Interlock detection system, high voltage system and high voltage interlock detection and fault location method

Abstract

The interlock detection system provided by the present invention includes: an interlock detection module, a plurality of high-voltage components, a battery pack, a high-voltage wiring harness and a low-voltage interlock wiring harness; the battery pack includes a battery pack low-voltage plug-in and a plurality of battery pack high-voltage plug-ins, the plurality of high-voltage components each include a first high-voltage plug-in and a first low-voltage plug-in, the high-voltage wiring harness includes a first high-voltage wiring harness and a second high-voltage wiring harness, and the low-voltage interlock wiring harness includes a first low-voltage interlock wiring harness and a second low-voltage interlock wiring harness; wherein the interlock detection module is integrated in the battery pack, the first end of the interlock detection module is connected to the first input end and the second input end of the plurality of high-voltage components through the first low-voltage interlock wiring harness and the second low-voltage interlock wiring harness, and the first output end and the second output end of the plurality of high-voltage components are respectively connected to the positive pole and the negative pole of the battery pack high-voltage plug-in to form a plurality of interlocking loops.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to an interlock detection system, a high voltage system and a high voltage interlock detection and fault positioning method. Background Art

[0002] In order to ensure that the connectors of high-voltage components in the high-voltage circuit of electric vehicles are not energized when they are unplugged or loose, thereby ensuring the personal safety of maintenance personnel, the interlocking connection method of high-voltage connectors must be considered when designing the high-voltage circuit of electric vehicles. The vehicle's electronic control system detects the interlocking connection line and learns that the connector is unplugged, and then ensures that the high-voltage interface of the vehicle is not energized.

[0003] At present, the high-voltage interlocking design on electric vehicles all uses low-voltage signals to determine the connection status of the high-voltage system. That is, after the low-voltage interlocking signal is sent from the detection module, it passes through the low-voltage wiring harness to the low-voltage plug-in of the high-voltage component, and then from the low-voltage plug-in to the high-voltage plug-in inside the high-voltage component and then back to the low-voltage plug-in, and then to the low-voltage plug-in of another high-voltage component and directly back to the detection module. It can be seen that the solution of the prior art cannot clearly identify the fault point in the interlocking circuit after an interlocking failure occurs, and it is necessary to check it section by section and finally locate the fault point. It is time-consuming, labor-intensive and error-prone, and the low-voltage wiring harness in the prior art has multiple transfers, which increases the failure rate of high-voltage components. Summary of the invention

[0004] The present invention provides an interlock detection system, a high voltage system and a high voltage interlock detection fault positioning method, so as to solve the problems of high failure rate of high voltage components and difficulty in locating fault points.

[0005] According to a first aspect of the present invention, an interlock detection system is provided, comprising: an interlock detection module, a plurality of high-voltage components, a battery pack, a high-voltage wiring harness, and a low-voltage interlock wiring harness; the battery pack comprises a battery pack low-voltage plug-in and a plurality of battery pack high-voltage plug-ins, the plurality of high-voltage components each comprises a first high-voltage plug-in and a first low-voltage plug-in, the high-voltage wiring harness comprises a first high-voltage wiring harness and a second high-voltage wiring harness, and the low-voltage interlock wiring harness comprises a first low-voltage interlock wiring harness and a second low-voltage interlock wiring harness;

[0006] Among them, the interlock detection module is integrated in the battery pack, and the first end of the interlock detection module is connected to the first input end and the second input end of the several high-voltage components through the first low-voltage interlock wiring harness and the second low-voltage interlock wiring harness, and the first output end and the second output end of the several high-voltage components are respectively connected to the positive pole and the negative pole of the high-voltage plug-in of the battery pack to form a number of interlocking loops.

[0007] Optionally, a vehicle controller is also included, and the vehicle controller is connected to the several high-voltage components and the battery pack via CAN communication.

[0008] Optionally, it also includes a diagnostic port, which is connected to the vehicle controller and the battery pack via the CAN communication.

