Fault diagnosis method and device of battery acquisition system and electric equipment

Abstract

The invention provides a fault diagnosis method and device for a battery acquisition system and electric equipment. The method comprises the following steps: acquiring a first performance parameter and a second performance parameter of a battery; determining a drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold value; according to the method, in an operation scene without high-frequency interference injection, the drift failure direction of the battery acquisition system is distinguished, whether drift in the unique direction of the battery acquisition system fails or not is recognized in time, and in the operation scene with high-frequency interference injection, fault diagnosis is performed on the battery acquisition system in the unique direction. And by determining the duration of the drift failure direction, the conditions of misjudgment and missed judgment of the failure fault of the battery acquisition system are reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a fault diagnosis method, device and electrical equipment of a battery acquisition system. Background Art

[0002] In the related art, due to the difference in the response time of sensor sampling, interference fluctuations occur, which can easily lead to misjudgment or omission of battery failure. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of the present invention is to propose a fault diagnosis method for a battery collection system. In an operating scenario without high-frequency interference injection, the method can distinguish the direction of drift failure of the battery collection system and promptly identify whether the unique direction drift of the battery collection system is faulty. In an operating scenario with high-frequency interference injection, the method can reduce the misjudgment and omission of battery collection system failure by determining the duration of the drift failure direction.

[0005] Therefore, a second object of the present invention is to provide a fault diagnosis device for a battery collection system.

[0006] To this end, a third object of the present invention is to provide an electrical device.

[0007] To this end, a fourth object of the present invention is to provide a computer-readable storage medium.

[0008] To this end, a fifth object of the present invention is to provide a computer program product.

[0009] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a fault diagnosis method for a battery acquisition system, the method comprising: obtaining a first performance parameter and a second performance parameter of the battery; determining a drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold; and performing fault diagnosis on the battery acquisition system according to the duration of the drift failure direction.

[0010] According to the fault diagnosis method of the battery acquisition system of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0011] In some embodiments, the battery acquisition system includes a first acquisition component and a second acquisition component, and acquiring the first performance parameter and the second performance parameter of the battery includes: the first acquisition component acquires the first performance parameter; the second acquisition component acquires the second performance parameter.

[0012] In some embodiments, determining the drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold includes: determining the difference between the first performance parameter and the second performance parameter; when the difference is greater than or equal to the preset sampling threshold, determining that the first acquisition component has a positive drift failure; when the difference is less than the preset sampling threshold, determining that the first acquisition component has a negative drift failure.

[0013] In some embodiments, fault diagnosis of the battery acquisition system is performed based on the duration of the drift failure direction, including: when it is determined that the first acquisition component has a forward drift failure, obtaining the forward duration of the forward drift failure; if the forward duration is greater than or equal to the preset time threshold, determining that the first acquisition component is faulty.

[0014] In some embodiments, fault diagnosis of the battery acquisition system is performed based on the duration of the drift failure direction, including: when determining that the first acquisition component has a negative drift failure, obtaining the negative duration of the negative drift failure; if the negative duration is greater than or equal to the preset time threshold, determining that the first acquisition component is faulty.

[0015] In some embodiments, obtaining the forward duration of the forward drift failure includes: obtaining a first drift count value and a first sampling period of the first acquisition component; determining the product of the first drift count value and the first sampling period, and using the product as the forward duration.

[0016] In some embodiments, obtaining the negative duration of the negative drift failure includes: obtaining a second drift count value and a second sampling period of the second acquisition component; determining the product of the second drift count value and the second sampling period, and using the product as the negative duration.

[0017] In some embodiments, fault diagnosis of the battery acquisition system is performed according to the duration of the drift failure direction, and further includes: obtaining an effective proportion coefficient; determining the product of the effective proportion coefficient and the preset time threshold, and determining the effective time threshold according to the product; when the positive duration is greater than or equal to the effective time threshold, determining the accumulated first drift count value of the first acquisition component; when the positive duration is less than the effective time threshold, clearing the first drift count value of the first acquisition component.

[0018] In some embodiments, after determining the effective time threshold, it also includes: when the negative duration is greater than or equal to the effective time threshold, determining the accumulated second drift count value of the second acquisition component; when the negative duration is less than the effective time threshold, clearing the second drift count value of the second acquisition component.

[0019] In some embodiments, after determining that the first acquisition component fails, it includes: controlling the battery acquisition system to enter a preset mode.

