Vehicle interlock detection device and detection method thereof

Abstract

The present invention discloses a vehicle interlock detection device and a detection method thereof, wherein a microcontroller detects an interlock detection instruction, generates a current input signal based on an interlock signal generation strategy and sends it to a high-voltage connector; the microcontroller receives the current output signal sent by the high-voltage connector, compares it with the current input signal to obtain an interlock detection result and sends it to an isolation chip; the isolation chip performs electrical isolation processing on the interlock detection result, obtains the processed interlock detection result and sends it to a main controller; the main controller receives the processed interlock detection result, and based on the processed interlock detection result and a high-voltage input control strategy, inputs the high voltage connected to the high-voltage connector to an object to be powered. In the embodiment of the present invention, when the microcontroller detects that a high-voltage connector is connected to a high-voltage connector socket, the interlock detection is driven by software, which not only has low implementation cost, but also will not be affected by interference signals to obtain erroneous interlock detection results.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a vehicle interlock detection device and a detection method thereof. Background Art

[0002] The onboard energy source of electric vehicles is a rechargeable battery module. When the battery module needs to be charged, it can be charged in a parking space with charging equipment such as a charging pile. When the user removes the charging gun from the charging pile, because the charging head of the charging gun generally has a charging wire head and will be charged when powered on, in order to improve the safety of the charging process, it is necessary to detect whether the charging gun and the charging port of the electric vehicle are normally connected based on an interlock detection circuit.

[0003] Interlock detection circuits are widely used in electrical control systems to ensure that two or more interrelated devices, components or operations can operate safely and orderly to avoid conflicts or dangerous situations. At present, commonly used interlock detection circuits are generally based on sensor circuits, logic gate circuits, and other combinations. By detecting the state of related signals, control signals are generated according to pre-set logical rules. However, the existing interlock detection circuit is a detection method based on hardware circuits. It is necessary to set up a corresponding interlock detection circuit between two interrelated devices, which not only requires the addition of hardware modules, but also generates erroneous output signals when interfered with and affects the normal operation of subsequent devices. Summary of the invention

[0004] The embodiments of the present invention provide a vehicle interlock detection device and a detection method thereof, aiming to solve the problem in the prior art that the interlock detection circuit is a detection method based on a hardware circuit, and a corresponding interlock detection circuit needs to be set between two interrelated devices, which not only requires the addition of a hardware module, but also generates an erroneous output signal when interfered with and affects the normal operation of subsequent devices.

[0005] In a first aspect, an embodiment of the present invention provides a vehicle interlock detection device, which is arranged on an electric vehicle or a charging device, and the vehicle interlock detection device includes a PCB board, a microcontroller, an isolation chip, a transceiver, a low-voltage connector and a main controller; the microcontroller is arranged on the PCB board; a high-voltage connector socket is also arranged on the PCB board, and the high-voltage connector socket is connected to the microcontroller; the microcontroller is connected to the low-voltage connector through the isolation chip and the transceiver, and the low-voltage connector is communicatively connected to the main controller;

[0006] The microcontroller is used to generate a current input signal based on a preset interlock signal generation strategy when detecting that a high-voltage connector is connected to the high-voltage connector socket and an interlock detection instruction is detected, and send the current input signal to the high-voltage connector;

[0007] The microcontroller is further configured to compare the current output signal with the current input signal when receiving the current output signal sent by the high-voltage connector, obtain a corresponding interlock detection result, and send the interlock detection result to the isolation chip;

[0008] The isolation chip is used to perform electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and send the processed interlock detection result to the main controller through the transceiver and the low-voltage connector in sequence;

[0009] The main controller is used to input the high voltage connected to the high voltage connector to the object to be powered based on the processed interlock detection result and a preset high voltage power input control strategy when receiving the processed interlock detection result.

