CN111576513A

CN111576513A - Land leveler flow control system, method, controller and land leveler

Info

Publication number: CN111576513A
Application number: CN202010446331.3A
Authority: CN
Inventors: 赵斌; 邢红兵; 侯志强; 梁帮修
Original assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Current assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-08-25
Anticipated expiration: 2040-05-25
Also published as: CN111576513B

Abstract

The disclosure discloses a grader flow control system, a grader flow control method, a grader controller and a grader, and relates to a grader hydraulic system. The system comprises: an oil tank; an operating device; the multi-way valve comprises a plurality of actuating mechanisms, a multi-way valve, a first electric control pump and a controller, wherein each oil outlet of the multi-way valve is connected with the corresponding actuating mechanism; an oil outlet of the first electric control pump is connected with an oil inlet of the multi-way valve, and an oil return port of the multi-way valve and an oil suction port of the first electric control pump are respectively connected with an oil tank; the first end of the controller is connected with the signal end of the first electric control pump, the second end of the controller is connected with each signal end of the multi-way valve, the third end of the controller is connected with the operation device, and the controller is configured to control the outlet flow of the first electric control pump and control the on-off and opening size of the main valve core of the multi-way valve according to the total flow required by the executing mechanism which executes work in the executing mechanisms. The load pressure does not need to be fed back to the oil way of the variable pump after the main valve core is opened, so that the response time of the system is reduced.

Description

Land leveler flow control system, method, controller and land leveler

Technical Field

The present disclosure relates to grader hydraulic systems, and more particularly, to a grader flow control system, method, controller, and grader.

Background

The land leveler is an earthwork machine, which is mainly used for leveling large-area ground such as roads, airports, farmlands and the like, ditching, slope scraping, soil loosening, snow removing and other operations, and the operations, steering, braking, heat dissipation and the like are all realized through a hydraulic system, and the hydraulic system of the land leveler is mostly in the form of a gear pump and a manual throttle valve at present and also in the form of a plunger pump and a hydraulic control load sensitive multi-way valve.

The gear pump and the manual throttle valve system have constant output flow and are only related to the rotating speed of the engine. The plunger pump can be a variable pump, the variable pump and a hydraulic control load sensitive multi-way valve system, the highest load pressure signal is selected by a series of shuttle valves and fed back to the variable pump, the pressure difference of all main valves is ensured to be consistent, and the flow coordination of all the main valves is ensured. When the pilot handle is operated, a higher load pressure signal acts on an adjusting mechanism of the pump, so that the angle of a swash plate of the pump is increased, and the displacement is increased; on the contrary, when the valve is guided to return, the displacement of the pump is reduced, the displacement of the pump is changed through the moving opening degree of the main valve core, and the flow is provided as required. When two or more actuators act simultaneously, the highest load pressure signal acts on the pressure compensation valve of the working unit with small load and is fed back to the variable displacement pump, so that the displacement of the main pump is changed, and the flow can be distributed to all units.

Disclosure of Invention

One technical problem to be solved by the present disclosure is to provide a grader flow control system, method, controller and grader, which can improve the system response efficiency.

According to one aspect of the present disclosure, a grader flow control system is provided, including: an oil tank; an operating device; a plurality of actuators; each oil outlet of the multi-way valve is connected with a corresponding execution mechanism, and an oil return port of the multi-way valve is connected with an oil tank; an oil outlet of the first electric control pump is connected with an oil inlet of the multi-way valve, and an oil suction port of the first electric control pump is connected with an oil tank; and the first end of the controller is connected with the signal end of the first electric control pump, the second end of the controller is connected with each signal end of the multi-way valve, and the third end of the controller is connected with the operating device, wherein the controller is configured to control the size of the outlet flow of the first electric control pump and the on-off and opening size of the main valve element of the multi-way valve according to the sum of the flow required by the executing mechanism which executes work in the plurality of executing mechanisms, when the controller is in a first mode, the sum of the flow is determined according to the preset flow corresponding to each executing mechanism in the plurality of executing mechanisms, and when the controller is in a second mode, the sum of the flow is determined according to the stroke of the operating device.

In some embodiments, the grader flow control system further comprises: a steering mechanism; an oil outlet of the steering gear is connected with the steering mechanism, a signal end of the steering gear is connected with a fourth end of the controller, and an oil return port of the steering gear is connected with the oil tank; and a first oil outlet of the steering priority valve is connected with an oil inlet of the steering gear, a second oil outlet of the steering priority valve is connected with an oil inlet of the multi-way valve, and an oil inlet of the steering priority valve is connected with an oil outlet of the first electric control pump, wherein the controller is also configured to control the outlet flow of the first electric control pump according to an electric signal fed back by the steering gear.

