CN116923099A

CN116923099A - Current-type high-voltage interlock detection system and method, and vehicle high-voltage interlock system

Info

Publication number: CN116923099A
Application number: CN202310948684.7A
Authority: CN
Inventors: 李强; 柯希春; 宋中奇
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2023-10-24

Abstract

The application belongs to the technical field of safety control of electric automobiles, and particularly relates to a current type high-voltage interlocking detection system and method as well as a vehicle high-voltage interlocking system, wherein the current type high-voltage interlocking detection system comprises: the device comprises a control module, a current type driving module and a detection module; the control module is used for controlling the starting or closing of the current type driving module; the current type driving module is used for outputting a stable current signal in a starting state; the detection module is respectively connected with the control module and the current type driving module and is also used for being connected on the high-voltage interlocking loop; the detection module comprises a switch unit, and the control module respectively performs fault detection on the detection module and the high-voltage interlocking loop through switching the working states of the switch unit. The current type high-voltage interlocking detection system can allow fault detection of the high-voltage interlocking loop to be carried out in a long distance, and has a complete fault diagnosis scheme, high accuracy and high reliability.

Description

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

Technical Field

The application belongs to the technical field of safety control of electric automobiles, and particularly relates to a current type high-voltage interlocking detection system and method and a vehicle high-voltage interlocking system.

Background

There are many high voltage connectors in electric vehicles, and if these high voltage connectors are loosened or disconnected in a state of high voltage, the electric vehicle may be electrified, so that an electric shock accident occurs, or a high voltage wire of the vehicle is locally overheated due to a large current, so that the vehicle burns. For new energy vehicles, the connection state of the high-voltage relay needs to be monitored in real time, and if the high-voltage relay is found to be disconnected, the emergency high voltage is needed, so that the occurrence of electric shock accidents is prevented.

Currently, various high voltage connectors are monitored, mainly by high voltage interlocks, such as: the high-voltage connector of battery pack, DCDC converter, OBC vehicle-mounted charger, motor etc. principle is: the battery management controller sends a signal, such as a PWM wave, through the wire that passes through all of the high voltage connectors that need to be tested and finally the wire returns to the controller.

If the external wiring is disconnected, the controller can not receive the signal output by the controller, and the external high-voltage line can be considered to be disconnected, the battery management controller can control the high-voltage relay in the battery pack to lower high voltage, and the external high-voltage output is disconnected, so that electric shock accidents are prevented.

However, the signal transmitted in the above scheme is easily disturbed, and as the distance between the wires increases, the signal may be attenuated, and problems of undetected signal or false detection may occur.

Disclosure of Invention

In view of the above-described drawbacks of the related art, an object of the present application is to provide a current-type high-voltage interlock detection system that outputs a stable current, improves the stability of a high-voltage interlock output signal, and prevents abnormality in detection of the high-voltage interlock signal due to an increase in external impedance without attenuation due to a change in external harness impedance.

To achieve the above and other related objects, the present application provides a current-type high-voltage interlock detection system comprising: the device comprises a control module, a current type driving module and a detection module; the control module is used for controlling the starting or closing of the current type driving module; the current type driving module is used for outputting a stable current signal in a starting state; the detection module is respectively connected with the control module and the current type driving module and is also used for being connected on a high-voltage interlocking loop; the detection module comprises a switch unit, and the control module respectively performs fault detection on the detection module and the high-voltage interlocking loop through switching the working states of the switch unit.

According to a specific embodiment of the present application, the detection module further includes: one end of the fixed load unit is connected with the output end of the current type driving module, and the other end of the fixed load unit is connected to the high-voltage interlocking loop; one end of the internal diagnosis unit is connected with the other end of the fixed load unit, and the other end of the internal diagnosis unit is connected with the control module; one end of the external detection unit is connected with the control module, and the other end of the external detection unit is connected to the high-voltage interlocking loop; the switch unit is respectively arranged on the internal diagnosis unit and the external detection unit, and comprises a first switch and a second switch; when the first switch is closed and the second switch is opened, fault detection is carried out on the detection module; and when the first switch is opened and the second switch is closed, fault detection is carried out on the high-voltage interlocking loop.

