CN113819095B - Hydraulic system, control method of hydraulic system and engineering machinery - Google Patents
Hydraulic system, control method of hydraulic system and engineering machinery Download PDFInfo
- Publication number
- CN113819095B CN113819095B CN202110938354.0A CN202110938354A CN113819095B CN 113819095 B CN113819095 B CN 113819095B CN 202110938354 A CN202110938354 A CN 202110938354A CN 113819095 B CN113819095 B CN 113819095B
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- oil
- pilot
- temperature
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims description 43
- 239000012530 fluid Substances 0.000 claims description 15
- 238000012885 constant function Methods 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 185
- 239000010720 hydraulic oil Substances 0.000 abstract description 49
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
Abstract
The embodiment of the invention provides a hydraulic system, a control method of the hydraulic system and engineering machinery. The hydraulic system includes: the hydraulic pump, the control unit and the pilot oil source valve bank are connected with the first oil inlet of the hydraulic pump to the oil tank; an oil inlet of the pilot oil source valve bank is communicated with a first oil outlet of the hydraulic pump; the pilot oil source valve group comprises an electromagnetic proportional pressure reducing valve; the control unit is used for acquiring the working environment parameters of the oil tank, and determining and transmitting corresponding control parameters according to the working environment parameters of the oil tank; the control end of the electromagnetic proportional pressure reducing valve is electrically connected with the control unit, and the electromagnetic proportional pressure reducing valve is used for adjusting the opening degree of the valve core according to the received control parameters so as to adjust the hydraulic pressure of hydraulic oil pumped from the hydraulic pump to the pilot oil source valve group. According to the pilot oil source valve bank, the input oil pressure is automatically adjusted according to the hydraulic oil temperature by a set program of the controller, so that the self-adaptability of the pilot oil source valve bank in controlling the pilot control valve is improved.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a hydraulic system, a control method of the hydraulic system and engineering machinery.
Background
Under a low-temperature environment, the operating speed of engineering machinery such as a hydraulic excavator and the like needs to be changed from slow to fast, and the hydraulic oil can be operated at a normal speed after the temperature of the hydraulic oil is increased to a proper value; if the proper temperature is not reached, the viscosity of the hydraulic oil is extremely high, the resistance of the pipeline is increased rapidly in multiple times, the hydraulic pipeline is affected, and the service life of the hydraulic pipeline is reduced; in this environment, the process is controlled mainly by the experience of the operator, so that the labor intensity of operators is increased, and risks such as pipeline bursting and the like are easily caused if the operators are improperly operated.
Disclosure of Invention
The embodiment of the invention aims to provide a hydraulic system, a control method of the hydraulic system and engineering machinery, which at least solve the problem that in the engineering machinery, under a low-temperature environment, the risk of pipe explosion and the like is caused by insufficient operation experience.
In order to achieve the above object, the present invention provides a hydraulic system including:
a hydraulic pump having a first oil inlet and a first oil outlet, the first oil inlet being connected to an oil tank;
the pilot oil source valve bank is provided with an oil inlet, and the oil inlet of the pilot oil source valve bank is communicated with a first oil outlet of the hydraulic pump; the pilot oil source valve group comprises an electromagnetic proportional pressure reducing valve;
the control unit is used for acquiring the working environment parameters of the oil tank, and determining and sending corresponding control parameters according to the working environment parameters of the oil tank;
the control end of the electromagnetic proportional pressure reducing valve is electrically connected with the control unit, and the electromagnetic proportional pressure reducing valve is used for adjusting the opening degree of the valve core according to the received control parameters so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump to the pilot oil source valve group.
Optionally, the working environment parameters of the oil tank include the temperature of hydraulic fluid; the control parameters comprise valve element opening signals; the control unit includes: a temperature sensor and a controller; the temperature sensor is used for collecting the temperature of the hydraulic liquid in the oil tank; the controller is used for acquiring the temperature of the hydraulic liquid, determining and sending a corresponding valve core opening signal according to the temperature of the hydraulic liquid; the electromagnetic proportional pressure reducing valve is used for adjusting the valve element opening according to the received valve element opening signal so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump to the pilot oil source valve group.
