Drive system, working machine and working machine control method

Abstract

The application discloses a driving system, an engineering machine and an engineering machine control method, wherein the driving system comprises a methanol storage tank, a power battery, a methanol power 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 with an electric device; 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 is connected with the methanol generator, and the methanol generator is connected with the methanol engine; the methanol reforming hydrogen generator is connected with the methanol storage tank; the fuel cell is connected with the methanol reforming hydrogen generator, the fuel cell generates electricity through hydrogen, and the fuel cell is electrically connected with the power battery to charge the power battery. The driving system can improve the combustion performance of the methanol engine of the methanol power range extender under the condition of meeting the range extension power generation demand of the heavy engineering machine, so that the methanol engine can be completely combusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of range extender of construction machinery, and particularly relates to a driving system, a construction machinery and a control method of the construction machinery. BACKGROUND

[0002] In the prior art, a heavy construction machinery (for example, a heavy truck, a ship, an agricultural machinery, etc.) is extended by a methanol power range extender. The methanol power range extender generates electricity by methanol fuel, so as to charge a power battery or directly supply power to a driving motor, thereby prolonging the driving range of the construction machinery.

[0003] However, the engine of the methanol power range extender of the heavy construction machinery is not completely combusted, which causes formic acid to be easily generated in the engine, thereby causing the engine of the methanol power range extender to be easily corroded, and further causing the service life of the engine of the methanol power range extender to be reduced. SUMMARY

[0004] The present application is made based on the discovery and realization of the inventors on the following facts and problems:

[0005] The inventors of the present application find that when the displacement of the engine of the methanol power range extender is less than 8 liters, the combustion performance of the engine is better, and the engine is completely combusted. However, the engine with the displacement less than 8 liters is difficult to meet the requirements of the heavy construction machinery. That is, in the heavy construction machinery in the prior art, the displacement of the engine of the methanol power range extender is greater than 8 liters, which causes the engine to be not completely combusted, thereby causing formic acid to be easily generated in the engine.

[0006] The purpose of the present application is to at least solve the problem of incomplete combustion of the engine of the methanol power range extender of the heavy construction machinery in the prior art. The purpose is achieved in the following way:

[0007] A first aspect of the present application provides a driving system, comprising: a methanol storage tank, a power battery, a methanol power range extender, a methanol reforming hydrogen generator and a fuel cell. The methanol storage tank is used to store methanol; the power battery is used to be electrically connected with an electric device, so as to supply power to the electric device; 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 engine is connected with the methanol storage tank to be able to receive methanol, the methanol engine is connected with the methanol generator to drive the methanol generator to generate electricity by combusting methanol, and the methanol generator is electrically connected with the power battery to be able to charge the power battery; the methanol reforming hydrogen generator is connected with the methanol storage tank to be able to receive methanol, and is used to generate hydrogen by methanol; the fuel cell is connected with the methanol reforming hydrogen generator to be able to receive hydrogen, and is used to generate electricity by hydrogen, and the fuel cell is electrically connected with the power battery to be able to charge the power battery.

[0008] The driving system of the present application can make the methanol engine have higher combustion performance by making the displacement of the methanol engine less than 8 liters, so that the methanol engine can burn completely, thereby avoiding the probability of generating formic acid in the methanol engine, so that the methanol engine is not easy to be corroded, thereby increasing the service life of the methanol power booster. The methanol reforming hydrogen generator and the fuel cell can generate electricity by methanol, which can increase the charging capacity of the power battery, that is, by the combined power generation mode of the fuel cell and the methanol power booster, the demand of heavy engineering machinery can be met. Therefore, the driving system of the embodiment of the present application can improve the combustion performance of the methanol engine of the methanol power booster while meeting the power extension power generation demand of heavy engineering machinery, so that the methanol engine can burn completely.

[0009] 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, the high-temperature fuel cell and the low-temperature fuel cell are connected with the methanol reforming hydrogen generator to receive hydrogen, the high-temperature fuel cell and the low-temperature fuel cell are electrically connected with the power battery to charge the power battery, the low-temperature fuel cell is used to work when the high-temperature fuel cell is preheated, and is used to be closed when the high-temperature fuel cell works.

[0010] In some embodiments, the driving system further includes a pressure swing adsorption device, an inlet of the pressure swing adsorption device is connected with the methanol reforming hydrogen generator to receive hydrogen and purify hydrogen, and an outlet of the pressure swing adsorption device is connected with the low-temperature fuel cell to deliver purified hydrogen to the low-temperature fuel cell.

