Driving system, engineering machinery and engineering machinery control method

Abstract

The invention discloses a driving system, engineering machinery and an engineering machinery control method. The driving system comprises a methanol storage box, a power battery, a methanol power range extender, a methanol reforming hydrogen production device and a fuel cell. The methanol storage box is used for storing methanol; the power battery is electrically connected with electric equipment; the methanol power range extender comprises a methanol generator and a methanol engine, the displacement of the methanol engine is less than 8 liters, the methanol storage tank and the methanol generator are both connected with the methanol engine, and the methanol generator is electrically connected with the power battery; the methanol reforming hydrogen production device is connected with the methanol storage tank; the fuel cell is connected with the methanol reforming hydrogen production device, the fuel cell generates electricity through hydrogen, and the fuel cell is electrically connected with the power cell so as to charge the power cell. According to the driving system, the combustion performance of the methanol engine of the methanol power range extender can be improved under the condition that the range extending power generation requirement of the heavy engineering machinery is met, and therefore complete combustion of the methanol engine can be achieved.

Description

Technical Field

[0001] The present application relates to the field of range extender equipment for construction machinery, and particularly to a drive system, a construction machinery, and a control method for construction machinery. Background Art

[0002] In the prior art, heavy construction machinery (such as heavy trucks, ships, agricultural machinery, etc.) is extended in range through a methanol-powered range extender. The methanol-powered range extender generates electricity through methanol fuel, thereby charging a power battery or directly supplying power to a drive motor, and further extending the driving range of the construction machinery.

[0003] However, the engine of the methanol-powered range extender of heavy construction machinery burns incompletely, resulting in the easy generation of formic acid in the engine, which in turn causes the engine of the methanol-powered range extender to be easily corroded, and further leads to a decrease in the service life of the engine of the methanol-powered range extender. Summary of the Invention

[0004] The present application is made based on the inventor's discovery and recognition of the following facts and problems: The inventor of the present application found that when the displacement of the engine of the methanol-powered range extender is less than 8 liters, the combustion performance of the engine is good and the engine burns completely. However, an engine with a displacement of less than 8 liters is difficult to meet the requirements of heavy construction machinery. That is to say, in the existing heavy construction machinery, the displacement of the engine of the methanol-powered range extender is greater than 8 liters, resulting in incomplete combustion of the engine, which in turn causes the easy generation of formic acid in the engine.

[0005] The purpose of the present application is to at least solve the problem of incomplete combustion of the engine of the methanol-powered range extender in heavy construction machinery in the prior art. This purpose is achieved in the following manner: A first aspect of the present application provides a drive system, including: a methanol storage tank, a power battery, a methanol-powered range extender, a methanol reforming hydrogen generator, and a fuel cell. The methanol storage tank is used for storing methanol; the power battery is electrically connected to an electrical device to supply power to the electrical device; the methanol-powered range extender includes a methanol generator and a methanol engine, the displacement of the methanol engine is less than 8 liters, the methanol engine is connected to the methanol storage tank to be able to receive methanol, the methanol engine is connected to the methanol generator to drive the methanol generator to generate electricity by burning methanol, the methanol generator is electrically connected to the power battery to be able to charge the power battery; the methanol reforming hydrogen generator is connected to the methanol storage tank to be able to receive methanol, the methanol reforming hydrogen generator is used for producing hydrogen through methanol; the fuel cell is connected to the methanol reforming hydrogen generator to be able to receive hydrogen, the fuel cell is used for generating electricity through hydrogen, and the fuel cell is electrically connected to the power battery to be able to charge the power battery.

[0006] The drive system of the present application can enable the methanol engine to have high combustion performance by making the displacement of the methanol engine less than 8 liters, so that the methanol engine can burn sufficiently, thereby avoiding the probability of formic acid generation in the methanol engine, making the methanol engine not easily corroded, and increasing the service life of the methanol power extender. The methanol reformer and fuel cell can generate electricity through methanol, which can increase the charging amount of the power battery. That is to say, through the combined power generation of the fuel cell and the methanol power extender, the requirements of heavy construction machinery can be met. Therefore, the drive system of the embodiments of the present application can improve the combustion performance of the methanol engine of the methanol power extender while meeting the range-extended power generation requirements of heavy construction machinery, so that the methanol engine can burn completely.

[0007] In some embodiments, the fuel cell includes a high-temperature fuel cell and a low-temperature fuel cell. The high-temperature fuel cell and the low-temperature fuel cell are arranged in parallel. Both the high-temperature fuel cell and the low-temperature fuel cell are connected to the methanol reformer to receive hydrogen. Both the high-temperature fuel cell and the low-temperature fuel cell are electrically connected to the power battery to charge the power battery. The low-temperature fuel cell is used to work when the high-temperature fuel cell is preheating and is turned off when the high-temperature fuel cell is working.

