A control method and device for an engine in a loader and a loader

Abstract

The application discloses a loader engine control method and device and a loader, and relates to the technical field of loaders, and can reduce energy consumption during operation of the engine and during operation of the loader, and can reduce operation cost of the loader.

Description

Technical Field

[0001] This invention relates to the field of loader control technology, and in particular to a control method, device, and loader for an engine in a loader. Background Technology

[0002] The engine's output power is mainly used to drive the transmission system, requiring relatively little power. In addition, besides driving the transmission system, the engine power is also used to drive the hydraulic device for loading and lifting operations, requiring a larger power.

[0003] Loaders have different power requirements for their engines under different load conditions and different operating actions. Using the same control strategy would result in energy waste and higher operating costs for loaders. Summary of the Invention

[0004] This invention provides a method, device, and loader for controlling the engine in a loader, which can reduce energy consumption and operating costs during loader operation.

[0005] According to one aspect of the present invention, a method for controlling an engine in a loader is provided, comprising:

[0006] Obtain the throttle opening and engine speed of the loader;

[0007] The engine operating conditions are determined at least based on the throttle opening and the engine speed; the operating conditions include high-load conditions and low-load conditions.

[0008] When the operating condition is determined to be the low-load condition, the operation actions of the loader are continuously acquired;

[0009] Under the low-load condition, obtain the engine control strategy corresponding to the operation action; the engine control strategy includes a first power control curve, a smoke correction curve, and a throttle correction curve.

[0010] The engine is controlled to operate according to the engine control strategy.

[0011] Optionally, the engine operating conditions are determined at least based on the throttle opening and the engine speed, including:

[0012] When the throttle opening is greater than a preset opening and the engine speed is greater than a preset speed, the operating condition is determined to be a high-load condition.

[0013] Optionally, the engine operating conditions are determined at least based on the throttle opening and the engine speed, including:

[0014] When the throttle opening is less than or equal to a preset opening, the number of working cycles of the loader is obtained;

[0015] Alternatively, when the engine speed is less than or equal to a preset speed, the number of working cycles of the loader can be obtained;

[0016] When the number of work cycles is greater than a preset number, the operating condition is determined to be a low-load condition.

[0017] When the number of work cycles is less than or equal to the preset number, the operating condition is determined to be a high-load condition.

[0018] Optionally, obtaining the number of work cycles of the loader includes:

[0019] Continuously acquire the operating actions of the loader;

[0020] If the operation action changes from forward movement to backward movement, the operation type is determined to be a non-standard V-type operation; one operation cycle of the non-standard V-type operation includes at least one switch from forward movement to backward movement.

[0021] The number of operation cycles for the non-standard V-shaped operation is determined based on the number of times the operation switches between no-load forward and no-load backward.

[0022] Optionally, obtaining the number of work cycles of the loader further includes:

[0023] If the operation action is switched from unloaded forward movement to loading, then the operation type is determined to be a standard V-type operation;

[0024] The number of operation cycles for the standard V-shaped operation is determined based on the number of shoveling actions.

[0025] Optionally, the standard V-shaped operation includes a first type of standard V-shaped operation, a second type of standard V-shaped operation, and a third type of standard V-shaped operation;

[0026] The first type of standard V-shaped operation consists of a work cycle that is executed sequentially as follows: unloaded forward, loading, fully loaded backward, fully loaded forward, and unloaded backward.

[0027] One work cycle of the second type of standard V-type operation includes the following sequential actions: unloaded forward, loading, fully loaded backward, fully loaded forward, fully loaded backward, fully loaded forward, and unloaded backward.

[0028] One work cycle of the third type of standard V-shaped operation includes sequentially executing unloaded forward movement, loading, fully loaded forward movement, and unloaded reverse movement.

[0029] Optionally, continuously acquiring the loader's operating actions includes:

[0030] Continuously acquire information on gear changes in the transmission and the speed of the loader;

[0031] When the gear change is downshifting and the vehicle speed is less than the preset vehicle speed, the operation is determined to be a shoveling operation;

[0032] After the loading action, the operation is determined based on the loader's direction gear signal, the switching time interval between two adjacent direction gear signals, and the vehicle speed.