[0011] In some embodiments, the driving system further includes a water tank, the water tank is used to store water, and the water tank is connected with the methanol reforming hydrogen generator to deliver water to the methanol reforming hydrogen generator.

[0012] The second aspect of the present application provides an engineering machinery, comprising: a main body, an electrical equipment and a driving system as described in the first aspect above. The electrical equipment is arranged on the main body; the driving system is arranged on the main body, and the power battery is electrically connected with the electrical equipment to supply power to the electrical equipment.

[0013] The construction machinery of the present application comprises the driving system of the first aspect, and the methanol engine can have high combustion performance by making the displacement of the methanol engine less than 8 liters, so that the methanol engine can be fully combusted, and the probability of generating formic acid in the methanol engine is avoided, so that the methanol engine is not easy to be corroded, and the service life of the methanol power booster is increased. The methanol reforming hydrogen generator and the fuel cell can generate electricity by methanol, and the charging capacity of the power battery can be increased, that is, the power generation mode of the fuel cell and the methanol power booster in combination can meet the demand of the construction machinery of the present application. Therefore, the construction machinery of the present application can improve the combustion performance of the methanol engine of the methanol power booster under the condition that the power generation demand can be met, so that the methanol engine can be fully combusted.

[0014] The third aspect of the present application provides a construction machinery control method applied to a construction machinery, wherein the construction machinery comprises a main body, an electrical equipment and a driving system. The electrical equipment is arranged on the main body; the driving system comprises a methanol storage tank, a power battery, a methanol power booster, a methanol reforming hydrogen generator, a high-temperature fuel cell and a low-temperature fuel cell. The methanol storage tank is used for storing methanol; the power battery is electrically connected with the electrical equipment to supply power to the electrical equipment; the methanol power booster comprises a methanol generator and a methanol engine, the displacement of the methanol engine is less than 8 liters, the methanol engine is connected with the methanol storage tank to receive methanol, the methanol engine is connected with the methanol generator to drive the methanol generator to generate electricity by combusting methanol, and the methanol generator is electrically connected with the power battery to charge the power battery; the methanol reforming hydrogen generator is connected with the methanol storage tank to receive methanol, and is used for generating hydrogen by 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 with the methanol reforming hydrogen generator to receive hydrogen, and both the high-temperature fuel cell and the low-temperature fuel cell are electrically connected with the power battery to charge the power battery.

[0015] The construction machinery control method comprises:

[0016] obtaining the remaining power of the power battery, and comparing the remaining power of the power battery with a first threshold value, wherein the first threshold value is used to represent the state of charge of the power battery;

[0017] starting the methanol power booster according to the remaining power of the power battery being less than the first threshold value, controlling the high-temperature fuel cell to preheat, and controlling the low-temperature fuel cell to work;

[0018] acquire a preheating state of the high-temperature fuel cell, and determine whether the high-temperature fuel cell is preheated;

[0019] according to the high-temperature fuel cell being preheated, control the high-temperature fuel cell to work, and close the low-temperature fuel cell.

[0020] The construction machinery control method provided in the application can accurately determine the power state of the power battery by acquiring the residual power of the power battery and comparing the residual power of the power battery with a first threshold. When the residual power is lower than the first threshold, it indicates that the power battery is insufficient in power, and the power range extension power generation needs to be performed, so that the corresponding charging measures can be started in time to avoid excessive discharge of the power battery, prolong the service life of the power battery, and ensure sufficient power supply of the vehicle to maintain normal operation. When the power battery is insufficient in power, the methanol power range extender is started to charge the power battery, the high-temperature fuel cell is preheated, and the low-temperature fuel cell is controlled to work, so that the low-temperature fuel cell can be used to start quickly, and the power of the power battery can be supplemented in time during the preheating of the high-temperature fuel cell to meet the power range extension power generation demand of the construction machinery. By acquiring the preheating state of the high-temperature fuel cell and determining whether the high-temperature fuel cell is preheated, and according to the high-temperature fuel cell being preheated, the high-temperature fuel cell is controlled to work, and the low-temperature fuel cell is closed. By acquiring the preheating state of the high-temperature fuel cell, the high-temperature fuel cell is controlled to work and the low-temperature fuel cell is closed after the high-temperature fuel cell is preheated. Since the high-temperature fuel cell has high power generation efficiency, the high-temperature fuel cell can be put into work after preheating is completed, the overall power generation efficiency can be improved, energy can be effectively utilized, and fuel consumption and operating cost can be reduced.

