Pre-charging detection method, device and storage medium for vehicle and on-board charger thereof

Abstract

The present invention provides a pre-charging detection method, device and storage medium for a vehicle and an on-board charger thereof. The pre-charging detection method comprises: in response to a received charging instruction, collecting a first voltage on the AC side of the power grid; after reaching a first set time, collecting a second voltage of the capacitor; judging whether the capacitor has completed pre-charging according to the first voltage and the second voltage; when the capacitor has not completed pre-charging, collecting a third voltage of the capacitor after waiting for a second set time; judging whether the capacitor has completed pre-charging according to the first voltage and the third voltage; when the capacitor has not completed pre-charging, reporting capacitor pre-charging fault information; when the capacitor has completed pre-charging, closing the main relay to start the on-board charger. The present invention can increase the probability of charging and enhance the user's charging experience.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle charging technology, and in particular to a pre-charging detection method, device and storage medium for a vehicle and an on-board charger thereof. Background Art

[0002] The on-board charger is an important device for new energy vehicles that converts the AC power of the power grid into DC power to charge the power battery. Because there are bulk capacitors on the bulk bus inside the on-board charger, the on-board charger needs to pre-charge the bulk capacitors before starting to prevent the on-board charger from generating a large impact current when starting, which may cause the charger to over-current protection and thus fail to charge normally.

[0003] At present, when precharging bulk capacitors, the success of precharging is mainly determined by judging whether the voltage across the precharged bulk capacitor reaches a predetermined voltage value. However, affected by the grid voltage, if the grid voltage harmonics are too large, the predetermined voltage value may not be reached within the specified time, resulting in precharging failure, which increases the possibility of failure to charge normally. Summary of the invention

[0004] In view of the above problems, the object of the present invention is to provide a pre-charging detection method, device and storage medium for a vehicle and its on-board charger, which can effectively improve the charging probability of the on-board charger and enhance the user's charging experience.

[0005] In a first aspect, an embodiment of the present invention provides a pre-charging detection method for an on-board charger, the on-board charger comprising: a pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, the first end of the main relay and the pre-charging resistor being used to access the AC side of a power grid, the second end of the main relay and the pre-charging resistor being connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit being used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit being respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter being respectively connected to the two ends of the capacitor, the first output end and the second output end of the LLC converter being used to be connected to the two ends of an output capacitor;

[0006] The pre-charge detection method comprises:

[0007] In response to the received charging instruction, collecting a first voltage on the AC side of the power grid;

[0008] After the first set time is reached, collecting the second voltage of the capacitor;

[0009] determining whether the capacitor has completed pre-charging according to the first voltage and the second voltage;

[0010] When the capacitor has not completed pre-charging, after waiting for a second set time, collecting a third voltage of the capacitor;

[0011] determining whether the capacitor has completed pre-charging according to the first voltage and the third voltage;

[0012] When the capacitor is not pre-charged, reporting capacitor pre-charge failure information;

[0013] When the capacitor is pre-charged, the main relay is closed to start the on-board charger.

[0014] As an improvement of the above solution, judging whether the capacitor has completed pre-charging according to the first voltage and the second voltage includes:

[0015] Calculating a first pre-charge threshold value according to the first voltage, a preset compensation value and a preset first voltage deviation value;

[0016] comparing the second voltage to the first precharge threshold;

[0017] When the second voltage is greater than the first pre-charging threshold, it is determined that the capacitor has completed pre-charging;

[0018] When the second voltage is less than or equal to the first pre-charging threshold, it is determined that the capacitor has not completed pre-charging.

[0019] As an improvement of the above solution, judging whether the capacitor has completed pre-charging according to the first voltage and the third voltage includes:

[0020] Calculating a second pre-charge threshold value according to the first voltage, a preset compensation value and a preset second voltage deviation value; wherein the second voltage deviation value is greater than the first voltage deviation value;

[0021] comparing the third voltage with the second precharge threshold;

[0022] When the third voltage is greater than the second pre-charging threshold, it is determined that the capacitor has completed pre-charging;

[0023] When the third voltage is less than or equal to the second pre-charging threshold, it is determined that the capacitor has not completed pre-charging.

