A control method of a non-road engine positive-reverse rotation fan

Abstract

The application relates to the technical field of engine thermal management measures, and particularly discloses a control method for a non-road engine reverse rotation fan, which comprises automatic control and manual control, the manual control step is to open the fan reverse rotation button, and the automatic control comprises the following steps: S01, acquiring the running data of an engine in real time based on a detection point; S02, acquiring whether the relay is attracted to determine whether the fan is running under the engine running; S03, analyzing the running data and comparing the running data with a preset hysteresis interval threshold value, if the threshold value is met, the countdown limit value of the fan reverse rotation can be triggered, and when the countdown limit value exceeds the interval time from the last reverse rotation, a fan reverse rotation strategy is generated; and S04, switching the direction of the fan according to the fan reverse rotation strategy. The application can effectively avoid the high-temperature risk caused by the blockage of the radiator by foreign matters based on the dynamic correction of the activation time of the fan reverse rotation.

Description

Technical Field

[0001] This invention relates to the field of engine thermal management technology, specifically to a control method for the forward and reverse rotation fans of a non-road engine. Background Technology

[0002] Non-road engines commonly use direct-drive fans to cool the radiator. (Reference: Publication No. CN107654283A, Publication Date: 2018-02-02). The reference direct-drive fan system includes a drive pulley fixedly connected to the engine output shaft, a fan, a tension pulley, a fan wheel assembly, and a reversing pulley assembly. The fan wheel assembly includes a fan shaft, a forward-rotating pulley, and a reverse-rotating pulley. The fan shaft is selectively engaged with either the forward-rotating or reverse-rotating pulley. The reversing pulley assembly includes a reversing pulley and a reversing intermediate pulley. The drive pulley, tension pulley, forward-rotating pulley, and reversing pulley are connected by a belt drive. The rotation direction of the forward-rotating pulley is opposite to the rotation direction of the drive pulley, tension pulley, and reversing pulley. The reverse-rotating pulley and the reversing intermediate pulley are connected by a belt and rotate in the same direction. When the reverse-rotating pulley is engaged with the fan shaft, the reversing pulley is engaged with the reverse-rotating intermediate pulley. This invention enables the fan to rotate in both directions. When maintaining the radiator, reversing the fan can remove lint and dust, thereby maintaining the heat dissipation performance.

[0003] In the prior art, including the aforementioned patents, due to the harsh application scenarios, the radiator is easily blocked by foreign objects, leading to abnormally high engine temperatures, affecting engine lifespan and user experience. Summary of the Invention

[0004] The purpose of this invention is to provide a control method for the forward and reverse rotation fan of a non-road engine, which determines the forward and reverse rotation execution mode of the fan based on conditions such as engine coolant temperature and engine oil temperature, thereby avoiding engine overheating problems caused by radiator blockage.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A control method for a non-road engine's reversible fan includes automatic control and manual control. The manual control step involves pressing a fan reversal button to activate the fan, while the automatic control includes the following steps:

[0007] S01. Real-time acquisition of engine operating data based on detection points;

[0008] S02. Determine whether the fan is running while the engine is running by checking whether the relay is engaged.

[0009] S03. Analyze the running data and compare it with the preset hysteresis interval threshold. If the threshold is met, the countdown limit for fan reversal can be triggered. When the countdown limit exceeds the time interval since the last reversal, a fan reversal strategy is generated.

[0010] S04, according to the fan reverse strategy, performing the switching of the fan direction.

[0011] As preferred, the operating data includes engine speed, engine temperature and engine torque percentage value, wherein:

[0012] The engine temperature includes engine operating temperature, water temperature and oil temperature.

[0013] As preferred, the threshold of the hysteresis interval in step S03 includes engine speed reaching a predetermined value, and the relay is not attracted, the fan remains positive rotation.

[0014] As preferred, in the execution of the fan reverse in step S03, the reverse fan countdown limit value is dynamically set based on the maximum value of the water temperature and the oil temperature, and is dynamically corrected according to the rising rate of the engine operating temperature, including:

[0015]

[0016] Wherein, T wate r is the water temperature, T oil is the oil temperature, T engine is the engine operating temperature, T water，max is the preset maximum threshold of water temperature, T oil,max is the preset maximum threshold of oil temperature, T engine,max is the preset maximum threshold of engine operating temperature, T water，start is the starting water temperature threshold, T oil,start is the starting oil temperature threshold, T engine，start is the starting engine temperature threshold.

