Hybrid system and control method

Abstract

The present disclosure relates to a hybrid system and a control method, the hybrid system comprising: an electric machine (2) operatively connected to a work load of a working machine vehicle, having an electric motor mode and a generator mode; a four-quadrant pump (3) operatively connected to the work load of the working machine vehicle (1), having a pump mode and a motor mode; an energy storage device connected to the four-quadrant pump (3), having an energy storage mode and an energy release mode; a first detection device for detecting an operating state of the work load; a second detection device for detecting an energy storage reserve of the energy storage device; and a processor signal connected to the electric machine (2), the four-quadrant pump (3), the energy storage device, the first detection device and the second detection device, configured to switch the operating mode of the electric machine (2), the four-quadrant pump (3) and / or the energy storage device according to at least one of the operating state of the work load, the operating current of the electric machine (2) and the energy storage reserve of the energy storage device.

Description

Technical Field

[0001] This disclosure relates to the field of engineering machinery, and in particular to a hybrid power system and a control method for a hybrid power system. Background Technology

[0002] Most engineering machinery products, such as wheeled or crawler cranes, include winch and slewing systems. The market primarily uses hydraulic drive, where an internal combustion engine drives a hydraulic pump unit, which in turn supplies hydraulic energy to a hydraulic motor to drive the slewing and winch mechanisms, achieving slewing and lifting / lowering actions respectively. However, due to the minimum stable speed of the hydraulic motor, its driving torque is very high, but its heavy-load micro-motion capability is low. Furthermore, using an internal combustion engine as a power source generates exhaust emissions that pollute the environment.

[0003] Most overhead cranes or winches used in factories are electrically driven, using motors and mechanical transmission devices to drive the winch mechanism to achieve lifting and lowering of loads. The system principle is simple and the micro-motion control of the load is highly accurate, but the weight and size of the mechanical device are large, which makes it difficult to apply in mobile machinery products.

[0004] Some related technologies apply hybrid power products to engineering machinery vehicles, but the devices are complex, have many hardware configurations and high costs, and have low energy conversion efficiency, resulting in low actual energy saving. Summary of the Invention

[0005] In view of this, the present disclosure provides a hybrid power system and a hybrid power control method, which can optimize system performance.

[0006] In one aspect of this disclosure, a hybrid power system is provided for powering an engineering machinery vehicle, comprising:

[0007] The electric motor is operably connected to the working load of the construction machinery vehicle and has both electric motor and generator modes.

[0008] The four-quadrant pump is operablely connected to the operating load of construction machinery vehicles, and has both pump and motor operating modes.

[0009] The energy storage device is connected to a four-quadrant pump and has both energy storage and energy release modes.

[0010] The first detection device is used to detect the operating status of the workload;

[0011] A second detection device is used to detect the energy storage reserve of the energy storage device; and

[0012] The processor, which is signal-connected to the motor, the four-quadrant pump, the energy storage device, the first detection device, and the second detection device, is configured to switch the operating conditions of the motor, the four-quadrant pump, and / or the energy storage device based on at least one of the operating status of the work load, the operating current of the motor, and the energy storage reserve of the energy storage device.

[0013] In some embodiments, the processor is further configured to switch the operating conditions of the motor according to the operating state of the workload.

[0014] In some embodiments, the construction machinery vehicle has a forward rotation start-up condition, and the motor is configured to provide electrical energy to the construction machinery vehicle in the electric motor condition;

[0015] The processor is further configured to enable the motor to operate in electric motor mode during the forward rotation start-up of the construction machinery vehicle.

[0016] In some embodiments, the processor is further configured to switch the operating conditions of the motor, the four-quadrant pump, and the energy storage device according to the operating status of the workload, the operating current of the motor, and the energy storage reserve of the energy storage device.

[0017] In some embodiments, the four-quadrant pump is configured to provide hydraulic energy to the construction machinery vehicle under motor operating conditions, and the energy storage device is configured to provide hydraulic energy to the four-quadrant pump under energy release conditions.

[0018] The processor is further configured to: when the construction machinery vehicle is in the forward rotation starting condition, and the motor's operating current is greater than or equal to a preset current and the energy storage capacity of the energy storage device is greater than or equal to a first preset amount, make the four-quadrant pump operate in motor condition and make the energy storage device operate in energy release condition.

[0019] In some embodiments, the processor is further configured to switch the operating conditions of the four-quadrant pump and the energy storage device according to the operating status of the workload.

[0020] In some embodiments, it also includes:

[0021] A brake, operably connected to the working load of a construction machinery vehicle, for braking the construction machinery vehicle;

[0022] Among them, the construction machinery vehicle also has a forward rotation and stop working condition. The four-quadrant pump is configured to convert the mechanical energy provided by the construction machinery vehicle into hydraulic energy in the pump working condition and provide hydraulic energy to the energy storage device. The energy storage device is configured to store the hydraulic energy provided by the four-quadrant pump in the energy storage working condition.

[0023] The processor is further configured to: enable the four-quadrant pump to operate in pump mode and enable the energy storage device to operate in energy storage mode when the engineering machinery vehicle is rotating forward and stopped.

[0024] In some embodiments, the construction machinery vehicle also has a reverse start condition, and the four-quadrant pump is configured to convert the mechanical energy provided by the construction machinery vehicle into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device, which is configured to store the hydraulic energy provided by the four-quadrant pump in the energy storage condition.

[0025] The processor is further configured to: enable the four-quadrant pump to operate in pump mode and the energy storage device to operate in energy storage mode during the reverse start-up of the construction machinery vehicle.

[0026] In some embodiments, the processor is further configured to switch the operating conditions of the motor according to the operating status of the workload and the energy storage capacity of the energy storage device.

[0027] In some embodiments, the motor is configured to convert the mechanical energy provided by the construction machinery vehicle into electrical energy in generator operation and to store the electrical energy.

[0028] The processor is further configured to: when the energy storage capacity of the energy storage device is greater than or equal to the second preset amount during the reverse start-up of the construction machinery vehicle, make the motor operate in generator mode.

[0029] In some embodiments, it also includes:

[0030] A brake, operably connected to the working load of a construction machinery vehicle, for braking the construction machinery vehicle;

[0031] Among them, the construction machinery vehicle also has a reverse stop working condition. The four-quadrant pump is configured to convert the mechanical energy provided by the construction machinery vehicle into hydraulic energy in the pump working condition and provide hydraulic energy to the energy storage device. The energy storage device is configured to store the hydraulic energy provided by the four-quadrant pump in the energy storage working condition.

[0032] The processor is further configured to: operate the four-quadrant pump in pump mode and the energy storage device in energy storage mode when the construction machinery vehicle reverses and stops.