[0009] According to a second aspect of the present invention, a high voltage system is provided, comprising the interlock detection system involved in the first aspect and optional solutions thereof.

[0010] According to a third aspect of the present invention, there is provided a new energy vehicle, comprising the new energy vehicle involved in the second aspect and its optional solutions.

[0011] According to a fourth aspect of the present invention, a high-voltage interlock fault detection and positioning method is provided, which is applied to the interlock detection system involved in the first aspect and its optional solutions, comprising:

[0012] S1: Acquire interlocking signals of the plurality of interlocking circuits and bus voltages of the plurality of high-voltage components;

[0013] S2: Based on the interlocking signals of the plurality of interlocking circuits, determining a faulty interlocking circuit;

[0014] S3: Determine the fault point based on the bus voltage of the faulty high-voltage component in the fault interlocking circuit.

[0015] Optionally, step S3 includes:

[0016] S31: Determine whether the bus voltage of all the faulty high-voltage components is above a preset threshold value, if so, proceed to S33, if not, proceed to S34;

[0017] S32: Determine whether the bus voltage of at least one of the faulty high-voltage components is less than a preset threshold value, if so, proceed to S35, if not, proceed to S33;

[0018] S33: Determine that the low voltage interlock connection of the fault circuit is abnormal;

[0019] S34: Determine that the battery pack high voltage plug-in on the fault circuit is faulty;

[0020] S35: Determine that the first high-voltage plug-in of the at least one faulty high-voltage component is faulty;

[0021] The preset threshold is represented by half of the battery pack voltage value.

[0022] Optionally, before step S33, the following steps are further included:

[0023] S330: Obtain the voltage of the battery pack. The interlock detection system, high-voltage system and high-voltage interlock detection and fault location method provided by the present invention integrate the low-voltage interlock loop into the high-voltage wiring harness, which does not need to pass through the first low-voltage plug-in of the high-voltage component, and thus the low-voltage interlock wiring harness does not need to pass through multiple transfers, thereby reducing the failure rate of the low-voltage interlock loop; in addition, by judging the value of the bus voltage on the high-voltage component, the fault point can be quickly located. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 The structure of the interlock detection system of the prior art in one embodiment of the present invention is schematically shown. Figure 1 ;

[0026] Figure 2 The structure of the interlock detection system in one embodiment of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 3 The structure of the interlock detection system in one embodiment of the present invention is shown in FIG. Figure 2 ;

[0028] Figure 4 The process of the high voltage interlock fault detection and positioning method described in an example of the present invention is Figure 1 ;

[0029] Figure 5 The process of the high voltage interlock fault detection and positioning method described in an example of the present invention is Figure 2 .

[0030] Description of reference numerals:

[0031] 1-Interlock detection module;

[0032] 2- High voltage components;

[0033] 201-first high voltage plug-in;

[0034] 202-first low-voltage plug-in;

[0035] 3-Battery pack;

[0036] 301-Battery pack high voltage plug-in;

[0037] 302-Battery pack low voltage plug-in;

[0038] 401-first low voltage interlock harness;

[0039] 402-second low voltage interlock harness;

[0040] 501- first high voltage wiring harness;

[0041] 502- second high voltage wiring harness;

[0042] 6-CAN communication;

[0043] 7-Vehicle controller; 8-Diagnostic port. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0047] Please refer to Figure 1 Before filing this application, the applicant conducted a thorough study on the interlock detection system and proposed a Figure 1 The interlock detection system shown is for Figure 1 The interlock detection system shown has the following problems:

[0048] Figure 1The interlock detection system determines the connection status of the high-voltage system through a low-voltage signal. Specifically, after the low-voltage interlock signal is sent from the interlock detection module, it first passes through the low-voltage wiring harness (401, 402) to the low-voltage plug-in 202 of the high-voltage component 2, and then passes from the low-voltage plug-in 202 to the high-voltage plug-in 201 inside the high-voltage component 2 and then back to the low-voltage plug-in 202, and then to the low-voltage plug-in 202 of another high-voltage component 2 until it returns to the detection module.

