Current-type high-voltage interlock detection system and method, and vehicle high-voltage interlock system

Abstract

A current-type high-voltage interlock detection system and method, and a vehicle high-voltage interlock system, relating to the technical field of electric vehicle safety control. The current-type high-voltage interlock detection system comprises a control module (10), a current-type driving module (20), and a detection module (30); the control module (10) is used for controlling the on or off of the current-type driving module (20); the current-type driving module (20) is used for outputting a stable current signal in an on state; the detection module (30) is separately connected to the control module (10) and the current-type driving module (20), and is further connected to a high-voltage interlock loop; the detection module (30) comprises a switch unit (31); and the control module (10) separately performs fault detection on the detection module (30) and the high-voltage interlock loop by switching the working state of the switch unit (31). The current-type high-voltage interlock detection system can allow long-distance fault detection for the high-voltage interlock loop, and has a complete fault diagnosis scheme, high accuracy and higher reliability.

Description

Current-type high-voltage interlock detection system and method, and vehicle high-voltage interlock system Technical Field

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

[0002] Electric vehicles contain numerous high-voltage connectors. If these connectors become loose or disconnected while in the high-voltage state, the vehicle could become live, leading to electric shock. Alternatively, the high current could cause local overheating of the vehicle's high-voltage wires, potentially leading to vehicle combustion. This is extremely dangerous for new energy vehicles, so the connection status of the high-voltage relays must be monitored in real time. If a high-voltage relay is found to be disconnected, the high voltage must be immediately removed to prevent electric shock.

[0003] Currently, high-voltage interlocking is mainly used to monitor various high-voltage connectors, such as those of battery packs, DC-DC converters, OBC on-board chargers, and motors. The principle is: the battery management controller sends a signal, such as a PWM wave, through a wire. The wire passes through all the high-voltage connectors that need to be tested and finally returns to the controller.

[0004] If the external wiring is disconnected, the controller will not receive the signal output by the controller and will think that the external high-voltage line is disconnected. The battery management controller will control the high-voltage relay in the battery pack to reduce the high voltage and disconnect the external high-voltage output to prevent electric shock accidents.

[0005] However, the signal transmitted in the above solution is easily interfered with, and as the distance of the wire increases, the signal will attenuate, and the problem of no signal detection or false detection may occur.

[0006] Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a current-type high-voltage interlock detection system that outputs a stable current, improves the stability of the high-voltage interlock output signal, and does not attenuate due to changes in the external wiring harness impedance, thereby preventing abnormal high-voltage interlock signal detection due to increased external impedance.

[0008] To achieve the above-mentioned purpose and other related purposes, the present invention provides a current-type high-voltage interlock detection system, comprising: a control module, a current-type drive module, and a detection module; the control module is used to control the start or shutdown of the current-type drive module; the current-type drive module is used to output a stable current signal in the start-up state; the detection module is respectively connected to the control module and the current-type drive module, and is also used to be connected to a high-voltage interlock circuit; wherein the detection module includes a switch unit, and the control module performs fault detection on the detection module and the high-voltage interlock circuit respectively by switching the working state of the switch unit.

[0009] According to a specific embodiment of the present invention, the detection module also includes: a fixed load unit, one end of which is connected to the output end of the current-type drive module, and the other end is connected to the high-voltage interlocking loop; an internal diagnostic unit, one end of which is connected to the other end of the fixed load unit, and the other end is connected to the control module; an external detection unit, one end of which is connected to the control module, and the other end is connected to the high-voltage interlocking loop; wherein the switch unit is respectively arranged on the internal diagnostic unit and the external detection unit, and the switch unit includes a first switch and a second switch; when the first switch is closed and the second switch is disconnected, the detection module is subjected to fault detection; when the first switch is disconnected and the second switch is closed, the high-voltage interlocking loop is subjected to fault detection.

[0010] According to a specific embodiment of the present invention, the control module determines whether a fault occurs in the detection module or the high-voltage interlock circuit and analyzes the type of fault by detecting the voltage on the internal diagnostic unit, as well as the voltage on the external detection unit and the high-voltage interlock circuit.