[0033] In some embodiments, the four-quadrant pump includes:

[0034] Pump body;

[0035] The variable component, connected to the pump body, can drive the pump body to rotate in order to adjust the pump body's variables;

[0036] The hybrid power system also includes:

[0037] The first valve is located in the oil circuit between the energy storage device and the variable component;

[0038] The third detection device is configured to detect the variable angle of the pump body;

[0039] The processor is connected to the third detection device and the first valve and is configured to adjust the displacement of the variable component through the first valve so that the four-quadrant pump operates in pump mode or motor mode.

[0040] In some embodiments, the energy storage device includes:

[0041] First accumulator;

[0042] The hybrid power system also includes:

[0043] The second valve is located in the oil circuit between the first accumulator and the four-quadrant pump. The second valve has two working positions. When the second valve is in the first working position, the oil circuit between the first accumulator and the four-quadrant pump is unidirectionally open from the four-quadrant pump to the first accumulator. When the second valve is in the second working position, the oil circuit between the first accumulator and the four-quadrant pump is bidirectionally open.

[0044] The processor is connected to the second valve signal and is configured to adjust the working position of the second valve so that the first energy accumulator operates in either energy storage or energy release mode.

[0045] In some embodiments, the energy storage device further includes:

[0046] The second accumulator is connected to the four-quadrant pump. The maximum energy storage pressure of the second accumulator is less than that of the first accumulator.

[0047] The hybrid power system also includes:

[0048] The third valve, located in the oil line between the first accumulator and the second accumulator, is configured to allow unidirectional flow from the second accumulator to the first accumulator.

[0049] In some embodiments, it also includes:

[0050] The pilot pressure oil source is connected to the variable displacement component of the four-quadrant pump.

[0051] In some embodiments, it also includes:

[0052] The pilot pressure oil source is connected to the brake.

[0053] The fourth valve is located in the oil circuit between the pilot pressure oil source and the brake.

[0054] The processor is connected to the fourth valve signal and is configured to switch the oil circuit between the pilot pressure oil source and the brake through the fourth valve so as to stop or start the construction machinery vehicle.

[0055] In another aspect of this disclosure, a hybrid power system control method is provided for any of the hybrid power systems described above, comprising:

[0056] The first detection device obtains the operating status of the work load, the second detection device obtains the energy storage capacity of the energy storage device, and the motor operating current.

[0057] Based on at least one of the following: the operating status of the workload, the operating current of the motor, and the energy storage capacity of the energy storage device, switch the operating conditions of the motor, the four-quadrant pump, and / or the energy storage device.

[0058] In some embodiments, the operation of switching the operating conditions of the motor, four-quadrant pump, and / or energy storage device based on at least one of the operating state of the workload, the operating current of the motor, and the energy storage reserve of the energy storage device specifically includes:

[0059] Switch the motor's operating conditions according to the operating status of the workload.

[0060] In some embodiments, the construction machinery vehicle has a forward rotation start-up condition, and the motor is configured to provide electrical energy to the construction machinery vehicle in the electric motor condition;

[0061] Specifically, the operation of switching the motor's operating conditions based on the working load includes:

[0062] When the construction machinery vehicle is starting in the forward rotation mode, the motor is operated in motor mode.

[0063] In some embodiments, the operation of switching the operating conditions of the motor, four-quadrant pump, and / or energy storage device based on at least one of the operating state of the workload, the operating current of the motor, and the energy storage reserve of the energy storage device specifically includes:

[0064] Based on the operating status of the workload, the operating current of the motor, and the energy storage capacity of the energy storage device, switch the operating conditions of the motor, four-quadrant pump, and energy storage device.

[0065] In some embodiments, the four-quadrant pump is configured to provide hydraulic energy to the construction machinery vehicle under motor operating conditions, and the energy storage device is configured to provide hydraulic energy to the four-quadrant pump under energy release conditions.

[0066] Specifically, the operation of switching the operating conditions of the motor, four-quadrant pump, and energy storage device according to the operating status of the workload, the operating current of the motor, and the energy storage reserve of the energy storage device includes:

[0067] When the construction machinery vehicle is in forward rotation starting condition, and the motor's operating current is greater than or equal to the preset current and the energy storage capacity of the energy storage device is greater than or equal to the first preset amount, the motor is operated in motor condition, the four-quadrant pump is operated in motor condition, and the energy storage device is operated in energy release condition.

[0068] In some embodiments, the operation of switching the operating conditions of the motor, four-quadrant pump, and / or energy storage device based on at least one of the operating state of the workload, the operating current of the motor, and the energy storage reserve of the energy storage device specifically includes:

[0069] The operating conditions of the four-quadrant pump and the energy storage device are switched according to the operating status of the workload.

[0070] In some embodiments, the hybrid power system further includes a brake operably connected to the working load of the construction machinery vehicle for braking the construction machinery vehicle; the construction machinery vehicle also has a forward rotation stop condition, and the four-quadrant pump is configured to convert the mechanical energy provided by the construction machinery vehicle into hydraulic energy in the pump condition and provide hydraulic energy to an energy storage device, which is configured to store the hydraulic energy provided by the four-quadrant pump in the energy storage condition.

[0071] Specifically, the operation of switching the operating conditions of the four-quadrant pump and the energy storage device according to the operating status of the workload includes:

[0072] When the construction machinery vehicle is in forward rotation and stopped, the four-quadrant pump is operated in pump mode, and the energy storage device is operated in energy storage mode.

[0073] In some embodiments, the construction machinery vehicle also has a reverse start condition, and the four-quadrant pump is configured to convert the mechanical energy provided by the construction machinery vehicle into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device, which is configured to store the hydraulic energy provided by the four-quadrant pump in the energy storage condition.

[0074] Specifically, the operation of switching the operating conditions of the four-quadrant pump and the energy storage device according to the operating status of the workload includes:

[0075] In the reverse start-up condition of construction machinery vehicles, the four-quadrant pump is operated in pump mode, and the energy storage device is operated in energy storage mode.

[0076] In some embodiments, the operation of switching the operating conditions of the motor, four-quadrant pump, and / or energy storage device based on at least one of the operating state of the workload, the operating current of the motor, and the energy storage reserve of the energy storage device specifically includes:

[0077] The operating conditions of the motor are switched according to the operating status of the workload and the energy storage capacity of the energy storage device.

[0078] In some embodiments, the motor is configured to convert the mechanical energy provided by the construction machinery vehicle into electrical energy in generator operation and to store the electrical energy.

[0079] Specifically, the operation of switching the motor's operating conditions based on the working load's operating status and the energy storage capacity of the energy storage device includes:

[0080] When the reverse start-up condition of the construction machinery vehicle is such that the energy storage reserve of the energy storage device is greater than or equal to the second preset amount, the motor operates in generator mode.

[0081] In some embodiments, the hybrid power system further includes: a brake operably connected to the working load of the construction machinery vehicle for braking the construction machinery vehicle; the construction machinery vehicle also has a reverse stop condition, and the four-quadrant pump is configured to convert the mechanical energy provided by the construction machinery vehicle into hydraulic energy in the pump condition and provide hydraulic energy to an energy storage device, the energy storage device being configured to store the hydraulic energy provided by the four-quadrant pump in the energy storage condition.

