Control method of engine start, working machine, and electronic device

Abstract

The application relates to the technical field of engine control, and provides an engine starting control method, a working machine and electronic equipment. The engine starting control method comprises the following steps: receiving a starting signal; acquiring a first load, a second load and a maximum load of a starter, wherein the starter is used for starting the engine, the first load is the load of the body of the engine, and the second load is the hydraulic load of a hydraulic pump on the engine under a current working condition; determining that the sum of the first load and the second load is greater than the maximum load, controlling the second load to be reduced to a target load, so that the sum of the first load and the target load is less than or equal to the maximum load; and sending an execution signal, which is used for controlling the starter to start the engine. The engine starting control method provided by the application can determine whether the engine can be started by comparing the actual load of the engine with the maximum load of the starter, and if the engine cannot be started, the load of the hydraulic pump on the engine can be adjusted to ensure that the starter can stably start the engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine control, and in particular to an engine starting control method, a working machine and an electronic device. BACKGROUND

[0002] In related technologies, a working machine driven by hydraulic pressure, such as an excavator, a crane, a pile driver, etc., starts an engine by a starter, and the engine transmits mechanical energy to a hydraulic pump to realize power output. Taking a hydraulic excavator as an example, the hydraulic pump of the hydraulic excavator is connected with the engine through a shaft coupling. In the starting process, the starting load of the starter includes the load of the engine itself and the load of the hydraulic pump. In the case of low ambient temperature (which can be understood as a low-temperature environment), the oil temperature of the hydraulic oil in the hydraulic pump is low, the viscosity of the hydraulic oil is large, the flow resistance of the hydraulic oil is large, and the starting load of the hydraulic pump is large, that is, the hydraulic load of the hydraulic pump on the engine is large, which results in a large load of the starter and increases the starting difficulty. SUMMARY

[0003] The present application provides an engine starting control method to solve the defects of large load of the engine on the starter and large starting difficulty in the prior art. By comparing the actual load of the engine with the maximum load of the starter, it is determined whether the engine can be started. If not, the load of the hydraulic pump on the engine is adjusted to ensure that the starter can stably start the engine.

[0004] The present application provides an engine starting control method, comprising:

[0005] receiving a starting signal;

[0006] obtaining a first load, a second load and a maximum load of a starter, wherein the starter is used to start an engine, the first load is the load of the body of the engine, and the second load is the hydraulic load of a hydraulic pump on the engine under a current working condition;

[0007] determining that the sum of the first load and the second load is greater than the maximum load, controlling the second load to decrease to a target load, so that the sum of the first load and the target load is less than or equal to the maximum load;

[0008] sending an execution signal, the execution signal being used to control the starter to start the engine.

[0009] According to the engine starting control method provided by the present application, the control of the second load to decrease to a target load is to decrease the displacement of the hydraulic pump and control the second load to decrease to the target load.

[0010] According to the engine starting control method provided by the present application, after the step of sending the execution signal, the method further comprises:

[0011] determining that the engine starting is successful;

[0012] controlling the electromagnetic valve of the hydraulic pump to adjust the displacement of the hydraulic pump to the displacement required by the current working mode.

[0013] According to the engine starting control method provided by the present application, the step of determining that the engine starting is successful comprises:

[0014] obtaining the starting speed and the current speed of the output shaft of the engine;

[0015] determining that the engine starting is successful based on that the current speed is greater than or equal to the starting speed.

[0016] According to the engine starting control method provided by the present application, the step of controlling the second load to reduce to the target load comprises:

[0017] based on that the hydraulic pump is provided with a bypass oil path communicated with the hydraulic cylinder, controlling the hydraulic oil in the hydraulic cylinder to be shunted to the bypass oil path, so that the load of the hydraulic pump is reduced to the target load.

[0018] According to the engine starting control method provided by the present application, the target load is the minimum load of the hydraulic pump.

[0019] According to the engine starting control method provided by the present application, the current working condition comprises at least one of the current environmental temperature, the current temperature of the hydraulic oil in the hydraulic pump and the set working mode.

