A fan fault diagnosis method and system applied to a construction machine

Abstract

This invention relates to the field of mechanical equipment maintenance technology, specifically to a method and system for diagnosing fan faults in construction machinery. The construction machinery is equipped with a controller and at least one electronic fan. The controller sends a fan speed control signal to the electronic fan. The method includes: acquiring speed status information fed back by the electronic fan according to the fan speed control signal; acquiring the operating voltage and current information of the electronic fan; and performing fan fault diagnosis based on the speed status information and the operating voltage and current information to obtain a fault diagnosis result. By acquiring the speed status information and operating voltage and current information of the electronic fan, a comprehensive fault diagnosis of the electronic fan is performed based on the operating voltage, operating current, and fan speed, thereby improving the accuracy of fan fault diagnosis.

Description

Technical Field

[0001] This invention belongs to the field of mechanical equipment maintenance technology, specifically relating to a method and system for diagnosing fan faults in engineering machinery. Background Technology

[0002] As a key component for heat dissipation in construction machinery, the fan's noise is one of the main noise sources of the entire machine, and its power consumption can account for 10%-15% of the engine power. Therefore, it is a crucial component for achieving noise reduction and energy saving in construction machinery. Consequently, most construction machinery has begun to use electric fans to replace the traditional engine-driven fans, thereby achieving better noise reduction. Currently, fault diagnosis of electric fans is mainly performed by detecting whether each fan sends fault signals through the controller.

[0003] However, in practice, it has been found that traditional fan fault diagnosis methods can usually only diagnose drive-related faults such as undervoltage, overvoltage, and overcurrent, and cannot effectively diagnose faults such as fan speed being lower than the set speed or fan stopping due to circuit breakage. The accuracy of fault diagnosis is not high.

[0004] Therefore, improving the accuracy of fan fault diagnosis is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a fan fault diagnosis method and system for engineering machinery, aiming to improve the accuracy of fan fault diagnosis.

[0006] To address the aforementioned technical problems, the first aspect of this invention discloses a fan fault diagnosis method applied to construction machinery. The construction machinery is equipped with a controller and at least one electronic fan. The controller is used to send a fan speed control signal to the electronic fan. The method includes: Obtain the speed status information of the electronic fan based on the fan speed control signal; Obtain the operating voltage and current information of the electronic fan; Fan fault diagnosis is performed based on the speed status information and the operating voltage and current information to obtain the fault diagnosis result.

[0007] As an optional implementation, in the first aspect of the present invention, the electronic fan is provided with a speed deviation detection module, and the controller is provided with a fan diagnostic port; The speed deviation detection module is used to send speed deviation fault information, which indicates that the electronic fan has a speed fault, to the controller when the deviation between the current fan speed of the electronic fan and the target fan speed corresponding to the fan speed control signal is greater than a preset speed deviation threshold. The fan diagnostic port is used to receive the speed deviation fault information; The speed status information includes the speed deviation fault information.

[0008] As an optional implementation, in the first aspect of the present invention, the step of performing fan fault diagnosis based on the speed state information and the operating voltage and current information to obtain a fault diagnosis result includes: Based on the operating voltage and current information, the electronic fan is judged to be normal in terms of voltage and current, and a normal voltage and current judgment result is obtained. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan is abnormal, and the speed deviation fault information is empty, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and operating current of the electronic fan are both normal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0009] As an optional implementation, in the first aspect of the present invention, the electronic fan is provided with a speed sensor, the speed sensor being used to collect the current fan speed of the electronic fan, and the speed status information including the current fan speed of the electronic fan; The step of performing fan fault diagnosis based on the speed status information and the operating voltage and current information to obtain fault diagnosis results includes: Based on the current fan speed, a speed deviation analysis is performed on the electronic fan to obtain the speed deviation analysis results; Based on the speed deviation analysis results and the operating voltage and current information, fan fault diagnosis is performed to obtain fault diagnosis results; The speed status information includes the speed deviation analysis results.

[0010] As an optional implementation, in the first aspect of the present invention, the step of performing speed deviation analysis on the electronic fan based on the current fan speed to obtain speed deviation analysis results includes: The target fan speed of the electronic fan is determined based on the fan speed control signal; Calculate the difference between the current fan speed and the target fan speed and take the absolute value to obtain the fan speed difference; If the fan speed difference is less than or equal to a preset speed deviation threshold, a speed deviation analysis result is generated indicating that the electronic fan does not have a speed fault. If the fan speed difference is greater than a preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan has a speed fault.

[0011] As an optional implementation, in the first aspect of the present invention, the step of performing fan fault diagnosis based on the speed deviation analysis result and the operating voltage and current information to obtain a fault diagnosis result includes: Based on the operating voltage and current information, the electronic fan is judged to be normal in terms of voltage and current, and a normal voltage and current judgment result is obtained. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan does not have a speed fault, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and operating current of the electronic fan are normal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normality determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0012] As an optional implementation, in the first aspect of the present invention, the engineering machinery is further provided with a display screen; After performing fan fault diagnosis based on the speed status information and the operating voltage and current information, and obtaining the fault diagnosis result, the method further includes: If the fault diagnosis result indicates that the electronic fan has a first type of fault, then the first fault alarm information corresponding to the electronic fan is displayed on the display screen; If the fault diagnosis result indicates that the electronic fan has a second type of fault, then the second fault alarm information corresponding to the electronic fan is displayed on the display screen; If the fault diagnosis result indicates that the electronic fan has a third type of fault, then the corresponding third fault alarm information of the electronic fan will be displayed on the display screen.

