A method, apparatus, device, and storage medium for diagnosing loose connections in a fuel cell system.

Abstract

This invention discloses a method, apparatus, device, and storage medium for diagnosing loose connections in a fuel cell system. The invention relates to the field of fuel cell technology. The loose connection diagnosis method includes: acquiring the measured voltage value and average voltage value of each cell in the fuel cell stack; determining the voltage value of each channel based on each measured voltage value; determining whether the voltage value of the k-th high-channel and the voltage value of the k-th low-channel are adjacent channels; when the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels, determining whether a loose connection fault exists in the k-th channel based on the voltage value of the k-th low-channel, the average voltage value, and the loose connection threshold voltage value. The technical solution of this invention can achieve more accurate loose connection diagnosis and can identify multi-channel loose connection faults, improving the reliability of fuel cell engines against false alarms due to loose connections from voltage monitoring units.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a method, apparatus, device, and storage medium for diagnosing loose connections in a fuel cell system. Background Technology

[0002] The health status of a fuel cell is primarily reflected in its individual cell voltage. Adverse operating conditions such as excessive dryness, excessive moisture, and lack of gas, as well as mechanical damage, can all alter the individual cell voltage. Therefore, a voltage monitoring unit is needed to collect and monitor the individual cell voltages of the fuel cell in real time.

[0003] The voltage monitoring unit in a fuel cell primarily collects individual cell voltage signals and sends them to the fuel cell system controller. The operating status of the fuel cell stack is determined by checking these individual cell voltage signals. However, poor contact may exist between the voltage monitoring unit and the fuel cell stack, resulting in intermittent connections between the voltage monitoring unit and individual cells. Current technologies have low accuracy in identifying intermittent connections by the voltage monitoring unit and cannot identify intermittent connections during fuel cell operation or multi-channel intermittent connection problems. Summary of the Invention

[0004] This invention provides a method, apparatus, device, and storage medium for diagnosing loose connections in a fuel cell system, in order to solve the problems of low accuracy in identifying loose connections in voltage monitoring units and the inability to identify loose connections and multi-channel loose connections during fuel cell operation in the prior art.

[0005] According to a first aspect of the present invention, a method for diagnosing loose connections in a fuel cell system is provided, comprising: Obtain the measured voltage and average voltage of each cell in the fuel cell stack; Determine the voltage value for each channel based on each measured voltage value; Determine whether the k-th high-channel voltage value and the k-th low-channel voltage value are adjacent channels; where k is a positive integer and k≤n; n is the number of all channel voltage values; the k-th high-channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are sorted in descending order; the k-th low-channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are sorted in ascending order. When the high-channel voltage value of level k and the low-channel voltage value of level k are adjacent channels, the presence of a loose connection fault in the level k channel is determined based on the low-channel voltage value of level k, the average voltage value, and the critical voltage value for loose connection; where the level k channel is the channel corresponding to the low-channel voltage value of level k.

[0006] Optionally, the presence of a loose connection fault in the k-th level channel can be determined based on the k-th level low-channel voltage value, average voltage value, and loose connection threshold voltage value, including: Acquire the operating status of the fuel cell engine; the operating status includes standby status and start-up status; When the fuel cell engine is in standby mode, the presence of a loose connection fault in the k-th stage channel is determined based on the low-channel voltage value of the k-th stage and the critical voltage value for loose connection. When the fuel cell engine is running, the presence of a loose connection fault in the k-th stage channel is determined based on the low-channel voltage value, average voltage value, and critical voltage value for loose connection in the k-th stage.

[0007] Optionally, the presence of a loose connection fault in the k-th channel can be determined based on the k-th low-channel voltage value and the loose connection threshold voltage value, including: When the voltage value of the k-th low channel is less than or equal to the critical voltage value for virtual connection, the k-th channel is judged to be in normal state. When the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th channel is judged to be a loose connection fault.

[0008] Optionally, the presence of a loose connection fault in the k-th level channel can be determined based on the k-th level low-channel voltage value, average voltage value, and loose connection threshold voltage value, including: When the difference between the average voltage value and the voltage value of the k-th low-level channel is less than or equal to the critical voltage value for a false connection, the k-th level channel is judged to be in a normal state. When the difference between the average voltage value and the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th channel is judged to be a loose connection fault.

[0009] Optionally, when the difference between the average voltage value and the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th level channel is determined to have a loose connection fault, including: When the difference between the average voltage value and the voltage value of the k-th low channel is greater than the critical voltage value for virtual connection, a closing signal is output to the relay corresponding to the voltage value of the k-th high channel to control the relay contacts to close. Obtain the updated measured voltage value of the single cell in the fuel cell stack corresponding to the k-th low-channel voltage value; wherein, the updated measured voltage value is the measured voltage value obtained after the relay contacts are closed; The voltage change value is determined based on the updated measured voltage value and the k-th low-channel voltage value; When the voltage change value is greater than the preset change value, the k-th channel is determined to be a loose connection fault.

