阅读说明：本技术 一种液压系统排气控制方法及装置 (Hydraulic system exhaust control method and device ) 是由 高登峰 李云霞 秦翠萍 申宗 程海 于 2020-12-04 设计创作，主要内容包括：本发明提供的液压系统排气控制方法及装置,应用于液压系统技术领域,该方法在液压系统上电后,获取液压系统中蓄能器的蓄能压力,如果蓄能压力处于预设压力范围内,控制蓄能器安全阀和管路安全阀分别执行N次第一开合动作,以排除储能器以及液压管路中可能存在的空气；并在蓄能器安全阀和管路安全阀执行完N次所述第一开合动作的情况下,控制各执行部件动作阀执行M次第二开合动作,进一步排除各执行部件内存在的空气。本方法通过控制蓄能器安全阀、管路安全阀,以及各执行部件动作阀进行开合动作的方式,首先对液压系统进行排气,从而避免液压系统中混入的空气对液压系统后续的工作过程带来影响,确保液压系统的稳定运行。(The invention provides a hydraulic system exhaust control method and a device, which are applied to the technical field of hydraulic systems, wherein after a hydraulic system is electrified, the method obtains the energy storage pressure of an energy accumulator in the hydraulic system, and if the energy storage pressure is in a preset pressure range, a safety valve of the energy accumulator and a safety valve of a pipeline are controlled to respectively execute N times of first opening and closing actions so as to remove air possibly existing in the energy accumulator and the hydraulic pipeline; and under the condition that the accumulator safety valve and the pipeline safety valve execute the first opening and closing action for N times, controlling each execution component action valve to execute the second opening and closing action for M times, and further removing air existing in each execution component. According to the method, the energy accumulator safety valve, the pipeline safety valve and the action valves of the execution parts are controlled to perform opening and closing actions, the hydraulic system is firstly exhausted, so that the influence of air mixed in the hydraulic system on the subsequent working process of the hydraulic system is avoided, and the stable operation of the hydraulic system is ensured.)

1. A hydraulic system exhaust control method, comprising:

after a hydraulic system is electrified, acquiring the energy storage pressure of an energy accumulator in the hydraulic system;

judging whether the energy storage pressure is in a preset pressure range or not;

if the energy storage pressure is within the preset pressure range, controlling an energy storage safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions, wherein N is more than or equal to 1;

and under the condition that the energy accumulator safety valve and the pipeline safety valve execute the first opening and closing action for N times, controlling each execution component action valve in the hydraulic system to execute second opening and closing actions for M times, wherein M is more than or equal to 1.

2. The hydraulic system bleed control method of claim 1, wherein the first opening and closing action comprises:

the method comprises the steps of keeping the switch-on within a first preset time length, and keeping the switch-off within a second preset time length after the first preset time length is finished.

3. The hydraulic system bleed control method of claim 1, wherein the second opening and closing action comprises:

and keeping the switch-on within a third preset time, and keeping the switch-off within a fourth preset time after the third preset time is ended.

4. The hydraulic system vent control method according to claim 1, wherein if the charging pressure is within the preset pressure range, before the controlling an accumulator relief valve and a line relief valve in the hydraulic system respectively perform N times of first opening and closing actions, the method further comprises:

setting a preset flag bit for indicating that the hydraulic system enters an exhaust control process.

5. The hydraulic system bleed control method of claim 4, wherein after each implement component actuation valve in the hydraulic system performs M second opening and closing actions, the method further comprises:

and resetting the preset zone bit.

6. The hydraulic system vent control method according to any one of claims 1 to 5, wherein the step of obtaining the charging pressure of an accumulator in the hydraulic system is performed in return if the charging pressure is not within the preset pressure range.