[0021] In some embodiments, the construction machinery control method comprises:

[0022] acquire the residual power of the power battery, and compare the residual power of the power battery with a second threshold, wherein the second threshold is used to represent the power state of the power battery, and the second threshold is less than the first threshold;

[0023] according to the residual power of the power battery being less than the second threshold, start the low-temperature fuel cell.

[0024] In some embodiments, the power utilization device comprises a driving motor for driving the main body to move, and the construction machinery control method further comprises:

[0025] obtaining an output power of the driving motor, calculating a power ratio of the output power of the driving motor relative to a rated power of the driving motor, and comparing the power ratio with a third threshold value, wherein the third threshold value is used to represent a ratio state of the output power of the driving motor relative to the rated power of the driving motor;

[0026] According to the power ratio being greater than the third threshold value, obtaining a remaining electric quantity of the power battery, and comparing the remaining electric quantity of the power battery with a fourth threshold value, wherein the fourth threshold value is used to represent an electric quantity state of the power battery, and the fourth threshold value is greater than the first threshold value;

[0027] According to the remaining electric quantity of the power battery being less than the fourth threshold value, starting the methanol power booster, and controlling the low-temperature fuel cell to work;

[0028] obtaining a preheating state of the high-temperature fuel cell, and determining whether the high-temperature fuel cell is preheated;

[0029] According to the high-temperature fuel cell being preheated, controlling the high-temperature fuel cell to work.

[0030] In some embodiments, the engineering machinery control method further comprises:

[0031] obtaining a remaining electric quantity of the power battery, and comparing the remaining electric quantity of the power battery with an overshoot threshold value, wherein the overshoot threshold value is used to represent an electric quantity state of the power battery, and the overshoot threshold value is greater than the first threshold value;

[0032] According to the remaining electric quantity of the power battery being greater than or equal to the overshoot threshold value, controlling to close the methanol power booster, the high-temperature fuel cell and the low-temperature fuel cell.

[0033] In some embodiments, the engineering machinery control method further comprises:

[0034] In response to the engineering machinery being charged, controlling to close the methanol power booster, the high-temperature fuel cell and the low-temperature fuel cell. BRIEF DESCRIPTION OF DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered limitations of the present application. Moreover, in the drawings, like reference numerals refer to similar components, wherein:

[0036] Figure 1 a schematic diagram of a driving system of an embodiment of the present application;

[0037] Figure 2a schematic diagram of an engineering machine control method according to a further embodiment of the present application;

[0038] Figure 3 a schematic diagram of an engineering machine control method according to a further embodiment of the present application;

[0039] Figure 4 a schematic diagram of an engineering machine control method according to a further embodiment of the present application;

[0040] Figure 5 a schematic diagram of an engineering machine control method according to a further embodiment of the present application;

[0041] Figure 6 a schematic diagram of an engineering machine control method according to a further embodiment of the present application.

[0042] The various elements of the drawings are designated as follows:

[0043] 100, drive system;

[0044] 1, methanol storage tank;

[0045] 2, power battery;

[0046] 3, methanol power booster; 31, methanol generator; 32, methanol engine;

[0047] 4, methanol reforming hydrogen generator;

[0048] 5, fuel cell; 51, high-temperature fuel cell; 52, low-temperature fuel cell;

[0049] 6, pressure swing adsorption device;

[0050] 7, water tank. DETAILED DESCRIPTION

[0051] Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is to be understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0052] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of 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 groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0053] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three or more, unless otherwise specifically defined.

[0054] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0055] In the description of the application, the directions or positional relationships indicated by 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" and the like are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the prior art, heavy engineering machinery (for example, heavy trucks, ships, agricultural machinery, etc.) is extended by a methanol power extender. The methanol power extender generates power through methanol fuel, thereby charging the power battery or directly supplying power to the driving motor, thereby prolonging the driving range of the engineering machinery.

[0058] However, the engine of the methanol power extender of the heavy engineering machinery is not completely combusted, which causes formic acid to be easily produced in the engine, thereby causing the engine of the methanol power extender to be easily corroded, and thereby causing the service life of the engine of the methanol power extender to be reduced.

