M3. The voltage of the charger insulation detection is the vehicle's onboard battery (such as Figure 2 The smaller value (min{Ubhm, Ucml_max}) of the maximum allowable total charging voltage BHM of the power battery M4 in the power battery (the BHM message only includes the "maximum allowable total charging voltage") and the maximum output voltage CMLmax of the charging device is used as the first set voltage value.

[0059] Exemplarily, if the control module M3 detects that the charging port voltage persists for 200ms≥min{Ubhm-20V,745V} before the vehicle receives CRM=0x00, (745V is the second reference value, which can be adjusted considering the voltage drop on the wiring harness inside the charging device. The monitoring time of the first set duration of 200ms can also be adjusted according to actual conditions, then it is considered that the voltage platform capacity of the charging device is greater than or equal to 750V, and then the current battery voltage (SPN2822) value of the vehicle power battery in the BCP power battery charging parameter message sent by the vehicle in the configuration stage sends the actual voltage value of the current vehicle power battery.

[0060] For example, if the voltage value at the charging port detected by the control module M3 does not meet this condition, the current battery voltage (SPN2822) of the vehicle power battery in the BCP power battery charging parameter message sent by the electric vehicle in the subsequent configuration phase is equal to 420V. 420V can be appropriately adjusted according to the minimum output voltage capacity of the actual charger, and the present invention recommends using 420V as the value.

[0061] Exemplarily, the charging control method may further include: if the charging port does not support the currently connected charging device to charge the vehicle's onboard battery, a charger voltage mismatch fault message is sent, so that the user can know the specific fault reason why the charging device cannot charge the vehicle's onboard battery.

[0062] Exemplarily, when determining whether the charging port supports the currently connected charging device to charge the vehicle's on-board battery, not only the relationship between the output voltage range of the charging device and the current actual voltage of the on-board battery is considered, but also the method in which the charging port connected to the charging device is connected to the on-board battery is considered. Exemplarily, the charging port connected to the charging device can be connected to the on-board battery through a boost circuit. At this time, the charging port not only supports charging the on-board battery by direct connection, but also supports charging the on-board battery by boost circuit. Alternatively, the charging port connected to the charging device cannot be connected to the on-board battery through a boost circuit, but is directly connected to the on-board battery. At this time, the on-board battery can only support charging the on-board battery by direct connection.

[0063] Exemplarily, the charging control method may further include: when the output voltage range of the charging device is within the second voltage range, if the charging port cannot be connected to the vehicle battery through the boost circuit, it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery. Among them, the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery. At this time, since the upper limit value of the output voltage range of the charging device is less than the current actual battery voltage of the vehicle battery, the charging device cannot charge the vehicle battery in a direct connection manner. If the charging port connected to the charging device does not support connection with the vehicle battery through the boost circuit, the charging port and the charging device at this time are not matched, then it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery, and a charger voltage mismatch fault message is issued.

[0064] Exemplarily, the charging control method may further include: if the charging port supports the currently connected charging device to charge the vehicle's onboard battery, it means that there will be no charger voltage mismatch fault, and no charger voltage mismatch fault message is sent. Continue to proceed to the pre-charging process.

[0065] Exemplary, reference Figure 2 and Figure 3 In the DC charging circuit 2, when the control module M3 receives the maximum output voltage CML_max of the charger < the actual current battery voltage of the vehicle's power battery M4, the current process is immediately terminated, and the control module M3 internally records the fault "charger voltage mismatch" and sends it to the vehicle's CAN communication network through a CAN message.

[0066] For example, in some embodiments, after the insulation detection and discharge of the charging equipment is completed, the charging circuit of the vehicle can monitor the voltage at the charging port before pre-charging, and judge the voltage at the charging port through specific conditions to ensure that the vehicle meets the pre-charging prerequisite. Even if the vehicle does not meet the pre-charging prerequisite at this time, the cause of the fault can be quickly locked.

[0067] Exemplarily, the charging control method may also include: after the charging device completes insulation detection and discharges the voltage in sequence, monitoring the second voltage at the charging port. If the second voltage meets the pre-charging prerequisite, the vehicle's on-board battery pre-charges the pre-charging device connected to the charging port. Compared with the related art method of directly pre-charging, in this embodiment of the present application, after the charging device completes insulation detection and discharges the voltage in sequence, it also monitors the second voltage at the charging port, and determines whether the second voltage meets the pre-charging prerequisite. Only when the second voltage meets the pre-charging prerequisite, the vehicle's on-board battery pre-charges the pre-charging device connected to the charging port. In some embodiments, if the second voltage does not meet the pre-charging prerequisite, a voltage abnormality fault message of the charging port is issued to facilitate users to know the specific fault reason why the charging device cannot charge the vehicle.