[0013] A second aspect of this invention discloses a fan fault diagnosis system for construction machinery, wherein the construction machinery is equipped with a controller and at least one electronic fan, the controller being used to send a fan speed control signal to the electronic fan, and the system comprising: The first information acquisition module is used to acquire the speed status information fed back by the electronic fan according to the fan speed control signal; The second information acquisition module is used to acquire the operating voltage and current information of the electronic fan. The fault diagnosis module is used to perform fan fault diagnosis based on the speed status information and the operating voltage and current information, and obtain the fault diagnosis result.

[0014] As an optional implementation, in a second aspect of the present invention, the electronic fan is provided with a speed deviation detection module, and the controller is provided with a fan diagnostic port; The speed deviation detection module is used to send speed deviation fault information, which indicates that the electronic fan has a speed fault, to the controller when the deviation between the current fan speed of the electronic fan and the target fan speed corresponding to the fan speed control signal is greater than a preset speed deviation threshold. The fan diagnostic port is used to receive the speed deviation fault information; The speed status information includes the speed deviation fault information.

[0015] As an optional implementation, in a second aspect of the present invention, the fault diagnosis module performs fan fault diagnosis based on the speed status information and the operating voltage and current information, and the specific method for obtaining the fault diagnosis result includes: Based on the operating voltage and current information, the electronic fan is judged to be normal in terms of voltage and current, and a normal voltage and current judgment result is obtained. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan is abnormal, and the speed deviation fault information is empty, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and operating current of the electronic fan are both normal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0016] As an optional implementation, in a second aspect of the present invention, the electronic fan is provided with a speed sensor, the speed sensor being used to collect the current fan speed of the electronic fan, and the speed status information including the current fan speed of the electronic fan; The fault diagnosis module performs fan fault diagnosis based on the speed status information and the operating voltage and current information, and the specific methods for obtaining the fault diagnosis results include: Based on the current fan speed, a speed deviation analysis is performed on the electronic fan to obtain the speed deviation analysis results; Based on the speed deviation analysis results and the operating voltage and current information, fan fault diagnosis is performed to obtain fault diagnosis results; The speed status information includes the speed deviation analysis results.

[0017] As an optional implementation, in a second aspect of the present invention, the fault diagnosis module performs a speed deviation analysis on the electronic fan based on the current fan speed, and the specific method for obtaining the speed deviation analysis result includes: The target fan speed of the electronic fan is determined based on the fan speed control signal; Calculate the difference between the current fan speed and the target fan speed and take the absolute value to obtain the fan speed difference; If the fan speed difference is less than or equal to a preset speed deviation threshold, a speed deviation analysis result is generated indicating that the electronic fan does not have a speed fault. If the fan speed difference is greater than a preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan has a speed fault.

[0018] As an optional implementation, in a second aspect of the present invention, the fault diagnosis module performs fan fault diagnosis based on the speed deviation analysis results and the operating voltage and current information, and the specific method for obtaining the fault diagnosis results includes: Based on the operating voltage and current information, the electronic fan is judged to be normal in terms of voltage and current, and a normal voltage and current judgment result is obtained. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan does not have a speed fault, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and operating current of the electronic fan are normal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normality determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0019] As an optional implementation, in a second aspect of the invention, the engineering machinery is further provided with a display screen; The system also includes: The first alarm module is used to display the first fault alarm information corresponding to the electronic fan through the display screen if the fault diagnosis result indicates that the electronic fan has a first type of fault after the fault diagnosis module performs fan fault diagnosis based on the speed status information and the working voltage and current information. The second alarm module is used to display the second fault alarm information corresponding to the electronic fan through the display screen if the fault diagnosis result indicates that the electronic fan has a second type of fault after the fault diagnosis module performs fan fault diagnosis based on the speed status information and the working voltage and current information. The third alarm module is used to display the corresponding third fault alarm information of the electronic fan on the display screen if the fault diagnosis result indicates that the electronic fan has a third type of fault after the fault diagnosis module performs fan fault diagnosis based on the speed status information and the working voltage and current information.

[0020] A third aspect of the present invention discloses another fan fault diagnosis system for engineering machinery, the device comprising: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute a fan fault diagnosis method for engineering machinery disclosed in the first aspect of the present invention.

[0021] The fourth aspect of the present invention discloses a computer storage medium storing computer instructions, which, when invoked by a processor, are used to execute a fan fault diagnosis method for engineering machinery disclosed in the first aspect of the present invention.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: After the controller sends a fan speed control signal to the electric fan, it acquires the fan speed status information fed back by the control signal, as well as the fan's operating voltage and current information. Based on this information, fan fault diagnosis is performed to obtain the diagnosis results. By acquiring the fan speed status and operating voltage / current information, a comprehensive fault diagnosis is conducted based on the operating voltage, operating current, and fan speed, thereby improving the accuracy of fan fault diagnosis. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0024] Figure 1 This invention discloses a fan fault diagnosis method for engineering machinery. Figure 2 This is a schematic diagram of the structure of a fan cooling system for engineering machinery disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a fan fault diagnosis system for engineering machinery disclosed in an embodiment of the present invention; Figure 4 This is a schematic diagram of another fan fault diagnosis system for engineering machinery disclosed in an embodiment of the present invention; Figure 5 This is a schematic diagram of another fan fault diagnosis system for engineering machinery disclosed in an embodiment of the present invention. Detailed Implementation

[0025] 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 are within the scope of protection of the present invention.

[0026] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, or product may include a series of steps or units, or may not be limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or processes.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] As a key component for heat dissipation in construction machinery, the fan's noise is one of the main noise sources of the entire machine, and its power consumption can account for 10%-15% of the engine power. Therefore, it is a crucial component for achieving noise reduction and energy saving in construction machinery. Consequently, most construction machinery has begun to use electric fans to replace the traditional engine-driven fans, thereby achieving better noise reduction. Currently, fault diagnosis of electric fans is mainly performed by detecting whether each fan sends fault signals through the controller.

