CN212654343U - Power control device for hybrid excavator - Google Patents
Power control device for hybrid excavator Download PDFInfo
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- CN212654343U CN212654343U CN202022048302.XU CN202022048302U CN212654343U CN 212654343 U CN212654343 U CN 212654343U CN 202022048302 U CN202022048302 U CN 202022048302U CN 212654343 U CN212654343 U CN 212654343U
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Abstract
The utility model provides a power control device for hybrid excavator, include: electricity generation unit, main pump electric drive unit and electric power energy storage unit, electricity generation unit includes: the system comprises an engine controller, a complete machine controller, an engine, a generator/motor, a first inverter, a communication bus and a direct current bus, wherein the complete machine controller is accessed to the communication bus, the engine controller is accessed to the communication bus and is also connected with the engine, the generator/motor is connected with the engine and the first inverter, and the first inverter is also connected with the direct current bus; the main pump electric drive unit includes: the second inverter is respectively connected with the direct current bus and the motor, and the motor is also respectively connected with the traveling device and the working device; the power energy storage unit includes: the direct current-direct current rectifier is connected with the capacitor battery and is connected to the direct current bus. The fuel economy of the engine can be improved.
Description
Technical Field
The utility model relates to an engineering machine tool technical field particularly, relates to a power control device for hybrid excavator.
Background
The excavator is one of main machines in the field of engineering machinery, and with the rapid development of economy, the market reservation quantity of the excavator is larger and larger. The excavator is generally applied to the scenes with severe environments such as mines, fields and the like, the load change is severe, the load is periodically switched from no load to full load or even overload, and the severe change of the load causes severe fluctuation of the torque and the rotating speed of an engine, so that the engine (engine) always works under the transient working condition, the engine is flamed out and crashed, and the working reliability of the excavator is reduced.
At present, in order to improve the working reliability of an excavator, a hybrid power technology is provided, that is, an energy supply mode combining an engine and a storage battery is adopted, and when a load is changed rapidly, auxiliary power is provided for the load through discharging of the storage battery on the premise that the maximum output power of the engine cannot meet the required power of the load, so that flameout caused by the fact that the output power of the engine cannot meet the load temporarily is avoided. However, according to the power control method for the hybrid excavator, when the maximum output power of the engine cannot meet the power demand of the load, the storage battery is started to serve as the auxiliary energy supply unit, and the engine still usually works under the transient working condition, so that the fuel economy and the emission performance are poor, and the working efficiency is low.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a power control device for a hybrid excavator to improve fuel economy of an engine.
In a first aspect, an embodiment of the present invention provides a power control device for a hybrid excavator, including: a power generation unit, a main pump electric drive unit and an electric energy storage unit, wherein,
the power generation unit includes: an engine controller, a complete machine controller, an engine, a generator/motor, a first inverter, a communication bus and a direct current bus, wherein,
the whole machine controller is connected with a communication bus, one end of the engine controller is connected with the communication bus, the other end of the engine controller is connected with one end of the engine, the other end of the engine is connected with one end of the generator/motor, the other end of the generator/motor is connected with one end of a first inverter, and the other end of the first inverter is connected with a direct current bus;
a main pump electric drive unit comprising: a second inverter, a motor, a traveling device, and a working device, wherein,
one end of the second inverter is connected with the direct-current bus, the other end of the second inverter is connected with one end of the motor, and the other end of the motor is respectively connected with the traveling device and the working device;
a power storage unit comprising: a capacitor battery, and a dc-dc rectifier, wherein,
the capacitor battery is connected with one end of the direct current-direct current rectifier, and the other end of the direct current-direct current rectifier is connected to the direct current bus.
With reference to the first aspect, embodiments of the present invention provide a first possible implementation manner of the first aspect, wherein the power generation unit further includes:
and one end of the first coupling is connected with the other end of the engine, and the other end of the first coupling is connected with one end of the generator/motor.
In combination with the first aspect, embodiments of the present invention provide a second possible implementation manner of the first aspect, wherein the main pump electric drive unit further includes: a second coupling, a hydraulic main pump, a hydraulic main valve, a walking motor and a hydraulic oil cylinder, wherein,
one end of the second coupler is connected with the other end of the motor, the other end of the second coupler is connected with one end of the hydraulic main pump, the other end of the hydraulic main pump is connected with one end of the hydraulic main valve, the other end of the hydraulic main valve is connected with one end of the traveling motor and one end of the hydraulic oil cylinder respectively, the other end of the traveling motor is connected with the traveling device, and the other end of the hydraulic oil cylinder is connected with the working device.