[0010] In a second aspect, an embodiment of the present invention further provides a vehicle interlock detection method, which is applied to a vehicle interlock detection device, wherein the vehicle interlock detection device is arranged on an electric vehicle or a charging device, and the vehicle interlock detection device comprises a PCB board, a microcontroller, an isolation chip, a transceiver, a low-voltage connector and a main controller; the microcontroller is arranged on the PCB board; a high-voltage connector socket is also arranged on the PCB board, and the high-voltage connector socket is connected to the microcontroller; the microcontroller is connected to the low-voltage connector through the isolation chip and the transceiver, and the low-voltage connector is communicatively connected to the main controller; the vehicle interlock detection method comprises:

[0011] When the microcontroller detects that a high-voltage connector is connected to the high-voltage connector socket and detects an interlock detection instruction, the microcontroller generates a current input signal based on a preset interlock signal generation strategy and sends the current input signal to the high-voltage connector;

[0012] When the microcontroller receives the current output signal sent by the high-voltage connector, the microcontroller compares the current output signal with the current input signal to obtain a corresponding interlock detection result, and sends the interlock detection result to the isolation chip;

[0013] The isolation chip performs electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and sends the processed interlock detection result to the main controller through the transceiver and the low-voltage connector in sequence;

[0014] When receiving the processed interlock detection result, the main controller inputs the high voltage connected to the high voltage connector to the object to be powered based on the processed interlock detection result and a preset high voltage power input control strategy.

[0015] The embodiment of the present invention provides a vehicle interlock detection device and a detection method thereof. The vehicle interlock detection device is arranged on an electric vehicle or a charging device, and the vehicle interlock detection device includes a PCB board, a microcontroller, an isolation chip, a transceiver, a low-voltage connector and a main controller; the microcontroller is arranged on the PCB board; a high-voltage connector socket is also arranged on the PCB board, and the high-voltage connector socket is connected to the microcontroller; the microcontroller is connected to the low-voltage connector through the transceiver, and the low-voltage connector is communicatively connected to the main controller; the microcontroller is used to generate a current input signal based on a preset interlock signal generation strategy when it is detected that a high-voltage connector is connected to the high-voltage connector socket and an interlock detection instruction is detected, and The current input signal is sent to the high-voltage connector; the microcontroller is also used to compare the current output signal with the current input signal when receiving the current output signal sent by the high-voltage connector, obtain the corresponding interlock detection result, and send the interlock detection result to the isolation chip; the isolation chip is used to perform electrical isolation processing on the interlock detection result to obtain the processed interlock detection result, and send the processed interlock detection result to the main controller through the transceiver and the low-voltage connector in sequence; the main controller is used to input the high voltage connected to the high-voltage connector to the object to be powered based on the processed interlock detection result and the preset high-voltage input control strategy when receiving the processed interlock detection result. The embodiment of the present invention drives the interlock detection by software when the microcontroller detects that a high-voltage connector is connected to the high-voltage connector socket, which not only has low implementation cost, but also will not be affected by interference signals to obtain erroneous interlock detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of 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 described below are 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 any creative work.

[0017] Figure 1 A schematic block diagram of the structure of a vehicle interlock detection device provided by an embodiment of the present invention;

[0018] Figure 2 A schematic flow chart of a vehicle interlock detection method provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a sub-process of a vehicle interlock detection method provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a sub-process of a vehicle interlock detection method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] 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 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.

[0022] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0023] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0024] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0025] See also Figure 1 , which is a schematic block diagram of the structure of the vehicle interlock detection device provided by an embodiment of the present invention. Figure 1 As shown, the vehicle interlock detection device is arranged on an electric vehicle or a charging device, and the vehicle interlock detection device includes a PCB board 1, a microcontroller 10, an isolation chip 20, a transceiver 30, a low-voltage connector 40 and a main controller 50; the microcontroller 10 is arranged on the PCB board 1; a high-voltage connector socket 60 is also arranged on the PCB board, and the high-voltage connector socket 60 is connected to the microcontroller 10; the microcontroller 10 is connected to the low-voltage connector 40 through the isolation chip 20 and the transceiver 30, and the low-voltage connector 40 is communicatively connected to the main controller 50;

[0026] The microcontroller 10 is used to generate a current input signal based on a preset interlock signal generation strategy when detecting that a high-voltage connector 61 is connected to the high-voltage connector socket 60 and an interlock detection instruction is detected, and send the current input signal to the high-voltage connector 61;

[0027] The microcontroller 10 is further used to compare the current output signal with the current input signal when receiving the current output signal sent by the high-voltage connector 61, obtain a corresponding interlock detection result, and send the interlock detection result to the isolation chip 20;

[0028] The isolation chip 20 is used to perform electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and send the processed interlock detection result to the main controller 50 through the transceiver 30 and the low-voltage connector 40 in sequence;

[0029] The main controller 50 is used to input the high voltage connected to the high voltage connector to the object to be powered based on the processed interlock detection result and a preset high voltage power input control strategy when receiving the processed interlock detection result.