[0029] However, in practice, it has been found that traditional fan fault diagnosis methods can usually only diagnose drive-related faults such as undervoltage, overvoltage, and overcurrent, and cannot effectively diagnose faults such as fan speed being lower than the set speed or fan stopping due to circuit breakage. The accuracy of fault diagnosis is not high.

[0030] Therefore, improving the accuracy of fan fault diagnosis is a technical problem that urgently needs to be solved.

[0031] To address the aforementioned technical problems, this invention discloses a fan fault diagnosis method and system for engineering machinery, aiming to improve the accuracy of fan fault diagnosis. Detailed descriptions follow.

[0032] Example 1 Please see Figure 1 , Figure 1 This invention discloses a fan fault diagnosis method for engineering machinery. Figure 1 The method shown can be applied to a fan fault diagnosis system, which can improve the accuracy of fan fault diagnosis. Construction machinery is equipped with a controller and at least one electric fan. The controller sends fan speed control signals to the electric fan, such as... Figure 1As shown, the fan fault diagnosis method for engineering machinery disclosed in this embodiment of the invention includes, but is not limited to, the following operations: 101. Obtain the speed status information of the electronic fan based on the fan speed control signal; 102. Obtain the operating voltage and current information of the electronic fan; 103. Perform fan fault diagnosis based on speed status information and operating voltage and current information to obtain fault diagnosis results.

[0033] In this embodiment of the invention, after the controller sends a fan speed control signal to the electric fan, it acquires the fan speed status information fed back by the fan speed control signal, and also acquires the operating voltage and current information of the electric fan. Based on the fan speed status information and the operating voltage and current information, fan fault diagnosis is performed to obtain the fault diagnosis result. By acquiring the fan speed status information and operating voltage and current information, a comprehensive fault diagnosis of the electric fan is performed based on the operating voltage, operating current, and fan speed, thereby improving the accuracy of fan fault diagnosis.

[0034] In an optional embodiment, the electric fan is provided with a speed deviation detection module, and the controller is provided with a fan diagnostic port; The speed deviation detection module is used to send speed deviation fault information, which indicates that there is a speed fault in the electronic fan, to the controller when the deviation between the current fan speed of the electronic fan and the target fan speed corresponding to the fan speed control signal is greater than a preset speed deviation threshold. The fan diagnostic port is used to receive speed deviation fault information; The speed status information includes speed deviation fault information.

[0035] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a fan cooling system for engineering machinery disclosed in one embodiment of the present invention. Figure 2 As shown, the fan cooling system of the construction machinery includes: a power supply (1), a smart fuse (2), a display (3), a controller (4), an electric fan (5), and an electric fan (6). Compared with traditional electric fans, both electric fans are equipped with a speed deviation detection module. It should be noted that the number of electric fans can be set according to the cooling requirements. Figure 2 Take two electric fans as an example. A smart fuse can detect the fan current and voltage; if the voltage or current is abnormal, it can cut off the power. Multiple electric fans share a single line to send signals to the controller's diagnostic port.

[0036] The intelligent safety device integrates voltage and current sampling circuits. The voltage sampling circuit collects the operating voltage value of the electric fan in real time, while the current sampling circuit collects the operating current value. The device also includes a comparator circuit that compares the collected operating voltage value with a preset upper voltage threshold and a preset lower voltage threshold, and simultaneously compares the collected operating current value with a preset upper current threshold and a preset lower current threshold. When the operating voltage exceeds the upper voltage threshold or falls below the lower voltage threshold, the intelligent safety device automatically cuts off the power supply to the electric fan and sends a voltage anomaly interruption signal to the controller. Similarly, when the operating current exceeds the upper current threshold or falls below the lower current threshold, the intelligent safety device automatically cuts off the power supply to the electric fan and sends a current anomaly interruption signal to the controller. The controller uses the received voltage and current anomaly interruption signals, combined with the fan speed status information, to perform fault diagnosis. This intelligent safety device enables real-time monitoring and protection of voltage and current, allowing for timely power cut-off in the early stages of a fault to prevent escalation and providing reliable voltage and current status information for fault diagnosis.

[0037] In another optional embodiment, fan fault diagnosis is performed based on speed status information and operating voltage and current information to obtain fault diagnosis results, including: Based on the operating voltage and current information, the voltage and current of the electronic fan are judged to be normal, and the normal voltage and current judgment result is obtained. If the voltage and current normal judgment result indicates that the working voltage and / or working current of the electric fan are abnormal, and the speed deviation fault information is empty, then a fault diagnosis result indicating that the electric fan has a first type of fault is generated. If the voltage and current normal judgment result indicates that the working voltage and working current of the electronic fan are normal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normal judgment result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0038] In this optional embodiment, a comprehensive fault diagnosis is performed based on the operating voltage, operating current, and speed deviation fault information generated by the electric fan's own fault detection, thereby improving the accuracy of fan fault diagnosis.

[0039] In another optional embodiment, after sending a fan speed control signal to the electric fan, the controller acquires the fan speed status information fed back by the fan speed control signal, and simultaneously acquires the operating voltage and current information of the electric fan. The controller internally includes a diagnostic timer to record the time interval between sending the fan speed control signal and receiving the speed status information. The controller determines whether this time interval exceeds a preset response time threshold. If it does, a preliminary judgment is made that the electric fan has a communication anomaly. After the preliminary judgment of a communication anomaly, the controller continues to perform comprehensive fault diagnosis based on subsequently received speed status information and operating voltage and current information. If no speed status information is received after exceeding the response time threshold, and the operating voltage and current information shows that the electric fan's operating voltage and current are both within the normal range, the controller generates a diagnostic result indicating a communication link failure in the electric fan. If no speed status information is received after exceeding the response time threshold, and the operating voltage and current information shows that the electric fan's operating voltage or operating current is abnormal, the controller generates a comprehensive fault diagnosis result indicating that the electric fan has both a power supply failure and a communication failure. By introducing a response time judgment mechanism into the fault diagnosis process, the fault types of electric fans can be further distinguished, thereby improving the precision and accuracy of fault diagnosis.