[0059] The present application is made based on the discovery and understanding of the inventors on the following facts and problems:

[0060] The inventors of the present application found that when the displacement of the engine of the methanol power extender is less than 8 liters, the combustion performance of the engine is better, and the engine is completely combusted. However, the engine with a displacement of less than 8 liters is difficult to meet the needs of heavy engineering machinery. That is, in the prior art, the displacement of the engine of the methanol power extender in the heavy engineering machinery is greater than 8 liters, which causes the engine to be not completely combusted, thereby causing formic acid to be easily produced in the engine.

[0061] To at least address the problem of incomplete combustion in the engines of methanol-powered range extenders for heavy-duty construction machinery in the prior art, embodiments of this application propose a drive system 100 that 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-duty construction machinery, thereby enabling the methanol engine 32 to achieve complete combustion.

[0062] The embodiments of this application also propose an engineering machine applicable to the drive system 100 of the above embodiments.

[0063] Based on the same inventive concept, embodiments of this application also propose a method for controlling engineering machinery.

[0064] The following describes, with reference to the accompanying drawings, an embodiment of the drive system 100, construction machinery, and a control method for construction machinery according to this application.

[0065] like Figure 1 As shown, the drive system 100 of this embodiment includes: a methanol storage tank 1, a power battery 2, a methanol power range extender 3, a methanol reforming hydrogen generator 4, and a fuel cell 5. The methanol storage tank 1 stores methanol; the power battery 2 is electrically connected to electrical equipment to supply power; the methanol power range extender 3 includes a methanol generator 31 and a methanol engine 32, the methanol engine 32 having a displacement of less than 8 liters, the methanol engine 32 being connected to the methanol storage tank 1 to receive methanol, and the methanol engine 32 being connected to the methanol generator 31 to drive the methanol generator 31 to generate electricity by burning methanol, the methanol generator 31 being electrically connected to the power battery 2 to charge the power battery 2; the methanol reforming hydrogen generator 4 is connected to the methanol storage tank 1 to receive methanol, and the methanol reforming hydrogen generator 4 is used to generate hydrogen from methanol; the fuel cell 5 is connected to the methanol reforming hydrogen generator 4 to receive hydrogen, the fuel cell 5 is used to generate electricity from hydrogen, and the fuel cell 5 is electrically connected to the power battery 2 to charge the power battery 2.

[0066] When the power battery 2 needs to be charged, the methanol power range extender 3 is started. The methanol storage tank 1 supplies methanol to the methanol engine 32. The methanol engine 32 burns the methanol and drives the methanol generator 31 to generate electricity. The methanol generator 31 charges the power battery 2. The methanol reforming hydrogen generator 4 is started. The methanol storage tank 1 supplies methanol to the methanol reforming hydrogen generator 4. The methanol reforming hydrogen generator 4 produces hydrogen from the methanol and delivers the hydrogen to the fuel cell 5. The fuel cell 5 generates electricity from the hydrogen and charges the power battery 2.

[0067] By making the displacement of the methanol engine 32 less than 8 liters, the methanol engine 32 can have higher combustion performance, so that the methanol engine 32 can be fully combusted, thereby avoiding the probability of generating formic acid in the methanol engine 32, so that the methanol engine 32 is not easy to be corroded, thereby increasing the service life of the methanol power booster 3.

[0068] By the methanol reforming hydrogen generator 4 and the fuel cell 5, electricity can be generated by methanol, and the charging amount of the power battery 2 can be increased, that is, by the combined power generation of the fuel cell 5 and the methanol power booster 3, the demand of the heavy engineering machinery can be met.

[0069] Therefore, the driving system 100 of the embodiment of the application can improve the combustion performance of the methanol engine 32 of the methanol power booster 3 under the condition of meeting the range-extended power generation demand of the heavy engineering machinery, so that the methanol engine 32 can be fully combusted.

[0070] As shown in Figure 1 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 connected in parallel, 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, 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, and the low-temperature fuel cell 52 is used to work when the high-temperature fuel cell 51 is preheated and is used to be closed when the high-temperature fuel cell 51 works.

[0071] The low-temperature fuel cell 52 has a fast start speed, and during the preheating stage of the high-temperature fuel cell 51, the low-temperature fuel cell 52 can quickly start to work, thereby timely charging the power battery 2, and further making the power generation amount of the fuel cell 5 and the methanol power booster 3 meet the demand of the heavy engineering machinery.

[0072] The high-temperature fuel cell 51 has a high power generation efficiency, and after the high-temperature fuel cell 51 is preheated and normally works, more hydrogen chemical energy can be converted into electric energy. When the high-temperature fuel cell 51 works, the low-temperature fuel cell 52 is closed, which can more effectively utilize fuel, thereby reducing fuel consumption and reducing operating costs.

