A dynamic diagnosis method, device and equipment for shaft coupling abnormalities and a storage medium

Abstract

The application discloses a kind of coupling exception dynamic diagnosis method, device, equipment and storage medium.Therein, the dynamic diagnosis method includes: obtaining the power generation of range extender, engine actual speed, generator actual speed, generator set speed;When power generation is constant in preset time, according to power generation, engine actual speed, generator actual speed, generator set speed and preset power generation-speed deviation corresponding relation judges whether coupling bolt is abnormal;When coupling bolt is abnormal, coupling is overhauled.The technical scheme of the application, by obtaining the power generation, engine actual speed, generator actual speed, generator set speed, in combination with preset power generation-speed deviation corresponding relation, the characteristics of speed dynamic fluctuation after coupling bolt fracture are identified, according to the characteristics, coupling abnormal diagnosis is carried out, when judging coupling bolt is abnormal, timely overhauling is carried out, to avoid causing range extender further damage.

Description

Technical Field

[0001] This invention relates to the field of range extender technology, and in particular to a dynamic diagnostic method, apparatus, device, and storage medium for coupling malfunctions. Background Technology

[0002] A range extender is an onboard generator primarily used to charge the battery of an electric vehicle, rather than directly driving the vehicle. When the battery is low, the range extender starts generating electricity to extend the vehicle's driving range; it is commonly found in range-extended electric vehicles. A range extender mainly consists of an engine, a coupling, and a generator, with the engine and generator connected via the coupling. A flexible coupling is typically included in the range extender. A flexible coupling is a mechanical component used to connect two rotating shafts and transmit torque; it can absorb vibrations, compensate for alignment errors (such as axial, radial, and angular misalignment), and mitigate impact loads. In range extender systems, flexible couplings are used for vibration reduction and improving operational smoothness.

[0003] However, during long-term operation of the range extender, coupling bolts may break. Broken coupling bolts can affect the connection between the engine and generator, thus impacting power transmission between them. Current technology cannot promptly identify and diagnose broken coupling bolts in the range extender. Summary of the Invention

[0004] This invention provides a dynamic diagnostic method, apparatus, device, and storage medium for coupling malfunctions, to solve the problem in the prior art that coupling bolt breakage cannot be diagnosed and identified when it occurs in a range extender.

[0005] According to a first aspect of the present invention, a dynamic diagnostic method for coupling malfunctions is provided, comprising:

[0006] Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed;

[0007] When the power generation is constant within a preset time, the coupling bolts are judged to be abnormal based on the power generation, actual engine speed, actual generator speed, generator set speed and preset power generation-speed deviation.

[0008] When the coupling bolts are abnormal, the coupling should be inspected and repaired.

[0009] Optionally, the abnormality of the coupling bolts can be determined based on the correspondence between the power generation capacity, the actual engine speed, the actual generator speed, the generator set speed, and the preset power generation capacity-speed deviation, including:

[0010] The first speed deviation is calculated based on the actual engine speed and the set generator speed; the second speed deviation is calculated based on the actual generator speed and the set generator speed; and the third speed deviation is calculated based on the actual engine speed and the actual generator speed.

[0011] Determine whether the coupling bolts are abnormal based on the power generation, first speed deviation, second speed deviation, third speed deviation, and the preset power generation-speed deviation correspondence.

[0012] Optionally, the preset power generation-speed deviation includes a first speed deviation threshold, a second speed deviation threshold, and a third speed deviation threshold corresponding to the power generation.

[0013] When the coupling bolts are abnormal, the coupling should be inspected, including:

[0014] When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolts are judged to be abnormal, and the coupling is repaired.

[0015] Optionally, when the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolt is judged to be abnormal, including:

[0016] When the number of abnormalities reaches a preset number, the coupling bolt is determined to be abnormal; where the number of abnormalities is the cumulative number of times that the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold.

[0017] Optionally, when the power generation is constant within a preset time, after determining whether the coupling bolts are abnormal based on the power generation, actual engine speed, actual generator speed, generator set speed, and the preset power generation-speed deviation correspondence, the following steps are also included:

[0018] When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is less than the first speed deviation threshold, and the third speed deviation is less than the third speed deviation threshold, the coupling bolts are judged to be normal.

[0019] When the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling is judged to be abnormal and the coupling is repaired.