In some embodiments, the grader flow control system further comprises: a heat dissipation system; the first oil outlet of the control valve block is connected with the heat dissipation system, the signal end of the control valve block is connected with the fifth end of the controller, and the oil return port of the control valve block is connected with the oil tank; and the oil outlet of the second pump is connected with the oil inlet of the control valve block, the signal end of the second pump is connected with the sixth end of the controller, and the oil suction port of the second pump is connected with the oil tank, wherein the controller is also configured to control the outlet flow of the second pump according to the electric signal returned by the control valve block.

In some embodiments, the grader flow control system further comprises: and the brake system is connected with the second oil outlet of the control valve block.

In some embodiments, a braking system comprises: a brake mechanism; an oil outlet of the brake valve is connected with the brake mechanism, an oil inlet of the brake valve is connected with a second oil outlet of the control valve block, and an oil return port of the brake valve is connected with an oil tank; and an accumulator disposed between the brake valve and the brake valve.

In some embodiments, the grader flow control system further comprises: the driving end of the power mechanism is connected with the driving end of the first electric control pump, the signal end of the power mechanism is connected with the seventh end of the controller, the first mode or the second mode comprises a heavy-load mode and an energy-saving mode, the controller is configured to send a first rotating speed instruction to the power mechanism in the heavy-load mode, and send a second rotating speed instruction to the power mechanism in the energy-saving mode, wherein the first rotating speed is larger than the second rotating speed.

In some embodiments, the first electronically controlled pump is connected to the second pump.

In some embodiments, the second pump is a variable pump or a gear pump.

In some embodiments, the operator includes a first electrically controlled handle and a second electrically controlled handle.

In some embodiments, the plurality of actuators includes one or more of a left lift cylinder, a right lift cylinder, a ripper cylinder, a blade extraction cylinder, a blade tilt cylinder, a swing motor, a blade swing cylinder, an articulated steering cylinder, a front wheel tilt cylinder, a dozer cylinder.

According to another aspect of the disclosure, a flow control method of the grader flow control system is further provided, which includes: determining the sum of the flow rates required by the actuators for executing work in the plurality of actuators, wherein when the controller is in a first mode, the sum of the flow rates is determined according to the preset flow rate corresponding to each actuator in the plurality of actuators, and when the controller is in a second mode, the sum of the flow rates is determined according to the stroke of the operating device; and controlling the flow of the outlet of the first electric control pump and controlling the on-off and opening size of the main valve element of the multi-way valve according to the flow sum.

In some embodiments, the grader flow control system further comprises: the oil outlet of the steering gear is connected with the steering mechanism, the signal end of the steering gear is connected with the fourth end of the controller, and the oil return port of the steering gear is connected with the oil tank; the first oil outlet of the steering priority valve is connected with an oil inlet of the steering gear, the second oil outlet of the steering priority valve is connected with an oil inlet of the multi-way valve, and an oil inlet of the steering priority valve is connected with an oil outlet of the first electric control pump, wherein the flow control method further comprises the following steps: and controlling the outlet flow of the first electric control pump according to the electric signal fed back by the steering gear.

In some embodiments, the grader flow control system further comprises: the first oil outlet of the control valve block is connected with the heat dissipation system, the signal end of the control valve block is connected with the fifth end of the controller, and the oil return port of the control valve block is connected with the oil tank; an oil outlet of the second pump is connected with an oil inlet of the control valve block, a signal end of the second pump is connected with a sixth end of the controller, and an oil suction port of the second pump is connected with the oil tank, wherein the flow control method further comprises the following steps: and controlling the outlet flow of the second pump according to the electric signal returned by the control valve block.

In some embodiments, the flow control system of the grader further comprises a power mechanism, a driving end of the power mechanism is connected with a driving end of the first electrically-controlled pump, and a signal end of the power mechanism is connected with a seventh end of the controller, wherein the first mode or the plurality of pairs of second modes include a heavy-load mode and an energy-saving mode, and the flow control method further comprises: in a heavy load mode, sending a first rotating speed instruction to a power mechanism; and sending a second rotating speed instruction to the power mechanism in the energy-saving mode, wherein the first rotating speed is greater than the second rotating speed.

According to another aspect of the present disclosure, there is also provided a controller, including: a memory; and a processor coupled to the memory, the processor configured to perform the flow control method as described above based on instructions stored in the memory.

