Control method and device for engine in loading machine and loading machine

Abstract

The invention discloses a control method and device for an engine in a loading machine and the loading machine. The control method comprises the steps that the accelerator opening degree and the engine rotating speed of the loading machine are obtained; determining the operation condition of the engine at least according to the accelerator opening and the engine speed; the operation working conditions comprise a high-load working condition and a low-load working condition; when it is determined that the operation working condition is the low-load working condition, operation actions of the loader are continuously obtained; an engine control strategy corresponding to the operation action under the low-load working condition is obtained; the engine control strategy comprises a first power control curve, a smoke intensity correction curve and an accelerator correction curve; the engine is controlled to run according to the engine control strategy, so that the running state of the engine can be matched with the running working condition and the operation action, the energy consumption in the running process of the engine can be reduced, the energy consumption in the operation process of the loader can be reduced, and the operation cost of the loader can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of loader control, and in particular to a control method and device for an engine in a loader and the loader. Background Art

[0002] The engine output power is mainly used to drive the transmission system to move, and the power demand is relatively small. In addition, in addition to driving the transmission system to move, the engine power is also used to drive the hydraulic device for shoveling and lifting actions, which has a relatively large power demand.

[0003] The loader has different power requirements for the engine under different load conditions and different operating actions. If the same control strategy is used, it will cause energy waste and make the loader's operating cost higher. Summary of the invention

[0004] The invention provides a control method and device for an engine in a loader and the loader, which can reduce energy consumption and operation cost during the operation of the loader.

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

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

[0007] Determining the operating condition of the engine at least according to the throttle opening and the engine speed; the operating condition includes a high load condition and a low load condition;

[0008] When determining that the operating condition is the low-load condition, continuously acquiring the operating action of the loader;

[0009] Acquire an 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;

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

[0011] Optionally, determining the operating condition of the engine at least according to the throttle opening and the engine speed includes:

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

[0013] Optionally, determining the operating condition of the engine at least according to the throttle opening and the engine speed includes:

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

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

[0016] When the number of operation cycles is greater than a preset number, determining that the operating condition is a low-load condition;

[0017] When the number of working 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 operation cycles of the loader includes:

[0019] Continuously acquiring the operation action of the loader;

[0020] If the operation action switches from no-load forward to no-load backward, 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 switching from no-load forward to no-load backward;

[0021] The number of operation cycles of the non-standard V-type operation is determined according to the number of switching from the no-load forward operation to the no-load backward operation.

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

[0023] If the operation action is switched from no-load forward movement to shoveling, the operation type is determined to be a standard V-type operation;

[0024] The number of operation cycles of the standard V-type operation is determined according to the number of shoveling actions.

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

[0026] One operation cycle of the first type of standard V-type operation includes the following steps: forward without load, shoveling, backward with full load, forward with full load, and backward without load.

[0027] One operation cycle of the second type of standard V-type operation includes the following steps: forward without load, shoveling, backward with full load, forward with full load, backward with full load, forward with full load, and backward without load.

[0028] An operation cycle of the third type of standard V-type operation includes the following steps: moving forward without load, shoveling, moving forward with full load, and moving backward without load.

[0029] Optionally, continuously acquiring the operation action of the loader includes:

[0030] Continuously obtaining the gear change of the transmission and the speed of the loader;

[0031] When the gear change is downshifting and the vehicle speed is less than a preset vehicle speed, determining that the operation action is a shoveling action;

[0032] After the shoveling action, the operation action is determined according to the direction gear signal of the loader, the switching time interval between two adjacent direction gear signals and the vehicle speed.

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

[0034] When determining that the operating condition is the high-load condition, obtaining a second power control curve;

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

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

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

[0038] An operating condition determination module, configured to determine an operating condition of the engine at least according to the throttle opening and the engine speed; the operating condition includes a high load condition and a low load condition;

[0039] An operation action acquisition module, used for continuously acquiring the operation action of the loader when determining that the operating condition is the low-load condition;

[0040] A control strategy acquisition module, used to acquire an 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, there is provided a loader, comprising: an engine and a controller;

[0043] The controller is used to execute the above-mentioned loader control method.

