Fan protection method, device, computer-readable storage medium and computer equipment

Abstract

The present invention discloses a fan protection method, device, computer-readable storage medium and computer equipment. Wherein, the method includes: obtaining the fan speed, fan negative pressure, engine speed and engine torque of a sanitation vehicle; determining a speed ratio coefficient based on the fan speed and the engine speed; determining the fan operating state based on the speed ratio coefficient, the fan negative pressure and the engine torque; and determining a fan protection control strategy corresponding to the fan operating state. The present invention solves the technical problem that it is difficult to timely detect faults in the fan of a sanitation vehicle and take corresponding protection measures.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitation vehicles, and in particular, to a fan protection method, device, computer-readable storage medium and computer equipment. Background Art

[0002] In the related art, the fan of a sanitation vehicle usually uses an engine to complete mechanical connection through a transmission shaft or a belt. However, due to the harsh operating environment, dust deposition will occur during the operation of the fan, resulting in deposits in the fan impeller chamber, making the fan operation stuck. When the fan starts, the fan cannot rotate, which will cause damage to the transmission shaft or belt, or it will also get stuck when the fan is operating at high speed during normal operation. The above situations will cause mechanical failures, pose a great safety hazard to the vehicle body, and at the same time affect the operation efficiency of the sanitation vehicle.

[0003] Therefore, in the related art, there is a technical problem that it is difficult to detect the failure of the fan in the sanitation vehicle in time and take corresponding protection measures.

[0004] In view of the above problems, no effective solution has been proposed yet. Summary of the Invention

[0005] Embodiments of the present invention provide a fan protection method, device, computer-readable storage medium and computer equipment, so as to at least solve the technical problem of being difficult to detect the failure of the fan in the sanitation vehicle in time and take corresponding protection measures.

[0006] According to one aspect of the embodiments of the present invention, a fan protection method is provided, including: obtaining the fan speed, fan negative pressure, engine speed and engine torque of the sanitation vehicle; determining a speed ratio coefficient based on the fan speed and the engine speed; determining the fan operating state based on the speed ratio coefficient, the fan negative pressure and the engine torque; determining a fan protection control strategy corresponding to the fan operating state.

[0007] Optionally, determining the fan operating state based on the speed ratio coefficient, the fan negative pressure and the engine torque includes: determining a speed detection result based on the speed ratio coefficient and a speed ratio threshold; determining a fan negative pressure reference value and an engine torque reference value corresponding to the current fan operating stage; comparing the fan negative pressure with the fan negative pressure reference value to obtain a fan negative pressure detection result; comparing the engine torque with the engine torque reference value to obtain an engine torque detection result; determining the fan operating state based on the speed detection result, the fan negative pressure detection result and the engine torque detection result.

[0008] Optionally, determine a fan protection control strategy corresponding to the fan operating state, including: when the fan operating state is normal operation, control the engine to rotate at a first predetermined speed, and perform kinetic energy transmission between the engine and the fan based on the transmission device; when the fan operating state is abnormal operation, control the engine to rotate at a second predetermined speed, and cut off the kinetic energy transmission between the engine and the fan.

[0009] Optionally, the above method further includes: when the fan speed is greater than a third predetermined speed, determine that the fan operating state is fan overspeed, and control the kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

[0010] Optionally, determine a fan protection control strategy corresponding to the fan operating state, including: when the fan operating state is fan overspeed, control the transmission device to perform kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

[0011] Optionally, the method further includes: perform voice alarm and / or pop-up window alarm based on the fan operating state.

[0012] According to another aspect of the embodiments of the present invention, there is also provided a fan protection device, including: an acquisition module for acquiring the fan speed, fan negative pressure, engine speed, and engine torque of a sanitation vehicle; a first determination module for determining a speed ratio coefficient based on the fan speed and the engine speed; a second determination module for determining the fan operating state based on the speed ratio coefficient, the fan negative pressure, and the engine torque; a third determination module for determining a fan protection control strategy corresponding to the fan operating state.

[0013] Optionally, the second determination module includes: a first determination unit for determining a speed detection result based on the speed ratio coefficient and a speed ratio threshold; a second determination unit for determining a fan negative pressure reference value and an engine torque reference value corresponding to the current fan operating stage; a first comparison unit for comparing the fan negative pressure with the fan negative pressure reference value to obtain a fan negative pressure detection result; a second comparison unit for comparing the engine torque with the engine torque reference value to obtain an engine torque detection result; a third determination unit for determining the fan operating state based on the speed detection result, the fan negative pressure detection result, and the engine torque detection result.