[0020] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a fault diagnosis device for a battery acquisition system, the device comprising: an acquisition module, used to acquire a first performance parameter and a second performance parameter of the battery; a determination module, used to determine a drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold; and a judgment module, used to perform fault diagnosis on the battery acquisition system according to the duration of the drift failure direction.

[0021] According to the fault diagnosis device of the battery acquisition system of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0022] In order to achieve the above-mentioned object, an embodiment of a third aspect of the present invention provides an electric device, and the electric device comprises: a fault diagnosis device of a battery collection system as described in the above-mentioned embodiment.

[0023] According to the electric device of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of the drift failure of the battery acquisition system, it is timely identified whether the unique direction drift of the battery acquisition system is faulty. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0024] In order to achieve the above-mentioned purpose, an embodiment of the fourth aspect of the present invention proposes a computer-readable storage medium, on which a fault diagnosis program of a battery acquisition system is stored. When the fault diagnosis program of the battery acquisition system is executed by a processor, the fault diagnosis method of the battery acquisition system described in the above-mentioned embodiment is implemented.

[0025] In order to achieve the above object, an embodiment of a fifth aspect of the present invention provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, the fault diagnosis method of the battery acquisition system described in the above embodiment is implemented.

[0026] According to the computer program product of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic diagram of the structure of a heterogeneous sensor used in the related art;

[0030] Figure 2 is a schematic diagram of defining a preset sampling threshold in the related art;

[0031] Figure 3 is a schematic diagram of interference current fluctuation in the related art;

[0032] Figure 4 is a schematic diagram of increasing a preset sampling threshold in the related art;

[0033] Figure 5 is a flow chart of a fault diagnosis method of a battery collection system according to an embodiment of the present invention;

[0034] Figure 6 is a flow chart of a fault diagnosis method of a battery collection system according to a specific embodiment of the present invention;

[0035] Figure 7 is a structural block diagram of a fault diagnosis device for a battery acquisition system according to an embodiment of the present invention;

[0036] Figure 8 is a structural block diagram of an electric device according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] Fault diagnosis device 2 of battery collection system;

[0039] Acquisition module 21; determination module 22; judgment module 23;

[0040] Electrical equipment 3. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0042] In battery systems with functional safety requirements, in order to avoid the loss of current protection function due to failure of electronic and electrical devices, corresponding failure diagnosis coverage requirements are proposed in the functional modules. For example, in the current sampling module, two heterogeneous sensors are generally defined at the system level for current sampling. The current values ​​sampled by the two heterogeneous sensors are verified and calculated to determine functional failures to improve diagnostic coverage, thereby allowing the system to enter emergency operation mode or safe state to avoid potential thermal runaway risks in the battery system after the current protection function is lost.

[0043] like Figure 1 As shown in the figure, the heterogeneous sensors commonly used in the current industry are Hall sensors based on the Hall effect and shunts based on Ohm's law. The battery collection system includes a Hall sensor sampling circuit and a shunt sampling circuit. There are three reasons for the lag in current sampling in the Hall sensor sampling branch: the rotation and displacement of the internal magnetic domains of the Hall sensor require time accumulation, that is, there is a delay in the magnetic material responding to changes in the external magnetic field intensity; the operational amplifier and sample-and-hold circuit in the Hall sensor sampling branch will affect the response time; the RC filtering effect of the Hall sensor sampling branch causes a delay, and the reason for the lag in current sampling in the shunt sampling loop is only the delay caused by the difference in common-mode inductance to the ground.

[0044] Based on the hardware structure of the above-mentioned battery acquisition system, when the high-frequency interference current signal flows through the high-voltage circuit, the current values ​​collected by different sensors may be different. The sampling value Curr1 of the Hall sensor is obtained, and the sampling value Curr2 of the shunt is obtained. The absolute value of the difference between Curr1 and Curr2 is calculated to determine whether it is within the preset sampling threshold offset. If so, that is, |Curr1-Curr2|≤offset, the current sampling function is considered to be reliable; if not, |Curr1-Curr2|>offset, the current sampling function is considered to be unreliable, and it is determined whether the current sampling module is mature for failure. It is determined that the current sampling module has a failure fault. At this time, the battery system needs to enter the preset mode.