[0010] Optionally, the voltage change value is determined based on the updated measured voltage value and the k-th low-channel voltage value, including: The updated channel voltage value is determined based on the updated measured voltage value; The voltage change value is determined based on the updated channel voltage value and the k-th low-level channel voltage value.

[0011] Optionally, after determining whether a loose connection fault exists in the k-th level channel based on the k-th level low-channel voltage value, average voltage value, and loose connection threshold voltage value, the method further includes: Obtain the number of channel failures; where the number of channel failures refers to the number of channels with intermittent connection failures. When the number of channel faults is greater than or equal to the preset number of faults, a power limiting signal is output to the fuel cell; An alarm signal is output when the number of channel faults is less than the preset number of faults.

[0012] According to a second aspect of the present invention, a faulty connection diagnostic device for a fuel cell system is provided, for performing a faulty connection diagnostic method for a fuel cell system, the faulty connection diagnostic device comprising: The voltage acquisition unit is used to acquire the measured voltage value and average voltage value of each cell in the fuel cell stack. The channel voltage calculation unit is used to determine the voltage value of each channel based on each measured voltage value. The channel determination unit is used to determine whether the k-th high channel voltage value and the k-th low channel voltage value are adjacent channels; where k is a positive integer and k≤n; n is the number of all channel voltage values; the k-th high channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are sorted in descending order; the k-th low channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are sorted in ascending order. The loose connection judgment unit is used to determine whether there is a loose connection fault in the k-th level channel when the high-channel voltage value of the k-th level and the low-channel voltage value of the k-th level are adjacent channels, based on the low-channel voltage value of the k-th level, the average voltage value, and the loose connection critical voltage value; wherein, the k-th level channel is the channel corresponding to the low-channel voltage value of the k-th level.

[0013] According to a third aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a method for diagnosing virtual connections.

[0014] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements a method for diagnosing dummy connections.

[0015] The technical solution of this invention, based on the influence of the virtual connection resistance on the circuit between the voltage inspection unit and the fuel cell stack, determines whether the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels, thus determining the existence and location of the virtual connection resistance. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels, it determines whether there is a virtual connection fault in the k-th channel based on the k-th low-channel voltage value, the average voltage value, and the virtual connection threshold voltage value. This enables more accurate virtual connection diagnosis and can identify virtual connection faults in multiple channels, improving the reliability of fuel cell engines due to false alarms caused by virtual connections in the voltage inspection unit.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a circuit connection diagram of a fuel cell system and a voltage monitoring unit according to an embodiment of the present invention; Figure 2 This is a flowchart of a first method for diagnosing a loose connection in a fuel cell system according to an embodiment of the present invention; Figure 3 This is a flowchart of a second method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention; Figure 4 This is a flowchart of a third method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention; Figure 5 This is a flowchart of a fourth method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention; Figure 6 This is a flowchart of a fifth method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention; Figure 7 This is a flowchart of a sixth method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention; Figure 8 This is a flowchart of a seventh method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention; Figure 9This is a connection diagram of a faulty connection diagnostic device for a fuel cell system according to an embodiment of the present invention; Figure 10 This is a schematic diagram of a computer device structure for a method of diagnosing loose connections in a fuel cell system, provided by an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Figure 1 This is a circuit connection diagram of a fuel cell system and a voltage monitoring unit according to an embodiment of the present invention. Figure 2 This is a flowchart of a first method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, this method for diagnosing loose connections includes: S10. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0022] The entity executing this faulty connection diagnostic method can be a fuel cell controller. The fuel cell controller can receive relevant information from the voltage monitoring unit 1. The voltage monitoring unit 1 may include a data acquisition chip and related circuitry, which can be used to acquire the measured voltage values ​​of individual cells in the fuel cell stack and calculate the average voltage value of each cell. The fuel cell controller receives both the measured voltage values ​​and the average voltage value.

[0023] For example, such as Figure 1The diagram shows the circuit connection between voltage monitoring unit 1 and the fuel cell. The fuel cell stack comprises n individual cells, and voltage monitoring unit 1 includes a data acquisition chip and a grounding resistor. (See diagram...) This corresponds to n individual cells in a fuel cell stack; the acquisition chip includes multiple pins, with one pin corresponding to the positive and negative terminals of each individual cell. Each pin also includes a grounding resistor connected to the ground terminal. Where i is a positive integer and i ≤ n. The positive terminal of the first cell in the stack is also electrically connected to a voltage source, the voltage of which is [value missing]. Under normal operating conditions, the acquisition chip can obtain the voltage value at each pin and use this voltage value as the measured voltage value of each cell in the fuel cell stack. Voltage monitoring unit 1 can calculate the average voltage value based on all measured voltage values. When no loose connection fault occurs, the voltage values ​​at the positive and negative terminals of the individual cells in the fuel cell stack are the same as the voltage values ​​at the corresponding pins. Assume the actual voltage value of the individual cells in the fuel cell stack is... Under the condition of no loose connection fault, the measured voltage value obtained by voltage inspection unit 1 is... and Same, that is .

