Compressor power system, work machine, and compressor driving method

Abstract

The present application relates to the technical field of working machine, disclose a compressor power system, working machine and compressor driving method, the compressor power system includes: engine; hydraulic drive component and compressor transmission cooperation; electric drive component and compressor transmission cooperation; controller, respectively with hydraulic drive component and electric drive component connection, the present application when the electric quantity of electric drive component can simultaneously satisfy the power demand of working machine and compressor, drive the compressor through electric drive component, when the electric quantity of electric drive component cannot simultaneously satisfy the power demand of working machine and compressor, at this moment make the electric quantity of electric drive component for supply working machine, and the compressor is driven by hydraulic drive component and works, in guaranteeing that working machine and compressor can be stable under the working condition of demand, as far as possible, use electric drive component to drive the compressor, effectively solve the problem that the single energy supply mode of existing compressor leads to high energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of working machines, in particular to a compressor power system, a working machine and a compressor driving method. BACKGROUND

[0002] In recent years, power batteries not only develop rapidly in the field of passenger cars, but also are more and more widely used in working machines. In order to better apply power batteries in working machines, the working machines will be driven by hybrid power, and the engine and the power battery will be used for energy supply. The air conditioning system is an important load system on the hybrid working machine, and the energy consumption of the air conditioning system can effectively reduce the fuel consumption of the hybrid working machine.

[0003] At present, since the energy density of the power battery cannot completely meet the energy supply demand of the hybrid working machine, if all the loads on the hybrid working machine are supplied by the power battery, the power consumption speed of the power battery will be too fast. Therefore, the power battery only supplies energy to the main working load on the hybrid working machine, and the air conditioning system on the hybrid working machine is usually supplied by the energy output by the engine. However, since the engine in the hybrid working machine is usually far away from the compressor of the air conditioning system, and the parts where the compressor is located often need to be moved, the power output by the engine needs to be transmitted to the compressor through the hydraulic system to drive the compressor to work. The energy utilization efficiency of the compressor in such an air conditioning system is poor, and since the compressor only has the above-mentioned energy supply mode, the single energy supply mode cannot meet the demand of the existing hybrid working machine for improving the energy utilization efficiency. SUMMARY

[0004] Therefore, the present application provides a compressor power system, a working machine and a compressor driving method to solve the problem of high energy consumption caused by the single energy supply mode of the existing compressor.

[0005] In a first aspect, the present application provides a compressor power system applied in a working machine, comprising: an engine; a hydraulic drive component in transmission cooperation with a compressor, the hydraulic drive component being connected with the engine, the hydraulic drive component having a first driving state for driving the compressor to work and a first stopping state for stopping driving the compressor to work; an electric drive component in transmission cooperation with the compressor, the electric drive component being connected with the engine, the electric drive component having a second driving state for driving the compressor to work and a second stopping state for stopping driving the compressor to work; a controller connected with the hydraulic drive component and the electric drive component respectively, the controller being adapted to control the states of the hydraulic drive component and the electric drive component according to the electric quantity of the electric drive component and the power demand value of the compressor; wherein the electric drive component is in the second stopping state when the hydraulic drive component is in the first driving state, and the hydraulic drive component is in the first stopping state when the electric drive component is in the second driving state.

[0006] The hydraulic driving component and the electric driving component are arranged at the output end of the engine, the controller can control the working state of the hydraulic driving component and the electric driving component, the energy loss of the electric driving component when driving the compressor is lower than that of the hydraulic driving component, when the electric quantity of the electric driving component can simultaneously meet the power demand of the working machine and the compressor, the compressor is driven to work through the electric driving component, when the electric quantity of the electric driving component cannot simultaneously meet the power demand of the working machine and the compressor, the electric quantity of the electric driving component is used to supply the working machine to work at this time, and the compressor is driven to work through the hydraulic driving component, while ensuring that the working machine and the compressor can stably work in the demand working condition, the electric driving component is used to drive the compressor as much as possible, thereby effectively reducing the energy loss in the working process of the compressor, and the problem of high energy consumption caused by the single energy supply mode of the existing compressor is effectively solved.

[0007] In an optional implementation, the compressor has a driving shaft, the hydraulic driving component and the electric driving component are respectively in transmission cooperation with the driving shaft, when the hydraulic driving component is in the first driving state, the electric driving component is driven to idle by the driving shaft, and when the electric driving component is in the second driving state, the hydraulic driving component is driven to idle by the driving shaft.

[0008] The energy loss of the hydraulic driving component and the electric driving component in the idle state is small, a clutch structure does not need to be separately arranged for the hydraulic driving component and the electric driving component, and the complexity of the transmission process of the whole system is effectively simplified.