[0044] The control method of the engine in the loader provided by the embodiment of the present invention continuously obtains the throttle opening and the engine speed of the loader during the operation of the loader, so that the operating condition of the engine can be determined at least based on the throttle opening and the engine speed. When the operating condition is determined to be a low-load condition, the operating action of the loader can be continuously obtained, so as to obtain an engine control strategy that matches the current low-load condition and the operating action. When the engine operation is controlled according to the engine control strategy, the operating state of the engine can be matched with the operating condition and the operating action, the energy consumption during the operation of the engine can be reduced, thereby reducing the energy consumption during the operation of the loader, which is beneficial to reducing the operating cost of the loader.

[0045] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 is a flow chart of a method for controlling an engine in a loader provided by an embodiment of the present invention;

[0048] Figure 2 is a flow chart of another method for controlling an engine in a loader provided by an embodiment of the present invention;

[0049] Figure 3 The invention is a schematic structural diagram of an engine control device in a loader provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0053] Figure 1 is a flow chart of a method for controlling an engine in a loader provided by an embodiment of the present invention. 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 obtained through the throttle opening sensor, and the throttle opening can be determined according to the throttle opening signal, so as to obtain the throttle opening of the loader. And the engine speed signal can be obtained through the speed sensor, so as to determine the engine speed according to the speed signal, so as to obtain the engine speed.

[0056] S120: Determine an engine operating condition based at least on the throttle opening and the engine speed.

[0057] The operating conditions include high load conditions and low load conditions.

[0058] Specifically, a larger throttle opening and a higher engine speed indicate that the engine has a larger power output demand, that is, the engine has a larger workload. Therefore, the engine operating condition can be detected based on the throttle opening and the engine speed.

[0059] S130: When it is determined that the operating condition is a low-load condition, continuously obtain the operating action of the loader.

[0060] Specifically, if it is determined that the loader is in a low-load operating condition, the operation of the loader can be continuously acquired under the current low-load operating condition, so as to control the engine operation according to different operating actions.

[0061] S140: Obtain an engine control strategy corresponding to the operation action under a low-load condition.

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

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

[0064] Specifically, under low-load conditions, after obtaining the working action of the loader, the engine control strategy corresponding to the determined working action under low-load conditions can be obtained, so that the engine operation can be controlled according to the engine control strategy. The engine control strategy is matched with the operating conditions of the engine and the working action of the loader, so that the operating state of the engine can be matched with the operating conditions and the working action, which can reduce the energy consumption during the operation of the engine, thereby reducing the energy consumption during the operation of the loader, which is conducive to reducing the operating cost of the loader.

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

[0066] For example, when it is determined that the operating condition of the engine is a high-load condition, a second power control curve can be obtained to control the engine operation according to the second power control curve. The second power control curve is a curve that can meet the high-load condition of the engine, and can make the output power of the engine meet the high power demand.

[0067] The control method of the engine in the loader provided by the embodiment of the present invention continuously obtains the throttle opening and the engine speed of the loader during the operation of the loader, so that the operating condition of the engine can be determined at least based on the throttle opening and the engine speed. When the operating condition is determined to be a low-load condition, the operating action of the loader can be continuously obtained, so as to obtain an engine control strategy that matches the current low-load condition and the operating action. When the engine operation is controlled according to the engine control strategy, the operating state of the engine can be matched with the operating condition and the operating action, the energy consumption during the operation of the engine can be reduced, thereby reducing the energy consumption during the operation of the loader, which is beneficial to reducing the operating cost of the loader.

[0068] Optional, Figure 2 FIG. 1 is a flow chart of another method for controlling an engine in a loader provided by an embodiment of the present invention. Figure 2 As shown, the control method of the engine in the loader includes:

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

[0070] S212, determine whether the throttle opening is greater than a preset opening and whether the engine speed is greater than a preset speed; if so, execute step S213; if not, execute step S216.

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

[0072] Specifically, the preset opening can be a certain opening value less than the maximum opening, and the preset speed can be a certain speed value less than the maximum speed, which can be set according to the definition requirements of the working condition. When the throttle opening is greater than the preset opening and the engine speed is greater than the preset speed, it means that the power demand is large, and it can be determined that the engine is in a high-load working condition. In another feasible embodiment, it can also be directly determined that the engine is in a high-load working condition when the throttle opening is greater than another larger preset opening. For example, if the throttle opening is 100% of the maximum opening, it can be directly determined that the engine is in a high-load working condition.