[0008] In some embodiments, the drive system further includes a pressure swing adsorption device. The inlet of the pressure swing adsorption device is connected to the methanol reformer to receive hydrogen and purify the hydrogen. The outlet of the pressure swing adsorption device is connected to the low-temperature fuel cell to supply purified hydrogen to the low-temperature fuel cell.

[0009] In some embodiments, the drive system further includes a water tank for storing water. The water tank is connected to the methanol reformer to supply water to the methanol reformer.

[0010] A second aspect of the present application provides a construction machinery, including: a main body, an electrical device, and the drive system described in the first aspect above. The electrical device is arranged on the main body; the drive system is arranged on the main body, and the power battery is electrically connected to the electrical device to supply power to the electrical device.

[0011] The construction machinery of the present application includes the drive system as described in the first aspect above. By making the displacement of the methanol engine less than 8 liters, the methanol engine can have high combustion performance, enabling the methanol engine to burn sufficiently, thereby avoiding the probability of formic acid generation in the methanol engine, making the methanol engine less prone to corrosion, and increasing the lifespan of the methanol power extender. Through the methanol reforming hydrogen generator and the fuel cell, electricity can be generated from methanol, increasing the charging amount of the power battery. That is to say, through the combined power generation of the fuel cell and the methanol power extender, the requirements of the construction machinery in the embodiments of the present application can be met. Thus, the construction machinery in the embodiments of the present application can improve the combustion performance of the methanol engine of the methanol power extender when the range extension power generation demand can be satisfied, enabling the methanol engine to burn completely.

[0012] The third aspect of the present application proposes a construction machinery control method applied to construction machinery, which includes: a main body, electrical equipment, and a drive system. The electrical equipment is provided on the main body; the drive system includes: a methanol storage tank, a power battery, a methanol power extender, a methanol reforming hydrogen generator, a high-temperature fuel cell, and a low-temperature fuel cell. The methanol storage tank is used to store methanol; the power battery is electrically connected to the electrical equipment to supply power to the electrical equipment; the methanol power extender includes a methanol generator and a methanol engine with a displacement less than 8 liters. The methanol engine is connected to the methanol storage tank to receive methanol, and the methanol engine is connected to the methanol generator to drive the methanol generator to generate electricity by burning methanol. The methanol generator is electrically connected to the power battery to charge the power battery; the methanol reforming hydrogen generator is connected to the methanol storage tank to receive methanol and is used to produce hydrogen from methanol; the high-temperature fuel cell and the low-temperature fuel cell are arranged in parallel, and both the high-temperature fuel cell and the low-temperature fuel cell are connected to the methanol reforming hydrogen generator to receive hydrogen, and both the high-temperature fuel cell and the low-temperature fuel cell are electrically connected to the power battery to charge the power battery. The construction machinery control method includes: Obtain the remaining power of the power battery and compare the remaining power of the power battery with a first threshold, where the first threshold is used to characterize the power state of the power battery; According to the remaining power of the power battery being less than the first threshold, start the methanol power extender, control the preheating of the high-temperature fuel cell, and control the operation of the low-temperature fuel cell; Obtain the preheating state of the high-temperature fuel cell and determine whether the high-temperature fuel cell has completed preheating; Complete preheating according to the high-temperature fuel cell, control the operation of the high-temperature fuel cell, and turn off the low-temperature fuel cell.

[0013] The construction machinery control method of the present application can accurately judge the power state of the power battery by obtaining the remaining power of the power battery and comparing the remaining power of the power battery with a first threshold. When the remaining power is lower than the first threshold, it indicates that the power of the power battery is insufficient and range-extended power generation is required, so that corresponding charging measures can be started in time to avoid over-discharging of the power battery, extend the service life of the power battery, and ensure that the vehicle has sufficient power supply to maintain normal operation. By starting the methanol-powered range extender according to the remaining power of the power battery being less than the first threshold, controlling the preheating of the high-temperature fuel cell, and controlling the operation of the low-temperature fuel cell, when the power of the power battery is insufficient, the methanol-powered range extender is started to charge the power battery, the preheating of the high-temperature fuel cell is controlled, and the operation of the low-temperature fuel cell is controlled, so that the characteristics of fast start of the low-temperature fuel cell can be utilized to timely supplement the power of the power battery during the preheating of the high-temperature fuel cell to meet the range-extended power generation requirements of the construction machinery. By obtaining the preheating state of the high-temperature fuel cell and judging whether the high-temperature fuel cell has completed preheating; and controlling the operation of the high-temperature fuel cell and turning off the low-temperature fuel cell according to the completion of the preheating of the high-temperature fuel cell, by obtaining the preheating state of the high-temperature fuel cell, after the high-temperature fuel cell completes preheating, control the operation of the high-temperature fuel cell and turn off the low-temperature fuel cell. Since the high-temperature fuel cell has a high power generation efficiency, it can be put into operation after the preheating of the high-temperature fuel cell is completed, which can improve the overall power generation efficiency, effectively utilize energy, and reduce fuel consumption and operating costs.