According to a specific embodiment of the present application, the control module determines whether a fault occurs on the detection module or the high voltage interlock loop by detecting the voltage on the internal diagnostic unit and the voltage on the external detection unit and the high voltage interlock loop, and analyzes the fault type.

According to a specific embodiment of the present application, the internal diagnostic unit includes; one end of the first resistor is connected with the other end of the fixed load unit, and the other end of the first resistor is connected with the control module; and one end of the second resistor is connected with the other end of the fixed load unit, and the other end of the second resistor is grounded.

According to a specific embodiment of the present application, the first switch is connected in series to one side of the second resistor.

According to a specific embodiment of the present application, the external detection unit includes: one end of the third resistor is connected with the control module, and the other end of the third resistor is connected to the high-voltage interlocking loop; and one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the other end of the third resistor.

According to a specific embodiment of the present application, the second switch is connected in series to one side of the fourth resistor.

According to one embodiment of the present application, the current-type driving module employs a current source chip,

according to a specific embodiment of the present application, the control module is further configured to terminate detection and alarm response when a fault occurs on the detection module or the high-voltage interlock loop according to a fault detection result; and when the detection module and the high-voltage interlocking loop are normal, repeatedly detecting faults of the high-voltage interlocking loop at preset intervals.

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

According to a specific embodiment of the present application, the control module is further configured to control the current-mode driving module to keep on when the detection result is normal according to the detection result; and when the detection result is a fault, controlling the current type driving module to be closed.

A method for detecting current type high-voltage interlocking comprises the following steps: enabling the current type driving module to start after the control module is electrified, and outputting a stable current signal; the control module respectively detects faults of the detection module and the high-voltage interlocking loop through the working state of the change-over switch unit.

According to a specific embodiment of the present application, the step of enabling the current driving module to start after the control module is powered on and outputting a stable current signal includes: the current type driving module performs self-checking before outputting a current signal, and feeds back a detection result to the control module; and the control module controls the current type driving module to keep on or off according to the detection result.

According to a specific embodiment of the present application, the step of the control module performing fault detection on the signal processing module and the high-voltage interlocking loop by switching the working states of the switch unit includes: under different working states of the switch unit, the control module respectively collects the voltages on the internal diagnosis unit, the external detection unit and the high-voltage interlocking loop; the control module compares the collected voltage with a preset threshold value, judges whether a fault occurs on the detection module or the high-voltage interlocking loop, and analyzes the fault type; if the detection module or the high-voltage interlocking loop fails, the control module terminates detection and alarm response; and if the detection module and the high-voltage interlocking loop are normal, the control module repeatedly detects faults of the high-voltage interlocking loop at preset intervals.

A vehicle high-voltage interlocking system comprises the current type high-voltage interlocking detection system, a battery pack, a DCDC converter, an OBC vehicle-mounted charger, a motor and the like; the battery pack, the DCDC converter, the OBC vehicle-mounted charger, the motor and other devices form a high-voltage interlocking loop, and the high-voltage interlocking loop is connected with the current-type high-voltage interlocking detection system.

The application provides a current type high-voltage interlocking detection system, which aims to solve the problems that detection signals of a traditional high-voltage interlocking system are easy to be interfered, attenuation occurs along with increase of line impedance, and detection accuracy is low or false detection is caused. Meanwhile, other line faults inside the system and outside the system are gradually checked, and the accuracy of open circuit fault detection of the high-voltage interlocking loop is greatly improved.

The current type high-voltage interlocking detection system can allow fault detection of the high-voltage interlocking loop to be carried out in a long distance, and has a complete fault diagnosis scheme, high accuracy and high reliability.