[0014] According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, the computer-readable storage medium includes a stored program, wherein, when the program runs, it controls the device where the computer-readable storage medium is located to execute the fan protection method of any one of the above.

[0015] According to another aspect of the embodiments of the present invention, there is also provided a computer device, including: a memory and a processor, the memory stores a computer program; the processor is configured to execute the computer program stored in the memory, and when the computer program runs, the processor executes the fan protection method of any one of the above.

[0016] In the embodiments of the present invention, a method of judging whether the fan is operating normally based on the operation monitoring data of the fan and the engine of the sanitation vehicle is adopted. By obtaining the fan speed, fan negative pressure, engine speed, and engine torque, the speed ratio coefficient between the fan speed and the engine speed is determined. Then, by comparing the speed ratio coefficient, fan negative pressure, and engine torque with the corresponding preset values under normal fan operation respectively, it is possible to accurately judge whether the fan is currently operating normally or what kind of fault has occurred to the fan, achieving the purpose of timely and accurately discovering the operation fault of the fan and taking corresponding fan protection control strategies for the occurred fault. Thus, the protection control of the fan in the sanitation vehicle is realized, avoiding the technical effects of the sanitation vehicle body fault caused by the fan fault or the reduction of the sanitation vehicle operation efficiency due to the abnormal operation state of the fan, and further solving the technical problem of being difficult to timely discover the fault of the fan in the sanitation vehicle and take corresponding protection measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 is a flowchart of the fan protection method provided according to the embodiments of the present invention;

[0019] Figure 2 is a flowchart of the control method for the operation protection of the sanitation vehicle fan provided according to an alternative embodiment of the present invention;

[0020] Figure 3 is a flowchart of the control composition and execution for the operation protection of the sanitation vehicle fan provided according to an alternative embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the parameter design interface provided according to an alternative embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the power transmission of the sanitation vehicle fan provided according to an alternative embodiment of the present invention;

[0023] Figure 6 is a structural block diagram of the fan protection device provided according to the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solution in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0026] According to an embodiment of the present invention, an embodiment of a method for fan protection is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0027] Figure 1 is a flowchart of the fan protection method provided according to an embodiment of the present invention, as Figure 1 shown, the method includes the following steps:

[0028] Step S102, obtain the fan speed, fan negative pressure, engine speed, and engine torque of the sanitation vehicle;

[0029] Step S104, determine the speed ratio coefficient based on the fan speed and the engine speed;

[0030] Step S106, determine the fan operating state based on the speed ratio coefficient, fan negative pressure, and engine torque;

[0031] Step S108, determine the fan protection control strategy corresponding to the fan operating state.

[0032] Through the above steps, the fan speed, fan negative pressure, engine speed, and engine torque are obtained. The speed ratio coefficient between the fan speed and the engine speed is determined. Then, by comparing the speed ratio coefficient, fan negative pressure, and engine torque with the corresponding preset values under normal fan operation respectively, it is possible to accurately determine whether the fan is currently operating normally or what kind of faults the fan has. This achieves the purpose of timely and accurately detecting the operating faults of the fan and taking corresponding fan protection control strategies for the occurring faults, thereby realizing the protection control of the fan in the sanitation vehicle, avoiding the sanitation vehicle body faults caused by fan faults or the reduction of the sanitation vehicle operation efficiency due to abnormal fan operation states, and further solving the technical problem of being difficult to timely detect the faults of the fan in the sanitation vehicle and take corresponding protection measures.

[0033] As an alternative embodiment, based on the speed ratio coefficient, fan negative pressure, and engine torque, determining the fan operation state includes: determining the speed detection result based on the speed ratio coefficient and the speed ratio threshold; determining the fan negative pressure reference value and the engine torque reference value corresponding to the current fan operation stage; comparing the fan negative pressure with the fan negative pressure reference value to obtain the fan negative pressure detection result; comparing the engine torque with the engine torque reference value to obtain the engine torque detection result; and determining the fan operation state based on the speed detection result, fan negative pressure detection result, and engine torque detection result. To improve the detection efficiency of the fan operation state and at the same time be able to quickly determine the fault type of the fan in case of fan faults, in this embodiment, by setting the speed ratio threshold, fan negative pressure reference value, and engine torque reference value, and comparing the speed ratio coefficient, fan negative pressure, and engine torque with the above values respectively, the speed detection result, fan negative pressure detection result, and engine torque detection result of the fan can be determined respectively, and then the operation state of the fan can be comprehensively determined based on the above detection results.