In combination with the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the power energy storage unit further includes:
and one end of the inductor is connected with the capacitor battery, and the other end of the inductor is connected with one end of the direct current-direct current rectifier.
In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the dc-dc rectifier is further configured to be connected to a communication bus, receive a charging instruction output by the complete machine controller, and charge the capacitor battery after performing rectification transformation on the dc voltage obtained from the dc bus.
In combination with the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the first inverter is further configured to be connected to a communication bus, receive a power generation instruction output by the complete machine controller, switch a current normal operating mode to an energy consumption mode, and perform ac conversion on a dc voltage obtained from a dc bus to output an ac power, so as to drive the generator/motor to convert the ac power into mechanical energy, thereby driving the engine to operate.
With reference to the first aspect and any one of the first to fifth possible implementation manners of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the power control device further includes:
a swing electric drive unit comprising: a third inverter, a rotary motor, a rotary reducer, a rotary device and a rotary brake, wherein,
one end of the third inverter is connected with the direct-current bus, the other end of the third inverter is connected with one end of the rotary motor, the other end of the rotary motor is respectively connected with one end of the rotary speed reducer and the rotary brake, and the other end of the rotary speed reducer is connected with the rotary device.
With reference to the first aspect and any one of the first to fifth possible implementation manners of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the power control device further includes:
and the whole machine display is connected with the communication bus and is used for displaying the instruction output by the whole machine controller and the current running states of the engine, the capacitor battery, the walking device, the working device and the rotary motor.
The embodiment of the utility model provides a power control device for hybrid excavator, include: the power generation unit, main pump electric drive unit and electric power energy storage unit, wherein, the power generation unit includes: the system comprises an engine controller, a complete machine controller, an engine, a generator/motor, a first inverter, a communication bus and a direct current bus, wherein the complete machine controller is connected into the communication bus, one end of the engine controller is connected into the communication bus, the other end of the engine controller is connected with one end of the engine, the other end of the engine is connected with one end of the generator/motor, the other end of the generator/motor is connected with one end of the first inverter, and the other end of the first inverter is connected with the direct current bus; a main pump electric drive unit comprising: the system comprises a second inverter, a motor, a traveling device and a working device, wherein one end of the second inverter is connected with a direct-current bus, the other end of the second inverter is connected with one end of the motor, and the other end of the motor is respectively connected with the traveling device and the working device; a power storage unit comprising: the capacitor battery is connected with one end of the DC-DC rectifier, and the other end of the DC-DC rectifier is connected to the DC bus. Therefore, the output power of the engine can be maintained at the optimized output power based on the optimized output power corresponding to the optimal efficiency of the engine, and the fuel economy of the engine is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram illustrating a power control device for a hybrid excavator according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a power control method for a hybrid excavator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a computer device 300 according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
At present, in the scene (working condition) that the load changes sharply when the hybrid excavator works, if the maximum output power of the engine cannot meet the required power of the load, auxiliary power is provided for the load through discharging of the storage battery, and because the engine works under the transient working condition frequently, the fuel economy and the emission performance are poor, and the working efficiency is low. The embodiment of the utility model provides an in, based on the optimization output that the optimal efficiency of engine corresponds, make the output of engine maintain optimizing output, through setting up the electric capacity battery, utilize the load of the violent change of charge-discharge characteristic balance of electric capacity battery to control the operating point of engine in the optimal region of fuel oil consumption, promote the fuel economy of engine.
An embodiment of the present invention provides a power control device for a hybrid excavator, which is described below by way of an embodiment.
