Method for diagnosing a fault
By comparing the voltage relationship between the power module and the battery, the problem of inaccurate diagnosis caused by sensor failure in relay fault diagnosis is solved. It enables accurate judgment of relay faults without adding sensors, reducing costs and improving accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2022-01-18
- Publication Date
- 2026-06-02
Smart Images
Figure CN116500483B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of batteries, specifically to a fault diagnosis method. Background Technology
[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.
[0003] During battery use, relays often fail. In existing relay fault diagnosis circuits, the relay's sensors and signal transceivers frequently malfunction, affecting the diagnostic results of relay faults. Summary of the Invention
[0004] In view of the above problems, this application provides a fault diagnosis method that can effectively solve the problem of relay diagnostic results being incorrect due to sensor failure during battery use.
[0005] The first aspect of this application provides a fault diagnosis method for diagnosing relay faults through a relay connection circuit. The relay connection circuit includes: a relay, a power module, and a battery; the relay is connected to the power module, the relay is connected to the battery, and the power module is connected to the battery; the relay controls the power module to be in a first connection state or a second connection state; the power module outputs a constant current to the battery; the fault diagnosis method includes: acquiring the voltage of the power module; acquiring the voltage of the battery; and determining whether the relay has failed based on the voltage of the power module and the voltage of the battery.
[0006] In the embodiments of this application, the voltage of the power module and the voltage of the battery are obtained, and the voltage of the power module and the voltage of the battery are compared to determine whether the relay has failed. This allows for relay fault diagnosis without adding additional sensor devices to the relay.
[0007] In some possible embodiments, the relay includes a first relay, a second relay, and a third relay; the power module includes a first power module and a second power module; a first terminal of the first power module is connected to a first terminal of the battery; a second terminal of the second power module is connected to a second terminal of the battery; a first terminal of the first relay is connected to a first terminal of the first power module, and a second terminal of the first relay is connected to a first terminal of the second power module; a first terminal of the second relay is connected to a second terminal of the first power module, and a second terminal of the second relay is connected to a second terminal of the second power module; a first terminal of the third relay is connected to a second terminal of the first power module, and a second terminal of the third relay is connected to a first terminal of the second power module; acquiring the voltage of the power module includes acquiring a first voltage and acquiring a second voltage, wherein the first voltage includes the voltage of the first power module, and the second voltage includes the voltage of the second power module; acquiring the voltage of the battery includes acquiring a third voltage, wherein the third voltage includes the voltage of the battery; and determining whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage.
[0008] In the embodiments of this application, the voltage of the first power module, the voltage of the second power module, and the voltage of the battery are obtained to determine whether the relay has malfunctioned.
[0009] In some possible embodiments, before acquiring the voltage of the power module, the method further includes: controlling the first relay to be in an open state, controlling the second relay to be in an open state, and controlling the third relay to be in a closed state, so that the first power module and the second power module are in a first connected state, the first connected state including a series connection; determining whether the relay has failed based on the first voltage, the second voltage, or the third voltage includes: determining whether the first relay has failed based on the first voltage and the third voltage; determining whether the second relay has failed based on the second voltage and the third voltage; and determining whether the third relay has failed based on the first voltage, the second voltage, and the third voltage.
[0010] In the embodiments of this application, by controlling the first power module and the second power module to be in a series connection, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0011] In some possible embodiments, before acquiring the voltage of the power module, the method further includes: controlling the first relay to be in a closed state, controlling the second relay to be in a closed state, and controlling the third relay to be in an open state, so that the first power module and the second power module are in a second connection state, the second connection state including a parallel connection state; determining whether the relay has failed based on the first voltage, the second voltage, or the third voltage includes: determining whether the first relay has failed based on the first voltage and the third voltage; determining whether the second relay has failed based on the second voltage and the third voltage; and determining whether the third relay has failed based on the first voltage, the second voltage, and the third voltage.
[0012] In the embodiments of this application, by controlling the first power module and the second power module to be in parallel, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0013] In some possible embodiments, determining whether the relay has failed based on the first voltage, the second voltage, or the third voltage further includes: determining that the first relay has not failed when the first voltage satisfies a first waveform; determining that the first relay has failed when the first voltage is close to the magnitude of the third voltage; determining that the second relay has not failed when the second voltage satisfies the first waveform; determining that the second relay has failed when the second voltage is close to the magnitude of the third voltage; and determining that the third relay has failed when the sum of the first voltage and the second voltage does not satisfy the third voltage.