[0033] Optionally, the engine control method in the loader further includes:

[0034] When the operating condition is determined to be the high-load condition, a second power control curve is obtained;

[0035] The engine is controlled to operate according to the second power control curve.

[0036] According to another aspect of the present invention, a control device for an engine in a loader is provided, comprising:

[0037] The information acquisition module is used to acquire the throttle opening and engine speed of the loader;

[0038] The operating condition determination module is used to determine the engine's operating condition based at least on the throttle opening and the engine speed; the operating condition includes high load condition and low load condition;

[0039] The operation action acquisition module is used to continuously acquire the operation actions of the loader when the operating condition is determined to be the low load condition.

[0040] The control strategy acquisition module is used to acquire the engine control strategy corresponding to the operation action under the low load condition; the engine control strategy includes a first power control curve, a smoke correction curve, and a throttle correction curve.

[0041] The first control module is used to control the operation of the engine according to the engine control strategy.

[0042] According to another aspect of the present invention, a loader is provided, comprising: an engine and a controller;

[0043] The controller is used to execute the control method for the loader described above.

[0044] The engine control method for a loader provided in this invention continuously acquires the throttle opening and engine speed of the loader during operation. This allows for the determination of the engine's operating condition based at least on the throttle opening and engine speed. When the operating condition is determined to be a low-load condition, the loader's operational actions can be continuously acquired. This allows for the acquisition of an engine control strategy that matches the current low-load condition and operational actions. By controlling the engine operation according to this strategy, the engine's operating state can be matched with the operating condition and operational actions, reducing energy consumption during engine operation and thus lowering the energy consumption during loader operation, which is beneficial for reducing the loader's operating costs.

[0045] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flowchart of a control method for an engine in a loader provided by an embodiment of the present invention;

[0048] Figure 2 This is a flowchart of another engine control method in a loader provided by an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of a control device for an engine in a loader provided in an embodiment of the present invention. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] This invention provides a method for controlling the engine in a loader, which can reduce energy consumption and operating costs during loader operation. This method for controlling the engine in a loader can be executed by a control device for the engine in a loader provided in this invention. The control device for the engine in a loader can be implemented in the form of software and / or hardware, and the control device for the engine in a loader can be configured in the controller of the loader.

[0053] Figure 1 This is a flowchart of a control method for an engine in a loader provided by an embodiment of the present invention, such as... Figure 1 As shown, the method includes:

[0054] S110: Obtain the throttle opening and engine speed of the loader.

[0055] Specifically, the throttle opening signal can be acquired through a throttle opening sensor, and the throttle opening can be determined based on this signal, thus enabling the acquisition of the throttle opening of the loader. Furthermore, the engine speed signal can be acquired through a speed sensor, and the engine speed can be determined based on this signal, thus enabling the acquisition of the engine speed.

[0056] S120. Determine the engine's operating conditions based at least on the throttle opening and engine speed.

[0057] Operating conditions include high-load conditions and low-load conditions.

[0058] Specifically, a larger throttle opening and a higher engine speed indicate a greater demand for engine power output, meaning a higher engine workload. Therefore, the engine's operating condition can be assessed based on the throttle opening and engine speed.

[0059] S130. When the operating condition is determined to be a low-load condition, continuously acquire the loader's operating actions.

[0060] Specifically, if it is determined that the loader is operating under low load conditions, the loader's work can be continuously acquired under the current low load conditions so as to control the engine operation according to different work actions.

[0061] S140. Obtain the engine control strategy corresponding to the operation action under low load conditions.

[0062] The engine control strategy includes the first power control curve, the smoke correction curve, and the throttle correction curve.

[0063] S150: Control engine operation according to engine control strategy.

[0064] Specifically, under low-load conditions, after acquiring the loader's operating actions, the engine control strategy corresponding to the determined operating actions under low-load conditions can be obtained. This allows for engine operation control based on the engine control strategy. Matching the engine control strategy with the engine's operating conditions and the loader's operating actions ensures that the engine's operating state is aligned with these conditions and actions, reducing energy consumption during engine operation and consequently lowering the loader's energy consumption during operation, thus contributing to lower operating costs.