[0045] When defining the preset sampling threshold offset, it is necessary to consider the situation where the two sensors are offset in the opposite direction to each other, such as Figure 2 As shown, that is, offset ≥ X1 + X2, in high-frequency interference conditions, due to the difference in response time between the Hall sensor and the shunt sampling, the current value received at the central processing unit (CPU) will appear Figure 3 As shown in the figure, the existing solution is very likely to trigger system failure in the operating scenario with high-frequency interference injection, and it is easy to cause false alarms. Currently, the preset sampling threshold offset can be added to prevent false triggering of system failure in such conditions, such as Figure 4As shown in the figure, the preset sampling threshold offset is improved by compressing the buffer between the performance limit and the safety protection limit. However, the negative impact is that the buffer is compressed to 0, and even the safety protection limit and the performance limit may intersect, resulting in a conflict between the safety protection threshold boundary and the performance interval, affecting the availability of the battery system.

[0046] Combine the following Figure 5 and Figure 6 The fault diagnosis method of the battery collection system according to the embodiment of the present invention is described by way of example.

[0047] like Figure 5 As shown, the fault diagnosis method of the battery collection system according to the embodiment of the present invention at least includes steps S1 and S2.

[0048] Step S1, obtaining a first performance parameter and a second performance parameter of a battery.

[0049] The performance parameters of the battery are parameters related to the normal operation of the battery. The current sampling state of the battery is determined by obtaining the performance parameters of the battery.

[0050] In an embodiment, a battery acquisition system adopts different heterogeneous acquisition components to respectively obtain performance parameters of the battery, wherein the battery acquisition system includes a first acquisition component and a second acquisition component, the first acquisition component and the second acquisition component are acquisition components of different types or using different technologies, and have different principles and methods in data acquisition, processing and transmission. The first performance parameter is acquired in real time through the first acquisition component, and the second performance parameter is acquired in real time through the second acquisition component. The above performance parameters include but are not limited to the current, voltage, temperature and other parameters of the battery. The performance parameters of the battery are acquired in real time through the heterogeneous acquisition components to provide data support for the subsequent judgment of whether the battery acquisition system is faulty.

[0051] Step S2, determining the drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold.

[0052] In an embodiment, after obtaining the first performance parameter and the second performance parameter, the difference between the first performance parameter and the second performance parameter is calculated, and the difference is compared with a preset sampling threshold value. It is determined whether a drift failure occurs in the battery acquisition system based on different comparison results, and when a drift failure occurs in the battery acquisition system, the corresponding drift failure direction is determined, including positive drift failure and negative drift failure. Compared with the existing method of comparing the absolute value of the difference with the preset sampling threshold value, the direction of the drift failure of the battery acquisition system can be distinguished, thereby timely identifying whether the unique direction drift of the battery acquisition system is faulty.

[0053] Step S3, performing fault diagnosis on the battery acquisition system according to the duration of the drift failure direction.

[0054] In an embodiment, after determining the drift failure direction of the battery acquisition system, the duration of the drift failure direction is obtained. If the duration of the drift failure direction reaches a preset time threshold, it is considered that the battery acquisition system is determined to have failed in the corresponding drift failure direction, and the battery acquisition system is determined to have failed, and the battery acquisition system is controlled to enter a preset mode such as a safe mode; conversely, if the duration of the drift failure direction does not reach the preset time threshold, it is considered that the battery has not failed in the corresponding drift failure direction, and it may be that the high-frequency interference condition has an adverse effect on the battery acquisition system, and it is determined that the battery acquisition system has not failed, and in an operating scenario with high-frequency interference injection, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0055] According to the fault diagnosis method of the battery acquisition system of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0056] It should be noted that Figure 1 The Hall sensor and shunt described above are only one specific implementation scheme of the present invention. In addition, there are other heterogeneous acquisition component schemes. Figure 1 Taking the battery data acquisition system as an example, the fault diagnosis method of the battery data acquisition system is illustrated.

[0057] In some embodiments, the drift failure direction of the battery acquisition system is determined based on the first performance parameter, the second performance parameter and the preset sampling threshold, including: determining the difference between the first performance parameter and the second performance parameter; when the difference is greater than or equal to the preset sampling threshold, determining that the first acquisition component has a positive drift failure; when the difference is less than the preset sampling threshold, determining that the first acquisition component has a negative drift failure.