[0082] Specifically, the operation of switching the operating conditions of the four-quadrant pump and the energy storage device according to the operating status of the workload includes:

[0083] When the construction machinery vehicle reverses and stops, the four-quadrant pump is operated in pump mode, and the energy storage device is operated in energy storage mode.

[0084] Therefore, according to the embodiments of this disclosure, by setting a four-quadrant pump and a motor to be operably connected to the construction machinery vehicle, and by switching the operating conditions of the motor, the four-quadrant pump and / or the energy storage device according to at least one of the operating state of the working load, the operating current of the motor and the energy storage reserve of the energy storage device, the working load of the construction machinery vehicle can be driven by a combination of hydraulic energy and electrical energy, thereby improving the smoothness of micro-motion control under heavy-load conditions such as slewing and hoisting, as well as the energy utilization rate during the hoisting process, and reducing the energy loss of the system. Attached Figure Description

[0085] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0086] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0087] Figure 1 This is a connection diagram based on some embodiments of the hybrid power system disclosed herein;

[0088] Figure 2 This is a connection diagram according to other embodiments of the hybrid power system of this disclosure;

[0089] Figure 3 This is a flowchart of some embodiments of the hybrid power system control method according to the present disclosure.

[0090] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0091] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0092] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0093] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0094] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0095] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0096] Some related technologies employ hydraulic drive, where an internal combustion engine drives a hydraulic pump unit to supply hydraulic energy to a hydraulic motor, which in turn drives the slewing and hoisting mechanisms to achieve slewing and lifting / lowering actions, respectively. However, the system is affected by the minimum stable speed of the hydraulic motor, resulting in a large driving torque but low micro-motion capability under heavy loads. Using an internal combustion engine as a power source also produces exhaust emissions that pollute the environment. Electric drive is unsuitable for heavy and large construction machinery vehicles. Other related technologies utilize hybrid power systems in construction machinery vehicles, but these systems are complex, require numerous hardware components, are costly, have low energy conversion efficiency, poor actual energy saving, and low system reliability.

[0097] In view of this, in one aspect of the present disclosure, a hybrid power system is provided for powering an engineering machinery vehicle 1, which can optimize system performance. Figure 1 This is a connection diagram based on some embodiments of the hybrid power system disclosed herein. Figure 2 This is a connection diagram according to other embodiments of the hybrid power system disclosed herein, with reference to... Figure 1 and Figure 2 The hybrid power system includes: motor 2, four-quadrant pump 3, energy storage device 4, first detection device 51, second detection device 52 and processor 6.

[0098] Construction machinery vehicles include, but are not limited to, wheeled or crawler cranes, truck-mounted cranes, etc., and can also be used for hydraulic tower cranes, equipped with hoisting and slewing systems. Motor 2 is operably connected to the working load of construction machinery vehicle 1, and has both motor and generator modes. In motor mode, it provides power output to the working load of construction machinery vehicle 1, enabling the construction machinery vehicle 1 to perform slewing or hoisting actions. In generator mode, it can recover mechanical energy, converting mechanical energy into electrical energy for storage.

[0099] The four-quadrant pump 3 divides its working area into four quadrants according to the rotation direction (forward or reverse) and variable range (positive or negative swing angle changes causing displacement to vary from -1 to 1). This pump or motor can rotate in both directions and its displacement can vary positively and negatively. The four-quadrant pump 3 is operably connected to the working load of the construction machinery vehicle 1, and has both pump and motor operating modes. In pump mode, it acts as an auxiliary drive element for the motor 2, providing hydraulic energy to the construction machinery vehicle 1. In motor mode, it recovers mechanical energy and converts it into hydraulic energy for storage in the energy storage device 4. A clutch can also be connected in series between the four-quadrant pump 3 and the motor 2 to connect or disconnect the hydraulic drive device.

[0100] The energy storage device 4 is connected to the four-quadrant pump 3 and has energy storage and energy release modes. In the energy release mode, it provides hydraulic energy to the four-quadrant pump 3, enabling the four-quadrant pump 3 to work in the pump mode. In the energy storage mode, it can store externally input energy.

[0101] The first detection device 51 is used to detect the operating status of the work load. A speed reducer 1 can be installed between the construction machinery vehicle 1 and the motor 1. The first detection device 51 includes, but is not limited to, a speed sensor installed at the output end of the speed reducer 1 to detect the rotation direction and speed of the output end. The operating status of the work load includes, but is not limited to, the speed, acceleration, and direction of travel of the work load.

[0102] The second detection device 52 is used to detect the energy storage reserve of the energy storage device 4. The second detection device 52 includes, but is not limited to, a pressure sensor, used to detect the output pressure of the energy storage device 4 in order to determine whether the energy storage device 4 has hydraulic energy reserves.

[0103] The processor 6 is signal-connected to the motor 2, the four-quadrant pump 3, the energy storage device 4, the first detection device 51, and the second detection device 52. It is configured to switch the operating conditions of the motor 2, the four-quadrant pump 3, and / or the energy storage device 4 according to at least one of the operating status of the work load, the operating current of the motor 2, and the energy storage reserve of the energy storage device 4.

[0104] In this embodiment, by setting up a four-quadrant pump 3 and a motor 2 to be operably connected to the construction machinery vehicle 1, and by switching the operating conditions of the motor 2, the four-quadrant pump 3 and / or the energy storage device 4 according to at least one of the operating status of the working load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4, the working load of the construction machinery vehicle 1 can be driven by a combination of hydraulic energy and electrical energy, thereby improving the stability of micro-motion control under heavy load conditions such as slewing and hoisting, as well as the energy utilization rate during the hoisting process, and reducing the energy loss of the system.

[0105] refer to Figure 1 and Figure 2 In some embodiments, the processor 6 is further configured to switch the operating conditions of the motor 2 according to the operating state of the workload. In this embodiment, the operating conditions of the motor 2 can be determined according to the operating state of the workload.

[0106] refer to Figure 1 and Figure 2 In some embodiments, the construction machinery vehicle 1 has a forward rotation start-up condition, and the motor 2 is configured to provide electrical energy to the construction machinery vehicle 1 in motor mode. The processor 6 is further configured to cause the motor 2 to operate in motor mode during the forward rotation start-up condition of the construction machinery vehicle 1. In this embodiment, when the construction machinery vehicle 1 starts in forward rotation, the motor 2 operates in motor mode, driving the construction machinery vehicle 1 to rotate, thereby meeting the rotation function requirements of the construction machinery vehicle 1.