Drawings

FIG. 1 is a schematic diagram of a current-type high-voltage interlock detection system according to an embodiment of the present application;

FIG. 2 is a circuit topology diagram of an embodiment of a current-type high voltage interlock detection system according to the present application;

FIG. 3 is a schematic flow chart of an embodiment of a method for detecting current-type high-voltage interlock according to the present application;

FIG. 4 is a schematic diagram of a vehicle high voltage interlock system according to one embodiment of the present application;

FIG. 5 is a schematic diagram of a vehicle high pressure interlock system of one embodiment of the prior art;

fig. 6 is a circuit topology diagram of one embodiment of a prior art vehicle high voltage interlock system.

Detailed Description

Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

It should be noted that, in order to enable those skilled in the art to better understand the solution of the present application, the prior art is briefly described.

Referring to fig. 5 and 6, the battery management controller is connected in series with each high voltage connector to form a closed loop for closed loop control. When the battery management controller outputs a signal, the signal passes through each high-voltage connector to be detected and returns to the battery management controller, so that whether the high-voltage connector has an open circuit fault is judged. If the external line is disconnected, the battery management controller does not receive the output signal, and the external high-voltage line is considered to be disconnected. As shown in fig. 5, the high voltage connector may include: battery package, DCDC converter, OBC on-vehicle machine, motor. When the battery management controller identifies that an open circuit fault occurs on an external circuit, the high-voltage relay in the battery pack is controlled to output high voltage, and the external high-voltage output is disconnected, so that electric shock accidents are prevented. As shown in fig. 6, in a specific circuit topology structure of the battery management controller, a PWM signal is output by the MCU enabled driving chip, and flows to an external circuit of the high voltage connector along an internal circuit, and finally a voltage signal is formed and returned to the MCU, and the MCU determines whether an open circuit fault occurs in the external circuit of the high voltage connector according to the voltage signal analysis.

However, the PWM signal transmitted by the scheme is easy to be interfered, and the signal is attenuated correspondingly with the increase of the line distance, so that the problem that the signal is not detected or is erroneously detected may occur, thereby affecting the accuracy of high-voltage interlocking detection.

Therefore, the high-voltage interlocking detection system and method based on the current source chip can allow long-distance detection, have strong signal anti-interference capability and a complete fault diagnosis scheme, and greatly improve the accuracy of high-voltage interlocking detection.

Example 1

Referring to fig. 1-2, a current-type high voltage interlock detection system includes: a control module 10, a current-mode driving module 20, and a detection module 30. The control module 10 is configured to control the current-mode driving module 20 to be turned on or off, for example, by outputting an enable signal to drive the current-mode driving module 20. The current type driving module 20 is configured to output a stable current signal in a start-up state, has a strong anti-interference capability, and is not attenuated by an increase in a transmission line distance, i.e., an increase in impedance. The detection module 30 is connected with the control module 10 and the current-type driving module 20 respectively, and is also used for being connected on a high-voltage interlocking loop so as to detect faults. 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 operation state of the switch unit 31.

In this embodiment, the switch unit 31 is provided with a first working condition and a second working condition, and when the switch unit 31 is switched to the first working condition, the control module 10 performs fault detection on the detection module 30 by collecting the voltage on the detection module 30, so as to eliminate the internal fault of the system, and avoid affecting the accuracy of fault detection on the high-voltage interlocking loop. When the switch unit 31 is switched to the second working condition, the control module 10 performs fault detection on the detected load by collecting the voltage on the detection module 30, and identifies the fault type on the high-voltage interlocking loop, including, for example, 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 value, so as to determine whether the line has a fault.

In a specific embodiment, the detection module further includes: and a fixed load unit 32, one end of which is connected with the output end of the current type driving module 20, and the other end of which is connected with the high voltage interlocking loop. An internal diagnosis unit 33 having one end connected to the other end of the fixed load unit 32 and the other end 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. Wherein the switch unit 31 is provided on the internal diagnosis unit 33 and the external detection unit 34, respectively.

