High-voltage interlocking circuit, vehicle high-voltage interlocking detection system and method and electric vehicle

Abstract

The invention relates to the technical field of electric vehicle safety control, and discloses a high-voltage interlocking detection circuit, which comprises a detection module, a first resistor, a plurality of detection resistors and a protection resistor form a resistor series detection circuit; the driving module comprises an adjustable voltage reference and a first triode and outputs a stable current signal to the detection module; the power supply module is used for supplying power to the driving module; the current detection module is used for detecting the detection current flowing through the first resistor. A current type driving module with a similar constant voltage type is realized based on an adjustable voltage reference design, fault diagnosis is carried out by detecting current flowing through a first resistor RS, the anti-interference capability is high, and the circuit is suitable for a long-distance transmission scene; and the state and the fault type of the high-voltage interlocking circuit can be diagnosed, and the production efficiency is improved. The invention further discloses a high-voltage interlocking detection system, a detection method and an electric vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle safety control, and in particular to a high-voltage interlocking circuit, a vehicle high-voltage interlocking detection system and method, and an electric vehicle. Background Art

[0002] Safety technology has always been one of the core technologies of new energy vehicles, and it is also one of the main concerns of new energy vehicle consumers. Obviously, the reliability of the high-voltage circuit is one of the most important concerns in the safety monitoring system of new energy vehicles. The most important monitoring system for the high-voltage circuit is the high-voltage interlocking system. The main function of this system is to detect the on-off status between various high-voltage components (i.e. monitored components) and to detect whether various abnormal conditions occur (such as short low-voltage power supply, short ground). When an abnormal condition occurs, the vehicle controller will power off the vehicle according to the strategy to keep the vehicle in a safe state.

[0003] Existing high-voltage interlocking circuits can be divided into two categories: voltage-type high-voltage interlocking and current-type high-voltage interlocking. Common voltage-type high-voltage interlocking circuits determine whether a high-voltage component is abnormal by comparing the voltage signals at the input and output ends. The signal sources of this type of circuit include a constant voltage source and a PWM signal generator. Since the high-voltage interlocking lines of new energy vehicles are usually long, and voltage signals are more susceptible to interference than current signals, the large voltage in the high-voltage interlocking may affect the voltage-type high-voltage interlocking circuit and affect the accuracy of detection. At the same time, the current-type high-voltage interlocking circuit is good at long-distance fault detection scenarios, has strong anti-interference capabilities, and has high reliability. However, the traditional constant current type high-voltage interlocking circuit has a weak ability to diagnose fault types. Summary of the invention

[0004] One of the purposes of the present invention is to provide a high-voltage interlock detection circuit, a vehicle high-voltage interlock detection system and method, and an electric vehicle to solve the technical problem that the voltage interlock circuit in the prior art cannot take into account both the transmission distance and the diagnosis of the fault type. A constant-voltage current-type high-voltage interlock detection circuit is designed based on an adjustable voltage reference. The circuit is suitable for long-distance detection, has strong signal anti-interference ability, and can identify a variety of fault types, thereby improving the efficiency and accuracy of the vehicle high-voltage interlock detection system.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In some embodiments, a high-voltage interlock detection circuit includes a detection module, including a first resistor, multiple detection resistors and a protection resistor arranged in series in sequence to form a resistor series detection circuit; wherein the multiple detection resistors correspond to multiple components to be detected and the detection resistors are used to be connected in parallel with the plug-in parts of the components to be detected corresponding to them; a driving module, including an adjustable voltage reference and a first transistor; the anode end of the adjustable voltage reference is respectively connected to the power supply and the base of the first transistor, the cathode end is connected to the second end of the detection resistor side of the resistor series detection circuit, and the reference end is connected to the first end of the first resistor side of the resistor series detection circuit; the emitter of the first transistor is connected to the first end of the resistor series detection circuit, the collector is connected to the power supply and a first current limiting resistor is arranged in series on the access line; a power supply module is used to provide power for the driving module; a current detection module is used to detect the detection current flowing through the first resistor.