[0068] The timing for monitoring the second voltage at the charging port is determined after the charging device has completed insulation detection and voltage discharge in sequence. In some embodiments, after the charging device has completed insulation detection and voltage discharge in sequence, when the second voltage at the charging port is monitored, the maximum output capacity message of the charger (such as Figure 3 The CML shown indicates the maximum output capability message of the charger) and then monitors the second voltage at the charging port. Of course, in a more preferred embodiment, the second voltage at the charging port can be monitored after receiving the maximum output capability message of the charger sent by the charging device and determining that the charging port supports the currently connected charging device to charge the vehicle battery. If, after receiving the maximum output capability message of the charger sent by the charging device, it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery, the subsequent charging matching process can be terminated directly without pre-charging, so there is no need to monitor the second voltage at the charging port.

[0069] In other embodiments, after the charging device completes the insulation detection and the voltage discharge in sequence, when monitoring the second voltage at the charging port, refer to Figure 3 , after receiving the identification signal feedback message sent by the charging device, the second voltage at the charging port can be monitored. The identification signal feedback message is sent by the charging device to the vehicle based on the battery charging parameter message sent by the vehicle. Figure 3 CRM SPN2560=0xAA in indicates the identification signal feedback message.

[0070] When determining the pre-charge prerequisite, a variety of methods can be used. Exemplarily, the pre-charge prerequisite may include: during the monitoring process of the second set time, the duration of the second voltage being less than the third set voltage value is not less than the third set time. Among them, the third set time is not greater than the second set time. That is, only after the discharge voltage of the charging device reaches a certain level, it is determined that the pre-charge prerequisite is met.

[0071] For example, in Figure 2 and Figure 3 In DC charging circuit 1 and DC charging circuit 2, when the vehicle receives the charger CML "charger maximum output capacity message", the control module M3 immediately executes Figure 3 In 02-Charging port voltage judgment, start to judge the second voltage at the DC charging port for a maximum of 2s. If the voltage of the DC charging port is less than 60V within 2s and lasts for 100ms (where 2S timing and 100ms duration can be adjusted according to actual conditions), stop timing and immediately execute the following steps: Figure 3 Otherwise, when the timing ends, the control module M3 ends the DC charging process and records the fault code "DC charging port voltage abnormality".

[0072] In other embodiments, Figure 3 The starting condition of 02-charging port voltage judgment in the above embodiment can be adjusted. In the above embodiment, after the vehicle receives the charger CML "charger maximum output capacity message", the control module M3 immediately executes 02-charging port voltage judgment. In this embodiment, it can be replaced by after the vehicle receives the charger CRM SPN2560=0xAA, the control module M3 immediately executes the following Figure 3 02-Charging port voltage judgment.

[0073] In addition, when the vehicle battery pre-charges the pre-charging device connected to the charging port, the pre-charging device can be determined according to the type of charging circuit between the charging port and the vehicle battery. For example, when the output voltage range of the charging device is relatively high, so that the charging port can be directly connected to the vehicle battery to charge the vehicle battery, the pre-charging device at this time is a pre-charging resistor (for example, Figure 2 R1 in the figure represents a pre-charge resistor electrically connected to the charging port). When the output voltage range of the charging device is relatively low, so that the charging port needs to be connected to the vehicle battery through a boost circuit to charge the vehicle battery, the pre-charge device at this time is a pre-charge capacitor in the boost circuit (for example, Figure 2 C1 in the figure represents a pre-charge capacitor electrically connected to the charging port). In some embodiments, it is also possible to determine whether the DC pre-charge of the vehicle is successful by using specific conditions.

[0074] Exemplarily, when the vehicle's on-board battery pre-charges the pre-charge device connected to the charging port, when the charging port needs to charge the vehicle-mounted battery through a boost circuit, the pre-charge capacitor in the boost circuit is used as a pre-charge device, and the on-board battery and the pre-charge capacitor are controlled to be turned on, so that the on-board battery pre-charges the pre-charge capacitor. Within the fourth set time of the on-board battery pre-charging the pre-charge capacitor, if the duration of the first preset condition between the voltage of the pre-charge capacitor and the current battery voltage of the on-board battery in the battery charging parameter message is not less than the fifth set time, it is determined that the pre-charging of the pre-charge capacitor is completed. Among them, the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the fifth set time is not greater than the fourth set time. Exemplarily, the fourth set time can be 2s, 3s, etc. The fifth set time can be 20ms, 300ms, etc.

