High voltage interlock circuit, vehicle high voltage interlock detection system and method, and electric vehicle

Abstract

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

Description

TECHNICAL FIELD

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

[0002] Safety technology has always been one of the core technologies of new energy vehicles, which is also one of the main concerns of new energy vehicle consumers. It is obvious that the reliability of the high-voltage circuit is one of the most concerned points in the safety monitoring system of new energy vehicles. The most important monitoring system of the high-voltage circuit is the high-voltage interlock system, and the main function of this system is to detect the on-off state between each high-voltage component (i.e. the monitored component) and detect whether any abnormal condition occurs (such as short low-voltage power supply, short ground). When an abnormal condition occurs, the vehicle controller will perform power-down processing according to the strategy to make the vehicle in a safe state.

[0003] The existing high-voltage interlock circuit can be divided into two categories: voltage type high-voltage interlock and current type high-voltage interlock. The common voltage type high-voltage interlock circuit compares the voltage signals at the input and output ends to determine whether the high-voltage component has an abnormality, and the signal source of this type of circuit has a constant voltage source and a PWM type signal generator. Since the high-voltage interlock line of new energy vehicles is usually long, and the voltage signal is more susceptible to interference than the current signal, the high voltage in the high-voltage interlock may affect the voltage type high-voltage interlock circuit, affecting the accuracy of the detection. At the same time, the current type high-voltage interlock circuit is good at long distance fault detection and has strong anti-interference ability, with high reliability, but the traditional constant current type high-voltage interlock circuit has weak fault type diagnosis ability. SUMMARY

[0004] One of the purposes of the present application 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 balance the transmission distance and the fault type diagnosis, and a constant voltage type current type high-voltage interlock detection circuit is designed based on an adjustable voltage reference, which is suitable for long distance detection, has strong signal anti-interference ability, and can identify multiple fault types, thereby improving the efficiency and accuracy of the vehicle high-voltage interlock detection system.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

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

[0007] In some embodiments, a vehicle high-voltage interlock detection system includes the high-voltage interlock detection circuit described above; and a component to be detected of the vehicle is arranged corresponding to the detection resistor of the high-voltage interlock circuit, and the plug-in part of the component to be detected is connected to the high-voltage interlock detection circuit in a parallel manner 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 the high-voltage interlock circuit; and determining that a high-voltage interlock fault occurs in the vehicle when the current detection current is not in a safe current threshold interval.

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

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

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

[0012] In the embodiments of the present disclosure, the high-voltage interlock detection circuit is designed based on an adjustable voltage reference, and a current type driving module with a constant voltage type is realized, so as to output a stable current signal for the detection module. The current flowing through the first resistor RS is detected for fault diagnosis, which has strong anti-interference ability and is suitable for long-distance transmission scenarios. Moreover, the detection resource is less occupied, and any resource of the high-voltage component is not occupied. Moreover, the detection current values are different in the high-voltage interlock safe connection state and the fault state, so that the state of the high-voltage interlock circuit and the fault type (for example, open circuit, short ground, and short power supply) can be diagnosed, and the production efficiency is improved. At the same time, all the circuit modules are integrated into one detection circuit, and no device needs to be deployed on the to-be-detected component (for example, the high-voltage component of the vehicle) to help detection, and no auxiliary detection through CAN communication is needed. Moreover, the disconnection of any to-be-detected component will not cause system failure except the detection circuit, so that the high-voltage interlock detection system has strong robustness. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A structural block diagram of a high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 1.

[0014] Figure 2 A schematic diagram of a high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 2.

[0015] Figure 3 A high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 3.

[0016] Figure 4 Another high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 4.

[0017] Figure 5 Another high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 5.

[0018] Figure 6 Another high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 6.

[0019] Figure 7 A schematic diagram of another high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 7.

[0020] Figure 8 A schematic diagram of another high-voltage interlock detection circuit provided by the embodiments of the present disclosure is shown in FIG. 8.

[0021] Figure 9 A structural schematic diagram of another high-voltage interlock detection system provided by the embodiments of the present disclosure is shown in FIG. 9.