[0034] It should be noted that when determining the speed detection result, fan negative pressure detection result, and engine torque detection result in this embodiment, different error tolerance ranges can be set for the speed ratio threshold, fan negative pressure reference value, and engine torque reference value respectively. For example, when the difference between the speed ratio coefficient and the speed ratio threshold is within the error tolerance range, it can be considered that the speed ratio coefficient is still normal at this time. Among them, the above error tolerance range can be obtained according to the historical operation data of the fan and the engine.

[0035] It should be noted that the above speed ratio threshold, fan negative pressure reference value, and engine torque reference value in this embodiment can be set with different values according to different operation stages of the fan. For example, the speed ratio thresholds in the initial operation stage and the stable operation stage of the fan can be different, etc., so as to achieve the effect of accurately judging the fan operation state.

[0036] It should be noted that, in order to improve the detection efficiency of the fan operating state, this embodiment can also use the program-controlled look-up table method to quickly complete the determination of the rotational speed detection result, the fan negative pressure detection result, and the engine torque detection result.

[0037] As an alternative embodiment, determining the fan protection control strategy corresponding to the fan operating state includes: when the fan operating state is normal operation, controlling the engine to rotate at a first predetermined rotational speed, and performing kinetic energy transmission between the engine and the fan based on the transmission device; when the fan operating state is abnormal operation, controlling the engine to rotate at a second predetermined rotational speed, and cutting off the kinetic energy transmission between the engine and the fan. When the fan operating state is normal operation, the engine can be controlled to accelerate to the first predetermined rotational speed according to the operation requirements of the sanitation vehicle and perform constant-speed rotation to complete the operation. When the fan operating state is abnormal operation, to ensure the safety of the transmission between the fan and the engine, in this embodiment, the kinetic energy transmission between the engine and the fan is cut off at this time, and the engine is controlled to rotate at a second predetermined rotational speed, where the second predetermined rotational speed is lower than the first predetermined rotational speed. For example, the second predetermined rotational speed can be the idle speed, and so on.

[0038] Among them, the idle speed refers to the engine running without load, only overcoming the friction resistance of its own internal components, not outputting power externally, and the lowest rotational speed maintaining the stable operation of the engine is called the idle speed, which is one of the five basic operating conditions of the engine.

[0039] As an alternative embodiment, the above method further includes: when the fan rotational speed is greater than a third predetermined rotational speed, determining that the fan operating state is fan overspeed, and controlling the kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

[0040] As an alternative embodiment, determining the fan protection control strategy corresponding to the fan operating state includes: when the fan operating state is fan overspeed, controlling the transmission device to perform kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

[0041] For different fault types of the fan, this embodiment can also directly judge the fan operating state according to the fan rotational speed. For example, when the fan rotational speed is greater than the third predetermined rotational speed, it can be judged that the fan operating state is fan overspeed at this time. Since there is a kinetic energy transmission relationship between the fan and the engine, in this embodiment, the kinetic energy transmission between the engine and the fan is preferentially protected and controlled at this time. For example, controlling the kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

[0042] As an alternative embodiment, the above method further includes: performing voice alarm and / or pop-up window alarm based on the operating state of the fan. When the operating state of the fan is abnormal, on the one hand, corresponding protection control strategies can be automatically adopted according to the operating state of the fan. On the other hand, warning prompts can also be sent to the user through voice alarm and / or pop-up window alarm, so that the user can timely discover the fan operation failure, and the user can decide whether to conduct manual inspection or maintenance by himself / herself, etc., to avoid greater vehicle body failures caused by untimely fault handling.

[0043] Based on the above embodiments and alternative embodiments, the present invention proposes an alternative implementation manner, which will be described below.

[0044] An alternative implementation manner of the present invention proposes a control method for the operation protection of a sanitation vehicle fan.

[0045] Figure 2 is a flowchart of the control method for the operation protection of a sanitation vehicle fan provided according to an alternative implementation manner of the present invention. As Figure 2 shown, the control method for the operation protection of a sanitation vehicle fan provided by the alternative implementation manner of the present invention includes fan speed detection, fan negative pressure detection, engine speed detection, control program logic calculation, and engine speed control. The specific contents are as follows:

[0046] 1) Install a fan speed sensor

[0047] Detect the speed measurement frequency f, set the speed measurement number of teeth n and the speed measurement filtering period T through the display screen to ensure accurate and stable measurement of the traveling speed. The fan speed R(T) = (f / n) * 60; at the same time, the engine speed and torque are obtained through real-time detection with the engine controller via CAN communication.