[0024] S11. Determine the voltage value of each channel based on each measured voltage value.

[0025] The channel voltage value of each cell in the stack can be calculated based on the measured voltage value of each cell. Each cell in the stack corresponds to one channel voltage value, so the number of channel voltage values ​​is n.

[0026] Specifically, the channel voltage value can be obtained through... , , , ... The calculation yielded, where This indicates the voltage value of each channel.

[0027] S12. Determine whether the k-th high-channel voltage value and the k-th low-channel voltage value are adjacent channels. Where k is a positive integer and k≤n; n is the number of all channel voltage values; the k-th high-channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are sorted in descending order; the k-th low-channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are sorted in ascending order.

[0028] Among them, the adjacent channels can be the channels corresponding to the single cells of adjacent fuel cell stacks.

[0029] In determining adjacent channels, all channel voltage values ​​can be sorted in descending order first, then in ascending order, and then the high and low channel voltage values ​​of the same level can be compared to determine whether they are adjacent channels, until all channel voltage values ​​are traversed.

[0030] Specifically, all channel voltage values ​​are sorted in descending order, and then in ascending order. The voltage values ​​of the first-level high channel and the first-level low channel are compared to determine if they are adjacent; the voltage values ​​of the second-level high channel and the second-level low channel are compared to determine if they are adjacent; the voltage values ​​of the third-level high channel and the third-level low channel are compared to determine if they are adjacent; and the voltage values ​​of the kth-level high channel are... and the k-th low-channel voltage value The comparison is performed to determine whether the channels are adjacent, until the voltage values ​​of the nth high-level channel and the nth low-level channel are compared to determine whether they are adjacent. It can be understood that the voltage value of the first high-level channel is the highest channel voltage value among all channel voltage values, the voltage value of the first low-level channel is the lowest channel voltage value among all channel voltage values, and so on.

[0031] It is understandable that when a loose connection fault exists, a corresponding loose connection resistor will divide the voltage in the circuit. For example, such as... Figure 1 As shown, assuming If a loose connection fault occurs in the corresponding channel, then the corresponding There is a dummy resistance Ra between the positive terminal and the pin. Because... A loose connection fault occurred in the corresponding channel, causing voltage drop due to the loose connection resistor. The measured voltage value... Less than the actual voltage value .because , Therefore, when a loose connection fault occurs, the presence of the loose connection resistance will reduce the resistance. And rise Based on the above data characteristics, this embodiment of the invention determines the channel voltage value at the same level.

[0032] For example, among all channel voltage values This is the minimum channel voltage value. This is the maximum channel voltage value, and at this time... and The corresponding channels are adjacent channels.

[0033] S13. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels, determine whether there is a loose connection fault in the k-th channel based on the k-th low-channel voltage value, the average voltage value, and the critical voltage value for loose connection. The k-th channel is the channel corresponding to the k-th low-channel voltage value.

[0034] Among them, the critical voltage value for a loose connection can be used as a critical voltage value to judge the degree of impact of a loose connection fault.

[0035] Among them, when the k-th high-channel voltage value and the k-th low-channel voltage value When the channels are adjacent, it indicates that a loose connection resistor exists, causing the voltage value of the adjacent channel to change. Continue to use the voltage value of the lower channel at level k. The average voltage value and the critical voltage value of the virtual connection are used to determine whether the voltage division caused by the virtual connection voltage of the k-th channel affects the voltage acquisition of the voltage inspection unit 1. If the virtual connection resistance is small, it can be ignored and it is determined that there is no virtual connection fault. If the virtual connection resistance is large and affects the detection of the voltage inspection unit 1, it is determined that there is a virtual connection fault.

[0036] For example, obtaining the measured voltage value and average voltage value. Based on the measured voltage value Calculate channel voltage value The channel voltage values ​​are sorted in descending and ascending order according to their magnitude, and the voltage values ​​of higher and lower channels of the same level are compared to determine whether they are adjacent channels. When the voltage value of the k-th higher channel... and the k-th low-channel voltage value If the channels are adjacent, it indicates that there is a loose connection resistor affecting the channel voltage value of the adjacent channel. Continue to determine whether the loose connection resistor affects the acquisition of voltage inspection unit 1 based on the voltage value of the k-th low channel, the average voltage value and the loose connection critical voltage value, and then determine whether a loose connection fault has occurred.