[0022] Figure 10 A flowchart of a vehicle high-voltage interlock detection method provided by the embodiments of the present disclosure is shown in FIG. 10.

[0023] Figure 11 A flow chart of another vehicle high-pressure interlock detection method provided by an embodiment of the present disclosure is shown in FIG. 7.

[0024] Figure 12 A schematic diagram of a vehicle high-pressure interlock detection device provided by an embodiment of the present disclosure is shown in FIG. 8.

[0025] Reference signs:

[0026] 100, high-pressure interlock detection circuit; 10, detection module; 20, driving 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] Other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied by other different specific embodiments, and various modifications or changes can be made to the details in the present specification based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0028] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, but not the number, shape and size of the components when actually implemented. The actual implementation of each component can be randomly changed in shape, number and proportion, and the layout pattern of the components can also be more complex.

[0029] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-described diagrams are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] Unless otherwise specified, the term "a plurality of" means two or more.

[0031] The term "corresponding" can refer to an association or binding relationship. A and B correspond to each other means that there is an association or binding relationship between A and B.

[0032] In combination Figures 1 to 8As shown, the high-voltage interlock detection circuit 100 according to the embodiment of the present disclosure includes 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, thereby forming a resistor series detection circuit. The plurality of detection resistors (R1, R2, …, Rn-1, Rn) correspond to a plurality of components to be detected, and the detection resistors are 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 triode Q1. The anode of the adjustable voltage reference 21 is connected with a power supply and the base of the first triode Q1, respectively. The cathode of the adjustable voltage reference 21 is connected with the second end of the detection resistor side of the resistor series detection circuit. The reference end of the adjustable voltage reference 21 is connected with the first end of the first resistor RS side of the resistor series detection circuit. The emitter of the first triode Q1 is connected with the first end of the resistor series detection circuit. The collector of the first triode Q1 is connected with the power supply and a first current-limiting resistor RP4 arranged in series on the connection line. The power supply module 30 is configured to provide power supply for the driving module 20. The current detection module 41 is configured to detect the current flowing through the first resistor RS.

[0033] In the high-voltage interlock detection circuit according to the embodiment of the present disclosure, the adjustable voltage reference collects the voltage Vin between the two ends of the resistor series detection circuit formed by the first resistor RS, the plurality of detection resistors (R1, R2, …, Rn), and the protection resistor RP5, and compares the voltage Vin with the reference voltage Vref in the adjustable voltage reference. The error between the voltage Vin and the reference voltage Vref is amplified by an amplifier to adjust the conduction degree of the first triode Q1, thereby reducing the error between the voltage Vin and the reference voltage Vref, and further stabilizing the voltage Vin to the reference voltage Vref. The adjustable voltage reference is designed based on the adjustable voltage reference, thereby realizing the current-type driving module with the constant voltage type, and outputting stable current signals for the detection module. The fault diagnosis is performed by detecting the current flowing through the first resistor RS, thereby having strong anti-interference ability and being suitable for long-distance transmission scenarios. Moreover, the detection module occupies less detection resources and does not need to occupy any resources of the high-voltage components. The detection module adjusts the current signal. When a fault occurs, the detection module is reconfigured. Under the premise that the voltage between the two ends of the resistor series detection circuit is stable at the reference voltage Vref, the size of the current of the high-voltage interlock loop is adjusted, so that the detection current values are different in the high-voltage interlock safe connection state and the fault state, thereby being able to diagnose the state and the fault type (for example, open circuit, short ground, and short power supply) of the high-voltage interlock circuit, and improving the production efficiency.

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

[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 is shown in the normal connection state. At this time, the current I nor =V ref / (RS+RP5). This current is the normal current (safety 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 component to be detected in the high-voltage interlock circuit is open, 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 resistances 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 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 a high-voltage interlock fault is detected, the system can then determine the fault type, such as an open circuit fault, a power short fault, and a ground short fault, based on the specific values ​​of the detection current. Detecting these various fault types only requires detecting a single current signal, which saves resources and eliminates the need to deploy components on the component being tested.