[0017] Synthetic speed regulation maximum factor factor:

[0018] factor = max(factor water , factor oil , factor engine );

[0019] Fan reverse duration:

[0020] fan speed (RPM) = RPM min +(factor × (RPM max -RPM min )).

[0021] As preferred, the reversing of the fan in the step S03 further comprises preset prohibited conditions of the fan reversing, the prohibited conditions comprising that the fan control button is in a prohibited state, the fan electrical appliance is in failure, the engine rotating speed exceeds an upper limit preset value, the engine temperature exceeds an upper limit preset value and the torque percentage exceeds an upper limit preset value.

[0022] And under the automatic control and the manual control, when the fan reversing is triggered and the prohibited condition is triggered, the reversing is directly ended and the forward rotation is executed.

[0023] As preferred, the fan reversing strategy in the step S04 comprises the following steps:

[0024] S41, the forward rotation reversing relay is disconnected, and the fan loses the power rotating speed which gradually decreases with time;

[0025] S42, the forward rotation relay is disconnected and the reversing relay is attracted, at this time, the fan is powered and the reversing is realized, and after a certain time, the radiator is blown and cooled;

[0026] S43, while the step S42 is executed, the forward rotation reversing relay is disconnected, and the fan loses the power rotating speed which gradually decreases with time;

[0027] S44, the reversing relay is disconnected and the forward rotation relay is attracted, at this time, the fan is powered and the forward rotation is recovered.

[0028] As preferred, when the step S42 is executed, the prohibited condition is triggered, and the reversing cycle is immediately stopped and the subsequent reversing process is executed.

[0029] As preferred, when the steps S43 and S44 are executed, the reversing prohibited condition is triggered, and the reversing cycle is continued to be completed.

[0030] In the above technical solution, the control method of the forward and reverse fan of the non-road engine provided by the application has the following beneficial effects: during the operation of the non-road engine, the forward rotation and the reverse rotation of the engine radiator fan are controlled, the high temperature risk caused by the radiator blocked by foreign matters is effectively avoided, the user is prevented from frequently cleaning the surface of the radiator during the operation, and the operation efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0032] Figure 1 The flow chart of the fan automatic control provided by the embodiment of the application;

[0033] Figure 2 The embodiment of the application provides a positive rotation fan control opening implementation schematic diagram.

[0034] Figure 3 The embodiment of the application provides a reverse rotation fan control opening implementation schematic diagram.

[0035] Figure 4 The embodiment of the application provides a reverse rotation fan control inhibition implementation schematic diagram.

[0036] Figure 5 The embodiment of the application provides a reverse rotation fan operation cycle implementation schematic diagram. DETAILED DESCRIPTION

[0037] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0038] Embodiment one

[0039] As shown in Figure 1 A control method of a non-road engine positive and negative rotation fan, including automatic control and manual control, the manual control step is to open the fan reverse rotation button, and the automatic control includes the following steps:

[0040] S01, real-time acquisition of the running data of the engine based on the detection point;

[0041] S02, acquisition of whether the relay is attracted to determine whether the fan is running under the engine running;

[0042] S03, analysis according to the running data, and comparison with the threshold value of the preset hysteresis interval, if the threshold value is met, the countdown limit value of the fan reverse rotation can be triggered, and when the countdown limit value exceeds the interval time from the last reverse rotation, the fan reverse rotation strategy is generated;

[0043] S04, switching of the direction of the fan according to the fan reverse rotation strategy.

[0044] It should be noted that the running data in the above embodiment includes the engine speed, the engine temperature and the engine torque percentage value, wherein:

[0045] The engine temperature includes the engine operating temperature, the water temperature and the oil temperature.

[0046] In the step S03 of the above embodiment, the threshold of the hysteresis interval includes that the engine speed reaches a predetermined value, and the relay is not attracted, and the fan keeps rotating forward. That is, after the engine starts, the relay, that is, the forward rotation relay is attracted and the reverse rotation relay is not attracted, and the fan keeps rotating forward. And no matter the fan rotates forward or reversely, after the engine stops, it is restored to the state that the forward rotation relay is attracted and the reverse rotation relay is not attracted.