[0040] In another optional embodiment, the controller includes a fault diagnosis state machine comprising multiple diagnostic states, including an idle state, a speed information acquisition state, a voltage and current information acquisition state, a first type of fault determination state, a second type of fault determination state, a third type of fault determination state, and a result output state. After the controller sends a fan speed control signal to the electric fan, the fault diagnosis state machine transitions from the idle state to the speed information acquisition state, where the controller waits to receive speed status information from the electric fan. Upon receiving the speed status information, the fault diagnosis state machine transitions to the voltage and current information acquisition state, where the controller reads the operating voltage and current information reported by the intelligent safety device. After the voltage and current information acquisition is complete, the fault diagnosis state machine transitions to the corresponding fault determination state based on the speed status information and the voltage and current information. If the speed status information is empty and the voltage and current information is abnormal, it transitions to the first type of fault determination state. If the speed status information indicates a speed fault and the voltage and current information is normal, it transitions to the second type of fault determination state. If the speed status information indicates a speed fault and the voltage and current information is abnormal, it transitions to the third type of fault determination state. In the corresponding fault determination state, the controller further confirms the fault type and generates the corresponding fault diagnosis result, then jumps to the result output state to output the fault diagnosis result to the display screen. By introducing a fault diagnosis state machine, the fault diagnosis process becomes standardized and modularized, facilitating software implementation and subsequent functional expansion.

[0041] In another optional embodiment, the construction machinery is equipped with multiple electronic fans, which share a single diagnostic signal line connected to the controller's fan diagnostic port. Each electronic fan has an internal speed deviation detection module. When each speed deviation detection module detects a speed deviation fault in its corresponding electronic fan, it generates a speed deviation fault message. To prevent signal conflicts caused by multiple electronic fans simultaneously sending speed deviation fault messages, each speed deviation detection module has a unique fan identifier code, and each module executes a carrier sense multiple access (CSM) mechanism before sending the speed deviation fault message. Specifically, when a speed deviation fault message needs to be sent, the speed deviation detection module first listens to whether the diagnostic signal line is idle. If the diagnostic signal line is idle, it immediately begins sending the speed deviation fault message containing the fan identifier code. If the diagnostic signal line is busy, it waits for a random backoff time before attempting to send again. After receiving the speed deviation fault message, the controller identifies which electronic fan has experienced a speed deviation fault based on the fan identifier code contained in the message. By introducing the carrier sense multiple access mechanism, the signal conflict problem when multiple electronic fans share a single diagnostic signal line is solved, reducing the system wiring complexity.

[0042] In another optional embodiment, the electric fan is provided with a speed sensor, which is used to collect the current fan speed of the electric fan, and the speed status information includes the current fan speed of the electric fan; Fan fault diagnosis is performed based on speed status information and operating voltage and current information to obtain fault diagnosis results, including: Based on the current fan speed, a speed deviation analysis of the electronic fan is performed to obtain the speed deviation analysis results. Based on the speed deviation analysis results and the operating voltage and current information, fan fault diagnosis is performed to obtain the fault diagnosis results. The speed status information includes the speed deviation analysis results.

[0043] In another optional embodiment, a speed deviation analysis is performed on the electric fan based on the current fan speed to obtain the speed deviation analysis results, including: The target fan speed of the electronic fan is determined based on the fan speed control signal; Calculate the difference between the current fan speed and the target fan speed and take the absolute value to obtain the fan speed difference; If the fan speed difference is less than or equal to the preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan does not have a speed fault. If the fan speed difference is greater than the preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan has a speed fault.

[0044] In another optional embodiment, fan fault diagnosis is performed based on the speed deviation analysis results and operating voltage and current information to obtain fault diagnosis results, including: Based on the operating voltage and current information, the voltage and current of the electronic fan are judged to be normal, and the normal voltage and current judgment result is obtained. If the voltage and current normal judgment result indicates that the working voltage and / or working current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan does not have a speed fault, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal judgment result indicates that the working voltage and working current of the electronic fan are normal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normality judgment result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0045] In this optional embodiment, a comprehensive fault diagnosis is performed based on the operating voltage, operating current, and the speed deviation analysis results generated by the deviation analysis of the real-time speed of the electric fan, thereby improving the accuracy of fan fault diagnosis.

[0046] In another optional embodiment, a fault counting mechanism is introduced during the fan fault diagnosis process based on the speed status information and operating voltage and current information. Specifically, the controller is equipped with a first-type fault counter, a second-type fault counter, and a third-type fault counter. In each diagnostic cycle, the controller generates a temporary diagnostic result based on the current speed status information and operating voltage and current information. If the temporary diagnostic results consistently indicate a first-type fault, the first-type fault counter is incremented. When the count value of the first-type fault counter reaches a preset confirmation threshold, the controller finally confirms that the electric fan has a first-type fault and generates a formal first-type fault diagnosis result. If the temporary diagnostic results are inconsistent across multiple consecutive diagnoses, the first-type fault counter is reset to zero. Similarly, the second-type and third-type fault counters are used for the confirmation of second-type and third-type faults, respectively. By introducing a fault counting mechanism, a fault is only finally confirmed when multiple consecutive diagnoses point to the same fault type, effectively avoiding false alarms caused by single-diagnosis errors and improving the reliability of the fault diagnosis results.