[0007] In some embodiments, a vehicle high-voltage interlock detection system includes the aforementioned high-voltage interlock detection circuit; a vehicle component to be detected is set corresponding to the detection resistor of the high-voltage interlock circuit, and the plug-in portion of the component to be detected is connected to the high-voltage interlock detection circuit in parallel with the corresponding detection resistor.

[0008] In some embodiments, a detection method for a vehicle high-voltage interlock detection system includes obtaining a current detection current detected by a high-voltage interlock circuit; and determining that a high-voltage interlock fault occurs in the vehicle when the current detection current is not within a safety current threshold interval.

[0009] In some embodiments, a vehicle high-voltage interlock detection device includes a processor and a memory storing program instructions, and the processor is configured to execute the detection method for a vehicle high-voltage interlock detection system as described in claim 12 or 13 when running the program instructions.

[0010] In some embodiments, an electric vehicle includes the aforementioned high-voltage interlock detection circuit; and / or the aforementioned vehicle high-voltage interlock detection system; and / or the aforementioned detection method for the vehicle high-voltage interlock detection system; and / or the aforementioned vehicle high-voltage interlock detection device.

[0011] The high-voltage interlock detection circuit, vehicle high-voltage interlock detection system and method, and electric vehicle provided by the embodiments of the present disclosure can achieve the following technical effects:

[0012] In the disclosed embodiment, the high-voltage interlock detection circuit implements a current-type drive module with a quasi-constant voltage type based on an adjustable voltage reference design, and outputs a stable current signal for the detection module. Fault diagnosis is performed by detecting the current flowing through the first resistor RS, which has strong anti-interference ability and is suitable for long-distance transmission scenarios; and it occupies fewer detection resources and does not need to occupy any resources of high-voltage components. Moreover, the detection current values ​​in the high-voltage interlock safety connection state and the fault state are different, so that the state of the high-voltage interlock circuit and the fault type (for example, open circuit, short ground, short power supply) can be diagnosed, thereby improving production efficiency. At the same time, all circuit modules are integrated into a detection circuit, and there is no need to deploy devices on the components to be detected (for example, the high-voltage components of the vehicle) to assist in detection, nor is there any need for auxiliary detection through CAN communication; and, except for the detection circuit, any disconnection of the components to be detected will not cause system failure, making the high-voltage interlock detection system highly robust. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural block diagram of a high-voltage interlock detection circuit provided in an embodiment of the present disclosure;

[0014] Figure 2 A schematic diagram of a high-voltage interlock detection circuit provided by an embodiment of the present disclosure;

[0015] Figure 3 A schematic diagram of a high-voltage interlock detection circuit provided in an embodiment of the present disclosure;

[0016] Figure 4 A schematic diagram of another high-voltage interlock detection circuit provided in an embodiment of the present disclosure;

[0017] Figure 5 A schematic diagram of another high-voltage interlock detection circuit provided in an embodiment of the present disclosure;

[0018] Figure 6 A schematic diagram of another high-voltage interlock detection circuit provided in an embodiment of the present disclosure;

[0019] Figure 7 A schematic diagram of another high-voltage interlock detection circuit diagram provided by an embodiment of the present disclosure;

[0020] Figure 8 is a schematic diagram of another high-voltage interlock detection circuit diagram provided by an embodiment of the present disclosure;

[0021] Fig. 9 is a structural schematic diagram of another high-voltage interlock detection system provided by an embodiment of the present disclosure;

[0022] Fig.10 A flowchart of a vehicle high-voltage interlock detection method provided by an embodiment of the present disclosure;

[0023] Fig.11 A flowchart of another vehicle high-voltage interlock detection method provided by an embodiment of the present disclosure;

[0024] Fig.12 A schematic diagram of a vehicle high-voltage interlock detection device provided in an embodiment of the present disclosure.

[0025] Reference numerals:

[0026] 100. High-voltage interlock detection circuit; 10. Detection module; 20. Drive module; 21. Adjustable voltage reference; 30. Power supply module; 31. Power supply; 32. Protection circuit unit; 40. First control module; 41. Current detection module. DETAILED DESCRIPTION

[0027] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0030] Unless otherwise stated, the term "plurality" means two or more.