[0011] According to a specific embodiment of the present invention, the internal diagnostic unit includes: a first resistor, one end of which is connected to the other end of the fixed load unit, and the other end is connected to the control module; a second resistor, one end of which is connected to the other end of the fixed load unit, and the other end is grounded.

[0012] According to a specific embodiment of the present invention, the first switch is connected in series on one side of the second resistor.

[0013] According to a specific embodiment of the present invention, the external detection unit includes: a third resistor, one end of which is connected to the control module and the other end is connected to the high-voltage interlocking circuit; a fourth resistor, one end of which is grounded and the other end is connected to the other end of the third resistor.

[0014] According to a specific embodiment of the present invention, the second switch is connected in series on one side of the fourth resistor.

[0015] According to a specific embodiment of the present invention, the current-type driving module adopts a current source chip.

[0016] According to a specific embodiment of the present invention, the control module is also used to terminate the detection and respond to an alarm based on the fault detection result when a fault occurs in the detection module or the high-voltage interlocking circuit; when the detection module and the high-voltage interlocking circuit are both normal, repeat the fault detection of the high-voltage interlocking circuit at intervals of preset time.

[0017] According to a specific embodiment of the present invention, the current-type driving module is further configured to perform a self-test before outputting a current signal, and feed back the test result to the control module.

[0018] According to a specific embodiment of the present invention, the control module is further configured to control the current-mode driving module to remain enabled when the detection result is normal, and to control the current-mode driving module to be disabled when the detection result is a fault.

[0019] A current-type high-voltage interlock detection method comprises: after a control module is powered on, a current-type drive module is enabled to start and output a stable current signal; and the control module performs fault detection on a detection module and a high-voltage interlock circuit respectively by switching the working state of a switch unit.

[0020] According to a specific embodiment of the present invention, after the control module is powered on, the step of enabling the current-type driver module to start and output a stable current signal includes: the current-type driver module performs a self-test before outputting the current signal and feeds back the test result to the control module; the control module controls the current-type driver module to remain started or shut down according to the test result.

[0021] According to a specific embodiment of the present invention, the steps of the control module performing fault detection on the signal processing module and the high-voltage interlocking circuit respectively by switching the working state of the switch unit include: in different working states of the switch unit, the control module respectively collects the voltage on the internal diagnostic unit, and the voltage on the external detection unit and the high-voltage interlocking circuit; the control module compares the collected voltage with a preset threshold value, determines whether a fault occurs on the detection module or the high-voltage interlocking circuit, and analyzes the type of fault; wherein, if a fault occurs on the detection module or the high-voltage interlocking circuit, the control module terminates the detection and responds to the alarm; if both the detection module and the high-voltage interlocking circuit are normal, the control module repeats the fault detection on the high-voltage interlocking circuit at a preset time interval.

[0022] A vehicle high-voltage interlock system includes the above-mentioned current-type high-voltage interlock detection system, as well as a battery pack, a DCDC converter, an OBC on-board charger, a motor, etc.; wherein the battery pack, the DCDC converter, the OBC on-board charger, the motor and other components form a high-voltage interlock circuit and are connected to the current-type high-voltage interlock detection system.

[0023] To address the problems of traditional high-voltage interlock systems, where detection signals are susceptible to interference and attenuate as line impedance increases, resulting in low detection accuracy or false detection, this present invention provides a current-type high-voltage interlock detection system. This system, based on a current source chip, can stably output current signals and collect voltages inside and outside the system to determine the circuit status of the high-voltage interlock circuit. Simultaneously, it gradually troubleshoots other circuit faults both inside and outside the system, significantly improving the accuracy of ultimately detecting open-circuit faults in the high-voltage interlock circuit.