Optionally, the control unit is further configured to output a preset control parameter in response to the emergency control signal;
the electromagnetic proportional pressure reducing valve is also used for adjusting the opening degree of the valve core according to the received preset control parameter so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump to the pilot oil source valve group.
Optionally, the pilot oil source valve group further includes: the oil outlet of the first reversing valve is used as a first control oil outlet of the pilot oil source valve group, and the oil inlet of the first reversing valve is communicated with the oil outlet of the electromagnetic proportional pressure reducing valve; an oil inlet of the electromagnetic proportional pressure reducing valve is used as an oil inlet of the pilot oil source valve group; the first control oil outlet of the pilot oil source valve group is connected to the first control oil inlet of the pilot control valve through the pilot operation valve.
Optionally, the hydraulic system further includes: the main valve is provided with a main oil inlet and a functional oil port; the pilot control valve is provided with a functional pilot oil port; the functional pilot oil port of the pilot control valve is communicated with the functional oil port of the main valve; the first control oil inlet of the pilot control valve is communicated with the first control oil outlet of the pilot oil source valve group.
Optionally, the pilot oil source valve group is further provided with a second control oil outlet; the hydraulic system further includes: the hydraulic motor is provided with a speed-changing oil port; and a second control oil outlet of the pilot oil source valve group is communicated with a speed-changing oil port of the hydraulic motor.
The invention also provides a control method of the hydraulic system, the hydraulic system comprises: the hydraulic pump is provided with a first oil outlet and a first oil inlet; the first oil inlet is connected to an oil tank; the pilot oil source valve bank is provided with an oil inlet, and the oil inlet of the pilot oil source valve bank is communicated with a first oil outlet of the hydraulic pump;
the control method comprises the following steps: and acquiring working environment parameters of an oil tank, determining and sending corresponding control parameters according to the working environment parameters of the oil tank, and adjusting the valve core opening of the pilot oil source valve group according to the received control parameters so as to adjust the hydraulic pressure of hydraulic liquid pumped from the hydraulic pump to the pilot oil source valve group.
Optionally, the working environment parameters of the oil tank include the temperature of hydraulic fluid; the control parameters comprise valve element opening signals; the control method comprises the following steps: acquiring a temperature parameter of hydraulic liquid in an oil tank, determining and sending a corresponding valve core opening signal according to the temperature parameter of the hydraulic liquid, and adjusting the valve core opening of the pilot oil source valve group according to the received valve core opening signal so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump to the pilot oil source valve group.
Optionally, the control method further includes: and outputting a preset control parameter in response to an emergency control signal, so that the pilot oil source valve bank adjusts the opening degree of a valve core according to the received preset control parameter to adjust the hydraulic pressure of hydraulic liquid pumped from the hydraulic pump to the pilot oil source valve bank.
Optionally, the determining a corresponding opening signal according to the temperature of the hydraulic liquid includes:
determining an adjusting function between the temperature of the hydraulic liquid and the opening signal according to a temperature interval in which the temperature of the hydraulic liquid is located;
and obtaining a corresponding opening signal according to the adjusting function.
Optionally, the determining the adjusting function between the temperature of the hydraulic fluid and the opening signal according to the temperature interval in which the temperature of the hydraulic fluid is located includes:
when the temperature parameter of the hydraulic liquid belongs to a first interval, the regulating function is a proportional relation function, and a positive proportionality coefficient K of the proportional relation function is:
wherein the first interval is [ T0, tmax ], and T0 is a reference temperature point of the initial output pressure of the pilot oil source valve group; tmax is a reference temperature point of output pressure of the pilot oil source valve group in a normal state; p10 is a reference pressure value output by the pilot oil source valve group corresponding to the temperature T0; p1max is the pressure value corresponding to the temperature Tmax;
when the temperature parameter of the hydraulic liquid belongs to a section of which the temperature of the hydraulic liquid is smaller than T0, the regulating function is a first constant function, and the value of the first constant function is an opening value corresponding to a reference pressure value output by a pilot oil source valve group corresponding to the temperature T0;
when the temperature parameter of the hydraulic fluid belongs to a section that the temperature of the hydraulic fluid is greater than or equal to Tmax, the regulating function is a second constant function, and the value of the second constant function is an opening value corresponding to a pressure value output by the temperature Tmax corresponding to the normal state of the pilot oil source valve group.