[0009] In an optional implementation, the electric driving component includes a motor and a power battery, the power battery is connected with the motor, an output shaft of the motor is in transmission cooperation with the driving shaft, or the motor shares the driving shaft with the compressor.

[0010] The output shaft of the motor does not need to be connected with the hydraulic system, and is directly cooperated with the driving shaft, thereby effectively reducing the complexity of the electric driving component.

[0011] In an optional implementation, when the output shaft of the motor is in transmission cooperation with the driving shaft, the output shaft of the motor is coaxially connected with the driving shaft, and a transmission structure does not need to be arranged, thereby effectively reducing the number of components and the size of the overall structure.

[0012] In an optional implementation, the hydraulic driving component includes a hydraulic pump, a hydraulic driving part and a transmission assembly, the hydraulic pump is connected with the engine, the hydraulic driving part is communicated with the hydraulic pump, and the hydraulic driving part is cooperated with the driving shaft through the transmission assembly, and the transmission mode is simple and reliable.

[0013] In an alternative embodiment, the transmission assembly comprises a driving gear and a driven gear in engagement, the driving gear is fixed on the transmission shaft of the hydraulic driving member, and the driven gear is fixed on the driving shaft, the gear transmission structure is simple and reliable, and is convenient for processing and manufacturing.

[0014] In a second aspect, the present application further provides a working machine, comprising: a compressor; the compressor power system as described above, the compressor power system being connected with the compressor.

[0015] In a third aspect, the present application further provides a compressor driving control method for controlling the compressor power system as described above, the compressor driving control method comprising the following steps:

[0016] obtaining a current power value of the electric driving component of the compressor power system and a current demand power value of the compressor; and controlling one of the hydraulic driving component and the electric driving component to work according to the current power value and the current demand power value, so as to drive the compressor to work.

[0017] In the case of ensuring that the hybrid working machine and the compressor can be stably used, the electric driving component is used as much as possible to drive the compressor to work, thereby reducing the overall energy loss.

[0018] In an alternative embodiment, the step of controlling one of the hydraulic driving component and the electric driving component to work according to the current power value and the current demand power value comprises:

[0019] determining whether the current power value is less than or equal to a lower limit value of power; determining that the current power value is less than or equal to the lower limit value of power, and controlling the hydraulic driving component to work; and determining that the current power value is greater than the lower limit value of power, and controlling one of the hydraulic driving component and the electric driving component to work according to the current demand power value.

[0020] In an alternative embodiment, the step of determining that the current power value is greater than the lower limit value of power, and controlling one of the hydraulic driving component and the electric driving component to work according to the current demand power value comprises:

[0021] obtaining a preset power value corresponding to the current power value; determining whether the current demand power value is greater than the preset power value; determining that the current demand power value is greater than the preset power value, and controlling the hydraulic driving component to work; and determining that the current demand power value is less than or equal to the preset power value, and controlling the electric driving component to work.

[0022] In an alternative embodiment, the step of obtaining the preset power value corresponding to the current power value comprises:

[0023] If the current power value is determined to be less than or equal to the middle power value, the preset power value is the first power value; if the current power value is determined to be greater than the middle power value, the current power value is determined to be less than or equal to the upper limit power value; if the current power value is determined to be less than or equal to the upper limit power value, the preset power value is the second power value; and if the current power value is determined to be greater than the upper limit power value, the preset power value is the third power value.

[0024] In an optional embodiment, before the step of obtaining the preset power value corresponding to the current power value, the method further comprises:

[0025] determining whether the current power value has been maintained in the corresponding preset power value range for a preset time; if the current power value has been maintained in the corresponding preset power value range for the preset time, obtaining the preset power value corresponding to the current power value; and if the current power value has not been maintained in the corresponding preset power value range for the preset time, re-obtaining the current power value of the power driving component of the compressor power system and the current demand power value of the compressor.

[0026] In an optional embodiment, after the step of determining that the current demand power value is less than or equal to the preset power value, the compressor driving control method further comprises:

[0027] obtaining the current running time of the compressor; determining whether the current running time reaches a preset running time; if the current running time does not reach the preset running time, continuing to obtain the current running time of the compressor; if the current running time reaches the preset running time, and the preset power value is the first power value, determining whether the current power value is less than the lower limit power value; if the current power value is determined to be less than the lower limit power value, controlling the hydraulic driving component to work; and if the current power value is determined to be greater than or equal to the lower limit power value, continuing to determine whether the current power value is less than the lower limit power value.

[0028] if the preset power value is the second power value, determining whether the current power value is less than the middle power value; if the current power value is determined to be less than the middle power value, controlling the hydraulic driving component to work; and if the current power value is determined to be greater than or equal to the middle power value, continuing to determine whether the current power value is less than the middle power value.