[0058] In the embodiment, since the first acquisition component, i.e., the shunt, is the main sensor and the second acquisition component, i.e., the Hall sensor, is the auxiliary sensor, the auxiliary sensor is used as a judgment mechanism to diagnose the drift failure of the main sensor. After obtaining the first performance parameter Curr1 collected by the first acquisition component, i.e., the shunt, and the second performance parameter Curr2 collected by the second acquisition component, i.e., the Hall sensor, the difference between the first performance parameter Curr1 and the second performance parameter Curr2 is calculated. When the difference is greater than or equal to the preset sampling threshold offset, i.e., Curr1-Curr2≥offset, it is determined that the first acquisition component, i.e., the shunt, has a positive drift failure; when the difference is less than the preset sampling threshold offset, i.e., Curr1-Curr2<offset, it is determined that the first acquisition component, i.e., the shunt, has a negative drift failure. When performing the difference calculation, the accuracy error of the two sensors, i.e., the shunt and the Hall sensor, should be taken into account.

[0059] It can be understood that in the same system and within a certain period of time, the drift direction of the first acquisition component, i.e., the shunt, is unique. Although the drift affected by temperature may show positive and negative drift in the same battery acquisition system, the temperature drift is known and can be compensated. Based on the above conclusions, it is possible to identify the first acquisition component, i.e., the shunt, as drifting in a unique direction, thereby identifying the failure of the battery acquisition system.

[0060] In some embodiments, fault diagnosis of the battery collection system is performed based on the duration of the drift failure direction, including: when it is determined that the first collection component has a forward drift failure, the forward duration of the forward drift failure is obtained; if the forward duration is greater than or equal to a preset time threshold Timeth, it is considered that the first collection component has failed in the forward drift failure direction, and the battery collection system is determined to be faulty.

[0061] In some embodiments, fault diagnosis of the battery collection system is performed based on the duration of the drift failure direction, including: when it is determined that the first collection component has a negative drift failure, the negative duration of the negative drift failure is obtained; if the negative duration is greater than or equal to a preset time threshold Timeth, it is considered that the first collection component has failed in the negative drift failure direction, and the battery collection system is determined to be faulty.

[0062] In some embodiments, obtaining the forward duration of the forward drift failure includes: obtaining a first drift count value and a first sampling period of a first acquisition component; determining the product of the first drift count value and the first sampling period, and using the product as the forward duration.

[0063] In an embodiment, when it is determined that the first acquisition component has failed in the forward drift, the first drift count value Cnt1 and the first sampling period T1 corresponding to the first acquisition component are obtained, and the product of the first drift count value Cnt1 and the first sampling period T1 is calculated, and the product is used as the forward duration, i.e., Cnt1×T1; if the forward duration is greater than or equal to the preset time threshold Timeth, i.e., Cnt1×T1≥Timeth, it is considered that the first acquisition component has failed in the forward drift failure direction, and the battery acquisition system is determined to be faulty.

[0064] In some embodiments, obtaining the negative duration of the negative drift failure includes: obtaining a second drift count value and a second sampling period of a second acquisition component; determining the product of the second drift count value and the second sampling period, and using the product as the negative duration.

[0065] In an embodiment, when it is determined that the first acquisition component has failed in the negative drift, the second drift count value Cnt2 corresponding to the second acquisition component is obtained, and the product of the second drift count value Cnt2 and the second sampling period T2 is calculated, and the product is used as the negative duration, i.e., Cnt2×T2; if the negative duration is greater than or equal to the preset time threshold Timeth, i.e., Cnt2×T2≥Timeth, it is considered that the first acquisition component has failed in the negative drift failure direction, and the battery acquisition system is determined to be faulty.

[0066] The first drift count value Cnt1 and the second drift count value Cnt2 are determined by a counter used to determine whether the drift count value lasts for a certain period of time. In software execution, the determination condition is generally called by a timed task cycle.

[0067] In some embodiments, fault diagnosis of a battery acquisition system is performed based on the duration of a drift failure direction, further comprising: obtaining an effective proportion coefficient; determining the product of the effective proportion coefficient and a preset time threshold, and determining the effective time threshold based on the product; when the positive duration is greater than or equal to the effective time threshold, determining the accumulated first drift count value of the first acquisition component; and when the positive duration is less than the effective time threshold, clearing the first drift count value of the first acquisition component.

[0068] In an embodiment, when the duration of the drift failure direction does not reach a preset time threshold, the effective proportion coefficient η% is obtained. The effective proportion coefficient η% can be fixed or calibrated, and is a preset amount that can be modified to determine whether to clear the drift count value; the product of the effective proportion coefficient η% and the preset time threshold Timeth is calculated, and the product is determined as the effective time threshold, i.e., η%×Timeth.