Fig. 1 shows a schematic structural diagram of a power control device for a hybrid excavator according to an embodiment of the present invention. As shown in fig. 1, the power control apparatus includes: a power generation unit 10, a main pump electric drive unit 20, and an electric power storage unit 30, wherein,
the power generation unit 10 includes: engine controller 100, complete machine controller 101, engine 103, generator/motor 105, first inverter 106, communication bus 124, dc bus 125, wherein,
the whole machine controller 101 is connected to a communication bus 124, one end of the engine controller 100 is connected to the communication bus 124, the other end of the engine controller 100 is connected to one end of the engine 103, the other end of the engine 103 is connected to one end of the generator/motor 105, the other end of the generator/motor 105 is connected to one end of the first inverter 106, and the other end of the first inverter 106 is connected to a direct current bus 125;
a main pump electric drive unit 20, comprising: a second inverter 107, a motor 108, a traveling device 113, and a working device 115, wherein,
one end of the second inverter 107 is connected to the dc bus 125, the other end is connected to one end of the motor 108, and the other end of the motor 108 is connected to the traveling device 113 and the working device 115, respectively;
a power storage unit 30 comprising: a capacitive battery 116, and a dc-dc rectifier 118, wherein,
the capacitor 116 is connected to one end of the dc-dc rectifier 118, and the other end of the dc-dc rectifier 118 is connected to the dc bus 125.
In the embodiment of the present invention, the whole machine controller 101 obtains the required power of the load (the traveling device 113 and/or the working device 115), and compares the required power with the optimized output power of the preset engine, wherein the optimized output power of the engine is the output power corresponding to the optimal efficiency of the engine 103; if it is determined that the required power is larger than the engine optimized output power, a power difference between the required power and the engine optimized output power is calculated, an optimized output power command (a rotational speed command) is output to the engine controller 100 through the communication bus 124, and a power difference command is output to the capacitor battery 116 through the communication bus 124.
The engine controller 100 controls or adjusts the rotation speed of the engine 103 according to the received optimized output power command to output the optimized output power of the engine, the generator/motor 105 converts the mechanical energy corresponding to the optimized output power of the engine output by the engine 103 into alternating current, and the first inverter 106 converts the alternating current into direct current to output to the direct current bus 125.
The capacitor battery outputs the direct current corresponding to the power difference according to the received power difference instruction, and the direct current-direct current rectifier 118 rectifies the direct current and outputs the rectified direct current to the direct current bus 125.
The second inverter 107 converts the direct current obtained from the direct current bus 125 into alternating current, outputs the alternating current to the motor 108 to drive the motor 108, and drives the traveling device 113 and the working device 115 with the mechanical energy of the motor 108.
The embodiment of the utility model provides an in, power generation unit, main pump electric drive unit and electric power energy storage unit constitute a tandem type hybrid excavator, through setting up the output that engine work corresponds at the optimal efficiency, change at the load sharply, when output can not satisfy the demand power of load, utilize the discharge of electric capacity battery to provide supplementary energy supply for the engine can operate on the output that the optimal efficiency corresponds, fuel economy and emission have effectively been improved, the work efficiency of hybrid excavator has been promoted.
The embodiment of the utility model provides an in, if the output of engine 103 is the engine output that optimizes, then maintain the current rotational speed of engine 103 can.
The embodiment of the utility model provides an in, optimize output power can satisfy the load and have under the abundant condition at the engine of engine output, can charge electric capacity battery 116 to electric capacity battery 116 can provide auxiliary power under comparatively abominable scene, therefore, as an optional embodiment, direct current-direct current rectifier 118 still is used for linking to each other with communication bus 124, receives the instruction of charging of complete machine controller 101 output, after carrying out rectification transform from the direct current voltage that direct current bus acquireed, charges electric capacity battery 116.
In the embodiment of the present invention, the engine 103 can also be used as an energy consuming component in the shutdown discharging process of the hybrid excavator, and therefore, as an optional embodiment, the first inverter 106 is further used to connect to the communication bus 124, receive the power generation command output by the complete machine controller 101, switch the current normal operating mode to be the energy consuming mode, and perform ac transformation to output ac power on the dc voltage obtained from the dc bus, so as to drive the generator/motor 105 to convert the ac power into mechanical energy, and drive the engine 103 to operate. Thus, the engine 103 converts the chemical energy of combustion into mechanical energy during normal operation, and serves as a load for consuming electric energy during the complete machine discharge shutdown; and the generator/motor 105 is used for converting mechanical energy output by the engine 103 into electric energy in normal operation, and is used for converting electric energy on a direct current bus into mechanical energy in the discharge shutdown process of the whole machine, so as to drive the engine 103 to run for consuming energy.
In the embodiment of the present invention, as an optional embodiment, the engine 103 and the generator/motor 105 can also be connected by a coupling to buffer and damp the power transmission of high speed and heavy load, and therefore, the power generation unit 10 further includes:
a first coupling 104 has one end connected to the other end of the engine 103 and the other end connected to one end of a generator/motor 105.
