Control method for forward and reverse rotation fan of non-road engine

Abstract

The invention relates to the technical field of engine thermal management measures, and particularly discloses a non-road engine forward and reverse rotation fan control method which comprises automatic control and manual control, the manual control step is that a fan reverse rotation key is started, and the automatic control step comprises the following steps that S01, operation data of an engine are obtained in real time based on detection points; s02, whether the relay is closed or not is obtained so as to judge whether a fan runs or not when the engine runs; s03, analysis is conducted according to the operation data, comparison judgment is conducted on the operation data and a preset threshold value of a hysteresis interval, if the threshold value is met, a countdown limit value of fan reverse rotation can be triggered, and when the countdown limit value exceeds the interval time from last reverse rotation, a fan reverse rotation strategy is generated; and S04, according to the fan reverse rotation strategy, switching of the rotating direction of the fan is executed. The activation time of fan reverse rotation is dynamically corrected based on the engine temperature, and the high-temperature risk caused by the fact that a radiator is blocked by foreign matter can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of engine thermal management measures, and in particular to a control method for a forward and reverse rotation fan of a non-road engine. Background Art

[0002] Non-road engines generally use engine direct-drive fans to cool down the radiator. Reference: Publication (Announcement) No.: CN107654283A, Publication (Announcement) Date: 2018-02-02, Reference The engine direct-drive fan system includes a driving wheel fixedly connected to the engine output shaft, a fan, a tensioning wheel, a fan wheel group, and a reversing wheel group. The fan wheel group includes a fan shaft, a forward wheel and a reverse wheel. The fan shaft is selectively engaged with the forward wheel or the reverse wheel; the reversing wheel group includes a reversing wheel and a reversing intermediate wheel; the driving wheel, the tensioning wheel, the forward wheel, and the reversing wheel are connected by belt transmission, and the rotation direction of the forward wheel is opposite to that of the driving wheel, the tensioning wheel, and the reversing wheel; the reversing wheel and the reversing intermediate wheel are connected by belts in the same direction of rotation, and when the reversing wheel is engaged with the fan shaft, the reversing wheel is engaged with the reverse intermediate wheel. The present invention can realize the forward and reverse rotation of the fan, and when the radiator is maintained. The fan reversal can remove flying catkins and dust. Thereby maintaining the heat dissipation performance.

[0003] In the prior art including the above-mentioned patents, due to the harsh application scenarios, the radiator is easily blocked by foreign objects, causing abnormally high engine temperatures, affecting the engine's service life and user experience. Summary of the invention

[0004] The purpose of the present 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 water temperature and oil temperature, thereby avoiding the problem of engine high temperature caused by radiator blockage.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for controlling a forward and reverse fan of a non-road engine includes automatic control and manual control. The manual control step is to turn on a fan reverse button, and the automatic control includes the following steps:

[0007] S01. Acquire engine operation data in real time based on detection points;

[0008] S02, obtaining whether the relay is energized to determine whether the fan is running when the engine is running;

[0009] S03, analyzing the operation data and comparing it with the preset threshold of the hysteresis interval. If the threshold is met, the countdown limit of the fan reversal can be triggered, and when the countdown limit exceeds the interval time from the last reversal, a fan reversal strategy is generated;

[0010] S04. Switching the direction of rotation of the fan is executed according to the fan reversal strategy.

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

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

[0013] Preferably, the threshold of the hysteresis interval in step S03 includes that the engine speed reaches a predetermined value, the relay is not energized, and the fan keeps rotating forward.

[0014] Preferably, in executing the reversal of the fan in step S03, a countdown limit for reversing the 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 operating temperature, including:

[0015]

[0016] Among them, T wate r is water temperature, T oil is the oil temperature, T engine is the engine operating temperature, T water，max is the preset maximum water temperature threshold, T oil,max is the preset maximum oil temperature threshold, 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] The maximum factor of synthetic speed adjustment:

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

[0019] Fan reverse time:

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

[0021] Preferably, the reversal of the fan in step S03 further includes a preset prohibition condition for the fan reversal, wherein the prohibition condition includes a fan control button being in a prohibited state, a fan electrical failure, an engine speed exceeding an upper limit preset value, an engine temperature exceeding an upper limit preset value, and a torque percentage exceeding an upper limit preset value;

[0022] When the fan is reversed under automatic control and manual control and the reverse prohibition condition is triggered, the reverse rotation is directly terminated and the forward rotation is executed.