[0075] In other embodiments, within the fourth set time period of the vehicle battery precharging the pre-charge capacitor, if the duration of the first preset condition between the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery is less than the fifth set time period, a pre-charge failure fault message is issued, so that the user can know that the pre-charge failure causes the charging device to be unable to charge the vehicle battery.

[0076] When determining the first preset condition, a variety of methods may be used. Exemplarily, the first preset condition may include: the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charge capacitor, and the ratio between the current battery voltage of the vehicle battery is less than or equal to a first set proportional coefficient; wherein the first set proportional coefficient is greater than zero and less than or equal to 0.1, and specifically, the first set proportional coefficient may be 0.03, 0.05, etc.

[0077] In some embodiments, within the fourth set time period of the vehicle battery precharging the pre-charge capacitor, if the duration of the first preset condition between the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery in the battery charging parameter message reaches a fifth set time period, it is determined that the pre-charging of the pre-charge capacitor is completed. The fifth set time period may be 200ms, 300ms, etc.

[0078] Exemplary, reference Figure 2 , Figure 3 and Figure 4 In the DC charging circuit 1, after the control module M3 sends BROSPN2829=0x00, the buck-boost module M6 controls the upper bridge arms VT5, VT3, and VT1 to turn on, and turns off the lower bridge arms VT6, VT4, and VT2. Then the control module M3 pulls in K1 in the module relay M5 to start precharging the precharge capacitor C1 in the boost circuit. After K1 is pulled in, the control module M3 starts to make a voltage judgment for a maximum of 2s. If there is a voltage that lasts for 200ms:

[0079]

[0080] After 2S timing and 200ms duration can be adjusted according to actual conditions, the control module M3 considers that the DC pre-charging is successful. The control module M3 immediately controls the module relay M5 to pull in K2, and then delays 100ms to pull in K3 (100ms can be adjusted according to actual conditions). Otherwise, the control module M3 ends the current process, records the fault "DC pre-charging failure" internally, and sends it to the vehicle's CAN communication network through a CAN message.

[0081] Of course, in other embodiments, the first preset condition may also include: the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charge capacitor is less than or equal to the first set voltage threshold. The first set voltage threshold may be 20V. It should be noted that the 20V voltage is the recommended value of the present invention, and the actual value may be appropriately increased or decreased.

[0082] For example, in Figure 4 In the first preset condition in , for DC charging circuit 1, it can be replaced by:

[0083] |Current power battery voltage in BCP - C1 capacitor voltage|≤20V

[0084] For example, when the vehicle battery pre-charges the pre-charging device connected to the charging port, when the charging port does not need to charge the vehicle battery through the boost circuit, the pre-charging resistor electrically connected to the charging port can be used as the pre-charging device (for example, Figure 2R1 in it represents a pre-charging resistor electrically connected to the charging port), and controls the conduction between the vehicle battery and the charging port through the pre-charging resistor, so that the vehicle battery pre-charges the pre-charging resistor. Within the sixth set time of the vehicle battery pre-charging the pre-charging resistor, if the duration of the second preset condition between the voltage at the charging port and the current battery voltage of the vehicle battery in the battery charging parameter message is not less than the seventh set time, it is determined that the pre-charging of the pre-charging resistor is completed. Among them, the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the seventh set time is not greater than the sixth set time. Exemplarily, the sixth set time can be 2s, 3s, etc. The seventh set time can be 200ms, 300ms, etc.

[0085] In other embodiments, within the sixth set time period of the vehicle battery pre-charging the pre-charging resistor, if the duration of the second preset condition between the voltage at the charging port and the current battery voltage of the vehicle battery is less than the seventh set time period, a pre-charging failure fault message is issued, so that the user can know that the pre-charging failure causes the charging device to be unable to charge the vehicle battery.

[0086] When determining the second preset condition, multiple methods can be used. Exemplarily, the second preset condition may include: the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage at the charging port, and the ratio between the current battery voltage of the vehicle battery is less than or equal to the second set proportional coefficient; wherein the second set proportional coefficient is greater than zero and less than or equal to 0.1. Specifically, the second set proportional coefficient may be 0.03, 0.05, etc.

