CN109490808B - Method, system and storage medium for correcting voltage acquisition error of insulation detection module - Google Patents
Method, system and storage medium for correcting voltage acquisition error of insulation detection module Download PDFInfo
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- CN109490808B CN109490808B CN201811503946.4A CN201811503946A CN109490808B CN 109490808 B CN109490808 B CN 109490808B CN 201811503946 A CN201811503946 A CN 201811503946A CN 109490808 B CN109490808 B CN 109490808B
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Abstract
The embodiment of the invention provides a method, a system and a storage medium for correcting voltage acquisition errors of an insulation detection module, and belongs to the field of battery management systems. The method comprises the following steps: inputting a standard voltage to the insulation detection module; receiving the detected acquisition voltage through the insulation detection module; calculating error precision according to the acquired voltage and the standard voltage; judging whether the error precision is smaller than a preset precision requirement or not; and under the condition that the error precision is judged to be greater than or equal to the precision requirement, inputting an error calibration formula into the insulation detection module to correct the insulation detection module. The method, the system and the storage medium calculate by collecting the collected voltage of the insulation detection module and the pre-input standard voltage, and correct the collected voltage output by the insulation detection module in a mode of inputting the fitted formula to the insulation detection module, so that the detection precision of the insulation detection module is improved, and the detection error of the voltage is reduced.
Description
Technical Field
The invention relates to the field of battery management systems, in particular to a method and a system for correcting voltage acquisition errors of an insulation detection module and a storage medium.
Background
The insulation detection module (HVU) is an important component of a Battery Management System (BMS), and is used to realize the functions of System power supply, System power consumption, Battery pack insulation performance detection, Battery pack voltage detection, CAN communication, and the like. And a main control module (BCU) of the BMS judges the safety of the whole vehicle according to the total voltage of the battery pack and the insulation state of the battery system detected by the HVU. In the HVU, the collection of battery pack voltage is mainly divided into two paths: one path is responsible for total voltage acquisition of the battery pack, and the other path is responsible for precharge voltage acquisition. However, the accuracy of ID acquisition of the optocoupler isolated operational amplifier and the single chip microcomputer in the HVU is low, which causes errors in voltage acquisition. At present, a common voltage correction method is to add a reference chip at the AD power supply of the single chip microcomputer. Although the method can effectively correct errors to a certain extent, the cost is high.
Disclosure of Invention
The invention aims to provide a method, a system and a storage medium for correcting voltage acquisition errors of an insulation detection module. The method, the system and the storage medium can improve the voltage acquisition precision of the insulation detection module and reduce the detection error.
In order to achieve the above object, an embodiment of the present invention provides a method for correcting an insulation detection module voltage acquisition error, where the method includes:
inputting a standard voltage to the insulation detection module;
receiving the detected acquisition voltage through the insulation detection module;
calculating error precision according to the acquired voltage and the standard voltage;
judging whether the error precision is smaller than a preset precision requirement or not;
and under the condition that the error precision is judged to be greater than or equal to the precision requirement, inputting an error calibration formula into the insulation detection module to correct the insulation detection module.
Optionally, the method is further for:
the error accuracy is calculated according to equation (1),
where μ is the error accuracy, U0Is the standard voltage, UxIs the acquisition voltage.
Optionally, the method is further for:
fitting a preset formula (2) with a plurality of said collected voltages and corresponding said standard voltages,
ΔU＝f(x)，(2)
wherein, Δ U is a deviation correction value of the collected voltage and a standard voltage, x is the collected voltage, and f (x) is a preset fitting function;
inputting the fitted formula (2) and formula (3) into the insulation detection module,
U＝Ux+ΔU，(3)
wherein, U is the collection voltage output outwards after the insulation detection module is corrected, UxAnd delta U is a deviation correction value calculated by the insulation detection module according to the fitted formula (2) for the collection voltage actually collected by the insulation detection module.
Optionally, the insulation detection module includes a first collection line, a second collection line and a controller;
the collecting voltage comprises a first total pressure and a second total pressure;
the first collection circuit is used for outputting the first total pressure, and the second collection circuit is used for outputting the second total pressure.
Optionally, the first collecting line includes a first voltage dividing circuit, a first signal conditioning circuit, and an ADC conversion unit, which are connected in sequence, where the first voltage dividing circuit is configured to receive the standard voltage, and the ADC conversion unit is connected to an I2C interface of the controller.
Optionally, the second collecting line includes a second voltage dividing circuit and a second signal conditioning circuit, which are connected in sequence, the second voltage dividing circuit is configured to receive the standard voltage, and the second signal conditioning circuit is connected to an ADC interface of the controller.
Another aspect of the present invention provides a system for correcting voltage acquisition errors of an insulation detection module, the system comprising:
the high-voltage power supply is used for inputting standard voltage to the insulation detection module;
and the upper computer is respectively connected with the high-voltage power supply and the insulation detection module and is used for executing any one of the methods.
Optionally, the upper computer comprises upper computer software developed based on LabVIEW.