[0024] As an improvement of the above solution, when the capacitor is not pre-charged, after reporting the capacitor pre-charge fault information, the method further includes:

[0025] In response to the received capacitor pre-charging fault information, a fault light of the vehicle instrument is illuminated to indicate a charging fault.

[0026] As an improvement of the above solution, the first pre-charge threshold is calculated according to the first voltage, the preset compensation value and the preset first voltage deviation value, including:

[0027] According to formula (1), the first pre-charge threshold is calculated;

[0028] V1=V rms *kn (1)

[0029] Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and n represents a preset first voltage deviation value.

[0030] As an improvement of the above solution, the second pre-charge threshold is calculated according to the first voltage, the preset compensation value and the preset second voltage deviation value, including:

[0031] According to formula (2), the second pre-charge threshold is calculated;

[0032] V2=V rms *km (2)

[0033] Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and m represents a preset second voltage deviation value.

[0034] As an improvement of the above solution, the first voltage deviation value is 30V, the second voltage deviation value is 50V, and the compensation value is 1.414.

[0035] In a second aspect, an embodiment of the present invention provides a pre-charging detection device for an on-board charger, the on-board charger comprising: a pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, the first end of the main relay and the pre-charging resistor being used to access the AC side of the power grid, the second end of the main relay and the pre-charging resistor being connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit being used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit being respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter being respectively connected to the two ends of the capacitor, and the first output end and the second output end of the LLC converter being used to be connected to the two ends of the output capacitor;

[0036] The pre-fill detection device comprises:

[0037] A first voltage acquisition module, configured to acquire a first voltage on the AC side of the power grid in response to a received charging instruction;

[0038] A second voltage acquisition module, used for acquiring a second voltage of the capacitor after a first set time is reached;

[0039] A first judging module, configured to judge whether the capacitor has completed pre-charging according to the first voltage and the second voltage;

[0040] A third voltage acquisition module, used for acquiring a third voltage of the capacitor after waiting for a second set time when the capacitor has not completed pre-charging;

[0041] A second judging module, configured to judge whether the capacitor has completed pre-charging according to the first voltage and the third voltage;

[0042] A fault reporting module, used for reporting capacitor pre-charging fault information when the capacitor is not pre-charged;

[0043] The closing module is used to close the main relay to start the on-board charger when the capacitor is pre-charged.

[0044] In a third aspect, an embodiment of the present invention provides a vehicle, comprising an on-board charger, the on-board charger comprising: a pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, the first end of the main relay and the pre-charging resistor being used to access the AC side of a power grid, the second end of the main relay and the pre-charging resistor being connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit being used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit being respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter being respectively connected to the two ends of the capacitor, the first output end and the second output end of the LLC converter being used to be connected to the two ends of an output capacitor; the vehicle further comprises a pre-charging detection device, the pre-charging detection device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the pre-charging detection method of the on-board charger as described in any one of the first aspects is implemented.

[0045] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the pre-charging detection method of the on-board charger as described in any one of the first aspects.

[0046] Compared with the prior art, the beneficial effects of the embodiments of the present invention are: by responding to the received charging instruction, the first voltage of the AC side of the power grid is collected; after reaching the first set time, the second voltage of the capacitor is collected; according to the first voltage and the second voltage, whether the capacitor has completed precharging is determined; when the capacitor has not completed precharging, after waiting for the second set time, the third voltage of the capacitor is collected; according to the first voltage and the third voltage, whether the capacitor has completed precharging is determined; when the capacitor has not completed precharging, the capacitor precharging fault information is reported; when the capacitor has completed precharging, the main relay is closed to start the on-board charger. By waiting for the second set time after the initial judgment of precharging failure, the precharging judgment is performed again, thereby preventing the situation that the capacitor inside the on-board charger cannot complete precharging when the first set time is reached due to power grid quality deviation and power grid harmonics causing the power grid peak to be low, thereby increasing the power grid conditions for the normal startup of the on-board charger, thereby increasing the probability of the on-board charger being chargeable, and improving the user's charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a circuit diagram of the vehicle-mounted charger provided by the present invention;