[0014] In the embodiments of this application, by controlling the first power module and the second power module to be in a series connection, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0015] In some possible embodiments, determining whether the relay has failed based on the first voltage, the second voltage, or the third voltage further includes: determining that the first relay has failed if the first voltage does not meet the third voltage; determining that the second relay has failed if the second voltage does not meet the third voltage; determining that the third relay has not failed if the first voltage and the second voltage satisfy a second waveform; and determining that the third relay has failed if the sum of the first voltage and the second voltage satisfies the third voltage.
[0016] In the embodiments of this application, by controlling the first power module and the second power module to be in parallel, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0017] A second aspect of this application provides a fault diagnosis device for diagnosing relay faults via a relay connection circuit. The relay connection circuit includes: a relay, a power module, and a battery. The relay includes a first relay, a second relay, and a third relay. The power module includes a first power module and a second power module. A first terminal of the first power module is connected to a first terminal of the battery. A second terminal of the second power module is connected to a second terminal of the battery. A first terminal of the first relay is connected to a first terminal of the first power module, and a second terminal of the first relay is connected to a first terminal of the second power module. A first terminal of the second relay is connected to a second terminal of the first power module, and a second terminal of the second relay is connected to a second terminal of the second power module. A first terminal of the third relay is connected to a second terminal of the first power module, and a second terminal of the third relay is connected to a first terminal of the second power module. The fault diagnosis device includes: an acquisition module and a processing module. The acquisition module is used to acquire the voltage of the power module and the voltage of the battery. The processing module is used to determine whether a relay has malfunctioned based on the voltage of the power module and the voltage of the battery.
[0018] In the embodiments of this application, the acquisition module acquires the voltage of the power module and the voltage of the battery, and the processing module determines whether the relay has failed by comparing the voltage of the power module and the voltage of the battery. This allows for fault diagnosis of the relay without adding an additional sensor device to the relay.
[0019] In some possible embodiments, the acquisition module is used to acquire a first voltage, a second voltage, and a third voltage, wherein the first voltage includes the voltage of the first power module, the second voltage includes the voltage of the second power module, and the third voltage includes the voltage of the battery; the processing module is used to determine whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage.
[0020] In the embodiments of this application, the processing module determines whether the relay has malfunctioned by acquiring the voltage of the first power module, the voltage of the second power module, and the voltage of the battery.
[0021] In some possible embodiments, before the processing module acquires the voltage of the power module, the processing module controls the first relay to be in an open state, controls the second relay to be in an open state, and controls the third relay to be in a closed state, so that the first power module and the second power module are in a first connected state, the first connected state including a series connection state; the processing module is further configured to determine whether the relay has failed based on the first voltage, the second voltage, or the third voltage, including: the processing module determines that the first relay has not failed when the first voltage meets a first waveform; determines that the first relay has failed when the first voltage is close to the magnitude of the third voltage; determines that the second relay has not failed when the second voltage meets the first waveform; determines that the second relay has failed when the second voltage is close to the magnitude of the third voltage; and determines that the relay has failed when the sum of the first voltage and the second voltage does not meet the third voltage.
[0022] In the embodiments of this application, the processing module determines whether a relay has malfunctioned by controlling the first power module and the second power module to be in a series connection state, based on the voltage change relationship between the first power module, the second power module and the battery, and can accurately determine the fault status of each relay.
[0023] In some possible embodiments, before the processing module acquires the voltage of the power module, the processing module controls the first relay to be in a closed state, controls the second relay to be in a closed state, and controls the third relay to be in an open state, so that the first power module and the second power module are in a second connection state, the second connection state including a parallel connection state; the processing module is further configured to determine whether the relay has failed based on the first voltage, the second voltage, or the third voltage, including: the processing module determines that the first relay has failed if the first voltage does not meet the third voltage; determines that the second relay has failed if the second voltage does not meet the third voltage; determines that the third relay has not failed if the first voltage and the second voltage meet a second waveform; and determines that the third relay has failed if the sum of the first voltage and the second voltage meets the third voltage.
[0024] In the embodiments of this application, the processing module determines whether a relay has malfunctioned by controlling the first power module and the second power module to be in parallel state, based on the voltage change relationship between the first power module, the second power module and the battery, and can accurately determine the fault status of each relay.
[0025] A third aspect of this application provides a fault diagnosis apparatus, including a memory and a processor, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute the methods of the first aspect and any possible implementation thereof based on the instructions.
[0026] A fourth aspect of this application provides a readable storage medium for storing a computer program for performing the methods of the first aspect and any possible implementation thereof.