[0048] 2) Write a control program

[0049] Figure 3 is a flowchart of the control composition and execution for the operation protection of a sanitation vehicle fan provided according to an alternative implementation manner of the present invention. As Figure 3 shown, during the fan startup process or after the fan rotates at high speed during normal operation, the detected fan speed and engine speed are calculated proportionally, and the obtained proportional coefficient is compared with the set normal fan operation speed coefficient. At the same time, the engine torque and the fan negative pressure are detected and compared with the corresponding normal values in the corresponding stages. The program automatically judges whether the fan is normal in the initial operation stage and the stable operation stage according to the parameters set in advance. Figure 4It is a schematic diagram of the parameter design interface provided according to an alternative embodiment of the present invention. For abnormal phenomena, the engine is immediately returned to idle speed, and the kinetic energy transmission between the fan and the engine is cut off, thus ensuring the safety of the fan transmission. At the same time, voice alarm prompts are given in the cab and alarm pop-up windows are shown on the display screen to ensure that the driver is aware of the abnormal phenomenon in the first time and takes inspection actions.

[0050] 3) Set the fan overspeed protection

[0051] By judging whether the fan speed is within the normal value to determine whether the transmission gear is correct, the driver is timely reminded to confirm the transmission gear in case of abnormality to eliminate the fault problem; at the same time, according to the negative pressure value, it is judged whether the fan suction system is normal, and the operator is reminded to check, so as to ensure the stability of the suction system and improve the operation efficiency of the whole vehicle.

[0052] 4) Power output

[0053] Figure 5 It is a schematic diagram of the power transmission of the fan operation of the sanitation vehicle provided according to an alternative embodiment of the present invention. As Figure 5 shown, the power output by the engine is transmitted to the transfer case through the gearbox. The upper-mounted controller controls the transfer case cylinder to take power from each power unit, transmits the power to the fan drive belt through the transmission shaft to drive the fan to rotate, and the controller realizes the normal operation of the fan negative pressure system by controlling the engine speed.

[0054] In summary, in the alternative embodiment of the present invention, first, according to the operation data, the fan operation parameters and the engine operation parameters are set. The fan is turned on, so that the transmission shaft takes power to rotate, and the engine drives the fan to rotate. Then, according to the program control logic, the fan protection control program is entered. Through the data monitoring of the controller, parameters such as the actual operating fan speed, engine speed, engine torque, and fan negative pressure are used to detect the fan operation data in real time, judge whether the fan is normal, and then control the engine speed. The upper-mounted controller communicates with the engine control computer to realize the control of the engine speed, and at the same time detects the engine speed and gives it to the fan protection control program for the logic calculation of the fan protection program. On the other hand, by installing a speed sensor and a negative pressure sensor on the fan, the fan speed and the negative pressure of the fan shaft suction are detected in real time. The two sensors transmit the detection signals to the upper-mounted controller. The controller converts the analog signals into actual data through the measurement program and transmits the actual operation data to the fan protection program for protection logic judgment. The engine transmits kinetic energy to the fan through the mechanical transmission shaft, and the shaft suction negative pressure generated by the rotation of the fan sweeps and collects the garbage, realizing the cleaning operation of the sanitation vehicle.

[0055] The control method for the operation protection of the sanitation vehicle fan in an alternative embodiment of the present invention can provide guarantee for the operation of the sanitation vehicle fan, effectively avoiding fan drive failures caused by anomalies such as fan jamming and fan overspeed during the operation process. At the same time, it can also ensure the stable operation of the negative pressure system of the sanitation vehicle suction operation, ensuring the best performance of the operation effect. The entire control process is automatically executed, effectively reducing the operation difficulty and improving the overall operation effect of the machine, maximizing the safety and efficiency of the sanitation vehicle operation.

[0056] According to an embodiment of the present invention, there is also provided a fan protection device. Figure 6 FIG. is a structural block diagram of the fan protection device provided according to an embodiment of the present invention. As Figure 6 shown, the device includes: an acquisition module 61, a first determination module 62, a second determination module 63, and a third determination module 64. The device will be described below.

[0057] The acquisition module 61 is configured to acquire the fan speed, fan negative pressure, engine speed, and engine torque of the sanitation vehicle; the first determination module 62 is connected to the above acquisition module 61 and is configured to determine a speed ratio coefficient based on the fan speed and the engine speed; the second determination module 63 is connected to the first determination module 62 and is configured to determine the fan operation state based on the speed ratio coefficient, the fan negative pressure, and the engine torque; the third determination module 64 is connected to the second determination module 63 and is configured to determine a fan protection control strategy corresponding to the fan operation state.