[0024] The current-type high-voltage interlock detection system of the present invention can allow long-distance fault detection of a high-voltage interlock circuit, and has a complete fault diagnosis solution, high accuracy, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic structural diagram of a specific embodiment of a current-type high-voltage interlock detection system provided by the present invention;

[0026] FIG2 is a circuit topology diagram of a specific embodiment of a current-type high-voltage interlock detection system provided by the present invention;

[0027] FIG3 is a flow chart of a specific embodiment of a current-type high-voltage interlock detection method provided by the present invention;

[0028] FIG4 is a schematic structural diagram of a specific embodiment of a vehicle high-voltage interlocking system provided by the present invention;

[0029] FIG5 is a schematic structural diagram of a specific embodiment of a vehicle high-voltage interlocking system in the prior art;

[0030] FIG6 is a circuit topology diagram of a specific embodiment of a vehicle high-voltage interlocking system in the prior art. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0032] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not 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 complex.

[0033] First of all, it should be noted that in order to enable people in this technical field to better understand the present application solution, a brief description of the existing technology is given.

[0034] As shown in Figures 5 and 6, the battery management controller is connected in series with each high-voltage connector, forming a closed circuit for closed-loop control. The battery management controller outputs a signal, which passes through each high-voltage connector to be tested and returns to the battery management controller, thereby determining whether the high-voltage connector has an open-circuit fault. If the external circuit is disconnected and the battery management controller does not receive the output signal, it assumes that the external high-voltage circuit is disconnected. As shown in Figure 5, the high-voltage connector may include: a battery pack, a DC-DC converter, an on-board charger (OBC), and a motor. When the battery management controller detects an open-circuit fault in the external circuit, it controls the high-voltage relay within the battery pack to reduce the high voltage, disconnecting the external high-voltage output to prevent electric shock. Figure 6 shows the specific circuit topology of the battery management controller. The MCU enables the driver chip, which outputs a PWM signal. This signal flows along the internal circuit to the external circuit of the high-voltage connector, ultimately forming a voltage signal that returns to the MCU. The MCU then analyzes the voltage signal to determine whether the external circuit of the high-voltage connector has an open-circuit fault.

[0035] However, the PWM signal transmitted by this solution is easily interfered with, and as the line distance increases, the signal will attenuate accordingly, which may cause problems such as failure to detect the signal or false detection, thereby affecting the accuracy of high-voltage interlock detection.

[0036] Therefore, this application designs a high-voltage interlock detection system and method based on the current source chip, which can allow long-distance detection, has strong signal anti-interference ability, and a complete fault diagnosis solution, which greatly improves the accuracy of high-voltage interlock detection.

[0037] Example 1

[0038] Please refer to Figures 1-2, which show a current-type high-voltage interlock detection system, including: a control module 10, a current-type drive module 20, and a detection module 30. The control module 10 is used to control the start or shut down of the current-type drive module 20, for example, by outputting an enable signal to drive the current-type drive module 20. The current-type drive module 20 is used to output a stable current signal in the startup state, has a strong anti-interference ability, and will not attenuate due to the increase in the distance of the transmission line, that is, the increase in impedance. The detection module 30 is connected to the control module 10 and the current-type drive module 20, respectively, and is also used to be connected to the high-voltage interlock circuit to perform fault detection on it. Specifically, the detection module 30 includes a switch unit 31, and the control module 10 performs fault detection on the detection module 30 or the high-voltage interlock circuit by switching the working state of the switch unit 31.

[0039] In this embodiment, the switch unit 31 is provided with operating conditions 1 and 2. When the switch unit 31 is switched to operating condition 1, the control module 10 performs fault detection on the detection module 30 by collecting the voltage on the detection module 30 to eliminate internal system faults and avoid affecting the accuracy of high-voltage interlock circuit fault detection. When the switch unit 31 is switched to operating condition 2, the control module 10 performs fault detection on the detection load by collecting the voltage on the detection module 30 to identify the type of fault in the high-voltage interlock circuit, such as a short circuit to ground, a short circuit to power supply, or an open circuit. Specifically, the control module 10 compares the collected voltage with a preset threshold to determine whether the circuit is faulty.