[0047] Embodiment Two

[0048] Based on the first embodiment, in the execution of the reverse rotation of the fan, the maximum value of the water temperature and the oil temperature is dynamically set to the countdown time limit value of the reverse rotation fan, and the engine operating temperature rising rate is dynamically corrected, including:

[0049]

[0050] Wherein, T water is the water temperature, T oil is the oil temperature, T engine is the engine operating temperature, T water，max is the preset maximum threshold of the water temperature, T oil,max is the preset maximum threshold of the oil temperature, T engine，max is the preset maximum threshold of the engine operating temperature, T water，start is the starting water temperature threshold, T oil，start is the starting oil temperature threshold, T engine，start is the starting engine temperature threshold.

[0051] The maximum factor factor of the synthetic speed regulation is:

[0052] factor = max(factor water , factor oil , factor engine );

[0053] The fan reverse rotation time:

[0054] fan speed (RPM) = RPM min +(factor × (RPM max -RPM min )).

[0055] Therefore, the maximum value of the current water temperature and the oil temperature is dynamically set to the reverse rotation fan, so as to dynamically change the countdown time limit value, that is, the fan reverse rotation time.

[0056] Embodiment Three

[0057] In the embodiment one, in this example, when the fan needs to switch to reverse, the preset fan reverse prohibition condition needs to be considered, the prohibition condition includes the fan control button in the prohibited state, the fan electrical appliance failure, the engine speed exceeds the upper limit preset value, the engine temperature exceeds the upper limit preset value and the torque percentage exceeds the upper limit preset value. Therefore, under the fan reverse trigger of automatic control and manual control, and when the reverse prohibition condition is triggered, the reverse is directly ended, and the forward rotation is executed.

[0058] Embodiment four

[0059] In the embodiment one, in this example, the fan reverse strategy includes the following steps:

[0060] S41, disconnect the forward rotation reverse relay, the fan loses power and the speed gradually decreases with time( Figure 2 );

[0061] S42, disconnect the forward rotation relay and attract the reverse relay, at this time the fan is powered and realizes reverse, after a certain time the radiator is blown( Figure 3 );

[0062] S43, while executing step S42, disconnect the forward rotation reverse relay, the fan loses power and the speed gradually decreases with time( Figure 4 );

[0063] S44, disconnect the reverse relay and attract the forward rotation relay, at this time the fan is powered and restores forward rotation( Figure 4 )。

[0064] And when executing step 42, the prohibition condition is triggered, then the reverse cycle is immediately stopped, and the subsequent reverse process is executed.

[0065] And when executing step 43 and step 44, the reverse prohibition condition is triggered, then the reverse cycle is continued to complete.

[0066] In summary, during the operation of the off-road engine, by controlling the forward rotation and reverse rotation of the engine radiator fan, the risk of high temperature caused by the radiator being blocked by foreign matter can be effectively avoided, the user can avoid frequently cleaning the surface of the radiator during operation, and the operation efficiency is improved.

[0067] Those skilled in the art will appreciate that embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0068] The present application is described with reference to the drawings in which are shown flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart and / or block diagrams, and combinations of blocks in the flowchart and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0069] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0070] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0071] The principles and implementation manners of the present application are described in the specific embodiments. The above embodiment descriptions are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application scopes can be changed; therefore, the content of the present application should not be understood as limitation.

[0072] The embodiments of the present application also provide a specific implementation manner of an electronic device capable of implementing all steps in the method in the above embodiments, and the electronic device specifically includes the following content.

[0073] a processor, a memory, a communications interface and a bus;

[0074] The processor, the memory and the communications interface complete mutual communication through the bus.

[0075] The processor is configured to invoke a computer program in the memory, and the processor implements all steps in the method in the above embodiments when executing the computer program.

[0076] Embodiments of the present application also provide a computer readable storage medium capable of implementing all steps in the method in the above embodiments, and the computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement all steps in the method in the above embodiments.

[0077] The various embodiments described in this specification are intended to be illustrative only and in no way limit the scope of the application. Thus, changes and modifications can be made by those skilled in the art, with the scope of the application being indicated by the following claims. For example, although the various embodiments have been described above in the context of fully functional devices, the implementation is equally applicable to distributed or networked implementations where tasks are performed by remote processing devices that are linked through a communications network. In other embodiments, various operational elements of the described embodiments can be combined or eliminated, and other operational elements can be added. Various embodiments can be implemented using hardware elements, software elements, or a combination of both. Examples of hardware elements can include devices, logic devices, components, processors, microprocessors, circuits, boards, memories, storage devices, buses, wires, communication devices, transmitters, receivers, and / or the like. Examples of software elements can include software components, programs, applications, computer programs, application programs, system programs, software development programs, machine programs, operating system Figure 1 one or more functions specified by one or more blocks or Figure 1 one or more blocks or

[0078] Those skilled in the art will appreciate that embodiments of the present specification can be devised for a method, a system, or a computer program product. Accordingly, embodiments of the present specification can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present specification can be in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROM, optical storage medium, etc.) embodying computer usable program code. Each of the various embodiments of the present specification is described in a progressive manner, and reference can be made to other embodiments for the same or similar parts. Each embodiment focuses on the differences from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and reference can be made to the description of the method embodiments. In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present specification.