[0023] Preferably, the fan reversal strategy in step S04 includes the following steps:

[0024] S41, disconnect the forward and reverse relay, the fan loses power and the speed gradually decreases over time;

[0025] S42, disconnect the forward relay and attract the reverse relay, then the fan is powered and reverses, and after a certain period of time, the radiator is purged;

[0026] S43, while executing step S42, the forward and reverse relays are disconnected, and the fan loses power and the speed gradually decreases over time;

[0027] S44, disconnect the reverse relay and energize the forward relay. At this time, the fan is powered and resumes forward rotation.

[0028] Preferably, when executing step 42, if a prohibition condition is triggered, the reversal cycle stops immediately and a subsequent reversal process is executed.

[0029] Preferably, when executing step 43 and step 44, a reverse prohibition condition is triggered, and the reverse cycle is continued to be completed.

[0030] In the above technical scheme, a control method for the forward and reverse rotation fan of a non-road engine provided by the present invention has the following beneficial effects: during the operation of the non-road engine, by controlling the forward and reverse rotation of the engine heat dissipation fan, the high temperature risk caused by the radiator being blocked by foreign objects can be effectively avoided, and the user can avoid frequent cleaning of the radiator surface during operation, thereby improving the operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Flow chart of fan automatic control provided by an embodiment of the present invention

[0033] Figure 2 A schematic diagram of the implementation of the forward-rotating fan control start-up provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of implementing the control of turning on a reverse fan provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of implementing the prohibition of reverse fan control provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of an implementation of a reverse fan operation cycle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Embodiment 1

[0039] like Figure 1 As shown, a method for controlling a forward and reverse fan of a non-road engine includes automatic control and manual control. The manual control step is to turn on the fan reverse button, and the automatic control includes the following steps:

[0040] S01. Acquire engine operation data in real time based on detection points;

[0041] S02, obtaining whether the relay is energized to determine whether the fan is running when the engine is running;

[0042] S03, analyzing the operation data and comparing it with the preset hysteresis interval threshold. If the threshold is met, the countdown limit of the fan reversal can be triggered, and when the countdown limit exceeds the interval time from the last reversal, a fan reversal strategy is generated;

[0043] S04. Switching the direction of the fan according to the fan reversal strategy.

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

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

[0046] The threshold of the hysteresis interval referred to in step S03 in the above embodiment includes that the engine speed reaches a predetermined value, and the relay is not energized, and the fan keeps rotating forward. That is, after the engine is started, the relay, that is, the forward relay is energized and the reverse relay is not energized, and the fan keeps rotating forward. And no matter whether the fan rotates forward or reverse, when the engine stops, it returns to the state where the forward relay is energized and the reverse relay is not energized.

[0047] Embodiment 2

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

[0049]

[0050] Among them, 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 water temperature threshold, T oil,max is the preset maximum oil temperature threshold, 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;

[0051] The maximum factor of synthetic speed adjustment:

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

[0053] Fan reverse time:

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

[0055] The reverse fan is thus dynamically set according to the maximum values ​​of the current water temperature and the oil temperature, thereby dynamically changing the countdown limit, that is, the fan reverse duration.

[0056] Embodiment 3

[0057] Based on the first embodiment, in this example, when the fan needs to switch to reverse, the preset fan reverse prohibition conditions need to be considered, and the prohibition conditions include the fan control button being in the prohibited state, the fan electrical failure, the engine speed exceeding the upper limit preset value, the engine temperature exceeding the upper limit preset value, and the torque percentage exceeding the upper limit preset value. Therefore, when the fan reverse is triggered under automatic control and manual control, and the reverse prohibition condition is triggered, the reverse rotation is directly terminated and the forward rotation is executed.

[0058] Embodiment 4

[0059] Based on the first embodiment, in this example, the fan reversal strategy includes the following steps:

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

[0061] S42, disconnect the forward relay and attract the reverse relay. At this time, the fan is powered and reverses. After a certain period of time, the radiator is purged ( Figure 3 );

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

[0063] S44, disconnect the reverse relay and attract the forward relay, then the fan is powered and resumes forward rotation ( Figure 4 ).

[0064] When executing step 42, if the prohibition condition is triggered, the reversal cycle stops immediately and the subsequent reversal process is executed.

[0065] When executing step 43 and step 44, the reverse prohibition condition is triggered, and the reverse cycle is continued to be completed.

[0066] In summary, during the operation of non-road engines, by controlling the forward and reverse rotation of the engine's heat dissipation fan, the risk of high temperature caused by the radiator being blocked by foreign objects can be effectively avoided, and the user can avoid frequent cleaning of the radiator surface during operation, thereby improving operating efficiency.

[0067] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may 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-ROM, optical storage, etc.) containing computer-usable program code.