[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 interlock circuit, the open circuit current I OCIn the calculation formula of 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, 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, 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). Similarly, the corresponding open-circuit currents when different components to be detected are open 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 plurality of detection resistors ( R1 , R2 , . . . , Rn) are not limited and can be set according to actual conditions as long as the open circuit currents under different fault types can be distinguished.

[0043] In the disclosed embodiment, the driver module 20 serves as the core module of the high-voltage interlock circuit, responsible for converting the constant voltage power supply output into a constant current signal output, and bears the robustness index of the high-voltage interlock detection circuit and the system. In the driver 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 emitter of the first transistor Q1, and to stabilize the voltage across RS, R1, R2, ..., Rn and RP5 by utilizing the linear amplification region 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 currents 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 and preventing large current from damaging the adjustable voltage reference 21 source.

[0045] In some embodiments, the driver module further includes a unidirectional current-limiting element D1 connected in series with the connection line between the emitter of the first transistor Q1 and the first end of the series resistor detection circuit. The function of the unidirectional current-limiting element D1 is to prevent 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 provided in series on the connection line, and the positive electrode of the power supply is also connected to the anode end of the adjustable voltage reference 21 .

[0050] In some embodiments, combined 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 of 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, the power is turned on 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 transistor QP2, a field effect transistor QP1, a third current limiting resistor RP2 and a fourth current limiting resistor RP1. The second transistor QP2 includes a second base, a second collector and a second emitter, the second emitter is grounded, and the second base is connected to the first control module 40. The field effect transistor QP1 includes a gate, a drain and a source, the drain is connected to the positive pole 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 end to provide power supply for the driving module 20. The third current limiting resistor RP2 is connected in series in the connection line between the gate and the second collector. The fourth current limiting resistor RP1 has two ends connected to the gate and the drain of the field effect transistor QP1. In this embodiment, the second transistor QP2, the field effect transistor QP1, the third current limiting resistor RP2 and the fourth current limiting resistor RP1 constitute an Auto Retry circuit controlled by the first control unit 40 (for example, a microprocessor). The second transistor QP2 controls the conduction and turn-off of the field effect transistor QP1. The third current limiting resistor RP2 and the fourth current limiting resistor RP1 correctly divide the voltage to ensure that the field effect transistor QP1 can be normally turned off and turned on. The field effect transistor QP1 is connected in series on 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, the processing unit of the first control module 40 determines the high-voltage interlock fault according to the detected current, and controls the protection circuit unit 21 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; the processing unit acquires the detected current of the ADC module 41, and 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 when the high-voltage interlock fault is determined according to the detected current.

[0054] In combination Figures 1 to 9 As shown in the drawings, the present disclosure further provides a vehicle high-voltage interlock detection system, which includes the high-voltage interlock detection circuit 100 of any of the foregoing embodiments and a vehicle component to be detected, the vehicle component to be detected is arranged in correspondence with the detection resistor (R1, R2, …, Rn-1, Rn) of the high-voltage interlock circuit 100, and the plug-in part 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 embodiments of the present disclosure includes the high-voltage interlock detection circuit 100 of any of the foregoing embodiments, all the circuit modules are integrated into one detection circuit, without the need to deploy devices on the components to be detected (for example, high-voltage components of the vehicle) to assist in detection, nor the need to assist in detection through CAN communication. In addition, the disconnection of any component to be detected will not cause the system to fail, and the system has strong robustness. At the same time, the vehicle high-voltage interlock detection system 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 embodiments of the present disclosure, the components to be detected of the vehicle include but are not limited to battery packs, on-board chargers, DC / DC converters, drive motors, etc.

[0057] In some embodiments, the vehicle high-voltage interlock detection system further includes a second control module configured 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 in the safe current threshold interval. 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 the function of judging faults. Without limitation, it can exist in the form of two control modules, or it can be integrated into one, which can be determined according to actual needs.