[0037] The technical solution of this invention, based on the influence of the virtual connection resistance on the circuit between the voltage inspection unit and the fuel cell stack, determines whether the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels, determines the existence and location of the virtual connection resistance, and when the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels, determines whether there is a virtual connection fault in the k-th channel based on the k-th low-channel voltage value, the average voltage value, and the virtual connection critical voltage value. This can achieve more accurate virtual connection diagnosis and can identify virtual connection faults in multiple channels, improving the reliability of fuel cell engines due to false alarms caused by virtual connections in the voltage inspection unit.

[0038] Based on the above embodiments, Figure 3 This is a flowchart of a second method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention, combined with... Figure 1 and Figure 3 As shown, this method for diagnosing loose connections includes: S20. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0039] S21. Determine the voltage value of each channel based on each measured voltage value.

[0040] S22. Determine whether the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels.

[0041] S23. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent, obtain the operating status of the fuel cell engine. The operating status includes standby status and start-up status.

[0042] The fuel cell controller can directly acquire the operating status of the fuel cell engine. In standby mode, the actual voltage of a single cell in the fuel cell stack is 0; in startup mode, the actual voltage of a single cell in the fuel cell stack is not 0.

[0043] S24. When the fuel cell engine is in standby mode, determine whether there is a loose connection fault in the k-th stage channel based on the low channel voltage value of the k-th stage and the critical voltage value for loose connection.

[0044] For example, when the fuel cell is in standby mode, since the actual voltage of a single cell in the stack is 0, a voltage source U0 is applied through the voltage monitoring unit 1. Assume... If a loose connection fault occurs in the corresponding channel, then the corresponding There is a dummy resistance Ra between the positive terminal and the pin. According to the formula... , , ,get ,because The connection is normal. and If they are close, then , . , , and The corresponding channels are adjacent. The fault is compared with the critical voltage value A for a loose connection to determine whether a loose connection fault exists in the k-th channel. This is a loose resistor. This represents the current value in the circuit where the dummy resistor is located.

[0045] S25. When the fuel cell engine is running, determine whether there is a loose connection fault in the k-th stage channel based on the low-channel voltage value, average voltage value, and loose connection threshold voltage value of the k-th stage.

[0046] When the fuel cell engine is running, the actual voltage of each cell in the stack is not zero, and the actual voltage of each cell may not be the same. Therefore, the average voltage value is used for calculation. Assume... If a loose connection fault occurs in the corresponding channel, then the corresponding There is a virtual connection resistance Ra between the positive terminal and the corresponding pin. Assuming... and The corresponding actual voltage values ​​are all average voltage values ​​Uc. (This is obtained...) , . , , and Adjacent. Compare with the critical voltage value A for loose connection to determine whether there is a loose connection fault in the k-th channel.

[0047] Since the embodiments of the present invention require the judgment of adjacent channel voltage values, the loose connection diagnosis method in the embodiments of the present invention is applicable to cases where the number of loose connection channels is less than 1 / 3n. The above embodiments are only for reference. The following explanation uses a case of a loose connection fault in the corresponding channel as an example.

[0048] It is understood that the technical solution of the present invention performs different conditions for judging the loose connection fault according to different operating states of the fuel cell engine. However, regardless of the operating state, it is necessary to judge the adjacent channels of the same level channel voltage value to ensure the accuracy of the loose connection fault diagnosis.

[0049] Based on the above embodiments, Figure 4 This is a flowchart of a third method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention, combined with... Figure 1 and Figure 4 As shown, this method for diagnosing loose connections includes: S30. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0050] S31. Determine the voltage value of each channel based on each measured voltage value.

[0051] S32. Determine whether the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels.

[0052] S33. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent, obtain the operating status of the fuel cell engine.

[0053] S34. When the fuel cell engine is in standby mode, if the voltage value of the k-th low channel is less than or equal to the critical voltage value for virtual connection, the k-th channel is judged to be in normal state.

[0054] Since the actual voltage of a single cell in the stack is close to 0 in standby mode, it is only necessary to compare the voltage value of the k-th low-channel stage with the critical voltage value for virtual connection. When the voltage value of the k-th low-channel stage is... When the value is less than or equal to the critical voltage value A for a malfunctioning connection, it indicates that the resistance of the malfunctioning connection is small and its influence can be ignored, thus it is judged to be in a normal state.

[0055] S35. When the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th channel is judged to be a loose connection fault.

[0056] Among them, when the k-th low-channel voltage value If the voltage exceeds the critical voltage value A for a loose connection, it indicates that the loose connection resistance is too large and is therefore considered a loose connection fault.

[0057] S36. When the fuel cell engine is in the start-up state, determine whether there is a loose connection fault in the k-th stage channel based on the low-channel voltage value, average voltage value, and loose connection critical voltage value of the k-th stage.

[0058] The technical solution of this invention ignores the influence of the virtual connection resistance when it is determined to be small, and determines the virtual connection resistance fault when it is determined to be large, thus ensuring the normal measurement of the voltage inspection unit.