[0047] In yet another optional embodiment, the construction machinery is also equipped with a display screen; Based on the fan speed status information and operating voltage and current information, the method performs fan fault diagnosis. After obtaining the fault diagnosis results, the method also includes: If the fault diagnosis result indicates that the electronic fan has a first type of fault, the corresponding first fault alarm information of the electronic fan will be displayed on the screen. If the fault diagnosis result indicates that the electronic fan has a second type of fault, the corresponding second fault alarm information of the electronic fan will be displayed on the screen. If the fault diagnosis result indicates that the electric fan has a third type of fault, the corresponding third fault alarm information of the electric fan will be displayed on the screen.

[0048] In this optional embodiment, alarms are triggered in a corresponding manner based on different types of fault diagnosis results, thereby reminding the construction machinery operators to perform maintenance.

[0049] In another optional embodiment, the display screen of the construction machinery is a touch screen. While displaying fault alarm information on the screen, the controller also generates a fault confirmation button and a fault reset button on the touch screen. When the construction machinery operator sees the fault alarm information, they can send a fault confirmation signal to the controller by touching the fault confirmation button. Upon receiving the fault confirmation signal, the controller switches the display status of the fault alarm information from flashing to constant illumination. After the maintenance personnel complete the troubleshooting, they can send a fault reset signal to the controller by touching the fault reset button. Upon receiving the fault reset signal, the controller clears the corresponding fault alarm information and restarts the fan fault diagnosis process. In addition, a fault details viewing button is also generated on the touch screen. After the operator touches this button, the display shows detailed information about the fault diagnosis results, including the identifier of the faulty electric fan, the fault type, the time of the fault, the operating voltage value, the operating current value, and the fan speed value at the time of the fault. By providing interactive buttons and fault details viewing functions on the touch screen, operators and maintenance personnel can easily understand the fault situation and take appropriate action, improving the convenience of human-machine interaction.

[0050] In another optional embodiment, after generating the fault diagnosis results, the controller also stores the results in a local fault log storage device. The local fault log storage device uses a non-volatile storage medium, ensuring that the fault log information is not lost even after the construction machinery is powered off. Each fault log record stored in the local fault log storage device includes the fault occurrence time, fault type, faulty electronic fan identifier, operating voltage value, operating current value, target fan speed value, actual fan speed value, and ambient temperature value at the time of the fault occurrence. The controller connects to an external diagnostic device via a maintenance interface. When the external diagnostic device is connected to the maintenance interface, the controller sends the fault log records stored in the local fault log storage device to the external diagnostic device through the maintenance interface. After receiving the fault log records, maintenance personnel can view historical fault information and analyze the patterns and causes of fault occurrences through the external diagnostic device. By setting up a local fault log storage device and a maintenance interface, maintenance personnel can easily trace and analyze historical faults on-site, improving the efficiency of fault diagnosis.

[0051] Example 2 Please see Figure 3 , Figure 3 This is a schematic diagram of a fan fault diagnosis system for construction machinery disclosed in an embodiment of the present invention. The construction machinery is equipped with a controller and at least one electronic fan. The controller is used to send fan speed control signals to the electronic fan, such as... Figure 3As shown, an embodiment of the present invention discloses a fan fault diagnosis system for engineering machinery, including but not limited to: The first information acquisition module 201 is used to acquire the speed status information fed back by the electronic fan according to the fan speed control signal; The second information acquisition module 202 is used to acquire the operating voltage and current information of the electronic fan; The fault diagnosis module 203 is used to perform fan fault diagnosis based on the speed status information and the operating voltage and current information, and obtain the fault diagnosis results.

[0052] In this embodiment of the invention, after the controller sends a fan speed control signal to the electric fan, it acquires the fan speed status information fed back by the fan speed control signal, and also acquires the operating voltage and current information of the electric fan. Based on the fan speed status information and the operating voltage and current information, fan fault diagnosis is performed to obtain the fault diagnosis result. By acquiring the fan speed status information and operating voltage and current information, a comprehensive fault diagnosis of the electric fan is performed based on the operating voltage, operating current, and fan speed, thereby improving the accuracy of fan fault diagnosis.

[0053] In an optional embodiment, the electric fan is provided with a speed deviation detection module, and the controller is provided with a fan diagnostic port; The speed deviation detection module is used to send speed deviation fault information, which indicates that there is a speed fault in the electronic fan, to the controller when the deviation between the current fan speed of the electronic fan and the target fan speed corresponding to the fan speed control signal is greater than a preset speed deviation threshold. The fan diagnostic port is used to receive speed deviation fault information; The speed status information includes speed deviation fault information.

[0054] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a fan cooling system for engineering machinery disclosed in one embodiment of the present invention. Figure 2 As shown, the fan cooling system of the construction machinery includes: a power supply (1), a smart fuse (2), a display (3), a controller (4), an electric fan (5), and an electric fan (6). Compared with traditional electric fans, both electric fans are equipped with a speed deviation detection module. It should be noted that the number of electric fans can be set according to the cooling requirements. Figure 2 Take two electric fans as an example. A smart fuse can detect the fan current and voltage; if the voltage or current is abnormal, it can cut off the power. Multiple electric fans share a single line to send signals to the controller's diagnostic port.

[0055] The intelligent safety device integrates voltage and current sampling circuits. The voltage sampling circuit collects the operating voltage value of the electric fan in real time, while the current sampling circuit collects the operating current value. The device also includes a comparator circuit that compares the collected operating voltage value with a preset upper voltage threshold and a preset lower voltage threshold, and simultaneously compares the collected operating current value with a preset upper current threshold and a preset lower current threshold. When the operating voltage exceeds the upper voltage threshold or falls below the lower voltage threshold, the intelligent safety device automatically cuts off the power supply to the electric fan and sends a voltage anomaly interruption signal to the controller. Similarly, when the operating current exceeds the upper current threshold or falls below the lower current threshold, the intelligent safety device automatically cuts off the power supply to the electric fan and sends a current anomaly interruption signal to the controller. The controller uses the received voltage and current anomaly interruption signals, combined with the fan speed status information, to perform fault diagnosis. This intelligent safety device enables real-time monitoring and protection of voltage and current, allowing for timely power cut-off in the early stages of a fault to prevent escalation and providing reliable voltage and current status information for fault diagnosis.