According to another aspect of the present disclosure, there is also provided a controller for a grader flow control system, comprising: the flow determining unit is configured to determine the sum of the flow required by the actuators which execute work in the plurality of actuators, wherein when the controller is in a first mode, the sum of the flow is determined according to the preset flow corresponding to each actuator in the plurality of actuators, and when the controller is in a second mode, the sum of the flow is determined according to the stroke of the operating device; a first electrically controlled pump control unit configured to control a magnitude of an outlet flow rate of the first electrically controlled pump according to a flow rate sum; and the multi-way valve control unit is configured to control the on-off and opening size of a main valve core of the multi-way valve according to the flow sum.

According to another aspect of the present disclosure, there is also provided a grader, including: the grader flow control system described above; or the controller described above.

According to another aspect of the present disclosure, a non-transitory computer-readable storage medium is also presented, having stored thereon computer program instructions, which when executed by a processor, implement the flow control method described above.

In the embodiment of the disclosure, by arranging the oil tank, the operating device, the plurality of executing mechanisms, the multi-way valve, the first electric control pump and the controller and limiting the connection relation of all the components, the controller controls the outlet flow of the first electric control pump according to the flow sum required by the executing mechanisms executing work in the plurality of executing mechanisms, and controls the on-off and opening size of the main valve core of the multi-way valve, so that the electric control positive flow control of the land leveler is realized. The load pressure does not need to be fed back to the oil way of the variable displacement pump after the main valve core is opened, so that the response time of the system is shortened, and the response efficiency of the system is improved. In addition, the controller is set to be in the first mode and the second mode, so that the first electric control pump and the multi-way valve can be controlled simultaneously through the operating device, intelligent remote operation can be realized, and the operation difficulty of an operator is reduced.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a schematic block diagram of some embodiments of a grader flow control system according to the present disclosure.

FIG. 2 is a schematic block diagram of additional embodiments of a grader flow control system according to the present disclosure.

Fig. 3 is a flow diagram of some embodiments of a grader flow control method of the present disclosure.

Fig. 4 is a schematic structural diagram of some embodiments of a controller of the present disclosure.

Fig. 5 is a schematic structural diagram of other embodiments of the controller of the present disclosure.

Fig. 6 is a schematic structural diagram of other embodiments of the controller of the present disclosure.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

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, further discussion thereof is not required in subsequent figures.

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

According to the scheme of the gear pump and the manual throttle valve system, a large amount of oil circulates in the system, power loss is large in the working process, when the flow demand is small, the oil is still output at enough flow, and energy waste is serious. Meanwhile, a large amount of hydraulic oil circulates in the pipeline, and the service life is shortened. Each actuator is greatly affected by the load and cannot perform compound actions.

Compared with a throttling system, the gear pump and manual throttling valve system has the characteristics of power saving, less heat generation and good controllability, and the problem of compound action is well solved. However, when the system normally works, the main valve core needs to be opened first, the highest load pressure signal is selected, and the load pressure signal is fed back to the variable displacement pump, so that the problem of system response delay is caused, the system responsiveness is affected, in the working process, if the load sudden change occurs, an executing mechanism can shake, the control of the system by a hydraulic control mode is not flexible and convenient, and the load sensitive multi-way valve is complex in structure and high in failure rate.

Along with the increasing requirements of people on intellectualization, comfort, controllability and energy conservation, the land scraper also needs to seek a system which is more intelligent, efficient, stable and flexible to control, the problem of energy conservation becomes a social problem, and the improvement of the effective power of a hydraulic system of the land scraper becomes a current important task.

Fig. 1 is a schematic block diagram of some embodiments of a grader flow control system according to the present disclosure. The system comprises an oil tank 1, an operating device 2, a plurality of actuators 3, a multi-way valve 4, a first electrically controlled pump 5 and a controller 6.

The operating device 2 is, for example, an electric control handle, and for convenience of operation, as shown in fig. 2, the operating device 2 includes a first electric control handle 2.1 and a second electric control handle 2.2. The operating device 2 can realize control with multiple degrees of freedom, for example, a front-back motion controls one executing mechanism, a left-right motion controls the other executing mechanism, and the like, and meanwhile, a roller, a button and the like are integrated in the electric control handle to realize control of multiple executing mechanisms. The electric control handle can output electric signals, the electric control handle is small in operating force, quick in response, flexible in operation, more efficient and stable, and the comfort is superior to that of a hydraulic pilot handle.