[0059] Based on the above embodiments, Figure 5 This is a flowchart of a fourth method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention, combined with... Figure 1 and Figure 5 As shown, this method for diagnosing loose connections includes: S40. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0060] S41. Determine the voltage value of each channel based on each measured voltage value.

[0061] S42. Determine whether the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels.

[0062] S43. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent, obtain the operating status of the fuel cell engine.

[0063] S44. When the fuel cell engine is in standby mode, determine whether there is a loose connection fault in the k-th stage channel based on the low channel voltage value of the k-th stage and the critical voltage value for loose connection.

[0064] S45. When the fuel cell engine is in the start-up state, if the difference between the average voltage value and the voltage value of the k-th low channel is less than or equal to the critical voltage value of the virtual connection, the k-th channel is judged to be in a normal state.

[0065] Since the actual voltage value of a single cell in the fuel cell stack is not zero during startup, and assuming that the actual voltage value of a single cell in the fuel cell stack is Uc during startup, an average voltage value is required. With the k-th low-channel voltage value The difference is compared with the critical voltage value for virtual connection. When When the value is less than or equal to the critical voltage value A for a malfunctioning connection, it indicates that the resistance of the malfunctioning connection is small and its influence can be ignored, thus it is judged to be in a normal state.

[0066] S46. When the difference between the average voltage value and the voltage value of the k-th low channel is greater than the critical voltage value for a loose connection, the k-th channel is judged to be a loose connection fault.

[0067] Among them, when If the voltage exceeds the critical voltage value A for a loose connection, it indicates that the loose connection resistance is too large and is therefore considered a loose connection fault.

[0068] The technical solution of this invention ignores the influence of the virtual connection resistance when it is determined to be small, and determines the virtual connection resistance fault when it is determined to be large, thus ensuring the normal measurement of the voltage inspection unit.

[0069] Based on the above embodiments, Figure 6 This is a flowchart of a fifth method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention, combined with... Figure 1 and Figure 6 As shown, this method for diagnosing loose connections includes: S50. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0070] S51. Determine the voltage value of each channel based on each measured voltage value.

[0071] S52. Determine whether the voltage value of the k-th high channel and the voltage value of the k-th low channel are adjacent channels.

[0072] S53. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent, obtain the operating status of the fuel cell engine.

[0073] S54. When the fuel cell engine is in standby mode, determine whether there is a loose connection fault in the k-th stage channel based on the low channel voltage value of the k-th stage and the critical voltage value for loose connection.

[0074] S55. When the fuel cell engine is in the start-up state, if the difference between the average voltage value and the voltage value of the k-th low channel is less than or equal to the critical voltage value of the virtual connection, the k-th channel is judged to be in a normal state.

[0075] S56. When the difference between the average voltage value and the voltage value of the k-th low channel is greater than the critical voltage value for virtual connection, a closing signal is output to the relay corresponding to the voltage value of the k-th high channel to control the relay contacts to close.

[0076] To further ensure the accuracy of detecting loose connections, relays can be installed in voltage monitoring unit 1, with one relay corresponding to each cell in the fuel cell stack. Figure 1 shown There are n relays, each relay is connected in parallel with a single cell of the stack, and each end of the relay is electrically connected to a corresponding pin. A resistor Rc is connected in series between one end of each relay and the pin.

[0077] Specifically, when the difference between the average voltage value and the voltage value of the k-th low-channel is greater than the critical voltage value for a false connection, a closing signal is continuously output to the relay corresponding to the k-th high-channel voltage value to control the corresponding relay to close. After the relay closes, the measured voltage value acquired by the pin will change.

[0078] S57. Obtain the updated measured voltage value of the single cell in the fuel cell stack corresponding to the k-th low-channel voltage value. The updated measured voltage value is the measured voltage value obtained after the relay contacts are closed.

[0079] In this process, the updated measured voltage values ​​of the individual cells in the fuel cell stack corresponding to the k-th low-channel voltage value are continuously obtained.

[0080] S58. Determine the voltage change value based on the updated measured voltage value and the k-th low-channel voltage value.

[0081] Specifically, the updated channel voltage value can be recalculated based on the updated measured voltage value, and the voltage change value is determined based on the updated channel voltage value and the voltage value of the k-th low channel. This voltage change value can be the voltage change value of the current channel after the relay is closed.

[0082] S59. When the voltage change value is greater than the preset change value, the k-th channel is determined to be a loose connection fault.

[0083] The preset change value can be the critical value for the channel voltage change that indicates a loose connection fault. When the voltage change value is greater than the preset change value, the k-th level channel is determined to have a loose connection fault.

[0084] For example, suppose If a loose connection fault occurs in the corresponding channel, then the corresponding There is a dummy resistance Ra between the positive terminal and the corresponding pin. When judging... and When the voltage exceeds the critical voltage value A for virtual connection, control relay S3 closes and collects and updates the measured voltage value. and Understandably, and They are respectively The voltage value at the corresponding pin. Based on the updated measured voltage value. and Calculate and update the voltage channel values ​​and determine the voltage change value by comparing them with the k-th level low channel voltage value. When the voltage changes When the change value is greater than the preset change value D, the k-th channel is determined to be a loose connection fault.