[0020] The present application further provides a working machine, comprising:

[0021] an engine;

[0022] a starter connected to the engine and used for starting the engine;

[0023] a hydraulic pump connected to the engine;

[0024] a controller used for executing the engine starting control method according to any one of the above;

[0025] a detection device used for obtaining the working parameter in the current working condition.

[0026] According to the working machine provided by the present application, the detection device comprises a temperature sensor used for detecting the current environmental temperature or used for detecting the current temperature of the hydraulic oil in the hydraulic pump.

[0027] The application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method for starting the engine according to any one of the above embodiments when executing the program.

[0028] The application also provides a non-transitory computer-readable storage medium, which stores a computer program, wherein the computer program is executable on a processor to implement the steps of the control method for starting the engine according to any one of the above embodiments.

[0029] The control method for starting the engine provided by the application determines whether the starter can start the engine by comparing the maximum load of the starter and the current load required for starting the engine, wherein the current load comprises a first load of the engine body and a second load of the hydraulic pump; when the maximum load is less than the current load, the starter cannot start the engine, and the second load of the hydraulic pump is reduced to a target load, so that the current load is reduced to be lower than the maximum load, and the starter can start the engine; then the controller sends an execution signal to control the starter to perform the starting action, which is suitable for starting the compressor under various working conditions.

[0030] Further, the hydraulic pump is a variable displacement pump, and the second load is reduced to the target load by adjusting the displacement of the hydraulic pump, for example, the displacement of the hydraulic pump is reduced to a minimum displacement, and the minimum displacement can be zero displacement.

[0031] Further, after the engine is started, the displacement of the hydraulic pump is increased again to meet the operation demand. In the step of determining whether the engine is started, the current speed of the engine can be compared with a starting speed, and if the current speed is greater than or equal to the starting speed, it is determined that the engine is successfully started, otherwise, it is not successfully started.

[0032] In addition, the load adjustment mode of the hydraulic pump is not limited to displacement adjustment, and a bypass oil path can also be arranged in the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder of the bypass oil path is drained to reduce the load of the hydraulic oil on the engine, so that the second load is reduced to the target load. The load adjustment mode is various and has a wider application range. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0034] Figure 1 is one of the flowcharts of the control method for starting the engine provided by the application.

[0035] Figure 2 is the second flowchart of the control method of engine starting provided by the present application;

[0036] Figure 3 is the structural diagram of the electronic device provided by the present application; DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described below in connection with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] Reference Figure 1 As shown in the figure, the present application provides a control method of engine starting, comprising:

[0039] Step 110, receiving a starting signal;

[0040] The user inputs a starting signal to the device, and the controller receives the starting signal. The user inputs the starting signal in various ways, such as the user inputs the starting signal through a key, the user inputs the starting signal by operating a starting button, or the user inputs the starting signal through a mobile client. The input form of the starting signal is various, which can be selected as needed. No matter how the starting signal is input, the controller can receive the starting signal.

[0041] Step 120, obtaining the maximum load of the first load, the second load and the starter, wherein the starter is used to start the engine, the first load is the load of the body of the engine, and the second load is the hydraulic load of the hydraulic pump to the engine under the current working condition;

[0042] The first load can be understood as being related to the performance of the body of the engine. When the model and performance of the engine are determined, the first load can be determined. The first load can be a constant, or the first load can vary according to a preset curve. The influence of the first load on the environmental conditions can be ignored. Of course, the first load can also vary according to the current working condition. The first load can be obtained or detected through the specification.

[0043] The second load can be understood as the hydraulic load of the hydraulic pump to the engine. The hydraulic load at least includes the resistance provided by the hydraulic oil in the hydraulic cylinder of the hydraulic pump to the engine. The main influencing factors of the hydraulic load include the displacement of the hydraulic pump and the viscosity of the hydraulic oil. The sum of the first load and the second load is the load that the starter needs to overcome to start the engine.

[0044] The hydraulic load of the hydraulic pump on the engine under the current working condition, wherein the "current working condition" can be understood as the working condition of the hydraulic pump, such as the current temperature condition, the current humidity condition, the current road condition, the current operation condition, etc. of the hydraulic pump. Under different working conditions, the hydraulic load of the hydraulic pump on the engine is different. Under different "current working conditions", the hydraulic load of the hydraulic pump on the engine can be obtained by measurement.