As shown in fig. 2, the actuator 3 includes, for example, a left lift cylinder 3.1, a right lift cylinder 3.2, a ripper cylinder 3.3, a blade leading cylinder 3.4, a blade tilting cylinder 3.5, a swing motor 3.6, a blade swinging cylinder 3.7, a hinge steering cylinder 3.8, a front wheel tilting cylinder 3.9, a dozer blade cylinder 3.10, and the like.

The multiplex valve 4 is, for example, an electric proportional multiplex valve, and has an internal pilot function, and the pilot end has a proportional solenoid. Each oil outlet of the multi-way valve 4 is connected with a corresponding execution mechanism, and an oil return port of the multi-way valve 4 is connected with the oil tank 1. Compared with a load sensitive multi-way valve, the electric proportional multi-way valve adopted in the embodiment has the advantages of simple structure and low failure rate.

An oil outlet of the first electric control pump 5 is connected with an oil inlet of the multi-way valve 4, and an oil suction port of the first electric control pump 5 is connected with the oil tank 1. The first electronically controlled pump 5 is a variable displacement pump, for example an electronically controlled plunger pump.

A first end of the controller 6 is connected with a signal end of the first electrically controlled pump 5. A second end of the controller 6 is connected to each signal end of the multiplex valve 4, for example to the telecommunications end of the respective pilot proportional solenoid of the electrically proportional multiplex valve. The third end of the controller 6 is connected with the operating device 2, and the operating device 2 can send signals to each electromagnet signal end of the multi-way valve 4 through the controller 6.

In some embodiments, the controller 6 may be connected to the signal terminal of the first electrically controlled pump 5, each signal terminal of the multi-way valve 4 and the operation device 2 through a wire harness connection, a CAN bus connection, a wireless connection, and the like.

The controller 6 is configured to control the magnitude of the outlet flow of the first electrically controlled pump 5 and the on-off and opening size of the main spool of the multi-way valve 4 according to the sum of the flow rates required by the actuators performing work among the plurality of actuators. When the controller 6 is in the first mode, the total flow rate is determined according to the preset flow rate corresponding to each actuator of the plurality of actuators, and when the controller is in the second mode, the total flow rate is determined according to the stroke of the operating device.

The first mode is, for example, a smart mode. In this embodiment, the work of the grader is remotely controlled by the controller program based on the work conditions of the grader. For example, the flow rate required by each execution mechanism during operation is preset, after the land scraper runs to a certain place, the operation required to be executed is determined, the execution mechanism required to input hydraulic oil is further determined, according to the sum of the flow rates required by the execution mechanisms for executing operation, the controller simultaneously sends a command to the first electric control pump and the multi-way valve, and the first electric control pump and the multi-way valve simultaneously act to enable the execution mechanisms to realize the coordinated motion degree. For example, when a grader is working on a grade, it is necessary to rotate the grader blade through a certain angle, and when the grade is steep, it is also required that the blade be placed vertically, which is highly demanding for the operator if only two handles are operated. Under the condition, the first electric control pump and the multi-way valve are controlled to act simultaneously in an intelligent mode through the controller, the operation of an electric control handle is not needed in the process, the requirement on an operator is reduced, and the intelligent operation degree of the grader is improved.

The second mode is, for example, a non-smart mode. In the embodiment, when the electric control handle is operated, the electric control handle outputs a current signal to the controller, and the controller simultaneously transmits the current signal to the proportional electromagnets of the first electric control pump and the multi-way valve, so that the first electric control pump and the multi-way valve act simultaneously. For example, according to the stroke of the electric control handle, the controller calculates the stroke of a main valve core which needs to push the multi-way valve, calculates the sum of the flow rates required by all the working mechanisms, and simultaneously, feeds back the signals output by the controller to the proportional valve which controls the swash plate swing angle of the first electric control pump, so that the multi-way valve provides corresponding flow rates to the corresponding actuating mechanism.

In the above embodiment, by providing the oil tank, the operating device, the plurality of actuators, the multi-way valve, the first electrically controlled pump, the controller and limiting the connection relationship of the components, the controller controls the magnitude of the outlet flow of the first electrically controlled pump according to the sum of the flow rates required by the actuators executing work in the plurality of actuators, and controls the on-off and opening of the main valve element of the multi-way valve, thereby realizing the electrically controlled positive flow control of the grader. The load pressure is not required to be fed back to the oil way of the variable displacement pump after the main valve core is opened, so that the response time of the system is shortened, and the response efficiency of the system is improved. Because the grader adopts the electric control positive flow control, the mechanism cannot shake when the load suddenly changes.