[0058] Optionally, the second control module is further configured to execute a safety strategy 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 cutoff, limiting vehicle power output, and high-voltage power down. Specifically, the safety strategy includes setting a fault register and reporting a fault (for example, reporting to the previous level system and informing the driver that there is a high-voltage interlock fault), and prompting the driver to turn off the power after a predetermined time (for example, x minutes) and to stop the vehicle; at the same time, the vehicle system is controlled to execute further safety strategies, such as limiting the power output of the vehicle and performing high-voltage power down after x minutes.

[0059] Optionally, the second control module (the first control module 40) is further configured to determine the current current threshold interval in which the current detection current is located 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 correspondence between the current threshold interval and the high-voltage interlock fault type. The correspondence 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 supply Short ground 1st component open circuit 2nd component open circuit ＊＊＊ n* component open circuit 1st and 2nd component open circuit 1st and 3rd component open circuit ＊＊＊ 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 values of each current threshold interval can be determined according to Vref of the adjustable voltage reference 21, the number and specific resistance of the detection resistors, the resistance of the first resistor RS, and the resistance of the protection resistor RP5, etc.

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

[0064] In combination Figure 10 As shown in the embodiments of the present disclosure, a vehicle high-voltage interlock detection method is also provided, which is used for the vehicle high-voltage interlock detection system as Figures 1 to 9 As shown in the vehicle high-voltage interlock detection system, the method comprises the following steps:

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

[0066] S12, determining that the vehicle has a high-voltage interlock fault when the current detection current is not in a safe current threshold interval.

[0067] The vehicle high-voltage interlock detection method of the embodiments of the present disclosure is based on a high-voltage interlock circuit, realizes direct acquisition of a detection current, improves the anti-interference ability of the detection method, is suitable for a long-distance transmission scene, and occupies less detection resources without occupying any resources of a high-voltage component. At the same time, the vehicle high-voltage interlock detection method of the embodiments of the present disclosure has the technical effects realized by the high-voltage interlock circuit.

[0068] As shown in the embodiments of the present disclosure, a vehicle high-voltage interlock detection method comprises the following steps: Figure 11

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

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

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

[0072] In the vehicle high-voltage interlock detection method of the embodiments, the corresponding relationship between the current threshold interval and the high-voltage interlock fault type is pre-set, which can be stored as a corresponding relationship table as shown in Table 1, so that the high-voltage interlock fault position can be quickly located, and the production efficiency is improved. Specifically, when the resistances of the detection resistors in the detection module 20 are different, the fault type can be specifically located to the open circuit fault position in addition to the short ground, short power supply, and open circuit, and the positioning efficiency is high. ​

[0073] In some embodiments, the vehicle high-voltage interlock detection method further comprises, when the power supply module 30 of the high-voltage interlock detection circuit 100 comprises the protection circuit unit 32, controlling the protection circuit unit 32 to work in the case that the current detection current is not in the safe current threshold interval. For the working mode, refer to the foregoing related content.

[0074] In some embodiments, the vehicle high-voltage interlock detection method further comprises, after determining that the vehicle has a high-voltage interlock fault, performing one or more of the following strategies: fault reporting, power cut-off, limiting vehicle power output, and high-voltage power-down. Specifically, the safety strategy comprises setting a fault register and reporting a fault (such as reporting to the upper-level system and informing the driver that there is a high-voltage interlock fault), and prompting the driver to turn off the power after a predetermined time (for example, x minutes), and prompting the driver to park on the roadside; at the same time, controlling the vehicle system to perform further safety strategies, such as limiting the power output of the vehicle, and performing high-voltage power-down after x minutes.

[0075] As shown in Figure 12 The vehicle high-voltage interlock detection device 500 provided by the embodiments of the present disclosure includes a processor 50 and a memory 51. Optionally, the device can also include a communication interface 52 and a bus 53. 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 invoke the logical instructions in the memory 51 to execute the detection method for the vehicle high-voltage interlock detection system of the above-mentioned embodiments.