[0029] if the preset power value is the third power value, determining whether the current power value is less than the upper limit power value; if the current power value is determined to be less than the upper limit power value, controlling the hydraulic driving component to work; and if the current power value is determined to be greater than or equal to the upper limit power value, continuing to determine whether the current power value is less than the upper limit power value.

[0030] In an optional embodiment, the current demand power value is a current demand rotating speed value of the compressor, and the preset power value is a preset rotating speed value. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0032] Figure 1 A structural schematic diagram of a compressor power system according to an embodiment of the present application;

[0033] Figure 2 A structural schematic diagram of another compressor power system according to an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a compressor power route of a working machine according to an embodiment of the present application;

[0035] Figure 4 A flowchart of a compressor driving method according to an embodiment of the present application;

[0036] Figure 5 A judgment flowchart of a compressor driving method according to an embodiment of the present application.

[0037] Explanation of reference signs:

[0038] 1, compressor; 101, driving shaft; 2, electric motor; 201, output shaft; 202, stator; 203, rotor; 3, hydraulic drive; 301, transmission shaft; 302, driving gear; 303, driven gear. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0040] The following will describe the embodiments of the present application in combination with Figures 1 to 5 .

[0041] According to an embodiment of the present application, in one aspect, a compressor power system applied in a working machine is provided, comprising: an engine, a hydraulic driving component, an electric driving component, and a controller, the hydraulic driving component is in transmission cooperation with the compressor 1, the hydraulic driving component is connected with the engine, the hydraulic driving component has a first driving state for driving the compressor 1 to work and a first stop state for stopping driving the compressor 1 to work; the electric driving component is in transmission cooperation with the compressor 1, the electric driving component is connected with the engine, the electric driving component has a second driving state for driving the compressor 1 to work and a second stop state for stopping driving the compressor 1 to work; the controller is connected with the hydraulic driving component and the electric driving component respectively, the controller is adapted to control the states of the hydraulic driving component and the electric driving component according to the electric quantity of the electric driving component and the power demand value of the compressor; wherein, when the hydraulic driving component is in the first driving state, the electric driving component is in the second stop state, and when the electric driving component is in the second driving state, the hydraulic driving component is in the first stop state.

[0042] The compressor power system of the present embodiment is provided with the hydraulic driving component and the electric driving component at the output end of the engine, and the controller can control the working states of the hydraulic driving component and the electric driving component. Since the energy loss of the electric driving component when driving the compressor 1 is lower than that of the hydraulic driving component, when the electric quantity of the electric driving component can simultaneously meet the power demand of the working machine and the compressor, the compressor 1 is driven to work by the electric driving component; when the electric quantity of the electric driving component cannot simultaneously meet the power demand of the working machine and the compressor, the electric quantity of the electric driving component is used to supply the working machine to work at this time, and the compressor 1 is driven to work by the hydraulic driving component. In this way, the electric driving component is used to drive the compressor 1 as much as possible while ensuring that the working machine and the compressor 1 can stably work under the demand working condition, thereby effectively reducing the energy loss in the working process of the compressor 1, and effectively solving the problem of high energy consumption caused by the single energy supply mode of the existing compressor.

[0043] The energy utilization rate of the electric driving component is higher than that of the hydraulic driving component; the working machine is a hybrid working machine; the power demand value of the compressor can be the current speed demand or power demand of the compressor, which can reflect the current power demand of the compressor; the connection mode of the controller with the hydraulic driving component and the electric driving component can be through wires or signals, so that the controller can effectively control the working states of the hydraulic driving component and the electric driving component.

[0044] Specifically, the hybrid working machine also has a plug-in mode, which can be directly powered by an external power supply at this time, so that the electric driving component can be used to continuously drive the compressor 1 without using the hydraulic driving component, thereby greatly reducing the energy loss.

[0045] Further, since the energy utilization rate of the electric drive component is higher than that of the hydraulic drive component, under the same power demand value of the compressor 1, the energy required for the engine to drive the compressor 1 through the electric drive component is less than the energy required for the engine to drive the compressor 1 through the hydraulic drive component. The compressor power system of the embodiment increases the electric drive mode of the compressor 1, so that the compressor 1 avoids using the hydraulic drive component for driving as much as possible and uses the electric drive component for driving as much as possible when working. Compared with the original compressor 1 system which only drives the hydraulic system through the engine, the energy utilization efficiency is improved.