[0107] refer to Figure 1 and Figure 2In some embodiments, the processor 6 is further configured to switch the operating conditions of the motor 2, the four-quadrant pump 3, and the energy storage device 4 according to the operating status of the workload, the operating current of the motor 2, and the energy storage reserve of the energy storage device 4. In this embodiment, the operating conditions of the motor 2, the four-quadrant pump 3, and the energy storage device 4 can be switched according to the operating status of the workload, the operating current of the motor 2, and the energy storage reserve of the energy storage device 4 to ensure that sufficient energy is provided for the rotation of the construction machinery vehicle 1, thereby improving the rotational safety and stability of the construction machinery vehicle 1.

[0108] refer to Figure 1 and Figure 2 In some embodiments, the four-quadrant pump 3 is configured to provide hydraulic energy to the construction machinery vehicle 1 in motor operation mode, and the energy storage device 4 is configured to provide hydraulic energy to the four-quadrant pump 3 in energy release mode.

[0109] The processor 6 is further configured to: when the engineering machinery vehicle 1 is in the forward rotation starting condition, and the operating current of the motor 2 is greater than or equal to the preset current and the energy storage reserve of the energy storage device 4 is greater than or equal to the first preset amount, make the four-quadrant pump 3 operate in the motor condition and make the energy storage device 4 operate in the energy release condition.

[0110] In this embodiment, when the operating current of motor 2 is greater than or equal to a preset current, hydraulic energy is required to assist motor 2 in power supply. If the energy storage capacity of energy storage device 4 is greater than or equal to a first preset amount, then energy storage device 4 has hydraulic energy reserves, which can supply energy to the four-quadrant pump 3, driving the four-quadrant pump 3 to rotate, so that the four-quadrant pump 3 works in motor mode, assisting motor 2 in operation, and reducing the system's power consumption. If the energy storage capacity of energy storage device 4 is less than the first preset amount, the stored hydraulic energy of energy storage device 4 is insufficient, and the four-quadrant pump 3 does not participate in operation.

[0111] refer to Figure 1 and Figure 2 In some embodiments, the processor 6 is further configured to switch the operating conditions of the four-quadrant pump 3 and the energy storage device 4 according to the operating state of the workload. In this embodiment, the operating conditions of the four-quadrant pump 3 and the energy storage device 4 can be switched according to the operating state of the workload so that the motor can stop working when no auxiliary power supply is needed, thereby improving energy utilization.

[0112] refer to Figure 1 and Figure 2 In some embodiments, the hybrid power system also includes a brake 7 operably connected to the working load of the construction machinery vehicle 1 for braking the construction machinery vehicle 1.

[0113] The construction machinery vehicle 1 also has a forward rotation and stop operation mode. The four-quadrant pump 3 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into hydraulic energy in the pump operation mode and provide hydraulic energy to the energy storage device 4. The energy storage device 4 is configured to store the hydraulic energy provided by the four-quadrant pump 3 in the energy storage operation mode. The processor 6 is further configured to: operate the four-quadrant pump 3 in the pump operation mode and operate the energy storage device 4 in the energy storage operation mode in the forward rotation and stop operation mode of the construction machinery vehicle 1.

[0114] In this embodiment, when the construction machinery vehicle 1 is in a forward-rotating and stopped state, the variable swing angle of the four-quadrant pump 3 can be adjusted during the deceleration process, so that the four-quadrant pump 3 works in the pumping state, converting the mechanical energy of the construction machinery vehicle 1 during the deceleration process into hydraulic energy, and delivering the hydraulic energy to the energy storage device 4 for storage.

[0115] refer to Figure 1 and Figure 2 In some embodiments, the construction machinery vehicle 1 also has a reverse start condition, whereby the four-quadrant pump 3 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device 4, which is configured to store the hydraulic energy provided by the four-quadrant pump 3 in the energy storage condition.

[0116] The processor 6 is further configured to: operate the four-quadrant pump 3 in pump mode and the energy storage device 4 in energy storage mode during the reverse start-up condition of the construction machinery vehicle 1.

[0117] In this embodiment, when the construction machinery vehicle 1 starts in reverse, under heavy load conditions such as falling, the four-quadrant pump 3 can be made to work in pump mode to store hydraulic energy.

[0118] refer to Figure 1 and Figure 2 In some embodiments, the processor 6 is further configured to switch the operating conditions of the motor 2 according to the operating status of the workload and the energy storage reserve of the energy storage device 4. In this embodiment, the operating conditions of the motor 2 can be switched in combination with the operating status of the workload and the energy storage reserve of the energy storage device 4. When the motor 2 does not need to do work, it can be operated in generator mode to generate electricity and store energy.

[0119] refer to Figure 1 and Figure 2 In some embodiments, the motor 2 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into electrical energy and store the electrical energy when operating as a generator. The processor 6 is further configured to: when the energy storage reserve of the energy storage device 4 is greater than or equal to a second preset amount during the reverse start-up condition of the construction machinery vehicle 1, cause the motor 2 to operate in generator mode.

[0120] In this embodiment, under the reverse start-up condition, if the energy storage reserve of the energy storage device 4 is greater than or equal to the second preset amount, the energy storage device 4 completes hydraulic energy storage. At this time, the motor 2 can be switched to generator mode to convert mechanical energy into electrical energy for continuous storage.

[0121] refer to Figure 1 and Figure 2 In some embodiments, the hybrid power system further includes a brake 7, which is operably connected to the working load of the construction machinery vehicle 1 for braking the construction machinery vehicle 1. The input end of the reducer 11 can be connected to the motor 2 via the brake 7. Under normal conditions, the brake 7 locks the rotation mechanism of the construction machinery vehicle 1 by spring reset. When the construction machinery vehicle 1 rotates for operation, the brake 7 is opened.

[0122] The construction machinery vehicle 1 also has a reverse stop condition. The four-quadrant pump 3 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device 4. The energy storage device 4 is configured to store the hydraulic energy provided by the four-quadrant pump 3 in the energy storage condition.

[0123] The processor 6 is further configured to: operate the four-quadrant pump 3 in pump mode and the energy storage device 4 in energy storage mode when the engineering machinery vehicle 1 is in reverse stop mode.

[0124] In this embodiment, under the reverse stop condition, when the construction machinery vehicle 1 is decelerating, the variable swing angle of the four-quadrant pump 4 can be adjusted so that it operates in the pump condition.

[0125] refer to Figure 2 In some embodiments, the four-quadrant pump 3 includes a pump body 31 and a variable displacement assembly 32. The variable displacement assembly 32 is connected to the pump body 31 and is capable of rotating the pump body 31 to adjust the displacement of the pump body 31. The variable displacement assembly 32 includes a first variable displacement piston cylinder 321 and a second variable displacement piston cylinder 322.

[0126] The hybrid power system also includes a first valve 81 and a third detection device 53. The first valve 81 is located in the oil passage between the energy storage device 4 and the variable component 32, and the third detection device 53 is configured to detect the angle of the pump body 31.

[0127] The processor 6 is signal-connected to the third detection device 53 and the first valve 81, and is configured to adjust the displacement of the variable component 32 through the first valve 81 so that the four-quadrant pump 3 operates in pump mode or motor mode.