[0040] In one specific embodiment, the detection module further includes: a fixed load unit 32, one end of which is connected to the output end of the current-mode driver module 20 and the other end of which is connected to the high-voltage interlock circuit. An internal diagnostic unit 33, one end of which is connected to the other end of the fixed load unit 32 and the other end of which is connected to the control module 10. An external detection unit 34, one end of which is connected to the control module 10 and the other end of which is connected to the high-voltage interlock circuit. The switch unit 31 is respectively provided on the internal diagnostic unit 33 and the external detection unit 34.

[0041] Specifically, as shown in Figure 2, the switch unit 31 includes a first switch S1 and a second switch S2, and the fixed load unit 32 is a resistor R5, one end of which is connected to the output end of the current-type drive module 20, and the other end is connected to the high-voltage interlocking circuit. The internal diagnostic unit 33 includes a first resistor R1 and a second resistor R2. Among them, one end of the first resistor R1 is connected to the resistor R5, and the other end is connected to the control module 10; one end of the second resistor R2 is connected to the resistor R5, and the other end is grounded through the first switch S1. The external detection unit 34 includes a third resistor R3 and a fourth resistor R4. Among them, one end of the third resistor R3 is connected to the control module 10, and the other end is connected to the high-voltage interlocking circuit; one end of the fourth resistor R4 is grounded through the second switch S2, and the other end is connected to the other end of the third resistor R3.

[0042] As can be seen from the above, by closing or opening the first switch S1 and the second switch S2, that is, switching the working state of the switch unit 31, the circuit state of the detection module 30 can be adjusted, thereby realizing fault detection of the detection module 30 or the high-voltage interlock circuit. The control module 10 can analyze and determine whether a fault has occurred and analyze the type of fault by collecting the voltage on the internal diagnostic unit 33, as well as the voltage on the external detection unit 34 and the high-voltage interlock circuit. In this embodiment, since the resistance of the fixed load unit 32 is a constant value, the control module 10 collects the voltage on the resistors R5 and R1 as the first voltage signal, and the voltage on the resistors R5, R3, and the high-voltage interlock circuit as the second voltage signal, and compares the first voltage signal and the second voltage signal with the preset threshold value to determine whether a fault has occurred and analyze the type of fault.

[0043] Specifically, when the first switch S1 is closed and the second switch S2 is open, the switch unit 31 is in working condition 1. At this time, since the resistors R1 and R2 are connected in parallel, the first voltage signal changes accordingly. The control module 10 can compare the first voltage signal and the second voltage signal with a preset threshold value, as shown in Table 1 below:

[0044] Table 1

[0045] Then, it is determined whether the internal circuit of the system, that is, the detection module 30, has a fault.

[0046] When the first switch S1 is open and the second switch S2 is closed, the switch unit 32 is in working condition 2. At this time, since the resistors R3 and R4 are connected in parallel, the second voltage signal changes accordingly. The control module 10 can compare the first voltage signal and the second voltage signal with the preset threshold value, as shown in Table 2 below:

[0047] Table 2

[0048] Then determine whether the system's external circuit, that is, the high-voltage interlock circuit, has a fault, and the type of fault.

[0049] It should be noted that the on and off of the first switch S1 and the second switch S2 can be controlled by the control module 10, for example, a switch tube can be used.

[0050] Furthermore, as shown in FIG2 , the control module 10 may be implemented as an MCU chip, and the current-mode driving module 20 may be implemented as a current source chip.

[0051] It should be noted that the main characteristics of the current source chip can be used to compensate for current according to the impedance size. In this embodiment, when the line is too long and the harness impedance becomes larger, if PWM waves are used for high-voltage interlocking, it is easy to cause signal attenuation, resulting in problems of undetectable or false detection. However, the use of a current source chip can compensate for the current when the harness impedance becomes larger, so as to ensure that the current in the line is constant and not affected by the impedance.

[0052] Since the current flowing through the current-type high-voltage interlock detection system and the high-voltage interlock loop is constant, the voltage signal collected on the detection module 30 will not be affected by external impedance, thereby greatly improving the accuracy of open circuit fault detection of the high-voltage interlock loop.