[0076] In addition, when the logical instructions in the memory 51 are implemented in the form of a software function unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0077] The memory 51, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments 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, implements the detection method for the vehicle high-voltage interlock detection system in the above-mentioned embodiments.

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

[0079] The electric vehicle of the embodiments of the present disclosure comprises the high-voltage interlock detection circuit of any of the foregoing embodiments, and has all the technical effects of the high-voltage interlock detection circuit, which will not be repeated here.

[0080] The electric vehicle of the embodiments of the present disclosure comprises the high-voltage interlock detection circuit of any of the foregoing embodiments, and has all the technical effects of the high-voltage interlock detection circuit, which will not be repeated here.

[0081] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural, logical, electrical, process, and other changes. The embodiments are merely representative of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Portions and features of some embodiments can be included in, or substituted for, those of other embodiments. Also, words used in this document are used for description and not for limitation. As used in the description of the embodiments and the claims that follow, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and / or" as used in this document refers to any one or more of the associated listed items, explaining that a combination of any of the associated items can be used, with others not used. Also, the term "comprise" and variations of the term, such as "comprises" and / or "comprising," as used in this document, are intended to mean that the statement encompasses the presence of the recited features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Unless otherwise defined, an element that is defined by a statement "comprising... " does not exclude the presence of additional same elements in the process, method, article, or apparatus that includes the stated element. In this document, each of the embodiments can focus on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the method, product, etc. disclosed by the embodiments, if it corresponds to the method part disclosed by the embodiments, the relevant part can be referred to the description of the method part.

[0082] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to realize the described functions, but such implementation should not be considered beyond the scope of the embodiments of the present disclosure. The skilled person can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0083] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units can only be a logical function division, and actual implementation can have another division manner, for example, a plurality of 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 the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms. The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to implement the embodiments. In addition, each functional unit in the embodiments of the present disclosure can be integrated in one processing unit, or each unit can be a physically independent unit, or two or more units can be integrated in one unit.

[0084] The computer program product of the present disclosure can be a computer program embodied on a non-transitory computer readable medium. When the program runs on a computer, the program causes the computer to execute functions of the embodiments of the present disclosure. The computer program can be stored and / or distributed on media, such as CD-ROM, DVD, USB, flash memory, RAM, ROM, etc. The media is readable from a general purpose or special purpose computer, or a network interface. The media can be distributed on-line or offline, and the program can be stored and / or distributed on the media in the form of, for example, compressed packages, magnetic discs, optical discs, hard disk, floppy discs, RAM, ROM, etc.

[0085] The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Any equivalent replacement or transformation made by those skilled in the art based on the present application shall fall within the protection scope of the present application.

Claims

1. A high voltage interlock detection circuit, characterized in that: include, The detection module includes a first resistor, a plurality of detection resistors, and a protection resistor arranged 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 portions of the corresponding components to be detected; A drive module includes an adjustable voltage reference and a first transistor; the anode terminal of the adjustable voltage reference is respectively connected to a power supply and a base of the first transistor, the cathode terminal is connected to a second terminal on a detection resistor side of a series resistor detection circuit, and the reference terminal is connected to a first terminal on a first resistor side of the series resistor detection circuit; the emitter of the first transistor is connected to the first terminal of the series resistor detection circuit, the collector is connected to the power supply, and a first current-limiting resistor is provided in series with the access circuit; A power supply module is 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 driver module also 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 driver module also includes, The unidirectional current limiting element is connected in series to the 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 further 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 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; The field effect transistor includes a gate, a drain and a source, wherein the drain is 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 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 set corresponding to the detection resistor of the high-voltage interlock circuit, and the plug-in part 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 configured 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 configured 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 safe 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, If the current detection current is not within the safe current threshold range, determining the current threshold range within 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 range 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, The vehicle high-voltage interlock detection system according to any one of claims 8 to 11; and / or, The detection method for a vehicle high-voltage interlock detection system according to claim 12 or 13; and / or, The vehicle high-voltage interlock detection device as claimed in claim 14.

Images