[0030] In this embodiment, the vehicle interlock detection device has at least the following two usage scenarios when it is implemented. The first scenario is that it is installed in an electric vehicle, that is, the electric vehicle is the host and the charging pile is the slave; the second scenario is that it is installed on a charging pile, that is, the charging pile is the host and the electric vehicle is the slave. In specific implementation, whether the electric vehicle or the charging pile is the host, the detection process is the same. The following takes the specific scenario that the vehicle interlock detection device is installed in an electric vehicle as an example to explain the technical solution in detail.

[0031] When the vehicle interlock detection device is arranged on the electric vehicle (such as arranging the PCB board 1 at a position close to the charging port of the electric vehicle), the high-voltage connector 61 is arranged on the charging head of the charging pile, and at least two high-voltage connector plugs are arranged on the high-voltage connector 61. When the high-voltage connector 61 is plugged into the charging port of the electric vehicle, the charging head of the charging pile connected by the two high-voltage connector plugs cannot be powered on immediately, but needs to be powered on after the interlock detection result of the vehicle interlock detection device is normal, which is also to ensure the safety of the charging process. After the high-voltage connector 61 is plugged into the charging port of the electric vehicle, because the length of its high-voltage connector plug is sufficient to enable it to be plugged into the high-voltage connector socket 60 on the PCB board 1, and the high-voltage connector socket 60 is connected to the microcontroller 10 on the PCB board 1, the high-voltage connector 61 also establishes a communication connection relationship with the microcontroller 10 at this time. Afterwards, in order to detect whether the interlock detection result between the electric vehicle and the charging pile is normal, the microcontroller 10 can perform interlock detection in a software-driven manner at this time. The specific process is as follows:

[0032] 1) When the microcontroller 10 detects an interlock detection instruction, it generates a current input signal based on a preset interlock signal generation strategy, and sends the current input signal to the high-voltage connector 61;

[0033] 2) When the microcontroller 10 receives the current output signal sent by the high-voltage connector 61, it compares the current output signal with the current input signal to obtain a corresponding interlock detection result, and sends the interlock detection result to the isolation chip 20;

[0034] 3) The isolation chip 20 performs electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and sends the processed interlock detection result to the main controller 50 through the transceiver 30 and the low-voltage connector 40 in sequence;

[0035] 4) When the main controller 50 receives the processed interlock detection result, based on the processed interlock detection result and the preset high-voltage power input control strategy, the high voltage input connected to the high-voltage connector is input to the object to be powered; wherein the object to be powered may be a battery module, a compressor, a PTC heater and other high-voltage components.

[0036] It can be seen from the above process that when the interlock detection process of the software-driven mode of the microcontroller 10 needs to be triggered, the microcontroller 10 needs to detect the interlock detection instruction first. In specific implementation, the interlock detection instruction is an instruction generated by the main controller and sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, or an instruction generated by the microcontroller based on a preset interlock detection instruction generation cycle. That is, both the microcontroller 10 itself and the main controller 50 can generate an interlock detection instruction based on the actual interlock detection requirements, thereby triggering the subsequent interlock detection process.