[0053] In one embodiment, after the control module 10 enables the current-mode driver module 20 to start, the current-mode driver module 20 first performs a self-test to detect whether there is a fault in the chip's internal circuitry. The test results are then fed back to the control module 10 to further troubleshoot internal system faults and improve the accuracy of high-voltage interlock circuit fault detection. If the test result is normal, the control module 10 controls the current-mode driver module 20 to remain enabled for subsequent fault detection. If the test result indicates a fault, the control module 10 controls the current-mode driver module 20 to shut down, terminate the high-voltage interlock circuit fault detection, and generate an alarm response to alert personnel to perform system maintenance.

[0054] In this embodiment, in order to ensure the accuracy of the detection of the high-voltage interlocking circuit, preferably, when the control module 10 is powered on, the current-type driving module 20 is enabled to start. First, the current-type driving module 20 self-checks, performs the first detection, and performs subsequent detections after the detection result is normal. If the detection result is a fault, the fault detection of the high-voltage interlocking circuit is terminated, and an alarm response is issued to remind the staff to maintain the system. Secondly, the control module 10 switches the switch unit 31 to working condition one, verifies the detection module 30, and performs a second detection. By collecting the first voltage signal and the second voltage signal on the detection module 30 and comparing them with the threshold value in the above Table 1, it is determined whether the detection module 30 is faulty, and subsequent detection is performed after the detection result is normal. If the detection result is a fault, the fault detection of the high-voltage interlocking circuit is terminated, and an alarm response is issued to remind the staff to maintain the system. Furthermore, the control module 10 switches the switch unit 31 to operating condition 2, first checking the short-circuit status of the high-voltage interlock circuit and performing a third test. By collecting the first and second voltage signals on the detection module 30 and comparing them with the threshold values ​​in Table 2, it is determined whether the detection module 30 is short-circuited. If the test result is normal, subsequent tests are performed. If the test result is a short circuit to ground or a short circuit to power, the open circuit test of the high-voltage interlock circuit is terminated, and an alarm response is issued, reminding the staff to inspect the high-voltage interlock circuit and address the short circuit issue. Finally, the open circuit status of the high-voltage interlock circuit is checked again and a fourth test is performed. By collecting the first and second voltage signals on the detection module 30 and comparing them with the threshold values ​​in Table 2, it is determined whether the high-voltage interlock circuit is open. If the test result is normal, the high-voltage interlock circuit fault detection is repeated at preset intervals to monitor the status of the high-voltage interlock circuit in real time. If the test result is an open circuit, an alarm response is issued, and the high-voltage relay in the battery pack is controlled to reduce the high voltage, disconnecting the external high-voltage output to prevent electric shock accidents.

[0055] In summary, by gradually eliminating faults inside and outside the system, the open circuit fault detection of the high-voltage interlock circuit is made more accurate, which greatly improves the reliability of the current-type high-voltage interlock detection system.

[0056] It should be noted that the current-type high-voltage interlock detection system in this embodiment can be directly connected to the wire of the high-voltage interlock circuit. In a specific embodiment, it can be connected to the high-voltage interlock circuit through a manual maintenance switch to form a closed loop and perform fault detection. Without departing from the spirit of the present invention, modifications and improvements made to the embodiments of the present invention by those skilled in the art still fall within the scope of the invention patent application of the present invention.

[0057] Example 2

[0058] Referring to FIG3 , this embodiment further provides a current-type high-voltage interlock detection method, including:

[0059] Step S10 : After the control module is powered on, the current-type driving module is enabled to start and output a stable current signal.

[0060] In step S20, the control module performs fault detection on the detection module and the high-voltage interlocking circuit respectively by switching the working state of the switch unit.

[0061] Specifically, after the control module is powered on, the steps of enabling the current-type driving module to start and output a stable current signal include:

[0062] In step S11 , the current-type driving module performs a self-test before outputting a current signal, and feeds back the test result to the control module.

[0063] Step S12: the control module controls the current-mode driving module to remain enabled or disabled according to the detection result.