[0049] Figure 2 is a flow chart of a pre-charging detection method of a vehicle charger provided by a first embodiment of the present invention;

[0050] Figure 3 is an overall flow chart of a pre-charge detection method provided by a first embodiment of the present invention;

[0051] Figure 4 is a schematic diagram of a pre-charging detection device for a load charger provided by a second embodiment of the present invention;

[0052] Figure 5 It is a schematic diagram of a pre-charging detection device for a load charger provided in accordance with a third embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0055] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] See also Figure 1 , which is a circuit diagram of a vehicle charger provided by an embodiment of the present invention, the vehicle charger comprises: a pre-charging resistor R, a main relay K, a PFC main power circuit 1, an LLC converter 2 and a capacitor C1, the first end of the main relay K and the pre-charging resistor R is used to access the AC side of the power grid, the second end of the main relay K and the pre-charging resistor R is connected to the first input end of the PFC main power circuit 1, the second input end of the PFC main power circuit 1 is used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit 1 are respectively connected to the two ends of the capacitor C1; the first input end and the second input end of the LLC converter 2 are respectively connected to the two ends of the capacitor C1, and the first output end and the second output end of the LLC converter 2 are used to connect to the two ends of the output capacitor C2. Wherein, the capacitor C1 is a BULK capacitor.

[0057] It should be noted that the PFC main power circuit 1 and the LLC converter 2 belong to the prior art in this field and will not be described here in detail. As the front stage, the PFC main power circuit 1 can convert the AC voltage input from the AC side of the power grid into a stable high-voltage DC voltage, such as 400V, and then the LLC converter 2, as the back stage, converts the DC voltage into the DC voltage required by the output capacitor C2 (the vehicle's power battery), thereby realizing the charging of the power battery. A BULK capacitor is set between the PFC main power circuit 1 and the LLC converter 2. Before the on-board charger is started, the BULK capacitor is pre-charged to prevent the on-board charger from generating a large impact current when starting, thereby causing overcurrent protection of the on-board charger. After the pre-charging is completed, the BULK capacitor is started, the main relay K is closed, and the on-board charger performs power conversion to charge the power battery.

[0058] See also Figure 2 , which is a flow chart of a pre-charging detection method of an on-board charger provided by a first embodiment of the present invention, the pre-charging detection method of the on-board charger comprising:

[0059] S1: In response to a received charging instruction, collecting a first voltage on the AC side of the power grid;

[0060] The charging instruction may be issued by a mobile terminal, a remote control request of a vehicle, or issued by a charging pile after the vehicle is connected to the charging pile. After receiving the charging instruction, the on-board charger collects the grid voltage on the AC side of the grid through a voltage sampling circuit as the first voltage. The voltage sampling circuit belongs to the prior art in this field and is not specifically limited here.

[0061] S2: After the first set time is reached, collecting the second voltage of the capacitor;

[0062] S3: judging whether the capacitor is pre-charged according to the first voltage and the second voltage;

[0063] S4: when the capacitor has not completed pre-charging, after waiting for a second set time, collecting a third voltage of the capacitor;

[0064] S5: judging whether the capacitor is pre-charged according to the first voltage and the third voltage;

[0065] S6: When the capacitor is not pre-charged, reporting capacitor pre-charge failure information;

[0066] S7: When the capacitor is pre-charged, the main relay is closed to start the on-board charger.

[0067] It should be noted that the pre-charge detection method described in the embodiment of the present invention is executed by a control device, which can be a hardware controller with data processing function configured separately for the vehicle, or an integrated functional module in the vehicle controller VCU. The execution process and results of the control device can be displayed on the central control screen of the vehicle, or indirectly communicate and interact with the user's mobile terminal.