[0031] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0032] Combination Figures 1 to 8As shown, the embodiment of the present disclosure proposes a high-voltage interlock detection circuit 100, including a detection module 10, a driving module 20, a power supply module 30 and a current detection module 41. The detection module 10 includes a first resistor RS, a plurality of detection resistors (R1, R2, ... Rn-1, Rn) and a protection resistor RP5 arranged in series, forming a resistor series detection circuit; wherein the plurality of detection resistors (R1, R2, ... Rn-1, Rn) correspond to a plurality of components to be detected and the detection resistors are used to be connected in parallel with the plug-in parts of the components to be detected corresponding thereto. The driving module 20 includes an adjustable voltage reference 21 and a first transistor Q1; the anode end of the adjustable voltage reference 21 is respectively connected to the power supply and the base of the first transistor Q1, the cathode end is connected to the second end of the detection resistor side of the resistor series detection circuit, and the reference end is connected to the first end of the first resistor RS side of the resistor series detection circuit; the emitter of the first transistor Q1 is connected to the first end of the resistor series detection circuit, the collector is connected to the power supply and the first current limiting resistor RP4 is arranged in series on the access circuit. The power supply module 30 is used to provide power to the driving module 20. The current detection module 41 is used to detect the current flowing through the first resistor RS.

[0033] In the high-voltage interlock detection circuit of the disclosed embodiment, the adjustable voltage reference collects the voltage Vin at both ends of the resistor series detection circuit composed of the first resistor RS, multiple detection resistors (R1, R2, ..., Rn) and the protection resistor RP5, and compares it with the reference voltage Vref inside the adjustable voltage reference, and the error between the two is amplified by the amplifier output to adjust the conductivity of the first transistor Q1, thereby reducing the error between Vin and Vref, and then realizing the voltage stabilization of Vin to Vref. Based on the adjustable voltage reference design, a current-type driving module with a quasi-constant voltage type is realized, and a stable current signal is output for the detection module. Fault diagnosis is performed by detecting the current flowing through the first resistor RS, which has strong anti-interference ability and is suitable for long-distance transmission scenarios; and it occupies less detection resources and does not need to occupy any resources of high-voltage components. The detection module conditions the current signal. When a fault occurs, the detection module will be reconstructed by the fault. Under the premise that the voltage at both ends of the resistance series detection circuit is stable at Vref, the current of the high-voltage interlock loop is adjusted, so that the detection current value in the high-voltage interlock safety connection state and the fault state is different, so that the state of the high-voltage interlock circuit and the fault type (for example, open circuit, short ground, short power supply) can be diagnosed to improve production efficiency.

[0034] In the detection module 10, the first resistor RS can configure the current size of the high-voltage interlock loop and serve as a current sampling resistor. The protection function of the protection resistor RP5 is to prevent the power supply from being directly short-circuited to the ground when the detected component (for example, the vehicle high-voltage component) is short-circuited, and to assist in diagnosing short-to-ground faults.

[0035] In the embodiment of the present disclosure, when multiple components to be detected are in a normal connection state, multiple detection resistors (R1, R2, ... Rn-1, Rn) are short-circuited and in a short-circuit state, and only the first resistor RS and the protection resistor RP5 in the resistor series detection circuit are connected to the detection circuit, such as Figure 3 The circuit diagram in the normal connection state is shown in the figure. At this time, the current I nor =V ref / (RS+RP5). This current is the normal current (safe current).

[0036] Short-to-ground state. When the high-voltage interlock circuit is in the short-to-ground state, the circuit diagram is as follows Figure 4 As shown, the current in the high voltage interlock loop is: I SC =V ref / RS. This current is the short-circuit current.

[0037] Short 12V power supply. When the high voltage interlock circuit is in the short 12V power supply state, the circuit diagram is as follows Figure 5 At this time, the first transistor Q1 (NPN) is fully turned on. Assuming that the transistor voltage drop is zero, the voltage across the first resistor RS is 12V. The current detected at this time is: I SP =0.

[0038] Open circuit: When at least one of the components to be detected in the high-voltage interlock circuit is open circuit, the open circuit current in the high-voltage interlock circuit is: I OC =Vref / (RS+R O +RP5), where R O The sum of the resistance values ​​of the detection resistors corresponding to at least one open-circuited component to be detected. The current detected at this time is the fault current. Figure 6 The circuit diagram shown in Figure 1 is when the nth component to be detected is open circuit. OC n=Vref / (RS+R n +RP5).