[0020] Optionally, when the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling is judged to be abnormal, including:

[0021] When the duration of the abnormality exceeds the set abnormal time threshold, the coupling is determined to be abnormal; wherein, the abnormal duration is the duration during which the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold.

[0022] Optionally, the abnormality of the coupling bolts can be determined based on the correspondence between the power generation capacity, the actual engine speed, the actual generator speed, the generator set speed, and the preset power generation capacity-speed deviation, including:

[0023] When no fault torque limiting signal is received, the coupling bolts are judged to be abnormal based on the generator power, engine actual speed, generator actual speed, generator set speed and preset generator power-speed deviation correspondence.

[0024] According to a second aspect of the present invention, a diagnostic apparatus for coupling malfunction is provided, for performing a dynamic diagnostic method for coupling malfunction, the diagnostic apparatus comprising:

[0025] The parameter acquisition module is used to acquire the range extender's power generation, actual engine speed, actual generator speed, and set generator speed.

[0026] The anomaly detection module is used to determine whether the coupling bolts are abnormal when the power generation is constant within a preset time, based on the power generation, actual engine speed, actual generator speed, generator set speed and preset power generation-speed deviation correspondence.

[0027] The maintenance module is used to inspect the coupling when the coupling bolts are abnormal.

[0028] 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 dynamic diagnostic method for coupling malfunctions.

[0029] 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 dynamic diagnosis of coupling malfunctions.

[0030] The technical solution of this invention obtains the power generation, actual engine speed, actual generator speed, and set generator speed, and combines the preset power generation-speed deviation correspondence to identify the characteristics of dynamic speed fluctuation after coupling bolt breakage. Based on these characteristics, the coupling is diagnosed as abnormal. When the coupling bolt is found to be abnormal, it is repaired in a timely manner to avoid further damage to the range extender and ensure driving safety.

[0031] 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

[0032] 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.

[0033] Figure 1 This is a flowchart of a first dynamic diagnostic method for coupling abnormalities provided according to an embodiment of the present invention;

[0034] Figure 2 This is a comparison diagram of the actual engine speed and the actual generator speed when the coupling malfunctions, provided by an embodiment of the present invention.

[0035] Figure 3 This is a flowchart of a second dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention;

[0036] Figure 4 This is a flowchart of a third dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention;

[0037] Figure 5 This is a flowchart of a fourth dynamic diagnostic method for coupling abnormalities provided in an embodiment of the present invention;

[0038] Figure 6 This is a flowchart of a fifth dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention;

[0039] Figure 7 This is a flowchart of a sixth type of dynamic diagnostic method for coupling abnormalities provided in an embodiment of the present invention;

[0040] Figure 8 This is a flowchart of a seventh dynamic diagnostic method for coupling abnormalities provided in an embodiment of the present invention;

[0041] Figure 9 This is a connection diagram of a diagnostic device for coupling malfunction provided according to an embodiment of the present invention;

[0042] Figure 10 This is a schematic diagram of an electronic device structure for a dynamic diagnostic method for coupling malfunctions provided in an embodiment of the present invention. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] Figure 1 This is a flowchart of a first dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention. Figure 1 As shown, this dynamic diagnostic method includes:

[0046] S10: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0047] The dynamic diagnostic method of this invention can be applied to hybrid vehicles. In hybrid vehicles, the range extender is electrically connected to the power battery and can be used to supply power to the power battery; the power battery is electrically connected to the drive motor and can provide electrical energy to the drive motor. The range extender includes an engine, a coupling, and a generator. The engine is connected to the generator via the coupling. Under normal operating conditions, the engine and generator rotate at essentially the same speed.

[0048] The purpose of acquiring the generated power is to monitor the current operating status of the range extender. Since this dynamic diagnostic method requires combining the actual engine speed and the actual generator speed, acquiring the generated power can determine whether the range extender is currently operating at a constant power. If the current generated power is not constant, then the actual engine speed and the actual generator speed are theoretically not constant values, so it is impossible to make a judgment based on the actual engine speed and the actual generator speed, and the dynamic diagnostic method cannot be executed. If the current generated power is constant, then the actual engine speed and the actual generator speed are theoretically constant under constant power, and thus the dynamic diagnostic method in this embodiment of the invention can be executed.

[0049] Among them, the actual engine speed can be the speed value actually measured during engine operation; the actual generator speed can be the speed value actually measured during generator operation; and the generator set speed can be the target speed value issued by the vehicle controller to the generator according to the current operating conditions.