[0046] In the embodiment, the compressor 1 has a drive shaft 101, and the hydraulic drive component and the electric drive component are respectively in transmission cooperation with the drive shaft 101. When the hydraulic drive component is in the first driving state, the electric drive component is driven by the drive shaft 101 to idle. When the electric drive component is in the second driving state, the hydraulic drive component is driven by the drive shaft 101 to idle. The energy loss of the hydraulic drive component and the electric drive component in the idling state is small, and a clutch structure does not need to be separately provided for the hydraulic drive component and the electric drive component. The complexity of the transmission process of the whole system is effectively simplified, and the compressor power system can be more effectively applied to different hybrid working machines. It can be understood that, as an alternative embodiment, a clutch structure can be provided for the hydraulic drive component and the electric drive component if needed.

[0047] In the embodiment, the electric drive component includes an electric motor 2 and a power battery. The power battery is connected with the electric motor 2. An output shaft 201 of the electric motor 2 is in transmission cooperation with the drive shaft 101, or the electric motor 2 shares the drive shaft 101 with the compressor 1. The output shaft 201 of the electric motor 2 does not need to be connected with the hydraulic system and is directly cooperated with the drive shaft 101. The complexity of the electric drive component is effectively reduced, and the overall structure of the compressor power system is relatively simple, the complexity of the repair process is reduced, and the installation process is simplified.

[0048] Specifically, in the related art, the electric drive component drives an additional hydraulic system through the electric motor 2, and then drives the compressor 1 to work through the hydraulic system. Such power transmission mode has high energy consumption. In the embodiment, the electric drive component does not have a hydraulic system and directly drives the compressor 1 to work through the electric motor 2. The length of the energy transmission route is effectively reduced, and the loss in the energy transmission process is reduced.

[0049] Further, the hybrid working machine also has an energy recovery system, the energy when the working components fall or brake is converted into electric energy by the energy recovery system and stored in the power battery to improve the overall energy utilization efficiency; but when the power of the power battery is high, the power battery cannot store the electric energy recovered by the energy recovery system at this time, which will cause energy waste, and the compressor power system of the embodiment can consume the energy in the compressor 1 as the load of the power battery, so that the energy recovered by the energy recovery system can be fully utilized, further reducing the overall hydraulic energy consumption of the hybrid working machine.

[0050] In the embodiment, when the output shaft 201 of the motor 2 is in transmission cooperation with the driving shaft 101, the output shaft 201 of the motor 2 is coaxially connected with the driving shaft 101, without the need to set a transmission structure, effectively reducing the number of components and the size of the overall structure. The coaxial connection of the output shaft 201 and the driving shaft 101 can effectively reduce the rigid contact when using a transmission part, prolong the service life of the structure, and make the transmission more reliable. It can be understood that as an alternative embodiment, the output shaft 201 of the motor 2 can also be connected with the driving shaft 101 through a transmission part, such as a gear, a belt pulley and the like.

[0051] Specifically, as shown in Figure 1 , the output shaft 201 of the motor 2 is provided at one end at this time, and the output shaft 201 of the motor 2 is coaxially fixed with the driving shaft 101, as shown in Figure 2 , the output shaft 201 of the motor 2 shares an axis with the driving shaft 101, and the rotor 203 of the motor 2 is fixed on the driving shaft 101. When the motor 2 is powered, the driving shaft 101 is rotated by the cooperation of the stator 202 and the rotor 203.

[0052] Further, the electric power driving component further comprises a generator, the generator is connected with the engine, the generator is connected with the power battery, and the engine drives the generator to generate electricity under the optimal working condition.

[0053] In the embodiment, the hydraulic driving component includes a hydraulic pump, a hydraulic driving part 3 and a transmission assembly. The hydraulic pump is connected with the engine, the hydraulic driving part 3 is communicated with the hydraulic pump, and the hydraulic driving part 3 is cooperated with the driving shaft 101 through the transmission assembly. The transmission mode is simple and reliable.

[0054] Specifically, the hydraulic driving component can refer to the existing hydraulic driving system of the compressor 1 of the hybrid working machine, which will not be described in detail here.

[0055] In this embodiment, the transmission component includes a meshing drive gear 302 and a driven gear 303. The drive gear 302 is fixed on the transmission shaft 301 of the hydraulic drive component 3, and the driven gear 303 is fixed on the drive shaft 101, so that the hydraulic drive component can reliably cooperate with the transmission shaft 301. The gear transmission structure is simple and reliable and easy to process and manufacture.

[0056] According to an embodiment of the present invention, in another aspect, a working machine is provided, comprising: a compressor 1 and the above-described compressor power system, wherein the compressor power system is connected to the compressor.

[0057] In this embodiment, the operating machinery is an excavator, crane, rotary drilling rig, etc., equipped with a power battery power supply system.