[0128] In this embodiment, the processor 6 can obtain the swing angle of the pump body 31 through the third detection device 53, thereby determining the operating condition of the four-quadrant pump 3. When it is necessary to switch the operating condition of the four-quadrant pump 3, the valve path of the first valve 81 can be adjusted to push the first variable piston cylinder 321 and / or the second variable piston cylinder 322 to move, thereby realizing the rotation of the pump body 31 and the control of the rotation angle.

[0129] refer to Figure 2 In some embodiments, the energy storage device 4 includes a first energy storage unit 41, and the hybrid power system further includes a second valve 82. The second valve 82 is disposed in the oil passage between the first energy storage unit 41 and the four-quadrant pump 3. The second valve 82 has two operating positions. When the second valve 82 is in the first operating position, the oil passage between the first energy storage unit 41 and the four-quadrant pump 3 is unidirectionally open from the four-quadrant pump 3 to the first energy storage unit 41. When the second valve 82 is in the second operating position, the oil passage between the first energy storage unit 41 and the four-quadrant pump 3 is bidirectionally open. The processor 6 is signal-connected to the second valve 82 and is configured to adjust the operating position of the second valve 82 to make the first energy storage unit 41 operate in either an energy storage condition or an energy release condition. The second valve 82 includes, but is not limited to, a two-way switching valve, an electro-proportional directional valve, an electro-hydraulic proportional directional valve, etc.

[0130] In this embodiment, the hydraulic oil of the four-quadrant pump 3 can flow unidirectionally to the first accumulator 41 by setting the second valve 82, so as to store the energy provided by the four-quadrant pump, or the first accumulator 41 and the four-quadrant pump 3 can be bidirectionally connected to supply energy to the four-quadrant pump 3, thereby realizing the switching of the operating conditions of the energy storage device 4.

[0131] refer to Figure 2 In some embodiments, the energy storage device 4 further includes a second energy storage unit 42, the maximum energy storage pressure of which is less than the maximum energy storage pressure of the first energy storage unit 41, and the second energy storage unit 42 is connected to the four-quadrant pump 3. The hybrid power system also includes a third valve 83, which is disposed in the oil passage between the first energy storage unit 41 and the second energy storage unit 42 and is configured to allow unidirectional flow from the second energy storage unit 42 to the first energy storage unit 41.

[0132] In this embodiment, a third valve 83 is provided between the second accumulator 42 and the first accumulator 41. The third valve 83 can prevent cavitation. When the four-quadrant pump 3 is working in motor mode, the first accumulator 51 has completed energy release, the second valve 10 is closed, and the four-quadrant pump 3 has not yet returned to the 0 displacement state. At this time, the oil port oil passage connected to the four-quadrant pump 3 and the first accumulator 51 will form a cavity. The third valve 83 can always introduce the hydraulic oil of the second accumulator 52 into the high-pressure side to avoid the occurrence of cavitation.

[0133] An overflow valve 85 is connected to the first accumulator 51. When the hydraulic oil in the first accumulator 41 is full, it can act as a buffer load for braking, discharging excess oil and thus maintaining stable system pressure.

[0134] refer to Figure 2 In some embodiments, the hybrid power system further includes a pilot pressure oil source 91, which is connected to the variable component 32 of the four-quadrant pump 3 to control the variable component 32 and thus switch the operating conditions of the four-quadrant pump 3. In this embodiment, a pilot pressure oil source 91 and an oil tank 92 can be set in the system. The pilot pressure oil source 91 is connected to the four-quadrant pump 3 to provide a variable control pressure source for the four-quadrant pump 3. In the initial state, the four-quadrant pump 3 is in a zero displacement state, and there is no pressure at the low-pressure oil port and the high-pressure oil port. A shuttle valve 85 can also be set in the oil line between the pilot pressure oil source 91 and the four-quadrant pump 3. The pilot pressure enters the first valve 81 through the shuttle valve 85 to wait.

[0135] refer to Figure 2 In some embodiments, the hybrid power system further includes a pilot pressure oil source 91, which is connected to the brake 7. A fourth valve 84 is disposed in the oil passage between the pilot pressure oil source 91 and the brake 7. The processor 6 is signal-connected to the fourth valve 84 and is configured to switch the on / off state of the oil passage between the pilot pressure oil source 91 and the brake 7 via the fourth valve 84 to stop or start the construction machinery vehicle.

[0136] In this embodiment, the brake 7 is connected to the oil tank 92 through the fourth valve 84. When the rotating mechanism of the construction machinery vehicle 1 is working, the pilot pressure oil source 91 supplies oil, and the fourth valve 84 is energized so that the pilot pressure opens the brake 7.

[0137] Figure 3 This is a flowchart of some embodiments of the hybrid power system control method according to the present disclosure, with reference to... Figure 3 In another aspect of the embodiments of this disclosure, a hybrid power system control method as described above is provided, including steps S1 to S2.

[0138] In step S1, the operating status of the work load is obtained through the first detection device 51, the energy storage reserve of the energy storage device 4 is obtained through the second detection device 52, and the operating current of the motor 2 is obtained.

[0139] In step S2, the operating conditions of the motor 2, the four-quadrant pump 3 and / or the energy storage device 4 are switched according to at least one of the operating status of the work load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4.

[0140] In this embodiment, the operating conditions of the motor 2, the four-quadrant pump 3 and / or the energy storage device 4 are switched according to at least one of the operating status of the working load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4. The working load of the construction machinery vehicle 1 can be driven by a combination of hydraulic energy and electrical energy, which improves the stability of micro-motion control under heavy load conditions such as slewing and hoisting, as well as the energy utilization rate during the hoisting process, and reduces the energy loss of the system.

[0141] In some embodiments, the operation of switching the operating conditions of the motor 2, the four-quadrant pump 3, and / or the energy storage device 4 based on at least one of the operating state of the work load, the operating current of the motor 2, and the energy storage reserve of the energy storage device 4 specifically includes switching the operating condition of the motor 2 according to the operating state of the work load. In this embodiment, the operating condition of the motor 2 can be determined according to the operating state of the work load.

[0142] In some embodiments, the construction machinery vehicle 1 has a forward rotation start-up condition, and the motor 2 is configured to provide electrical energy to the construction machinery vehicle 1 in electric motor mode. The operation of switching the operating condition of the motor 2 according to the operating state of the work load specifically includes: in the forward rotation start-up condition of the construction machinery vehicle 1, making the motor 2 operate in electric motor mode.

[0143] In this embodiment, when the construction machinery vehicle 1 starts rotating in the forward direction, the motor 2 operates in the motor mode, driving the construction machinery vehicle 1 to rotate, so as to meet the rotation function requirements of the construction machinery vehicle 1.