Specifically, as shown in fig. 2, the switching 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 driving module 20, and the other end of which is connected to the high-voltage interlock circuit. The internal diagnostic unit 33 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected with the resistor R5, and the other end of the first resistor R1 is connected with the control module 10; one end of the second resistor R2 is connected with the resistor R5, and the other end of the second resistor R2 is grounded through the first switch S1. The external detection unit 34 includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is connected with the control module 10, and the other end of the third resistor R3 is connected to the high-voltage interlocking loop; one end of the fourth resistor R4 is grounded through the second switch S2, and the other end of the fourth resistor R4 is connected with the other end of the third resistor R3.

As can be seen from the above, by closing or opening the first switch S1 and the second switch S2, i.e. switching the operation states of the switch unit 31, the line state of the detection module 30 can be adjusted, so as to implement fault detection on the detection module 30 or the high voltage interlock circuit. And the control module 10 can analyze and determine whether a fault has occurred by collecting the voltage on the internal diagnostic unit 33, and the voltage on the external detection unit 34 and the high voltage interlock loop, and analyze the fault type. In this embodiment, since the resistance of the fixed load unit 32 is a constant value, the control module 10 respectively collects the voltages on the resistors R5 and R1 as the first voltage signal, the voltages on the resistors R5 and R3 and the high-voltage interlock loop 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 exists or not, and analyzes the fault type.

Specifically, when the first switch S1 is closed and the second switch S2 is opened, the switch unit 31 is in the first working condition. At this time, since the resistors R1 and R2 are connected in parallel, the first voltage signal changes accordingly, and the control module 10 can compare the first voltage signal and the second voltage signal with the preset threshold, as shown in the following table one:

list one

Voltage (V)	First voltage signal	Second voltage signal
			Normal state	Threshold 1 to threshold 2	Threshold 1 to threshold 2
Failure of	0 to 1 threshold value, 2 to 5V threshold value	0 to 1 threshold value, 2 to 5V threshold value

And further determines whether the system internal circuit, i.e., the detection module 30, has a fault.

When the first switch S1 is turned off and the second switch S2 is turned on, the switch unit 32 is under the second working condition. At this time, since the resistors R3 and R4 are connected in parallel, the second voltage signal changes accordingly, and the control module 10 may compare the first voltage signal and the second voltage signal with the preset threshold, as shown in the following table two:

watch II

Voltage (V)	First voltage signal	Second voltage signal
			Normal state	Threshold 3 to threshold 4	Threshold 3 to threshold 4
Short circuit to ground	Threshold 7 to threshold 8	Threshold 7 to threshold 8
			Short circuit to power supply	Threshold 9 to threshold 6	Threshold 9 to threshold 6
Open circuit	Threshold 5 to threshold 6	Threshold 7 to threshold 8

And further judging whether an external circuit of the system, namely the high-voltage interlocking loop, has faults and the fault type.

It should be noted that, the on/off of the first switch S1 and the second switch S2 may be controlled by the control module 10, for example, a switching tube may be used.

Further, as shown in fig. 2, the control module 10 may employ an MCU chip. The current-type driving module 20 may employ a current source chip.

It should be noted that, the main characteristic of the current source chip may be used to compensate the current according to the impedance, in this embodiment, when the impedance of the wire harness becomes large due to the overlong line, if the PWM wave is used to perform high-voltage interlocking, the signal is easy to be attenuated, so that the problem of undetectable or false detection occurs; the current source chip is adopted, so that the current can be compensated when the resistance of the wire harness becomes large, and the current in the wire harness is ensured to be constant and is not influenced by the resistance.

Because the current flowing through the current type high-voltage interlocking detection system and the current flowing through the high-voltage interlocking loop are constant, the collected voltage signals on the detection module 30 are not influenced by external impedance, and therefore the accuracy of open circuit fault detection of the high-voltage interlocking loop is greatly improved.