[0039] That is, when the detection current is not I nor When the high-voltage interlock fault is detected, the fault type can be determined according to the specific values ​​of different detection currents, such as open circuit fault, short power fault and short ground fault. To detect so many fault types, only one current signal needs to be detected, which does not require too many resources and does not require the deployment of devices on the components to be detected.

[0040] In some embodiments, in the detection module, the resistance values ​​of the multiple detection resistors (R1, R2, ..., Rn) are different. In this embodiment, by setting the resistance values ​​of the multiple detection resistors to be different, when different components to be detected are open circuited and the corresponding detection resistors are connected to the high-voltage interlocking circuit, the open circuit current I OCIn the calculation formula, R O is different, then the open circuit current I OC Therefore, the open circuit position can be determined by detecting the current, thereby quickly locating the position of the disconnected detected component (for example, a vehicle high-voltage component), thereby improving production efficiency.

[0041] For example, when the first component to be detected is open-circuited, the open-circuit current in the high-voltage interlock circuit is: I OC 1=Vref / (RS+R1+RP5). When the second component to be detected is open circuit, the open circuit current in the high voltage interlock circuit is: I OC 2=Vref / (RS+R2+RP5). When the first and second components to be detected are open circuit, the open circuit current in the high voltage interlock circuit is: I OC 12=Vref / (RS+R1+R2+RP5). By analogy, the corresponding open-circuit currents when different components to be detected are open-circuited can be obtained, and the open-circuit position can be determined by detecting the current.

[0042] In this embodiment, the specific resistance values ​​of the multiple detection resistors (R1, R2, . . . , Rn) are not limited and are set according to actual conditions as long as they can distinguish the open circuit current under different fault types.

[0043] In the disclosed embodiment, the driving module 20 is the core module of the high-voltage interlocking circuit, which is responsible for converting the constant voltage power supply output into a constant current signal output, and bears the robustness index of the high-voltage interlocking detection circuit and the system. In the driving module 20, the principle of voltage stabilization of the adjustable voltage reference 21 is to control the conduction degree of the first transistor Q1 by controlling the voltage between the base and the emitter of the first transistor Q1, and to stabilize the voltage across RS, R1, R2, ..., Rn and RP5 by utilizing the linear amplification area of ​​the first transistor. The function of the first current limiting resistor RP4 is to limit the current flowing through the first transistor Q1 to prevent large current from damaging the first transistor Q1.

[0044] In some embodiments, the driving module further includes a second current limiting resistor RP3 connected in series to the connection line between the anode terminal of the adjustable voltage reference 21 and the power supply 31, thereby limiting the current to prevent large current from damaging the adjustable voltage reference 21 source.

[0045] In some embodiments, the driving module further includes a unidirectional current limiting element D1, which is connected in series to the connection line between the emitter of the first transistor Q1 and the first end of the resistor series detection circuit. The function of the unidirectional current limiting element D1 is to prevent the current from flowing back into the power supply module 30 and damaging it when the high-voltage interlock circuit is short-circuited.

[0046] Optionally, the unidirectional current limiting element D1 includes a diode.

[0047] In some embodiments, the current detection module 41 is used to detect the current flowing through the first resistor RS. Specifically, the current detection module 41 adopts an analog-to-digital conversion unit (ADC module).

[0048] In some embodiments, the high voltage interlock detection circuit further includes a first control module 40, the first control module 40 includes a processing unit, and the processing unit is used to obtain the detection current of the current detection module 41. In this embodiment, the current detection module 41 can be integrated into the first control module 40, for example, in combination with Figure 7 As shown, the ADC module integrated into the first control module 40 collects the voltage across the first resistor RS to obtain the current in the high-voltage interlocking loop.

[0049] In the embodiment of the present disclosure, the power supply module 30 is used to provide power to the driving module 20. Figure 2 As shown, the power supply module 30 includes a power supply 31 , the positive electrode of the power supply is connected to the collector of the first transistor Q1 and a first current limiting resistor RP4 is arranged in series on the connection line, and the positive electrode of the power supply is also connected to the anode terminal of the adjustable voltage reference 21 .