[0027] The fifth aspect of this application also provides an electric vehicle, which may include one or more of the fault diagnosis devices provided above in this application. Attached Figure Description
[0028] Figure 1 Schematic diagram of relay connection circuit provided for some embodiments of this application
[0029] Figure 2 This is a schematic flowchart of a fault diagnosis method disclosed in an embodiment of this application.
[0030] Figure 3 This is a circuit connection diagram of the fault diagnosis method disclosed in the embodiments of this application.
[0031] Figure 4 The waveform diagram of the first waveform
[0032] Figure 5 The waveform diagram of the second waveform is shown.
[0033] Figure 6 This is a schematic block diagram of a fault diagnosis device disclosed in another embodiment of this application. Detailed Implementation
[0034] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings, are intended to cover non-exclusive inclusion.
[0036] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. They can also refer to a mechanical connection or a connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0042] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.
[0043] The inventors have noted that relays are widely used in power batteries, but a relay malfunction can lead to a serious battery accident. Therefore, timely detection of relay malfunctions is a pressing issue. Existing technologies typically use sensors in the relay connection circuit to detect relay malfunctions. However, if the sensor also malfunctions, timely and effective detection of the relay becomes impossible. Furthermore, using too many sensors can increase material costs.
[0044] Based on the above considerations, in order to solve the problem of effective relay fault detection, the inventors, through in-depth research, designed a fault diagnosis method that determines whether a relay has malfunctioned based on changes in the power module and battery voltage values. This method can achieve fault diagnosis of relays in series and parallel configurations without adding additional sensor devices.
[0045] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and batteries disclosed in this application. This helps to mitigate and automatically regulate the deterioration of cell expansion force, replenish electrolyte consumption, and improve the stability of battery performance and battery life.
[0046] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0047] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a relay connection circuit provided for some embodiments of this application. The circuit includes a relay, a power module, and a battery.
[0048] A relay is an electronic control device that functions in a circuit, providing automatic adjustment, safety protection, and circuit switching. Relays used in new energy vehicles may include high-voltage DC relays, but this embodiment is not limited to this. Relay failure modes may include relay sticking, non-conductivity, burnout, explosion, and installation failure, but this embodiment is not limited to these either.
[0049] The power module is used to regulate the current and voltage during battery charging and discharging, thereby controlling the power during the battery charging and discharging process.
[0050] The first connection state refers to the state in which the first power module and the second power module are connected in series. The first relay K1 is in the open state, the second relay K2 is in the open state, and the third relay K3 is in the closed state, so that the first power module and the second power module are connected in series.
[0051] The second connection state refers to the state in which the first power module and the second power module are connected in parallel. The first relay K1 is in the closed state, the second relay K2 is in the closed state, and the third relay K3 is in the open state, so that the first power module and the second power module are connected in parallel.
[0052] Figure 2 This is a schematic flowchart of a fault diagnosis method disclosed in an embodiment of this application.
[0053] Step 201: Obtain the voltage of the power module.
[0054] Obtaining the voltage of the power module may include acquiring the real-time voltage, average voltage, and maximum voltage of the power module, and this embodiment is not limited in this regard. It may also include acquiring the voltage waveform of the power module, and this embodiment is not limited in this regard. The voltage of the power module can be obtained by acquiring the voltage of the capacitor connected in parallel with the power module, and this embodiment is not limited in the specific method of acquisition.
[0055] Step 202: Obtain the battery voltage.
[0056] Obtaining the battery voltage can include acquiring the battery's real-time voltage, average voltage, and maximum voltage, etc., and this embodiment is not limited in this regard. It can also include acquiring the battery's voltage waveform, and this embodiment is not limited in this regard. The battery voltage can be obtained by acquiring the voltage of a capacitor connected in parallel with the battery, and this embodiment is not limited in the specific acquisition method.
[0057] Step 203: Determine whether the relay has malfunctioned based on the voltage of the power module and the voltage of the battery.
[0058] Determining whether a relay has malfunctioned based on the voltage of the power module and the battery can include comparing the real-time voltage of the power module and the real-time voltage of the battery, or comparing their average voltage, maximum voltage, etc., to determine whether the relay has malfunctioned. This embodiment of the application is not limited to this method. Alternatively, it can be determined by comparing the voltage waveforms of the power module and the battery, etc., and this embodiment is not limited to this method either.
[0059] The relay connection circuit includes: a relay, a power module, and a battery. The relay is connected to the power module, and the power module is also connected to the battery. The relay is used to control the power module to be in either a first or second connection state.