[0056] In another optional embodiment, the fault diagnosis module 203 performs fan fault diagnosis based on the speed status information and operating voltage and current information, and the specific method for obtaining the fault diagnosis result includes: Based on the operating voltage and current information, the voltage and current of the electronic fan are judged to be normal, and the normal voltage and current judgment result is obtained. If the voltage and current normal judgment result indicates that the working voltage and / or working current of the electric fan are abnormal, and the speed deviation fault information is empty, then a fault diagnosis result indicating that the electric fan has a first type of fault is generated. If the voltage and current normal judgment result indicates that the working voltage and working current of the electronic fan are normal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normal judgment result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0057] In this optional embodiment, a comprehensive fault diagnosis is performed based on the operating voltage, operating current, and speed deviation fault information generated by the electric fan's own fault detection, thereby improving the accuracy of fan fault diagnosis.

[0058] In another optional embodiment, after sending a fan speed control signal to the electric fan, the controller acquires the fan speed status information fed back by the fan speed control signal, and simultaneously acquires the operating voltage and current information of the electric fan. The controller internally includes a diagnostic timer to record the time interval between sending the fan speed control signal and receiving the speed status information. The controller determines whether this time interval exceeds a preset response time threshold. If it does, a preliminary judgment is made that the electric fan has a communication anomaly. After the preliminary judgment of a communication anomaly, the controller continues to perform comprehensive fault diagnosis based on subsequently received speed status information and operating voltage and current information. If no speed status information is received after exceeding the response time threshold, and the operating voltage and current information shows that the electric fan's operating voltage and current are both within the normal range, the controller generates a diagnostic result indicating a communication link failure in the electric fan. If no speed status information is received after exceeding the response time threshold, and the operating voltage and current information shows that the electric fan's operating voltage or operating current is abnormal, the controller generates a comprehensive fault diagnosis result indicating that the electric fan has both a power supply failure and a communication failure. By introducing a response time judgment mechanism into the fault diagnosis process, the fault types of electric fans can be further distinguished, thereby improving the precision and accuracy of fault diagnosis.

[0059] In another optional embodiment, the controller includes a fault diagnosis state machine comprising multiple diagnostic states, including an idle state, a speed information acquisition state, a voltage and current information acquisition state, a first type of fault determination state, a second type of fault determination state, a third type of fault determination state, and a result output state. After the controller sends a fan speed control signal to the electric fan, the fault diagnosis state machine transitions from the idle state to the speed information acquisition state, where the controller waits to receive speed status information from the electric fan. Upon receiving the speed status information, the fault diagnosis state machine transitions to the voltage and current information acquisition state, where the controller reads the operating voltage and current information reported by the intelligent safety device. After the voltage and current information acquisition is complete, the fault diagnosis state machine transitions to the corresponding fault determination state based on the speed status information and the voltage and current information. If the speed status information is empty and the voltage and current information is abnormal, it transitions to the first type of fault determination state. If the speed status information indicates a speed fault and the voltage and current information is normal, it transitions to the second type of fault determination state. If the speed status information indicates a speed fault and the voltage and current information is abnormal, it transitions to the third type of fault determination state. In the corresponding fault determination state, the controller further confirms the fault type and generates the corresponding fault diagnosis result, then jumps to the result output state to output the fault diagnosis result to the display screen. By introducing a fault diagnosis state machine, the fault diagnosis process becomes standardized and modularized, facilitating software implementation and subsequent functional expansion.

[0060] In another optional embodiment, the construction machinery is equipped with multiple electronic fans, which share a single diagnostic signal line connected to the controller's fan diagnostic port. Each electronic fan has an internal speed deviation detection module. When each speed deviation detection module detects a speed deviation fault in its corresponding electronic fan, it generates a speed deviation fault message. To prevent signal conflicts caused by multiple electronic fans simultaneously sending speed deviation fault messages, each speed deviation detection module has a unique fan identifier code, and each module executes a carrier sense multiple access (CSM) mechanism before sending the speed deviation fault message. Specifically, when a speed deviation fault message needs to be sent, the speed deviation detection module first listens to whether the diagnostic signal line is idle. If the diagnostic signal line is idle, it immediately begins sending the speed deviation fault message containing the fan identifier code. If the diagnostic signal line is busy, it waits for a random backoff time before attempting to send again. After receiving the speed deviation fault message, the controller identifies which electronic fan has experienced a speed deviation fault based on the fan identifier code contained in the message. By introducing the carrier sense multiple access mechanism, the signal conflict problem when multiple electronic fans share a single diagnostic signal line is solved, reducing the system wiring complexity.

[0061] In another optional embodiment, the electric fan is provided with a speed sensor, which is used to collect the current fan speed of the electric fan, and the speed status information includes the current fan speed of the electric fan; The fault diagnosis module 203 performs fan fault diagnosis based on the speed status information and operating voltage and current information. The specific methods for obtaining the fault diagnosis results include: Based on the current fan speed, a speed deviation analysis of the electronic fan is performed to obtain the speed deviation analysis results. Based on the speed deviation analysis results and the operating voltage and current information, fan fault diagnosis is performed to obtain the fault diagnosis results. The speed status information includes the speed deviation analysis results.

[0062] In another optional embodiment, the fault diagnosis module 203 performs a speed deviation analysis on the electric fan based on the current fan speed, and the specific method for obtaining the speed deviation analysis result includes: The target fan speed of the electronic fan is determined based on the fan speed control signal; Calculate the difference between the current fan speed and the target fan speed and take the absolute value to obtain the fan speed difference; If the fan speed difference is less than or equal to the preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan does not have a speed fault. If the fan speed difference is greater than the preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan has a speed fault.