7. A hydraulic system exhaust control device, comprising:

the acquisition unit is used for acquiring the energy storage pressure of an energy accumulator in the hydraulic system after the hydraulic system is powered on;

the judging unit is used for judging whether the energy storage pressure is in a preset pressure range or not;

the first control unit is used for controlling an energy accumulator safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions if the energy storage pressure is within the preset pressure range, wherein N is more than or equal to 1;

and the second control unit is used for controlling the action valves of each executing part in the hydraulic system to execute M times of second opening and closing actions under the condition that the energy accumulator safety valve and the pipeline safety valve execute N times of first opening and closing actions, wherein M is more than or equal to 1.

8. The hydraulic system vent control device of claim 7, wherein the first opening and closing action comprises:

the method comprises the steps of keeping the switch-on within a first preset time length, and keeping the switch-off within a second preset time length after the first preset time length is finished.

9. The hydraulic system exhaust control device according to claim 7, wherein the second opening and closing action includes:

and keeping the switch-on within a third preset time, and keeping the switch-off within a fourth preset time after the third preset time is ended.

10. The hydraulic system vent control device of claim 7, further comprising, if the charging pressure is within the predetermined pressure range:

and the setting unit is used for setting a preset flag position for representing that the hydraulic system enters an exhaust control process.

Technical Field

The invention relates to the technical field of hydraulic systems, in particular to an exhaust control method and device for a hydraulic system.

Background

In practical application, the volume of the air inlet control valve and the air outlet control valve of the marine large-cylinder-diameter diesel engine supercharger is large, the torque required to be provided is correspondingly large, and meanwhile, due to the limitation of the arrangement space, the motor is difficult to be used for providing the driving torque, so that in the prior art, the marine large-cylinder-diameter diesel engine supercharger mostly adopts a hydraulic system to drive an actuator to complete corresponding opening and closing actions.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a hydraulic drive system in the prior art, in which an accumulator, a hydraulic oil pump, an accumulator safety valve, a pipeline safety valve, a plurality of actuating component action valves, and corresponding communication pipelines are arranged. In the actual operation of the hydraulic system, air is inevitably mixed in the hydraulic system, so that the hydraulic system is unstable in work, vibration noise is generated, the hydraulic system creeps, and the cylinder is suddenly flushed when being started, and even the hydraulic system cannot work normally in serious conditions.

In view of the above, how to timely discharge air mixed in the hydraulic system and ensure stable operation of the hydraulic system becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention provides a method and a device for controlling exhaust of a hydraulic system.

In order to achieve the purpose, the technical scheme provided by the application is as follows:

in a first aspect, the present invention provides a hydraulic system exhaust control method, including:

after a hydraulic system is electrified, acquiring the energy storage pressure of an energy accumulator in the hydraulic system;

judging whether the energy storage pressure is in a preset pressure range or not;

if the energy storage pressure is within the preset pressure range, controlling an energy storage safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions, wherein N is more than or equal to 1;

and under the condition that the energy accumulator safety valve and the pipeline safety valve execute the first opening and closing action for N times, controlling each execution component action valve in the hydraulic system to execute second opening and closing actions for M times, wherein M is more than or equal to 1.

Optionally, the first opening and closing action includes:

the method comprises the steps of keeping the switch-on within a first preset time length, and keeping the switch-off within a second preset time length after the first preset time length is finished.

Optionally, the second opening and closing action includes:

and keeping the switch-on within a third preset time, and keeping the switch-off within a fourth preset time after the third preset time is ended.

Optionally, if the stored pressure is within the preset pressure range, before the controlling the accumulator safety valve and the pipeline safety valve in the hydraulic system to perform the first opening and closing actions N times, the method further includes:

setting a preset flag bit for indicating that the hydraulic system enters an exhaust control process.

Optionally, after each executing component action valve in the hydraulic system executes M second opening and closing actions, the method further includes:

and resetting the preset zone bit.

Optionally, if the stored pressure is not within the preset pressure range, the step of obtaining the stored pressure of the energy accumulator in the hydraulic system is executed in a return mode.