[0014] In some embodiments, the construction machinery control method includes: Obtain the remaining power of the power battery and compare the remaining power of the power battery with a second threshold, where the second threshold is used to characterize the power state of the power battery, and the second threshold is less than the first threshold; Turn on the low-temperature fuel cell according to the remaining power of the power battery being less than the second threshold.

[0015] In some embodiments, the electrical equipment includes a drive motor for driving the movement of the main body, and the construction machinery control method further includes: Obtain the output power of the drive motor, calculate the power ratio of the output power of the drive motor relative to the rated power of the drive motor, and compare the power ratio with a third threshold, where the third threshold is used to characterize the ratio state of the output power of the drive motor relative to the rated power of the drive motor; Obtain the remaining power of the power battery according to the power ratio being greater than the third threshold, and compare the remaining power of the power battery with a fourth threshold, where the fourth threshold is used to characterize the power state of the power battery, and the fourth threshold is greater than the first threshold; Start the methanol-powered range extender and control the operation of the low-temperature fuel cell according to the remaining power of the power battery being less than the fourth threshold; Obtain the preheating state of the high-temperature fuel cell and determine whether the high-temperature fuel cell has completed preheating; Control the operation of the high-temperature fuel cell according to the high-temperature fuel cell having completed preheating.

[0016] In some embodiments, the construction machinery control method further includes: Obtain the remaining power of the power battery, and compare the remaining power of the power battery with an overcharge threshold, where the overcharge threshold is used to characterize the power state of the power battery, and the overcharge threshold is greater than the first threshold; Control to turn off the methanol-powered range extender, the high-temperature fuel cell and the low-temperature fuel cell according to the remaining power of the power battery being greater than or equal to the overcharge threshold.

[0017] In some embodiments, the construction machinery control method further includes: In response to the construction machinery being charged, control to turn off the methanol-powered range extender, the high-temperature fuel cell and the low-temperature fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them: Figure 1 is a schematic diagram of the drive system according to an embodiment of the present application; Figure 2 is a schematic diagram of the construction machinery control method according to an embodiment of the present application; Figure 3 is a schematic diagram of the construction machinery control method according to a further embodiment of the present application; Figure 4 is a schematic diagram of the construction machinery control method according to a further embodiment of the present application; Figure 5 is a schematic diagram of the construction machinery control method according to a further embodiment of the present application; Figure 6 is a schematic diagram of the construction machinery control method according to a further embodiment of the present application.

[0019] The reference numerals in the drawings are defined as follows: 100, drive system; 1, methanol storage tank; 2, power battery; 3, methanol range extender; 31, methanol generator; 32, methanol engine; 4, methanol reforming hydrogen generator; 5, fuel cell; 51, high-temperature fuel cell; 52, low-temperature fuel cell; 6, pressure swing adsorption device; 7, water tank. Detailed implementation manners

[0020] Exemplary embodiments of the present application will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0021] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that alternative or additional steps may be used.

[0022] Although terms such as first, second, and third may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0023] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation other than the orientations depicted in the figures. For example, if the device in the figures is rotated, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0024] In the description of the application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0025] In this application, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the prior art, heavy construction machinery (such as heavy trucks, ships, agricultural machinery, etc.) is extended by a methanol-powered range extender. The methanol-powered range extender generates electricity through methanol fuel, thereby charging a power battery or directly supplying power to a drive motor, and further extending the driving range of the construction machinery.

[0027] However, the engine of the methanol-powered range extender of heavy construction machinery burns incompletely, resulting in the easy generation of formic acid in the engine, thereby causing the engine of the methanol-powered range extender to be easily corroded, and further leading to a decrease in the service life of the engine of the methanol-powered range extender.