[0073] S214: Obtain a 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, when the conditions that the throttle opening is greater than the preset opening and the engine speed is greater than the preset speed are not met, it can be determined that the operating condition of the engine is not a high-load operating condition. That is, when the throttle opening is less than or equal to the preset opening or the engine speed is less than or equal to the preset speed, it is determined that the operating condition of the engine is not a high-load operating condition. At this time, when the throttle opening is less than or equal to the preset opening, the holding time of the throttle opening less than or equal to the preset opening can be further obtained, or when the engine speed is less than or equal to the preset speed, the holding time of the engine speed less than or equal to the preset speed can be further obtained, so as to determine whether the operating condition of the engine is a low-load operating condition according to the length of the holding time, so as to avoid the frequent switching of the operating state of the engine due to the switching of high and low load conditions, and to ensure the stability of the operating state of the engine.

[0077] The length of the holding time can be determined according to the number of operation cycles. For different types of operations, different operation actions or different execution orders of operation actions may be included, so the time taken by the loader to complete a cycle may be different. Assume that the initial stage of switching from the high-load state where the throttle opening is greater than the preset opening and the engine speed is greater than the preset speed to the throttle opening is less than or equal to the preset opening, or the engine speed is less than or equal to the preset speed is the switching stage. In the switching stage, the loader may only perform standard V-type operations, and the number of operation cycles is measured as the number of operation cycles of standard V-type operations in the switching stage; or, in the switching stage, the loader may only perform non-standard V-type operations, and the number of operation cycles is measured as the number of operation cycles of non-standard V-type operations in the switching stage; or, in the switching stage, the loader may perform standard V-type operations and non-standard V-type operations alternately, and the number of operation cycles at this time is the sum of the number of operation cycles of standard V-type operations and the number of operation cycles of non-standard V-type operations in the switching stage.

[0078] The operation type of the loader can be determined by the operation action, and then it can be determined when a work cycle is completed, and the number of work cycles can be obtained. Generally, if the current work cycle includes the operation action of shoveling, the current operation type is a standard V-type operation; if the current work cycle does not include the operation action of shoveling, the current operation type is a non-standard V-type operation.

[0079] Exemplarily, when obtaining the number of operating cycles of the loader, the operating actions of the loader can be continuously obtained; if the operating action switches from no-load forward to no-load reverse, the operating type is determined to be a non-standard V-type operation; an operating cycle of the non-standard V-type operation includes at least one switch from no-load forward to no-load reverse; the number of operating cycles of the non-standard V-type operation is determined according to the number of switches from no-load forward to no-load reverse.

[0080] Specifically, if the loader does not shovel after moving forward without load but directly moves backward without load, it means that the loader is performing a non-standard V-type operation condition that does not include shoveling action. Non-standard V-type operation can be an operation process of alternating switching between moving forward without load and moving backward without load, so non-standard V-type operation can include at least one switch from moving forward without load to moving backward without load, so the number of operation cycles of non-standard V-type operation can be determined according to the number of switches from moving forward without load to moving backward without load. Among them, the number of switches from moving forward without load to moving backward without load included in the non-standard V-type operation can be set according to the design requirements, and the embodiment of the present invention does not specifically limit this.

[0081] For example, if in the process of continuously acquiring the working action of the loader, it is identified that the working action switches from no-load forward to shoveling, the working type is determined to be a standard V-type operation; at this time, the number of working cycles of the standard V-type operation can be determined according to the number of shoveling actions. In another feasible embodiment, the number of working cycles of the quasi-V-type operation can also be determined according to the number of actions of the end action of the standard V-type operation (for example, no-load backward), or the number of switching times of two adjacent working actions in the V-type standard working condition is used as the number of working cycles of the standard V-type operation. It can be understood that a working cycle of a standard V-type operation only includes one shoveling.