[0065] Among them, the engine control strategy corresponding to the operation under low load conditions includes the first power control curve, smoke correction curve and throttle correction curve, which can be calibrated through testing so that each operation under low load conditions has a corresponding matching first power control curve, smoke correction curve and throttle correction curve. When the engine is controlled according to the above control strategy, energy consumption and loader operating costs can be reduced to the greatest extent.

[0066] For example, when the engine's operating condition is determined to be a high-load condition, a second power control curve can be obtained to control the engine's operation according to the second power control curve. The second power control curve is a curve that can meet the engine's high-load operating conditions, enabling the engine's output power to meet high power demands.

[0067] The engine control method for a loader provided in this invention continuously acquires the throttle opening and engine speed of the loader during operation. This allows for the determination of the engine's operating condition based at least on the throttle opening and engine speed. When the operating condition is determined to be a low-load condition, the loader's operational actions can be continuously acquired. This allows for the acquisition of an engine control strategy that matches the current low-load condition and operational actions. By controlling the engine operation according to this strategy, the engine's operating state can be matched with the operating condition and operational actions, reducing energy consumption during engine operation and thus lowering the energy consumption during loader operation, which is beneficial for reducing the loader's operating costs.

[0068] Optional, Figure 2 This is a flowchart of another engine control method in a loader provided by an embodiment of the present invention, such as... Figure 2 As shown, the engine control method in this loader includes:

[0069] S211. Obtain the throttle opening and engine speed of the loader.

[0070] S212. Determine whether the throttle opening is greater than the preset opening and whether the engine speed is greater than the preset speed; if yes, proceed to step S213; if no, proceed to step S216.

[0071] S213. Determine the operating condition as a high-load condition.

[0072] Specifically, the preset throttle opening can be a value less than the maximum opening, and the preset engine speed can be a value less than the maximum engine speed; these can be set according to the requirements of the operating conditions. When the throttle opening is greater than the preset opening and the engine speed is greater than the preset speed, it indicates a high power demand, and the engine can be determined to be under high load. In another feasible embodiment, the engine can also be directly determined to be under high load when the throttle opening is greater than another larger preset opening; for example, if the throttle opening is 100% of the maximum opening, the engine can be directly determined to be under high load.

[0073] S214. Obtain the second power control curve.

[0074] S215. Control the engine operation according to the second power control curve.

[0075] S216. Obtain the number of operation cycles of the loader.

[0076] Specifically, if the conditions of both throttle opening greater than a preset opening and engine speed greater than a preset speed are not met, it can be determined that the engine is not operating under high load. That is, if the throttle opening is less than or equal to a preset opening or the engine speed is less than or equal to a preset speed, the engine is not operating under high load. In this case, the duration for which the throttle opening is less than or equal to the preset opening, or the duration for which the engine speed is less than or equal to the preset speed, can be further measured. The length of this duration determines whether the engine is operating under low load. This avoids frequent switching of the engine's operating state due to high and low load conditions, ensuring the stability of the engine's operating state.

[0077] The duration of the hold time can be determined based on the number of work cycles. Different work types may involve different work actions or different execution sequences, therefore the time taken for the loader to complete one work cycle may vary. Assume the initial stage of switching from a high-load state where the throttle opening is greater than a preset opening and the engine speed is greater than a preset speed to a state where the throttle opening is less than or equal to a preset opening, or the engine speed is less than or equal to a preset speed, is the switching stage. During the switching stage, the loader may only perform standard V-type operations, in which case the number of work cycles is the number of standard V-type operations during the switching stage; or, the loader may only perform non-standard V-type operations, in which case the number of work cycles is the number of non-standard V-type operations during the switching stage; or, the loader may alternate between standard and non-standard V-type operations during the switching stage, in which case the number of work cycles is the sum of the number of standard and non-standard V-type operations during the switching stage.