[0069] When the positive duration of the positive drift failure is greater than or equal to the effective time threshold, that is, Cnt1×T1≥η%×Timeth, it is considered that the first acquisition component is determined to have failed in the positive drift failure direction. At this time, the current first drift count value Cnt1 is retained. When the current first drift count value Cnt1 is greater than 0, the number of times that the preset sampling threshold offset is not met is subtracted from it, that is, Cnt1-1; or when the current first drift count value Cnt1 is less than or equal to 0, Cnt1=0 is set, and the changed first drift count value is determined as the cumulative first drift count value.

[0070] When the forward duration is less than the effective time threshold, that is, Cnt1×T1<η%×Timeth, it is considered that the first acquisition component has not failed in the forward drift failure direction. It may be caused by high-frequency interference conditions that lead to inconsistent sampling values ​​of heterogeneous sensors. At this time, the current first drift count value Cnt1 of the first acquisition component is cleared.

[0071] In some embodiments, after determining the effective time threshold, it also includes: when the negative duration is greater than or equal to the effective time threshold, determining the accumulated second drift count value of the second acquisition component; when the negative duration is less than the effective time threshold, clearing the second drift count value of the second acquisition component.

[0072] In the embodiment, after determining the effective time threshold, i.e., η%×Timeth, when the negative duration of the negative drift failure is greater than or equal to the effective time threshold, i.e., Cnt2×T2≥η%×Timeth, it is considered that the first acquisition component is determined to have failed in the negative drift failure direction, and at this time, the current second drift count value Cnt2 of the second acquisition component is retained. When the current second drift count value Cnt2 is greater than 0, the number of times that the preset sampling threshold offset is not met is subtracted from this value, i.e., Cnt2-1; or when the current second drift count value Cnt2 is less than or equal to 0, Cnt2=0 is set, and the changed second drift count value is determined as the accumulated second drift count value.

[0073] When the negative duration is less than the effective time threshold, that is, Cnt2×T2<η%×Timeth, it is considered that the first acquisition component has not failed in the negative drift failure direction. It may be caused by high-frequency interference conditions that lead to inconsistent sampling values ​​of heterogeneous sensors. At this time, the current second drift count value Cnt2 of the second acquisition component is cleared.

[0074] Reference below Figure 6 The fault diagnosis method of the battery collection system according to the embodiment of the present invention is described by way of example.

[0075] like Figure 6As shown, the fault diagnosis method of the battery collection system according to the embodiment of the present invention at least includes steps S11 to S28.

[0076] Step S11, the first acquisition component acquires a first performance parameter; the second acquisition component acquires a second performance parameter.

[0077] Step S12: determining a difference between the first performance parameter and the second performance parameter.

[0078] Step S13, determining whether the difference is greater than or equal to a preset sampling threshold, if so, executing step S14; otherwise, executing step S18.

[0079] Step S14, determining that the first acquisition component has a positive drift failure.

[0080] Step S15, obtaining a first drift count value and a first sampling period of the first acquisition component; determining the product of the first drift count value and the first sampling period, and using the product as the forward duration.

[0081] Step S16, determine whether the forward duration is greater than or equal to a preset time threshold, if so, execute step S17; otherwise, execute step S22.

[0082] Step S17, determining that the first acquisition component fails, and controlling the battery acquisition system to enter a preset mode.

[0083] Step S18, determining that the first acquisition component has negative drift failure.

[0084] Step S19, obtaining a second drift count value and a second sampling period of the second acquisition component; determining the product of the second drift count value and the second sampling period, and using the product as the negative duration.

[0085] Step S20, determining whether the negative duration is greater than or equal to a preset time threshold, if so, executing step S21; otherwise, executing step S22.

[0086] Step S21, determining that the first acquisition component fails, and controlling the battery acquisition system to enter a preset mode.

[0087] Step S22, obtaining an effective proportion coefficient; determining the product of the effective proportion coefficient and a preset time threshold, and determining the effective time threshold according to the product.

[0088] Step S23, determine whether the forward duration is greater than or equal to the effective time threshold, if so, execute step S24; otherwise, execute step S25.

[0089] Step S24, determining the accumulated first drift count value of the first acquisition component.

[0090] Step S25, clearing the first drift count value of the first acquisition component.

[0091] Step S26, determine whether the negative duration is greater than or equal to the effective time threshold, if so, execute step S27; otherwise, execute step S28.