[0028] This application is based on the inventor's discovery and recognition of the following facts and problems: The inventor of this application found that when the displacement of the engine of the methanol-powered range extender is less than 8 liters, the combustion performance of the engine is good and the engine burns completely. However, an engine with a displacement of less than 8 liters is difficult to meet the requirements of heavy construction machinery. That is to say, in the existing heavy construction machinery, the displacement of the engine of the methanol-powered range extender is greater than 8 liters, resulting in incomplete combustion of the engine, and thus formic acid is easily generated in the engine.

[0029] To at least solve the problem of incomplete combustion of the engine of the methanol-powered range extender of heavy construction machinery in the prior art. An embodiment of this application proposes a drive system 100, which can improve the combustion performance of the methanol engine 32 of the methanol-powered range extender 3 while meeting the range-extending power generation requirements of heavy construction machinery, so that the methanol engine 32 can burn completely.

[0030] An embodiment of this application also proposes a construction machinery applied to the drive system 100 in the above embodiment.

[0031] Based on the same inventive concept, an embodiment of this application also proposes a construction machinery control method.

[0032] The drive system 100, construction machinery, and construction machinery control method of the embodiments of this application will be described below with reference to the accompanying drawings.

[0033] As Figure 1As shown in the figure, the drive system 100 of the embodiment of the present application includes: a methanol storage tank 1, a power battery 2, a methanol range extender 3, a methanol reforming hydrogen generator 4, and a fuel cell 5. The methanol storage tank 1 is used to store methanol; the power battery 2 is electrically connected to an electrical device to supply power to the electrical device; the methanol range extender 3 includes a methanol generator 31 and a methanol engine 32. The displacement of the methanol engine 32 is less than 8 liters. The methanol engine 32 is connected to the methanol storage tank 1 to be able to receive methanol. The methanol engine 32 is connected to the methanol generator 31 to drive the methanol generator 31 to generate electricity by burning methanol. The methanol generator 31 is electrically connected to the power battery 2 to be able to charge the power battery 2; the methanol reforming hydrogen generator 4 is connected to the methanol storage tank 1 to be able to receive methanol. The methanol reforming hydrogen generator 4 is used to produce hydrogen through methanol; the fuel cell 5 is connected to the methanol reforming hydrogen generator 4 to be able to receive hydrogen. The fuel cell 5 is used to generate electricity through hydrogen. The fuel cell 5 is electrically connected to the power battery 2 to be able to charge the power battery 2.

[0034] When it is necessary to charge the power battery 2, start the methanol range extender 3. The methanol storage tank 1 delivers methanol to the methanol engine 32. The methanol engine 32 burns methanol and drives the methanol generator 31 to generate electricity. The methanol generator 31 charges the power battery 2. Start the methanol reforming hydrogen generator 4. The methanol storage tank 1 delivers methanol to the methanol reforming hydrogen generator 4. The methanol reforming hydrogen generator 4 produces hydrogen through methanol and delivers the hydrogen to the fuel cell 5. The fuel cell 5 generates electricity through hydrogen and charges the power battery 2.

[0035] By making the displacement of the methanol engine 32 less than 8 liters, the methanol engine 32 can have high combustion performance, so that the methanol engine 32 can burn sufficiently, thereby avoiding the probability of formic acid generation in the methanol engine 32, so that the methanol engine 32 is not easily corroded, and thus increasing the service life of the methanol range extender 3.

[0036] Through the methanol reforming hydrogen generator 4 and the fuel cell 5, electricity can be generated through methanol, which can increase the charging amount of the power battery 2. That is to say, by the combined power generation method of the fuel cell 5 and the methanol range extender 3, the requirements of heavy construction machinery can be met.

[0037] Therefore, the drive system 100 of the embodiment of the present application can improve the combustion performance of the methanol engine 32 of the methanol range extender 3 while meeting the range extension power generation requirements of heavy construction machinery, so that the methanol engine 32 can burn completely.

[0038] Such as Figure 1As shown, in some embodiments, the fuel cell 5 includes a high-temperature fuel cell 51 and a low-temperature fuel cell 52. The high-temperature fuel cell 51 and the low-temperature fuel cell 52 are arranged in parallel. Both the high-temperature fuel cell 51 and the low-temperature fuel cell 52 are connected to the methanol reforming hydrogen generator 4 to receive hydrogen. Both the high-temperature fuel cell 51 and the low-temperature fuel cell 52 are electrically connected to the power battery 2 to charge the power battery 2. The low-temperature fuel cell 52 is used to operate when the high-temperature fuel cell 51 is preheating and is used to shut down when the high-temperature fuel cell 51 is operating.

[0039] The low-temperature fuel cell 52 has a fast startup speed. During the preheating stage of the high-temperature fuel cell 51, the low-temperature fuel cell 52 can quickly start working, thereby charging the power battery 2 in a timely manner, and further enabling the power generation of the fuel cell 5 and the methanol-powered range extender 3 to meet the requirements of heavy construction machinery.