[0078] The type of work performed by the loader can be determined by the work actions, which in turn determines when a work cycle is completed and allows for the acquisition of the number of work cycles. Generally, if the current work cycle includes loading actions, the current work type is a standard V-type work; if the current work cycle does not include loading actions, the current work type is a non-standard V-type work.

[0079] For example, when obtaining the number of work cycles of the loader, the work actions of the loader can be continuously obtained; if the work action changes from unloaded forward to unloaded backward, the work type is determined to be non-standard V-type work; one work cycle of non-standard V-type work includes at least one switch from unloaded forward to unloaded backward; the number of work cycles of non-standard V-type work is determined according to the number of switches from unloaded forward to unloaded backward.

[0080] Specifically, if the loader moves forward without loading and then immediately reverses without loading, it indicates that the loader is performing a non-standard V-shaped working condition that does not include loading. A non-standard V-shaped working condition can be a process that alternates between moving forward and reversing without loading. Therefore, a non-standard V-shaped working condition may include at least one switch from forward to reverse without loading. The number of such switches can be used to determine the number of work cycles in a non-standard V-shaped working condition. The number of forward-to-reverse switches in a non-standard V-shaped working condition can be set according to design requirements; this embodiment of the invention does not impose specific limitations on this.

[0081] For example, if, during the continuous acquisition of the loader's operational actions, a switch from unloaded forward movement to loading is detected, the operational type is determined to be a standard V-type operation. In this case, the number of operation cycles for the standard V-type operation can be determined based on the number of loading actions. In another feasible embodiment, the number of operation cycles for the quasi-V-type operation can also be determined based on the number of ending actions (e.g., unloaded reverse movement) of the standard V-type operation, or the number of switching actions between two adjacent operational actions in a standard V-type operation can be used as the number of operation cycles for the standard V-type operation. It is understood that a standard V-type operation cycle includes only one loading action.

[0082] In one feasible embodiment, the standard V-shaped operation includes a first type of standard V-shaped operation, a second type of standard V-shaped operation, and a third type of standard V-shaped operation. Specifically, one cycle of the first type of standard V-shaped operation includes the sequential execution of: unloaded forward, loading, fully loaded backward, fully loaded forward, and unloaded backward; one cycle of the second type of standard V-shaped operation includes the sequential execution of: unloaded forward, loading, fully loaded backward, fully loaded forward, fully loaded backward, fully loaded forward, and unloaded backward; and one cycle of the third type of standard V-shaped operation includes the sequential execution of: unloaded forward, loading, fully loaded forward, and unloaded backward.

[0083] In the first type of standard V-shaped operation, the loader initially moves forward unloaded, then proceeds to the material point to load material, becoming fully loaded. It then reverses fully loaded to create distance from the material point, reaches a transfer position, and then moves forward fully loaded in the other direction. After unloading, it becomes unloaded again, reverses unloaded to the transfer position, and can then load material again. In the second type of standard V-shaped operation, during the fully loaded reversal after loading, obstacles may prevent normal reversal to the transfer position. In this case, a fully loaded forward movement can be performed to continue reversing fully loaded to bypass the obstacles and reach the transfer position. In the third type of standard V-shaped operation, the unloading point may still require further movement after loading. Therefore, a fully loaded forward movement can be performed after loading until unloading, followed by a fully loaded reversal to reach the material point or transfer position.

[0084] S217. Determine whether the number of job cycles is greater than the preset number; if yes, proceed to step S218; if no, proceed to step S213.

[0085] S218. Determine the operating condition as low load condition.

[0086] When the number of work cycles exceeds the preset number, it indicates a longer hold time in the switching phase, confirming that the loader's engine is operating under low load. Conversely, when the number of work cycles is less than or equal to the preset number, it indicates a shorter hold time in the switching phase, confirming a higher load. This avoids frequent switching between high and low load conditions due to short switching phases, thus preventing the need for frequent switching control strategies. Furthermore, measuring the hold time in the switching phase by the number of work cycles allows for simultaneous monitoring of the loader's operational status and the hold time itself. This provides greater flexibility in the hold time duration, eliminates the need for separate timing, reduces the number of signals, simplifies the programming, and improves the engine's response rate.

