CN112748307A - High-voltage insulation fault detection device - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application of the invention discloses a high-voltage insulation fault detection device, which comprises: the acquisition module is used for acquiring a detection instruction; the control module is used for controlling the plurality of high-voltage contactors to be closed in sequence according to a preset sequence; the high-voltage contactors respectively control the opening and closing of different branches; and the detection module is used for respectively calculating the resistances of the different closed branches to obtain detection results. The method solves the technical problems that the insulation detector of the pure electric vehicle is difficult to judge a specific fault branch circuit after a fault occurs in a high-voltage main loop, and the insulation detector needs to manually adopt multimeters for one-to-one detection, so that the fault detection is high in specificity, needs professional personnel, and is time-consuming and labor-consuming.
Description
Technical Field
The invention relates to the field of pure electric vehicles, in particular to a high-voltage insulation fault detection device.
Background
Pure electric vehicles use a vehicle-mounted power supply as power, and the voltage range is usually as follows: 350V-700V, and high-voltage distribution distributes power to each component, wherein the high-voltage distributor distributes high voltage of each branch circuit through each branch circuit high-voltage contactor. Usually, there is a detection device for insulation resistance value on the main loop to monitor the insulation value of the whole vehicle high-voltage system in real time to determine the high-voltage safety, and when the detection value is lower than the set value, the main branch high-voltage relay is cut off to ensure the safety. At present, each high-voltage part is required to reach the IP67 grade, but in actual use, particularly when an automobile faces various complex harsh environments, the whole automobile insulation fault can be caused greatly, and because the insulation detector is in a high-voltage main loop, a specific fault branch circuit is difficult to judge after the fault occurs, a multimeter is required to be manually adopted for one-to-one detection, a professional is required, and time and labor are wasted.
Disclosure of Invention
The invention mainly aims to provide a high-voltage insulation fault detection method, a high-voltage insulation fault detection device, electronic equipment and a high-voltage insulation fault detection system, which can quickly, simply and conveniently detect a specific branch in an insulation fault of a whole vehicle on the basis of not increasing hardware cost; the insulation detector for the pure electric vehicle is used for solving the technical problems that a specific fault branch circuit is difficult to judge after a fault occurs in a high-voltage main loop, universal meters are needed to be manually adopted for one-to-one detection, the fault detection specialty is high, a professional is needed, and time and labor are wasted.
In order to achieve the above object, according to one aspect of the present application, there is provided a high voltage insulation fault detection method.
The high-voltage insulation fault detection method comprises the following steps:
acquiring a fault detection instruction;
controlling a plurality of high-voltage contactors to be closed in sequence according to a preset sequence; the high-voltage contactors respectively control the opening and closing of different branches;
and respectively calculating the resistance of the different closed branches to obtain a detection result.
Further, the calculating the resistances of the different closed branches respectively to obtain the detection results includes,
calculating the resistance R of the whole vehicle high-voltage system after closing the high-voltage contactor of the nth branchn；
According to the resistance R of the high-voltage system of the whole vehicle after closing the high-voltage contactor of the nth branchnThe resistance value R of the high-voltage system of the whole vehicle after the high-voltage contactor of the (n-1) th branch is closedn-1Comparing to obtain the resistance r of the nth branchn；
The resistance r of the nth branchnAnd comparing the resistance value with a preset insulation resistance value r to obtain a detection result.
Furthermore, the resistance value R of the high-voltage system of the whole vehicle is obtained according to the closed high-voltage contactor of the nth branchnThe resistance value R of the high-voltage system of the whole vehicle after the high-voltage contactor of the (n-1) th branch is closedn-1Comparing to obtain the resistance r of the nth branchnThe method comprises the following steps:
calculating the resistance r of the nth branch circuit based on the following formulan；
Wherein r isnIs the resistance of the nth branch, RnThe resistance value R of the high-voltage system of the whole automobile behind the high-voltage contactor of the nth branchn-1The resistance value of the whole vehicle high-voltage system is obtained after the high-voltage contactor of the (n-1) th branch is closed.
Further, the resistance r of the nth branch is adjustednComparing with a preset insulation resistance value r to obtain a detection result, wherein the detection result comprises the following steps:
when r isnWhen r is less than or equal to r, the corresponding branch circuit is insulated and has a fault;
when r isnAnd if the voltage is more than r, the corresponding branch circuit is insulated and has no fault, and the high-voltage contactor of the (n + 1) th branch circuit is continuously closed.