[0050] S11. When the power generation is constant within a preset time, determine whether the coupling bolts are abnormal based on the power generation, actual engine speed, actual generator speed, generator set speed, and preset power generation-speed deviation.

[0051] When the power output of the range extender remains constant within a preset time, it indicates that the range extender is in a constant power state, and dynamic diagnosis of coupling abnormalities can be performed. Therefore, at this time, the preset speed deviation parameters under the current power output are determined based on the power output and the preset power output-speed deviation, and the actual speed deviation parameters are determined based on the actual engine speed, the actual generator speed, and the generator set speed. The coupling bolts are then checked for abnormalities based on the preset speed deviation parameters and the actual speed deviation parameters.

[0052] The preset power generation-speed deviation can be the preset speed deviation parameters corresponding to each generator power. The preset speed deviation parameters corresponding to the obtained power generation can be determined and used as a benchmark to judge the actual speed deviation parameters.

[0053] The coupling bolts affect the connection between the coupling and the engine and / or the coupling and the generator, thus affecting the transmission between the generator and the engine. The impact of the failure of different numbers of coupling bolts on the actual speed of the generator and the actual speed of the engine is also different. Therefore, in this embodiment of the invention, the actual speed deviation parameter is compared with the preset speed deviation parameter to determine whether the coupling has broken.

[0054] S12. When the coupling bolts are abnormal, the coupling shall be inspected and repaired.

[0055] If the actual speed deviation parameter is not within the preset speed deviation parameter range, it indicates that the coupling bolts are abnormal. The vehicle should be powered off and the coupling should be inspected.

[0056] For example, when the driver powers on the machine and starts working, the generator power, engine speed, generator speed and generator set speed are obtained. When the generator power of the range extender is constant, the coupling bolts are checked for abnormality based on the generator power, engine speed, generator speed, generator set speed and preset generator power-speed deviation. If the coupling bolts are checked for abnormality, the coupling is inspected.

[0057] Understandable, Figure 2 This is a comparison diagram of the actual engine speed and the actual generator speed when the coupling malfunctions, provided by an embodiment of the present invention. Figure 2 As shown, when individual coupling bolts malfunction, the generator's actual speed initially stabilizes, but the engine's actual speed fluctuates due to the coupling's influence. Figure 2 The solid black line represents the actual generator speed, and the dashed line represents the actual engine speed. Figure 2 As can be seen, the actual engine speed fluctuates significantly, while the actual generator speed is relatively stable. When the coupling bolts malfunction, a large difference between the actual engine speed and the actual generator speed will frequently occur (i.e.,...). Figure 2 The speed difference of the coupling is shown in the figure. After a period of time, the speed difference will return to the normal level. To address this phenomenon, the technical solution of this embodiment of the invention acquires and monitors the actual engine speed and the actual generator speed. Due to the involvement of the generator's set speed, even small fluctuations in the actual engine speed and the actual generator speed can be identified by the dynamic diagnostic method in this embodiment of the invention. In this embodiment of the invention, small fluctuations in the actual engine speed and the actual generator speed are determined to be due to coupling bolt breakage. When the actual engine speed and the actual generator speed fluctuate within a large range, it indicates that there may be more than just a broken coupling bolt; the coupling may have a serious fault. In this case, the machine should be stopped immediately for repair.

[0058] The technical solution of this invention obtains the power generation, actual engine speed, actual generator speed, and set generator speed, and combines the preset power generation-speed deviation correspondence to identify the characteristics of dynamic speed fluctuation after coupling bolt breakage. Based on these characteristics, the coupling is diagnosed as abnormal. When the coupling bolt is found to be abnormal, it is repaired in a timely manner to avoid further damage to the range extender and ensure driving safety.

[0059] Based on the above embodiments, Figure 3 This is a flowchart of a second dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention, as shown below. Figure 3 As shown, this dynamic diagnostic method includes:

[0060] S20: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0061] S21. When the power generation is constant within a preset time, calculate the first speed deviation based on the actual engine speed and the set generator speed, calculate the second speed deviation based on the actual generator speed and the set generator speed, and calculate the third speed deviation based on the actual engine speed and the actual generator speed.