[0085] The technical solution of this invention improves the accuracy of fault detection by using a relay to determine whether a loose connection fault has occurred when the difference between the average voltage value and the voltage value of the k-th low channel is greater than the threshold voltage value for loose connection.

[0086] Based on the above embodiments, Figure 7 This is a flowchart of a sixth method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention, combined with... Figure 1 and Figure 7 As shown, this method for diagnosing loose connections includes: S60. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0087] S61. Determine the voltage value of each channel based on each measured voltage value.

[0088] S62. Determine whether the voltage value of the k-th high channel and the voltage value of the k-th low channel are adjacent channels.

[0089] S63. When the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent, obtain the operating status of the fuel cell engine.

[0090] S64. When the fuel cell engine is in standby mode, determine whether there is a loose connection fault in the k-th stage channel based on the low channel voltage value of the k-th stage and the critical voltage value for loose connection.

[0091] S65. When the fuel cell engine is in the start-up state, if the difference between the average voltage value and the voltage value of the k-th low channel is less than or equal to the critical voltage value of the virtual connection, the k-th channel is judged to be in a normal state.

[0092] S66. When the difference between the average voltage value and the voltage value of the k-th low channel is greater than the critical voltage value for virtual connection, a closing signal is output to the relay corresponding to the voltage value of the k-th high channel to control the relay contacts to close.

[0093] S67. Obtain the updated measured voltage value of the single cell in the fuel cell stack corresponding to the k-th low-channel voltage value.

[0094] S68. Determine the update channel voltage value based on the updated measured voltage value.

[0095] S69. Determine the voltage change value based on the updated channel voltage value and the k-th low channel voltage value.

[0096] S691. When the voltage change value is greater than the preset change value, the k-th channel is determined to be a loose connection fault.

[0097] For example, suppose If a loose connection fault occurs in the corresponding channel, then the corresponding There is a dummy resistance Ra between the positive terminal and the corresponding pin. This occurs when acquiring updated measured voltage values. and After that, through Calculate the update channel voltage value Based on the updated channel voltage value and the k-th low-channel voltage value Calculate voltage change value .when At that time, determine This indicates a loose connection fault.

[0098] Understandable , ,but .

[0099] Based on the above embodiments, Figure 8 This is a flowchart of a seventh method for diagnosing loose connections in a fuel cell system according to an embodiment of the present invention, combined with... Figure 1 and Figure 8 As shown, this method for diagnosing loose connections includes: S70. Obtain the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0100] S71. Determine the voltage value of each channel based on each measured voltage value.

[0101] S72. Determine whether the voltage values ​​of the k-th high-channel and the k-th low-channel are adjacent channels.

[0102] S73. When the voltage values ​​of the high-level channel and the low-level channel are adjacent channels, determine whether there is a loose connection fault in the low-level channel based on the voltage value of the low-level channel, the average voltage value, and the critical voltage value for loose connection.

[0103] S74. Obtain the number of channel faults. The number of channel faults refers to the number of channels with intermittent connection faults.

[0104] The number of channel faults is the total number of channels with detached connection faults as calculated.

[0105] S75. When the number of channel faults is greater than or equal to the preset number of faults, output a power limiting signal to the fuel cell.

[0106] The handling methods differ depending on the number of faults in different channels. When the number of channel faults is greater than or equal to the preset number of faults, a power limiting signal is output to the fuel cell to limit the operating power of the fuel cell and ensure the reliability of the fuel cell engine.

[0107] S76. When the number of channel faults is less than the preset number of faults, an alarm signal is output.

[0108] When the number of channel faults is less than the preset number of faults, an alarm signal is output to the vehicle's instrument panel, and the instrument panel issues a warning to remind the driver.

[0109] The technical solution of this invention achieves more accurate diagnosis of loose connections, thereby improving the reliability of fuel cell engines due to false alarms of loose connections from the voltage inspection unit.

[0110] Based on the same inventive concept. Figure 9 This is a connection diagram of a faulty connection diagnostic device for a fuel cell system according to an embodiment of the present invention, as shown below. Figure 9 As shown, this embodiment of the invention provides a faulty connection diagnostic device for a fuel cell system, used to perform a faulty connection diagnostic method for a fuel cell system. The faulty connection diagnostic device includes: The voltage acquisition unit 100 is used to acquire the measured voltage value and average voltage value of each cell in the fuel cell stack.

[0111] The channel voltage calculation unit 200 is used to determine the voltage value of each channel based on each measured voltage value.