The invention also provides engineering machinery comprising the hydraulic system.
Through the technical scheme, the input oil pressure of the pilot oil source valve bank is automatically adjusted according to the temperature of the hydraulic liquid by a controller setting program, so that the self-adaptability of the pilot oil source valve bank for controlling the pilot control valve is improved, and the pipe explosion risk caused by improper operation is reduced.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic illustration of a hydraulic system provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pilot oil source valve set according to an embodiment of the present invention.
Description of the reference numerals
Pilot oil source valve group 3 of hydraulic pump 2 of hydraulic oil tank 1
Hydraulic motor 6 of hydraulic cylinder 5 of main valve 4
Temperature sensor 9 of pilot control valve 7 controller 8
The first reversing valve 3-1, the second reversing valve 3-2 and the overflow valve 3-3
One-way valve 3-4 accumulator 3-5 electromagnetic proportional pressure reducing valve 3-6
Function oil port (a 1, a2, b1, b 2)
Functional pilot ports (a 1', a2', b1', b 2')
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
"connected" as used herein means electrically powered or signal connected between two components; "connected" may be a direct connection between two elements, or may be connected via an intermediate medium (e.g., a wire), or may be an indirect connection via a third element.
Example 1
As shown in fig. 1 and 2, an embodiment of the present invention provides a hydraulic system including:
a hydraulic pump 2 having a first oil inlet and a first oil outlet, the first oil inlet being connected to an oil tank;
the pilot oil source valve group 3 is provided with an oil inlet, and the oil inlet of the pilot oil source valve group 3 is communicated with a first oil outlet of the hydraulic pump 2; the pilot oil source valve group 3 comprises an electromagnetic proportional pressure reducing valve 3-6;
the control unit is used for acquiring the working environment parameters of the oil tank, and determining and sending corresponding control parameters according to the working environment parameters of the oil tank;
the control end of the electromagnetic proportional pressure reducing valve 3-6 is electrically connected with the control unit, and the electromagnetic proportional pressure reducing valve 3-6 is used for adjusting the opening degree of a valve core according to the received control parameter so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump 2 to the pilot oil source valve group 3. The hydraulic fluid in this embodiment is preferably hydraulic oil, and the following is preferably implemented by hydraulic oil.
Further, the working environment parameters of the oil tank comprise the temperature of hydraulic oil; the control parameters comprise valve element opening signals;
the control unit includes: a temperature sensor 9 and a controller 8;
the temperature sensor 9 is used for collecting the temperature of the hydraulic oil in the oil tank;
the controller 8 is used for acquiring the temperature of the hydraulic oil, determining and sending a corresponding valve element opening signal according to the temperature of the hydraulic oil;
the electromagnetic proportional pressure reducing valve 3-6 is used for adjusting the valve element opening according to the received valve element opening signal so as to adjust the hydraulic pressure of the hydraulic oil pumped from the hydraulic pump 2 to the pilot oil source valve group 3.
In a possible embodiment, the control unit is further configured to output a preset control parameter in response to an emergency control signal;
the electromagnetic proportional pressure reducing valve 3-6 is further used for adjusting the opening degree of a valve core according to the received preset control parameter so as to adjust the hydraulic pressure of the hydraulic oil pumped from the hydraulic pump 2 to the pilot oil source valve group 3. In an emergency, after the emergency button is pressed, the electromagnetic proportional pressure reducing valve 3-6 in the pilot oil source valve group 3 adjusts the hydraulic pressure of hydraulic oil entering the pilot oil source valve group 3 according to preset control parameters set by normal temperature, so that the quick response of control equipment is ensured.