[0037] In the above interlock detection process, first, the microcontroller 10 needs to generate a current input signal based on the interlock signal generation strategy, and send the current input signal to the high-voltage connector 61. This current input signal has no specific signal waveform, duty cycle and other requirements, and can be a signal determined by various custom signal waveforms, duty cycles and other parameters. After the current input signal is transmitted to the high-voltage connector 61, if the high-voltage connector plugs of the high-voltage connector 61 are normally connected to the high-voltage connector plug 60, the high-voltage connector 61 can completely send the current output signal that is unchanged and the same as the current input signal back to the microcontroller 10. Of course, whether the current input signal and the current output signal are exactly the same, it is also necessary to compare them in the microcontroller 10 to obtain the interlock detection result. In the specific implementation, the PCB board 1, the microcontroller 10 and the high-voltage connector plug 60 are arranged in the high-voltage domain of the electric vehicle, and the transceiver 30, the low-voltage connector 40 and the main controller 50 are arranged in the low-voltage domain of the electric vehicle; when the interlock detection result generated in the microcontroller 10 is directly sent to the main controller 50 located in the low-voltage domain of the electric vehicle, some interference signals will be transmitted together, which is not conducive to the subsequent equipment safety of the main controller 50 and the accuracy of signal processing. Between the high-voltage domain and the low-voltage domain of the electric vehicle, the isolation chip 20 is used as an intermediate component, and the isolation chip 20 (such as a magnetic coupling isolation chip, a capacitive coupling isolation chip) first performs electrical isolation processing on the interlock detection result to obtain the processed interlock detection result, and then the processed interlock detection result is sequentially sent to the main controller 50 through the transceiver 30 (such as a LIN communication chip, a CAN communication chip, etc., where LIN stands for Local Interconnect Network and represents a local area Internet, and CAN stands for Controller Area Network and represents a controller local area network communication network) and the low-voltage connector 40. Of course, in the specific implementation, the high-voltage connector plug 60 can also be set in the low-voltage domain of the electric vehicle and connected to the main controller 50. At this time, the interlock detection result can be obtained directly based on the main controller 50 to detect whether the high-voltage connector plug 60 is connected to the high-voltage connector 61. There is no need to first obtain the interlock detection result based on the microcontroller 10 and then process the interlock detection result through the isolation chip 20, the transceiver 30 and the low-voltage connector 40 in sequence, and then transmit it to the main controller 50 for processing and then transmit it back to the microcontroller 10. The main controller 50 directly inputs the high voltage connected to the high-voltage connector to the object to be powered based on the interlock detection result and the preset high-voltage power input control strategy; wherein, the object to be powered can be a battery module, a compressor, a PTC heater and other high-voltage components.

[0038] After receiving the processed interlock detection result, the main controller 50 can first determine whether it is a normal interlock detection result or an abnormal interlock detection result, and then perform corresponding charging control according to whether it is a normal or abnormal interlock detection result. For example, if the interlock detection result is normal, a power-on command can be issued to the charging pile.

[0039] It can be seen that the above process is to drive the interlock detection through software by the microcontroller when detecting that a high-voltage connector is connected to the high-voltage connector socket. It is not only low-cost to implement, but also will not be affected by interference signals to obtain erroneous interlock detection results.

[0040] In one embodiment, if Figure 1 As shown, the high-voltage connector socket 60 includes at least two high-voltage connector jacks (not shown), and the total number of high-voltage connector jacks on the high-voltage connector socket 60 is the same as the total number of high-voltage connector plugs (not shown) provided on the high-voltage connector 61.

[0041] In this embodiment, when a high-voltage connector socket 60 including two high-voltage connector jacks is used, not only is the device easy to obtain, but it can also be easily soldered on the PCB board and connected to the corresponding pins of the microcontroller 10. Moreover, it should be noted during the specific implementation that after the high-voltage connector socket is soldered on the PCB board, when the PCB board is fixed at the charging port of the electric vehicle, the high-voltage connector socket should be as close to the charging port as possible, so that when the charging gun of the charging pile is plugged into the charging port, the high-voltage connector plug of the high-voltage connector on the charging gun can be conveniently plugged into the high-voltage connector socket.

[0042] In one embodiment, the preset interlock signal generation strategy generates the current input signal, including:

[0043] A duty cycle, a frequency, and a waveform type corresponding to the interlock signal generation strategy are acquired, and the current input signal is generated based on the duty cycle, the frequency, and the waveform type.

[0044] In this embodiment, the interlock signal generation strategy can be pre-set in the microcontroller, for example, the duty cycle and the waveform type are pre-set, and then after the interlock detection instruction is detected in the microcontroller, the current input signal is generated based on the duty cycle and the waveform type. Afterwards, the microcontroller can send the current input signal to the high-voltage connector (specifically, first through the high-voltage connector socket, and then transmit the high-voltage connector). If in a specific embodiment, one of the two high-voltage connector plugs of the high-voltage connector is regarded as an input interface, and the other is regarded as an output interface. When the microcontroller can send the current input signal to the high-voltage connector, it is input from the input interface, and then the high-voltage connector outputs the current output signal from the output interface and sends it to the microcontroller. It can be seen that based on the interlock signal generation strategy, various types of customized signals can be flexibly generated for subsequent interlock detection.

[0045] In one embodiment, the comparing the current output signal with the current input signal to obtain a corresponding interlock detection result includes:

[0046] If it is determined that the current output signal is the same as the current input signal, taking the normal interlock detection result as the interlock detection result;

[0047] If it is determined that the current output signal is different from the current input signal, the interlock detection abnormal result is used as the interlock detection result.