[0068] In an embodiment of the invention, after receiving the first set time of the charging instruction, it is initially determined whether the capacitor inside the on-board charger has completed pre-charging according to the second voltage across the capacitor inside the on-board charger and the first voltage on the AC side of the power grid; if the first-level determination shows that the capacitor has not completed pre-charging, the pre-charging continues, and when the second set time is reached after the first set time, it is determined again whether the capacitor inside the on-board charger has completed pre-charging according to the third voltage across the capacitor inside the on-board charger and the first voltage on the AC side of the power grid, thereby preventing the situation where the capacitor inside the on-board charger cannot be pre-charged when the first set time is reached due to power grid quality deviation and power grid harmonics causing the power grid peak to be low, thereby increasing the power grid conditions for the normal startup of the on-board charger, thereby increasing the probability that the on-board charger can be charged, and improving the user's charging experience. At the same time, the safety of the on-board charger can be guaranteed through the two-stage pre-charging judgment procedure.

[0069] In an optional embodiment, judging whether the capacitor has completed pre-charging according to the first voltage and the second voltage includes:

[0070] Calculating a first pre-charge threshold value according to the first voltage, a preset compensation value and a preset first voltage deviation value;

[0071] Further, according to formula (1), the first pre-charge threshold is calculated;

[0072] V1=V rms *kn (1)

[0073] Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and n represents a preset first voltage deviation value.

[0074] comparing the second voltage to the first precharge threshold;

[0075] When the second voltage is greater than the first pre-charging threshold, it is determined that the capacitor has completed pre-charging;

[0076] When the second voltage is less than or equal to the first pre-charging threshold, it is determined that the capacitor has not completed pre-charging.

[0077] In an optional embodiment, judging whether the capacitor has completed pre-charging according to the first voltage and the third voltage includes:

[0078] Calculating a second pre-charge threshold value according to the first voltage, a preset compensation value and a preset second voltage deviation value; wherein the second voltage deviation value is greater than the first voltage deviation value;

[0079] Further, according to formula (2), the second pre-charge threshold is calculated;

[0080] V2=V rms *km (2)

[0081] Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and m represents a preset second voltage deviation value.

[0082] comparing the third voltage with the second precharge threshold;

[0083] When the third voltage is greater than the second pre-charging threshold, it is determined that the capacitor has completed pre-charging;

[0084] When the third voltage is less than or equal to the second pre-charging threshold, it is determined that the capacitor has not completed pre-charging.

[0085] Exemplarily, the value range of the first set time is between 2s and 4s, and the value range of the second set time is between 8s and 10s. In an embodiment of the present invention, the first set time is set to 2s, and the second set time is set to 8s, that is, the first-level pre-charging judgment of step S3 is performed 2s after receiving the charging instruction. If it is judged that the pre-charging is not completed, the second-level pre-charging judgment of step S5 is performed after waiting for 8 seconds. If the pre-charging is not completed at the first level, a secondary judgment with an 8s delay is added, and the pre-charging judgment condition is reduced from the first pre-charging threshold to the second pre-charging threshold, so as to prevent the situation where the pre-charging cannot be completed within 2s due to poor grid quality, increase the grid conditions for the normal start-up of the on-board charger, increase the probability of charging, and improve the user's charging experience.

[0086] In an optional embodiment, the first voltage deviation value is 30V, the second voltage deviation value is 50V, and the compensation value is 1.414.

[0087] It should be noted that the user can set the first voltage deviation value, the second voltage deviation value, and the compensation value to other values ​​according to actual needs, and no specific limitation is made here.

[0088] For example, Figure 3 As shown, after receiving the charging instruction, wait for 2 seconds and determine the second voltage Vbus2 >V rms *1.414-30V; if yes, close the relay, if no, wait for 8s and judge the third voltage V bus3 >V rms *1.414-50V; if yes, close the relay, if not, the on-board charger goes into fault mode and reports a capacitor pre-charge fault.

[0089] In an optional embodiment, when the capacitor is not pre-charged, after reporting the capacitor pre-charge failure information, the method further includes:

[0090] In response to the received capacitor pre-charging fault information, a fault light of the vehicle instrument is illuminated to indicate a charging fault.

[0091] Exemplarily, when the capacitor pre-charging inside the on-board charger fails and reports the capacitor pre-charging fault, the fault light of the vehicle instrument is turned on to prompt the user to perform a charging system test.