In addition, the controller is set to be in the first mode and the second mode, so that the first electric control pump and the multi-way valve can be controlled simultaneously through the operating device, intelligent remote operation can be realized, and the operation difficulty of an operator is reduced.

In other embodiments of the present disclosure, as shown in fig. 2, the system further comprises a power mechanism 7, such as a generator. The driving end of the power mechanism is connected with the driving end of the first electric control pump 5, and the signal end is connected with the seventh end of the controller 6.

In some embodiments, the first mode or the second mode includes a heavy load mode and a power saving mode, and the controller 6 is configured to send a first speed command to the power mechanism 7 in the heavy load mode and send a second speed command to the power mechanism 7 in the power saving mode, wherein the first speed is greater than the second speed.

For example, when heavy-load working conditions such as on-load rotation, on-load adjustment of a scraper knife and the like occur in a land leveler, the rotating speed of an engine is increased, and the opening degree of a valve rod of the multi-way valve and the swing angle of a swash plate of a variable pump are controlled, so that the execution mechanism realizes coordinated motion, the control precision of the system is improved, the energy consumption is reduced, and the impact is reduced. When the land leveler operates under ordinary working conditions such as ground leveling and the like or under micro-operation working conditions, the rotating speed of the engine is reduced, the maximum value of the current is limited, the flow is provided as required, the energy consumption is reduced, and the delay and waste of the flow cannot be caused.

The land leveler in the embodiment has multiple operation modes, the controller sends a control command to the corresponding part to control the swing angle of the variable pump, so that the variable pump provides an oil source according to the command, and the intelligent, comfortable, controllable and energy-saving improvement of the land leveler is supported.

In other embodiments of the present disclosure, as shown in fig. 2, the system further includes a steering mechanism 8, a diverter 9, and a steering priority valve 10. The steering mechanism 8 is a steering oil cylinder, the steering gear 9 is an electro-hydraulic steering gear for example, and a reversing valve is arranged in the steering mechanism.

An oil outlet of the steering gear 9 is connected with the steering mechanism 8, and flow control of the steering mechanism 8 is realized. The signal end of the steering gear 9 is connected with the fourth end of the controller 6, and the oil return port of the steering gear 9 is connected with the oil tank 1.

A first oil outlet of the steering priority valve 10 is connected with an oil inlet of a steering gear 9, a second oil outlet of the steering priority valve 10 is connected with an oil inlet of the multi-way valve 4, and an oil inlet of the steering priority valve 10 is connected with an oil outlet of the first electric control pump 5. I.e. the steering priority valve 10 is arranged between the multiplex valve 4 and the first electronically controlled pump 5. The steering priority valve 10 is arranged to ensure that the steering action is priority, and when the vehicle needs to steer, the hydraulic oil output by the first electronic control pump 5 enters the reversing valve of the steering gear 9 preferentially through the steering priority valve 10; when the vehicle does not need steering, the controller 6 transmits the flow signal to the first electric control pump 5 and the multi-way valve 4 at the same time, so that the operation is realized.

The controller 6 is also configured to control the magnitude of the outlet flow of the first electronically controlled pump 5 in accordance with the electrical signal fed back by the diverter 9.

In the embodiment, the steering priority valve is arranged, when the steering operation is performed, the steering priority valve preferentially supplies oil to the steering gear, the steering operation is prior to the action of the rest of the actuating mechanisms, and the danger of the vehicle is avoided. The controller can control the outlet flow of the first electric control pump and the opening size of a steering valve in the steering gear according to an electric signal fed back by the steering gear and the steering requirement of a vehicle, so that the electric control positive flow control of the steering system is realized, the operation is flexible, the efficiency is higher and the stability is higher, the response is fast, and the energy is saved.

In other embodiments of the present disclosure, the system further includes a heat dissipation system 11, a control valve block 12, and a second pump 13.

A first outlet of the control valve block 12 is connected to the heat dissipation system 11, and in some embodiments, the heat dissipation system 11 is, for example, a hydraulic fan, and an outlet of the hydraulic fan is connected to the oil tank 1. The signal end of the control valve block 12 is connected with the fifth end of the controller 6, and the hydraulic oil signal in the control valve block 12 is converted into a current signal through a sensor and output. The return port of the control valve block 12 is connected to the oil tank 1.

The second pump 13 is, for example, a variable displacement pump, for example, a plunger pump, an oil outlet of the second pump 13 is connected to an oil inlet of the control valve block 12, a signal end of the second pump 13 is connected to a sixth end of the controller 6, and an oil suction port of the second pump 13 is connected to the oil tank 1. The controller 6 is also configured to control the magnitude of the outlet flow of the second pump 13 in response to the electrical signal returned by the control valve block 12.