[0040] The high-temperature fuel cell 51 has a high power generation efficiency. After the high-temperature fuel cell 51 is preheated and operates normally, it can convert more hydrogen chemical energy into electrical energy. When the high-temperature fuel cell 51 is operating, shutting down the low-temperature fuel cell 52 can more effectively utilize the fuel, thereby reducing fuel consumption and operating costs.

[0041] The drive system 100 of the embodiment of the present application realizes the optimal allocation of resources by reasonably utilizing the characteristics of the fast startup of the low-temperature fuel cell 52 and the high efficiency of the high-temperature fuel cell 51, making the entire fuel cell 5 have better performance.

[0042] As Figure 1 shown, in some embodiments, the drive system 100 further includes a pressure swing adsorption device 6. The inlet of the pressure swing adsorption device 6 is connected to the methanol reforming hydrogen generator 4 to receive hydrogen and purify the hydrogen. The outlet of the pressure swing adsorption device 6 is connected to the low-temperature fuel cell 52 to deliver the purified hydrogen to the low-temperature fuel cell 52.

[0043] The pressure swing adsorption device 6 can purify hydrogen, thereby removing impurities such as carbon monoxide, carbon dioxide, and water vapor in the hydrogen, reducing the probability of catalyst poisoning of the low-temperature fuel cell 52, reducing the damage of impurities to the low-temperature fuel cell 52, and extending the service life of the low-temperature fuel cell 52. Moreover, after the pressure swing adsorption device 6 purifies the hydrogen, the purity of the hydrogen entering the low-temperature fuel cell 52 is increased, which helps the low-temperature fuel cell 52 to operate more stably and efficiently.

[0044] As Figure 1 shown, in some embodiments, the drive system 100 further includes a water tank 7. The water tank 7 is used for storing water. The water tank 7 is connected to the methanol reforming hydrogen generator 4 to supply water to the methanol reforming hydrogen generator 4.

[0045] The water tank 7 provides a stable water source for the methanol reforming hydrogen generator, enabling the reforming reaction of methanol and water under certain conditions to produce products such as hydrogen and carbon dioxide. An adequate water supply helps ensure the continuous progress of the reforming reaction and improve the yield and quality of hydrogen.

[0046] The construction machinery of the embodiment of the present application includes: a main body, an electrical device, and the drive system 100 of the above embodiment. The electrical device is provided on the main body; the drive system 100 is provided on the main body, and the power battery 2 is electrically connected to the electrical device to supply power to the electrical device.

[0047] The construction machinery of the embodiment of the present application includes the drive system 100 of the above embodiment. By making the displacement of the methanol engine 32 less than 8 liters, the methanol engine 32 can have high combustion performance, so that the methanol engine 32 can burn sufficiently, thereby avoiding the probability of formic acid generation in the methanol engine 32, making the methanol engine 32 not easily corroded, and increasing the lifespan of the methanol power extender 3. Through the methanol reforming hydrogen generator 4 and the fuel cell 5, electricity can be generated through methanol, which can increase the charging amount of the power battery 2. That is to say, by the combined power generation method of the fuel cell 5 and the methanol power extender 3, the requirements of the construction machinery of the embodiment of the present application can be met. Thus, the construction machinery of the embodiment of the present application can improve the combustion performance of the methanol engine 32 of the methanol power extender 3 when the demand for range-extended power generation can be satisfied, so that the methanol engine 32 can burn completely.

[0048] The construction machinery control method of the embodiment of the present application is applied to construction machinery, which includes: a main body, an electrical device, and a drive system. The electrical device is provided on the main body; the drive system includes: a methanol storage tank, a power battery, a methanol power extender, a methanol reforming hydrogen generator, a high-temperature fuel cell, and a low-temperature fuel cell. The methanol storage tank is used to store methanol; the power battery is electrically connected to the electrical device to supply power to the electrical device; the methanol power extender includes a methanol generator and a methanol engine, the displacement of the methanol engine is less than 8 liters, the methanol engine is connected to the methanol storage tank to be able to receive methanol, the methanol engine is connected to the methanol generator to drive the methanol generator to generate electricity by burning methanol, and the methanol generator is electrically connected to the power battery to be able to charge the power battery; the methanol reforming hydrogen generator is connected to the methanol storage tank to be able to receive methanol, and the methanol reforming hydrogen generator is used to produce hydrogen through methanol; the high-temperature fuel cell and the low-temperature fuel cell are arranged in parallel, and both the high-temperature fuel cell and the low-temperature fuel cell are connected to the methanol reforming hydrogen generator to be able to receive hydrogen, and both the high-temperature fuel cell and the low-temperature fuel cell are electrically connected to the power battery to be able to charge the power battery.