[0082] In a feasible embodiment, the standard V-type operation includes the first type of standard V-type operation, the second type of standard V-type operation and the third type of standard V-type operation. Among them, one operation cycle of the first type of standard V-type operation includes the sequential execution of no-load forward, shoveling, full-load reverse, full-load forward, and no-load reverse; one operation cycle of the second type of standard V-type operation includes the sequential execution of no-load forward, shoveling, full-load reverse, full-load forward, full-load reverse, full-load forward, and no-load reverse; one operation cycle of the third type of standard V-type operation includes the sequential execution of no-load forward, shoveling, full-load forward, and no-load reverse.

[0083] Among them, in the first type of standard V-type operation, the loader moves forward from the initial unloaded state to unloaded state, and then shovels after arriving at the material point. After loading the material, it is fully loaded, and then it retreats fully loaded to distance itself from the material point and arrives at the transfer position and then moves forward fully loaded in the other direction. Then it becomes unloaded after unloading, and retreats unloaded to the transfer position for shoveling again. In the second type of standard V-type operation, during the process of retreating fully loaded after shoveling, it may not be able to retreat normally to the transfer position due to obstacles. At this time, it can execute full load forward and then continue to execute full load backward to bypass the obstacles so as to reach the transfer position. In the third type of standard V-type operation, after shoveling, the unloading position may still need to be advanced to be reached. Therefore, it can be fully loaded forward after shoveling until it retreats fully loaded after unloading to reach the material point or transfer position.

[0084] S217, determine whether the number of operation cycles is greater than the preset number; if so, execute step S218; if not, execute step S213.

[0085] S218. Determine that the operating condition is a low-load condition.

[0086] When the number of operating cycles is greater than the preset number, it means that the holding time of the switching phase is longer, and at this time it can be determined that the operating condition of the loader's engine is a low-load condition; and when the number of operating cycles is less than or equal to the preset number, it means that the holding time of the switching phase is shorter, and at this time it can be determined that the operating condition is still a high-load condition. In this way, it is possible to avoid frequent switching between high-load and low-load conditions due to the short time of the loader's switching phase, thereby avoiding frequent switching control strategies. In addition, by measuring the holding time of the switching phase through the number of operating cycles, the holding time of the switching phase can be detected while detecting the operating conditions of the loader, making the length of the holding time more flexible, and there is no need to time it separately, reducing the number of signals, which is conducive to simplifying the program and improving the response rate of the engine.

[0087] S219, continuously acquiring the operation action of the loader.

[0088] Exemplarily, when continuously acquiring the operation action of the loader, the gear change of the gearbox and the speed of the loader can be continuously acquired; when the gear change is downshift and the speed is less than the preset speed, the operation action is determined to be a shoveling action; the gear change of the gearbox is downshift, which means that it is downshifting and increasing torque at this time, and the relatively low speed means that the shoveling action is in progress, and the recognition of the shoveling action can be identified. If the shoveling action is identified, it means that the operation type at this time is a standard V-type operation condition. At this time, after the shoveling action, the operation action can be determined according to the direction gear signal of the loader, the switching time interval of the two adjacent direction gear signals and the vehicle speed. In particular, for the second type of standard V-type operation type, if the speed of the vehicle is not very high when fully loaded and reversed after shoveling and is switched to the forward gear in a short time, it can be determined that it is due to the obstacle that switches to the forward gear instead of switching to the forward gear after reaching the transfer position, and the subsequent reverse gear action corresponds to fully loaded reverse instead of unloaded reverse after unloading. Therefore, the embodiment of the present invention can accurately identify each operation action during the operation according to the directional gear signal of the loader, the switching time interval between two adjacent directional gear signals and the vehicle speed, and can identify other operation types except the first type of standard V-type operation type. The first type of standard V-type operation type is the standard V-type operation of the existing loader, that is, the embodiment of the present invention can accurately identify the unexpected actions performed in the operation cycle of the standard V-type operation type, improve the recognition accuracy of the operation action, and thus can accurately select the control strategy of the engine, so that the operating state of the engine is consistent with the actual operating conditions and action type, and can minimize the energy consumption and operation cost during the operation of the loader.

[0089] S220: Obtain an engine control strategy corresponding to the operation action under a low-load condition.