[0092] Compared with the prior art, the beneficial effect of the embodiment of the present invention is that: the on-board charger collects the first voltage on the AC side of the power grid when receiving the charging instruction; after the first set time of receiving the charging instruction, collects the second voltage across the capacitor inside the on-board charger, and initially judges whether the capacitor inside the on-board charger has completed pre-charging based on the second voltage and the first voltage on the AC side of the power grid; if the first stage judges that the capacitor has not completed pre-charging, then continue to pre-charge, and when the second set time is reached after the first set time, collect the third voltage across the capacitor inside the on-board charger, and judge again whether the capacitor inside the on-board charger has completed pre-charging based on the third voltage and the first voltage on the AC side of the power grid, thereby preventing the situation that the capacitor inside the on-board charger cannot be pre-charged when the first set time is reached due to power grid quality deviation and power grid harmonics. The power grid conditions for normal startup of the on-board charger are increased, thereby increasing the probability of the on-board charger being chargeable and improving the user's charging experience.

[0093] See also Figure 4The second embodiment of the present invention provides a pre-charging detection device for a vehicle charger, the vehicle charger comprising: a pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, the first end of the main relay and the pre-charging resistor is used to access the AC side of the power grid, the second end of the main relay and the pre-charging resistor is connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit is used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit are respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter are respectively connected to the two ends of the capacitor, and the first output end and the second output end of the LLC converter are used to connect to the two ends of the output capacitor;

[0094] The pre-fill detection device comprises:

[0095] A first voltage acquisition module 1, used for acquiring a first voltage on the AC side of the power grid in response to a received charging instruction;

[0096] A second voltage acquisition module 2, used for acquiring a second voltage of the capacitor after a first set time has elapsed;

[0097] A first judging module 3, used for judging whether the capacitor has completed pre-charging according to the first voltage and the second voltage;

[0098] A third voltage acquisition module 4 is used for acquiring a third voltage of the capacitor after waiting for a second set time when the capacitor has not completed pre-charging;

[0099] A second judgment module 5, used for judging whether the capacitor has completed pre-charging according to the first voltage and the third voltage;

[0100] A fault reporting module 6, used for reporting capacitor pre-charging fault information when the capacitor is not pre-charged;

[0101] The closing module 7 is used to close the main relay to start the on-board charger when the capacitor is pre-charged.

[0102] In an optional embodiment, the first determining module 3 includes:

[0103] a first pre-charge threshold value calculation unit, configured to calculate a first pre-charge threshold value according to the first voltage, a preset compensation value and a preset first voltage deviation value;

[0104] The first comparison unit is used to compare the second voltage with the first pre-charge threshold; when the second voltage is greater than the first pre-charge threshold, it is determined that the capacitor has completed pre-charging; when the second voltage is less than or equal to the first pre-charge threshold, it is determined that the capacitor has not completed pre-charging.

[0105] In an optional embodiment, the second judgment module 5 includes:

[0106] a second pre-charge threshold value calculation unit, configured to calculate a second pre-charge threshold value according to the first voltage, a preset compensation value, and a preset second voltage deviation value; wherein the second voltage deviation value is greater than the first voltage deviation value;

[0107] The second comparison unit is used to compare the third voltage with the second pre-charge threshold; when the third voltage is greater than the second pre-charge threshold, it is determined that the capacitor has completed pre-charging; when the third voltage is less than or equal to the second pre-charge threshold, it is determined that the capacitor has not completed pre-charging.

[0108] In an optional embodiment, the pre-fill detection device further includes:

[0109] The fault light lighting module is used to light up the fault light of the vehicle instrument in response to the received capacitor pre-charging fault information to prompt the charging fault.

[0110] In an optional embodiment, the first pre-filling threshold value calculation unit is used to calculate the first pre-filling threshold value according to formula (1);

[0111] V1=V rms *kn (1)

[0112] Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and n represents a preset first voltage deviation value.

[0113] In an optional embodiment, the second pre-filling threshold value calculation unit is used to calculate the second pre-filling threshold value according to formula (2);

[0114] V2=V rms *km (2)

[0115] Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and m represents a preset second voltage deviation value.

[0116] In an optional embodiment, the first voltage deviation value is 30V, the second voltage deviation value is 50V, and the compensation value is 1.414.