[0045] In some embodiments, the current working condition includes at least one of the current ambient temperature, the current temperature of the hydraulic oil in the hydraulic pump, and the set working mode. The working condition of the device is determined according to the current ambient temperature, such as low-temperature working condition (below 0℃) and normal-temperature working condition (about 20℃). Under different working conditions, the hydraulic load of the hydraulic pump on the engine is different. The second load of the hydraulic oil on the engine can also be determined according to the current temperature of the hydraulic oil. Under different temperature conditions, the flowability of the hydraulic oil is different, and the resistance (load) of the hydraulic oil on the engine is different. The current set working mode can also be used. Under different working modes, the hydraulic power required by the hydraulic pump is different, and the second load changes when the current set working mode changes.

[0046] For example, under the low-temperature working condition, the flowability of the hydraulic oil is poor compared with the normal-temperature working condition, the starting resistance of the hydraulic oil on the engine increases, that is, the hydraulic load increases, and the starting power required by the starter under the low-temperature working condition needs to be greater than the starting power under the normal-temperature working condition. If the starting power under the normal-temperature working condition is equal to the maximum load of the starter, the starter is difficult to start the engine under the low-temperature working condition, which affects the use of the device and even the operation progress and operation efficiency.

[0047] The maximum load of the starter can be understood as the maximum starting capacity of the starter. When the maximum load of the starter is greater than the power required for starting the engine, the starter can start the engine. When the model and performance of the starter are determined, the maximum starting load value of the starter can be obtained, and the maximum load can be the maximum starting load value. The maximum starting load value can be obtained according to the starter characteristic curve. The maximum load that the starter can drive during the starting process is determined by the maximum starting torque of the starter.

[0048] Step 130, determining that the sum of the first load and the second load is greater than the maximum load, controlling the second load to decrease to the target load, so that the sum of the first load and the target load is less than or equal to the maximum load;

[0049] The target load can be determined according to a calculated difference between the maximum load and the first load, and the target load needs to be less than or equal to the calculated difference, that is, the hydraulic load of the hydraulic pump is reduced to reduce the load required in the process of starting the engine by the starter, so as to ensure that the starting power of the starter is greater than or equal to the load (the sum of the first load and the second load) required for starting the engine, which helps to stabilize the starting of the engine.

[0050] The second load of the hydraulic pump can be reduced to the target load in the following ways: reducing the displacement of the hydraulic pump, reducing the hydraulic load generated by the hydraulic pump, improving the flowability of the hydraulic oil of the hydraulic pump, such as adding a viscosity-reducing component to the hydraulic oil, heating the hydraulic oil, and the like, and at least partially guiding the hydraulic oil from the hydraulic cylinder to the bypass oil path to reduce the hydraulic load of the hydraulic oil in the hydraulic cylinder, and the like. The second load can be reduced to the target load in the above ways, but is not limited thereto, and can be selected as required.

[0051] It should be noted that the first load can be understood as a determined parameter, and the first load is not controlled.

[0052] In step 140, a execution signal is sent, and the execution signal is used to control the starter to start the engine.

[0053] On the premise that the user inputs the starting signal and adjusts the actual load of the engine to be less than or equal to the maximum load of the starter, the controller sends an execution signal, and based on the execution signal, the starter performs the action of starting the engine, so as to ensure that the engine can be started smoothly.

[0054] The control method for starting the engine according to the embodiment of the application can confirm the reasonable load that can be borne by the starter in the starting process after receiving the starting signal of the user, first adjust the hydraulic load (the second load) of the hydraulic pump on the engine, adjust the second load to be less than or equal to the target load, so that the maximum load of the starter is greater than or equal to the actual load (the sum of the first load and the target load) of the engine, reduce the hydraulic load in the starting process, and ensure that the starter can start the engine stably.

[0055] By adjusting the hydraulic load of the hydraulic pump on the engine, the starting power required by the starter is reduced, the adjustment range of the hydraulic load is wide, the adjustment means of the hydraulic load is various, the adjustment method of the hydraulic load is simple, the influence on the structure and performance of the equipment is small, the influence on the cost of the equipment is small, and the working efficiency of the equipment can be ensured.