[0048] In this embodiment, after the high-voltage connector receives the current input signal, it will quickly detect whether the high-voltage connector itself is normal. If the high-voltage connector is normal, it can reproduce a current output signal without making any changes to the current input signal. When the microcontroller receives the current output signal and determines that the current output signal is the same as the current input signal, the normal result of the interlock detection is used as the interlock detection result. If the high-voltage connector is abnormal, it cannot reproduce the current input signal to obtain a current output signal. When the microcontroller receives the current output signal and determines that the current output signal is not the same as the current input signal, the abnormal result of the interlock detection is used as the interlock detection result. The above two interlock detection results will further affect whether the subsequent main controller issues a normal power-on instruction.

[0049] In one embodiment, based on the processed interlock detection result and the preset high-voltage power input control strategy, the high voltage input connected to the high-voltage connector is input to the object to be powered, including:

[0050] If it is determined that the interlock detection result after the processing is a normal interlock detection result, a normal power-on instruction or a keep-on instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage power-on input connected to the high-voltage connector or keeps the power on normally input to the object to be powered;

[0051] If it is determined that the interlock detection result after processing is an abnormal interlock detection result, a power-off instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage connector to be in a power-off state.

[0052] In this embodiment, the isolation chip performs electrical isolation processing on the interlock detection result to obtain the processed interlock detection result, and after the processed interlock detection result is sent to the main controller through the transceiver and the low-voltage connector in sequence, the main controller can first obtain whether it is a normal interlock detection result (i.e., a normal interlock detection result) or an abnormal interlock detection result (i.e., an abnormal interlock detection result) in the received processed interlock detection result, and then perform corresponding charging control according to whether it is a normal or abnormal interlock detection result. For example, when it is a normal interlock detection result, a normal power-on instruction or a keep-on instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage power-on input connected to the high-voltage connector or keeps the power-on normal input to the object to be powered, and then the high-voltage components (i.e., the object to be powered) such as the battery module, compressor, PTC heater connected to the microcontroller can maintain the previous power-on state, or can be initially powered on at this time when it was not powered on before. For example, when the interlock detection result is abnormal, a power-off instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage connector to be in a power-off state, thereby preventing the high-voltage connector from being powered on and affecting the safety of the power supply object.

[0053] Figure 2 is a flow chart of a vehicle interlock detection method provided by an embodiment of the present invention, such as Figure 2 As shown, the present invention also provides a vehicle interlock detection method, which is applied to a vehicle interlock detection device, and the vehicle interlock detection device is arranged on an electric vehicle or a charging device. Figure 1 As shown, the vehicle interlock detection device includes a PCB board 1, a microcontroller 10, an isolation chip 20, a transceiver 30, a low-voltage connector 40 and a main controller 50; the microcontroller 10 is arranged on the PCB board 1; a high-voltage connector socket 60 is also arranged on the PCB board, and the high-voltage connector socket 60 is connected to the microcontroller 10; the microcontroller 10 is connected to the low-voltage connector 40 through the isolation chip 20 and the transceiver 30, and the low-voltage connector 40 is connected to the main controller 50 for communication. Figure 2 As shown, the vehicle interlock detection method includes steps S110 to S140.

[0054] S110, when the microcontroller detects that a high-voltage connector is connected to the high-voltage connector socket and detects an interlock detection instruction, the microcontroller generates a current input signal based on a preset interlock signal generation strategy, and sends the current input signal to the high-voltage connector;

[0055] S120, when the microcontroller receives the current output signal sent by the high-voltage connector, the microcontroller compares the current output signal with the current input signal to obtain a corresponding interlock detection result, and sends the interlock detection result to the isolation chip;

[0056] S130, the isolation chip performs electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and sends the processed interlock detection result to the main controller through the transceiver and the low-voltage connector in sequence;

[0057] S140. When the main controller receives the processed interlock detection result, based on the processed interlock detection result and a preset high-voltage power input control strategy, the high voltage input connected to the high-voltage connector is input to the object to be powered.

[0058] In this embodiment, the vehicle interlock detection device has at least the following two usage scenarios when it is implemented. The first scenario is that it is installed in an electric vehicle, that is, the electric vehicle is the host and the charging pile is the slave; the second scenario is that it is installed on a charging pile, that is, the charging pile is the host and the electric vehicle is the slave. In specific implementation, whether the electric vehicle or the charging pile is the host, the detection process is the same. The following takes the specific scenario that the vehicle interlock detection device is installed in an electric vehicle as an example to explain the technical solution in detail.