[0087] S219. Continuously acquire the loader's operating actions.

[0088] For example, while continuously acquiring the loader's operating actions, the gear shift information of the transmission and the loader's speed can be continuously acquired. When the gear shift is downshifting and the speed is less than the preset speed, the operating action is determined to be a shoveling action. A downshifting transmission indicates that a downshift is increasing torque, and a relatively low speed indicates that a shoveling action is in progress, thus enabling the identification of the shoveling action. If a shoveling action is identified, it indicates that the current operating type is a standard V-type operating condition. In this case, after the shoveling action, the operating action can be determined based on the loader's direction gear signal, the switching time interval between two adjacent direction gear signals, and the vehicle speed. Especially for the second type of standard V-type operating condition, if the vehicle speed is not very high during the fully loaded reverse after shoveling and switches to forward gear in a short time, it can be determined that the shift to forward gear is due to an obstacle rather than after reaching the turning position. Therefore, the subsequent reverse gear action corresponds to a fully loaded reverse rather than an unloaded reverse after unloading. Therefore, this embodiment of the invention can accurately identify various operational actions during operation based on the loader's direction gear signal, the switching time interval between two adjacent direction gear signals, and the vehicle speed. It can identify operational types other than the first type of standard V-shaped operation. The first type of standard V-shaped operation refers to the existing standard V-shaped operation of loaders. This embodiment of the invention can accurately identify unexpected actions performed in the operation cycle of the standard V-shaped operation type, improving the accuracy of action identification. This allows for precise selection of the engine control strategy, ensuring that the engine's operating state matches the actual operating conditions and action type, thereby minimizing energy consumption and operating costs during loader operation.

[0089] S220: Obtain the engine control strategy corresponding to the operation action under low load conditions.

[0090] The engine control strategy includes the first power control curve, the smoke correction curve, and the throttle correction curve.

[0091] S221. Control engine operation according to engine control strategy.

[0092] For example, under high-load conditions, the operation actions can be identified and detected in real time. The relevant gear information, vehicle speed information, time information and operation action identification results can be stored for data analysis.

[0093] The engine control method for a loader provided in this invention can accurately identify the loader's operating actions, thereby determining the current operating type of the loader. This allows for the determination of the corresponding operating cycle based on the operating type, enabling accurate judgment of whether a high-load condition transition is a low-load condition. This avoids frequent switching of the engine's operating state due to high and low load conditions, thus ensuring the stability of the engine's operating state. Furthermore, it can accurately identify unexpected actions in a standard V-type operating cycle, improving the accuracy of action identification. This allows for precise selection of the engine control strategy, ensuring that the engine's operating state matches the actual operating conditions and action type, thereby minimizing energy consumption and operating costs during loader operation.

[0094] Based on the same inventive concept, embodiments of the present invention also provide a control device for an engine in a loader. This control device is used to execute the control method for an engine in a loader provided in any embodiment of the present invention. The control device for an engine in a loader can be implemented by software and / or hardware. Therefore, the control device for an engine in a loader provided in the embodiments of the present invention includes the technical features of the control method for an engine in a loader provided in any embodiment of the present invention, and can achieve the beneficial effects of the control method for an engine in a loader provided in any embodiment of the present invention. Similarities can be referred to the above description of the control method for an engine in a loader provided in the embodiments of the present invention, and will not be repeated here.

[0095] Optional, Figure 3 This is a schematic diagram of the structure of a control device for an engine in a loader provided in an embodiment of the present invention, as shown below. Figure 3As shown, the engine control device in the loader includes: an information acquisition module 100 for acquiring the throttle opening and engine speed of the loader; an operating condition determination module 200 for determining the engine's operating condition based at least on the throttle opening and engine speed; the operating conditions include high-load conditions and low-load conditions; a work action acquisition module 300 for continuously acquiring the loader's work actions when the operating condition is determined to be low-load conditions; a control strategy acquisition module 400 for acquiring the engine control strategy corresponding to the work actions under low-load conditions; the engine control strategy includes a first power control curve, a smoke correction curve, and a throttle correction curve; and a first control module 500 for controlling the engine operation according to the engine control strategy.