In this embodiment, through setting up independent cooling system, can solve the unstable problem of leveler hydraulic system temperature control, realize the accurate control of temperature.

In some embodiments, the second pump 13 may also be a gear pump. When the second pump 13 is a gear pump, system cost can be saved.

In some embodiments, the first electronically controlled pump 5 and the second pump 13 are coupled and powered by a motive mechanism.

In other embodiments of the present disclosure, the system may further include a brake system 14, and the brake system 14 is connected to the second oil outlet of the control valve block 11. The control valve block 11 is an electric proportional brake/heat dissipation control valve block.

The braking system includes a braking mechanism 141, a brake valve 142, and an accumulator 143. The brake mechanism 141 is, for example, a brake cylinder.

An oil outlet of the brake valve 142 is connected with the brake mechanism 141, an oil inlet of the brake valve 142 is connected with a second oil outlet of the control valve block 11, and an oil return port of the brake valve 143 is connected with the oil tank 1. The accumulator 143 is disposed between the brake valve 141 and the brake valve 142.

When the controller is driven, the oil pressure in the accumulator 143 enters the brake mechanism 141 through the brake valve 142, and the braking function is realized. When the pressure of the oil in the accumulator 143 is lower than the pressure set by the control valve block 11, the oil of the second pump 13 charges the accumulator 143 through the control valve block 11 until the pressure reaches the set value of the accumulator 143.

In the embodiment, the energy accumulator is arranged, when the oil pressure in the energy accumulator meets the condition, the oil is supplied to the braking mechanism by the energy accumulator, and the braking system and the heat dissipation system share the control valve block, so that the system cost is reduced.

In step 310, the sum of the flow rates required by the actuators to perform work among the plurality of actuators is determined, wherein the sum of the flow rates is determined according to the preset flow rate corresponding to each actuator among the plurality of actuators when the controller is in the first mode, and the sum of the flow rates is determined according to the stroke of the operating device when the controller is in the second mode.

In step 320, the flow rate of the outlet of the first electric control pump is controlled according to the flow rate sum, and the on-off and opening size of the main valve core of the multi-way valve are controlled.

In some embodiments, the first mode or the second mode includes a heavy load mode and a power saving mode. And in the heavy-load mode, sending a first rotating speed instruction to a power mechanism of the controller, and in the energy-saving mode, sending a second rotating speed instruction to the power mechanism by the controller, wherein the first rotating speed is greater than the second rotating speed.

In the above embodiment, the controller controls the magnitude of the outlet flow of the first electrically controlled pump and controls the on-off and opening of the main valve element of the multi-way valve according to the sum of the flow rates required by the actuators executing work in the plurality of actuators, thereby realizing the electrically controlled positive flow control of the grader. The load pressure does not need to be fed back to the oil way of the variable pump after the main valve core is opened, so that the response time of the system is reduced. In addition, the controller is set to be in the first mode and the second mode, so that the first electric control pump and the multi-way valve can be controlled simultaneously through the operating device, intelligent remote operation can be realized, and the operation difficulty of an operator is reduced.

In other embodiments of the disclosure, the controller may further control the magnitude of the outlet flow of the first electronic control pump according to an electric signal fed back by the steering device, so as to implement steering control of the grader.

In other embodiments of the present disclosure, the controller may also control the magnitude of the outlet flow of the second pump based on an electrical signal returned by the control valve block. When the control valve block controls the heat dissipation system, the problem of unstable temperature control of the hydraulic system of the land leveler is solved, and accurate temperature control is realized.

Fig. 4 is a schematic structural diagram of some embodiments of a controller of the present disclosure. The controller includes a memory 410 and a processor 420. Wherein: the memory 410 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory 410 is used for storing instructions in the embodiment corresponding to fig. 3. Processor 420 is coupled to memory 410 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 420 is configured to execute instructions stored in memory.

In other embodiments of the present disclosure, processor 420 is coupled to memory 410 through a BUS BUS 430. The controller 400 may also be coupled to an external storage device 450 via a storage interface 440 for accessing external data, and may also be coupled to a network or another computer system (not shown) via a network interface 460, which will not be described in detail herein.

In the embodiment, the data instruction is stored in the memory, and the instruction is processed by the processor, so that the electric control positive flow control of the grader is realized. The load pressure does not need to be fed back to the oil way of the variable pump after the main valve core is opened, so that the response time of the system is reduced.