[0068] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0069] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0070] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0071] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

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

[0073] Processor, memory, communications interface and bus;

[0074] Wherein, the processor, memory, and communication interface communicate with each other via the bus;

[0075] The processor is used to call the computer program in the memory, and when the processor executes the computer program, all the steps in the method in the above embodiment are implemented.

[0076] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all the steps of the method in the above embodiments, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, all the steps of the method in the above embodiments are implemented.

[0077] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Although the embodiment of this specification provides the method operation steps described in the embodiment or flow chart, more or less operation steps can be included based on conventional or non-creative means. The order of steps listed in the embodiment is only one way of executing the order of many steps, and does not represent the only execution order. When the device or terminal product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiment or the accompanying drawings (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment). The term "include", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such a process, method, product or device. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or device including the elements. For the convenience of description, the above device is described by dividing it into various modules according to its functions. Of course, when implementing the embodiments of this specification, the functions of each module can be implemented in the same one or more software and / or hardware, or the module implementing the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as 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 coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The present invention is described with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the process and / or box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0078] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the embodiments of this specification may be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment. In the description of this specification, the description of the reference term "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification.

[0079] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other. The above is only an embodiment of the embodiment of this specification and is not intended to limit the embodiment of this specification. For those skilled in the art, the embodiment of this specification may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiment of this specification shall be included in the scope of the claims of the embodiment of this specification.

Claims

1. A method for controlling a non-road engine forward and reverse fan, characterized in that: It includes automatic control and manual control. The manual control step is to turn on the fan reverse button, and the automatic control includes the following steps: S01. Acquire engine operation data in real time based on detection points; S02, obtaining whether the relay is energized to determine whether the fan is running when the engine is running; S03, analyzing the operation data and comparing it with the preset threshold of the hysteresis interval. If the threshold is met, the countdown limit of the fan reversal can be triggered, and when the countdown limit exceeds the interval time from the last reversal, a fan reversal strategy is generated; S04. Switching the direction of rotation of the fan is executed according to the fan reversal strategy.

2. A method for controlling a non-road engine forward and reverse fan according to claim 1, characterized in that: The operating data includes the engine speed, the engine temperature and the engine torque percentage value, wherein: The temperature of the engine includes engine operating temperature, water temperature and oil temperature.

3. The method for controlling a non-road engine forward and reverse fan according to claim 1, characterized in that: The threshold of the hysteresis interval in step S03 includes that the engine speed reaches a predetermined value, the relay is not energized, and the fan keeps rotating forward.

4. The method for controlling a non-road engine forward and reverse fan according to claim 1, characterized in that: In executing the reverse rotation of the fan in step S03, dynamically setting the countdown limit of the reverse rotation of the fan based on the maximum value of the water temperature and the oil temperature, and dynamically correcting it according to the rising rate of the engine operating temperature, including: Among them, 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 water temperature threshold, T oil，max is the preset maximum oil temperature threshold, 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; The maximum factor of synthetic speed adjustment: factor=max(factor water ,factor oil ,factor engine ); Fan reverse time: fan speed(RPM)=RPM min +(factor×(RPM max -RPM min ))。 5. The method for controlling a non-road engine forward and reverse fan according to claim 1, characterized in that: The fan reversal in step S03 also includes preset fan reversal prohibition conditions, which include fan control button being in a prohibited state, fan electrical failure, engine speed exceeding an upper limit preset value, engine temperature exceeding an upper limit preset value, and torque percentage exceeding an upper limit preset value; When the fan is reversed under automatic control and manual control and the reverse prohibition condition is triggered, the reverse rotation is directly terminated and the forward rotation is executed.

6. The method for controlling a non-road engine forward and reverse fan according to claim 1, characterized in that: The fan reversal strategy in step S04 includes the following steps: S41, disconnect the forward and reverse relay, the fan loses power and the speed gradually decreases over time; S42, disconnect the forward relay and attract the reverse relay, then the fan is powered and reverses, and after a certain period of time, the radiator is purged; S43, while executing step S42, the forward and reverse relays are disconnected, and the fan loses power and the speed gradually decreases over time; S44, disconnect the reverse relay and energize the forward relay. At this time, the fan is powered and resumes forward rotation.

7. A method for controlling a non-road engine forward and reverse fan according to claim 6, characterized in that: When executing step 42, if the prohibition condition is triggered, the reversal cycle stops immediately and the subsequent reversal process is executed.

8. The method for controlling a non-road engine forward and reverse fan according to claim 6, characterized in that: When executing step 43 and step 44, the reverse prohibition condition is triggered, and the reverse cycle is continued to complete.

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

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for controlling the forward and reverse fan of a non-road engine as claimed in any one of claims 1 to 8 are implemented.

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