[0092] Step S27, determining the accumulated second drift count value of the second acquisition component.

[0093] Step S28, clearing the second drift count value of the second acquisition component.

[0094] According to the fault diagnosis method of the battery acquisition system of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0095] Reference below Figure 7 A fault diagnosis device 2 of a battery data collection system according to an embodiment of the present invention is described.

[0096] like Figure 7 As shown, the fault diagnosis device 2 of the battery acquisition system of the embodiment of the present invention includes: an acquisition module 21, a determination module 22 and a judgment module 23, wherein:

[0097] The acquisition module 21 is used to acquire the first performance parameter and the second performance parameter of the battery; the determination module 22 is used to determine the drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and the preset sampling threshold; the judgment module 23 is used to perform fault diagnosis on the battery acquisition system according to the duration of the drift failure direction.

[0098] In the embodiment, the acquisition module 21 uses different heterogeneous acquisition components to respectively acquire the performance parameters of the battery, wherein the acquisition module 21 includes a first acquisition component and a second acquisition component, the first acquisition component and the second acquisition component are acquisition components of different types or using different technologies, and have different principles and methods in data acquisition, processing and transmission. The first performance parameter is acquired in real time through the first acquisition component, and the second performance parameter is acquired in real time through the second acquisition component. The above performance parameters include but are not limited to the current, voltage, temperature and other parameters of the battery. The performance parameters of the battery are acquired in real time through the heterogeneous acquisition components to provide data support for the subsequent judgment of whether the battery acquisition system is faulty. Among them, the performance parameters of the battery are parameters related to the normal operation of the battery. By acquiring the performance parameters of the battery, the current sampling state of the battery is determined.

[0099] After the determination module 22 obtains the first performance parameter and the second performance parameter, it calculates the difference between the first performance parameter and the second performance parameter, and compares the difference with a preset sampling threshold, determines whether a drift failure occurs in the battery acquisition system according to different comparison results, and when a drift failure occurs in the battery acquisition system, determines the corresponding drift failure direction, including positive drift failure and negative drift failure. Compared with the existing method of comparing the absolute value of the difference with a preset sampling threshold, it can distinguish the direction of the drift failure of the battery acquisition system, thereby timely identifying whether the unique direction drift of the battery acquisition system is faulty.

[0100] After the judgment module 23 determines the drift failure direction of the battery acquisition system, the duration of the drift failure direction is obtained. If the duration of the drift failure direction reaches the preset time threshold, it is considered that the battery acquisition system is determined to have failed in the corresponding drift failure direction, and the battery acquisition system is determined to have failed, and the battery acquisition system is controlled to enter a preset mode such as a safe mode; conversely, if the duration of the drift failure direction does not reach the preset time threshold, it is considered that the battery has not failed in the corresponding drift failure direction, and it may be that the high-frequency interference condition has an adverse effect on the battery acquisition system, and it is determined that the battery acquisition system has not failed, so as to reduce the misjudgment and missed judgment of the battery acquisition system failure in the operating scenario with high-frequency interference injection.

[0101] According to the fault diagnosis device 2 of the battery acquisition system of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0102] Reference below Figure 8 The electric device 3 according to the embodiment of the present invention is described.

[0103] like Figure 8 As shown, the electric equipment 3 of the embodiment of the present invention includes the fault diagnosis device 2 of the battery collection system of the above embodiment.

[0104] According to the electric device 3 of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of the drift failure of the battery acquisition system, it is timely identified whether the unique direction drift of the battery acquisition system is faulty. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0105] The following describes a computer-readable storage medium according to an embodiment of the present invention.

[0106] The computer-readable storage medium of the embodiment of the present invention stores a fault diagnosis program for the battery acquisition system. When the fault diagnosis program for the battery acquisition system is executed by the processor, the fault diagnosis method for the battery acquisition system implemented above is implemented.

[0107] The following describes a computer program product according to an embodiment of the present invention.

[0108] The computer program product of the embodiment of the present invention includes a computer program. When the computer program is executed by a processor, the fault diagnosis method of the battery acquisition system of the above embodiment is implemented.