In the embodiment of the present invention, as another optional embodiment, the main pump electric driving unit 20 further includes: a second coupling 109, a hydraulic main pump 110, a hydraulic main valve 111, a travel motor 112, and a hydraulic cylinder 114, wherein,
one end of the second coupling 109 is connected to the other end of the electric motor 108, the other end is connected to one end of a hydraulic main pump 110, the other end of the hydraulic main pump 110 is connected to one end of a hydraulic main valve 111, the other end of the hydraulic main valve 111 is connected to one end of a traveling motor 112 and one end of a hydraulic cylinder 114, the other end of the traveling motor 112 is connected to a traveling device 113, and the other end of the hydraulic cylinder 114 is connected to a working device 115.
The embodiment of the utility model provides an in, motor 108 drives hydraulic main pump 110 through second shaft coupling 109, and hydraulic main pump 110 passes through hydraulic main valve 111 and drives walking motor 112 and hydraulic cylinder 114 respectively, and walking motor 112 drives running gear 113, and hydraulic cylinder 114 drives equipment 115.
In the embodiment of the present invention, in order to prevent that the capacitor battery discharges too fast to lead to the violent fluctuation of voltage of direct current bus, as another optional embodiment, electric power energy storage unit 30 still includes:
and an inductor 117 having one end connected to the capacitor cell 116 and the other end connected to one end of the dc-dc rectifier 118.
In an embodiment of the present invention, as another optional embodiment, the power control apparatus further includes:
the swing electric drive unit 40 includes: a third inverter 119, a swing motor 120, a swing reducer 121, a swing device 122, and a swing brake 123, wherein,
one end of the third inverter 119 is connected to the dc bus 125, and the other end is connected to one end of the rotation motor 120, the other end of the rotation motor 120 is connected to one end of the rotation reducer 121 and the rotation brake 123, respectively, and the other end of the rotation reducer 121 is connected to the rotation device 122.
In the embodiment of the present invention, the third inverter 119 is connected to the communication bus 124 for receiving the rotation request outputted by the complete machine controller 101 and controlling the rotation braking energy recovery. The slewing motor 120 drives the slewing device 122 to go up and slew via the slewing reducer 121, and the third inverter 119 is used for operation of the slewing motor 120 and recovery of slewing energy.
In an embodiment of the present invention, as another optional embodiment, the power control apparatus further includes:
and the whole machine display 102 is connected with the communication bus 124 and displays instructions output by the whole machine controller 101 and the current running states of the engine 103, the capacitor battery 116, the walking device 113, the working device 115 and the rotary motor 120.
The embodiment of the utility model provides an in, complete machine display 102 shows each item parameter of hybrid excavator operation to can set up the controlling part that is used for controlling hybrid excavator on it, the driver of the hybrid excavator of being convenient for controls hybrid excavator.
In the embodiment of the present invention, the communication bus 124 is respectively connected to the complete machine controller 101, the engine controller 100, the complete machine display 102, the second inverter 107, the third inverter 119, and the dc-dc rectifier 118.
And a dc bus 125 connected to the first inverter 106, the second inverter 107, the third inverter 119, and the dc-dc rectifier 118, respectively, and configured to transmit power to the first inverter 106, the second inverter 107, the third inverter 119, and the dc-dc rectifier 118 for power management and energy distribution.
And the whole machine controller 101 is used for coordinating and controlling the whole machine of the hybrid excavator to work, and optimizing the energy consumption of the whole machine so as to improve the performance and the operation efficiency of the whole machine.
A first inverter 106 for dc-converting the ac power outputted from the generator/motor 105 to output to the dc bus 125 and ac-converting the dc power outputted from the dc bus to output to the generator/motor 105 for power generation and power consumption;
the embodiment of the utility model provides an in, through the voltage of control direct current bus, can realize electric power system's power management and energy control.
The embodiment of the utility model provides an in, can preset the engine speed, the engine optimizes output, the maximum output of engine, the motor speed, the maximum output of motor, direct current bus voltage, the electric capacity battery electric quantity of the utmost point, first priority, second priority and third priority, wherein, first priority is for keeping direct current bus voltage, the second priority is greater than the electric quantity of the minimum for guaranteeing electric capacity battery electric quantity, the constant power output of third priority for guaranteeing the constant rotational speed of engine, and thus, be convenient for to the power control of hybrid excavator.