[0058] As an alternative embodiment, the second determination module 63 includes: a first determination unit configured to determine a speed detection result based on the speed ratio coefficient and a speed ratio threshold value; a second determination unit configured to determine a fan negative pressure reference value and an engine torque reference value corresponding to the current fan operation stage; a first comparison unit configured to compare the fan negative pressure with the fan negative pressure reference value to obtain a fan negative pressure detection result; a second comparison unit configured to compare the engine torque with the engine torque reference value to obtain an engine torque detection result; a third determination unit configured to determine the fan operation state based on the speed detection result, the fan negative pressure detection result, and the engine torque detection result.

[0059] According to an embodiment of the present invention, there is also provided a computer-readable storage medium. The computer-readable storage medium includes a stored program. When the program runs, it controls the device where the computer-readable storage medium is located to execute the fan protection method of any one of the above items.

[0060] According to an embodiment of the present invention, there is also provided a computer device, including: a memory and a processor. The memory stores a computer program; the processor is configured to execute the computer program stored in the memory. When the computer program runs, the processor is caused to execute the fan protection method of any one of the above items.

[0061] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0062] In the above embodiments of the present invention, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0063] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0064] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0065] In addition, the functional units in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0066] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention. The foregoing storage medium includes: USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks or optical discs and other various media that can store program codes.

[0067] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fan protection method, characterized in that, Including: Obtain the fan speed, fan negative pressure, engine speed, and engine torque of the sanitation vehicle; Based on the fan speed and the engine speed, determine the speed ratio coefficient; Based on the speed ratio coefficient, the fan negative pressure, and the engine torque, determine the fan operating state; Determine the fan protection control strategy corresponding to the fan operating state; Wherein, the determining the fan operating state based on the speed ratio coefficient, the fan negative pressure, and the engine torque includes: determining a speed detection result based on the speed ratio coefficient and a speed ratio threshold; determining a fan negative pressure reference value and an engine torque reference value corresponding to the current fan operating stage; comparing the fan negative pressure with the fan negative pressure reference value to obtain a fan negative pressure detection result; comparing the engine torque with the engine torque reference value to obtain an engine torque detection result; determining the fan operating state based on the speed detection result, the fan negative pressure detection result, and the engine torque detection result; Wherein, different speed ratio thresholds, the fan negative pressure reference value, and the engine torque reference value are set according to different operating stages.

2. The method according to claim 1, characterized in that, The determining the fan protection control strategy corresponding to the fan operating state includes: When the fan operating state is normal operation, control the engine to rotate at a first predetermined speed, and perform kinetic energy transmission between the engine and the fan based on the transmission device; When the fan operating state is abnormal operation, control the engine to rotate at a second predetermined speed, and cut off the kinetic energy transmission between the engine and the fan.

3. The method according to claim 1, wherein The method further includes: When the fan speed is greater than a third predetermined speed, determine that the fan operating state is fan overspeed, and control the kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

4. The method according to claim 3, characterized in that, The determining the fan protection control strategy corresponding to the fan operating state includes: When the fan operating state is fan overspeed, control the transmission device to perform kinetic energy transmission between the engine and the fan according to a predetermined transmission gear.

5. The method according to claim 1, characterized in that, The method further includes: Based on the fan operating state, perform voice alarm and / or pop-up alarm.

6. A fan protection device, characterized in that, Including: An acquisition module for acquiring the fan speed, fan negative pressure, engine speed, and engine torque of the sanitation vehicle; A first determination module for determining a speed ratio coefficient based on the fan speed and the engine speed; A second determination module for determining the fan operating state based on the speed ratio coefficient, the fan negative pressure, and the engine torque; A third determination module for determining the fan protection control strategy corresponding to the fan operating state; Among them, the second determination module includes: a first determination unit, configured to determine a rotational speed detection result based on the rotational speed ratio coefficient and the rotational speed ratio threshold; a second determination unit, configured to determine a fan negative pressure reference value and an engine torque reference value corresponding to the current fan operation stage; a first comparison unit, configured to compare the fan negative pressure with the fan negative pressure reference value to obtain a fan negative pressure detection result; a second comparison unit, configured to compare the engine torque with the engine torque reference value to obtain an engine torque detection result; a third determination unit, configured to determine the fan operation state based on the rotational speed detection result, the fan negative pressure detection result, and the engine torque detection result. Among them, the device is further configured to set different rotational speed ratio thresholds, the fan negative pressure reference value, and the engine torque reference value according to different operation stages.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program runs, it controls the device where the computer-readable storage medium is located to execute the fan protection method according to any one of claims 1 to 5.

8. A computer device, characterized in that, Comprising: a memory and a processor, the memory stores a computer program; the processor is configured to execute the computer program stored in the memory, and when the computer program runs, it causes the processor to execute the fan protection method according to any one of claims 1 to 5.

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