[0063] In another optional embodiment, the fault diagnosis module 203 performs fan fault diagnosis based on the speed deviation analysis results and operating voltage and current information. The specific methods for obtaining the fault diagnosis results include: Based on the operating voltage and current information, the voltage and current of the electronic fan are judged to be normal, and the normal voltage and current judgment result is obtained. If the voltage and current normal judgment result indicates that the working voltage and / or working current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan does not have a speed fault, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal judgment result indicates that the working voltage and working current of the electronic fan are normal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normality judgment result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

[0064] In this optional embodiment, a comprehensive fault diagnosis is performed based on the operating voltage, operating current, and the speed deviation analysis results generated by the deviation analysis of the real-time speed of the electric fan, thereby improving the accuracy of fan fault diagnosis.

[0065] In another optional embodiment, a fault counting mechanism is introduced during the fan fault diagnosis process based on the speed status information and operating voltage and current information. Specifically, the controller is equipped with a first-type fault counter, a second-type fault counter, and a third-type fault counter. In each diagnostic cycle, the controller generates a temporary diagnostic result based on the current speed status information and operating voltage and current information. If the temporary diagnostic results consistently indicate a first-type fault, the first-type fault counter is incremented. When the count value of the first-type fault counter reaches a preset confirmation threshold, the controller finally confirms that the electric fan has a first-type fault and generates a formal first-type fault diagnosis result. If the temporary diagnostic results are inconsistent across multiple consecutive diagnoses, the first-type fault counter is reset to zero. Similarly, the second-type and third-type fault counters are used for the confirmation of second-type and third-type faults, respectively. By introducing a fault counting mechanism, a fault is only finally confirmed when multiple consecutive diagnoses point to the same fault type, effectively avoiding false alarms caused by single-diagnosis errors and improving the reliability of the fault diagnosis results.

[0066] In yet another optional embodiment, the construction machinery is also equipped with a display screen; Please see Figure 4 , Figure 4 This is a schematic diagram of another fan fault diagnosis system for engineering machinery disclosed in an embodiment of the present invention. Figure 4 As shown in the figure, the fan fault diagnosis system for engineering machinery disclosed in this embodiment of the invention further includes: The first alarm module 204 is used to display the first fault alarm information of the electronic fan on the display screen if the fault diagnosis result indicates that the electronic fan has a first type of fault after the fault diagnosis module 203 performs fan fault diagnosis based on the speed status information and the working voltage and current information. The second alarm module 205 is used to display the corresponding second fault alarm information of the electronic fan on the display screen if the fault diagnosis result indicates that the electronic fan has a second type of fault after the fault diagnosis module 203 performs fan fault diagnosis based on the speed status information and the working voltage and current information. The third alarm module 206 is used to perform fan fault diagnosis based on the speed status information and working voltage and current information in the fault diagnosis module 203. After obtaining the fault diagnosis result, if the fault diagnosis result indicates that the electronic fan has a third type of fault, the corresponding third fault alarm information of the electronic fan will be displayed on the display screen.

[0067] In this optional embodiment, alarms are triggered in a corresponding manner based on different types of fault diagnosis results, thereby reminding the construction machinery operators to perform maintenance.

[0068] In another optional embodiment, the display screen of the construction machinery is a touch screen. While displaying fault alarm information on the screen, the controller also generates a fault confirmation button and a fault reset button on the touch screen. When the construction machinery operator sees the fault alarm information, they can send a fault confirmation signal to the controller by touching the fault confirmation button. Upon receiving the fault confirmation signal, the controller switches the display status of the fault alarm information from flashing to constant illumination. After the maintenance personnel complete the troubleshooting, they can send a fault reset signal to the controller by touching the fault reset button. Upon receiving the fault reset signal, the controller clears the corresponding fault alarm information and restarts the fan fault diagnosis process. In addition, a fault details viewing button is also generated on the touch screen. After the operator touches this button, the display shows detailed information about the fault diagnosis results, including the identifier of the faulty electric fan, the fault type, the time of the fault, the operating voltage value, the operating current value, and the fan speed value at the time of the fault. By providing interactive buttons and fault details viewing functions on the touch screen, operators and maintenance personnel can easily understand the fault situation and take appropriate action, improving the convenience of human-machine interaction.

[0069] In another optional embodiment, after generating the fault diagnosis results, the controller also stores the results in a local fault log storage device. The local fault log storage device uses a non-volatile storage medium, ensuring that the fault log information is not lost even after the construction machinery is powered off. Each fault log record stored in the local fault log storage device includes the fault occurrence time, fault type, faulty electronic fan identifier, operating voltage value, operating current value, target fan speed value, actual fan speed value, and ambient temperature value at the time of the fault occurrence. The controller connects to an external diagnostic device via a maintenance interface. When the external diagnostic device is connected to the maintenance interface, the controller sends the fault log records stored in the local fault log storage device to the external diagnostic device through the maintenance interface. After receiving the fault log records, maintenance personnel can view historical fault information and analyze the patterns and causes of fault occurrences through the external diagnostic device. By setting up a local fault log storage device and a maintenance interface, maintenance personnel can easily trace and analyze historical faults on-site, improving the efficiency of fault diagnosis.

[0070] Example 3 Please see Figure 5 , Figure 5 This is a schematic diagram of another fan fault diagnosis system for construction machinery disclosed in an embodiment of the present invention. The construction machinery is equipped with a controller and at least one electronic fan. The controller is used to send fan speed control signals to the electronic fan, such as... Figure 5 As shown, an embodiment of the present invention discloses a fan fault diagnosis system for engineering machinery, including but not limited to: Memory 301 storing executable program code; Processor 302 coupled to memory 301; The processor 302 calls the executable program code stored in the memory 301 to execute some or all of the steps in the fan fault diagnosis method for engineering machinery described in Embodiment 1 of the present invention.