[0112] The channel determination unit 300 is used to determine whether the k-th level high channel voltage value and the k-th level low channel voltage value are adjacent channels. Here, k is a positive integer and k≤n; n is the total number of channel voltage values; the k-th level high channel voltage value is the channel voltage value located at the k-th level when all channel voltage values ​​are sorted in descending order; the k-th level low channel voltage value is the channel voltage value located at the k-th level when all channel voltage values ​​are sorted in ascending order.

[0113] The loose connection judgment unit 400 is used to determine whether a loose connection fault exists in the k-th level channel when the k-th level high channel voltage value and the k-th level low channel voltage value are adjacent channels, based on the k-th level low channel voltage value, the average voltage value, and the loose connection threshold voltage value. The k-th level channel is the channel corresponding to the k-th level low channel voltage value.

[0114] Specifically, firstly, the voltage acquisition unit 100 acquires the measured voltage value and average voltage value of each cell in the stack; then, the channel voltage calculation unit 200 determines the voltage value of each channel based on each measured voltage value; then, the channel judgment unit 300 determines whether the voltage value of the k-th high channel and the voltage value of the k-th low channel are adjacent channels; when the voltage value of the k-th high channel and the voltage value of the k-th low channel are adjacent channels, the loose connection judgment unit 400 determines whether there is a loose connection fault in the k-th channel based on the voltage value of the k-th low channel, the average voltage value, and the loose connection critical voltage value.

[0115] The present invention provides a faulty connection diagnostic device for a fuel cell system that can be used to execute any of the faulty connection diagnostic methods for a fuel cell system provided in the above embodiments, and has corresponding functional modules and the same technical effects.

[0116] Based on the same inventive concept, embodiments of the present invention also provide a computer device. Figure 10 This is a schematic diagram of a computer device structure for a method of diagnosing loose connections in a fuel cell system according to an embodiment of the present invention. Figure 10 As shown, it includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, it implements a method for diagnosing dummy connections in a fuel cell system.

[0117] The term "computer equipment" is intended to refer to various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Computer equipment can also refer to various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0118] like Figure 10 As shown, the computer device 50 includes at least one processor 51 and a memory, such as a read-only memory 52 and a random access memory 53, communicatively connected to the at least one processor 51. The memory stores computer programs executable by the at least one processor. The processor 51 can perform various appropriate actions and processes based on the computer program stored in the read-only memory 52 or loaded from storage unit 58 into the random access memory 53. The random access memory 53 may also store various programs and data required for the operation of the computer device 50. The processor 51, read-only memory 52, and random access memory 53 are interconnected via a bus 54. An I / O interface 55 is also connected to the bus 54.

[0119] Multiple components in computer device 50 are connected to I / O interface 55, including: input unit 56, such as keyboard, mouse, etc.; output unit 57, such as various types of monitors, speakers, etc.; storage unit 58, such as disk, optical disk, etc.; and communication unit 59, such as network card, modem, wireless transceiver, etc. Communication unit 59 allows computer device 50 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0120] Processor 51 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 51 include, but are not limited to, central processing units, graphics processing units, various special-purpose artificial intelligence computing chips, various processors running machine learning model algorithms, digital signal processors, and any suitable processor, controller, microcontroller, etc. Processor 51 performs the various methods and processes described above, such as a method for diagnosing loose connections in a fuel cell system.

[0121] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for diagnosing malfunctions in a fuel cell system.

[0122] Of course, the computer-readable storage medium provided in the embodiments of the present invention has computer-executable instructions that are not limited to the method operations described above, and can also execute related operations in the fissure diagnosis method for fuel cell systems provided in any embodiment of the present invention. (Continue to refer to...) Figure 10 As shown, it is tangibly contained in a computer-readable storage medium, such as storage unit 58. In some embodiments, part or all of the computer program may be loaded and / or installed on the computer device 50 via read-only memory 52 and / or communication unit 59. When the computer program is loaded into random access memory 53 and executed by processor 51, one or more steps of the phantom connection diagnostic method for a fuel cell system described above may be performed. Alternatively, in other embodiments, processor 51 may be configured to perform the phantom connection diagnostic method for a fuel cell system by any other suitable means (e.g., by means of firmware).

[0123] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays, application-specific integrated circuits (ASICs), application-specific standard products (ASICs), systems-on-a-chip (SoCs), payload programmable logic devices, computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0124] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0125] In the context of embodiments of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory, optical fibers, portable compact disk read-only memory, optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0126] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0127] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for diagnosing loose connections in a fuel cell system, characterized in that, include: Obtain the measured voltage and average voltage of each cell in the fuel cell stack; Determine the voltage value of each channel based on each of the measured voltage values; Determine whether the channel corresponding to the k-th high channel voltage value and the channel corresponding to the k-th low channel voltage value are adjacent channels; where k is a positive integer and k≤n; n is the number of all channel voltage values; the k-th high channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are arranged in descending order; the k-th low channel voltage value is the channel voltage value located in the k-th level when all channel voltage values ​​are arranged in ascending order. When the channel corresponding to the k-th high channel voltage value and the channel corresponding to the k-th low channel voltage value are adjacent channels, the k-th channel is judged to have a loose connection fault based on the k-th low channel voltage value, the average voltage value, and the loose connection threshold voltage value; wherein, the k-th channel is the channel corresponding to the k-th low channel voltage value.