[0060] In this embodiment, by acquiring the voltage of the power module and the voltage of the battery, and comparing the voltage of the power module and the voltage of the battery, it is determined whether the relay has failed. This allows for relay fault diagnosis without adding additional sensor devices to the relay.
[0061] Figure 3 This is a circuit connection diagram of the fault diagnosis method disclosed in the embodiments of this application. Steps similar to those in the foregoing embodiments can be referred to the foregoing embodiments, and for the sake of brevity, will not be repeated here.
[0062] In some embodiments of this application, optionally, the relay includes at least a first relay K1, a second relay K2, and a third relay K3. The power module includes at least a first power module and a second power module.
[0063] The relay connection circuit can be connected in the following ways: The first terminal of the first power module is connected to the first terminal of the battery. The second terminal of the second power module is connected to the second terminal of the battery. The first terminal of the first relay K1 is connected to the first terminal of the first power module, and the second terminal of the first relay K1 is connected to the first terminal of the second power module. The first terminal of the second relay K2 is connected to the second terminal of the first power module, and the second terminal of the second relay K2 is connected to the second terminal of the second power module. The first terminal of the third relay K3 is connected to the second terminal of the first power module, and the second terminal of the third relay K3 is connected to the first terminal of the second power module.
[0064] Obtaining the voltage of the power module may include at least obtaining a first voltage and obtaining a second voltage. The first voltage includes the voltage of a first power module, and the second voltage includes the voltage of a second power module. Obtaining the battery voltage includes obtaining a third voltage, which may include the battery voltage. Based on the first voltage, the second voltage, or the third voltage, it is determined whether a relay has malfunctioned.
[0065] Obtaining the first voltage refers to obtaining the voltage of the first power supply module. This may include obtaining the real-time voltage, average voltage, and maximum voltage of the first power supply module, but this embodiment is not limited to this.
[0066] This may also include acquiring the voltage waveform of the first power module, but this embodiment is not limited to this. The voltage of the first power module can be obtained by acquiring the voltage of the capacitor connected in parallel with the first power module, and the specific acquisition method is not limited in this embodiment.
[0067] Obtaining the second voltage refers to obtaining the voltage of the second power supply module. This may include obtaining the real-time voltage, average voltage, and maximum voltage of the second power supply module, but this embodiment is not limited to this.
[0068] This may also include acquiring the voltage waveform of the second power module, but this embodiment is not limited to this. The voltage of the second power module can be obtained by acquiring the voltage of a capacitor connected in parallel with the second power module, and the specific acquisition method is not limited in this embodiment.
[0069] Obtaining the third voltage refers to obtaining the voltage of the third power module. This includes obtaining the voltage value of the third power module, which may include real-time voltage, average voltage, maximum voltage, etc., and this embodiment is not limited to this. It may also include obtaining the voltage waveform of the third power module, and this embodiment is not limited to this. The voltage of the third power module can be obtained by obtaining the voltage of the capacitor connected in parallel with the third power module, and the specific method of obtaining it is not limited in this embodiment.
[0070] Determining whether a relay has malfunctioned based on a first voltage, a second voltage, or a third voltage means comparing the values of the first, second, and third voltages to determine if the relay has malfunctioned. Alternatively, it can be determined by analyzing the voltage waveforms of the first, second, and third voltages; this embodiment does not limit this approach.
[0071] In this embodiment of the application, the voltage of the first power module, the voltage of the second power module, and the voltage of the battery are used to determine whether the relay has malfunctioned.
[0072] Optionally, in some embodiments of this application, the method further includes, before obtaining the voltage of the power module:
[0073] The first relay K1 is controlled to be in the open state, the second relay K2 is controlled to be in the open state, and the third relay K3 is controlled to be in the closed state, so that the first power module and the second power module are in a first connection state, which includes a series connection state.
[0074] Determine whether a relay has malfunctioned based on a first voltage, a second voltage, or a third voltage, including: determining whether the first relay K1 has malfunctioned based on the first and third voltages; determining whether the second relay K2 has malfunctioned based on the second and third voltages; and determining whether the third relay K3 has malfunctioned based on the first, second, and third voltages.
[0075] Determining whether the first relay K1 has malfunctioned based on the first voltage and the third voltage means judging whether the first relay K1 has malfunctioned by comparing the first voltage and the third voltage. This can be done by comparing the real-time voltage of the first voltage with the real-time voltage of the third voltage, or by comparing the voltage waveform of the first voltage with the voltage waveform of the third voltage, etc., but this embodiment is not limited to this method.