[0062] The first speed deviation can be the speed difference between the actual engine speed and the set generator speed; the second speed deviation can be the speed difference between the actual generator speed and the set generator speed; and the third speed deviation can be the speed difference between the actual engine speed and the actual generator speed.

[0063] Since the generator and engine are rigidly connected by a coupling, under normal conditions of the range extender, the actual engine speed is equal to the actual engine speed, and the actual generator speed is equal to the generator set speed. Therefore, in this embodiment of the invention, the first speed deviation can characterize the deviation between the actual engine speed and the target value, the second speed deviation can characterize the deviation between the actual generator speed and the target value, and the third speed deviation can characterize the deviation between the actual generator speed and the actual engine speed.

[0064] S22. Determine whether the coupling bolts are abnormal based on the power generation, first speed deviation, second speed deviation, third speed deviation and preset power generation-speed deviation correspondence.

[0065] Among them, based on the correspondence between the power generation and the preset power generation-speed deviation, the deviation threshold between the actual engine speed and the target value under the current power generation, the deviation threshold between the actual generator speed and the target value, and the deviation threshold between the actual generator speed and the actual engine speed can be obtained. Therefore, the first speed deviation, the second speed deviation, the third speed deviation and each corresponding deviation threshold can be compared to determine whether the coupling bolts are abnormal.

[0066] S23. When the coupling bolts are abnormal, the coupling shall be inspected and repaired.

[0067] The technical solution of this invention realizes dynamic diagnosis of the coupling by judging whether the actual speed of the engine and the actual speed of the generator frequently differ based on the first speed deviation, the second speed deviation, the third speed deviation and the preset power generation-speed deviation correspondence.

[0068] Based on the above embodiments, the preset power generation-speed deviation includes a first speed deviation threshold, a second speed deviation threshold, and a third speed deviation threshold corresponding to the power generation. Figure 4 This is a flowchart of a third dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention, as shown below. Figure 4 As shown, this dynamic diagnostic method includes:

[0069] S30: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0070] S31. When the power generation is constant within a preset time, calculate the first speed deviation based on the actual engine speed and the set generator speed, calculate the second speed deviation based on the actual generator speed and the set generator speed, and calculate the third speed deviation based on the actual engine speed and the actual generator speed.

[0071] S32. Determine whether the coupling bolts are abnormal based on the power generation, first speed deviation, second speed deviation, third speed deviation and preset power generation-speed deviation correspondence.

[0072] S33. When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolts are judged to be abnormal, and the coupling is repaired.

[0073] The first speed deviation threshold can be the deviation threshold between the actual engine speed and the target value under the current power generation; the second speed deviation threshold can be the deviation threshold between the actual generator speed and the target value under the current power generation; and the third speed deviation can be the deviation threshold between the actual generator speed and the actual engine speed under the current power generation.

[0074] When the coupling bolt breaks, the actual engine speed will fluctuate due to the influence of the coupling. Therefore, when the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, it indicates that the actual engine speed is fluctuating. However, the actual generator speed is still running according to the set speed. The difference between the actual engine speed and the actual generator speed is too large. At this time, it is a small range of speed fluctuation, and it is determined that the coupling bolt is abnormal. The coupling needs to be repaired.

[0075] The technical solution of this invention, based on the characteristic that the first phenomenon when the coupling bolt breaks is the fluctuation of the actual engine speed while the actual generator speed remains unchanged, determines whether the range extender has experienced coupling breakage. If the coupling is not affected by the failure to drive safely, it is repaired in a timely manner. By identifying coupling bolt failures in advance, further damage to the internal parts of the coupling is avoided.

[0076] Based on the above embodiments, Figure 5 This is a flowchart of a fourth dynamic diagnostic method for coupling malfunctions provided according to an embodiment of the present invention, as shown below. Figure 5 As shown, this dynamic diagnostic method includes:

[0077] S40: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0078] S41. When the power generation is constant within a preset time, calculate the first speed deviation based on the actual engine speed and the set generator speed, calculate the second speed deviation based on the actual generator speed and the set generator speed, and calculate the third speed deviation based on the actual engine speed and the actual generator speed.

[0079] S42. Determine whether the coupling bolts are abnormal based on the power generation, first speed deviation, second speed deviation, third speed deviation and preset power generation-speed deviation correspondence.

[0080] S43. When the number of abnormal occurrences reaches a preset number, the coupling bolts are determined to be abnormal. The number of abnormal occurrences is the cumulative number of times the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold.