[0079] In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction. The above is only an embodiment of the embodiments of the present specification and is not intended to limit the embodiments of the present specification. The embodiments of the present specification can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the embodiments of the present specification shall be included in the scope of the claims of the embodiments of the present specification.

Claims

1. A control method of a non-road engine positive-reverse fan, characterized in that, The method comprises automatic control and manual control, the manual control step is to open the fan reverse button, and the automatic control comprises the following steps: S01, acquiring running data of the engine in real time based on a detection point; S02, acquiring whether a relay is attracted to determine whether the fan runs under the engine running; S03, analyzing the running data and comparing the analyzed data with a preset threshold of a hysteresis interval, if the threshold is met, a countdown limit value of fan reverse is triggered, and if the countdown limit value exceeds an interval time from the last reverse, a fan reverse strategy is generated; S04, switching the direction of the fan according to the fan reverse strategy.

2. The control method of a non-road engine positive-reverse fan according to claim 1, characterized in that, The running data comprises engine speed, engine temperature and engine torque percentage value, wherein: The engine temperature comprises engine running temperature, water temperature and oil temperature.

3. The control method of a non-road engine positive-reverse fan according to claim 1, characterized in that, The threshold of the hysteresis interval in the step S03 comprises that the engine speed reaches a predetermined value, the relay is not attracted, and the fan keeps forward rotation.

4. The control method of a non-road engine positive-reverse fan according to claim 1, characterized in that, In the step S03, the countdown limit value of the reverse fan is dynamically set based on the maximum value of the water temperature and the oil temperature, and is dynamically corrected according to the rising rate of the engine running temperature, comprising: wherein T water is the water temperature, T oil is the oil temperature, T engine is the engine operating temperature, T water，max is the preset maximum threshold value for the water temperature, T oil，max is the preset maximum threshold value for the oil temperature, T engine，max is the preset maximum threshold value for the engine operating temperature, T water，start is the starting water temperature threshold value, T oil，start is the starting oil temperature threshold value, T engine，start is the starting engine temperature threshold value; Synthetic speed regulation maximum factor factor: factor = max(factor water , factor oil , factor engine ); Fan reverse time: fan speed (RPM) = RPM min + (factor x (RPM max - RPM min )).

5. The control method of a non-road engine positive-reverse fan according to claim 1, characterized in that, The step S03 further comprises preset fan reverse prohibition conditions, the prohibition conditions comprise that a fan control button is in a prohibited state, a fan relay fails, the engine speed exceeds an upper limit preset value, the engine temperature exceeds an upper limit preset value and the torque percentage exceeds an upper limit preset value; If the fan reverse is triggered under the automatic control and the manual control, and the reverse prohibition condition is triggered, the reverse is directly ended and the forward rotation is executed.

6. The control method of a non-road engine positive-reverse fan according to claim 1, characterized in that, The fan reverse strategy in the step S04 comprises the following steps: S41, disconnecting the forward reverse relay, and gradually reducing the fan power speed with time; S42, disconnecting the forward relay and attracting the reverse relay, at this time, the fan is powered and realizes reverse, and after a certain time, the radiator is blown and cooled; S43, disconnecting the forward reverse relay while executing the step S42, and gradually reducing the fan power speed with time; S44, disconnecting the reverse relay and attracting the forward relay, at this time, the fan is powered and realizes forward rotation.

7. The control method of a non-road engine positive-reverse fan according to claim 6, characterized in that, When the step S42 is executed, if the prohibition condition is triggered, the reverse cycle is immediately stopped and the subsequent reverse process is executed.

8. The control method of a non-road engine positive-reverse fan according to claim 6, characterized in that, When the steps S43 and S44 are executed, if the reverse prohibition condition is triggered, the reverse cycle is continued to be completed.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the steps of the control method of the non-road engine forward and reverse fan according to any one of claims 1 to 8.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the control method of the non-road engine forward and reverse fan according to any one of claims 1 to 8.

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