[0058] Preferably, the operating machinery is a hybrid crane, which includes a rotatable upper structure and a lower structure that carries the upper structure. The upper structure has a small internal space, and the engine is generally located on the lower structure to provide power for the upper structure's operation. An air conditioning system is required in the cab of the upper structure. Since the upper structure of the hybrid crane needs to rotate via a turntable, the compressor of the upper structure's air conditioning system cannot be directly driven by the engine. In hybrid cranes in related technologies, the engine located on the lower structure must use a hydraulic system to drive the compressor, transmitting the engine's power through hydraulic pipelines. However, due to the significant power loss during transmission in the hydraulic system, the use of only one power transmission route in the hydraulic system results in high system energy consumption for the compressor.

[0059] The hybrid crane in this embodiment uses the aforementioned compressor power system, which can effectively combine the power battery's charge level with the compressor's power requirements. When the power battery can simultaneously meet the working requirements of the hybrid crane and the compressor's usage requirements, it uses electric drive; when it cannot meet the working requirements of the hybrid crane or the compressor's usage requirements, it uses hydraulic drive. This ensures that the hybrid crane can work reliably while using electric drive to operate the compressor as much as possible, thereby effectively reducing the hybrid crane's fuel consumption.

[0060] Specifically, such as Figure 3 As shown, this is the power transmission route of compressor 1 on the hybrid crane. Hydraulic drive route: The engine transmits power to the hydraulic pump through the transfer case. The hydraulic pump drives the hydraulic oil and drives the hydraulic drive component 3 to rotate. The hydraulic drive component 3 drives the drive shaft 101 to rotate through the transmission shaft 301, thereby driving compressor 1 to work. Electric drive route: There are three energy sources for the power battery: charging through the generator driven by the engine, charging through an external power source, and charging through an energy recovery system. The power battery directly drives the drive shaft 101 to rotate through the electric motor, thereby driving compressor 1 to work.

[0061] According to an embodiment of the present invention, in another aspect, a compressor drive control method is provided for controlling the above-mentioned compressor power system. The compressor drive control method includes the following steps:

[0062] Obtain the current electrical charge value of the electric drive component of the compressor power system and the current power demand value of compressor 1; control one of the hydraulic drive component and the electric drive component to operate based on the current electrical charge value and the current power demand value, so as to drive compressor 1 to work.

[0063] When the electrical power of the electric drive component is sufficient to meet the operating needs of both the hybrid machinery and the compressor 1, the electric drive component is used to drive the compressor 1. When the electrical power of the electric drive component is insufficient, the hydraulic drive component is used to drive the compressor 1. To ensure that both the hybrid machinery and the compressor 1 can operate stably, the electric drive component should be used as much as possible to drive the compressor 1, thereby reducing overall energy consumption.

[0064] In this embodiment, the step of controlling the operation of one of the hydraulic drive component and the electric drive component based on the current power level and the current power demand includes:

[0065] Determine if the current battery level is less than or equal to the lower limit; if the current battery level is less than or equal to the lower limit, control the hydraulic drive component to operate; if the current battery level is greater than the lower limit, control one of the hydraulic drive component and the electric drive component to operate based on the current power demand.

[0066] Specifically, such as Figure 5 As shown in the figure, A is the lower limit of the power consumption. A is specifically set by adding a coefficient to maintain the lower limit of the power consumption of the hybrid operating machinery. When the current power consumption is less than A, it means that the current power consumption can only support the operation of the hybrid operating machinery. Therefore, there is no need to consider the current power demand of compressor 1. The compressor 1 can be driven directly by the hydraulic drive component, reducing the judgment process.

[0067] In this embodiment, the step of determining that the current power level is greater than the lower limit of the power level, and controlling the operation of one of the hydraulic drive component and the electric drive component according to the current power demand value includes:

[0068] Obtain the preset power value corresponding to the current power level; determine whether the current power demand is greater than the preset power value; if the current power demand is greater than the preset power value, control the hydraulic drive component to work; if the current power demand is less than or equal to the preset power value, control the electric drive component to work.

[0069] Specifically, the power of the power battery is continuously changing, and therefore the numerical value of the current power value is also changing. Since the power value of the compressor 1 that can be met by the power battery with different power is limited, in order to effectively determine whether the compressor 1 is driven by the power driving component under the current power value, it is necessary to obtain the preset power value corresponding to the current power value and the current required power value of the compressor 1, and compare the two to determine whether to use the power driving component to drive. The logic is clear and the determination process is reasonable. It should be noted that the preset power value herein is the limit value of the power value of the compressor 1 that can be met by the power battery under the current power value.