[0096] The engine control device in the loader provided in this embodiment of the invention can match the engine's operating state with the operating conditions and work actions, reduce the energy consumption during engine operation, thereby reducing the energy consumption of the loader during operation and helping to reduce the operating cost of the loader.

[0097] Optionally, the operating condition determination module includes a first high-load operating condition determination unit, used to determine the operating condition as a high-load operating condition when the throttle opening is greater than a preset opening and the engine speed is greater than a preset speed.

[0098] Optionally, the operating condition determination module includes a work cycle number acquisition unit, used to acquire the number of work cycles of the loader when the throttle opening is less than or equal to a preset opening; or, when the engine speed is less than or equal to a preset speed; a low load condition determination unit, used to determine the operating condition as a low load condition when the number of work cycles is greater than a preset number; and a second high load condition determination unit, used to determine the operating condition as a high load condition when the number of work cycles is less than or equal to a preset number.

[0099] Optionally, the work cycle quantity acquisition unit includes a work action acquisition subunit for continuously acquiring the work actions of the loader; a non-standard V-type work determination unit for determining the work type as non-standard V-type work when the work action switches from unloaded forward to unloaded backward; one work cycle of non-standard V-type work includes at least one switch from unloaded forward to unloaded backward; and a first work cycle quantity determination subunit for determining the number of work cycles of non-standard V-type work based on the number of switches from unloaded forward to unloaded backward.

[0100] Optionally, the work cycle number acquisition unit also includes a standard V-type work determination unit, used to determine the work type as standard V-type work when the work action switches from unloaded forward movement to loading; and a second work cycle number determination subunit, used to determine the number of work cycles of standard V-type work based on the number of loading actions.

[0101] Optionally, standard V-shaped operations include Category I, Category II, and Category III standard V-shaped operations; a single cycle of a Category I standard V-shaped operation includes the sequential execution of unloaded forward movement, loading, fully loaded backward movement, fully loaded forward movement, and unloaded backward movement; a single cycle of a Category II standard V-shaped operation includes the sequential execution of unloaded forward movement, loading, fully loaded backward movement, fully loaded forward movement, fully loaded backward movement, fully loaded forward movement, and unloaded backward movement; a single cycle of a Category III standard V-shaped operation includes the sequential execution of unloaded forward movement, loading, fully loaded forward movement, and unloaded backward movement.

[0102] Optionally, the operation action acquisition module and the operation action acquisition subunit include an information acquisition unit for continuously acquiring the gear changes of the transmission and the speed of the loader; a shoveling action determination unit for determining the operation action as a shoveling action when the gear change is downshifting and the speed is less than the preset speed; and an operation action determination unit for determining the operation action after the shoveling action based on the loader's direction gear signal, the switching time interval between two adjacent direction gear signals, and the speed.

[0103] Optionally, the engine control device in the carrier aircraft also includes a second power control curve acquisition module, used to acquire a second power control curve when the operating condition is determined to be a high-load condition; and a second control module, used to control the engine operation according to the second power control curve.

[0104] Based on the same inventive concept, embodiments of the present invention also provide a loader, including an engine and a controller. The controller is used to execute the engine control method of the loader provided in any embodiment of the present invention. Therefore, the loader provided in the embodiments of the present invention includes the technical features of the engine control method of the loader provided in any embodiment of the present invention, and can achieve the beneficial effects of the engine control method of the loader provided in any embodiment of the present invention. The similarities can be referred to the above description of the engine control method of the loader provided in the embodiments of the present invention, and will not be repeated here.

[0105] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0106] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling an engine in a loader, characterized in that, include: Obtain the throttle opening and engine speed of the loader; The engine operating conditions are determined at least based on the throttle opening and the engine speed; The operating conditions include high-load conditions and low-load conditions; When the operating condition is determined to be the low-load condition, the operation actions of the loader are continuously acquired; Under the low-load condition, obtain the engine control strategy corresponding to the operation action; the engine control strategy includes a first power control curve, a smoke correction curve, and a throttle correction curve. The engine is controlled to operate according to the engine control strategy; The determination of the engine's operating conditions, at least based on the throttle opening and the engine speed, includes: When the throttle opening is less than or equal to a preset opening, the number of working cycles of the loader is obtained; or, when the engine speed is less than or equal to a preset speed, the number of working cycles of the loader is obtained. When the number of work cycles is greater than a preset number, the operating condition is determined to be a low-load condition. When the number of work cycles is less than or equal to the preset number, the operating condition is determined to be a high-load condition.