[0073] The driving system 100 of the embodiment of the application reasonably utilizes the characteristics of the fast start of the low-temperature fuel cell 52 and the high efficiency of the high-temperature fuel cell 51, realizes the optimal allocation of resources, and makes the entire fuel cell 5 have good performance.

[0074] As shown in Figure 1As shown, in some embodiments, the drive system 100 further includes a pressure swing adsorption (PSA) device 6, the inlet of which is connected to a methanol reforming hydrogen generator 4 to receive and purify hydrogen, and the outlet of which is connected to a cryogenic fuel cell 52 to deliver purified hydrogen to the cryogenic fuel cell 52.

[0075] The pressure swing adsorption (PSA) device 6 can purify hydrogen, thereby removing impurities such as carbon monoxide, carbon dioxide, and water vapor. This reduces the probability of catalyst poisoning in the cryogenic fuel cell 52, thus minimizing damage to the fuel cell and extending its lifespan. Furthermore, the purification process by the PSA device 6 increases the purity of the hydrogen entering the cryogenic fuel cell 52, contributing to its more stable and efficient operation.

[0076] like Figure 1 As shown, in some embodiments, the drive system 100 further includes a water tank 7 for storing water, which is connected to the methanol reforming hydrogen generator 4 to supply water to the methanol reforming hydrogen generator 4.

[0077] Water tank 7 provides a stable water source for the methanol reforming hydrogen generator, enabling methanol and water to undergo a reforming reaction under certain conditions to produce hydrogen and carbon dioxide. An ample water supply helps ensure the continuous progress of the reforming reaction, improving both the yield and quality of hydrogen.

[0078] The engineering machinery of this application embodiment includes: a main body, electrical equipment, and a drive system 100 as described in the above embodiment. The electrical equipment is located on the main body; the drive system 100 is located on the main body, and the power battery 2 is electrically connected to the electrical equipment to supply power to the electrical equipment.

[0079] The engineering machinery of this application embodiment includes the drive system 100 as described in the above embodiment. By reducing the displacement of the methanol engine 32 to less than 8 liters, the methanol engine 32 can achieve higher combustion performance, ensuring complete combustion and reducing the probability of formic acid production. This makes the methanol engine 32 less susceptible to corrosion, thereby increasing the lifespan of the methanol power range extender 3. The methanol reforming hydrogen generator 4 and fuel cell 5 can generate electricity from methanol, increasing the charging capacity of the power battery 2. In other words, the combined power generation by the fuel cell 5 and the methanol power range extender 3 can meet the needs of the engineering machinery of this application embodiment. Therefore, the engineering machinery of this application embodiment, while meeting the power generation needs, can improve the combustion performance of the methanol engine 32 of the methanol power range extender 3, ensuring complete combustion of the methanol engine 32.

[0080] The construction machinery control method of the embodiment of the application is applied to a construction machinery, and the construction machinery comprises a main body, an electric device and a driving system. The electric device is arranged on the main body; the driving system comprises a methanol storage tank, a power battery, a methanol power range extender, a methanol reforming hydrogen generator, a high-temperature fuel cell and a low-temperature fuel cell. The methanol storage tank is used for storing methanol; the power battery is electrically connected with the electric device to supply power to the electric device; 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 engine is connected with the methanol storage tank to be able to receive methanol, the methanol engine is connected with the methanol generator to drive the methanol generator to generate power by burning methanol, and the methanol generator is electrically connected with the power battery to be able to charge the power battery; the methanol reforming hydrogen generator is connected with the methanol storage tank to be able to receive methanol, and the methanol reforming hydrogen generator is used for generating hydrogen by methanol; the high-temperature fuel cell and the low-temperature fuel cell are arranged in parallel, the high-temperature fuel cell and the low-temperature fuel cell are both connected with the methanol reforming hydrogen generator to be able to receive hydrogen, and the high-temperature fuel cell and the low-temperature fuel cell are both electrically connected with the power battery to be able to charge the power battery.