[0070] In the embodiment, the step of obtaining the preset power value corresponding to the current power value comprises:

[0071] It is determined that the current power value is less than or equal to the power intermediate value, and the preset power value is the first power value; it is determined that the current power value is greater than the power intermediate value, and it is determined that the current power value is less than or equal to the power upper limit value; it is determined that the current power value is less than or equal to the power upper limit value, and the preset power value is the second power value; it is determined that the current power value is greater than the power upper limit value, and the preset power value is the third power value. The first power value, the second power value, and the third power value increase in turn.

[0072] Specifically, the different preset power values corresponding to different current power values are explained as follows: Figure 4 As shown in the figure, B is the power intermediate value, C is the power upper limit value, n1 is the first power value, n2 is the second power value, and n3 is the third power value. In order to prevent the preset power value from changing with the current power value, and to prevent the comparison between the current required power value and the constantly changing current power value from changing the determination result and causing the driving mode of the compressor 1 to change frequently, the power value of the power battery is divided into multiple intervals, and the current power value corresponds to different power values in different intervals. At present, the power value of the power battery is divided into four regions, which can basically meet the use requirements, i.e., less than A, greater than A and less than B, greater than B and less than C, and greater than C. If there is a demand, more regions can be divided, such as greater than C and less than D, greater than D and less than E, etc. Alternatively, a preset power value can be corresponded to each power value for continuous determination to achieve stepless adjustment.

[0073] It should be noted that the power intermediate value and the power upper limit value herein do not strictly refer to the power battery being at half power and the power battery being at full power. The power intermediate value and the power upper limit value herein are only the endpoint values of the power value region division, and the specific numerical value is not strictly limited and can be selected according to actual use requirements.

[0074] In the embodiment, before the step of obtaining the preset power value corresponding to the current power value, the method further comprises:

[0075] determining whether the current power value is maintained in the corresponding preset power value range for a preset time; determining that the current power value is maintained in the corresponding preset power value range for the preset time, obtaining the preset power value corresponding to the current power value; determining that the current power value is not maintained in the corresponding preset power value range for the preset time, re-obtaining the current power value of the power driving component of the compressor power system and the current demand power value of the compressor 1.

[0076] Specifically, after the judgment of the power interval where the current power value is located is completed, it is also necessary to ensure that the current power value is in the current power interval within a certain time, to prevent the current power value from approaching the intersection of two intervals and changing the power interval within a certain time, to avoid the current power value from frequently changing the power interval and frequently changing the driving mode, and to make the compressor 1 frequently start and stop.

[0077] In the embodiment, after the step of determining that the current demand power value is less than or equal to the preset power value and controlling the power driving component to work, the compressor driving control method further comprises:

[0078] obtaining the current running time of the compressor; determining whether the current running time reaches the preset running time; determining that the current running time does not reach the preset running time, continuing to obtain the current running time of the compressor;

[0079] determining that the current running time reaches the preset running time, the preset power value is the first power value, determining that the current power value is less than the lower limit of power, controlling the hydraulic driving component to work when it is determined that the current power value is less than the lower limit of power, and continuing to determine that the current power value is less than the lower limit of power when it is determined that the current power value is greater than or equal to the lower limit of power.

[0080] the preset power value is the second power value, determining that the current power value is less than the middle value of power, controlling the hydraulic driving component to work when it is determined that the current power value is less than the middle value of power, and continuing to determine that the current power value is less than the middle value of power when it is determined that the current power value is greater than or equal to the middle value of power.

[0081] the preset power value is the third power value, determining that the current power value is less than the upper limit of power, controlling the hydraulic driving component to work when it is determined that the current power value is less than the upper limit of power, and continuing to determine that the current power value is less than the upper limit of power when it is determined that the current power value is greater than or equal to the upper limit of power.

[0082] Specifically, if the current power value of the power battery is in a certain power interval, and the demand power value of the compressor 1 is less than the preset power value of the current power interval, at this time the compressor 1 is driven to work by the electric driving component, but when the compressor 1 still maintains the current demand power value, and the current power value of the power battery suddenly enters a power interval smaller than the previous power interval, for example, the original current power value is in the B to C interval, and the current power value continuously decreases until it is less than B, and enters the A to B interval, since the first power value in the A to B interval is less than the second power value in the B to C interval, the demand power value of the compressor 1 at this time must be greater than the first power value, so the hydraulic driving component is quickly switched to drive the compressor 1 to work, thereby ensuring that the power can be continuously and reliably supplied.

[0083] In the embodiment, the current demand power value is the current demand speed value of the compressor 1, and the preset power value is the preset speed value. The speed value can more directly reflect the power value of the compressor 1.

[0084] The compressor driving control method of the embodiment will be specifically described below.