Alternatively, in this embodiment, the pilot operated valve is preferably a pilot handle; the pilot oil source valve group 3 further includes:
the oil outlet of the first reversing valve 3-1 is used as a first control oil outlet of the pilot oil source valve group 3, and the oil inlet of the first reversing valve 3-1 is communicated with the oil outlet of the electromagnetic proportional pressure reducing valve 3-6;
the oil inlet of the electromagnetic proportional pressure reducing valve 3-6 is used as the oil inlet of the pilot oil source valve group 3; the first control oil outlet P2 of the pilot oil source valve group 3 is connected to the first control oil inlet of the pilot control valve 7 through a pilot handle. By such a design, the hydraulic oil pressure controlled by the pilot control valve 7 is determined by the pilot pressure generated by the pilot oil source valve group 3 and the swing angle generated by the pilot handle; the pilot pressure generated by the pilot oil source valve bank 3 is primary pressure regulation, so that the inlet hydraulic oil pressure of the pilot oil source valve bank 3 can be regulated according to the hydraulic oil temperature in the hydraulic oil tank 1, and the hydraulic system can be enabled to be at a safe hydraulic pressure at different temperatures; the operator can control according to the needs when operating the guide handle, has reduced the intensity of labour that relies on experience to control under low temperature environment.
Further, the hydraulic system further includes:
a main valve 4, wherein the main valve 4 is provided with a main oil inlet and functional oil ports (a 1, a2, b1, b 2);
the pilot control valve 7 is provided with functional pilot oil ports (a 1', a2', b1', b 2') which are matched with the functional oil ports;
the functional pilot oil ports (a 1', a2', b1', b 2') of the pilot control valve 7 and the functional oil ports (a 1, a2, b1, b 2) of the main valve 4 are communicated from left to right in a one-to-one correspondence manner and respectively act on two ends of a main valve core; the first control oil inlet of the pilot control valve 7 is communicated with the first control oil outlet of the pilot oil source valve group 3.
Further, the pilot oil source valve group 3 is also provided with a second control oil outlet; the hydraulic system further includes: a hydraulic motor 6 having a speed change oil port; the second control oil outlet (the oil outlet P1 of the second reversing valve 3-2) of the pilot oil source valve group 3 is communicated with a speed changing oil port of the hydraulic motor 6. The function ports a1 and b1 are used for controlling the forward and reverse rotation of the hydraulic motor 6. When the hydraulic oil cylinder is particularly used, the main valve 4 is also connected with the hydraulic oil cylinder 5, and the functional oil ports a2 and b2 control the large cavity and the small cavity of the hydraulic oil cylinder 5 to act. The speed of the hydraulic motor 6 and the hydraulic cylinder 5 is mainly controlled by the valve opening of the main valve 4, and the valve opening of the valve core of the main valve 4 is mainly controlled by the pilot control valve 7. The pilot control valve 7 is determined by pilot pressure generated by the pilot oil source valve group 3 and pilot handle swing angle adjusting oil pressure, the pilot pressure is provided by an electromagnetic proportional pressure reducing valve, the pressure is set according to different temperature conditions and is automatically controlled by the controller 8, and therefore the operation comfort of operators is improved. Under the low-temperature environment, the operating speed of engineering machinery such as a hydraulic excavator needs to be changed from slow to fast, the hydraulic oil can be operated at a normal speed after the temperature of the hydraulic oil is raised to a proper value, if the hydraulic oil does not reach the proper temperature, the viscosity of the hydraulic oil is extremely high, the resistance of a pipeline is increased rapidly in a multiple way, the service life of the hydraulic pipeline is reduced, and even the pipeline burst and other risks occur. Therefore, the working pressure of the pilot oil source valve group 3 is automatically regulated according to the temperature by the controller 8 under the environment, so that the process is prevented from being controlled mainly by the experience of an operator, and the labor intensity of operators is reduced. In the emergency, for quick response, the controller 8 can control the electromagnetic proportional pressure reducing valve 3-6 in the pilot oil source valve group 3 to adjust the hydraulic pressure of hydraulic oil entering the pilot oil source valve group 3 according to preset control parameters set by normal temperature through the emergency button, so that quick response of control equipment is ensured.
In order to improve the safety of the pilot oil source valve group 3, an overflow valve 3-3 may be connected in series between the electromagnetic proportional pressure reducing valve 3-6 and the first reversing valve 3-1, and hydraulic oil may be introduced into the hydraulic oil tank 1 when the outlet pressure of the electromagnetic proportional pressure reducing valve 3-6 is higher than a set value.