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

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

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

[0093] The control method of the engine in the loader provided by the embodiment of the present invention can accurately identify the working action of the loader, so as to determine the current working type of the loader. In this way, the corresponding working cycle can be determined according to the working type, so that it is possible to accurately judge whether the high-load working condition is switched to the low-load working condition, and it can avoid the frequent switching of the engine's operating state due to the switching of high and low working conditions, which is beneficial to ensure the stability of the engine's operating state, and can accurately identify the unexpected actions performed in the working cycle of the standard V-type working type, thereby improving the recognition accuracy of the working action, so as to accurately select the engine's control strategy, so that the engine's operating state is consistent with the actual operating condition and action type, and can minimize the energy consumption and operating cost during the operation of the loader.

[0094] Based on the same inventive concept, an embodiment of the present invention further provides a control device for an engine in a loader, which 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 an embodiment 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. The similarities can be referred to the above description of the control method for an engine in a loader provided in an embodiment of the present invention, and will not be repeated here.

[0095] Optional, Figure 3 is a schematic diagram of the structure of a control device for an engine in a loader provided by an embodiment of the present invention, such as Figure 3As shown, the control device of the engine in the loader includes: an information acquisition module 100, used to obtain the throttle opening and engine speed of the loader; an operating condition determination module 200, used to determine the operating condition of the engine at least according to the throttle opening and the engine speed; the operating condition includes a high-load condition and a low-load condition; a work action acquisition module 300, used to continuously obtain the work action of the loader when the operating condition is determined to be a low-load condition; a control strategy acquisition module 400, used to obtain the engine control strategy corresponding to the work 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; a first control module 500, used to control the engine operation according to the engine control strategy.

[0096] The control device for the engine in the loader provided by the embodiment of the present invention can match the operating state of the engine with the operating conditions and operating actions, can reduce the energy consumption during the operation of the engine, thereby reducing the energy consumption during the operation of the loader, which is beneficial to reducing the operating cost of the loader.

[0097] Optionally, the operating condition determination module includes a first high-load condition determination unit, which is used to determine that the operating condition is a high-load 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, which is used to obtain the number of working cycles of the loader when the throttle opening is less than or equal to a preset opening; or to obtain the number of working cycles of the loader when the engine speed is less than or equal to a preset speed; a low-load condition determination unit, which is used to determine that the operating condition is a low-load condition when the number of working cycles is greater than a preset number; and a second high-load condition determination unit, which is used to determine that the operating condition is a high-load condition when the number of working cycles is less than or equal to a preset number.

[0099] Optionally, the operation cycle quantity acquisition unit includes an operation action acquisition sub-unit, which is used to continuously acquire the operation action of the loader; a non-standard V-type operation determination unit, which is used to determine that the operation type is a non-standard V-type operation when the operation action switches from no-load forward to no-load reverse; an operation cycle of a non-standard V-type operation includes at least one switch from no-load forward to no-load reverse; a first operation cycle quantity determination sub-unit, which is used to determine the number of operation cycles of the non-standard V-type operation according to the number of switches from no-load forward to no-load reverse.

[0100] Optionally, the operation cycle quantity acquisition unit also includes a standard V-type operation determination unit, which is used to determine the operation type as a standard V-type operation when the operation action switches from no-load forward to shoveling; a second operation cycle quantity determination subunit, which is used to determine the number of operation cycles of the standard V-type operation according to the number of shoveling and loading actions.

[0101] Optionally, standard V-type operations include first-category standard V-type operations, second-category standard V-type operations and third-category standard V-type operations; an operation cycle of the first-category standard V-type operation includes the sequential execution of empty-load forward, shoveling, full-load reverse, full-load forward, and empty-load reverse; an operation cycle of the second-category standard V-type operation includes the sequential execution of empty-load forward, shoveling, full-load reverse, full-load forward, full-load reverse, full-load forward, and empty-load reverse; an operation cycle of the third-category standard V-type operation includes the sequential execution of empty-load forward, shoveling, full-load forward, and empty-load reverse.

[0102] Optionally, the operation action acquisition module and the operation action acquisition sub-unit include an information acquisition unit, which is used to continuously acquire the gear change of the transmission and the vehicle speed of the loader; a shoveling action determination unit, which is used to determine that the operation action is a shoveling action when the gear change is a downshift and the vehicle speed is less than a preset speed; and an operation action determination unit, which is used to determine the operation action after the shoveling action according to the loader's direction gear signal, the switching time interval between two adjacent direction gear signals, and the vehicle speed.