[0087] In some embodiments, within the sixth set time of the vehicle battery pre-charging the pre-charge capacitor, if the duration of the second preset condition between the voltage at the charging port and the current battery voltage of the vehicle battery in the battery charging parameter message reaches a seventh set time, it is determined that the pre-charging of the pre-charge resistor is completed. The seventh set time may be 200ms, 300ms, etc.

[0088] Exemplary, reference Figure 2 , Figure 3 and Figure 5 In the DC charging circuit 2, after the control module M3 sends BROSPN2829=0x00, the control module M3 first controls the relay K6 to be energized, and 100ms later the control module M3 controls the relay K5 to be energized (100ms can be adjusted according to the actual situation). After the relay K5 is energized, the control module M3 starts to perform a voltage judgment for a maximum of 2s. If the voltage continues for 200ms and meets the following conditions:

[0089]

[0090] After 2S timing and 200ms duration can be adjusted according to actual conditions, the control module M3 considers that the DC pre-charging is successful. The control module M3 immediately controls the relay K4 to pull in, and then disconnects K6 after a delay of 100ms (100ms can be adjusted according to actual conditions). Otherwise, the control module M3 ends the current process, records the fault "DC pre-charging failure" internally, and sends it to the vehicle CAN communication network through a CAN message.

[0091] Of course, in other embodiments, the second preset condition may also include: the absolute value of the difference between the current battery voltage of the vehicle battery and the voltage at the charging port is less than or equal to the second set voltage threshold. The second set voltage threshold may be 20V. It should be noted that the 20V voltage is the recommended value of the present invention, and the actual value may be appropriately increased or decreased.

[0092] For example, in Figure 5 The second preset condition in , for the DC charging circuit 2, can be replaced by:

[0093] |Current power battery voltage in BCP - charging port voltage|≤20V

[0094] Exemplary, reference Figure 2 The above charging port can be a DC charging port, and the charging device can be a DC charging device. The above charging port mainly refers to the charging port that is plugged in and connected to the charging device. Figure 2 In the dual DC charging port shown, the above-mentioned charging port is a charging port in the dual DC charging port that has been plugged and connected to the charging gun of the charging device. Of course, in other embodiments, the above-mentioned charging port can also be an AC charging port, and the charging device at this time can be an AC charging device. Of course, since the vehicle battery needs to be charged with DC, it is necessary to add an AC-to-DC circuit between the charging port and the vehicle battery to convert the AC power input through the charging port into DC power. Afterwards, the direct charging circuit and the boost charging circuit can be adjusted accordingly using the above-mentioned control process.

[0095] It can be seen that the reference Figure 2 and Figure 3When the vehicle's control module M3 identifies the charger voltage platform specification in advance, the control module M3 has different processing strategies for the buck-boost circuit and the direct-connection circuit: ① When the control module M3 identifies that the charger voltage platform connected to the buck-boost circuit is 500V, the charging mode is switched to the boost charging process; ② When the control module M3 identifies that the charger voltage platform connected to the buck-boost circuit is 750V, the charging mode is switched to the direct-connection charging process; ③ When the control module M3 identifies that the charger voltage platform connected to the direct-connection circuit is 500V, a fault message is sent through CAN communication; ④ When the control module M3 identifies that the charger voltage platform connected to the direct-connection circuit is 750V, it is considered that the charger voltage platform specification meets the charging requirements.

[0096] In the various embodiments shown above, when the charging device is connected to the charging port of the vehicle and insulation detection is performed, the first voltage at the charging port is actively monitored; and based on the first voltage, the output voltage range of the charging device is determined, so as to judge and identify the voltage platform specification of the charging device in advance. That is, the vehicle control module judges and identifies the voltage platform specification of the charging device in advance by actively monitoring the voltage value generated at the charging port where the charging device is connected during insulation detection of the charging device. In some of the above embodiments, based on the electric vehicle charging process in the handshake stage and configuration stage of the GB / T 27930-2015 communication protocol, a pre-charging control method under a dual-gun DC charging scheme is proposed. Achieve early identification of the charger voltage specification, controllable pre-charging method and rapid locking of the root cause of the fault.

[0097] Furthermore, an embodiment of the present application also provides a charging control device, which includes: a storage medium and a processor, wherein the storage medium stores a computer program executed by the processor, and when the computer program is executed by the processor, the processor executes any one of the above-mentioned charging control methods.