[0117] It should be noted that the principle and technical effect of the pre-filling detection device described in the embodiment of the present invention are the same as those of the pre-filling detection method described in the first embodiment, and will not be repeated here.

[0118] See also Figure 5The third embodiment of the present invention provides a vehicle, including an on-board charger 200, the on-board charger 100 includes: a pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, the first end of the main relay and the pre-charging resistor is used to access the AC side of the power grid, the second end of the main relay and the pre-charging resistor is connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit is used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit are respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter are respectively connected to the two ends of the capacitor, and the first output end and the second output end of the LLC converter are used to connect to the two ends of the output capacitor; the vehicle also includes a pre-charging detection device 100, the pre-charging detection device 100 includes at least one processor 11, such as a CPU, at least one network interface 14 or other user interface 13, a memory 15, and at least one communication bus 12, the communication bus 12 is used to realize the connection and communication between these components. Among them, the user interface 13 can optionally include a USB interface and other standard interfaces and a wired interface. The network interface 14 may optionally include a Wi-Fi interface and other wireless interfaces. The memory 15 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory. The memory 15 may optionally include at least one storage device located away from the aforementioned processor 11.

[0119] In some embodiments, the memory 15 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

[0120] Operating system 151, including various system programs for implementing various basic services and processing hardware-based tasks;

[0121] Procedure 152.

[0122] Specifically, the processor 11 is used to call the program 152 stored in the memory 15 to execute the pre-charge detection method of the on-board charger described in the above embodiment, for example Figure 2 Step S1 is shown. Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are implemented, such as the first voltage acquisition module.

[0123] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program in the pre-charging detection device of the on-board charger.

[0124] The pre-charge detection device of the on-board charger can be a computing device such as VCU, ECU, BMS, etc. The pre-charge detection device of the on-board charger can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the schematic diagram is only an example of the pre-charge detection device of the on-board charger, and does not constitute a limitation on the pre-charge detection device of the on-board charger, and may include more or fewer components than shown in the figure, or combine certain components, or different components.

[0125] The processor 11 may be a microcontroller unit (MCU) central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 11 is the control center of the pre-charge detection device of the on-board charger, and uses various interfaces and lines to connect various parts of the pre-charge detection device of the entire on-board charger.

[0126] The memory 15 can be used to store the computer program and / or module, and the processor 11 realizes various functions of the pre-charge detection device of the on-board charger by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory 15 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 15 can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0127] Among them, if the module / unit integrated in the pre-charge detection device of the on-board charger is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0128] A fourth embodiment of the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the pre-charging detection method of the on-board charger as described in any one of the first embodiments.

[0129] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0130] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A pre-charge detection method for an on-board charger, the on-board charger comprising: A pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, wherein the first ends of the main relay and the pre-charging resistor are used to access the AC side of the power grid, the second ends of the main relay and the pre-charging resistor are connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit is used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit are respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter are respectively connected to the two ends of the capacitor, and the first output end and the second output end of the LLC converter are used to connect to the two ends of the output capacitor; characterized in that The pre-charge detection method comprises: In response to the received charging instruction, collecting a first voltage on the AC side of the power grid; After the first set time is reached, collecting the second voltage of the capacitor; determining whether the capacitor has completed pre-charging according to the first voltage and the second voltage; When the capacitor has not completed pre-charging, after waiting for a second set time, collecting a third voltage of the capacitor; determining whether the capacitor has completed pre-charging according to the first voltage and the third voltage; When the capacitor is not pre-charged, reporting capacitor pre-charge failure information; When the capacitor is pre-charged, the main relay is closed to start the on-board charger.

2. The pre-charging detection method of the on-board charger according to claim 1, characterized in that: The determining, according to the first voltage and the second voltage, whether the capacitor has completed pre-charging includes: Calculating a first pre-charge threshold value according to the first voltage, a preset compensation value and a preset first voltage deviation value; comparing the second voltage to the first precharge threshold; When the second voltage is greater than the first pre-charging threshold, it is determined that the capacitor has completed pre-charging; When the second voltage is less than or equal to the first pre-charging threshold, it is determined that the capacitor has not completed pre-charging.