In a second aspect, the present invention provides a hydraulic system exhaust control apparatus comprising:

the acquisition unit is used for acquiring the energy storage pressure of an energy accumulator in the hydraulic system after the hydraulic system is powered on;

the judging unit is used for judging whether the energy storage pressure is in a preset pressure range or not;

the first control unit is used for controlling an energy accumulator safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions if the energy storage pressure is within the preset pressure range, wherein N is more than or equal to 1;

and the second control unit is used for controlling the action valves of each executing part in the hydraulic system to execute M times of second opening and closing actions under the condition that the energy accumulator safety valve and the pipeline safety valve execute N times of first opening and closing actions, wherein M is more than or equal to 1.

Optionally, the first opening and closing action includes:

the method comprises the steps of keeping the switch-on within a first preset time length, and keeping the switch-off within a second preset time length after the first preset time length is finished.

Optionally, the second opening and closing action includes:

and keeping the switch-on within a third preset time, and keeping the switch-off within a fourth preset time after the third preset time is ended.

Optionally, if the energy storage pressure is within the preset pressure range, the method further includes:

and the setting unit is used for setting a preset flag position for representing that the hydraulic system enters an exhaust control process.

The invention provides a hydraulic system exhaust control method, which comprises the steps of obtaining the energy storage pressure of an energy accumulator in a hydraulic system after the hydraulic system is electrified, and controlling an energy accumulator safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions to remove air possibly existing in the energy accumulator and a hydraulic pipeline if the energy storage pressure is in a preset pressure range; and under the condition that the accumulator safety valve and the pipeline safety valve execute the first opening and closing action for N times, controlling each execution component action valve in the hydraulic system to execute second opening and closing actions for M times, and further removing air existing in each execution component. According to the exhaust control method for the hydraulic system, after the hydraulic system is electrified, the hydraulic system is firstly exhausted by controlling the energy accumulator safety valve, the pipeline safety valve and the action valves of the execution parts to perform opening and closing actions, so that the influence of air mixed in the hydraulic system on the subsequent working process of the hydraulic system is avoided, and the stable operation of the hydraulic system is ensured.

Furthermore, the exhaust control method provided by the invention is realized on the basis of the existing hydraulic system, and the aim of exhausting the air in the hydraulic system can be fulfilled on the premise of not increasing the cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art hydraulic drive system;

FIG. 2 is a flow chart of a method for controlling exhaust of a hydraulic system according to an embodiment of the present disclosure;

FIG. 3 is a flow chart of another method of hydraulic system vent control provided by an embodiment of the present invention;

fig. 4 is a block diagram of a hydraulic system exhaust control device according to an embodiment of the present invention;

fig. 5 is a block diagram of another hydraulic system exhaust control device according to an embodiment of the present invention.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.

The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.

It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.

It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.

In the existing hydraulic system, hydraulic oil is stored in an oil tank, when the hydraulic system is electrified and works, the hydraulic oil in the oil tank is sent into an energy accumulator of the hydraulic system through a hydraulic oil pump, after the hydraulic oil is pressurized by the energy accumulator, the hydraulic oil with certain pressure is sent into each execution component through a circulation pipeline to drive each execution component to act, after that, the hydraulic oil flows back into the oil tank, if air is mixed in the hydraulic oil, the mixed air enters the oil tank along with the hydraulic oil, and finally overflows from the oil tank.

Based on the above basis, an embodiment of the present invention provides a hydraulic system exhaust control method, in which an accumulator safety valve, a pipeline safety valve, and action valves of each execution component in a hydraulic system are controlled to open and close at a pressure building stage of an accumulator of the hydraulic system, so that hydraulic oil of mixed oil air is converged into an oil tank before the hydraulic system is formally operated, and thus, a normal operation process of the hydraulic system is prevented from being affected. The exhaust control method of the hydraulic system provided by the invention is applied to the controller of the hydraulic system, and can be realized by a server on a network side under certain conditions.