[0059] Please continue to refer to Figure 1When the vehicle interlock detection device is arranged on the electric vehicle (such as the PCB board 1 is arranged near the charging port of the electric vehicle), the high-voltage connector 61 is arranged on the charging head of the charging pile, and at least two high-voltage connector plugs are arranged on the high-voltage connector 61. When the high-voltage connector 61 is plugged into the charging port of the electric vehicle, the charging head of the charging pile of the two high-voltage connector plugs cannot be powered on immediately, but needs to be powered on after the interlock detection result of the vehicle interlock detection device is a normal result, which is also to ensure the safety of the charging process. After the high-voltage connector 61 is plugged into the charging port of the electric vehicle, because the length of its high-voltage connector plug is sufficient to enable it to be plugged into the high-voltage connector socket 60 on the PCB board 1, and the high-voltage connector socket 60 is connected to the microcontroller 10 on the PCB board 1, the high-voltage connector 61 also establishes a communication connection relationship with the microcontroller 10 at this time. Afterwards, in order to detect whether the interlock detection result between the electric vehicle and the charging pile is normal, the microcontroller 10 can perform interlock detection in a software-driven manner at this time, and the specific process is as described in the above steps S110~S140.

[0060] In the above interlock detection process, first, the microcontroller 10 needs to generate a current input signal based on the interlock signal generation strategy, and send the current input signal to the high-voltage connector 61. This current input signal has no specific signal waveform, duty cycle and other requirements, and can be a signal determined by various custom signal waveforms, duty cycles and other parameters. After the current input signal is transmitted to the high-voltage connector 61, if the high-voltage connector plugs of the high-voltage connector 61 are normally connected to the high-voltage connector plug 60, the high-voltage connector 61 can completely send the current output signal that is unchanged and the same as the current input signal back to the microcontroller 10. Of course, whether the current input signal and the current output signal are exactly the same, it is also necessary to compare them in the microcontroller 10 to obtain the interlock detection result. In the specific implementation, the PCB board 1, the microcontroller 10 and the high-voltage connector plug 60 are arranged in the high-voltage domain of the electric vehicle, and the transceiver 30, the low-voltage connector 40 and the main controller 50 are arranged in the low-voltage domain of the electric vehicle; when the interlock detection result generated in the microcontroller 10 is directly sent to the main controller 50 located in the low-voltage domain of the electric vehicle, some interference signals will be transmitted together, which is not conducive to the subsequent equipment safety of the main controller 50 and the accuracy of signal processing. Between the high-voltage domain and the low-voltage domain of the electric vehicle, the isolation chip 20 is used as an intermediate component, and the isolation chip 20 (such as a magnetic coupling isolation chip, a capacitive coupling isolation chip) first performs electrical isolation processing on the interlock detection result to obtain the processed interlock detection result, and then the processed interlock detection result is sequentially sent to the main controller 50 through the transceiver 30 (such as a LIN communication chip, a CAN communication chip, etc., where LIN stands for Local Interconnect Network and represents a local area Internet, and CAN stands for Controller Area Network and represents a controller local area network communication network) and the low-voltage connector 40.

[0061] After receiving the processed interlock detection result, the main controller 50 can first obtain whether it is a normal interlock detection result or an abnormal interlock detection result, and then perform corresponding charging control according to whether it is a normal or abnormal interlock detection result. For example, if it is a normal interlock detection result, a power-on command can be issued to the charging pile.

[0062] It can be seen that the above process is to drive the interlock detection through software by the microcontroller when detecting that a high-voltage connector is connected to the high-voltage connector socket. It is not only low-cost to implement, but also will not be affected by interference signals to obtain erroneous interlock detection results.

[0063] In one embodiment, step S110 includes:

[0064] A duty cycle, a frequency, and a waveform type corresponding to the interlock signal generation strategy are acquired, and the current input signal is generated based on the duty cycle, the frequency, and the waveform type.