[0049] Specifically, Figure 1 The maintenance steps for the interlock detection module in the scheme to detect that the HVIL1 interlock circuit is open are: disconnect the low-voltage plug-in of the interlock detection module and disconnect the low-voltage plug-in of the high-voltage component. Measure whether the pin pin of the output of the low-voltage wiring harness HVIL1 interlock circuit to the pin pin of the high-voltage component 2 input is conductive; if conductive, measure whether the pin pin of the high-voltage component 2 input and the pin pin of the high-voltage component 2 output are conductive; if conductive, measure whether the pin pin of the high-voltage component 2 output and the pin pin of the high-voltage component 2 input are conductive; if conductive, measure downward in sequence until the non-conductive section is found. However, due to the actual installation position of the high-voltage component and other reasons, the entire troubleshooting work will result in a large amount of man-hour cost.

[0050] In the above scheme, after an interlocking fault occurs, the fault point in the interlocking circuit cannot be clearly identified, and it is necessary to check section by section to finally locate the fault point, which reduces efficiency and is prone to errors.

[0051] In addition, the low-voltage interlocking circuit of the above scheme requires multiple transfers through low-voltage plug-ins of high-voltage components and low-voltage plug-ins of battery packs. The wiring harness of the low-voltage interlocking circuit is prone to connection abnormalities during multiple transfers, thereby increasing the failure rate of the low-voltage interlocking circuit.

[0052] In view of this, the present invention proposes a new interlock detection system, which integrates a low-voltage interlock circuit into a high-voltage wiring harness, and can achieve the above-mentioned effect without multiple switching, and reduces the failure rate.

[0053] Regarding the solution of the present invention, the specific description is as follows:

[0054] Please refer to Figure 2 The interlock detection system of the present invention comprises: an interlock detection module 1, a plurality of high-voltage components 2, a battery pack 3, a high-voltage wiring harness and a low-voltage interlock wiring harness; the battery pack 3 comprises a battery pack low-voltage plug-in 302 and a plurality of battery pack high-voltage plug-ins 301, the plurality of high-voltage components 2 each comprises a first high-voltage plug-in 201 and a first low-voltage plug-in 202, the high-voltage wiring harness comprises a first high-voltage wiring harness 501 and a second high-voltage wiring harness 502, and the low-voltage interlock wiring harness comprises a first low-voltage interlock wiring harness 401 and a second low-voltage interlock wiring harness 402;

[0055] Among them, the interlock detection module 1 is integrated in the battery pack 3, and the first end of the interlock detection module 1 is connected to the first input end and the second input end of the multiple high-voltage components 2 through the first low-voltage interlock harness 401 and the second low-voltage interlock harness 402, and the first output end and the second output end of the multiple high-voltage components 2 are respectively connected to the positive pole and the negative pole of the battery pack high-voltage plug-in 301 to form a plurality of interlocking loops.

[0056] The interlock detection module 1 is used to send and receive low voltage interlock detection signals and to diagnose the signals.

[0057] In one embodiment, the interlock detection module 1 is integrated into a high-voltage component, for example, integrated into the battery pack 3 .

[0058] Of course, the present invention is not limited thereto, and the interlock detection module 1 may be integrated into other high-voltage components within the protection scope of the present invention.

[0059] Regarding the high-voltage component 2, in one embodiment, the high-voltage component 2 is characterized as a high-voltage component in the high-voltage system of an electric vehicle, and its electrical interface generally includes a high-voltage plug-in and a low-voltage plug-in.

[0060] Regarding the battery pack 3, in one embodiment, the battery pack 3 is characterized as a power battery for providing high-voltage power for high-voltage components.

[0061] In the above scheme, the present invention integrates the low-voltage interlocking circuit into the high-voltage wiring harness without passing through the battery pack low-voltage plug-in and the first low-voltage plug-in, thereby reducing the switching of the low-voltage interlocking wiring harness and greatly reducing the failure rate.

[0062] In a preferred embodiment, please refer to Figure 3 The interlock detection system also includes a vehicle controller 7, which is connected to the several high-voltage components 2 and the battery pack 3 via CAN communication.