[0050] In some embodiments, in combination Figure 8 As shown, the power supply module 30 includes a power supply 31 and a protection circuit unit 32, and the protection circuit unit 32 is connected to the output line on the positive side of the power supply 31, wherein the protection circuit unit has an automatic retry (AutoRetry) function. In this embodiment, the protection circuit unit with the Auto Retry function can be started after detecting a high-voltage interlock fault, thereby cutting off the power supply of the high-voltage interlock detection system and starting the protection function. And after a certain period of time, turn on the power supply again to detect whether there is still an abnormality. If there is still an abnormality, repeat the above operation until no abnormality is detected). Its input power supply can adopt a car-grade 12V power supply, which is suitable for the use scenario of vehicle-mounted electronic equipment. Among them, when the high-voltage interlock detection circuit 100 includes a first control module 40, the first control module 40 is also used to connect to the protection circuit unit 21 to control the operation of the protection circuit according to the detection current. This embodiment adds an Auto Retry protection circuit, and the safety of the system is improved.

[0051] Optionally, the protection circuit unit 21 includes a second triode QP2, a field effect transistor QP1, a third current limiting resistor RP2 and a fourth current limiting resistor RP1. The second triode QP2 includes a second base, a second collector and a second emitter, the second emitter is used for grounding, and the second base is used for connecting to the first control module 40. The field effect transistor QP1 includes a gate, a drain and a source, the drain is used to connect to the positive electrode of the power supply 31, the gate is connected to the second collector, and the source is connected to the driving module 20 as a power output terminal to provide power to the driving module 20. The third current limiting resistor RP2 is connected in series to the connection line connecting the gate and the second collector. The two ends of the fourth current limiting resistor RP1 are respectively connected to the gate and the drain of the field effect transistor QP1. In this embodiment, the second triode QP2, the field effect transistor QP1, the third current limiting resistor RP2 and the fourth current limiting resistor RP1 constitute an Auto Retry circuit, which is controlled by the first control unit 40 (for example, a microprocessor). The second transistor QP2 is used to control the on and off of the field effect transistor QP1. The third current limiting resistor RP2 and the fourth current limiting resistor RP1 are used to correctly divide the voltage to ensure that the field effect transistor QP1 can be normally turned off and on. The field effect transistor QP1 is connected in series to the main power supply line to control the switch of the power supply 31.

[0052] In this embodiment, the first control module 40 further includes an input / output module (GPIO module) 42, and the protection circuit unit 21 (the second base of the second transistor QP2) is connected to the first control module 40 through the input / output module 42. Thus, when the processing unit of the first control module 40 determines that the high-voltage interlock fault occurs according to the acquired detection current, the protection circuit unit 21 is controlled to start the Auto Retry function.

[0053] Optionally, the first control module 40 includes a processing unit, an ADC module 41 and a GPIO module 42, and the processing unit is connected to the ADC module 41 and the GPIO module 42 respectively; the processing unit obtains the detection current of the ADC module 41, and when a high-voltage interlock fault is determined according to the detection current, sends a control signal to the protection circuit unit 21 through the GPIO module 42 to start the Auto Retry function of the protection circuit unit 21.

[0054] Combination Figures 1 to 9 As shown, the disclosed embodiment also proposes a vehicle high-voltage interlock detection system, comprising a high-voltage interlock detection circuit 100 and a vehicle component to be detected according to any of the aforementioned embodiments, the vehicle component to be detected is arranged corresponding to the detection resistors (R1, R2, ..., Rn-1, Rn) of the high-voltage interlock circuit 100, and the plug-in portion of the component to be detected is connected to the high-voltage interlock detection circuit in parallel with the corresponding detection resistor.

[0055] The vehicle high-voltage interlock detection system of the disclosed embodiment includes the high-voltage interlock detection circuit 100 of any of the aforementioned embodiments, and all circuit modules are integrated into a detection circuit. It is not necessary to deploy devices on the components to be detected (for example, the high-voltage components of the vehicle) to assist in detection, nor is it necessary to assist in detection through CAN communication. In addition, except for the detection circuit, the disconnection of any component to be detected will not cause system failure, and the system has strong robustness. At the same time, it also has all the technical effects of the high-voltage interlock detection circuit 100.