Further, the acquiring the detection instruction includes:
and reporting high-voltage insulation fault triggering through the whole vehicle.
Further, the step of calculating the resistances of the different closed branches respectively to obtain the detection results further includes reporting and displaying the detection results.
In order to achieve the above object, according to another aspect of the present application, there is provided a high voltage insulation fault detection apparatus.
The high-voltage insulation fault detection device according to the present application comprises:
the acquisition module is used for acquiring a detection instruction;
the control module is used for controlling the plurality of high-voltage contactors to be closed in sequence according to a preset sequence; the high-voltage contactors respectively control the opening and closing of different branches;
and the detection module is used for respectively calculating the resistances of the different closed branches to obtain detection results.
In order to achieve the above object, according to another aspect of the present application, there is provided an electronic apparatus.
An electronic device according to the present application includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to cause the at least one processor to perform the high voltage insulation fault detection method of any one of the above.
In order to achieve the above object, according to another aspect of the present application, there is provided a high voltage insulation fault detection device system.
The high voltage insulation fault detection device system according to the present application comprises: the electronic equipment is connected with the plurality of high-voltage contactors.
Further, the method also comprises the following steps:
and the fault detection starting device is connected with the electronic equipment and used for outputting a fault detection instruction.
In the embodiment of the invention, a method for detecting the insulation fault of the high-voltage part is provided by adopting a mode of setting a detection method and providing a method for detecting the insulation fault of the high-voltage part for the existing insulation detection technology, so that the aim of quickly and simply detecting a specific branch circuit in the insulation fault of the whole vehicle is achieved on the basis of not increasing the hardware cost, the technical effects of reducing the detection cost and the professional auxiliary requirement are realized, and the technical problems that the insulation detector of the pure electric vehicle is difficult to judge the specific fault branch circuit after the fault occurs in a high-voltage main loop, and the manual multimeter is adopted for one-by-one detection, so that the fault detection is high in specialty, needs professionals, and wastes time and labor are solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the invention and to make further features, objects, and advantages of the invention apparent. The drawings and their description illustrate exemplary embodiments of the invention and do not limit it inappropriately. In the drawings:
FIG. 1 is a flow chart of a high voltage insulation fault detection method according to an embodiment of the claimed invention;
fig. 2 is a high-voltage electrical topology diagram inside a PDU corresponding to a high-voltage insulation fault detection method according to an embodiment of the present invention.
Detailed Description
In order to make the person skilled in the art better understand the application scheme of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, shall fall within the scope of protection of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present application are described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the drawings.
The invention relates to a high-voltage insulation fault detection method, which comprises the following steps:
101: triggering fault detection by reporting a high-voltage insulation fault through the whole vehicle;
102: acquiring a fault detection instruction;
103: controlling a plurality of high-voltage contactors to be closed in sequence according to a preset sequence; the high-voltage contactors respectively control the opening and closing of different branches;
according to the resistance R of the high-voltage system of the whole vehicle after closing the high-voltage contactor of the nth branchnThe resistance value R of the high-voltage system of the whole vehicle after the high-voltage contactor of the (n-1) th branch is closedn-1Comparing to obtain the resistance r of the nth branchnThe method comprises the following steps:
calculating the resistance r of the nth branch circuit based on the following formulan；
Wherein r isnIs the resistance of the nth branch, RnThe resistance value R of the high-voltage system of the whole automobile behind the high-voltage contactor of the nth branchn-1The resistance value of the whole vehicle high-voltage system is obtained after the high-voltage contactor of the (n-1) th branch is closed.
The resistance r of the nth branchnComparing with a preset insulation resistance value r to obtain a detection result, wherein the detection result comprises the following steps:
when r isnWhen r is less than or equal to r, the corresponding branch circuit is insulated and has a fault;
when r isnAnd if the voltage is more than r, the corresponding branch circuit is insulated and has no fault, and the high-voltage contactor of the (n + 1) th branch circuit is continuously closed.
104: and respectively calculating the resistance of the different closed branches to obtain a detection result.