[0063] For other preferred embodiments, please refer to Figure 3 The interlock detection system also includes a diagnostic port 8, which is connected to the vehicle controller 7 and the battery pack 3 through the CAN communication.

[0064] It can be seen that the interlock detection system can transmit fault information to the vehicle controller 7, and the vehicle controller 7 determines the fault point. Finally, the information of the fault point can be obtained by the diagnosis port 8, avoiding manual troubleshooting and improving detection efficiency.

[0065] The present invention also provides a high voltage system, comprising the above-mentioned interlock detection system.

[0066] The present invention also provides a new energy vehicle, comprising the high voltage system described above.

[0067] Please refer to Figure 4 The present invention also provides a high-voltage interlock detection and fault location method, which is applied to the above-mentioned interlock detection system, comprising:

[0068] S1: Acquire interlocking signals of the plurality of interlocking circuits and bus voltages of the plurality of high-voltage components;

[0069] S2: Based on the interlocking signals of the plurality of interlocking circuits, determining a faulty interlocking circuit;

[0070] S3: Determine the fault point based on the bus voltage of the faulty high-voltage component in the fault interlocking circuit.

[0071] In a specific embodiment, the interlock detection module 1 detects the interlock status of each interlock circuit and sends the status of each interlock circuit to the vehicle controller 7 through the CAN network; when the interlock detection module 1 detects an interlock fault, it can identify which interlock has a problem, but cannot determine which high-voltage connector or low-voltage connector in the interlock has a problem. At this time, the plurality of high-voltage components 2 send the bus voltage to the vehicle controller 7 through the CAN network, and the vehicle controller 7 determines the specific fault point in the high-voltage component.

[0072] In one example, when designing the interlocking of the entire vehicle, the high-voltage system of the entire vehicle will be designed as multiple interlocking circuits, and each interlocking circuit will connect multiple high-voltage components in series.

[0073] Regarding the determination of bus voltage, in a preferred embodiment, please refer to Figure 5 , step S3 comprises:

[0074] S31: Determine whether the bus voltage of all the faulty high-voltage components is above a preset threshold value, if so, proceed to S33, if not, proceed to S34;

[0075] S32: Determine whether the bus voltage of at least one of the faulty high-voltage components is less than a preset threshold value, if so, proceed to S35, if not, proceed to S33;

[0076] S33: Determine that the low voltage interlock connection of the fault circuit is abnormal;

[0077] S34: Determine that the battery pack high voltage plug-in on the fault circuit is faulty;

[0078] S35: Determine that the first high-voltage plug-in of the at least one faulty high-voltage component is faulty;

[0079] The preset threshold is represented as half of the battery pack voltage value.

[0080] In one embodiment, the low-voltage interlock connection abnormality in step S33 is characterized by that the high-voltage connection of the interlocking circuit is normal, and the connection of the low-voltage interlocking circuit at one of the first high-voltage plug-ins is abnormal. However, this fault state cannot quickly locate the fault point through the present method, and further troubleshooting is required between the first high-voltage plug-in and the low-voltage interlock wiring harness in the circuit. However, compared with conventional troubleshooting, the first low-voltage plug-in does not need to be checked, thereby improving detection efficiency.

[0081] In another embodiment, the fault of the battery pack high-voltage plug-in on the faulty circuit in step S34 is characterized by an abnormal connection between the battery pack high-voltage plug-in on the interlocking circuit and the high-voltage wiring harness.

[0082] In other embodiments, the failure of the first high-voltage plug-in of the at least one faulty high-voltage component in step S35 is characterized by abnormal connection between the first high-voltage plug-in of the at least one faulty high-voltage component and the high-voltage wiring harness.

[0083] Regarding fault judgment, in one example, the bus voltage may be an invalid value or cannot be obtained. This fault state is caused by a poor connection between the first low-voltage plug-in of the high-voltage component, or it may be caused by network fluctuations or abnormalities in the low-voltage wiring harness adapter plug-in, etc., and has nothing to do with the interlocking fault of the present invention.