[0056] In the vehicle high-voltage interlock detection system of the embodiment of the present disclosure, the vehicle components to be detected include but are not limited to a battery pack, an on-board charger, a DC / DC converter, a drive motor, and the like.

[0057] In some embodiments, the vehicle high-voltage interlock detection system further includes a second control module, which is used to determine that the vehicle has a high-voltage interlock fault and execute a safety strategy when the current detection current detected by the high-voltage interlock detection circuit is not within the safety current threshold range. In this embodiment, the function of the second control module can also be configured in the first control module 40, so that the first control module 40 has a fault judgment function. It is not limited, and it can exist in the form of two control modules or be integrated into one, which can be determined according to actual needs.

[0058] Optionally, the second control module is also used to execute safety strategies after determining that the vehicle has a high-voltage interlock fault. In this embodiment, the safety strategy includes, but is not limited to, one or more of the following: fault reporting, power cut-off, limiting vehicle power output, and high-voltage power-off. Specifically, the safety strategy includes: setting the fault register, and reporting the fault (such as: reporting to the upper-level system and informing the driver that a high-voltage interlock fault has occurred), and prompting the driver that the power will be shut off after a predetermined time (for example, x minutes), and prompting the driver to pull over; at the same time, controlling the vehicle system to execute further safety strategies, such as limiting the power output of the car, and powering off the high voltage after x minutes.

[0059] Optionally, the second control module (first control module 40) is further used to determine the current threshold interval of the current detection current when the current detection current is not in the safe current threshold interval; and determine the current high-voltage interlock fault type corresponding to the current detection current according to the corresponding relationship between the current threshold interval and the high-voltage interlock fault type. The corresponding relationship between the current threshold interval and the high-voltage interlock fault type is a preset relationship, as shown in Table 1.

[0060] Table 1

[0061] normal Short 12V power supply short ground Component 1 is open The second component is open ＊＊＊ The nth component is open Components 1 and 2 are open Components 1 and 3 are open ＊＊＊ Current threshold (Inor1, Inor2) (Ishort1, Ishort2) (Ishort3, Ishort4) (I1-1, I1-2) (I2-1, I2-2) ＊＊＊ (In-1, In-2) (I12-1, I12-2) (I13-1, I13-2) ＊＊＊

[0062] In Table 1, the endpoint value of each current threshold interval can be determined according to Vref of the adjustable voltage reference 21, the number and specific resistance values ​​of the detection resistors, the resistance value of the first resistor RS, and the resistance value of the protection resistor RP5.

[0063] In some embodiments, when the power supply module 30 of the high-voltage interlock detection circuit 100 includes a protection circuit unit 32 , the second control module is further configured to control the protection circuit unit 32 to operate when it is determined that a high-voltage interlock fault occurs in the vehicle.

[0064] Combination Fig.10 As shown, the embodiment of the present disclosure also proposes a vehicle high voltage interlock detection method, which is used as follows Figures 1 to 9 The vehicle high voltage interlock detection system shown includes the following steps:

[0065] S11, obtaining the current detection current of the high-voltage interlock circuit detection;

[0066] S12: When the current detection current is not within the safety current threshold range, it is determined that a high voltage interlock fault occurs in the vehicle.

[0067] The vehicle high-voltage interlock detection method of the disclosed embodiment is based on the high-voltage interlock circuit, which can directly collect the detection current, improve the anti-interference ability of the detection method, and is suitable for long-distance transmission scenarios; and it occupies less detection resources and does not need to occupy any resources of high-voltage components. At the same time, the vehicle high-voltage interlock detection method of the disclosed embodiment has the technical effect achieved by the high-voltage interlock circuit.

[0068] like Fig.11 As shown, in some embodiments, a vehicle high voltage interlock detection method includes the following steps:

[0069] S21, obtaining the current detection current of the high-voltage interlock circuit detection;

[0070] S22, when the current detection current is not in the safe current threshold interval, determining the current threshold interval in which the current detection current is located;

[0071] S23. Determine the current high-voltage interlock fault type corresponding to the current detection current according to the corresponding relationship between the current threshold interval and the high-voltage interlock fault type.