[0081] To prevent frequent vehicle shutdowns due to system errors, an exception count is set. The preset count can be the minimum number of times the coupling bolt is detected as broken. When the preset count is reached, it indicates that the actual engine speed is fluctuating frequently, thus indicating an abnormality in the coupling bolt.

[0082] Understandably, the varying degrees of fracture in the coupling bolts will result in different durations of abnormal operation. This duration can be considered the time it takes for the engine's actual speed to fluctuate. For example, when half of the coupling bolt is fractured, the engine's actual speed may fluctuate at the current moment and return to normal at the next moment. Similarly, when three-quarters of the coupling bolt is fractured, the engine's actual speed may fluctuate at the current moment and return to normal at the next moment. However, the duration of the abnormal fluctuation in engine speed is longer when only half of the coupling bolt is fractured compared to when only half of the coupling bolt is fractured. Therefore, the presence of minor fractures in the coupling bolts can be determined by statistically analyzing the number of abnormal occurrences.

[0083] The technical solution of this invention determines that the coupling bolts are abnormal when the number of abnormalities reaches a preset number, thus avoiding the problem of frequent vehicle shutdowns for maintenance due to false alarms in the system and improving the accuracy of dynamic diagnosis.

[0084] Based on the above embodiments, Figure 6 This is a flowchart of the fifth dynamic diagnostic method for coupling malfunctions provided in the embodiments of the present invention, as shown below. Figure 6 As shown, this dynamic diagnostic method includes:

[0085] S50: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0086] S51. When the power generation is constant within a preset time, calculate the first speed deviation based on the actual engine speed and the set generator speed, calculate the second speed deviation based on the actual generator speed and the set generator speed, and calculate the third speed deviation based on the actual engine speed and the actual generator speed.

[0087] S52. Determine whether the coupling bolts are abnormal based on the power generation, first speed deviation, second speed deviation, third speed deviation and preset power generation-speed deviation correspondence.

[0088] S53. When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolts are judged to be abnormal, and the coupling is repaired.

[0089] S54. When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is less than the first speed deviation threshold, and the third speed deviation is less than the third speed deviation threshold, the coupling bolts are judged to be normal.

[0090] Specifically, when the second speed deviation is less than the second speed deviation threshold, the first speed deviation is less than the first speed deviation threshold, and the third speed deviation is less than the third speed deviation threshold, it indicates that the actual engine speed and the actual generator speed are both within the normal range, so the coupling bolts are normal at this time.

[0091] S55. When the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling is judged to be abnormal and the coupling is repaired.

[0092] When the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, it indicates that both the actual engine speed and the actual generator speed are fluctuating. This may be due to a serious abnormality in the coupling, so an emergency shutdown and maintenance of the coupling is required.

[0093] The technical solution of this invention provides different judgment results when the first speed deviation, the second speed deviation, and the third speed deviation meet different conditions, and distinguishes between abnormal coupling bolts and severe coupling abnormalities, thereby meeting different maintenance conditions and improving the accuracy, safety, and efficiency of dynamic diagnosis.

[0094] Based on the above embodiments, Figure 7 This is a flowchart of the sixth type of dynamic diagnostic method for coupling malfunctions provided by an embodiment of the present invention, as shown below. Figure 7 As shown, this dynamic diagnostic method includes:

[0095] S60: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0096] S61. When the power generation is constant within a preset time, calculate the first speed deviation based on the actual engine speed and the set generator speed, calculate the second speed deviation based on the actual generator speed and the set generator speed, and calculate the third speed deviation based on the actual engine speed and the actual generator speed.

[0097] S62. Determine whether the coupling bolts are abnormal based on the power generation, first speed deviation, second speed deviation, third speed deviation and preset power generation-speed deviation correspondence.

[0098] S63. When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolts are judged to be abnormal, and the coupling is repaired.

[0099] S64. When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is less than the first speed deviation threshold, and the third speed deviation is less than the third speed deviation threshold, the coupling bolts are judged to be normal.

[0100] S65. When the abnormal duration exceeds the set abnormal time threshold, the coupling is determined to be abnormal. The abnormal duration is defined as the duration during which the second speed deviation exceeds the second speed deviation threshold, the first speed deviation exceeds the first speed deviation threshold, and the third speed deviation exceeds the third speed deviation threshold.