2. The engine control method in a loader according to claim 1, characterized in that, Determining the engine's operating conditions based at least on the throttle opening and the engine speed includes: When the throttle opening is greater than a preset opening and the engine speed is greater than a preset speed, the operating condition is determined to be a high-load condition.

3. The engine control method in a loader according to claim 1, characterized in that, Obtaining the number of operation cycles of the loader includes: Continuously acquire the operating actions of the loader; If the operation action changes from forward movement to backward movement, the operation type is determined to be a non-standard V-type operation; one operation cycle of the non-standard V-type operation includes at least one switch from forward movement to backward movement. The number of operation cycles for the non-standard V-shaped operation is determined based on the number of times the operation switches between no-load forward and no-load backward.

4. The engine control method in a loader according to claim 3, characterized in that, Obtaining the number of operation cycles of the loader also includes: If the operation action is switched from unloaded forward movement to loading, then the operation type is determined to be a standard V-type operation; The number of operation cycles for the standard V-shaped operation is determined based on the number of shoveling actions.

5. The engine control method in a loader according to claim 4, characterized in that, The standard V-shaped operation includes the first type of standard V-shaped operation, the second type of standard V-shaped operation, and the third type of standard V-shaped operation; The first type of standard V-shaped operation consists of a work cycle that is executed sequentially as follows: unloaded forward, loading, fully loaded backward, fully loaded forward, and unloaded backward. One work cycle of the second type of standard V-type operation includes the following sequential actions: unloaded forward, loading, fully loaded backward, fully loaded forward, fully loaded backward, fully loaded forward, and unloaded backward. One work cycle of the third type of standard V-shaped operation includes sequentially executing unloaded forward movement, loading, fully loaded forward movement, and unloaded reverse movement.

6. The method for controlling the engine in a loader according to claim 1 or 3, characterized in that, Continuously acquire the operating actions of the loader, including: Continuously acquire information on gear changes in the transmission and the speed of the loader; When the gear change is downshifting and the vehicle speed is less than the preset vehicle speed, the operation is determined to be a shoveling operation; After the loading action, the operation is determined based on the loader's direction gear signal, the switching time interval between two adjacent direction gear signals, and the vehicle speed.

7. The engine control method in a loader according to claim 1, characterized in that, Also includes: When the operating condition is determined to be the high-load condition, a second power control curve is obtained; The engine is controlled to operate according to the second power control curve.

8. A control device for an engine in a loader, characterized in that, include: The information acquisition module is used to acquire the throttle opening and engine speed of the loader; The operating condition determination module is used to determine the engine's operating condition based at least on the throttle opening and the engine speed; The operating conditions include high-load conditions and low-load conditions; The operation action acquisition module is used to continuously acquire the operation actions of the loader when the operating condition is determined to be the low load condition. The control strategy acquisition module is used to acquire the engine control strategy corresponding to the operation action under the low load condition; the engine control strategy includes a first power control curve, a smoke correction curve, and a throttle correction curve. The first control module is used to control the engine operation according to the engine control strategy; The operating condition determination module includes a work cycle number acquisition unit, used to acquire the number of work cycles of the loader when the throttle opening is less than or equal to a preset opening; or, to acquire the number of work cycles of the loader when the engine speed is less than or equal to a preset speed; a low load condition determination unit, used to determine the operating condition as a low load condition when the number of work cycles is greater than a preset number; and a second high load condition determination unit, used to determine the operating condition as a high load condition when the number of work cycles is less than or equal to the preset number.

9. A loader, characterized in that, include: Engine and controller; The controller is used to execute the control method of the loader according to any one of claims 1 to 7.

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