In order to stop operation under faults such as power failure of the hydraulic pump 2, for example, the operation of parking a working device or a bulldozer and other mechanisms on the ground when the hydraulic pump 2 is powered off is performed; a mechanical pressurizing device can be arranged at the oil outlet of the electromagnetic proportional pressure reducing valve 3-6, and hydraulic oil at the oil outlet of the electromagnetic proportional pressure reducing valve 3-6 is respectively conveyed to the oil inlets of the first reversing valve 3-1 and the second reversing valve 3-2 after passing through the mechanical pressurizing device; specifically, the mechanical pressurizing device comprises an accumulator 3-5 and a one-way valve 3-4; an oil outlet of the electromagnetic proportional pressure reducing valve 3-6 is connected with an oil inlet of the one-way valve 3-4, and an oil outlet of the one-way valve 3-4 is connected with an oil port of the energy accumulator 3-5, an oil inlet of the first reversing valve 3-1 and an oil inlet of the second reversing valve 3-2. By releasing the pressure of the accumulator 3-5, a corresponding hydraulic pressure can be provided, and the working device or a bulldozer blade and other mechanisms can be parked on the ground under the condition that the hydraulic pump 2 is powered off.
The present embodiment also provides a control method of a hydraulic system, including: a hydraulic pump 2 having a first oil outlet and a first oil inlet; the first oil inlet is connected to an oil tank; the pilot oil source valve group 3 is provided with an oil inlet, and the oil inlet of the pilot oil source valve group 3 is communicated with a first oil outlet of the hydraulic pump 2;
the control method comprises the following steps:
acquiring working environment parameters of an oil tank, and determining and transmitting corresponding control parameters according to the working environment parameters of the oil tank; and adjusting the valve element opening of the pilot oil source valve group 3 according to the received control parameters so as to adjust the hydraulic pressure of the hydraulic oil pumped from the hydraulic pump 2 to the pilot oil source valve group 3.
Optionally, the working environment parameters of the oil tank include the temperature of hydraulic oil; the control parameters comprise valve element opening signals;
the control method comprises the following steps:
acquiring a temperature parameter of hydraulic oil in an oil tank, determining and sending a corresponding valve core opening signal according to the temperature parameter of the hydraulic oil, and adjusting the valve core opening of the pilot oil source valve group 3 according to the received valve core opening signal so as to adjust the hydraulic pressure of the hydraulic oil pumped from the hydraulic pump 2 to the pilot oil source valve group 3.
Optionally, the control method further includes:
in response to an emergency control signal, a preset control parameter is output so that the pilot oil source valve group 3 adjusts a valve spool opening according to the received preset control parameter to adjust a hydraulic pressure of hydraulic oil pumped from the hydraulic pump 2 to the pilot oil source valve group 3. After the emergency button is pressed, an emergency control signal is generated, and the electromagnetic proportional valve 3-1 in the pilot oil source valve group 3 outputs pilot pressure according to normal temperature, so that quick response of equipment is ensured.
Optionally, the determining a corresponding opening signal according to the temperature of the hydraulic liquid includes:
determining an adjusting function between the temperature of the hydraulic liquid and the opening signal according to a temperature interval in which the temperature of the hydraulic liquid is located; and obtaining a corresponding opening signal according to the adjusting function. Through the setting of the adjusting functions in different intervals, the control effect achieved by the control relation between the corresponding opening degree signals determined by the temperature of the hydraulic liquid can be more in line with the specific working condition of the engineering machinery. Specifically, when the temperature parameter of the hydraulic fluid belongs to the first interval, the adjustment function is a direct proportional relation function, and the direct proportional coefficient K is:
wherein the first interval is [ T0, tmax ], and T0 is a reference temperature point at which the pilot oil source valve group 3 starts to output pressure; tmax is a reference temperature point of output pressure of the pilot oil source valve group 3 in a normal state; p10 is a reference pressure value output by the pilot oil source valve group corresponding to the temperature T0; p1max is the pressure value corresponding to the temperature Tmax;
when the temperature parameter of the hydraulic liquid belongs to a section of which the temperature of the hydraulic liquid is smaller than T0, the regulating function is a first constant function, and the value of the first constant function is an opening value corresponding to a reference pressure value output by a pilot oil source valve group corresponding to the temperature T0;
when the temperature parameter of the hydraulic fluid belongs to a section that the temperature of the hydraulic fluid is greater than or equal to Tmax, the regulating function is a second constant function, and the value of the second constant function is an opening value corresponding to a pressure value output by the temperature Tmax corresponding to the normal state of the pilot oil source valve group.