3. The pre-charging detection method of the on-board charger according to claim 2, characterized in that: The determining, according to the first voltage and the third voltage, whether the capacitor has completed pre-charging includes: Calculating a second pre-charge threshold value according to the first voltage, a preset compensation value and a preset second voltage deviation value; wherein the second voltage deviation value is greater than the first voltage deviation value; comparing the third voltage with the second precharge threshold; When the third voltage is greater than the second pre-charging threshold, it is determined that the capacitor has completed pre-charging; When the third voltage is less than or equal to the second pre-charging threshold, it is determined that the capacitor has not completed pre-charging.

4. The pre-charging detection method of the on-board charger according to claim 1, characterized in that: When the capacitor is not pre-charged, after reporting the capacitor pre-charge failure information, the method further includes: In response to the received capacitor pre-charging fault information, a fault light of the vehicle instrument is illuminated to indicate a charging fault.

5. The pre-charging detection method of the on-board charger according to claim 2, characterized in that: The calculating the first pre-charge threshold value according to the first voltage, a preset compensation value and a preset first voltage deviation value includes: According to formula (1), the first pre-charge threshold is calculated; V1=V rms *kn (1) Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and n represents a preset first voltage deviation value.

6. The pre-charging detection method of the on-board charger according to claim 3, characterized in that: The calculating the second pre-charge threshold value according to the first voltage, a preset compensation value and a preset second voltage deviation value includes: According to formula (2), the second pre-charge threshold is calculated; <h2 style=";text-align:left;direction:ltr">V2=V<h2 style=";text-align:left;direction:ltr"> rms <h2 style=";text-align:left;direction:ltr"> *km (2) Among them, V rms represents the first voltage on the AC side of the power grid, k represents a preset compensation value, and m represents a preset second voltage deviation value.

7. The pre-charging detection method of the on-board charger according to claim 3, characterized in that: The first voltage deviation value is 30V, the second voltage deviation value is 50V, and the compensation value is 1.

414.

8. A pre-charging detection device for an on-board charger, the on-board charger comprising: A pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, wherein the first ends of the main relay and the pre-charging resistor are used to access the AC side of the power grid, the second ends of the main relay and the pre-charging resistor are connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit is used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit are respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter are respectively connected to the two ends of the capacitor, and the first output end and the second output end of the LLC converter are used to connect to the two ends of the output capacitor; characterized in that The pre-fill detection device comprises: A first voltage acquisition module, configured to acquire a first voltage on the AC side of the power grid in response to a received charging instruction; A second voltage acquisition module, used for acquiring a second voltage of the capacitor after a first set time is reached; A first judging module, configured to judge whether the capacitor has completed pre-charging according to the first voltage and the second voltage; A third voltage acquisition module, used for acquiring a third voltage of the capacitor after waiting for a second set time when the capacitor has not completed pre-charging; A second judging module, configured to judge whether the capacitor has completed pre-charging according to the first voltage and the third voltage; A fault reporting module, used for reporting capacitor pre-charging fault information when the capacitor is not pre-charged; The closing module is used to close the main relay to start the on-board charger when the capacitor is pre-charged.

9. A vehicle, comprising an on-board charger, the on-board charger comprising: A pre-charging resistor, a main relay, a PFC main power circuit, an LLC converter and a capacitor, wherein the first ends of the main relay and the pre-charging resistor are used to access the AC side of the power grid, the second ends of the main relay and the pre-charging resistor are connected to the first input end of the PFC main power circuit, the second input end of the PFC main power circuit is used to access the AC side of the power grid, the first output end and the second output end of the PFC main power circuit are respectively connected to the two ends of the capacitor; the first input end and the second input end of the LLC converter are respectively connected to the two ends of the capacitor, and the first output end and the second output end of the LLC converter are used to be connected to the two ends of the output capacitor; characterized in that the vehicle also includes a pre-charging detection device, the pre-charging detection device includes a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the pre-charging detection method of the on-board charger as described in any one of claims 1-7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the pre-charging detection method for the on-board charger according to any one of claims 1 to 7.

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