[0101] The abnormal duration can be the time during which the actual engine speed fluctuates. For example, when half of the coupling bolts are broken, the actual engine speed will fluctuate at the current moment and return to normal at the next moment. Similarly, when three-quarters of the coupling bolts are broken, the actual engine speed will fluctuate at the current moment and return to normal at the next moment. However, the abnormal duration of the engine speed fluctuation is longer than that when half of the coupling bolts are broken. Therefore, the abnormal duration is used to determine whether there is a serious abnormality in the coupling.

[0102] Specifically, when the duration of the abnormality exceeds the set abnormal time threshold, it indicates that both the actual engine speed and the actual generator speed are fluctuating for a certain period of time. This may be due to a serious abnormality in the coupling. Therefore, an emergency shutdown and repair of the coupling is necessary to avoid jeopardizing driving safety.

[0103] It is understood that the embodiments of the present invention determine different abnormal judgment criteria based on different degrees of coupling bolt fracture, namely, one is judged by the number of abnormalities and the other is judged by the duration of abnormalities, thereby accurately judging different fracture conditions and other conditions besides bolt fracture, improving the accuracy and reliability of range extender abnormal judgment.

[0104] Based on the above embodiments, Figure 8 This is a flowchart of the seventh type of dynamic diagnostic method for coupling malfunctions provided by an embodiment of the present invention, as shown below. Figure 8 As shown, this dynamic diagnostic method includes:

[0105] S70: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed.

[0106] S71. When the power generation is constant within a preset time, if no fault torque limiting signal is received, determine whether the coupling bolts are abnormal based on the power generation, actual engine speed, actual generator speed, generator set speed, and preset power generation-speed deviation correspondence.

[0107] Among them, the fault torque limiting signal can be a torque limiting signal input by an engine or generator fault. When an engine or generator fault causes torque limiting, it will also affect the actual engine speed and the actual generator speed. This situation will affect the judgment of the dynamic diagnostic method. Therefore, before performing dynamic diagnosis, it is necessary to first determine whether a fault torque limiting signal is received. If no fault torque limiting signal is received, it means that there is no engine or generator fault torque limiting at this time, and then dynamic diagnosis can continue.

[0108] S72. When the coupling bolts are abnormal, the coupling shall be inspected and repaired.

[0109] The technical solution of this invention performs dynamic diagnosis only when no fault torque limiting signal is received, thereby eliminating the problem of engine or generator fault torque limiting and improving the accuracy and reliability of the dynamic diagnosis method.

[0110] Based on the same inventive concept. Figure 9 This is a connection diagram of a diagnostic device for coupling malfunctions according to an embodiment of the present invention, as shown in the diagram. Figure 9 As shown, this embodiment of the invention provides a diagnostic device for coupling malfunctions, used to perform a dynamic diagnostic method for coupling malfunctions. The diagnostic device includes:

[0111] The parameter acquisition module 100 is used to acquire the generator power of the range extender, the actual speed of the engine, the actual speed of the generator, and the set speed of the generator.

[0112] The anomaly detection module 200 is used to determine whether the coupling bolts are abnormal when the power generation is constant within a preset time, based on the power generation, actual engine speed, actual generator speed, generator set speed, and preset power generation-speed deviation correspondence.

[0113] The maintenance module 300 is used to inspect the coupling when the coupling bolts are abnormal.

[0114] The coupling malfunction diagnostic device provided in this embodiment of the invention can be used to execute any of the dynamic diagnostic methods for coupling malfunctions provided in the above embodiments, and has corresponding functional modules and the same technical effects, which will not be repeated here.

[0115] Based on the same inventive concept, embodiments of the present invention also provide a computer device. Figure 10 This is a schematic diagram of an electronic device structure for a dynamic diagnostic method for coupling malfunctions according to an embodiment of the present invention, as shown below. 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 dynamic diagnostic method for coupling malfunctions.

[0116] The term "electronic device" 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. Electronic devices can also refer to various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches), 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.

[0117] like Figure 10As shown, the electronic device 50 includes at least one processor 51 and a memory, such as a read-only memory 52 or 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 can also store various programs and data required for the operation of the electronic 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.

[0118] Multiple components in electronic 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 electronic device 50 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0119] 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 dynamic diagnostic methods applied to coupling anomalies.

[0120] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a dynamic diagnostic method for coupling malfunctions.