[0076] Determining whether the second relay K2 has malfunctioned based on the second and third voltages means judging whether the second relay K2 has malfunctioned by comparing the second voltage and the third voltage. This can be done by comparing the real-time voltage of the second voltage with the real-time voltage of the third voltage, or by comparing the voltage waveform of the second voltage with the voltage waveform of the third voltage, etc., but this embodiment is not limited to this method.
[0077] Determining whether the third relay K3 has malfunctioned based on the first voltage, second voltage, and third voltage means comparing the first voltage, second voltage, and third voltage to determine if the third relay K3 has malfunctioned. This can be done by comparing the real-time voltages of the first, second, and third voltages, or by comparing the voltage waveforms of the first, second, and third voltages. This embodiment is not limited to these methods.
[0078] In this embodiment, by controlling the first power module and the second power module to be in a series connection, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0079] Optionally, in some embodiments of this application, the method further includes, before obtaining the voltage of the power module:
[0080] The first relay K1 is controlled to be closed, the second relay K2 is controlled to be closed, and the third relay K3 is controlled to be open, so that the first power module and the second power module are in a second connection state, which includes a parallel connection state.
[0081] Determine whether a relay has malfunctioned based on a first voltage, a second voltage, or a third voltage, including: determining whether the first relay K1 has malfunctioned based on the first and third voltages; determining whether the second relay K2 has malfunctioned based on the second and third voltages; and determining whether the third relay K3 has malfunctioned based on the first, second, and third voltages.
[0082] In this embodiment, by controlling the first power module and the second power module to be in parallel, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0083] In some embodiments of this application, optionally, when the first power module and the second power module are connected in series, determining whether a relay has failed based on a first voltage, a second voltage, or a third voltage further includes:
[0084] Figure 4The first waveform is shown below. If the first voltage matches the first waveform, the first relay K1 is determined to be functioning correctly. If the first voltage is close to the third voltage, the first relay K1 is determined to be faulty. If the second voltage matches the first waveform, the second relay K2 is determined to be functioning correctly. If the second voltage is close to the third voltage, the second relay K2 is determined to be faulty. If the sum of the first and second voltages does not meet the third voltage, the relay is determined to be faulty.
[0085] Determining that the first relay K1 is not faulty when the first voltage satisfies the first waveform means that the voltage waveform of the first power module satisfies the first waveform. Satisfying the first waveform may include the voltage waveform change shape of the first voltage being similar to the waveform shape of the first waveform, or it may include the voltage waveform of the first voltage and the first waveform having a difference of ±15V at the same time. This embodiment is not limited to these limitations.
[0086] Determining that the first relay K1 has failed when the first voltage is close to the third voltage means that the magnitude of the first voltage is approximately equal to the magnitude of the third voltage, is considered a fault assessment. This could include the real-time magnitude of the first voltage being approximately equal to the real-time magnitude of the third voltage, with the difference between them within ±15V. Alternatively, it could include the voltage waveforms of the first voltage and the third voltage being approximately identical, with the difference between the waveforms within ±15V, etc. This embodiment is not limited to these specific cases.
[0087] Determining that the second relay K2 is not faulty when the second voltage satisfies the first waveform means that the voltage waveform of the second voltage satisfies the first waveform. The second voltage waveform satisfying the first waveform may include the waveform change shape of the second voltage being similar to the waveform change shape of the first waveform. It may also include the difference between the second voltage waveform and the first waveform at the same time being within ±15V, etc., but this embodiment is not limited to this.
[0088] When the second voltage is close to the magnitude of the third voltage, a fault in the second relay K2 is determined to be when the magnitude of the second voltage is approximately equal to the magnitude of the third voltage. This can include the real-time magnitude of the second voltage being approximately equal to the real-time magnitude of the third voltage, with the difference between them within ±15V. It can also include the voltage waveforms of the second voltage and the third voltage being approximately the same, with the difference between the waveforms within ±15V, etc. This embodiment is not limited to these specific cases.
[0089] A fault in the third relay K3 is determined when the sum of the first and second voltages does not satisfy the third voltage. This means the sum of the first and second voltages is not equal to the third voltage. This could include situations where the sum of the real-time first and second voltages is not equal to the real-time third voltage. Alternatively, it could include situations where the difference between the sum of the real-time first and second voltages and the real-time third voltage is greater than 10V. This embodiment is not limited to these possibilities.