[0144] In some embodiments, the operation of switching the operating conditions of the motor 2, the four-quadrant pump 3 and / or the energy storage device 4 according to at least one of the operating state of the work load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4 specifically includes switching the operating conditions of the motor 2, the four-quadrant pump 3 and the energy storage device 4 according to the operating state of the work load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4.

[0145] In this embodiment, the operating conditions of the motor 2, the four-quadrant pump 3 and the energy storage device 4 can be switched according to the operating status of the work load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4, so as to ensure that sufficient energy is provided for the rotation of the construction machinery vehicle 1 and improve the rotation safety and stability of the construction machinery vehicle 1.

[0146] In some embodiments, the four-quadrant pump 3 is configured to provide hydraulic energy to the construction machinery vehicle 1 under motor operating conditions, and the energy storage device 4 is configured to provide hydraulic energy to the four-quadrant pump 3 under energy release conditions.

[0147] Based on the operating status of the work load, the operating current of motor 2, and the energy storage reserve of energy storage device 4, the operation of switching the operating conditions of motor 2, four-quadrant pump 3, and energy storage device 4 specifically includes: when the engineering machinery vehicle 1 is in the forward rotation starting condition, and the operating current of motor 2 is greater than or equal to the preset current and the energy storage reserve of energy storage device 4 is greater than or equal to the first preset amount, motor 2 is operated in motor condition, four-quadrant pump 3 is operated in motor condition, and energy storage device 4 is operated in energy release condition.

[0148] In this embodiment, when the operating current of motor 2 is greater than or equal to a preset current, hydraulic energy is required to assist motor 2 in power supply. If the energy storage capacity of energy storage device 4 is greater than or equal to a first preset amount, then energy storage device 4 has hydraulic energy reserves, which can supply energy to the four-quadrant pump 3, driving the four-quadrant pump 3 to rotate, so that the four-quadrant pump 3 works in motor mode, assisting motor 2 in operation, and reducing the system's power consumption. If the energy storage capacity of energy storage device 4 is less than the first preset amount, the stored hydraulic energy of energy storage device 4 is insufficient, and the four-quadrant pump 3 does not participate in operation.

[0149] In some embodiments, the operation of switching the operating conditions of the motor 2, the four-quadrant pump 3 and / or the energy storage device 4 according to at least one of the operating state of the work load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4 specifically includes switching the operating conditions of the four-quadrant pump 3 and the energy storage device 4 according to the operating state of the work load.

[0150] In this embodiment, the operating conditions of the four-quadrant pump 3 and the energy storage device 4 can be switched according to the operating status of the work load, so that the motor can stop working when no auxiliary power supply is needed, thereby improving the energy utilization rate.

[0151] In some embodiments, the hybrid power system further includes a brake 7 operably connected to the working load of the construction machinery vehicle 1 for braking the construction machinery vehicle 1; the construction machinery vehicle 1 also has a forward rotation stop condition, and the four-quadrant pump 3 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device 4, which is configured to store the hydraulic energy provided by the four-quadrant pump 3 in the energy storage condition.

[0152] The specific operation of switching the operating conditions of the four-quadrant pump 3 and the energy storage device 4 according to the operating status of the work load includes: when the construction machinery vehicle 1 is in forward rotation and stopped, the four-quadrant pump 3 is operated in pump mode, and the energy storage device 4 is operated in energy storage mode.

[0153] In this embodiment, when the construction machinery vehicle 1 is in a forward-rotating and stopped state, the variable swing angle of the four-quadrant pump 3 can be adjusted during the deceleration process, so that the four-quadrant pump 3 works in the pumping state, converting the mechanical energy of the construction machinery vehicle 1 during the deceleration process into hydraulic energy, and delivering the hydraulic energy to the energy storage device 4 for storage.

[0154] In some embodiments, the construction machinery vehicle 1 also has a reverse start condition, wherein the four-quadrant pump 3 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device 4, wherein the energy storage device 4 is configured to store the hydraulic energy provided by the four-quadrant pump 3 in the energy storage condition.

[0155] The specific operation of switching the operating conditions of the four-quadrant pump 3 and the energy storage device 4 according to the operating status of the work load includes: when the construction machinery vehicle 1 is in reverse start-up condition, the four-quadrant pump 3 is operated in pump condition, and the energy storage device 4 is operated in energy storage condition.

[0156] In this embodiment, when the construction machinery vehicle 1 starts in reverse, under heavy load conditions such as falling, the four-quadrant pump 3 can be made to work in pump mode to store hydraulic energy.

[0157] In some embodiments, the operation of switching the operating conditions of the motor 2, the four-quadrant pump 3 and / or the energy storage device 4 according to at least one of the operating state of the work load, the operating current of the motor 2 and the energy storage reserve of the energy storage device 4 specifically includes switching the operating conditions of the motor 2 according to the operating state of the work load and the energy storage reserve of the energy storage device 4.

[0158] In this embodiment, the operating conditions of the motor 2 can be switched according to the operating status of the work load and the energy storage capacity of the energy storage device 4. When the motor 2 does not need to do work, the motor 2 can be operated in the generator mode to generate electricity and store energy.

[0159] In some embodiments, the motor 2 is configured to convert the mechanical energy provided by the engineering vehicle 1 into electrical energy in generator operation and to store the electrical energy.

[0160] Based on the operating status of the work load and the energy storage reserve of the energy storage device 4, the operation of switching the operating conditions of the motor 2 specifically includes: when the reverse start condition of the construction machinery vehicle 1 is such that the energy storage reserve of the energy storage device 4 is greater than or equal to the second preset amount, the motor 2 is operated in generator condition.

[0161] In this embodiment, under the reverse start-up condition, if the energy storage reserve of the energy storage device 4 is greater than or equal to the second preset amount, the energy storage device 4 completes hydraulic energy storage. At this time, the motor 2 can be switched to generator mode to convert mechanical energy into electrical energy for continuous storage.

[0162] In some embodiments, the hybrid power system further includes: a brake 7 operably connected to the working load of the construction machinery vehicle 1 for braking the construction machinery vehicle 1; the construction machinery vehicle 1 also has a reverse stop condition, wherein the four-quadrant pump 3 is configured to convert the mechanical energy provided by the construction machinery vehicle 1 into hydraulic energy in the pump condition and provide hydraulic energy to the energy storage device 4, wherein the energy storage device 4 is configured to store the hydraulic energy provided by the four-quadrant pump 3 in the energy storage condition.

[0163] The specific operation of switching the operating conditions of the four-quadrant pump 3 and the energy storage device 4 according to the operating status of the work load includes: when the construction machinery vehicle 1 is in reverse stop condition, the four-quadrant pump 3 is operated in pump condition, and the energy storage device 4 is operated in energy storage condition.

[0164] In this embodiment, under the reverse stop condition, when the construction machinery vehicle 1 is decelerating, the variable swing angle of the four-quadrant pump 4 can be adjusted so that it operates in the pump condition.