Referring to fig. 1, fig. 1 is a flowchart of a hydraulic system exhaust control method according to an embodiment of the present invention, where the flowchart of the method may include:

s100, after the hydraulic system is electrified, the energy storage pressure of an energy accumulator in the hydraulic system is obtained.

As described above, the exhaust control method for the hydraulic system according to the embodiment of the present invention is mainly applied to the pressure establishment stage of the energy accumulator, and after the hydraulic system is powered on, the energy storage pressure of the energy accumulator in the hydraulic system starts to be monitored, and the subsequent steps are executed according to the pressure establishment condition of the energy accumulator, so as to ensure that the exhaust control process of the hydraulic system is completed before the pressure of the energy accumulator reaches the normal working range, and ensure that the exhaust control process of the hydraulic system does not affect the normal working process of the hydraulic system.

It should be noted that, for the specific method for obtaining the stored pressure in the energy accumulator, reference may be made to the prior art, and the present invention is not limited thereto.

And S110, judging whether the energy storage pressure is in a preset pressure range, if so, executing S120, otherwise, returning to execute S100.

As described above, in the exhaust control method for the hydraulic system according to the embodiment of the present invention, the exhaust control is completed before the hydraulic system is actually operated, and therefore, it is conceivable that the preset pressure range mentioned in this step, specifically, the upper limit value of the preset pressure range, should not be greater than the lower limit value of the corresponding operating pressure range when the hydraulic system is actually operated, so as to ensure that the exhaust control process does not affect the normal operation process of the hydraulic system.

It is conceivable that, for setting the preset pressure range of the accumulator, in addition to the above-mentioned relation with the working pressure range of the hydraulic system, the performance of the hydraulic system itself should be taken into account in the specific setting, and if the preset pressure range is selected to be too small, it is possible that air inside the hydraulic system cannot be effectively discharged because the pressure inside the hydraulic system is insufficient.

After the energy storage pressure of the energy accumulator is obtained, further pressing whether the energy storage pressure is in a preset pressure range, if the energy storage pressure is in the preset pressure range, it is indicated that the hydraulic system has established enough pressure for removing air in the hydraulic oil, and S120 can be executed; on the contrary, if the obtained charging pressure is not within the preset pressure range, the process returns to S100 to continue monitoring the charging pressure of the accumulator.

And S120, controlling an accumulator safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions.

Under the condition that the energy storage pressure of the energy accumulator is in a preset pressure range, an energy accumulator safety valve and a pipeline safety valve in the hydraulic system can be controlled to respectively execute N times of first opening and closing actions, wherein N is larger than or equal to 1. Of course, the specific value of N may be selected in combination with the actual performance of the hydraulic system, which is not specifically limited in the present invention.

Optionally, the first opening and closing action described in this embodiment includes keeping opening within a first preset duration, and keeping closing within a second preset duration after the first preset duration ends. In practical application of the hydraulic system, the accumulator safety valve and the pipeline safety valve are both controlled based on the relay, so that when the accumulator safety valve and the pipeline safety valve are in an open state or a closed state, the accumulator safety valve and the pipeline safety valve cannot be immediately switched to another opposite state, and need to be kept for a certain time length, namely, the first preset time length and the second preset time length set in the embodiment. Therefore, for the specific selection of the first preset time and the second preset time, the setting of the action characteristics of the accumulator safety valve and the pipeline safety valve needs to be combined so as to meet the requirement that the two valves can normally act.

Optionally, a counter may be provided, and the number of times of actions of the accumulator safety valve and the pipeline safety valve is counted, and the counter increments by one each time the accumulator safety valve and the pipeline safety valve complete the first opening and closing action once until N times are reached, and the subsequent steps are executed.

As can be seen from the existing structure of the hydraulic system shown in fig. 1, the operation of the accumulator safety valve and the pipeline safety valve is controlled, so that the air in the corresponding pipeline located at the upstream of the accumulator safety valve and the upstream of the pipeline safety valve can be discharged and collected to the oil tank.