[0084] In another example, if the interlock detection module in step S2 does not detect an interlock circuit fault, but the vehicle controller determines that the bus voltage of a high-voltage component is less than half of the current voltage of the battery pack (i.e., the preset threshold), it can be considered as a fuse abnormality or other fault and has nothing to do with the interlock fault of the present invention.

[0085] In other preferred embodiments, before step S33, the following steps are further included:

[0086] S330: Obtain the voltage of the battery pack.

[0087] Regarding the interlock detection process, in one embodiment, please refer to Figure 3, the interlock detection module 1 detects that the HVIL1 (i.e., the interlock circuit) is interlocked and open, and sends the fault information of the interlock circuit to the vehicle controller 7. The vehicle controller 7 also determines that the bus voltage of the high-voltage component 2 on the circuit is less than half of the current voltage of the battery pack, and can determine that the high-voltage connection of the high-voltage component 2 is abnormal. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that it is still possible to modify the technical solutions recorded in the above embodiments, or to replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. An interlock detection system, characterized in that: include: An interlock detection module, a plurality of high-voltage components, a battery pack, a high-voltage wiring harness, and a low-voltage interlock wiring harness; the battery pack includes a battery pack low-voltage plug-in and a plurality of battery pack high-voltage plug-ins, the plurality of high-voltage components each include a first high-voltage plug-in and a first low-voltage plug-in, the high-voltage wiring harness includes a first high-voltage wiring harness and a second high-voltage wiring harness, and the low-voltage interlock wiring harness includes a first low-voltage interlock wiring harness and a second low-voltage interlock wiring harness; Among them, the interlock detection module is integrated in the battery pack, and the first end of the interlock detection module is connected to the first input end and the second input end of the several high-voltage components through the first low-voltage interlock wiring harness and the second low-voltage interlock wiring harness, and the first output end and the second output end of the several high-voltage components are respectively connected to the positive pole and the negative pole of the high-voltage plug-in of the battery pack to form a number of interlocking loops.

2. The interlock detection system according to claim 1, characterized in that: It also includes a vehicle controller, which is connected to the several high-voltage components and the battery pack through CAN communication.

3. The interlock detection system according to claim 2, characterized in that: It also includes a diagnostic port, which is connected to the vehicle controller and the battery pack through the CAN communication.

4. A high-voltage system, characterized in that: The invention comprises the interlock detection system as described in any one of claims 1 to 3.

5. A new energy vehicle, characterized in that: Includes the high voltage system as claimed in claim 4.

6. A high-voltage interlock detection and fault location method, applied to the interlock detection system according to any one of claims 1 to 3, characterized in that: include: S1: Acquire interlocking signals of the plurality of interlocking circuits and bus voltages of the plurality of high-voltage components; S2: Based on the interlocking signals of the plurality of interlocking circuits, determining a faulty interlocking circuit; S3: Determine the fault point based on the bus voltage of the faulty high-voltage component in the fault interlocking circuit.

7. The high-voltage interlock fault detection and positioning method according to claim 6, characterized in that: The determining of the fault point based on the bus voltage of the faulty high-voltage component in the fault interlocking circuit comprises: S31: Determine whether the bus voltage of all the faulty high-voltage components is above a preset threshold value, if so, proceed to S33, if not, proceed to S34; S32: Determine whether the bus voltage of at least one of the faulty high-voltage components is less than a preset threshold value, if so, proceed to S35, if not, proceed to S33; S33: Determine that the low voltage interlock connection of the fault interlock circuit is abnormal; S34: Determine that the battery pack high voltage plug-in on the fault interlocking circuit is faulty; S35: Determine that the first high-voltage plug-in of the at least one faulty high-voltage component is faulty; The preset threshold is represented as half of the battery pack voltage value.

8. The high-voltage interlock fault detection and positioning method according to claim 7, characterized in that: Before step S33, the following steps are also included: S330: obtaining the voltage of the battery pack.

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