[0081] As shown in Figure 2 , the construction machinery control method comprises:

[0082] S100, acquiring the residual capacity of the power battery, and comparing the residual capacity of the power battery with a first threshold value, wherein the first threshold value is used to represent the state of charge of the power battery;

[0083] S200, starting the methanol power range extender according to the residual capacity of the power battery being less than the first threshold value, controlling the high-temperature fuel cell to preheat, and controlling the low-temperature fuel cell to work;

[0084] S300, acquiring the preheating state of the high-temperature fuel cell, and judging whether the high-temperature fuel cell completes preheating;

[0085] S400, controlling the high-temperature fuel cell to work and closing the low-temperature fuel cell according to the high-temperature fuel cell completing preheating.

[0086] As an example, the first threshold value is 25% to 40% of the power battery capacity.

[0087] Through step S100, the state of charge of the power battery can be accurately judged. When the residual capacity is lower than the first threshold value, it indicates that the power battery is insufficient, and the power needs to be extended to generate electricity, so that the corresponding charging measures can be started in time to avoid excessive discharge of the power battery, prolong the service life of the power battery, and ensure that the vehicle has sufficient power supply and maintains normal operation.

[0088] In step S200, when the power battery is insufficient, the methanol power range extender is started to charge the power battery, the high-temperature fuel cell is controlled to preheat, and the low-temperature fuel cell is controlled to work, so that the low-temperature fuel cell can be started quickly, and the power battery can be charged in time during the preheating of the high-temperature fuel cell, thereby meeting the power generation demand of the engineering machinery.

[0089] In steps S300 and S400, by acquiring the preheating state of the high-temperature fuel cell, after the high-temperature fuel cell is preheated, the high-temperature fuel cell is controlled to work and the low-temperature fuel cell is closed. Since the high-temperature fuel cell has high power generation efficiency, after the high-temperature fuel cell is preheated, the high-temperature fuel cell can be put into work, the overall power generation efficiency can be improved, the energy can be effectively utilized, and the fuel consumption and operation cost can be reduced.

[0090] As shown in Figure 3 In some embodiments, the engineering machinery control method further includes:

[0091] S500, acquiring the remaining power of the power battery, and comparing the remaining power of the power battery with a second threshold, wherein the second threshold is used to represent the power state of the power battery, and the second threshold is less than the first threshold.

[0092] S600, starting the low-temperature fuel cell according to the remaining power of the power battery being less than the second threshold.

[0093] As some examples, the second threshold is 20% of the power battery power.

[0094] By acquiring the remaining power of the power battery through S500 and comparing it with the second threshold, more fine monitoring of the power battery power can be achieved. The second threshold is less than the first threshold, which means that when the power decreases to a lower level, further power generation is needed.

[0095] In S600, the low-temperature fuel cell is started, that is, the high-temperature fuel cell and the low-temperature fuel cell are both started. In the case that the remaining power of the power battery is less than the second threshold, the low-temperature fuel cell and the high-temperature fuel cell are started at the same time, which can significantly enhance the power supply capability of the power battery. The low-temperature fuel cell and the high-temperature fuel cell work at the same time, which can output more power to charge the power battery and meet the high demand of the engineering machinery for power.

[0096] As shown in Figure 4 In some embodiments, the power-consuming device includes a drive motor for driving the movement of the main body, and the engineering machinery control method further includes:

[0097] S700, acquire the output power of the driving motor, calculate the power ratio of the output power of the driving motor relative to the rated power of the driving motor, and compare the power ratio with a third threshold value, wherein the third threshold value is used to represent the power ratio state of the output power of the driving motor relative to the rated power of the driving motor;

[0098] S800, according to the power ratio being greater than the third threshold value, acquiring the remaining power of the power battery, comparing the remaining power of the power battery with a fourth threshold value, wherein the fourth threshold value is used to represent the power state of the power battery, and the fourth threshold value is greater than the first threshold value;

[0099] S900, according to the remaining power of the power battery being less than the fourth threshold value, starting the methanol power range extender and controlling the low-temperature fuel cell to work;

[0100] S1000, acquiring the preheating state of the high-temperature fuel cell and judging whether the high-temperature fuel cell has completed preheating;

[0101] S1100, according to the high-temperature fuel cell completing preheating, controlling the high-temperature fuel cell to work.

[0102] As an example, the third threshold value is 70% to 80%.

[0103] As an example, the fourth threshold value is 50% of the power battery power.

[0104] In S700, by acquiring the output power of the driving motor and calculating the power ratio of the output power of the driving motor relative to the rated power, the load state of the driving motor can be accurately evaluated. Comparing the power ratio with the third threshold value can determine the current power demand of the vehicle. When the power ratio is greater than the third threshold value, it means that the engineering machinery is in a high power demand state, and at this time it is necessary to judge whether the power battery power can meet this high demand.