[0072] In the vehicle high-voltage interlock detection method of this embodiment, the correspondence between the current threshold interval and the high-voltage interlock fault type is preset, and can be stored as a correspondence table as shown in Table 1, so that the high-voltage interlock fault position can be quickly located to improve production efficiency. Specifically, when the resistance values ​​of the detection resistors in the detection module 20 are different, in addition to short ground, short power supply and open circuit, the fault type can also specifically locate the open circuit fault position, and the positioning efficiency is high.

[0073] In some embodiments, a vehicle high-voltage interlock detection method further includes, when the power supply module 30 of the high-voltage interlock detection circuit 100 includes a protection circuit unit 32, when the current detection current is not in the safety current threshold range, controlling the protection circuit unit 32 to operate. The working method refers to the above-mentioned related content.

[0074] In some embodiments, in a vehicle high-voltage interlock detection method, after determining that the vehicle has a high-voltage interlock fault, it also includes executing one or more of the following strategies: fault reporting, power cut-off, limiting vehicle power output, and high-voltage power-off. Specifically, the safety strategy includes: setting the fault register, reporting the fault (such as: reporting to the upper-level system and informing the driver of the high-voltage interlock fault), and prompting the driver to shut down the power after a predetermined time (for example, x minutes), and prompting the driver to pull over; at the same time, controlling the vehicle system to execute further safety strategies, such as limiting the power output of the car, and performing high-voltage power-off after x minutes.

[0075] like Fig.12 As shown, an embodiment of the present disclosure provides a vehicle high-voltage interlock detection device 500, including a processor (processor) 50 and a memory (memory) 51. Optionally, the device may also include a communication interface (CommunicationInterface) 52 and a bus 53. Among them, the processor 50, the communication interface 52, and the memory 51 can communicate with each other through the bus 53. The communication interface 52 can be used for information transmission. The processor 50 can call the logic instructions in the memory 51 to execute the detection method for the vehicle high-voltage interlock detection system of the above embodiment.

[0076] In addition, the logic instructions in the above-mentioned memory 51 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0077] The memory 51 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 50 executes the function application and data processing by running the program instructions / modules stored in the memory 51, that is, the detection method for the vehicle high-voltage interlock detection system in the above embodiment is implemented.

[0078] The memory 51 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 51 may include a high-speed random access memory and may also include a non-volatile memory.

[0079] The embodiments of the present disclosure also provide an electric vehicle, characterized in that it includes a high-voltage interlock detection circuit of any of the aforementioned embodiments; and / or a vehicle high-voltage interlock detection system of any of the aforementioned embodiments; and / or a detection method for a vehicle high-voltage interlock detection system of any of the aforementioned embodiments; and / or a vehicle high-voltage interlock detection device of any of the aforementioned embodiments.

[0080] The electric vehicle of the disclosed embodiment includes the high-voltage interlock detection circuit of any of the aforementioned embodiments, and has all the technical effects possessed by the high-voltage interlock detection circuit, which will not be elaborated here.

[0081] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0082] Those skilled 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, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0083] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. 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 units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0084] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

[0085] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A high voltage interlock detection circuit, characterized in that: include, The detection module comprises a first resistor, a plurality of detection resistors and a protection resistor which are sequentially connected in series to form a resistor series detection circuit; wherein the plurality of detection resistors correspond to a plurality of components to be detected and the detection resistors are used to be connected in parallel with the plug-in parts of the components to be detected corresponding to the detection resistors; A driving module, comprising an adjustable voltage reference and a first triode; an anode terminal of the adjustable voltage reference is respectively connected to a power supply and a base of the first triode, a cathode terminal is connected to a second terminal of a detection resistor side of a resistor series detection circuit, and a reference terminal is connected to a first terminal of a first resistor side of the resistor series detection circuit; an emitter of the first triode is connected to a first terminal of the resistor series detection circuit, a collector is connected to a power supply and a first current limiting resistor is arranged in series on the access circuit; A power supply module, used to provide power to the drive module; The current detection module is used to detect the detection current flowing through the first resistor.

2. The high voltage interlock detection circuit according to claim 1, characterized in that: In the detection module, multiple detection resistors have different resistance values.