[0085] When 0 < current power value ≤ A, the hydraulic driving mode is adopted;

[0086] When A < current power value ≤ B, if the demand speed value of the compressor 1 > n1, the hydraulic driving mode is adopted, and if the demand speed value of the compressor ≤ n1, the electric driving mode is adopted;

[0087] When B < current power value ≤ C, if the demand speed value of the compressor 1 > n2, the hydraulic driving mode is adopted, and if the demand speed value of the compressor 1 ≤ n2, the electric driving mode is adopted;

[0088] When C < current power value, if the demand speed value of the compressor 1 > n3, the hydraulic driving mode is adopted, and if the demand speed value of the compressor 1 ≤ n3, the electric driving mode is adopted;

[0089] When the current power value is less than or equal to A, the hydraulic driving mode is adopted, and the hydraulic driving component is used to drive the compressor 1 to rotate;

[0090] When the current power value is greater than A and less than or equal to B, and after a preset time, if the demand speed value is greater than n1, the hydraulic driving mode is adopted, and the hydraulic driving component is used to drive the compressor 1 to rotate, and if the demand speed value is less than or equal to n1, the driving mode of the compressor 1 is switched to the electric driving mode, and the electric driving component is used to drive the compressor 1 to rotate. After the compressor 1 runs for a period of time, if the current power value decreases to less than A, the driving mode of the compressor 1 is switched to the hydraulic driving mode, and the hydraulic driving component is used to drive the compressor 1 to rotate;

[0091] When the current power value is greater than B and less than or equal to C and lasts for a preset time, if the demand rotating speed value is greater than n2, the hydraulic drive mode is adopted to drive the compressor 1 to rotate by using the hydraulic drive component, and if the demand rotating speed value is less than or equal to n2, the drive mode of the compressor 1 is switched to the electric drive mode to drive the compressor 1 to rotate by using the electric drive component. When the current power value decreases to less than B after the compressor 1 operates for a period of time, the drive mode of the compressor 1 is switched to the hydraulic drive mode to drive the compressor 1 to rotate by using the hydraulic drive component;

[0092] When the current power value is greater than C and lasts for a preset time, if the demand rotating speed value is greater than n3, the hydraulic drive mode is adopted to drive the compressor 1 to rotate by using the hydraulic drive component, and if the demand rotating speed value is less than or equal to n3, the drive mode of the compressor 1 is switched to the electric drive mode to drive the compressor 1 to rotate by using the electric drive component. When the current power value decreases to less than C after the compressor 1 operates for a period of time, the drive mode of the compressor 1 is switched to the hydraulic drive mode to drive the compressor 1 to rotate by using the hydraulic drive component;

[0093] The drive mode switching of the compressor 1 is determined according to the energy control strategy of the whole vehicle, and the current power value and the demand rotating speed value of the compressor 1 are combined to realize the switching of the drive mode of the compressor 1, wherein 0

[0094] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A compressor drive control method for controlling the compressor power system of a working machine, characterized in that, The compressor power system includes: engine; A hydraulic drive component is driven in conjunction with the compressor (1). The hydraulic drive component is connected to the engine. The hydraulic drive component has a first driving state that drives the compressor (1) to work and a first stopping state that stops driving the compressor (1) to work. An electric drive component is driven in conjunction with the compressor (1). The electric drive component is connected to the engine. The electric drive component has a second drive state that drives the compressor (1) to work and a second stop state that stops driving the compressor (1) to work. The electric drive component is also used to drive the working machinery to perform operations. A controller is connected to the hydraulic drive component and the electric drive component respectively, and the controller is adapted to control the state of the hydraulic drive component and the electric drive component according to the power of the electric drive component and the power demand of the compressor; Wherein, when the hydraulic drive component is in the first drive state, the electric drive component is in the second stop state, and when the electric drive component is in the second drive state, the hydraulic drive component is in the first stop state; When the current power value of the electric drive component is greater than the lower limit of the power value, the preset power value corresponding to the current power value is compared with the current required power value. If the current required power value is greater than the preset power value, the hydraulic drive component is controlled to work. If the current required power value is less than or equal to the preset power value, the electric drive component is controlled to work. The compressor drive control method includes the following steps: Obtain the current power value of the electric drive components of the compressor power system and the current power demand value of the compressor (1); Determine whether the current battery level is less than or equal to the lower battery limit. If the current battery level is determined to be less than or equal to the lower battery level, then the hydraulic drive component is controlled to operate. If the current power level is determined to be greater than the lower limit of the power level, then control one of the hydraulic drive component and the electric drive component to operate based on the current power demand value. The step of determining that the current power level is greater than the lower limit of the power level, and controlling one of the hydraulic drive component and the electric drive component to operate based on the current power demand value includes: Determine whether the current required power value is greater than the preset power value; If the current required power value is determined to be greater than the preset power value, then the hydraulic drive component is controlled to operate; If the current required power value is determined to be less than or equal to the preset power value, then the electric drive component is controlled to operate.