[0071] Example 4 This invention discloses a computer storage medium storing computer instructions. When the computer instructions are invoked by a processor, they are used to execute some or all of the steps in the fan fault diagnosis method for engineering machinery described in Embodiment 1 of this invention.

[0072] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules. They may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0073] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0074] Finally, it should be noted that the technical content disclosed in the embodiments of the present invention is only a preferred embodiment of the present invention and is only used to illustrate the technical solutions of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for diagnosing fan faults in engineering machinery, characterized in that, The engineering machinery is equipped with a controller and at least one electric fan. The controller is used to send a fan speed control signal to the electric fan. The method includes: Obtain the speed status information of the electronic fan based on the fan speed control signal; Obtain the operating voltage and current information of the electronic fan; Fan fault diagnosis is performed based on the speed status information and the operating voltage and current information to obtain the fault diagnosis result.

2. The fan fault diagnosis method for engineering machinery according to claim 1, characterized in that, The electronic fan is equipped with a speed deviation detection module, and the controller is equipped with a fan diagnostic port; The speed deviation detection module is used to send speed deviation fault information, which indicates that the electronic fan has a speed fault, to the controller when the deviation between the current fan speed of the electronic fan and the target fan speed corresponding to the fan speed control signal is greater than a preset speed deviation threshold. The fan diagnostic port is used to receive the speed deviation fault information; The speed status information includes the speed deviation fault information.

3. The fan fault diagnosis method for engineering machinery according to claim 2, characterized in that, The step of performing fan fault diagnosis based on the speed status information and the operating voltage and current information to obtain fault diagnosis results includes: Based on the operating voltage and current information, the electronic fan is judged to be normal in terms of voltage and current, and a normal voltage and current judgment result is obtained. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan is abnormal, and the speed deviation fault information is empty, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and operating current of the electronic fan are both normal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation fault information indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

4. The fan fault diagnosis method for engineering machinery according to claim 1, characterized in that, The electronic fan is equipped with a speed sensor, which is used to collect the current fan speed of the electronic fan. The speed status information includes the current fan speed of the electronic fan. The step of performing fan fault diagnosis based on the speed status information and the operating voltage and current information to obtain fault diagnosis results includes: Based on the current fan speed, a speed deviation analysis is performed on the electronic fan to obtain the speed deviation analysis results; Based on the speed deviation analysis results and the operating voltage and current information, fan fault diagnosis is performed to obtain fault diagnosis results; The speed status information includes the speed deviation analysis results.

5. The fan fault diagnosis method for engineering machinery according to claim 4, characterized in that, The step of performing a speed deviation analysis on the electronic fan based on the current fan speed to obtain the speed deviation analysis result includes: The target fan speed of the electronic fan is determined based on the fan speed control signal; Calculate the difference between the current fan speed and the target fan speed and take the absolute value to obtain the fan speed difference; If the fan speed difference is less than or equal to a preset speed deviation threshold, a speed deviation analysis result is generated indicating that the electronic fan does not have a speed fault. If the fan speed difference is greater than a preset speed deviation threshold, a speed deviation analysis result is generated to indicate that the electronic fan has a speed fault.

6. The fan fault diagnosis method for engineering machinery according to claim 5, characterized in that, The step of performing fan fault diagnosis based on the speed deviation analysis results and the operating voltage and current information to obtain fault diagnosis results includes: Based on the operating voltage and current information, the electronic fan is judged to be normal in terms of voltage and current, and a normal voltage and current judgment result is obtained. If the voltage and current normal determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan does not have a speed fault, then a fault diagnosis result indicating that the electronic fan has a first type of fault is generated. If the voltage and current normal determination result indicates that the operating voltage and operating current of the electronic fan are normal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a second type of fault is generated. If the voltage and current normality determination result indicates that the operating voltage and / or operating current of the electronic fan are abnormal, and the speed deviation analysis result indicates that the electronic fan has a speed fault, then a fault diagnosis result indicating that the electronic fan has a third type of fault is generated.

7. A fan fault diagnosis method for engineering machinery according to claim 3 or 6, characterized in that, The construction machinery is also equipped with a display screen; After performing fan fault diagnosis based on the speed status information and the operating voltage and current information, and obtaining the fault diagnosis result, the method further includes: If the fault diagnosis result indicates that the electronic fan has a first type of fault, then the first fault alarm information corresponding to the electronic fan is displayed on the display screen; If the fault diagnosis result indicates that the electronic fan has a second type of fault, then the second fault alarm information corresponding to the electronic fan is displayed on the display screen; If the fault diagnosis result indicates that the electronic fan has a third type of fault, then the corresponding third fault alarm information of the electronic fan will be displayed on the display screen.

8. A fan fault diagnosis system for engineering machinery, characterized in that, The construction machinery is equipped with a controller and at least one electric fan. The controller is used to send a fan speed control signal to the electric fan. The system includes: The first information acquisition module is used to acquire the speed status information fed back by the electronic fan according to the fan speed control signal; The second information acquisition module is used to acquire the operating voltage and current information of the electronic fan. The fault diagnosis module is used to perform fan fault diagnosis based on the speed status information and the operating voltage and current information, and obtain the fault diagnosis result.

9. A fan fault diagnosis system for engineering machinery, characterized in that, The construction machinery is equipped with a controller and at least one electric fan. The controller is used to send a fan speed control signal to the electric fan. The system includes: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the fan fault diagnosis method for engineering machinery as described in any one of claims 1 to 7.

10. A computer storage medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked by the processor, are used to execute the fan fault diagnosis method for engineering machinery as described in any one of claims 1 to 7.

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