Optionally, the system further comprises a high voltage acquisition line, a low voltage control line and a communication line;
the high-voltage acquisition line is connected between the insulation detection module and the high-voltage power supply;
the low-voltage control line is connected between the upper computer and the high-voltage power supply;
the communication line is connected between the upper computer and the insulation detection module;
the high-voltage acquisition line, the low-voltage control line and the communication line are separately wired.
Yet another aspect of the invention also provides a storage medium having stored thereon instructions for reading by a machine to cause the machine to perform a method as any one of above.
According to the technical scheme, the method, the system and the storage medium for correcting the voltage acquisition error of the insulation detection module provided by the invention calculate by acquiring the acquisition voltage of the insulation detection module and the pre-input standard voltage, and correct the acquisition voltage output by the insulation detection module in a mode of inputting the fitted formula to the insulation detection module, so that the detection precision of the insulation detection module is improved, and the detection error of the voltage is reduced.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a method of correcting insulation detection module voltage acquisition errors according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of an insulation detection module according to one embodiment of the present invention; and
fig. 3 is a schematic structural diagram of a system for correcting voltage acquisition errors of an insulation detection module according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a method for correcting voltage acquisition errors of an insulation detection module according to an embodiment of the present invention. In fig. 1, the method may include:
in step S10, a standard voltage is input to the insulation detection module. In this embodiment, this step may be performed by using a system for correcting voltage acquisition errors of the insulation detection module as shown in fig. 2. In fig. 2, the system may include a high voltage power supply 01 and an upper computer 02. The high-voltage power supply 01 can be used for inputting standard voltage to the insulation detection module 03, and the upper computer 02 can be used for controlling the high-voltage power supply 01 to output the standard voltage.
In step S11, the detected pickup voltage is received by the insulation detection module. Taking the system in fig. 2 as an example, the upper computer 02 may be connected to the insulation detection module 03, and is configured to receive the collected voltage collected by the insulation detection module 03 through the insulation detection module 03.
In step S12, an error accuracy is calculated from the collected voltage and the standard voltage. In fig. 2, this step can be implemented by the upper computer 02. In addition, the way of calculating the error accuracy may also be known by those skilled in the art, but in one example of the present invention, preferably, the way of calculating the error accuracy may be to calculate the error accuracy according to equation (1) for example,
where μ is the error accuracy, U0Is a standard voltage, UxTo collect voltage.
In step S13, it is determined whether the error accuracy is less than a preset accuracy requirement. In the prior art, each insulation detection module has the problem of inaccurate voltage collection due to various factors during production. In the actual use process, the precision of voltage acquisition of each insulation detection module needs to meet a preset condition. Therefore, in order to determine whether the insulation detection module needs to be corrected, the calculated error precision may be compared with a preset precision requirement, and it is determined whether the error precision is smaller than the precision requirement, so as to further determine whether the insulation detection module needs to be corrected. In this embodiment, the range of the precision requirement may be determined according to the application field of the actual insulation detection module, and should be known to those skilled in the art.
When the error precision is judged to be smaller than the precision requirement, the insulation detection module is qualified at this moment, so that the method can be directly finished without correction.
In step S14, in the case where it is determined that the error accuracy is greater than or equal to the accuracy requirement, an error calibration formula is input to the insulation detection module to correct the insulation detection module. In an example of the present invention, the step S14 may specifically include:
fitting a preset formula (2) by adopting a plurality of collected voltages and corresponding standard voltages,
ΔU＝f(x)，(2)
wherein, Δ U is a deviation correction value of the collected voltage and the standard voltage, x is the collected voltage, and f (x) is a preset fitting function. The fitting function may be determined according to the corresponding relationship between the collected voltage and the standard voltage, and in one example of the present invention, the fitting function may be, for example, formula (3),
ΔU＝ax2+bx+c，(3)
wherein, the delta U is a deviation correction value of the collected voltage and the standard voltage, and a, b and c are preset parameters;
inputting the fitted formula (2) and formula (3) into an insulation detection module,
U＝Ux+ΔU，(3)
wherein, U is the collection voltage of the external output after the insulation detection module is corrected, UxIs a heat insulationAnd delta U is a deviation correction value calculated by the insulation detection module according to the fitted formula (2) according to the collected voltage actually collected by the detection module.
Fig. 3 is a schematic structural diagram of an insulation detection module according to an embodiment of the present invention. In fig. 3, the insulation detection module may include a first acquisition line 031, a second acquisition line 032, and a controller 033.
The first collecting line 031 may be configured to output a first total voltage, and include a first voltage dividing circuit 0311, a first signal conditioning circuit 0312, and an ADC conversion unit 0313, which are connected in sequence, where the first voltage dividing circuit may be configured to receive a standard voltage of a high-voltage power supply 01, and the ADC conversion unit 0313 may be connected to an I2C interface of the controller 02.