S130, judging whether the accumulator safety valve and the pipeline safety valve execute N times of first opening and closing actions, if so, executing S140, and if not, executing S120.

And judging whether the accumulator safety valve and the pipeline safety valve complete N times of first opening and closing actions according to the statistical result of the times of executing the first opening and closing actions on the accumulator safety valve and the pipeline safety valve. And if the times of executing the first opening and closing actions of the accumulator safety valve and the pipeline safety valve are counted in a counter mode, the counting value of the counter can be directly read, when the accumulator safety valve and the pipeline safety valve execute the first opening and closing actions for N times, S140 is executed, otherwise, S130 is returned, and the accumulator safety valve and the pipeline safety valve are continuously controlled to execute the first opening and closing actions.

And S140, controlling each actuating component actuating valve in the hydraulic system to execute M times of second opening and closing actions.

After the actions of the accumulator safety valve and the pipeline safety valve are finished, the action valves of each execution component in the hydraulic system can be controlled to execute M times of second opening and closing actions, wherein M is more than or equal to 1.

Optionally, the second opening and closing action in this embodiment includes: and keeping the switch-on within a third preset time length and keeping the switch-off within a fourth preset time length after the third preset time length is finished. It is conceivable that the action control of the actuator-action valve is also performed based on the relay, and therefore, the reason for setting the third preset period and the fourth preset period and the specific setting manner are the same as those for setting the first preset period and the second preset period, which will not be repeated here.

Similarly, the counting of the number of times of the actuation of the actuator valve may be implemented based on a counter, and the counter is incremented by one each time each actuator valve performs the second opening/closing operation, until each actuator valve performs the second opening/closing operation M times.

The air in each execution component can be effectively discharged by controlling the action of the execution component action valve, and similarly, the air is collected to the oil tank and finally released through the oil tank.

It should be noted that, in the method for controlling exhaust of a hydraulic system according to the embodiment of the present invention, the accumulator safety valve and the pipeline safety valve are controlled to operate first, and then the actuation valves of the respective execution components are controlled to operate, which is mainly to prevent the pressure in the pipeline of the hydraulic system from dropping suddenly when the accumulator safety valve and the pipeline safety valve operate, so that the actuation valves of the respective execution components cannot exhaust effectively, that is, the accumulator safety valve and the pipeline safety valve are controlled to operate first, and after the operation is completed, the accumulator still has enough time to build up pressure, so as to ensure that air in hydraulic oil can be effectively exhausted when the actuation valves of the respective execution components operate.

In summary, according to the exhaust control method for the hydraulic system provided in the embodiment of the present invention, after the hydraulic system is powered on, the hydraulic system is first exhausted by controlling the accumulator safety valve, the pipeline safety valve, and the actuation valves of the respective execution components to perform opening and closing actions, so that the influence of air mixed in the hydraulic system on the subsequent working process of the hydraulic system is avoided, and the stable operation of the hydraulic system is ensured.

Furthermore, the exhaust control method provided by the invention is realized on the basis of the existing hydraulic system, and the aim of exhausting the air in the hydraulic system can be fulfilled on the premise of not increasing the cost.

Optionally, when each valve body in the hydraulic system performs an opening and closing operation, hydraulic oil pressure of the hydraulic system may fluctuate, and in order to ensure smooth proceeding of an exhaust process, an embodiment of the present invention provides another hydraulic system exhaust control method, referring to fig. 3, where fig. 3 is a flowchart of another hydraulic system exhaust control method provided by an embodiment of the present invention, and a flow of the control method may include:

and S200, after the hydraulic system is electrified, acquiring the energy storage pressure of an energy accumulator in the hydraulic system.

Optionally, the execution process of S200 may be implemented by referring to the execution process of S100 in the embodiment shown in fig. 2, and details are not described here.

And S210, judging whether the energy storage pressure is in a preset pressure range, if so, executing S220, otherwise, returning to execute S200.

Optionally, the execution process of S210 may be implemented by referring to the execution process of S110 in the embodiment shown in fig. 2, and details are not described here.