[0049] As Figure 2 shown, the construction machinery control method includes: S100. Obtain the remaining power of the power battery, and compare the remaining power of the power battery with a first threshold, where the first threshold is used to characterize the power state of the power battery; S200. According to the remaining power of the power battery being less than the first threshold, start the methanol power extender, control the high-temperature fuel cell to preheat, and control the low-temperature fuel cell to operate; S300. Obtain the preheating state of the high-temperature fuel cell, and determine whether the high-temperature fuel cell has completed preheating; S400. According to the high-temperature fuel cell completing preheating, control the high-temperature fuel cell to operate, and turn off the low-temperature fuel cell.

[0050] As an example, the first threshold is 25% - 40% of the power battery's power.

[0051] Through step S100, the power state of the power battery can be accurately judged. When the remaining power is lower than the first threshold, it indicates that the power battery has insufficient power and needs range-extending power generation. Thus, corresponding charging measures can be started in a timely manner to avoid over-discharging of the power battery, extend its service life, and at the same time ensure that the vehicle has sufficient power supply to maintain normal operation.

[0052] In step S200, when the power battery has insufficient power, start the methanol power extender to charge the power battery, control the high-temperature fuel cell to preheat, and control the low-temperature fuel cell to operate. Thus, the characteristics of the low-temperature fuel cell starting quickly can be utilized to timely supplement power to the power battery during the preheating period of the high-temperature fuel cell, so as to meet the range-extending power generation requirements of the construction machinery.

[0053] In steps S300 and S400, by obtaining the preheating state of the high-temperature fuel cell, after the high-temperature fuel cell completes preheating, control the high-temperature fuel cell to operate and turn off the low-temperature fuel cell. Since the high-temperature fuel cell has a high power generation efficiency, putting it into operation after the high-temperature fuel cell completes preheating can improve the overall power generation efficiency, effectively utilize energy, and reduce fuel consumption and operating costs.

[0054] As Figure 3 shown, in some embodiments, the construction machinery control method further includes: S500. Obtain the remaining power of the power battery, and compare the remaining power of the power battery with a second threshold, where the second threshold is used to characterize the power state of the power battery, and the second threshold is less than the first threshold.

[0055] S600. According to the remaining power of the power battery being less than the second threshold, turn on the low-temperature fuel cell.

[0056] As some examples, the second threshold is 20% of the power battery's power.

[0057] Obtain the remaining power of the power battery through S500 and compare it with the second threshold, so as to achieve more refined monitoring of the power battery power. The second threshold is less than the first threshold, which means that when the power drops to a lower level, it is necessary to further increase the range of power generation.

[0058] In S600, the low-temperature fuel cell is turned on. That is to say, both the high-temperature fuel cell and the low-temperature fuel cell are turned on. When the remaining power of the power battery is less than the second threshold, turning on the low-temperature fuel cell and the high-temperature fuel cell simultaneously can significantly enhance the power supply capacity to the power battery. When the low-temperature fuel cell and the high-temperature fuel cell work simultaneously, more electric energy can be output to charge the power battery to meet the high power demand of construction machinery.

[0059] As Figure 4 shown, in some embodiments, the electrical equipment includes a drive motor for driving the movement of the main body, and the construction machinery control method further includes: S700, obtain the output power of the drive motor, calculate the power ratio of the output power of the drive motor relative to the rated power of the drive motor, and compare the power ratio with the third threshold, where the third threshold is used to characterize the ratio state of the output power of the drive motor relative to the rated power of the drive motor; S800, according to the power ratio being greater than the third threshold, obtain the remaining power of the power battery, and compare the remaining power of the power battery with the fourth threshold, where the fourth threshold is used to characterize the power state of the power battery, and the fourth threshold is greater than the first threshold; S900, according to the remaining power of the power battery being less than the fourth threshold, start the methanol-powered range extender and control the low-temperature fuel cell to work; S1000, obtain the preheating state of the high-temperature fuel cell and determine whether the high-temperature fuel cell has completed preheating; S1100, according to the high-temperature fuel cell completing preheating, control the high-temperature fuel cell to work.

[0060] As an example, the third threshold is 70% - 80%.

[0061] As an example, the fourth threshold is 50% of the power battery power.