[0098] Figure 6 FIG. 1 shows a schematic block diagram of a charging control device 100 according to an embodiment of the present application. Figure 6 As shown, the charging control device 100 according to the embodiment of the present application may include a storage medium 110 and a processor 120. The storage medium 110 stores a computer program executed by the processor 120. When the computer program is executed by the processor 120, the processor 120 executes the charging control method according to the embodiment of the present application described above. Those skilled in the art can understand the specific operation of the charging control device 100 deployment device according to the embodiment of the present application in combination with the above content, and for the sake of brevity, it will not be repeated here.

[0099] The storage medium 110 may include, for example, a memory card of a smart phone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0100] Furthermore, an embodiment of the present application also provides a vehicle, which includes: a charging port and any one of the above-mentioned charging control devices.

[0101] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A charging control method, characterized in that: include: When the charging device is connected to the charging port of the vehicle and insulation detection is performed, monitoring a first voltage at the charging port; An output voltage range of the charging device is determined according to the first voltage.

2. The charging control method according to claim 1, characterized in that: When the charging device is connected to the charging port of the vehicle and insulation detection is performed, monitoring a first voltage at the charging port includes: After receiving the charger handshake message sent by the charging device, the first voltage at the charging port is monitored in real time.

3. The charging control method according to claim 1, characterized in that: The step of determining an output voltage range of the charging device according to the first voltage includes: Before receiving the identification signal request message sent by the charging device, if the first voltage is not less than the first set voltage value for a duration not less than the first set duration, it is determined that the output voltage range of the charging device is the first voltage range.

4. The charging control method according to claim 1, characterized in that: The determining the output voltage range of the charging device according to the first voltage further includes: Before receiving the identification signal request message sent by the charging device, if the duration for which the first voltage is not less than a first set voltage value is less than the first set duration, it is determined that the output voltage range of the charging device is a second voltage range.

5. The charging control method according to claim 3 or 4, characterized in that: The first set voltage value is a smaller value of a first reference value and a second reference value; Among them, the first reference value is equal to the maximum allowable charging voltage value of the vehicle's on-board battery minus the allowable charging voltage difference; the second reference value is determined based on the first voltage range and the voltage drop of the internal wires of the charging device.

6. The charging control method according to claim 1, characterized in that: Also includes: According to the output voltage range of the charging device, the current battery voltage of the vehicle-mounted battery in the battery charging parameter message sent to the charging device is determined.

7. The charging control method according to claim 6, characterized in that: The determining, according to the output voltage range of the charging device, the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device comprises: If the output voltage range of the charging device is a first voltage range, the current actual battery voltage of the vehicle battery is used as the current battery voltage of the vehicle battery; wherein the upper limit value of the first voltage range is not less than the current actual battery voltage of the vehicle battery.

8. The charging control method according to claim 7, characterized in that: The determining, according to the output voltage range of the charging device, the current battery voltage of the vehicle battery in the battery charging parameter message sent to the charging device comprises: If the output voltage range of the charging device is a second voltage range, the second set voltage value is used as the current battery voltage of the vehicle battery; wherein the upper limit value of the second voltage range is less than the current actual battery voltage of the vehicle battery, and the second set voltage value is within the second voltage range.

9. The charging control method according to claim 1, characterized in that: Also includes: If the charging port does not support the currently connected charging device to charge the vehicle's onboard battery, a charger voltage mismatch fault message is sent.

10. The charging control method according to claim 9, characterized in that: Also includes: When the output voltage range of the charging device is within the second voltage range, if the charging port cannot be connected to the vehicle battery through the boost circuit, it is determined that the charging port does not support the currently connected charging device to charge the vehicle battery; wherein the upper limit value of the second voltage range is less than the actual current battery voltage of the vehicle battery.

11. The charging control method according to claim 1, characterized in that: Also includes: After the charging device completes the insulation detection and the voltage discharge in sequence, monitoring a second voltage at the charging port; If the second voltage meets the pre-charging prerequisite, the vehicle's onboard battery pre-charges the pre-charging device connected to the charging port.

12. The charging control method according to claim 11, characterized in that: After the charging device sequentially completes the insulation detection and the voltage discharge, monitoring the second voltage at the charging port includes: After receiving the charger maximum output capacity message sent by the charging device and determining that the charging port supports the currently connected charging device to charge the vehicle battery, the second voltage at the charging port is monitored.