[0165] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0166] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A hybrid power system for providing power to an engineering machinery vehicle (1), characterized in that, include: The motor (2) is operably connected to the working load of the engineering machinery vehicle (1) and has both motor mode and generator mode. The four-quadrant pump (3) is operably connected to the working load of the engineering machinery vehicle (1) and has a pump mode and a motor mode. The four-quadrant pump (3) includes a pump body (31) and a variable component (32). The variable component (32) is connected to the pump body (31) and can drive the pump body (31) to rotate in order to adjust the variable of the pump body (31). The energy storage device (4) is connected to the four-quadrant pump (3) and has energy storage and energy release modes; The first detection device (51) is used to detect the operating status of the work load; The second detection device (52) is used to detect the energy storage capacity of the energy storage device (4); The first valve (81) is located in the oil passage between the energy storage device (4) and the variable component (32); The third detection device (53) is configured to detect the variable angle of the pump body (31); and The processor (6), which is signal-connected to the motor (2), the four-quadrant pump (3), the energy storage device (4), the first detection device (51), the second detection device (52), the third detection device (53), and the first valve (81), is configured to switch the operating conditions of the motor (2), the four-quadrant pump (3), and / or the energy storage device (4) according to at least one of the operating status of the work load, the operating current of the motor (2), and the energy storage reserve of the energy storage device (4), and to adjust the displacement of the variable component (32) through the first valve (81) so that the four-quadrant pump (3) operates in the pump condition or the motor condition.

2. The hybrid power system as described in claim 1, characterized in that, The processor (6) is further configured to switch the operating conditions of the motor (2) according to the operating status of the workload.

3. The hybrid power system as described in claim 2, characterized in that, The engineering machinery vehicle (1) has a forward rotation start-up condition, and the motor (2) is configured to provide electrical energy to the engineering machinery vehicle (1) under the motor operation condition; The processor (6) is further configured to: make the motor (2) run in the motor condition when the engineering machinery vehicle (1) is in the forward rotation start-up condition.

4. The hybrid power system as described in claim 1, characterized in that, The processor (6) is further configured to switch the operating conditions of the motor (2), the four-quadrant pump (3) and the energy storage device (4) according to the operating status of the workload, the operating current of the motor (2) and the energy storage reserve of the energy storage device (4).

5. The hybrid power system as described in claim 4, characterized in that, The four-quadrant pump (3) is configured to provide hydraulic energy to the engineering machinery vehicle (1) under the motor operating condition, and the energy storage device (4) is configured to provide hydraulic energy to the four-quadrant pump (3) under the energy release condition; The processor (6) is further configured to: when the engineering machinery vehicle (1) is in the forward rotation start-up condition, and the operating current of the motor (2) is greater than or equal to the preset current and the energy storage reserve of the energy storage device (4) is greater than or equal to the first preset amount, to make the four-quadrant pump (3) operate in the motor condition and to make the energy storage device (4) operate in the energy release condition.

6. The hybrid power system as claimed in claim 1, characterized in that, The processor (6) is further configured to switch the operating conditions of the four-quadrant pump (3) and the energy storage device (4) according to the operating status of the workload.

7. The hybrid power system as described in claim 6, characterized in that, Also includes: Brake (7), operably connected to the working load of the engineering machinery vehicle (1), for braking the engineering machinery vehicle (1). The engineering machinery vehicle (1) also has a forward rotation stop condition. The four-quadrant pump (3) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into hydraulic energy under the pump condition and provide the hydraulic energy to the energy storage device (4). The energy storage device (4) is configured to store the hydraulic energy provided by the four-quadrant pump (3) under the energy storage condition. The processor (6) is further configured to: operate the four-quadrant pump (3) in the pumping condition and operate the energy storage device (4) in the energy storage condition when the engineering machinery vehicle (1) is in a forward rotation stop condition.

8. The hybrid power system as described in claim 6, characterized in that, The engineering machinery vehicle (1) also has a reverse start condition. The four-quadrant pump (3) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into hydraulic energy under the pump condition and provide the hydraulic energy to the energy storage device (4). The energy storage device (4) is configured to store the hydraulic energy provided by the four-quadrant pump (3) under the energy storage condition. The processor (6) is further configured to: operate the four-quadrant pump (3) in the pumping condition and operate the energy storage device (4) in the energy storage condition during the reverse start-up condition of the engineering machinery vehicle (1).

9. The hybrid power system as claimed in claim 1, characterized in that, The processor (6) is further configured to switch the operating conditions of the motor (2) according to the operating status of the workload and the energy storage capacity of the energy storage device (4).

10. The hybrid power system as claimed in claim 9, characterized in that, The motor (2) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into electrical energy under the generator operating condition, and to store the electrical energy; The processor (6) is further configured to: when the reverse start-up condition of the engineering machinery vehicle (1) is such that the energy storage reserve of the energy storage device (4) is greater than or equal to the second preset amount, the motor (2) is made to operate in the generator condition.

11. The hybrid power system as claimed in claim 6, characterized in that, Also includes: Brake (7), operably connected to the working load of the engineering machinery vehicle (1), for braking the engineering machinery vehicle (1). The engineering machinery vehicle (1) also has a reverse stop condition. The four-quadrant pump (3) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into hydraulic energy under the pump condition and provide the hydraulic energy to the energy storage device (4). The energy storage device (4) is configured to store the hydraulic energy provided by the four-quadrant pump (3) under the energy storage condition. The processor (6) is further configured to: operate the four-quadrant pump (3) in the pumping condition and operate the energy storage device (4) in the energy storage condition when the engineering machinery vehicle (1) is in reverse stop condition.

12. The hybrid power system as described in any one of claims 1 to 11, characterized in that, Energy storage device (4) includes: First accumulator (41); The hybrid power system further includes: The second valve (82) is disposed in the oil passage between the first accumulator (41) and the four-quadrant pump (3). The second valve (82) has two working positions. When the second valve (82) is in the first working position, the oil passage between the first accumulator (41) and the four-quadrant pump (3) is unidirectionally connected from the four-quadrant pump (3) to the first accumulator (41). When the second valve (82) is in the second working position, the oil passage between the first accumulator (41) and the four-quadrant pump (3) is bidirectionally connected. The processor (6) is signal-connected to the second valve (82) and is configured to adjust the working position of the second valve (82) so that the first energy storage device (41) operates in the energy storage condition or the energy release condition.

13. The hybrid power system as claimed in claim 12, characterized in that, The energy storage device (4) also includes: The second accumulator (42) is connected to the four-quadrant pump (3), and the maximum energy storage pressure of the second accumulator (42) is less than the maximum energy storage pressure of the first accumulator (41). The hybrid power system further includes: A third valve (83) is disposed in the oil line between the first accumulator (41) and the second accumulator (42) and is configured to allow the second accumulator (42) to unidirectionally flow to the first accumulator (41).

14. The hybrid power system as described in any one of claims 1 to 11, characterized in that, Also includes: The pilot pressure oil source (91) is connected to the variable component (32) of the four-quadrant pump (3).