Fig. 2 shows a schematic flow chart of a power control method for a hybrid excavator according to an embodiment of the present invention. Wherein the method is applied to the power control device of fig. 1, as shown in fig. 2, the method comprises:
in the embodiment of the present invention, as an optional embodiment, obtain the demand power of load, include:
and monitoring the voltage of a direct current bus on the hybrid excavator, and obtaining the power demand mapped by the monitored direct current bus voltage according to the preset mapping relation between the bus voltage and the power.
In the embodiment of the utility model provides an in, as an optional embodiment, hybrid excavator realizes power control through the direct current generating line. For example, when the monitored dc bus voltage is higher, it indicates that the load of the hybrid excavator at this time is light, and the current output power is greater than the required power of the load, and when the monitored dc bus voltage is lower, it indicates that the load of the hybrid excavator at this time is heavy, and the current output power is less than the required power of the load. Therefore, the change of the required power of the load can be obtained by presetting the mapping relation between the voltage of the direct current bus and the required power of the load and monitoring the voltage of the direct current bus.
The embodiment of the utility model provides an in, as another optional embodiment, also can be by the real-time environment of hybrid excavator's driver according to observing, confirm the demand power of load, for example, if hybrid excavator runs into hard operating mode, through the hard operating mode on the pressing display screen, hybrid excavator acquires the demand power of the load of hard operating mode mapping through the mapping relation of the operating mode that the inquiry set up in advance and demand power.
In an embodiment of the present invention, as an optional embodiment, after calculating the power difference between the required power and the optimized output power of the engine, before controlling the capacitor battery in the hybrid excavator to output the power difference, the method further includes:
and if the ratio of the power difference to the optimized output power of the engine is smaller than a preset percentage threshold, waiting for a preset next acquisition period, and executing the step of acquiring the required power of the load, and if the ratio is not smaller than the preset percentage threshold, executing the step of controlling a capacitor battery in the hybrid excavator to output the power difference.
The embodiment of the utility model provides an in, if demand power and engine optimize output's power difference at the within range that sets up in advance, can regard as the normal fluctuation of load, need not adjust the output of engine this moment, also need not the electric capacity battery to provide supplementary output.
In an embodiment of the present invention, as an optional embodiment, after the if the ratio is not less than the preset percentage threshold, before the controlling the output of the capacitor battery in the hybrid excavator to the power difference, the method further includes:
acquiring the current electric quantity of the capacitor battery, and judging whether the current electric quantity is smaller than the minimum threshold electric quantity:
if the current electric quantity is not less than the minimum threshold electric quantity, controlling a capacitor battery in the hybrid excavator to output the power difference;
if the current electric quantity is smaller than the minimum threshold electric quantity, judging whether the required power is smaller than the maximum output power of the engine, if so, adjusting the output power of the engine to be larger than the required power so as to provide the required power and the charging power of the capacitor battery, and if not, adjusting the output power of the engine to be the maximum output power of the engine.
The embodiment of the utility model provides an in, be greater than under the situation that the engine optimized output and electric capacity battery can not the energy supply at demand power, in order to avoid the engine because the too big flame-out that leads to of load, promote the demand power of the output of engine in order to satisfy the load to provide the charging to electric capacity battery. Of course, in practical applications, the more the output power deviates from the optimal output power of the engine, the worse the fuel economy, and as an alternative embodiment, the charging power provided to the capacitor battery may be set to zero.
In the embodiment of the present invention, as an optional embodiment, the method further includes:
if the required power is smaller than the optimized output power of the engine, acquiring the current electric quantity of the capacitor battery, and judging whether the current electric quantity is smaller than the maximum threshold electric quantity:
if the current electric quantity is smaller than the maximum threshold electric quantity, maintaining the optimized output power of the engine to provide the required power and the charging power of the capacitor battery;
and if the current electric quantity is not less than the maximum threshold electric quantity, adjusting the optimized output power of the engine to the required power.
The embodiment of the utility model provides an in, because the engine optimizes output is the output that the engine most efficient corresponds, therefore, be less than under the condition that the engine optimized output at demand power, can utilize the power to charge to the electric capacity battery for the engine maintains this engine and optimizes output, thereby effectively promotes the fuel nature of engine.
The embodiment of the utility model provides an in, under the condition that demand power equals engine optimization output, it can to maintain current engine optimization output.