3. The high voltage interlock detection circuit according to claim 1, characterized in that: The drive module further includes: The second current limiting resistor is connected in series to the connection line between the anode terminal of the adjustable voltage reference and the power supply.

4. The high voltage interlock detection circuit according to claim 1, characterized in that: The drive module further includes: The unidirectional current limiting element is connected in series to a connection circuit between the emitter of the first transistor and the first end of the series resistor detection circuit.

5. The high voltage interlock detection circuit according to claim 1, characterized in that: Also includes, The first control module includes a processing unit, and the processing unit is used to obtain the detection current of the current detection module.

6. The high voltage interlock detection circuit according to any one of claims 1 to 5, characterized in that: Power supply module, include: power supply; The protection circuit unit is connected to the output line of the positive side of the power supply, and the protection circuit has an automatic retry function; Wherein, in the case where the high-voltage interlock detection circuit includes a first control module, the first control module is also used to connect with the protection circuit unit to control the operation of the protection circuit according to the detection current.

7. The high voltage interlock detection circuit according to claim 6, characterized in that: Protection circuit unit, including, A microprocessing unit capable of acquiring a current flowing through the first resistor; A second triode, comprising a second base, a second collector and a second emitter, the second emitter is used for grounding, and the second base is used for connecting to the first control module; The field effect tube comprises a gate, a drain and a source, wherein the drain is used to be connected to the positive electrode of the power supply, the gate is connected to the second collector, and the source is connected to the driving module as a power output terminal to provide power to the driving module; A third current limiting resistor is connected in series to a connection line connecting the gate and the second collector; The fourth current limiting resistor has two ends connected to the gate and the drain of the field effect tube respectively.

8. A vehicle high voltage interlock detection system, characterized in that: include, The high voltage interlock detection circuit according to any one of claims 1 to 7; The vehicle component to be detected is arranged corresponding to the detection resistor of the high-voltage interlock circuit, and the plug-in portion of the component to be detected is connected to the high-voltage interlock detection circuit in parallel with the corresponding detection resistor.

9. The vehicle high voltage interlock detection system according to claim 8, characterized in that: Also includes, The second control module is used to determine that a high-voltage interlock fault occurs in the vehicle when a current detection current detected by the high-voltage interlock detection circuit is not within a safe current threshold range.

10. The vehicle high voltage interlock detection system according to claim 9, characterized in that: The second control module is also used to determine the current threshold interval of the current detection current when the current detection current is not in the safe current threshold interval; and determine the current high-voltage interlock fault type corresponding to the current detection current based on the correspondence between the current threshold interval and the high-voltage interlock fault type.

11. The vehicle high voltage interlock detection system according to claim 9, characterized in that: When the power supply module of the high-voltage interlock detection circuit includes a protection circuit unit, the second control module is further used to control the protection circuit unit to operate when it is determined that a high-voltage interlock fault occurs in the vehicle.

12. A detection method for a vehicle high voltage interlock detection system according to any one of claims 8 to 11, characterized in that: include, Get the current detection current of the high voltage interlock circuit detection; When the current detection current is not within the safety current threshold range, it is determined that a high voltage interlock fault occurs in the vehicle.

13. The detection method according to claim 12, characterized in that: Also includes, When the current detection current is not in the safe current threshold interval, determining the current threshold interval in which the current detection current is located; Determine the current high-voltage interlock fault type corresponding to the current detection current according to the corresponding relationship between the current threshold interval and the high-voltage interlock fault type; and / or, When the power supply module of the high-voltage interlock detection circuit includes a protection circuit unit, when the current detection current is not within the safety current threshold range, the protection circuit unit is controlled to operate.

14. A vehicle high-voltage interlock detection device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the detection method for a vehicle high-voltage interlock detection system according to claim 12 or 13 when running the program instructions.

15. An electric vehicle, characterized in that: include, The high voltage interlock detection circuit according to any one of claims 1 to 7; and / or, A vehicle high voltage interlock detection system as claimed in any one of claims 8 to 11; and / or, The detection method for a vehicle high voltage interlock detection system as claimed in claim 12 or 13; and / or, The vehicle high-voltage interlock detection device as claimed in claim 14.

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