[0121] 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, but can also execute related operations in the dynamic diagnosis method for coupling abnormalities provided in any embodiment of the present invention. (Continue to refer to...) Figure 10As 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 mounted on electronic 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 dynamic diagnostic method for coupling malfunctions described above may be performed. Alternatively, in other embodiments, processor 51 may be configured by any other suitable means (e.g., by means of firmware) to perform the dynamic diagnostic method for coupling malfunctions.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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 dynamic diagnostic method for coupling malfunctions, characterized in that, include: Obtain the range extender's power output, actual engine speed, actual generator speed, and set generator speed; When the power generation is constant within a preset time, the coupling bolts are judged to be abnormal based on the power generation, the actual speed of the engine, the actual speed of the generator, the set speed of the generator, and the preset power generation-speed deviation correspondence. Determining whether the coupling bolts are abnormal based on the power generation, actual engine speed, actual generator speed, set generator speed, and the preset power generation-speed deviation correspondence includes: A first speed deviation is calculated based on the actual engine speed and the set generator speed; a second speed deviation is calculated based on the actual generator speed and the set generator speed; and a third speed deviation is calculated based on the actual engine speed and the actual generator speed. The coupling bolts are judged to be abnormal based on the power generation, the first speed deviation, the second speed deviation, the third speed deviation, and the preset power generation-speed deviation correspondence; wherein, the preset power generation-speed deviation includes the first speed deviation threshold, the second speed deviation threshold, and the third speed deviation threshold corresponding to the power generation. When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolt is determined to be abnormal, and the coupling is repaired.

2. The dynamic diagnostic method according to claim 1, characterized in that, When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling bolt is determined to be abnormal, including: When the number of abnormalities reaches a preset number, the coupling bolt is determined to be abnormal; wherein, the number of abnormalities is the cumulative number of times when the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold.

3. The dynamic diagnostic method according to claim 1, characterized in that, When the power generation is constant within a preset time, after determining whether the coupling bolts are abnormal based on the power generation, the actual engine speed, the actual generator speed, the generator set speed, and the preset power generation-speed deviation correspondence, the process further includes: When the second speed deviation is less than the second speed deviation threshold, the first speed deviation is less than the first speed deviation threshold, and the third speed deviation is less than the third speed deviation threshold, the coupling bolt is determined to be normal. When the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling is determined to be abnormal and the coupling is repaired.

4. The dynamic diagnostic method according to claim 3, characterized in that, When the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold, the coupling is determined to be abnormal, including: When the duration of the abnormality exceeds a set abnormal time threshold, the coupling is determined to be abnormal; wherein, the duration of the abnormality is the duration during which the second speed deviation is greater than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold.

5. The dynamic diagnostic method according to claim 1, characterized in that, Determining whether the coupling bolts are abnormal based on the power generation, actual engine speed, actual generator speed, set generator speed, and preset power generation-speed deviation correspondence includes: When no fault torque limiting signal is received, the coupling bolts are judged to be abnormal based on the power generation, the actual engine speed, the actual generator speed, the generator set speed, and the preset power generation-speed deviation correspondence.

6. A diagnostic device for coupling malfunctions, characterized in that, A dynamic diagnostic method for performing any one of claims 1-5 of a coupling malfunction, the diagnostic device comprising: The parameter acquisition module is used to acquire the range extender's power generation, actual engine speed, actual generator speed, and set generator speed. An anomaly detection module is used to calculate a first speed deviation based on the actual engine speed and the set generator speed, a second speed deviation based on the actual generator speed and the set generator speed, and a third speed deviation based on the actual engine speed and the actual generator speed; and to determine whether the coupling bolts are abnormal based on the power generation, the first speed deviation, the second speed deviation, the third speed deviation, and a preset power generation-speed deviation correspondence; wherein, the preset power generation-speed deviation includes a first speed deviation threshold, a second speed deviation threshold, and a third speed deviation threshold corresponding to the power generation. The maintenance module is used to determine that the coupling bolts are abnormal and to perform maintenance on the coupling when the second speed deviation is less than the second speed deviation threshold, the first speed deviation is greater than the first speed deviation threshold, and the third speed deviation is greater than the third speed deviation threshold.

7. An electronic 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 dynamic diagnostic method as described in any one of claims 1-5.

8. 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 dynamic diagnostic method as described in any one of claims 1-5.

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