[0064] The steps of the control module performing fault detection on the detection module and the high-voltage interlock circuit respectively by switching the working state of the switch unit include:

[0065] In step S21 , the control module collects the voltage on the internal diagnosis unit, and the voltage on the external detection unit and the high-voltage interlock circuit respectively under different working states of the switch unit.

[0066] In step S22, the control module compares the collected voltage with a preset threshold value, determines whether a fault occurs in the detection module or the high-voltage interlock circuit, and analyzes the type of fault.

[0067] Among them, if the detection module or the high-voltage interlock circuit fails, the control module terminates the detection and responds to the alarm; if the detection module and the high-voltage interlock circuit are both normal, the control module repeats the fault detection of the high-voltage interlock circuit at a preset time interval.

[0068] Example 3

[0069] As shown in FIG4 , this embodiment also provides a vehicle high-voltage interlock system, comprising: the above-mentioned current-type high-voltage interlock detection system 100, as well as a battery pack 210, a DC-DC converter 220, an OBC onboard charger 230, and a motor 240. The battery pack 210, the DC-DC converter 220, the OBC onboard charger 230, the motor 240, and other components are connected in series to form a high-voltage interlock circuit 200, and the current-type high-voltage interlock detection system connection 100 can be directly plugged into the high-voltage interlock circuit 200 and close the high-voltage interlock circuit 200 to detect faults and monitor the circuit status. When an abnormal voltage on the high-voltage interlock circuit 200 is detected, the high-voltage relay in the battery pack is immediately controlled to reduce the high voltage, disconnecting the external high-voltage output to prevent electric shock accidents.

[0070] In summary, the present invention addresses the problem that the detection signal of a conventional high-voltage interlocking system is susceptible to interference and attenuates as line impedance increases, resulting in low detection accuracy or false detection. This system provides a current-type high-voltage interlocking detection system. This system utilizes a current source chip that can stably output current signals and collect voltages inside and outside the system to determine the line status of the high-voltage interlocking circuit. Simultaneously, it gradually troubleshoots other line faults inside and outside the system, greatly improving the accuracy of the final open-circuit fault detection of the high-voltage interlocking circuit.

[0071] The current-type high-voltage interlock detection system of the present invention can allow long-distance fault detection of a high-voltage interlock circuit, and has a complete fault diagnosis solution, high accuracy, and high reliability.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

[0073] In the description herein, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, assemblies, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0074] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

[0075] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0076] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

[0077] As used in the description herein and throughout the claims that follow, “a,” “an,” and “the” include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless otherwise indicated.

[0078] The above description of the illustrated embodiments of the present invention (including that described in the Abstract) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, as those skilled in the art will recognize and appreciate, various equivalent modifications are possible within the spirit and scope of the present invention. As noted, modifications may be made to the present invention in light of the above description of the illustrated embodiments of the present invention, and such modifications will be within the spirit and scope of the present invention.

[0079] Systems and methods have been generally described herein in detail to facilitate understanding of the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of these specific details, or with other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0080] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are contemplated within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the claimed invention. Thus, many modifications may be made to adapt a particular environment or material to the true scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the claims below and / or to the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention is intended to include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A current type high voltage interlock detection system, characterized in that: include: A control module, a current-type driving module, and a detection module; The control module is used to control the start or stop of the current-type driving module; The current-type driving module is used to output a stable current signal in a startup state; The detection module is connected to the control module and the current-type driving module respectively, and is also used to be connected to a high-voltage interlocking loop; Wherein, the detection module includes a switch unit, and the control module performs fault detection on the detection module and the high-voltage interlocking circuit respectively by switching the working state of the switch unit.

2. The current type high voltage interlock detection system according to claim 1, characterized in that: The detection module also includes: A fixed load unit, one end of which is connected to the output end of the current-type driving module, and the other end of which is connected to the high-voltage interlocking loop; an internal diagnostic unit, one end of which is connected to the other end of the fixed load unit and the other end of which is connected to the control module; An external detection unit, one end of which is connected to the control module, and the other end of which is connected to the high-voltage interlocking circuit; Wherein, the switch unit is respectively arranged on the internal diagnostic unit and the external detection unit, and the switch unit includes a first switch and a second switch; when the first switch is closed and the second switch is opened, the detection module is subjected to fault detection; when the first switch is opened and the second switch is closed, the high-voltage interlocking circuit is subjected to fault detection.