15. The hybrid power system as described in claim 7 or 11, characterized in that, Also includes: A pilot pressure oil source (91) is connected to the brake (7); The fourth valve (84) is located in the oil circuit between the pilot pressure oil source (91) and the brake (7); The processor (6) is signal-connected to the fourth valve (84) and is configured to switch the oil circuit between the pilot pressure oil source (91) and the brake (7) through the fourth valve (84) so ​​that the engineering machinery vehicle (1) stops or starts.

16. A hybrid power system control method for a hybrid power system as described in any one of claims 1 to 15, characterized in that, include: The first detection device (51) obtains the operating status of the work load, the second detection device (52) obtains the energy storage reserve of the energy storage device (4), and obtains the operating current of the motor (2). Based on at least one of the operating status of the work load, the operating current of the motor (2), and the energy storage capacity of the energy storage device (4), switch the operating conditions of the motor (2), the four-quadrant pump (3), and / or the energy storage device (4).

17. The hybrid power system control method as described in claim 16, characterized in that, The operation of switching the operating conditions of the motor (2), the four-quadrant pump (3), and / or the energy storage device (4) based on at least one of the operating status of the work load, the operating current of the motor (2), and the energy storage reserve of the energy storage device (4) specifically includes: The operating conditions of the motor (2) are switched according to the operating status of the work load.

18. The hybrid power system control method as described in claim 17, characterized in that, The engineering machinery vehicle (1) has a forward rotation start-up condition, and the motor (2) is configured to provide electrical energy to the engineering machinery vehicle (1) under the motor operation condition; Specifically, the operation of switching the operating conditions of the motor (2) according to the operating status of the workload includes: When the engineering machinery vehicle (1) is in forward rotation starting condition, the motor (2) is made to run in the motor condition.

19. The hybrid power system control method as described in claim 16, characterized in that, The operation of switching the operating conditions of the motor (2), the four-quadrant pump (3), and / or the energy storage device (4) based on at least one of the operating status of the work load, the operating current of the motor (2), and the energy storage reserve of the energy storage device (4) specifically includes: Based on the operating status of the work load, the operating current of the motor (2) and the energy storage capacity of the energy storage device (4), switch the operating conditions of the motor (2), the four-quadrant pump (3) and the energy storage device (4).

20. The hybrid power system control method as described in claim 19, characterized in that, The four-quadrant pump (3) is configured to provide hydraulic energy to the engineering machinery vehicle (1) under the motor operating condition, and the energy storage device (4) is configured to provide hydraulic energy to the four-quadrant pump (3) under the energy release condition; The operation of switching the operating conditions of the motor (2), the four-quadrant pump (3), and the energy storage device (4) according to the operating status of the work load, the operating current of the motor (2), and the energy storage reserve of the energy storage device (4) specifically includes: When the engineering machinery vehicle (1) is in the forward rotation starting condition, and the operating current of the motor (2) is greater than or equal to the preset current and the energy storage capacity of the energy storage device (4) is greater than or equal to the first preset amount, the motor (2) is operated in the motor condition, the four-quadrant pump (3) is operated in the motor condition, and the energy storage device (4) is operated in the energy release condition.

21. The hybrid power system control method as described in claim 16, characterized in that, The operation of switching the operating conditions of the motor (2), the four-quadrant pump (3), and / or the energy storage device (4) based on at least one of the operating status of the work load, the operating current of the motor (2), and the energy storage reserve of the energy storage device (4) specifically includes: According to the operating status of the work load, switch the operating conditions of the four-quadrant pump (3) and the energy storage device (4).

22. The hybrid power system control method as described in claim 21, characterized in that, The hybrid power system also includes a brake (7) operably connected to the working load of the construction machinery vehicle (1) for braking the construction machinery vehicle (1); the construction machinery vehicle (1) also has a forward rotation stop condition, the four-quadrant pump (3) is configured to convert the mechanical energy provided by the construction machinery vehicle (1) into hydraulic energy in the pump condition and provide the hydraulic energy to the energy storage device (4), the energy storage device (4) is configured to store the hydraulic energy provided by the four-quadrant pump (3) in the energy storage condition; Specifically, the operation of switching the operating conditions of the four-quadrant pump (3) and the energy storage device (4) according to the operating status of the workload includes: When the engineering machinery vehicle (1) is in a forward rotation and stopped condition, the four-quadrant pump (3) is operated in the pump condition, and the energy storage device (4) is operated in the energy storage condition.

23. The hybrid power system control method as described in claim 21, characterized in that, The engineering machinery vehicle (1) also has a reverse start condition. The four-quadrant pump (3) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into hydraulic energy under the pump condition and provide the hydraulic energy to the energy storage device (4). The energy storage device (4) is configured to store the hydraulic energy provided by the four-quadrant pump (3) under the energy storage condition. Specifically, the operation of switching the operating conditions of the four-quadrant pump (3) and the energy storage device (4) according to the operating status of the workload includes: In the reverse start-up condition of the engineering machinery vehicle (1), the four-quadrant pump (3) is operated in the pump condition, and the energy storage device (4) is operated in the energy storage condition.

24. The hybrid power system control method as described in claim 16, characterized in that, The operation of switching the operating conditions of the motor (2), the four-quadrant pump (3), and / or the energy storage device (4) based on at least one of the operating status of the work load, the operating current of the motor (2), and the energy storage reserve of the energy storage device (4) specifically includes: The operating conditions of the motor (2) are switched according to the operating status of the work load and the energy storage capacity of the energy storage device (4).

25. The hybrid power system control method as described in claim 24, characterized in that, The motor (2) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into electrical energy under the generator operating condition, and to store the electrical energy; Specifically, the operation of switching the operating conditions of the motor (2) according to the operating status of the workload and the energy storage capacity of the energy storage device (4) includes: When the reverse start-up condition of the engineering machinery vehicle (1) is such that the energy storage capacity of the energy storage device (4) is greater than or equal to the second preset amount, the motor (2) is made to operate in the generator condition.

26. The hybrid power system control method as described in claim 21, characterized in that, The hybrid power system further includes: a brake (7) operably connected to the working load of the engineering machinery vehicle (1) for braking the engineering machinery vehicle (1); the engineering machinery vehicle (1) also has a reverse stop condition, the four-quadrant pump (3) is configured to convert the mechanical energy provided by the engineering machinery vehicle (1) into hydraulic energy in the pump condition and provide the hydraulic energy to the energy storage device (4), the energy storage device (4) being configured to store the hydraulic energy provided by the four-quadrant pump (3) in the energy storage condition; Specifically, the operation of switching the operating conditions of the four-quadrant pump (3) and the energy storage device (4) according to the operating status of the workload includes: In the reverse stop condition of the engineering machinery vehicle (1), the four-quadrant pump (3) is operated in the pump condition, and the energy storage device (4) is operated in the energy storage condition.

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