[0056] In some embodiments, in step 130, the step of reducing the second load to the target load comprises:

[0057] The displacement of the hydraulic pump is reduced to control the second load to be reduced to the target load.

[0058] The hydraulic pump is a variable displacement pump, and the second load of the hydraulic pump is reduced to the target load by adjusting the displacement of the hydraulic pump. The adjustment is simple and does not require changing the structure of the hydraulic pump, and has no impact on the cost of the equipment.

[0059] By adjusting the displacement of the hydraulic pump, the adjustment range of the load of the hydraulic pump is large, and the hydraulic load during the starting process can be reasonably controlled.

[0060] In some cases, the hydraulic load is adjusted by changing the flowability of the hydraulic oil, and the adjustable range of the hydraulic load is narrow, and the applicable working conditions are limited. For example, the hydraulic load is reduced by heating, and the adjustable range of the hydraulic load is narrow, and the battery power consumption at low temperature is large, which reduces the service life of the battery.

[0061] In some embodiments, the target load is the minimum load of the hydraulic pump, for example, the displacement of the hydraulic pump is adjusted to the minimum displacement.

[0062] When the minimum load of the hydraulic pump is 0, the target load can be adjusted to 0, and the load of the hydraulic oil in the hydraulic pump to the engine is reduced to 0, and the influence of the hydraulic pump on the starting of the engine is removed. When the minimum displacement of the hydraulic pump is 0, it can be understood that the minimum load of the hydraulic pump is 0, the adjustment range of the displacement of the hydraulic pump is wide, and the adjustment range of the hydraulic load is wide.

[0063] Taking an excavator provided with a hydraulic pump, an engine and a starter as an example, the variable displacement hydraulic pump is provided with a solenoid valve, and the displacement of the outlet of the hydraulic pump is adjusted by the solenoid valve, so that the second load of the hydraulic pump is reduced to the target load.

[0064] In some embodiments, after step 140, that is, after the step of sending the execution signal, the method further comprises:

[0065] Step 141, determining whether the engine starts successfully;

[0066] Determining whether the engine starts successfully can be receiving a starting success instruction sent by the engine to the controller, and can also be one or more variable parameters sent by the engine to the controller. When the variable parameter reaches the set threshold, the controller can determine that the engine starts successfully, and when the variable parameter does not reach the set threshold, the controller can determine that the engine does not start successfully.

[0067] Step 142, adjusting the solenoid valve of the hydraulic pump to adjust the displacement of the hydraulic pump to the displacement required by the current working mode.

[0068] When the hydraulic pump is a variable displacement pump, after the engine starts successfully, the displacement of the hydraulic pump is adjusted to the target displacement, and the target displacement is the displacement required by the current working mode. The "displacement required by the current working mode" can be the displacement required by the equipment operation, or the optimal displacement required by the equipment operation, so as to ensure the working performance of the equipment.

[0069] In some embodiments, the step 141, i.e., the step of determining that the engine is successfully started, comprises:

[0070] In step 143, the starting speed and the current speed of the output shaft of the engine are obtained.

[0071] The starting speed can be understood as the speed required for the engine to start, and the starting speed is determined according to the model and performance of the engine. The current speed can be understood as the real-time speed detected by the sensor.

[0072] Both the starting speed and the current speed can be understood as the speed of the crankshaft of the engine.

[0073] In step 144, it is determined that the engine is successfully started based on the current speed being greater than or equal to the starting speed.

[0074] When the current speed is greater than or equal to the starting speed, it is determined that the engine is started. The judgment condition for determining whether the engine is started is simple, and the speed detection is simple.

[0075] The determination that the engine is successfully started can be understood as that the engine sends a start success signal to the controller, or that the parameters sent by the engine to the controller meet the start success threshold.

[0076] It should be noted that the judgment condition for determining that the engine is successfully started can be but is not limited to the speed, and can also be the torque, cylinder pressure, etc.

[0077] In some embodiments, in step 130, the step of controlling the second load to be reduced to the target load comprises:

[0078] Based on the fact that the hydraulic pump is provided with a bypass oil path in communication with the hydraulic cylinder, the hydraulic oil in the hydraulic cylinder is diverted to the bypass oil path, so that the load of the hydraulic pump is reduced to the target load.