[0065] In this embodiment, the interlock signal generation strategy can be pre-set in the microcontroller, for example, the duty cycle and the waveform type are pre-set, and then after the interlock detection instruction is detected in the microcontroller, the current input signal is generated based on the duty cycle and the waveform type. Afterwards, the microcontroller can send the current input signal to the high-voltage connector (specifically, first through the high-voltage connector socket, and then transmit the high-voltage connector). If in a specific embodiment, one of the two high-voltage connector plugs of the high-voltage connector is regarded as an input interface, and the other is regarded as an output interface. When the microcontroller can send the current input signal to the high-voltage connector, it is input from the input interface, and then the high-voltage connector outputs the current output signal from the output interface and sends it to the microcontroller. It can be seen that based on the interlock signal generation strategy, various types of customized signals can be flexibly generated for subsequent interlock detection.

[0066] In one embodiment, if Figure 3 As shown, step S120 includes:

[0067] S121, if it is determined that the current output signal is the same as the current input signal, taking the normal interlock detection result as the interlock detection result;

[0068] S122: If it is determined that the current output signal is different from the current input signal, taking the abnormal interlock detection result as the interlock detection result.

[0069] In this embodiment, after the high-voltage connector receives the current input signal, it will quickly detect whether the high-voltage connector itself is normal. If the high-voltage connector is normal, it can reproduce a current output signal without making any changes to the current input signal. When the microcontroller receives the current output signal and determines that the current output signal is the same as the current input signal, the normal result of the interlock detection is used as the interlock detection result. If the high-voltage connector is abnormal, it cannot reproduce the current input signal to obtain a current output signal. When the microcontroller receives the current output signal and determines that the current output signal is not the same as the current input signal, the abnormal result of the interlock detection is used as the interlock detection result. The above two interlock detection results will further affect whether the subsequent main controller issues a normal power-on instruction.

[0070] In one embodiment, if Figure 4 As shown, step S140 includes:

[0071] S141. If it is determined that the interlock detection result after the processing is a normal interlock detection result, a normal power-on instruction or a keep-on instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage power-on input connected to the high-voltage connector or keeps the power on normally input to the object to be powered;

[0072] S142. If it is determined that the interlock detection result after processing is an abnormal interlock detection result, a power-off instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage connector to be in a power-off state.

[0073] In this embodiment, the isolation chip performs electrical isolation processing on the interlock detection result to obtain the processed interlock detection result, and after the processed interlock detection result is sent to the main controller through the transceiver and the low-voltage connector in sequence, the main controller can first obtain whether it is a normal interlock detection result (i.e., a normal interlock detection result) or an abnormal interlock detection result (i.e., an abnormal interlock detection result) in the received processed interlock detection result, and then perform corresponding charging control according to whether it is a normal or abnormal interlock detection result. For example, when it is a normal interlock detection result, a normal power-on instruction or a keep-on instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage power-on input connected to the high-voltage connector or keeps the power-on normal input to the object to be powered, and then the high-voltage components (i.e., the object to be powered) such as the battery module, compressor, PTC heater connected to the microcontroller can maintain the previous power-on state, or can be initially powered on at this time when it was not powered on before. For example, when the interlock detection result is abnormal, a power-off instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage connector to be in a power-off state, thereby preventing the high-voltage connector from being powered on and affecting the safety of the power supply object.

[0074] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0075] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0076] The steps in the method of the embodiment of the present invention can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0077] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.

[0078] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A vehicle interlock detection device, characterized in that: The vehicle interlock detection device is arranged on an electric vehicle or a charging device, and comprises a PCB board, a microcontroller, an isolation chip, a transceiver, a low-voltage connector and a main controller; the microcontroller is arranged on the PCB board; a high-voltage connector socket is also arranged on the PCB board, and the high-voltage connector socket is connected to the microcontroller; the microcontroller is connected to the low-voltage connector through the isolation chip and the transceiver, and the low-voltage connector is communicatively connected to the main controller; The microcontroller is used to generate a current input signal based on a preset interlock signal generation strategy when detecting that a high-voltage connector is connected to the high-voltage connector socket and an interlock detection instruction is detected, and send the current input signal to the high-voltage connector; The microcontroller is further configured to compare the current output signal with the current input signal when receiving the current output signal sent by the high-voltage connector, obtain a corresponding interlock detection result, and send the interlock detection result to the isolation chip; The isolation chip is used to perform electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and send the processed interlock detection result to the main controller through the transceiver and the low-voltage connector in sequence; The main controller is used to input the high voltage connected to the high voltage connector to the object to be powered based on the processed interlock detection result and a preset high voltage power input control strategy when receiving the processed interlock detection result.