In a specific embodiment, after the control module 10 enables the current-mode driving module 20 to start, the current-mode driving module 20 performs self-checking first, detects whether the internal circuit of the chip has a fault, and feeds back the detection result to the control module 10 to further check the fault inside the system, thereby improving the accuracy of detecting the fault of the high-voltage interlocking loop. If the detection result is normal, the control module 10 controls the current type driving module 20 to keep starting so as to perform subsequent fault detection; if the detection result is a fault, the control module 10 controls the current type driving module 20 to be closed, terminates fault detection on the high-voltage interlocking loop, gives an alarm and responds, and reminds a worker to maintain the system.

In this embodiment, to ensure accuracy of the high voltage interlock loop detection, it is preferable to enable the current mode driving module 20 to start when the control module 10 is powered up. First, the current driving module 20 performs self-inspection, performs first inspection, and performs subsequent inspection after the inspection result is normal. If the detection result is a fault, the fault detection of the high-voltage interlocking loop is stopped, and an alarm response is given to remind a worker of maintaining the system. Next, the control module 10 switches the switch unit 31 to the first working condition, checks the detection module 30, performs the second detection, compares the first voltage signal and the second voltage signal collected from the detection module 30 with the threshold value in the first table, determines whether the detection module 30 is faulty, and performs the subsequent detection after the detection result is normal. If the detection result is a fault, the fault detection of the high-voltage interlocking loop is stopped, and an alarm response is given to remind a worker of maintaining the system. Further, the control module 10 switches the switch unit 31 to the second working condition, checks the short circuit state of the high-voltage interlocking loop first, performs the third detection, compares the first voltage signal and the second voltage signal on the acquisition detection module 30 with the threshold value in the second table, determines whether the detection module 30 has a short circuit, and performs the subsequent detection after the detection result is normal. If the detection result is a short circuit to ground or a short circuit to a power supply, the open circuit detection of the high-voltage interlocking loop is stopped, and an alarm response is given to remind a worker to check the high-voltage interlocking loop so as to solve the short circuit problem. Finally, checking the open state of the high-voltage interlocking loop again, performing fourth detection, comparing the first voltage signal and the second voltage signal on the acquisition detection module 30 with the threshold value in the second table, judging whether the high-voltage interlocking loop is open, and repeating fault detection on the high-voltage interlocking loop at intervals of preset time after the detection result is normal so as to monitor the state of the high-voltage interlocking loop in real time. If the detection result is open, the alarm response is performed, the high-voltage relay in the battery pack is controlled to output high voltage, the external high-voltage output is disconnected, and the occurrence of electric shock accidents is prevented.

In conclusion, through gradually removing faults in the system and faults outside the system, the open-circuit fault detection of the high-voltage interlocking loop is enabled to have higher accuracy, and the reliability of the current type high-voltage interlocking detection system is greatly improved.

It should be noted that, the current-type high-voltage interlock detection system in this embodiment may be directly connected to the wire of the high-voltage interlock circuit, and in a specific embodiment, the current-type high-voltage interlock detection system may be manually connected to the high-voltage interlock circuit by a maintenance switch to form a closed circuit and perform fault detection, so that modifications and adaptations of the embodiments of the present application still fall into the scope of the claims of the present application.

Example 2

Referring to fig. 3, the present embodiment further provides a current-type high-voltage interlock detection method, which includes:

and S10, enabling the current type driving module to start after the control module is electrified, and outputting a stable current signal.

And step S20, the control module respectively detects faults of the detection module and the high-voltage interlocking loop through switching the working states of the switch units.

Specifically, the step of enabling the current type driving module to start after the control module is powered on and outputting a stable current signal comprises the following steps:

and S11, performing self-checking by the current type driving module before outputting a current signal, and feeding back a detection result to the control module.

And step S12, the control module controls the current type driving module to keep on or off according to the detection result.