2. The method for diagnosing loose connections according to claim 1, characterized in that, Determining whether a loose connection fault exists in the k-th level channel based on the k-th level low-channel voltage value, the average voltage value, and the loose connection threshold voltage value includes: The operating status of the fuel cell engine is obtained; wherein the operating status includes standby status and start-up status; When the fuel cell engine is in the standby state, the presence of a loose connection fault in the k-th stage channel is determined based on the k-th stage low channel voltage value and the loose connection critical voltage value. When the fuel cell engine is in the start-up state, the presence of a loose connection fault in the k-th stage channel is determined based on the k-th stage low channel voltage value, the average voltage value, and the loose connection threshold voltage value.

3. The method for diagnosing loose connections according to claim 2, characterized in that, Determining whether a loose connection fault exists in the k-th level channel based on the k-th level low-channel voltage value and the loose connection threshold voltage value includes: When the voltage value of the k-th low channel is less than or equal to the critical voltage value for virtual connection, the k-th channel is judged to be in normal state. When the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th channel is determined to be a loose connection fault.

4. The method for diagnosing loose connections according to claim 2, characterized in that, Determining whether a loose connection fault exists in the k-th level channel based on the k-th level low-channel voltage value, the average voltage value, and the loose connection threshold voltage value includes: When the difference between the average voltage value and the voltage value of the k-th low-level channel is less than or equal to the critical voltage value for virtual connection, the k-th level channel is determined to be in a normal state. When the difference between the average voltage value and the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th level channel is determined to be a loose connection fault.

5. The method for diagnosing loose connections according to claim 4, characterized in that, When the difference between the average voltage value and the voltage value of the k-th low-level channel is greater than the critical voltage value for a loose connection, the k-th level channel is determined to have a loose connection fault, including: When the difference between the average voltage value and the k-th low-channel voltage value is greater than the virtual connection threshold voltage value, a closing signal is output to the relay corresponding to the k-th high-channel voltage value to control the contact of the relay to close. Obtain the updated measured voltage value of the single cell of the fuel cell stack corresponding to the k-th low-channel voltage value; wherein, the updated measured voltage value is the measured voltage value obtained after the relay contacts are closed; The voltage change value is determined based on the updated measured voltage value and the k-th low-channel voltage value; When the voltage change value is greater than the preset change value, the k-th channel is determined to be a loose connection fault.

6. The method for diagnosing loose connections according to claim 5, characterized in that, The voltage change value is determined based on the updated measured voltage value and the k-th low-channel voltage value, including: The update channel voltage value is determined based on the updated measured voltage value; The voltage change value is determined based on the updated channel voltage value and the k-th low channel voltage value.

7. The method for diagnosing loose connections according to claim 1, characterized in that, After determining whether a loose connection fault exists in the k-th level channel based on the k-th level low-channel voltage value, the average voltage value, and the loose connection threshold voltage value, the method further includes: Obtain the number of channel faults; wherein, the number of channel faults is the number of channels with the virtual connection fault; When the number of channel faults is greater than or equal to the preset number of faults, a power limiting signal is output to the fuel cell. When the number of channel faults is less than the preset number of faults, an alarm signal is output.

8. A diagnostic device for loose connections in a fuel cell system, characterized in that, A method for diagnosing loose connections in a fuel cell system according to any one of claims 1-7, the loose connection diagnostic device comprising: The voltage acquisition unit is used to acquire the measured voltage value and average voltage value of each cell in the fuel cell stack. A channel voltage calculation unit is used to determine the voltage value of each channel based on each of the measured voltage values; A channel determination unit is used to determine whether the channel corresponding to the k-th high channel voltage value and the channel corresponding to the k-th low channel voltage value are adjacent channels; where k is a positive integer and k≤n; n is the number of all the channel voltage values; the k-th high channel voltage value is the channel voltage value located in the k-th level when all the channel voltage values ​​are arranged in descending order; the k-th low channel voltage value is the channel voltage value located in the k-th level when all the channel voltage values ​​are arranged in ascending order. A loose connection judgment unit is used to determine whether there is a loose connection fault in the k-th level channel when the channel corresponding to the k-th level high channel voltage value and the channel corresponding to the k-th level low channel voltage value are adjacent channels, based on the k-th level low channel voltage value, the average voltage value, and the loose connection critical voltage value; wherein, the k-th level channel is the channel corresponding to the k-th level low channel voltage value.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the tethered connection diagnosis method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the tamper diagnostic method as described in any one of claims 1-7.

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