And S220, setting a preset flag position for representing that the hydraulic system enters an exhaust control process.

And after the energy storage pressure is in the preset pressure range, the preset flag bit is set immediately to represent that the hydraulic system enters the exhaust control process, and as long as the preset flag bit is in the set state, the fluctuation of the pipeline pressure in the hydraulic system can be ignored, so that the normal execution of the exhaust control process and the control processes of other hydraulic systems is not influenced.

And S230, controlling an accumulator safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions.

Optionally, the execution process of S230 may be implemented by referring to the execution process of S120 in the embodiment shown in fig. 2, and details are not described here.

And S240, judging whether the accumulator safety valve and the pipeline safety valve execute N times of first opening and closing actions, if so, executing S250, and if not, executing S230.

Optionally, the execution process of S240 may be implemented by referring to the execution process of S130 in the embodiment shown in fig. 2, and details are not described here.

And S250, controlling each actuating component actuating valve in the hydraulic system to execute M times of second opening and closing actions.

Optionally, the execution process of S250 may be implemented by referring to the execution process of S140 in the embodiment shown in fig. 2, and details are not described here.

And S260, resetting the preset flag bit.

After each actuating component actuating valve in the hydraulic system is controlled to execute M times of second opening and closing actions, the preset zone bit can be reset, and the exhaust control process of the hydraulic system is quitted.

In summary, the control method for the hydraulic exhaust system provided in the embodiment of the present invention prevents, by means of the preset flag, the pipeline pressure fluctuation in the exhaust control process from affecting the exhaust control process and other control processes of the hydraulic system, and ensures smooth performance of the exhaust control process.

It is to be noted that the flow charts in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

It should be noted that while the operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous.

It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.

The hydraulic system exhaust control device provided by the embodiment of the present invention is introduced below, and the hydraulic system exhaust control device described below may be regarded as a functional module architecture that needs to be set in a central device to implement the hydraulic system exhaust control method provided by the embodiment of the present invention; the following description may be cross-referenced with the above.

Alternatively, referring to fig. 4, fig. 4 is a block diagram of a hydraulic system exhaust control device according to an embodiment of the present invention, where the hydraulic system exhaust control device includes:

the acquiring unit 10 is used for acquiring the energy storage pressure of an energy accumulator in the hydraulic system after the hydraulic system is powered on;

the judging unit 20 is used for judging whether the energy storage pressure is in a preset pressure range or not;

the first control unit 30 is configured to control an energy accumulator safety valve and a pipeline safety valve in the hydraulic system to respectively execute N times of first opening and closing actions if the energy storage pressure is within the preset pressure range, where N is greater than or equal to 1;

and the second control unit 40 is used for controlling the action valves of each executing part in the hydraulic system to execute M times of second opening and closing actions under the condition that the accumulator safety valve and the pipeline safety valve execute N times of first opening and closing actions, wherein M is more than or equal to 1.

Optionally, the first opening and closing action includes:

the method comprises the steps of keeping the switch-on within a first preset time length, and keeping the switch-off within a second preset time length after the first preset time length is finished.

Optionally, the second opening and closing action includes:

and keeping the switch-on within a third preset time, and keeping the switch-off within a fourth preset time after the third preset time is ended.

Optionally, referring to fig. 5, fig. 5 is a block diagram of another hydraulic system control device provided in an embodiment of the present invention, and on the basis of the embodiment shown in fig. 4, the device further includes:

a setting unit 50 for setting a predetermined flag for indicating that the hydraulic system is entering an exhaust control process.

A reset unit 60, configured to reset the preset flag.

It should be noted that the units described in the embodiments of the present disclosure may be implemented by software, and may also be implemented by hardware. Where the name of a unit does not in some cases constitute a limitation of the unit itself, for example, the first determination unit may also be described as a "unit that determines a target service".

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

While several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents does not depart from the spirit of the disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.