The step that the control module carries out fault detection to the detection module and the high-voltage interlocking loop respectively through the working state of the change-over switch unit comprises the following steps:

and S21, respectively acquiring the voltage on the internal diagnosis unit and the voltage on the external detection unit and the high-voltage interlocking loop by the control module under different working states of the switch unit.

And S22, comparing the acquired voltage with a preset threshold value by the control module, judging whether the detection module or the high-voltage interlocking loop fails or not, and analyzing the failure type.

If the detection module or the high-voltage interlocking loop fails, the control module terminates detection and alarm response; if the detection module and the high-voltage interlocking loop are normal, the control module repeatedly detects faults of the high-voltage interlocking loop at preset intervals.

Example 3

Referring to fig. 4, the present embodiment further provides a vehicle high-voltage interlock system, including: the system comprises the current type high-voltage interlocking detection system 100, a battery pack 210, a DCDC converter 220, an OBC vehicle-mounted charger 230 and a motor 240. The battery pack 210, the DCDC converter 220, the OBC vehicle-mounted charger 230, the motor 240 and other devices are connected in series to form a high-voltage interlocking loop 200, and the galvanic high-voltage interlocking detection system connection 100 can be directly inserted into the high-voltage interlocking loop 200 and close the high-voltage interlocking loop 200 to perform fault detection and monitor line states. When the voltage abnormality on the high-voltage interlocking loop 200 is detected, the high-voltage relay in the battery pack is immediately controlled to lower the high voltage, the external high-voltage output is disconnected, and the occurrence of electric shock accidents is prevented.

In summary, the application provides a current type high-voltage interlocking detection system, which is used for solving the problems that detection signals of a traditional high-voltage interlocking system are easy to be interfered, attenuation occurs along with increase of line impedance, and detection accuracy is low or false detection is caused. Meanwhile, other line faults inside the system and outside the system are gradually checked, and the accuracy of open circuit fault detection of the high-voltage interlocking loop is greatly improved.

The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that an embodiment of the application can be practiced without one or more of the specific details, or with other apparatus, systems, components, methods, components, materials, parts, and so forth. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the application.

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

It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.

In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

As used in the description herein and throughout the claims that follow, unless otherwise indicated, "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims that follow, unless otherwise indicated, the meaning of "in …" includes "in …" and "on …".

The above description of illustrated embodiments of the application, including what is described in the abstract, is not intended to be exhaustive or to limit the application to the precise forms disclosed herein. Although specific embodiments of, and examples for, the application are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present application, as those skilled in the relevant art will recognize and appreciate. As noted, these modifications can be made to the present application in light of the foregoing description of illustrated embodiments of the present application and are to be included within the spirit and scope of the present application.

The systems and methods have been described herein in general terms as being helpful in understanding the details of the present application. Furthermore, various specific details have been set forth in order to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that an embodiment of the application can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the application.

Thus, although the application has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of the application will be employed without a corresponding use of other features without departing from the scope and spirit of the application as set forth. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present application. It is intended that the application not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this application, but that the application will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the application should be determined only by the following claims.

Claims

1. A amperometric high voltage interlock detection system comprising: the device comprises a control module, a current type driving module and a detection module;

the control module is used for controlling the starting or closing of the current type driving module;

the current type driving module is used for outputting a stable current signal in a starting state;

the detection module is respectively connected with the control module and the current type driving module and is also used for being connected on a high-voltage interlocking loop;

the detection module comprises a switch unit, and the control module respectively performs fault detection on the detection module and the high-voltage interlocking loop through switching the working states of the switch unit.

2. The amperometric, high-voltage interlock detection system of claim 1, wherein said detection module further comprises:

one end of the fixed load unit is connected with the output end of the current type driving module, and the other end of the fixed load unit is connected to the high-voltage interlocking loop;

one end of the internal diagnosis unit is connected with the other end of the fixed load unit, and the other end of the internal diagnosis unit is connected with the control module;

one end of the external detection unit is connected with the control module, and the other end of the external detection unit is connected to the high-voltage interlocking loop;

the switch unit is respectively arranged on the internal diagnosis unit and the external detection unit, and comprises a first switch and a second switch; when the first switch is closed and the second switch is opened, fault detection is carried out on the detection module; and when the first switch is opened and the second switch is closed, fault detection is carried out on the high-voltage interlocking loop.