The embodiment of the utility model provides an in, hybrid excavator's operating voltage is high-voltage electricity, has very big danger, for guaranteeing hybrid excavator's safe, reliable, stable operation, at hybrid excavator's each working phase, increases the protection strategy to hybrid excavator. Thus, as an alternative embodiment, before obtaining the required power of the load, the method further comprises:
after the hybrid excavator is powered on, the hybrid excavator is subjected to self-checking, if the self-checking is unsuccessful, the engine is prohibited from being started, preset electronic elements are prohibited from being enabled, and if the self-checking is successful, the engine is started.
The embodiment of the utility model provides an in, whole machine (hybrid excavator) goes up the electricity back, and electric power system, engine system, complete machine control system among the hybrid excavator carry out the self-checking, accomplish and feed back the self-checking before successful, do not allow the engine to start, do not allow electric power system (electronic component) to enable, also do not allow electric power system to enable after the self-checking is successful to load suggestion operating personnel in the complete machine display with relevant self-checking result.
In an embodiment of the present invention, as another optional embodiment, after the starting the engine, before obtaining the required power of the load, the method further includes:
acquiring the current electric quantity of the capacitor battery, and judging whether the current electric quantity is smaller than the maximum threshold electric quantity:
and if the current electric quantity is smaller than the maximum threshold electric quantity, charging the capacitor battery.
The embodiment of the utility model provides an in, the engine starts the back, can charge to electric capacity battery, and in this charging process, the electronic component that does not allow to set up in advance makes, does not allow the equipment action, and the completion back or the driver of charging select mode, and feedback electric power system can loaded signal, and this process can be indicateed in the complete machine display.
The embodiment of the utility model provides an in, after the driver selects the mode, terminate the charging process of electric capacity battery.
In the embodiment of the present invention, as an optional embodiment, the method further includes:
and determining that the slewing braking energy recovery exists in the working process of the hybrid excavator, monitoring that the working device is in a working state and the slewing motor is in a non-working state, and closing the enabling of the slewing motor.
The embodiment of the utility model provides an in, at the normal loading in-process of hybrid excavator, there is gyration braking energy to retrieve. If the working device works but the rotary motor does not work, the rotary motor is enabled to be closed, so that the rotary motor is in a free rotation state, and the rotary motor, the rotary speed changer, the rotary device and the like are prevented from being damaged.
The embodiment of the utility model provides an in, as an optional embodiment, when the hybrid excavator is out of work for a long time, can shut down engine and main pump motor to reduce energy loss, realize energy-conservation.
In the embodiment of the present invention, as an optional embodiment, the method further includes:
after a shutdown request is received, acquiring the current electric quantity of the capacitor battery, and judging whether the current electric quantity is greater than the safety threshold electric quantity:
if the current electric quantity is larger than the maximum threshold electric quantity, indicating the capacitor battery to drive the engine through the generator/motor to consume energy until the current electric quantity of the capacitor battery is not larger than the safety threshold electric quantity;
and after the current electric quantity of the capacitor battery is not greater than the safety threshold electric quantity, controlling the engine to stop running, delaying preset delay time, storing running data, and powering off the hybrid excavator after the data is stored.
The embodiment of the utility model provides an in, when hybrid excavator needs to shut down, the accessible driver launches the shut down request, at the in-process of shutting down, carry out electric power system discharge strategy earlier, the complete machine controller sends to electric power system and shuts down and discharge the instruction, electric power system receives and shuts down and discharge after the instruction, if electric capacity battery's current electric quantity is greater than the safe threshold value electric quantity, carry out the discharge strategy, electric capacity battery drive generator/motor drags the engine acceleration, reach the purpose of the electric energy of quick consumption electric power system storage, after electric capacity battery's current electric quantity reaches the safe threshold value electric quantity, electric power system feedback discharge is accomplished, control engine stall, after the delay a period, after preserving the operation data, the hybrid excavator outage.
As shown in fig. 3, an embodiment of the present application provides a computer device 300 for executing the power control method for a hybrid excavator in fig. 1, the device including a memory 301, a processor 302 and a computer program stored in the memory 301 and executable on the processor 302, wherein the processor 302 implements the steps of the power control method for a hybrid excavator when executing the computer program.
Specifically, the memory 301 and the processor 302 may be general-purpose memories and processors, and are not particularly limited thereto, and the power control method for the hybrid excavator may be performed when the processor 302 executes a computer program stored in the memory 301.