Preferably, the pilot oil source valve group 3 includes an electromagnetic proportional pressure reducing valve 3-6, and when the pilot oil source valve group 3 is selected to determine the opening degree by the electromagnetic proportional pressure reducing valve 3-6 in particular so as to adjust the hydraulic pressure of the hydraulic oil pumped from the hydraulic pump 2 to the pilot oil source valve group 3, tmax is preferably a reference temperature point of the output pressure of the electromagnetic proportional pressure reducing valve 3-6 in a normal state; t0 is preferably a reference temperature point at which the electromagnetic proportional pressure reducing valve 3-6 starts to output pressure. After the secondary pressure curve of the main valve 4 is generally set with parameters, the secondary pressure curve is not readjusted and can be regarded as inherent parameters; the valve core displacement (opening) of the main valve 4 is mainly controlled by the output pressure of the pilot control valve 7, and the valve core displacement of the main valve 4 determines the speed of the action.
When the temperature of the hydraulic oil in the hydraulic oil tank 1 is smaller than the temperature T0, the control unit outputs an opening value corresponding to a reference pressure value P10 output by the electromagnetic proportional pressure reducing valve 3-6 corresponding to the temperature T0 (the opening value at this time is a constant value corresponding to the reference pressure P10), and the electromagnetic proportional pressure reducing valve 3-6 adjusts the pressure output by the pilot oil source valve group according to the opening value, so that the pressure of the hydraulic oil normally controlled by the main valve 4 and other components can be ensured.
When the temperature of the hydraulic oil in the hydraulic oil tank 1 is greater than or equal to T0 and smaller than Tmax, that is, when the temperature of the hydraulic oil belongs to a first interval, the control unit obtains an opening value corresponding to a pressure value output by the electromagnetic proportional pressure reducing valve 3-6 according to a positive proportion coefficient K (the output opening value is gradually increased according to the temperature in a proportion of K), and the electromagnetic proportional pressure reducing valve 3-6 adjusts the pressure output by the pilot oil source valve group according to the opening value, so that the pressure of the hydraulic oil controlled in the main valve 4 and other components can be enabled to be in a safe hydraulic pressure at different temperatures according to temperature change; the operator can control as required when operating the guide handle, has reduced the intensity of labour that relies on experience to control under low temperature environment to and prevented the risk of operating the improper pipe that causes of operating personnel.
When the temperature of the hydraulic oil in the hydraulic oil tank 1 is greater than or equal to the temperature Tmax, the control unit outputs an opening value corresponding to a pressure value output by the electromagnetic proportional pressure reducing valve 3-6 at the temperature Tmax corresponding to the normal state (the opening value at the moment is the opening value corresponding to the temperature Tmax and is a constant), and the electromagnetic proportional pressure reducing valve 3-6 adjusts the pressure output by the pilot oil source valve group according to the opening value, so that the hydraulic oil pressure of the normal control of the main valve 4 and other components can be ensured, and the response performance of the hydraulic system is improved.
The opening value of the electromagnetic proportional pressure reducing valve 3-6 in the normal state is determined according to the attribute of the electromagnetic proportional pressure reducing valve 3-6. The control logic of the output pressure and temperature of the pilot oil source valve bank 3 can be arranged in the controller 8, the controller 8 outputs corresponding valve core (valve core of the electromagnetic proportional pressure reducing valve 3-6) opening value signals (namely pressure) according to the temperature of the hydraulic oil, so that the pressure in the pilot oil source valve bank 3 is controlled along with the change of the temperature of the hydraulic oil, and the equipment is freely and normally operated through a pilot handle on the premise of ensuring the safety of a hydraulic system of the whole machine.