[0109] According to the computer program product of the embodiment of the present invention, by obtaining the first performance parameter and the second performance parameter of the battery, the drift failure direction of the battery acquisition system is determined according to the size relationship between the difference between the first performance parameter and the second performance parameter and the preset sampling threshold, and the duration corresponding to different drift failure directions is obtained, so as to perform fault diagnosis on the battery acquisition system according to the duration. In an operation scenario without high-frequency interference injection, by distinguishing the direction of drift failure of the battery acquisition system, whether the drift in the only direction of the battery acquisition system is faulty is timely identified. In an operation scenario with high-frequency interference injection, by determining the duration of the drift failure direction, the situation of misjudgment and missed judgment of battery acquisition system failure is reduced.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0111] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fault diagnosis method for a battery collection system, characterized in that: include: Acquire a first performance parameter and a second performance parameter of the battery; Determining a drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold; Fault diagnosis is performed on the battery acquisition system according to the duration of the drift failure direction.

2. The fault diagnosis method of the battery collection system according to claim 1, characterized in that: The battery acquisition system includes a first acquisition component and a second acquisition component, and acquires the first performance parameter and the second performance parameter of the battery, including: The first acquisition component acquires the first performance parameter; The second acquisition component obtains the second performance parameter.

3. The fault diagnosis method of the battery collection system according to claim 2, characterized in that: Determining the drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold includes: determining a difference between the first performance parameter and the second performance parameter; When the difference is greater than or equal to the preset sampling threshold, it is determined that the first acquisition component has a positive drift failure; When the difference is smaller than the preset sampling threshold, it is determined that the first acquisition component has negative drift failure.

4. The fault diagnosis method of the battery collection system according to claim 3, characterized in that: Performing fault diagnosis on the battery acquisition system according to the duration of the drift failure direction includes: When it is determined that the first acquisition component has a forward drift failure, obtaining a forward duration of the forward drift failure; If the forward duration is greater than or equal to the preset time threshold, it is determined that the first acquisition component is faulty.

5. The fault diagnosis method of the battery collection system according to claim 3, characterized in that: Performing fault diagnosis on the battery acquisition system according to the duration of the drift failure direction includes: When it is determined that the first acquisition component has a negative drift failure, obtaining a negative duration of the negative drift failure; If the negative duration is greater than or equal to the preset time threshold, it is determined that the first acquisition component is faulty.

6. The fault diagnosis method of the battery collection system according to claim 4, characterized in that: Get the forward duration of the forward drift failure, including: Acquire a first drift count value and a first sampling period of the first acquisition component; A product of the first drift count value and the first sampling period is determined, and the product is used as the forward duration.

7. The fault diagnosis method of the battery collection system according to claim 5, characterized in that: Get the negative duration of negative drift failure, including: Acquire a second drift count value and a second sampling period of the second acquisition component; A product of the second drift count value and the second sampling period is determined, and the product is used as the negative duration.

8. The fault diagnosis method of the battery collection system according to claim 3, characterized in that: Performing fault diagnosis on the battery acquisition system according to the duration of the drift failure direction also includes: Get the effective proportion coefficient; Determine the product of the effective proportion coefficient and the preset time threshold, and determine the effective time threshold according to the product; When the positive continuous time is greater than or equal to the effective time threshold, determining the accumulated first drift count value of the first acquisition component; When the forward duration is less than the effective time threshold, the first drift count value of the first acquisition component is cleared.

9. The fault diagnosis method of the battery collection system according to claim 8, characterized in that: After determining the effective time threshold, it also includes: When the negative continuous time is greater than or equal to the effective time threshold, determining the accumulated second drift count value of the second acquisition component; When the negative duration is less than the effective time threshold, the second drift count value of the second acquisition component is cleared.

10. The fault diagnosis method of the battery collection system according to claim 4 or 5, characterized in that: After determining that the first acquisition component fails, the method includes: Control the battery collection system to enter a preset mode.

11. A fault diagnosis device for a battery collection system, characterized in that: include: An acquisition module, used to acquire a first performance parameter and a second performance parameter of the battery; A determination module, configured to determine a drift failure direction of the battery acquisition system according to the first performance parameter, the second performance parameter and a preset sampling threshold; A judgment module is used to perform fault diagnosis on the battery acquisition system according to the duration of the drift failure direction.

12. An electrical device, characterized in that: include: The fault diagnosis device of the battery collection system as claimed in claim 11.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a fault diagnosis program for a battery acquisition system, and when the fault diagnosis program for a battery acquisition system is executed by a processor, the fault diagnosis method for a battery acquisition system according to any one of claims 1 to 10 is implemented.

14. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the fault diagnosis method of the battery collection system according to any one of claims 1 to 10 is implemented.

Images