The second collecting circuit 032 may be configured to output a second total pressure, and includes a second voltage dividing circuit 0321 and a second signal conditioning circuit 0322, which are connected in series. The second voltage dividing circuit 0321 may be used to receive a standard voltage, and the second signal conditioning circuit 0322 is connected to the ADC of the controller 033. In addition, correspondingly, the collected voltage may also include the first total voltage and the second total voltage. Therefore, when the insulation detection module is corrected, the correction can be performed respectively for the collection of the first total pressure and the second total pressure.
Another aspect of the present invention is to provide a system for correcting voltage acquisition errors of an insulation detection module as shown in fig. 2, which is described in detail above and will not be described herein again.
Further, in the system shown in fig. 2, in view of the ease of the operation of correcting the insulation detection module 03, the upper computer 02 may include upper computer software developed based on LabVIEW. Because LabVIEW is a platform adopting graphic operation instead of code programming, the adoption of the upper computer software can improve the simplicity of system operation.
In consideration of the mutual interference of high voltage and low voltage, in one embodiment of the present invention, the high voltage collection line (thicker connection line in fig. 3) may be separately wired from the low voltage control line and the communication line (thinner connection line in fig. 3), so as to avoid the interference of the high voltage collection line on the low voltage control line and the communication line. The high-voltage acquisition line is connected between the insulation detection module and the high-voltage power supply, the low-voltage control line is connected between the upper computer and the high-voltage power supply, and the communication line is connected between the upper computer and the insulation detection module.
Yet another aspect of the present invention also provides a storage medium storing instructions for reading by a machine to cause the machine to perform any of the methods described above.
According to the technical scheme, the method, the system and the storage medium for correcting the voltage acquisition error of the insulation detection module provided by the invention calculate by acquiring the acquisition voltage of the insulation detection module and the pre-input standard voltage, and correct the acquisition voltage output by the insulation detection module in a mode of inputting the fitted formula to the insulation detection module, so that the detection precision of the insulation detection module is improved, and the detection error of the voltage is reduced.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different embodiments of the present invention may be arbitrarily combined with each other, and the embodiments of the present invention should be considered as disclosed in the disclosure of the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A method of correcting voltage acquisition errors of an insulation detection module, the method comprising:
inputting a standard voltage to the insulation detection module;
receiving the detected acquisition voltage through the insulation detection module;
calculating error accuracy according to the collected voltage and the standard voltage, and specifically comprising: performing curve fitting by adopting a plurality of the collected voltages and the corresponding standard voltage formula (2),
ΔU＝f(x)＝ax2+bx+c， (2)
wherein a, b and c are parameters to be fitted, and x is the acquisition voltage;
judging whether the error precision is smaller than a preset precision requirement or not;
inputting an error calibration formula to the insulation detection module to correct the insulation detection module when the error accuracy is greater than or equal to the accuracy requirement, wherein the error calibration formula is formula (3),
U＝Ux+ΔU， (3)
wherein, U is the collection voltage output outwards after the insulation detection module is corrected, UxAnd delta U is a deviation correction value calculated by the insulation detection module according to the fitted formula (2) for the collection voltage actually collected by the insulation detection module.
2. The method of claim 1, wherein the method is further configured to:
the error accuracy is calculated according to equation (1),
where μ is the error accuracy, U0Is the standard voltage, UxIs the acquisition voltage.
3. The method of claim 1, wherein the insulation detection module comprises a first acquisition line, a second acquisition line, and a controller;
the collecting voltage comprises a first total pressure and a second total pressure;
the first collection circuit is used for outputting the first total pressure, and the second collection circuit is used for outputting the second total pressure.
4. The method of claim 3, wherein the first acquisition circuit comprises a first voltage divider circuit, a first signal conditioning circuit and an ADC conversion unit connected in sequence, the first voltage divider circuit is used for receiving the standard voltage, and the ADC conversion unit is connected with an I2C interface of the controller.
5. The method of claim 4, wherein the second acquisition circuit comprises a second voltage divider circuit and a second signal conditioning circuit connected in series, the second voltage divider circuit being configured to receive the reference voltage, the second signal conditioning circuit being connected to an ADC interface of the controller.
6. A system for correcting voltage acquisition errors of an insulation detection module, the system comprising:
the high-voltage power supply is used for inputting standard voltage to the insulation detection module;
the upper computer is respectively connected with the high-voltage power supply and the insulation detection module and is used for executing the method of any one of claims 1 to 5.
7. The system of claim 6, wherein the upper computer comprises upper computer software developed based on LabVIEW.
8. The system of claim 6, further comprising a high pressure collection line, a low pressure control line, and a communication line;
the high-voltage acquisition line is connected between the insulation detection module and the high-voltage power supply;
the low-voltage control line is connected between the upper computer and the high-voltage power supply;
the communication line is connected between the upper computer and the insulation detection module;
the high-voltage acquisition line, the low-voltage control line and the communication line are separately wired.
9. A storage medium storing instructions for reading by a machine to cause the machine to perform a method according to any one of claims 1 to 5.
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