13. The charging control method according to claim 11, characterized in that: After the charging device sequentially completes the insulation detection and the voltage discharge, monitoring the second voltage at the charging port includes: After receiving the identification signal feedback message sent by the charging device, the second voltage at the charging port is monitored; wherein the identification signal feedback message is sent by the charging device to the vehicle based on receiving the battery charging parameter message sent by the vehicle.

14. The charging control method according to claim 11, characterized in that: If the second voltage does not meet the pre-charging prerequisite, a voltage abnormality fault message of the charging port is sent.

15. The charging control method according to claim 11, characterized in that: The pre-charge prerequisites include: During the monitoring process of the second set time length, the duration for which the second voltage is less than the third set voltage value is not less than the third set time length; wherein the third set time length is not greater than the second set time length.

16. The charging control method according to claim 11, characterized in that: The method of executing the pre-charging of the pre-charging device connected to the charging port by the vehicle-mounted battery of the vehicle includes: When the charging port needs to charge the vehicle battery through a boost circuit, the pre-charge capacitor in the boost circuit is used as the pre-charge device, and the vehicle battery and the pre-charge capacitor are controlled to be connected so that the vehicle battery pre-charges the pre-charge capacitor; Within the fourth set time length of pre-charging the pre-charge capacitor by the vehicle battery, if the duration for which the first preset condition is satisfied between the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery in the battery charging parameter message is not less than the fifth set time length, it is determined that the pre-charging of the pre-charge capacitor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the fifth set time length is not greater than the fourth set time length.

17. The charging control method according to claim 16, characterized in that: Within the fourth set time period of pre-charging the pre-charge capacitor by the vehicle battery, if the duration for which the voltage of the pre-charge capacitor and the current battery voltage of the vehicle battery satisfy the first preset condition is less than the fifth set time period, a pre-charging failure fault message is issued.

18. The charging control method according to claim 16, characterized in that: The first preset condition includes: The absolute value of the difference between the current battery voltage of the vehicle battery and the voltage of the pre-charge capacitor, and the ratio of the current battery voltage of the vehicle battery are less than or equal to a first set proportional coefficient; wherein the first set proportional coefficient is greater than zero and less than or equal to 0.1; or, An absolute value of a difference between a current battery voltage of the vehicle-mounted battery and a voltage of the pre-charge capacitor is less than or equal to a first set voltage threshold.

19. The charging control method according to claim 11, characterized in that: The method of executing the pre-charging of the pre-charging device connected to the charging port by the vehicle-mounted battery of the vehicle includes: When the charging port does not need to charge the vehicle battery through a boost circuit, a pre-charging resistor electrically connected to the charging port is used as the pre-charging device, and the vehicle battery and the charging port are controlled to be connected through the pre-charging resistor, so that the vehicle battery pre-charges the pre-charging resistor; Within the sixth set time of pre-charging the pre-charging resistor by the vehicle battery, if the duration for which the second preset condition is satisfied between the voltage at the charging port and the current battery voltage of the vehicle battery in the battery charging parameter message is not less than the seventh set time, it is determined that the pre-charging of the pre-charging resistor is completed; wherein the battery charging parameter message is sent by the vehicle to the charging device after receiving the identification signal feedback message sent by the charging device, and the seventh set time is not greater than the sixth set time.

20. The charging control method according to claim 19, characterized in that: Within the sixth set time period of pre-charging the pre-charging resistor by the vehicle battery, if the duration for which the voltage at the charging port and the current battery voltage of the vehicle battery satisfy the second preset condition is less than the seventh set time period, a pre-charging failure fault message is issued.

21. The charging control method according to claim 19, characterized in that: The second preset condition includes: The absolute value of the difference between the current battery voltage of the vehicle battery and the voltage at the charging port, and the ratio of the current battery voltage of the vehicle battery are less than or equal to a second set proportional coefficient; wherein the second set proportional coefficient is greater than zero and less than or equal to 0.1; or, An absolute value of a difference between a current battery voltage of the vehicle-mounted battery and a voltage at the charging port is less than or equal to a second set voltage threshold.

22. A charging control device, characterized in that: include: A storage medium and a processor, wherein the storage medium stores a computer program executed by the processor, and when the computer program is executed by the processor, the processor executes the charging control method according to any one of claims 1 to 21.

23. A vehicle, characterized in that: include: A charging port and a charging control device as claimed in claim 22.

Images