2. The compressor drive control method according to claim 1, characterized in that, The compressor (1) has a drive shaft (101). The hydraulic drive component and the electric drive component are respectively driven by the drive shaft (101). When the hydraulic drive component is in the first driving state, the electric drive component is driven to rotate idling by the drive shaft (101). When the electric drive component is in the second driving state, the hydraulic drive component is driven to rotate idling by the drive shaft (101).

3. The compressor drive control method according to claim 2, characterized in that, The electric drive component includes an electric motor (2) and a power battery. The power battery is connected to the electric motor (2). The output shaft (201) of the electric motor (2) is driven by the drive shaft (101). Alternatively, the electric motor (2) and the compressor (1) share the drive shaft (101).

4. The compressor drive control method according to claim 3, characterized in that, When the output shaft (201) of the motor (2) is engaged with the drive shaft (101), the output shaft (201) of the motor (2) is coaxially connected with the drive shaft (101).

5. The compressor drive control method according to claim 2, characterized in that, The hydraulic drive component includes a hydraulic pump, a hydraulic drive element (3), and a transmission assembly. The hydraulic pump is connected to the engine, the hydraulic drive element (3) is connected to the hydraulic pump, and the hydraulic drive element (3) is engaged with the drive shaft (101) through the transmission assembly.

6. The compressor drive control method according to claim 5, characterized in that, The transmission assembly includes a meshing drive gear (302) and a driven gear (303). The drive gear (302) is fixed on the transmission shaft (301) of the hydraulic drive (3), and the driven gear (303) is fixed on the drive shaft (101).

7. The compressor drive control method according to any one of claims 1 to 6, characterized in that, The operating machinery also includes: Compressor (1), the compressor power system is connected to the compressor.

8. The compressor drive control method according to claim 1, characterized in that, The steps for obtaining the preset power value corresponding to the current power value include: Determine if the current battery level is less than or equal to the median battery level. If the current battery level is determined to be less than or equal to the intermediate battery level, then the preset power value is the first power value; Determine that the current battery level is greater than the battery midpoint, and then determine that the current battery level is less than or equal to the battery upper limit. If the current battery level is determined to be less than or equal to the upper limit of the battery level, then the preset power value is the second power value; If the current battery level is determined to be greater than the upper limit of the battery level, then the preset power value is the third power value.

9. The compressor drive control method according to claim 1, characterized in that, Before the step of obtaining the preset power value corresponding to the current power value, the following is also included: Determine whether the current battery level has remained within the corresponding preset battery level range for a preset time; If it is determined that the current battery level has been maintained within the corresponding preset battery level range for a preset time, then the preset power value corresponding to the current battery level is obtained; If it is determined that the current power value has not been maintained within the corresponding preset power value range for a preset time, then the current power value of the electric drive component of the compressor power system and the current power demand value of the compressor (1) are reacquired.

10. The compressor drive control method according to claim 8, characterized in that, After determining that the current required power value is less than or equal to the preset power value, and then controlling the operation of the electric drive component, the compressor drive control method further includes: Obtain the current running time of the compressor; Determine whether the current running time has reached the preset running time; If it is determined that the current running time has not reached the preset running time, then the current running time of the compressor will continue to be acquired. When the current running time reaches the preset running time, When the preset power value is the first power value, it is determined that the current power value is less than the lower limit of the power value. If it is determined that the current power value is less than the lower limit of the power value, the hydraulic drive component is controlled to work. If it is determined that the current power value is greater than or equal to the lower limit of the power value, it is determined that the current power value is less than the lower limit of the power value. When the preset power value is the second power value, it is determined that the current power value is less than the power midpoint value. If the current power value is determined to be less than the power midpoint value, the hydraulic drive component is controlled to work. If the current power value is determined to be greater than or equal to the power midpoint value, it is determined that the current power value is less than the power midpoint value. When the preset power value is the third power value, it is determined that the current power value is less than the upper limit of the power value. If the current power value is determined to be less than the upper limit of the power value, the hydraulic drive component is controlled to work. If the current power value is determined to be greater than or equal to the upper limit of the power value, it is determined that the current power value is less than the upper limit of the power value.

11. The compressor drive control method according to any one of claims 8 to 10, characterized in that, The current required power value is the current required speed value of the compressor (1), and the preset power value is the preset speed value.

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