The calculating the resistance of the different closed branches respectively to obtain the detection results comprises,
after calculating the high-voltage contactor of the n branchResistance R of whole vehicle high-voltage systemn；
According to the resistance R of the high-voltage system of the whole vehicle after closing the high-voltage contactor of the nth branchnThe resistance value R of the high-voltage system of the whole vehicle after the high-voltage contactor of the (n-1) th branch is closedn-1Comparing to obtain the resistance r of the nth branchn；
The resistance r of the nth branchnAnd comparing the resistance value with a preset insulation resistance value r to obtain a detection result.
S4: and reporting and displaying the detection result.
According to another aspect of the present application there is provided a high voltage insulation fault detection apparatus comprising
The acquisition module is used for acquiring a detection instruction;
the control module is used for controlling the plurality of high-voltage contactors to be closed in sequence according to a preset sequence; the high-voltage contactors respectively control the opening and closing of different branches;
and the detection module is used for respectively calculating the resistances of the different closed branches to obtain detection results.
In order to achieve the above object, according to another aspect of the present application, there is provided an electronic apparatus.
An electronic device according to the present application includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to cause the at least one processor to perform the high voltage insulation fault detection method of any one of the above.
In order to achieve the above object, according to another aspect of the present application, there is provided a high voltage insulation fault detection device system.
The high voltage insulation fault detection device system according to the present application comprises: the electronic equipment is connected with the plurality of high-voltage contactors.
Further, the method also comprises the following steps:
and the fault detection starting device is connected with the electronic equipment and used for outputting a fault detection instruction.
In a specific practical application, as shown in figure 1,
s1, adding a high-voltage insulation detection button (an instrument button can be used), and the button switch is in butt joint with the vehicle controller;
s2 the whole vehicle Controller CAN Controller local Area Network bus (CAN) communication protocol adds the high voltage component insulation detection function, the high voltage distribution system receives the signal;
s3, when the whole vehicle has a high-voltage insulation fault, pressing a high-voltage insulation detection button to electrify the whole vehicle again;
s4, after the power is on, the VCU Vehicle Control Unit (VCU) sends out a high-voltage component insulation detection instruction, and the high-voltage component insulation detection instruction is received by the high-voltage distribution box and enters into insulation fault detection;
s5, the high-voltage contactor is controlled to be closed Kn in a certain sequence, and the resistance Rn of the whole vehicle high-voltage system after the high-voltage contactor is closed each time is detected in real time.
S6, comparing Rn (Rn, reaction Native, abbreviation, reaction Native development environment) with Rn-1 of the previous time, and calculating the resistance Rn of the Kn branch by a formula.
S7, comparing rn with an insulation resistance value r (r is obtained by estimating according to a whole vehicle high-voltage framework) required by a reference national standard;
rn is less than or equal to r: the insulation fault of the branch can be judged and sent to the instrument for display through the can bus protocol.
rn > r: continuing to close the Kn +1 high-voltage contactor to carry out the judgment in the step 1) until the fault branch is detected.
And S8, after the maintenance is finished, pressing the high-voltage insulation detection button again, exiting the mode, and allowing the whole vehicle to recover and count the normal high-voltage-on process.
Wherein,
r can be amplified properly according to the whole vehicle high-voltage framework loop by referring to 500 omega/V in GB-T18384-2015, wherein r is 500K omega in the example. The high-voltage insulation fault detection method corresponding to the related application of the invention corresponds to a high-voltage electrical topological diagram inside the PDU, as shown in FIG. 2.
In the driving process, the whole vehicle suddenly reports a three-level fault of an insulation fault, a driver stops the vehicle while keeping the vehicle, and the whole vehicle is powered off; pressing a high-voltage insulation detection button by a driver, and electrifying the whole vehicle to enter high-voltage insulation; the whole vehicle controller closes the high-voltage relays of all the branches in sequence and detects the insulation resistance value of the current whole loop; when the air conditioner high-voltage contactor is closed, detecting that the resistance Rn of the whole vehicle high-voltage system is very low after the high-voltage contactor is closed every time in real time, and calculating that the resistance Rn of a high-voltage component branch of an air conditioner compressor is 20K omega, which is originally lower than the national standard of 500K omega; therefore, the whole vehicle controller positions that an insulation fault occurs in the air conditioner branch circuit, and the instrument reports the fault to quickly identify the problem of the branch circuit; after the maintenance is finished, the high-voltage insulation detection button is pressed again, the mode is exited, and the whole vehicle is recovered to enter a normal power-on process.