[0079] The hydraulic oil in the hydraulic cylinder is diverted through the bypass oil path, which can reduce the load of the hydraulic oil in the hydraulic cylinder on the engine. At this time, the type of the hydraulic pump is not limited to the variable displacement pump, and the hydraulic load of the hydraulic pump on the engine can be realized by optimizing the structure of the fixed displacement pump.

[0080] In some embodiments, under the premise that the hydraulic pump is a zero-displacement pump, the most suitable hydraulic load under different environmental temperatures is calculated according to the characteristic curve of the starter and the first load of the engine body, the displacement of the hydraulic pump is controlled to be reduced by the controller to adjust the hydraulic load to the required load value, and the starting requirement of the engine is met.

[0081] Based on the above engine starting control method, it can be known that by regulating the hydraulic load of the hydraulic pump on the engine, stable starting of the engine is realized, so that the equipment is more widely applicable, and the problem of difficult engine starting in low temperature working conditions is solved. As for the load adjustment of the hydraulic pump, a variable pump can be selected to regulate the displacement of the hydraulic pump, or a fixed displacement pump can be selected, and by optimizing the structure of the fixed displacement pump, the load of the hydraulic pump can also be regulated, which is widely applicable and simple to adjust.

[0082] The second aspect of the present application provides a working machine, comprising:

[0083] an engine;

[0084] a starter connected to the engine and configured to start the engine;

[0085] a hydraulic pump connected to the engine;

[0086] a controller configured to execute the engine starting control method according to any one of the above;

[0087] a detection device configured to obtain a working parameter under a current working condition.

[0088] The detection device detects the working parameter under the current working condition, and determines the hydraulic load of the hydraulic pump on the engine according to the current working condition.

[0089] The hydraulic pump can be connected to the engine through a shaft coupling.

[0090] The controller is configured to execute the above engine starting control method, so that the working machine has the above beneficial effects, and specific reference can be made to the above content, which will not be repeated here.

[0091] In some embodiments, the detection device includes a temperature sensor configured to detect a current ambient temperature or to detect a current temperature of hydraulic oil in the hydraulic pump.

[0092] When the temperature sensor is used to detect the ambient temperature, the temperature environment of the working machine can be determined, such as the above-mentioned low temperature working condition (0℃ or below) and normal temperature working condition (about 20℃). For different temperature environments, the hydraulic load of the hydraulic pump on the engine is obtained. The hydraulic load corresponding to different ambient temperatures can be obtained through experiments.

[0093] When the temperature sensor is used to detect the current temperature of the hydraulic oil, the hydraulic load of the hydraulic oil on the engine can be obtained. The hydraulic load corresponding to different temperatures of the hydraulic oil can be obtained through experiments.

[0094] Taking a working machine as an excavator, the controller of the excavator collects the temperature of the engine through a temperature sensor, and obtains the engine self-load P1 and the current hydraulic load P2 of the hydraulic pump on the engine at the temperature T according to the collected temperature value T.

[0095] Referring to Figure 2 As shown, during the starting process, when the controller receives the starting signal given by the key switch, the controller confirms whether the current load exceeds the maximum load of the starter according to the comparison of the size of the p value and P1+P2 (current load). If the current load is less than the maximum load of the starter, it is directly started; if the current load is greater than the maximum load of the starter, the controller outputs a control signal, which is used to control the outlet electromagnetic valve of the hydraulic pump. The displacement of the hydraulic pump can be reduced by controlling the electromagnetic valve, so as to reduce the hydraulic load. When P2+P1≤p, the controller outputs an execution signal, and starts the engine according to the execution signal.

[0096] The controller pre-sets the starting speed n required for the engine to start successfully, and after the controller outputs the starting signal, the current speed n1 of the engine is collected through the speed sensor of the engine. The engine is judged to be started successfully by judging n1≥n, at this time, the controller sends an adjustment signal to the electromagnetic valve, and adjusts the displacement of the hydraulic pump based on the adjustment signal, and adjusts the displacement of the hydraulic pump back to the optimal displacement. The hydraulic pump can be a zero-displacement pump, and the optimal starting displacement of the hydraulic pump during the starting process is controlled by the controller.