[0090] In this embodiment, by controlling the first power module and the second power module to be in a series connection, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0091] In some embodiments of this application, optionally, when the first power module and the second power module are connected in parallel, determining whether a relay has failed based on a first voltage, a second voltage, or a third voltage further includes: determining that the first relay K1 has failed if the first voltage does not meet the third voltage; determining that the second relay K2 has failed if the second voltage does not meet the third voltage; determining that the third relay K3 has not failed if the first voltage and the second voltage satisfy a second waveform; and determining that the third relay K3 has failed if the sum of the first voltage and the second voltage satisfies the third voltage.
[0092] Figure 5 The waveform diagram of the second waveform is shown. When the first voltage does not meet the third voltage requirement, a fault in the first relay K1 is determined when the difference between the magnitude of the first voltage and the magnitude of the third voltage is significant. This can include situations where the difference between the real-time first voltage and the real-time third voltage is significant, or where the difference is greater than 10V.
[0093] If the second voltage does not meet the third voltage requirement, a fault in the second relay K2 is determined when the difference between the magnitudes of the second and third voltages is significant. This can include situations where the difference between the real-time second and third voltages is significant, or where the difference exceeds 10V.
[0094] Determining that the third relay K3 is not faulty when the first voltage and the second voltage satisfy the second waveform means that the voltage waveforms of the first voltage and the second voltage satisfy the first waveform, it is judged that the third relay K3 is not faulty. The voltage waveforms of the first voltage and the second voltage satisfying the first waveform may include similarities between the waveform changes of the first voltage and the waveform changes of the second voltage. It may also include the voltage waveform difference between the first voltage and the first waveform at the same time being within ±15V, and the voltage waveform difference between the second voltage and the first waveform at the same time being within ±15V, etc., but this embodiment is not limited in this respect.
[0095] A fault in the third relay K3 is determined when the sum of the first and second voltages is substantially equal to the magnitude of the third voltage. This can include the sum of the real-time first and second voltages being substantially equal to the real-time third voltage. Alternatively, it can include a fault in the third relay K3 if the difference between the sum of the real-time first and second voltages and the real-time third voltage is greater than 15V. This embodiment is not limited to these possibilities.
[0096] In this embodiment, by controlling the first power module and the second power module to be in parallel, the fault status of each relay can be accurately determined based on the voltage change relationship between the first power module, the second power module and the battery.
[0097] Figure 6 This is a schematic block diagram of a fault diagnosis device disclosed in another embodiment of this application. In the embodiments of this application, the relay fault diagnosis device may include an acquisition module 601, a processing module 602, etc.
[0098] The relay connection circuit includes at least: a relay, a power supply module, and a battery. The relays include at least a first relay K1, a second relay K2, and a third relay K3. The power supply module includes at least a first power supply module and a second power supply module.
[0099] The relay connection circuit can be connected in the following ways: The first terminal of the first power module is connected to the first terminal of the battery. The second terminal of the second power module is connected to the second terminal of the battery. The first terminal of the first relay K1 is connected to the first terminal of the first power module, and the second terminal of the first relay K1 is connected to the first terminal of the second power module. The first terminal of the second relay K2 is connected to the second terminal of the first power module, and the second terminal of the second relay K2 is connected to the second terminal of the second power module. The first terminal of the third relay K3 is connected to the second terminal of the first power module, and the second terminal of the third relay K3 is connected to the first terminal of the second power module.
[0100] The acquisition module 601 is used to acquire at least the voltage of the power module and the voltage of the battery. The processing module 602 is used to determine whether the relay has malfunctioned based on the voltage of the power module and the voltage of the battery.
[0101] In this embodiment, the acquisition module 601 acquires the voltage of the power module and the voltage of the battery, and the processing module 602 determines whether the relay has failed by comparing the voltage of the power module and the voltage of the battery. This allows for fault diagnosis of the relay without adding an additional sensor device to the relay.
[0102] In some embodiments of this application, optionally, the acquisition module 601 is used to acquire a first voltage, a second voltage, and a third voltage, wherein the first voltage includes the voltage of the first power module, the second voltage includes the voltage of the second power module, and the third voltage includes the battery voltage. The processing module 602 is used to determine whether the relay has failed based on the first voltage, the second voltage, or the third voltage.
[0103] In this embodiment of the application, the processing module 602 determines whether the relay has malfunctioned by acquiring the voltage of the first power module, the voltage of the second power module, and the voltage of the battery acquired by the acquisition module 601.
[0104] In some embodiments of this application, optionally, before the processing module 602 obtains the voltage of the power module, the processing module 602 controls the first relay K1 to be in an open state, controls the second relay K2 to be in an open state, and controls the third relay K3 to be in a closed state, so that the first power module and the second power module are in a first connection state, the first connection state including a series connection state.