3. The current mode high voltage interlock detection system according to claim 2, wherein the control module judges whether a fault occurs on the detection module or the high voltage interlock loop by detecting a voltage on the internal diagnostic unit and a voltage on the external detection unit and the high voltage interlock loop, and analyzes a fault type.

4. The amperometric high-voltage interlock detection system of claim 2, wherein said internal diagnostic unit comprises;

one end of the first resistor is connected with the other end of the fixed load unit, and the other end of the first resistor is connected with the control module;

and one end of the second resistor is connected with the other end of the fixed load unit, and the other end of the second resistor is grounded.

5. The amperometric, high-voltage interlock detection system of claim 4, wherein said first switch is connected in series on one side of said second resistor.

6. The amperometric high-voltage interlock detection system of claim 2, wherein said external detection unit comprises:

one end of the third resistor is connected with the control module, and the other end of the third resistor is connected to the high-voltage interlocking loop;

and one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the other end of the third resistor.

7. The amperometric, high-voltage interlock detection system of claim 6, wherein said second switch is connected in series on one side of said fourth resistor.

8. The amperometric, high-voltage interlock detection system of claim 1, wherein said amperometric drive module employs a current source chip.

9. The amperometric, high-voltage interlock detection system of claim 1, wherein said control module is further configured to,

when the detection module or the high-voltage interlocking loop fails, stopping detection and alarm response;

and when the detection module and the high-voltage interlocking loop are normal, repeatedly detecting faults of the high-voltage interlocking loop at preset intervals.

10. The amperometric, high-voltage interlock detection system of claim 1, wherein said amperometric drive module is further configured to perform a self-test prior to outputting the current signal and to feed back a detection result to said control module.

11. The amperometric, high-voltage interlock detection system of claim 10, wherein said control module is further configured to,

when the detection result is normal, controlling the current type driving module to keep starting;

and when the detection result is a fault, controlling the current type driving module to be closed.

12. The method for detecting the current type high-voltage interlocking is characterized by comprising the following steps of:

enabling the current type driving module to start after the control module is electrified, and outputting a stable current signal;

the control module respectively detects faults of the detection module and the high-voltage interlocking loop through the working state of the change-over switch unit.

13. The method of claim 12, wherein the step of enabling the current-mode driving module to start after the control module is powered on and outputting a stable current signal comprises:

the current type driving module performs self-checking before outputting a current signal, and feeds back a detection result to the control module;

and the control module controls the current type driving module to keep on or off according to the detection result.

14. The method for detecting the current-type high-voltage interlock according to claim 12, wherein the step of the control module performing fault detection on the signal processing module and the high-voltage interlock loop by switching the operating states of the switching unit respectively includes:

under different working states of the switch unit, the control module respectively collects the voltages on the internal diagnosis unit, the external detection unit and the high-voltage interlocking loop;

the control module compares the collected voltage with a preset threshold value, judges whether a fault occurs on the detection module or the high-voltage interlocking loop, and analyzes the fault type;

if the detection module or the high-voltage interlocking loop fails, the control module terminates detection and alarm response; and if the detection module and the high-voltage interlocking loop are normal, the control module repeatedly detects faults of the high-voltage interlocking loop at preset intervals.

15. A vehicle high-voltage interlocking system, characterized by comprising the current type high-voltage interlocking detection system according to any one of the above claims 1 to 11, a battery pack, a DCDC converter, an OBC vehicle-mounted charger and a motor;

the battery pack, the DCDC converter, the OBC vehicle-mounted charger and the motor form a high-voltage interlocking loop, and the high-voltage interlocking loop is connected with the current-type high-voltage interlocking detection system.