[0105] In S800, when the power ratio is greater than the third threshold value, the remaining power of the power battery is further acquired and compared with the fourth threshold value. If the remaining power of the power battery is less than the fourth threshold value, it means that under the current high power demand, the power battery power may not be sufficient to maintain for a long time, and it is necessary to plan to supplement the power in advance to avoid the situation of insufficient power.

[0106] In S900, according to the remaining power of the power battery being less than the fourth threshold value, starting the methanol power range extender and controlling the low-temperature fuel cell to work, which can timely supplement the power of the power battery and meet the power supply under high power demand.

[0107] In S1000 and S1100, the preheating state of the high-temperature fuel cell is obtained, and the high-temperature fuel cell is controlled to work after the preheating of the high-temperature fuel cell is completed, so that the starting process of the high-temperature fuel cell is optimized. At this time, the high-temperature fuel cell and the low-temperature fuel cell work, which can significantly enhance the power supply capability of the power battery. The high-temperature fuel cell and the low-temperature fuel cell work at the same time, which can output more electric energy to charge the power battery and meet the high demand of the engineering machinery for electric power.

[0108] As shown in Figure 5 In some embodiments, the engineering machinery control method further includes:

[0109] S1200, obtaining the remaining power of the power battery, and comparing the remaining power of the power battery with an overshoot threshold, wherein the overshoot threshold is used to represent the power state of the power battery, and the overshoot threshold is greater than the first threshold;

[0110] S1300, according to the remaining power of the power battery being greater than or equal to the overshoot threshold, controlling to close the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell.

[0111] It should be noted that when the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell are controlled to be closed, the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell can be in an open state or in a closed state. By controlling to close the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell, it can be ensured that the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell are in a closed state.

[0112] As an example, the overshoot threshold is 75% to 80% of the power battery power.

[0113] In S1200, the remaining power of the power battery is compared with the overshoot threshold, which can monitor in real time whether the power battery is likely to be overcharged.

[0114] In S1300, when the remaining power of the power battery is greater than or equal to the overshoot threshold, the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell are controlled to be closed. The continuous operation of the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell leads to overcharge, and can avoid the waste of energy caused by the continuous operation of the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell when the battery power is sufficient.

[0115] As shown in Figure 6 In some embodiments, the engineering machinery control method further includes:

[0116] S1400, in response to the charging of the engineering machinery, controlling to close the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell.

[0117] It should be noted that when the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell are controlled to be closed, the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell can be in an open state or in a closed state. By controlling the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell to be closed, it can be ensured that the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell are in a closed state.

[0118] When the construction machine is charging, the external power supply provides energy for it. At this time, if the methanol power 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. By closing the methanol power range extender, the high-temperature fuel cell and the low-temperature fuel cell, unnecessary consumption of energy can be effectively avoided, the energy can be more reasonably utilized, and the operating cost can be reduced.

[0119] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in 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 by, The driving system comprises: a methanol storage tank for storing methanol; a power battery for electrically connecting with the electric device to supply power to the electric device; a methanol power booster comprising a methanol generator and a methanol engine, the displacement of the methanol engine being less than 8 liters, the methanol engine being connected with the methanol storage tank to receive methanol, the methanol engine being connected with the methanol generator to drive the methanol generator to generate power by burning methanol, the methanol generator being electrically connected with the power battery to charge the power battery; a methanol reforming hydrogen generator connected with the methanol storage tank to receive methanol, the methanol reforming hydrogen generator being used to generate hydrogen from methanol; a fuel cell connected with the methanol reforming hydrogen generator to receive hydrogen, the fuel cell being used to generate power from hydrogen, the fuel cell being electrically connected with the power battery to charge the power battery; the fuel cell comprises a high-temperature fuel cell and a low-temperature fuel cell, the high-temperature fuel cell and the low-temperature fuel cell being connected in parallel, the high-temperature fuel cell and the low-temperature fuel cell being connected with the methanol reforming hydrogen generator to receive hydrogen, the high-temperature fuel cell and the low-temperature fuel cell being electrically connected with the power battery to charge the power battery, the low-temperature fuel cell being used to work when the high-temperature fuel cell is preheating and being used to be closed when the high-temperature fuel cell is working.