Fig. 5 is a schematic structural diagram of other embodiments of the controller of the present disclosure. The controller includes a flow determination unit 510, a first electronically controlled pump control unit 520, and a multiplex valve control unit 530.

The flow rate determining unit 510 is configured to determine a sum of flow rates required by actuators of the plurality of actuators to perform work, wherein the sum of flow rates is determined according to a preset flow rate corresponding to each of the plurality of actuators when the controller is in the first mode, and the sum of flow rates is determined according to a stroke of the operating device when the controller is in the second mode.

In some embodiments, the flow rate determination unit 510 is further configured to determine the flow rate required by the steering mechanism according to the electric signal fed back by the steering gear.

In some embodiments, the flow determination unit 510 is further configured to determine the amount of flow required by the braking system or the heat dissipation system based on the electrical signal returned by the control valve block.

The first electronically controlled pump control unit 520 is configured to control the magnitude of the outlet flow of the first electronically controlled pump based on the sum of the flow rates required by the actuators performing work from among the plurality of actuators.

The multi-way valve control unit 530 is configured to control the on/off and the opening size of the main spool of the multi-way valve according to the sum of the flow rates required by the actuators performing work among the plurality of actuators.

In some embodiments, as shown in fig. 6, the controller further includes a power mechanism control unit 540 configured to send a speed command to the power mechanism. For example, in the heavy load mode, a first rotation speed command is sent to the power mechanism, and in the energy saving mode, a second rotation speed command is sent to the power mechanism, wherein the first rotation speed is greater than the second rotation speed.

In some embodiments, as shown in fig. 6, the controller further includes a brake control unit 550 configured to control the opening and closing of the directional valve of the steering gear and the size of the opening.

A second pump control unit 560 and a control valve block control unit 570. The second pump control unit 560 is configured to control the magnitude of the outlet flow of the second pump. The control valve block control unit 570 is configured to control the on/off and opening size of the control valve block.

In other embodiments of the disclosure, a grader is protected that includes a grader flow control system as described above, or alternatively, the grader includes a controller as described above.

In other embodiments, a computer-readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of the embodiment corresponding to fig. 3. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A grader flow control system comprising:

an oil tank;

an operating device;

a plurality of actuators;

each oil outlet of the multi-way valve is connected with a corresponding execution mechanism, and an oil return port of the multi-way valve is connected with the oil tank;

an oil outlet of the first electric control pump is connected with an oil inlet of the multi-way valve, and an oil suction port of the first electric control pump is connected with the oil tank; and

and a controller, a first end of which is connected with a signal end of the first electric control pump, a second end of which is connected with each signal end of the multi-way valve, and a third end of which is connected with the operating device, wherein the controller is configured to control the magnitude of the outlet flow of the first electric control pump and the on-off and opening of a main valve core of the multi-way valve according to the sum of the flow required by the executing mechanisms executing work in the executing mechanisms, wherein when the controller is in a first mode, the sum of the flow is determined according to the preset flow corresponding to each executing mechanism in the executing mechanisms, and when the controller is in a second mode, the sum of the flow is determined according to the stroke of the operating device.

2. The grader flow control system of claim 1 further comprising:

a steering mechanism;

an oil outlet of the steering gear is connected with the steering mechanism, a signal end of the steering gear is connected with a fourth end of the controller, and an oil return port of the steering gear is connected with the oil tank; and

a first oil outlet of the steering priority valve is connected with an oil inlet of the steering gear, a second oil outlet of the steering priority valve is connected with an oil inlet of the multi-way valve, an oil inlet of the steering priority valve is connected with an oil outlet of the first electric control pump,

wherein the controller is further configured to control the magnitude of the outlet flow of the first electrically controlled pump based on the electrical signal fed back by the diverter.

3. The grader flow control system of claim 1 or 2, further comprising:

a heat dissipation system;

a first oil outlet of the control valve block is connected with the heat dissipation system, a signal end of the control valve block is connected with a fifth end of the controller, and an oil return port of the control valve block is connected with the oil tank; and

an oil outlet of the second pump is connected with an oil inlet of the control valve block, a signal end of the second pump is connected with a sixth end of the controller, an oil suction port of the second pump is connected with the oil tank,

wherein the controller is further configured to control the magnitude of the outlet flow of the second pump based on the electrical signal returned by the control valve block.

4. The grader flow control system of claim 3 further comprising:

and the brake system is connected with the second oil outlet of the control valve block.