[0097] During the starting process, based on the temperature information (such as the ambient temperature), the starter characteristic curve and the zero-displacement pump, the engine self-load and the hydraulic load of the hydraulic pump at different ambient temperatures, the hydraulic load of the hydraulic pump during the starting process is accurately controlled by the controller, and the optimal displacement value of the hydraulic pump is derived, such as the zero-displacement pump is adjusted to the minimum displacement (zero displacement), the starter load is reduced, and the starting performance is improved.

[0098] The third aspect of the embodiment of the application provides an electronic device, such as Figure 3 An example of an electronic device is shown in the schematic diagram of the physical structure, which includes a memory, a processor and a computer program stored on the memory and executable on the processor. The processor executes the program to implement the steps of the engine starting control method according to any one of the above.

[0099] As Figure 3As shown, the electronic device can include a processor 810, a communications interface 820, a memory 830, and a communications bus 840, wherein the processor 810, the communications interface 820, and the memory 830 complete communications with each other through the communications bus 840. The processor 810 can invoke a logical instruction in the memory 830 to execute the steps of the control method of engine starting.

[0100] In addition, the logical instruction in the memory 830 described above can be implemented in the form of a software functional unit and sold or used as an independent product, and can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0101] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, when the program instructions are executed by a computer, the computer can execute the steps of the control method of engine starting provided above.

[0102] In yet another aspect, the present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the steps of the control method of engine starting provided above.

[0103] The device embodiments described above are only schematic, wherein the units shown as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement without creative labor.

[0104] Those skilled in the art can clearly understand the technical solutions of the various embodiments from the above description of the embodiments, and the various embodiments can be implemented by means of software with the necessary general hardware platforms, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0105] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method of engine start, characterized by, The method comprises: receiving a starting signal; acquiring a first load, a second load and a maximum load of a starter, wherein the starter is used to start an engine, the first load is a load of a body of the engine, and the second load is a hydraulic load of a hydraulic pump on the engine under a current working condition; determining that a sum of the first load and the second load is greater than the maximum load, and controlling the second load to decrease to a target load, so that a sum of the first load and the target load is less than or equal to the maximum load; sending an execution signal, wherein the execution signal is used to control the starter to start the engine; the step of controlling the second load to decrease to the target load comprises: controlling the second load to decrease to the target load by decreasing a displacement of the hydraulic pump; after the step of sending the execution signal, the method further comprises: determining that the engine is successfully started; controlling an electromagnetic valve of the hydraulic pump to adjust the displacement of the hydraulic pump to a displacement required by a current working mode.

2. The control method of engine start according to claim 1, characterized by, the step of determining that the engine is successfully started comprises: acquiring a starting rotating speed and a current rotating speed of an output shaft of the engine; determining that the engine is successfully started based on the current rotating speed being greater than or equal to the starting rotating speed.

3. The control method of engine start according to claim 1, characterized by, the step of controlling the second load to decrease to the target load comprises: controlling the second load to decrease to the target load by controlling hydraulic oil in a hydraulic cylinder to be shunted to a bypass oil path of the hydraulic pump, so that the load of the hydraulic pump is decreased to the target load.

4. The control method of engine start according to any one of claims 1 to 3, characterized by, the target load is a minimum load of the hydraulic pump.

5. The control method of engine start according to any one of claims 1 to 3, characterized by, the current working condition comprises at least one of a current ambient temperature, a current temperature of hydraulic oil in the hydraulic pump and a set working mode.

6. A work machine characterized by comprising: The method comprises: an engine; a starter connected to the engine and used to start the engine; a hydraulic pump connected to the engine; a controller used to execute the control method for starting the engine according to any one of claims 1 to 5; and a detection device used to acquire a working parameter under the current working condition.

7. A work machine according to claim 6, characterised in that The detection device comprises a temperature sensor used to detect a current ambient temperature or used to detect a current temperature of hydraulic oil in the hydraulic pump.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the steps of the control method for starting the engine according to any one of claims 1 to 5.

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