[0062] In S700, by obtaining the output power of the drive motor and calculating the power ratio of the output power of the drive motor relative to the rated power, the load state of the drive motor can be accurately evaluated. Comparing the power ratio with the third threshold can determine the current power demand situation of the vehicle. When the power ratio is greater than the third threshold, it means that the construction machinery is in a high power demand state. At this time, it is necessary to determine whether the power of the power battery can meet this high demand.

[0063] In S800, when the power ratio is greater than the third threshold, further obtain the remaining power of the power battery and compare it with the fourth threshold. If the remaining power of the power battery is less than the fourth threshold, it indicates that under the current high power demand, the power of the power battery may not be sufficient to maintain for a long time, and it is necessary to plan to replenish the power in advance to avoid power shortage.

[0064] In S900, according to the remaining power of the power battery being less than the fourth threshold, start the methanol-powered range extender and control the low-temperature fuel cell to work, which can timely replenish power for the power battery and meet the power supply under high power demand.

[0065] In S1000 and S1100, by obtaining the preheating state of the high-temperature fuel cell and controlling the high-temperature fuel cell to work after the high-temperature fuel cell is preheated, the start-up process of the high-temperature fuel cell is optimized. At this time, both the high-temperature fuel cell and the low-temperature fuel cell are working, which can significantly enhance the power supply capacity for the power battery. When the high-temperature fuel cell and the low-temperature fuel cell work simultaneously, more electric energy can be output to charge the power battery and meet the high power demand of construction machinery for electricity.

[0066] As Figure 5 shown, in some embodiments, the construction machinery control method further includes: S1200. Obtain the remaining power of the power battery and compare the remaining power of the power battery with the overcharge threshold, where the overcharge threshold is used to characterize the power state of the power battery, and the overcharge threshold is greater than the first threshold; S1300. According to the remaining power of the power battery being greater than or equal to the overcharge threshold, control to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell.

[0067] It should be noted that when controlling to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell, the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell can be in the on state or the off state. By controlling to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell, it can be ensured that the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell are in the off state.

[0068] As an example, the overcharge threshold is 75% - 80% of the power battery power.

[0069] In S1200, comparing the remaining power of the power battery with the overcharge threshold can monitor in real time whether the power battery may be overcharged.

[0070] In S1300, when it is determined that the remaining power of the power battery is greater than or equal to the overcharge threshold, control is performed to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell. Continuous operation of the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell may cause overcharge, and it is possible to avoid waste of energy caused by the continued operation of the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell when the battery is fully charged.

[0071] As Figure 6 shown, in some embodiments, the construction machinery control method further includes: S1400. In response to the charging of the construction machinery, control is performed to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell.

[0072] It should be noted that when controlling to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell, the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell may be in the on state or the off state. By controlling to turn off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell, it can be ensured that the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell are in the off state.

[0073] When the construction machinery is charging, the external power supply provides energy for it. At this time, if the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell continue to operate, the methanol in the methanol storage tank will be consumed. Turning off the methanol-powered range extender, the high-temperature fuel cell, and the low-temperature fuel cell can effectively avoid unnecessary consumption of energy, make the energy be used more reasonably, and reduce the operation cost.

[0074] As described above, the above are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A drive system, characterized in that, Comprising: A methanol storage tank for storing methanol; A power battery for electrically connecting to an electrical device to supply power to the electrical device; A methanol-powered range extender, including a methanol generator and a methanol engine, the displacement of the methanol engine being less than 8 liters, the methanol engine being connected to the methanol storage tank to be able to receive methanol, the methanol engine being connected to the methanol generator to drive the methanol generator to generate electricity by burning methanol, and the methanol generator being electrically connected to the power battery to be able to charge the power battery; A methanol reforming hydrogen generator, connected to the methanol storage tank to be able to receive methanol, and the methanol reforming hydrogen generator is used to produce hydrogen by methanol; A fuel cell, connected to the methanol reforming hydrogen generator to be able to receive hydrogen, the fuel cell is used to generate electricity by hydrogen, and the fuel cell is electrically connected to the power battery to be able to charge the power battery.

2. The drive system according to claim 1, wherein The fuel cell includes a high-temperature fuel cell and a low-temperature fuel cell, the high-temperature fuel cell and the low-temperature fuel cell are arranged in parallel, both the high-temperature fuel cell and the low-temperature fuel cell are connected to the methanol reforming hydrogen generator to be able to receive hydrogen, both the high-temperature fuel cell and the low-temperature fuel cell are electrically connected to the power battery to be able to charge the power battery, and the low-temperature fuel cell is used to work when the high-temperature fuel cell is preheating and is used to turn off when the high-temperature fuel cell is working.