3. The current type high voltage interlock detection system according to claim 2, characterized in that: The control module determines whether a fault occurs in the detection module or the high-voltage interlock circuit and analyzes the type of fault by detecting the voltage on the internal diagnosis unit and the voltage on the external detection unit and the high-voltage interlock circuit.

4. The current type high voltage interlock detection system according to claim 2, characterized in that: The internal diagnostic unit comprises: A first resistor, one end of which is connected to the other end of the fixed load unit, and the other end of which is connected to the control module; The second resistor has one end connected to the other end of the fixed load unit and the other end grounded.

5. The current type high voltage interlock detection system according to claim 4, characterized in that: The first switch is connected in series on one side of the second resistor.

6. The current type high voltage interlock detection system according to claim 2, characterized in that: The external detection unit comprises: A third resistor, one end of which is connected to the control module, and the other end of which is connected to the high-voltage interlocking circuit; The fourth resistor has one end connected to the ground and the other end connected to the other end of the third resistor.

7. The current-type high-voltage interlock detection system according to claim 6, characterized in that: The second switch is connected in series to one side of the fourth resistor.

8. The current type high voltage interlock detection system according to claim 1, characterized in that: The current-type driving module adopts a current source chip.

9. The current-type high-voltage interlock detection system according to claim 1, characterized in that: The control module is also used to, according to the fault detection result, When a fault occurs in the detection module or the high-voltage interlocking circuit, the detection is terminated and an alarm response is issued; When the detection module and the high-voltage interlock circuit are both normal, the fault detection of the high-voltage interlock circuit is repeatedly performed at preset intervals.

10. The current-type high-voltage interlock detection system according to claim 1, characterized in that: The current-type driving module is also used to perform self-test before outputting the current signal, and feed back the test result to the control module.

11. The current-type high-voltage interlock detection system according to claim 10, characterized in that: The control module is also used to, according to the detection result, When the detection result is normal, controlling the current-type driving module to remain started; When the detection result is a fault, the current-type driving module is controlled to be turned off.

12. A current-type high-voltage interlock detection method, characterized in that: include: After the control module is powered on, the current-type drive module is enabled to start and output a stable current signal; The control module performs fault detection on the detection module and the high-voltage interlocking circuit respectively by switching the working state of the switch unit.

13. The current-type high-voltage interlock detection method according to claim 12, characterized in that: The steps of enabling the current-type driving module to start after the control module is powered on and outputting a stable current signal include: The current-type driving module performs a self-check before outputting a current signal, and feeds back the check result to the control module; The control module controls the current-type driving module to remain enabled or disabled according to the detection result.

14. The current-type high-voltage interlock detection method according to claim 12, characterized in that: The steps of the control module performing fault detection on the signal processing module and the high-voltage interlocking circuit respectively by switching the working state of the switch unit include: Under different working states of the switch unit, the control module respectively collects the voltage on the internal diagnosis unit, and the voltage on the external detection unit and the high-voltage interlocking circuit; The control module compares the collected voltage with a preset threshold value, determines whether a fault occurs in the detection module or the high-voltage interlocking circuit, and analyzes the type of fault; Among them, if a fault occurs in the detection module or the high-voltage interlocking circuit, the control module terminates the detection and responds to the alarm; if the detection module and the high-voltage interlocking circuit are both normal, the control module repeats the fault detection of the high-voltage interlocking circuit at a preset time interval.

15. A vehicle high voltage interlocking system, characterized in that: A current-type high-voltage interlock detection system comprising any one of claims 1 to 11, as well as a battery pack, a DCDC converter, an OBC on-board charger, and a motor; Among them, the battery pack, the DCDC converter, the OBC on-board charger, and the motor form a high-voltage interlocking circuit, which is connected to the current-type high-voltage interlocking detection system.

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