[0105] The processing module 602 is further configured to determine whether a relay has malfunctioned based on a first voltage, a second voltage, or a third voltage. Specifically, the processing module 602 may: determine that the first relay K1 is not malfunctioning if the first voltage meets the first waveform; determine that the first relay K1 has malfunctioned if the first voltage is close to the magnitude of the third voltage; determine that the second relay K2 is not malfunctioning if the second voltage meets the first waveform; determine that the second relay K2 has malfunctioned if the second voltage is close to the magnitude of the third voltage; and determine that the relay has malfunctioned if the sum of the first voltage and the second voltage does not meet the magnitude of the third voltage.
[0106] In this embodiment of the application, the processing module 602 determines whether a relay has malfunctioned by controlling the first power module and the second power module to be in a series connection state, based on the voltage change relationship between the first power module, the second power module and the battery, and can accurately determine the fault status of each relay.
[0107] In some embodiments of this application, optionally, before the processing module 602 obtains the voltage of the power module, the processing module 602 controls the first relay K1 to be in a closed state, controls the second relay K2 to be in a closed state, and controls the third relay K3 to be in an open state, so that the first power module and the second power module are in a second connection state, the second connection state including a parallel state.
[0108] The processing module 602 is further configured to determine whether a relay has malfunctioned based on a first voltage, a second voltage, or a third voltage. Specifically, the processing module 602 may determine that the first relay K1 has malfunctioned if the first voltage does not meet the third voltage; determine that the second relay K2 has malfunctioned if the second voltage does not meet the third voltage; determine that the third relay K3 has not malfunctioned if the first voltage and the second voltage satisfy a second waveform; and determine that the third relay K3 has malfunctioned if the sum of the first voltage and the second voltage satisfies the third voltage.
[0109] In this embodiment of the application, the processing module 602 determines whether a relay has malfunctioned by controlling the first power module and the second power module to be in parallel state, based on the voltage change relationship between the first power module, the second power module and the battery, and can accurately determine the fault status of each relay.
[0110] This disclosure also provides a computer-readable storage medium for storing a computer program for performing the methods of the various embodiments of this application described above.
[0111] This disclosure also provides a fault diagnosis device, including a memory and a processor. The memory stores computer-executable instructions. The processor is connected to the memory and is configured to implement the methods of the various embodiments described above by executing the computer-executable instructions.
[0112] This disclosure also provides an electric vehicle, which may include one or more of the fault diagnosis devices provided in one or more embodiments of this application.
[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A fault diagnosis method for diagnosing relay faults through a relay connection circuit, characterized in that, The relay connection circuit includes: a relay, a power module, and a battery; The relay is connected to the power module, the relay is connected to the battery, and the power module is connected to the battery. The relay includes a first relay, a second relay, and a third relay. The power module includes a first power module and a second power module. A first terminal of the first power module is connected to a first terminal of the battery. A second terminal of the second power module is connected to a second terminal of the battery. A first terminal of the first relay is connected to a first terminal of the first power module, and a second terminal of the first relay is connected to a first terminal of the second power module. A first terminal of the second relay is connected to a second terminal of the first power module, and a second terminal of the second relay is connected to a second terminal of the second power module. A first terminal of the third relay is connected to a second terminal of the first power module, and a second terminal of the third relay is connected to a first terminal of the second power module. The relay is used to control the power module to be in a first connection state or a second connection state; The power module is used to control the external power supply to input a constant current to the battery; The fault diagnosis method includes: Obtaining the voltage of the power module includes obtaining a first voltage and obtaining a second voltage, wherein the first voltage includes the voltage of the first power module and the second voltage includes the voltage of the second power module; Obtaining the voltage of the battery includes obtaining a third voltage, wherein the third voltage includes the voltage of the battery; The relay is determined to be faulty based on the first voltage, the second voltage, or the third voltage.
2. The method of claim 1, wherein, Before obtaining the voltage of the power module, the method further includes: The first relay is controlled to be in the off state, the second relay is controlled to be in the off state, and the third relay is controlled to be in the closed state, so that the first power module and the second power module are in the first connection state, the first connection state including the series connection state; Determining whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage includes: Based on the first voltage and the third voltage, determine whether the first relay has malfunctioned; Based on the second voltage and the third voltage, determine whether the second relay has malfunctioned; Based on the first voltage, the second voltage, and the third voltage, determine whether the third relay has malfunctioned.