2. The drive system of claim 1, wherein, The driving system further comprises a pressure swing adsorption device, the inlet of the pressure swing adsorption device being connected with the methanol reforming hydrogen generator to receive hydrogen and purify hydrogen, the outlet of the pressure swing adsorption device being connected with the low-temperature fuel cell to deliver purified hydrogen to the low-temperature fuel cell.

3. The drive system according to claim 1 or 2, characterized in that, The driving system further comprises a water tank for storing water, the water tank being connected with the methanol reforming hydrogen generator to deliver water into the methanol reforming hydrogen generator.

4. A working machine, characterized in that The driving system comprises: a main body; an electric device arranged on the main body; a driving system according to any one of claims 1 to 3, the power battery being electrically connected with the electric device to supply power to the electric device.

5. A method of controlling a construction machine, characterized by, The driving system is applied to an engineering machine, the engineering machine comprising a main body; an electric device arranged on the main body; a driving system, the driving system comprising: a methanol storage tank for storing methanol; a power battery electrically connected with the electric device to supply power to the electric device; a methanol power booster comprising a methanol generator and a methanol engine, the displacement of the methanol engine being less than 8 liters, the methanol engine being connected with the methanol storage tank to receive methanol, the methanol engine being connected with the methanol generator to drive the methanol generator to generate power by burning methanol, the methanol generator being electrically connected with the power battery to charge the power battery; a methanol reforming hydrogen generator connected with the methanol storage tank to receive methanol, the methanol reforming hydrogen generator being used to generate hydrogen from methanol; a fuel cell connected with the methanol reforming hydrogen generator to receive hydrogen, the fuel cell being used to generate power from hydrogen, the fuel cell being electrically connected with the power battery to charge the power battery; A high-temperature fuel cell and a 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 comprises: obtaining the remaining power of the power battery, and comparing the remaining power of the power battery with a first threshold value, wherein the first threshold value is used to represent the state of charge of the power battery; According to the remaining power of the power battery being less than the first threshold value, starting the methanol power booster, controlling the high-temperature fuel cell to preheat, and controlling the low-temperature fuel cell to work; obtaining the preheating state of the high-temperature fuel cell, and determining whether the high-temperature fuel cell has completed preheating; According to the high-temperature fuel cell completing preheating, controlling the high-temperature fuel cell to work, and closing the low-temperature fuel cell.

6. The method of controlling a working machine according to claim 5, characterized by, The construction machinery control method further comprises: obtaining the remaining power of the power battery, and comparing the remaining power of the power battery with a second threshold value, wherein the second threshold value is used to represent the state of charge of the power battery, and the second threshold value is less than the first threshold value; According to the remaining power of the power battery being less than the second threshold value, starting the methanol power booster, controlling the high-temperature fuel cell to preheat, and controlling the low-temperature fuel cell to work.

7. The method of controlling a working machine according to claim 5, characterized by, The electric device comprises a driving motor for driving the main body to move, and the construction machinery control method further comprises: obtaining the output power of the driving motor, calculating the power ratio of the output power of the driving motor relative to the rated power of the driving motor, and comparing the power ratio with a third threshold value, wherein the third threshold value is used to represent the ratio state of the output power of the driving motor relative to the rated power of the driving motor; According to the power ratio being greater than the third threshold value, obtaining the remaining power of the power battery, and comparing the remaining power of the power battery with a fourth threshold value, wherein the fourth threshold value is used to represent the state of charge of the power battery, and the fourth threshold value is greater than the first threshold value; According to the remaining power of the power battery being less than the fourth threshold value, starting the methanol power booster, and controlling the low-temperature fuel cell to work; obtaining the preheating state of the high-temperature fuel cell, and determining whether the high-temperature fuel cell has completed preheating; According to the high-temperature fuel cell completing preheating, controlling the high-temperature fuel cell to work.

8. The method of controlling a working machine according to claim 5, characterized by, The construction machinery control method further comprises: obtaining the remaining power of the power battery, and comparing the remaining power of the power battery with a second threshold value, wherein the second threshold value is used to represent the state of charge of the power battery, and the second threshold value is less than the first threshold value; According to the remaining power of the power battery being less than the second threshold value, starting the methanol power booster, controlling the high-temperature fuel cell to preheat, and controlling the low-temperature fuel cell to work.

9. The method of controlling a working machine according to claim 5, characterized by, The construction machinery control method further comprises: In response to the construction machinery being charged, controlling the methanol power booster, the high-temperature fuel cell, and the low-temperature fuel cell to be closed.

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