3. The drive system according to claim 2, characterized in that, The drive system further includes a pressure swing adsorption device, the inlet of the pressure swing adsorption device is connected to the methanol reforming hydrogen generator to be able to receive hydrogen and purify the hydrogen, and the outlet of the pressure swing adsorption device is connected to the low-temperature fuel cell to be able to transport the purified hydrogen to the low-temperature fuel cell.

4. The drive system according to any one of claims 1 to 3, characterized in that The drive system further includes a water tank for storing water, and the water tank is connected to the methanol reforming hydrogen generator to be able to transport water into the methanol reforming hydrogen generator.

5. An engineering machinery, characterized in that, Comprising: A main body; An electrical device provided on the main body; The drive system according to any one of claims 1 to 4, provided on the main body, and the power battery is electrically connected to the electrical device to supply power to the electrical device.

6. A construction machinery control method, characterized in that, Applied to construction machinery, the construction machinery includes A main body; An electrical device provided on the main body; A drive system, the drive system includes: A methanol storage tank for storing methanol; A power battery, electrically connected to the electrical device to supply power to the electrical device; A methanol-powered range extender, including a methanol generator and a methanol engine, the displacement of the methanol engine being less than 8 liters, the methanol engine being connected to the methanol storage tank to be able to receive methanol, the methanol engine being connected to the methanol generator to drive the methanol generator to generate electricity by burning methanol, and the methanol generator being electrically connected to the power battery to be able to charge the power battery; A methanol reforming hydrogen generator, connected to the methanol storage tank to be able to receive methanol, and the methanol reforming hydrogen generator is used to produce hydrogen by methanol; High-temperature fuel cells and low-temperature fuel cells, the high-temperature fuel cells and the low-temperature fuel cells are arranged in parallel, and both the high-temperature fuel cells and the low-temperature fuel cells are connected to the methanol reforming hydrogen generator to be able to receive hydrogen, and both the high-temperature fuel cells and the low-temperature fuel cells are electrically connected to the power battery to be able to charge the power battery; The construction machinery control method includes: Obtain the remaining power of the power battery, and compare the remaining power of the power battery with a first threshold, where the first threshold is used to characterize the power state of the power battery; According to the remaining power of the power battery being less than the first threshold, start the methanol power extender, control the preheating of the high-temperature fuel cell, and control the low-temperature fuel cell to work; Obtain the preheating state of the high-temperature fuel cell and determine whether the high-temperature fuel cell has completed preheating; According to the high-temperature fuel cell completing preheating, control the high-temperature fuel cell to work and turn off the low-temperature fuel cell.

7. The construction machinery control method according to claim 6, characterized in that, The construction machinery control method further includes: Obtain the remaining power of the power battery, and compare the remaining power of the power battery with a second threshold, where the second threshold is used to characterize the power state of the power battery, and the second threshold is less than the first threshold; According to the remaining power of the power battery being less than the second threshold, turn on the low-temperature fuel cell.

8. The construction machinery control method according to claim 6, characterized in that, The electrical equipment includes a drive motor for driving the movement of the main body, and the construction machinery control method further includes: Obtain the output power of the drive motor, calculate the power ratio of the output power of the drive motor relative to the rated power of the drive motor, and compare the power ratio with a third threshold, where the third threshold is used to characterize the ratio state of the output power of the drive motor relative to the rated power of the drive motor; According to the power ratio being greater than the third threshold, obtain the remaining power of the power battery, and compare the remaining power of the power battery with a fourth threshold, where the fourth threshold is used to characterize the power state of the power battery, and the fourth threshold is greater than the first threshold; According to the remaining power of the power battery being less than the fourth threshold, start the methanol power extender and control the low-temperature fuel cell to work; Obtain the preheating state of the high-temperature fuel cell and determine whether the high-temperature fuel cell has completed preheating; According to the high-temperature fuel cell completing preheating, control the high-temperature fuel cell to work.

9. The construction machinery control method according to claim 6, wherein The construction machinery control method further includes: Obtain the remaining power of the power battery, and compare the remaining power of the power battery with an overcharge threshold, where the overcharge threshold is used to characterize the power state of the power battery, and the overcharge threshold is greater than the first threshold; According to the remaining power of the power battery being greater than or equal to the overcharge threshold, control to turn off the methanol power extender, the high-temperature fuel cell, and the low-temperature fuel cell.

10. The construction machinery control method according to claim 6, wherein The construction machinery control method further includes: In response to the charging of the construction machinery, control to turn off the methanol power extender, the high-temperature fuel cell, and the low-temperature fuel cell.

Images