3. The method of claim 1, wherein, Before obtaining the voltage of the power module, the method further includes: The first relay is controlled to be in a closed state, the second relay is controlled to be in a closed state, and the third relay is controlled to be in a closed state, so that the first power module and the second power module are in a second connection state, the second connection state including a parallel connection state; Determining whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage includes: Based on the first voltage and the third voltage, determine whether the first relay has malfunctioned; Based on the second voltage and the third voltage, determine whether the second relay has malfunctioned; Based on the first voltage, the second voltage, and the third voltage, determine whether the third relay has malfunctioned.
4. The method of claim 2, wherein, The step of determining whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage further includes: determining that the first relay has not malfunctioned if the first voltage satisfies the first waveform. If the first voltage is close to the magnitude of the third voltage, it is determined that the first relay has malfunctioned; If the second voltage satisfies the first waveform, it is determined that the second relay has not malfunctioned; If the second voltage is close to the magnitude of the third voltage, it is determined that the second relay has malfunctioned; If the sum of the first voltage and the second voltage does not meet the third voltage, it is determined that the third relay has failed.
5. The method according to claim 3, characterized in that, The step of determining whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage further includes: If the first voltage does not meet the third voltage, it is determined that the first relay has failed; If the second voltage does not meet the third voltage, it is determined that the second relay has failed; If the first voltage and the second voltage satisfy the second waveform, it is determined that the third relay has not malfunctioned; If the sum of the first voltage and the second voltage satisfies the third voltage, it is determined that the third relay has failed.
6. A fault diagnosis device for diagnosing relay faults via a relay connection circuit, characterized in that, The relay connection circuit includes: a relay, a power module, and a battery; The relay includes a first relay, a second relay, and a third relay; The power module includes a first power module and a second power module; The first terminal of the first power module is connected to the first terminal of the battery; The second terminal of the second power module is connected to the second terminal of the battery; The first terminal of the first relay is connected to the first terminal of the first power module, and the second terminal of the first relay is connected to the first terminal of the second power module; the first terminal of the second relay is connected to the second terminal of the first power module, and the second terminal of the second relay is connected to the second terminal of the second power module. The first terminal of the third relay is connected to the second terminal of the first power module, and the second terminal of the third relay is connected to the first terminal of the second power module. The relay is used to control the power module to be in a first connection state or a second connection state; the power module is used to control the external power supply to input a constant current to the battery; The fault diagnosis device includes: an acquisition module and a processing module; The acquisition module is used to acquire the voltage of the power module and the voltage of the battery; The processing module is used to determine whether the relay has malfunctioned based on the voltage of the power module and the voltage of the battery. The acquisition module is used to acquire a first voltage, a second voltage, and a third voltage, wherein the first voltage includes the voltage of the first power module, the second voltage includes the voltage of the second power module, and the third voltage includes the voltage of the battery. The processing module is used to determine whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage.
7. The apparatus according to claim 6, characterized in that, Before the processing module acquires the voltage of the power module, the processing module controls the first relay to be in an open state, controls the second relay to be in an open state, and controls the third relay to be in a closed state, so that the first power module and the second power module are in the first connection state, which includes a series connection state. The processing module is further configured to determine whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage, including: The processing module is used to determine that the first relay has not malfunctioned if the first voltage meets the first waveform. If the first voltage is close to the magnitude of the third voltage, it is determined that the first relay has malfunctioned; If the second voltage satisfies the first waveform, it is determined that the second relay has not malfunctioned; If the second voltage is close to the magnitude of the third voltage, it is determined that the second relay has malfunctioned; If the sum of the first voltage and the second voltage does not meet the third voltage, the relay is determined to be faulty.
8. The apparatus according to claim 6, characterized in that, Before the processing module acquires the voltage of the power module, the processing module controls the first relay to be in a closed state, controls the second relay to be in a closed state, and controls the third relay to be in an open state, so that the first power module and the second power module are in a second connection state, which includes a parallel connection state; The processing module is further configured to determine whether the relay has malfunctioned based on the first voltage, the second voltage, or the third voltage, including: The processing module is used to determine that the first relay has failed when the first voltage does not meet the third voltage. If the second voltage does not meet the third voltage, it is determined that the second relay has failed; If the first voltage and the second voltage satisfy the second waveform, it is determined that the third relay is not faulty; if the sum of the first voltage and the second voltage satisfies the third voltage, it is determined that the third relay is faulty.
9. A fault diagnosis device, characterized in that, include: Memory, which stores computer-executable instructions; A processor, connected to the memory, is configured to implement the fault diagnosis method according to any one of claims 1 to 5 by executing the computer-executable instructions.