2. The vehicle interlock detection device according to claim 1, characterized in that: The preset interlock signal generation strategy generates the current input signal, including: A duty cycle, a frequency, and a waveform type corresponding to the interlock signal generation strategy are acquired, and the current input signal is generated based on the duty cycle, the frequency, and the waveform type.

3. The vehicle interlock detection device according to claim 1, characterized in that: The comparing the current output signal with the current input signal to obtain a corresponding interlock detection result includes: If it is determined that the current output signal is the same as the current input signal, taking the normal interlock detection result as the interlock detection result; If it is determined that the current output signal is different from the current input signal, the interlock detection abnormal result is used as the interlock detection result.

4. The vehicle interlock detection device according to claim 3, characterized in that: Based on the processed interlock detection result and the preset high-voltage power input control strategy, the high voltage input connected to the high-voltage connector is input to the object to be powered, including: If it is determined that the interlock detection result after the processing is a normal interlock detection result, a normal power-on instruction or a keep-on instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage power-on input connected to the high-voltage connector or keeps the power on normally input to the object to be powered; If it is determined that the interlock detection result after processing is an abnormal interlock detection result, a power-off instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage connector to be in a power-off state.

5. The vehicle interlock detection device according to claim 1, characterized in that: The interlock detection instruction is an instruction generated by the main controller and sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, or is an instruction generated by the microcontroller based on a preset interlock detection instruction generation cycle.

6. The vehicle interlock detection device according to claim 1, characterized in that: The high-voltage connector socket includes at least two high-voltage connector jacks, and the total number of the high-voltage connector jacks on the high-voltage connector socket is the same as the total number of high-voltage connector plugs provided on the high-voltage connector.

7. A vehicle interlock detection method, characterized in that: Applicable to a vehicle interlock detection device, the vehicle interlock detection device is arranged on an electric vehicle or a charging device, and the vehicle interlock detection device comprises a PCB board, a microcontroller, an isolation chip, a transceiver, a low-voltage connector and a main controller; the microcontroller is arranged on the PCB board; a high-voltage connector socket is also arranged on the PCB board, and the high-voltage connector socket is connected to the microcontroller; the microcontroller is connected to the low-voltage connector through the isolation chip and the transceiver, and the low-voltage connector is communicatively connected to the main controller; The vehicle interlock detection method comprises: When the microcontroller detects that a high-voltage connector is connected to the high-voltage connector socket and detects an interlock detection instruction, the microcontroller generates a current input signal based on a preset interlock signal generation strategy and sends the current input signal to the high-voltage connector; When the microcontroller receives the current output signal sent by the high-voltage connector, the microcontroller compares the current output signal with the current input signal to obtain a corresponding interlock detection result, and sends the interlock detection result to the isolation chip; The isolation chip performs electrical isolation processing on the interlock detection result to obtain a processed interlock detection result, and sends the processed interlock detection result to the main controller through the transceiver and the low-voltage connector in sequence; When receiving the processed interlock detection result, the main controller inputs the high voltage connected to the high voltage connector to the object to be powered based on the processed interlock detection result and a preset high voltage power input control strategy.

8. The method according to claim 7, characterized in that The preset interlock signal generation strategy generates the current input signal, including: A duty cycle, a frequency, and a waveform type corresponding to the interlock signal generation strategy are acquired, and the current input signal is generated based on the duty cycle, the frequency, and the waveform type.

9. The method according to claim 7, characterized in that: The comparing the current output signal with the current input signal to obtain a corresponding interlock detection result includes: If it is determined that the current output signal is the same as the current input signal, taking the normal interlock detection result as the interlock detection result; If it is determined that the current output signal is different from the current input signal, the interlock detection abnormal result is used as the interlock detection result.

10. The method according to claim 9, characterized in that Based on the processed interlock detection result and the preset high-voltage power input control strategy, the high voltage input connected to the high-voltage connector is input to the object to be powered, including: If it is determined that the interlock detection result after the processing is a normal interlock detection result, a normal power-on instruction or a keep-on instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage power-on input connected to the high-voltage connector or keeps the power on normally input to the object to be powered; If it is determined that the interlock detection result after processing is an abnormal interlock detection result, a power-off instruction is generated as a target control instruction based on the high-voltage power input control strategy, and the target control instruction is sent to the microcontroller through the low-voltage connector, the transceiver and the isolation chip in sequence, so that the microcontroller controls the high-voltage connector to be in a power-off state.

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