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

[0104] Based on the same inventive concept, an embodiment of the present invention further provides a loader, including an engine and a controller, wherein the controller is used to execute the control method of the engine in the loader provided by any embodiment of the present invention. Therefore, the loader provided by the embodiment of the present invention includes the technical features of the control method of the engine in the loader provided by any embodiment of the present invention, and can achieve the beneficial effects of the control method of the engine in the loader provided by any embodiment of the present invention. The similarities can be referred to the above description of the control method of the engine in the loader provided by the embodiment 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 to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling an engine in a loader, characterized in that: include: Obtaining the throttle opening and engine speed of the loader; Determining the operating condition of the engine at least based on the throttle opening and the engine speed; The operating conditions include high load conditions and low load conditions; When determining that the operating condition is the low-load condition, continuously acquiring the operating action of the loader; Acquire an 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 engine operation is controlled according to the engine control strategy.

2. The method for controlling an engine in a loader according to claim 1, characterized in that: Determining the operating condition of the engine at least according to 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, it is determined that the operating condition is a high-load condition.

3. The method for controlling an engine in a loader according to claim 1, characterized in that: Determining the operating condition of the engine at least according to the throttle opening and the engine speed includes: When the throttle opening is less than or equal to a preset opening, obtaining the number of operation cycles of the loader; Alternatively, when the engine speed is less than or equal to a preset speed, the number of operation cycles of the loader is obtained; When the number of operation cycles is greater than a preset number, determining that the operating condition is a low-load condition; When the number of working cycles is less than or equal to the preset number, the operating condition is determined to be a high-load condition.

4. The method for controlling an engine in a loader according to claim 3, characterized in that: Obtaining the number of operation cycles of the loader, including: Continuously acquiring the operation action of the loader; If the operation action switches from no-load forward to no-load backward, 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 switching from no-load forward to no-load backward; The number of operation cycles of the non-standard V-type operation is determined according to the number of switching from the no-load forward operation to the no-load backward operation.

5. The method for controlling an engine in a loader according to claim 4, characterized in that: Obtaining the number of operation cycles of the loader also includes: If the operation action is switched from no-load forward movement to shoveling, the operation type is determined to be a standard V-type operation; The number of operation cycles of the standard V-type operation is determined according to the number of shoveling actions.

6. The method for controlling an engine in a loader according to claim 5, characterized in that: The standard V-type operation includes the first type of standard V-type operation, the second type of standard V-type operation and the third type of standard V-type operation; One operation cycle of the first type of standard V-type operation includes the following steps: forward without load, shoveling, backward with full load, forward with full load, and backward without load. One operation cycle of the second type of standard V-type operation includes the following steps: forward without load, shoveling, backward with full load, forward with full load, backward with full load, forward with full load, and backward without load. An operation cycle of the third type of standard V-type operation includes the following steps: moving forward without load, shoveling, moving forward with full load, and moving backward without load.

7. The method for controlling an engine in a loader according to claim 1 or 4, characterized in that: Continuously obtaining the operation action of the loader, including: Continuously obtaining the gear change of the transmission and the speed of the loader; When the gear change is downshifting and the vehicle speed is less than a preset vehicle speed, determining that the operation action is a shoveling action; After the shoveling action, the operation action is determined according to the direction gear signal of the loader, the switching time interval between two adjacent direction gear signals and the vehicle speed.

8. The method for controlling an engine in a loader according to claim 1, characterized in that: Also includes: When determining that the operating condition is the high-load condition, obtaining a second power control curve; The engine operation is controlled according to the second power control curve.

9. A control device for an engine in a loader, characterized in that: include: An information acquisition module, used to acquire the throttle opening and engine speed of the loader; An operating condition determination module, configured to determine an engine operating condition based at least on the throttle opening and the engine speed; The operating conditions include high load conditions and low load conditions; An operation action acquisition module, used for continuously acquiring the operation action of the loader when determining that the operating condition is the low-load condition; A control strategy acquisition module, used to acquire an 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 operation of the engine according to the engine control strategy.

10. A loader, characterized in that: include: Engines and controllers; The controller is used to execute the control method of the loader according to any one of claims 1 to 8.

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