5. The grader flow control system of claim 4 wherein the braking system comprises:

a brake mechanism;

an oil outlet of the brake valve is connected with the brake mechanism, an oil inlet of the brake valve is connected with a second oil outlet of the control valve block, and an oil return port of the brake valve is connected with the oil tank; and

an accumulator disposed between the brake valve and the brake valve.

6. The grader flow control system of claim 1 further comprising:

a driving end of the power mechanism is connected with the driving end of the first electric control pump, a signal end is connected with a seventh end of the controller,

the controller is configured to send a first rotating speed instruction to the power mechanism in the heavy load mode and send a second rotating speed instruction to the power mechanism in the energy saving mode, wherein the first rotating speed is greater than the second rotating speed.

7. The grader flow control system of claim 3 wherein,

the first electrically controlled pump is connected with the second pump.

8. The grader flow control system of claim 3 wherein,

the second pump is a variable pump or a gear pump.

9. The grader flow control system of claim 1 or 2,

the operating device comprises a first electric control handle and a second electric control handle.

10. The grader flow control system of claim 1 or 2,

the plurality of actuating mechanisms comprise one or more of a left lifting oil cylinder, a right lifting oil cylinder, a scarifier oil cylinder, a scraper leading-out oil cylinder, a scraper inclined oil cylinder, a rotary motor, a scraper swinging oil cylinder, a hinged steering oil cylinder, a front wheel inclined oil cylinder and a dozer oil cylinder.

11. A flow control method of a grader flow control system in accordance with claim 1, comprising:

determining the sum of flow rates required by executing mechanisms for executing work in the multiple executing mechanisms, wherein when the controller is in a first mode, the sum of the flow rates is determined according to the preset flow rate corresponding to each executing mechanism in the multiple executing mechanisms, and when the controller is in a second mode, the sum of the flow rates is determined according to the stroke of the operating device; and

and controlling the flow of the outlet of the first electric control pump and controlling the on-off and opening size of the main valve element of the multi-way valve according to the flow sum.

12. The flow control method of claim 11, wherein the grader flow control system further comprises: the oil outlet of the steering gear is connected with the steering mechanism, the signal end of the steering gear is connected with the fourth end of the controller, and the oil return port of the steering gear is connected with the oil tank; the first oil outlet of the steering priority valve is connected with the oil inlet of the steering gear, the second oil outlet of the steering priority valve is connected with the oil inlet of the multi-way valve, and the oil inlet of the steering priority valve is connected with the oil outlet of the first electric control pump, wherein the flow control method further comprises the following steps:

and controlling the outlet flow of the first electric control pump according to the electric signal fed back by the steering gear.

13. The flow control method according to claim 11 or 12, wherein the grader flow control system further comprises: the first oil outlet of the control valve block is connected with the heat dissipation system, the signal end of the control valve block is connected with the fifth end of the controller, and the oil return port of the control valve block is connected with the oil tank; an oil outlet of the second pump is connected with an oil inlet of the control valve block, a signal end of the second pump is connected with a sixth end of the controller, and an oil suction port of the second pump is connected with the oil tank, wherein the flow control method further comprises the following steps:

and controlling the outlet flow of the second pump according to the electric signal returned by the control valve block.

14. The flow control method of claim 11 or 12, wherein the grader flow control system further comprises a power mechanism having a drive end coupled to the drive end of the first electrically controlled pump and a signal end coupled to a seventh end of the controller, wherein the first mode or pairs of second modes include a heavy load mode and an energy savings mode, the flow control method further comprising:

under the heavy-load mode, a first rotating speed instruction is sent to the power mechanism; and

and sending a second rotating speed instruction to the power mechanism in the energy-saving mode, wherein the first rotating speed is greater than the second rotating speed.

15. A controller, comprising:

a memory; and

a processor coupled to the memory, the processor configured to perform the flow control method of any of claims 11 to 14 based on instructions stored in the memory.

16. A controller for a grader flow control system as in any of claims 1-10 comprising:

the flow determining unit is configured to determine the sum of the flow required by the actuators for executing work in the plurality of actuators, wherein the sum of the flow is determined according to the preset flow corresponding to each actuator in the plurality of actuators when the controller is in a first mode, and the sum of the flow is determined according to the stroke of the operating device when the controller is in a second mode;

a first electrically controlled pump control unit configured to control the magnitude of the outlet flow of the first electrically controlled pump according to the flow sum; and

and the multi-way valve control unit is configured to control the on-off and opening size of a main valve core of the multi-way valve according to the flow sum.

17. A grader, comprising:

the grader flow control system of any of claims 1 to 10; or

The controller of claim 15 or 16.

18. A non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the flow control method of any of claims 11 to 14.