Corresponding to the power control method for the hybrid excavator in fig. 2, an embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to perform the steps of the power control method for the hybrid excavator.
Specifically, the storage medium can be a general-purpose storage medium such as a portable magnetic disk, a hard disk, or the like, and the computer program on the storage medium, when executed, can execute the above-described power control method for the hybrid shovel.
In the embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. The above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and there may be other divisions in actual implementation, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of systems or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A power control device for a hybrid excavator, comprising: a power generation unit, a main pump electric drive unit and an electric energy storage unit, wherein,
the power generation unit includes: an engine controller, a complete machine controller, an engine, a generator/motor, a first inverter, a communication bus and a direct current bus, wherein,
the whole machine controller is connected with a communication bus, one end of the engine controller is connected with the communication bus, the other end of the engine controller is connected with one end of the engine, the other end of the engine is connected with one end of the generator/motor, the other end of the generator/motor is connected with one end of a first inverter, and the other end of the first inverter is connected with a direct current bus;
a main pump electric drive unit comprising: a second inverter, a motor, a traveling device, and a working device, wherein,
one end of the second inverter is connected with the direct-current bus, the other end of the second inverter is connected with one end of the motor, and the other end of the motor is respectively connected with the traveling device and the working device;
a power storage unit comprising: a capacitor battery, and a dc-dc rectifier, wherein,
the capacitor battery is connected with one end of the direct current-direct current rectifier, and the other end of the direct current-direct current rectifier is connected to the direct current bus.
2. The power control apparatus according to claim 1, characterized in that the power generation unit further comprises:
and one end of the first coupling is connected with the other end of the engine, and the other end of the first coupling is connected with one end of the generator/motor.
3. The power control apparatus according to claim 1, characterized in that the main pump electric drive unit further comprises: a second coupling, a hydraulic main pump, a hydraulic main valve, a walking motor and a hydraulic oil cylinder, wherein,
one end of the second coupler is connected with the other end of the motor, the other end of the second coupler is connected with one end of the hydraulic main pump, the other end of the hydraulic main pump is connected with one end of the hydraulic main valve, the other end of the hydraulic main valve is connected with one end of the traveling motor and one end of the hydraulic oil cylinder respectively, the other end of the traveling motor is connected with the traveling device, and the other end of the hydraulic oil cylinder is connected with the working device.
4. The power control apparatus according to claim 1, characterized in that the electric power storage unit further comprises:
and one end of the inductor is connected with the capacitor battery, and the other end of the inductor is connected with one end of the direct current-direct current rectifier.
5. The power control device according to claim 1, wherein the dc-dc rectifier is further configured to be connected to a communication bus, receive a charging command output by the complete machine controller, and perform rectification conversion on the dc voltage obtained from the dc bus to charge the capacitor battery.
6. The power control device according to claim 1, wherein the first inverter is further configured to be connected to a communication bus, receive a power generation command output by the complete machine controller, switch a current normal operation mode to a power consumption mode, and perform ac conversion on the dc voltage obtained from the dc bus to output ac power to drive the generator/motor to convert the ac power into mechanical power, thereby driving the engine to operate.
7. The power control apparatus according to any one of claims 1 to 6, characterized by further comprising:
a swing electric drive unit comprising: a third inverter, a rotary motor, a rotary reducer, a rotary device and a rotary brake, wherein,
one end of the third inverter is connected with the direct-current bus, the other end of the third inverter is connected with one end of the rotary motor, the other end of the rotary motor is respectively connected with one end of the rotary speed reducer and the rotary brake, and the other end of the rotary speed reducer is connected with the rotary device.
8. The power control apparatus according to claim 7, characterized by further comprising:
and the whole machine display is connected with the communication bus and is used for displaying the instruction output by the whole machine controller and the current running states of the engine, the capacitor battery, the walking device, the working device and the rotary motor.
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| CN202022048302.XU CN212654343U (en) | 2020-09-17 | 2020-09-17 | Power control device for hybrid excavator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111959485A (en) * | 2020-09-17 | 2020-11-20 | 山东临工工程机械有限公司 | Power control method and device for hybrid excavator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111959485A (en) * | 2020-09-17 | 2020-11-20 | 山东临工工程机械有限公司 | Power control method and device for hybrid excavator |
| CN111959485B (en) * | 2020-09-17 | 2024-04-05 | 山东临工工程机械有限公司 | Power control method and device for hybrid excavator |
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