The embodiment also provides the engineering machine, which comprises the hydraulic system so as to improve the operation experience of the engineering machine.
The foregoing details of the optional implementation of the embodiment of the present invention have been described in detail with reference to the accompanying drawings, but the embodiment of the present invention is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present invention within the scope of the technical concept of the embodiment of the present invention, and these simple modifications all fall within the protection scope of the embodiment of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of embodiments of the present invention are not described in detail.
In addition, any combination of various embodiments of the present invention may be performed, so long as the concept of the embodiments of the present invention is not violated, and the disclosure of the embodiments of the present invention should also be considered.
Claims (10)
1. A hydraulic system, the hydraulic system comprising:
a hydraulic pump (2) having a first oil inlet and a first oil outlet, the first oil inlet being connected to an oil tank;
the pilot oil source valve group (3) is provided with an oil inlet, and the oil inlet of the pilot oil source valve group (3) is communicated with a first oil outlet of the hydraulic pump (2); the pilot oil source valve group (3) comprises an electromagnetic proportional pressure reducing valve (3-6);
the control unit is used for acquiring the working environment parameters of the oil tank, and determining and sending corresponding control parameters according to the working environment parameters of the oil tank; the control parameters comprise valve element opening signals;
the control end of the electromagnetic proportional pressure reducing valve (3-6) is electrically connected with the control unit, and the electromagnetic proportional pressure reducing valve (3-6) is used for adjusting the opening degree of a valve core according to the received control parameters so as to adjust the hydraulic pressure of hydraulic liquid pumped from the hydraulic pump (2) to the pilot oil source valve group (3);
wherein the operating environment parameters of the oil tank include the temperature of the hydraulic fluid;
the control unit comprises a temperature sensor (9) and a controller (8);
the temperature sensor (9) is used for collecting the temperature of the hydraulic liquid in the oil tank;
the controller (8) is used for acquiring the temperature of the hydraulic liquid, determining and sending a corresponding valve core opening signal according to the temperature of the hydraulic liquid;
the electromagnetic proportional pressure reducing valve (3-6) is used for adjusting the valve element opening according to the received valve element opening signal so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump (2) to the pilot oil source valve group (3).
2. The hydraulic system of claim 1, wherein the control unit is further configured to output a preset control parameter in response to an emergency control signal;
the electromagnetic proportional pressure reducing valve (3-6) is also used for adjusting the opening degree of a valve core according to the received preset control parameter so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump (2) to the pilot oil source valve group (3).
3. The hydraulic system according to claim 1, characterized in that the pilot oil source valve group (3) further comprises:
the oil outlet of the first reversing valve (3-1) is used as a first control oil outlet of the pilot oil source valve group (3), and the oil inlet of the first reversing valve (3-1) is communicated with the oil outlet of the electromagnetic proportional pressure reducing valve (3-6);
an oil inlet of the electromagnetic proportional pressure reducing valve (3-6) is used as an oil inlet of the pilot oil source valve group (3); the first control oil outlet of the pilot oil source valve group (3) is connected to the first control oil inlet of the pilot control valve (7) through a pilot operation valve.
4. A hydraulic system according to any one of claims 1 to 3, further comprising:
the main valve (4) is provided with a main oil inlet and a functional oil port;
the pilot control valve (7) is provided with a functional pilot oil port and a first control oil port;
the functional pilot oil port of the pilot control valve (7) is communicated with the functional oil port of the main valve (4); the first control oil inlet of the pilot control valve (7) is communicated with the first control oil outlet of the pilot oil source valve group (3).
5. The hydraulic system according to claim 4, characterized in that the pilot oil source valve group (3) also has a second control oil outlet; the hydraulic system further includes:
a hydraulic motor (6) having a speed change oil port;
and a second control oil outlet of the pilot oil source valve group (3) is communicated with a speed-changing oil port of the hydraulic motor (6).