In the embodiment of the invention, a method for detecting the insulation fault of the high-voltage part is provided by adopting a mode of setting a detection method and providing a method for detecting the insulation fault of the high-voltage part for the existing insulation detection technology, so that the aim of quickly and simply detecting a specific branch circuit in the insulation fault of the whole vehicle is achieved on the basis of not increasing the hardware cost, the technical effects of reducing the detection cost and the professional auxiliary requirement are realized, and the technical problems that the insulation detector of the pure electric vehicle is difficult to judge the specific fault branch circuit after the fault occurs in a high-voltage main loop, and the manual multimeter is adopted for one-by-one detection, so that the fault detection is high in specialty, needs professionals, and wastes time and labor are solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A high voltage insulation fault detection device, comprising:
the acquisition module is used for acquiring a detection instruction;
the control module is used for controlling the plurality of high-voltage contactors to be closed in sequence according to a preset sequence; the high-voltage contactors respectively control the opening and closing of different branches;
and the detection module is used for respectively calculating the resistances of the different closed branches to obtain detection results.
2. A high voltage insulation fault detection apparatus as claimed in claim 1,
the detection module respectively calculates the resistances of the different closed branches, and the detection result includes:
calculating the resistance R of the whole vehicle high-voltage system after closing the high-voltage contactor of the nth branchn；
According to the resistance R of the high-voltage system of the whole vehicle after closing the high-voltage contactor of the nth branchnThe resistance value R of the high-voltage system of the whole vehicle after the high-voltage contactor of the (n-1) th branch is closedn-1Comparing to obtain the resistance r of the nth branchn；
The resistance r of the nth branchnAnd comparing the resistance value with a preset insulation resistance value r to obtain a detection result.
3. A high voltage insulation fault detection apparatus as claimed in claim 2,
the detection module closes the resistance R of the high-voltage system of the whole vehicle according to the high-voltage contactor of the nth branchnThe resistance value R of the high-voltage system of the whole vehicle after the high-voltage contactor of the (n-1) th branch is closedn-1Comparing to obtain the resistance r of the nth branchnThe method comprises the following steps:
calculating the resistance r of the nth branch circuit based on the following formulan；
Wherein r isnIs the resistance of the nth branch, RnThe resistance value R of the high-voltage system of the whole automobile behind the high-voltage contactor of the nth branchn-1The resistance value of the whole vehicle high-voltage system is obtained after the high-voltage contactor of the (n-1) th branch is closed.
4. The apparatus according to claim 2, wherein the detection module detects the resistance r of the nth branchnComparing with a preset insulation resistance value r to obtain a detection result, wherein the detection result comprises the following steps:
when r isnWhen r is less than or equal to r, the corresponding branch circuit is insulated and has a fault;
when r isnAnd if the voltage is more than r, the corresponding branch circuit is insulated and has no fault, and the high-voltage contactor of the (n + 1) th branch circuit is continuously closed.
5. The high voltage insulation fault detection device according to claim 1, wherein the obtaining module obtains the detection instruction comprises:
and reporting high-voltage insulation fault triggering through the whole vehicle.
6. The apparatus according to claim 1, wherein the detection module calculates the resistances of the different closed branches, and reports and displays the detection results.
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| CN112373309A (en) * | 2020-11-24 | 2021-02-19 | 东风华神汽车有限公司 | Method and system for automatically positioning insulation failure high-voltage component of new energy vehicle |
| CN114103646A (en) * | 2021-11-19 | 2022-03-01 | 金琥新能源汽车(成都)有限公司 | Insulation fault detection method and device, whole vehicle high-voltage loop and electric vehicle |
| CN114839497B (en) * | 2022-07-06 | 2022-11-11 | 中国重汽集团济南动力有限公司 | Rapid insulation monitoring fault positioning system and method for electric automobile |
| CN116754938B (en) * | 2023-08-21 | 2023-12-15 | 新誉集团有限公司 | Fault detection method and system for contactor of air conditioning equipment in air conditioning unit |
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Also Published As
| Publication number | Publication date |
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| CN111624448B (en) | 2021-02-12 |
| CN112782536A (en) | 2021-05-11 |
| CN111624448A (en) | 2020-09-04 |
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