6. A control method of a hydraulic system, characterized in that the hydraulic system comprises: a hydraulic pump (2) having a first oil outlet and a first oil inlet; the first oil inlet is connected to an oil tank; the pilot oil source valve group (3) is provided with an oil inlet, and the oil inlet of the pilot oil source valve group (3) is communicated with a first oil outlet of the hydraulic pump (2);
the control method comprises the following steps:
acquiring working environment parameters of an oil tank;
determining and transmitting corresponding control parameters according to the working environment parameters of the oil tank; the control parameters comprise valve element opening signals;
according to the received control parameters, adjusting the valve core opening of the pilot oil source valve group (3) so as to adjust the hydraulic pressure of hydraulic liquid pumped from the hydraulic pump (2) to the pilot oil source valve group (3);
wherein the operating environment parameters of the oil tank include the temperature of the hydraulic fluid;
the control method comprises the following steps:
acquiring temperature parameters of hydraulic liquid in an oil tank;
determining and sending a corresponding valve element opening signal according to the temperature parameter of the hydraulic liquid;
and adjusting the valve element opening of the pilot oil source valve group (3) according to the received valve element opening signal so as to adjust the hydraulic pressure of the hydraulic liquid pumped from the hydraulic pump (2) to the pilot oil source valve group (3).
7. The control method according to claim 6, characterized in that the control method further comprises:
in response to an emergency control signal, a preset control parameter is output, so that the pilot oil source valve group (3) adjusts the valve core opening according to the received preset control parameter to adjust the hydraulic pressure of hydraulic liquid pumped from the hydraulic pump (2) to the pilot oil source valve group (3).
8. The control method according to claim 6, wherein the determining the corresponding opening degree signal according to the temperature of the hydraulic fluid includes:
determining an adjusting function between the temperature of the hydraulic liquid and the opening signal according to a temperature interval in which the temperature of the hydraulic liquid is located;
and obtaining a corresponding opening signal according to the adjusting function.
9. The control method according to claim 6, wherein the determining an adjustment function between the temperature of the hydraulic fluid and the opening degree signal according to a temperature interval in which the temperature of the hydraulic fluid is located includes:
when the temperature parameter of the hydraulic liquid belongs to a first interval, the regulating function is a proportional relation function, and a positive proportionality coefficient K of the proportional relation function is:
wherein the first interval is [ T0, tmax ], and T0 is a reference temperature point at which the pilot oil source valve group (3) starts to output pressure; tmax is a reference temperature point of output pressure of the pilot oil source valve group (3) in a normal state; p10 is a reference pressure value output by the pilot oil source valve group (3) corresponding to the temperature T0; p1max is the pressure value corresponding to the temperature Tmax;
when the temperature parameter of the hydraulic liquid belongs to a section of which the temperature of the hydraulic liquid is smaller than T0, the regulating function is a first constant function, and the value of the first constant function is an opening value corresponding to a reference pressure value output by a pilot oil source valve group (3) corresponding to the temperature T0;
when the temperature parameter of the hydraulic liquid belongs to a section that the temperature of the hydraulic liquid is greater than or equal to Tmax, the regulating function is a second constant function, and the value of the second constant function is an opening value corresponding to a pressure value output by the temperature Tmax corresponding to the normal state of the pilot oil source valve group (3).
10. A construction machine comprising a hydraulic system according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110938354.0A CN113819095B (en) | 2021-08-16 | 2021-08-16 | Hydraulic system, control method of hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110938354.0A CN113819095B (en) | 2021-08-16 | 2021-08-16 | Hydraulic system, control method of hydraulic system and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113819095A CN113819095A (en) | 2021-12-21 |
| CN113819095B true CN113819095B (en) | 2023-12-08 |
Family
ID=78923016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110938354.0A Active CN113819095B (en) | 2021-08-16 | 2021-08-16 | Hydraulic system, control method of hydraulic system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113819095B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754030A (en) * | 2022-02-28 | 2022-07-15 | 徐州徐工矿业机械有限公司 | Hydraulic excavator pressure stabilizing system based on throttling control and using method |
| CN116624459B (en) * | 2023-07-19 | 2023-10-20 | 山河智能装备股份有限公司 | Self-adaptive pressurizing hydraulic system and construction equipment |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588359A (en) * | 2012-02-28 | 2012-07-18 | 上海中联重科桩工机械有限公司 | Hydraulic system, excavator and control method of hydraulic system |
| CN102758808A (en) * | 2012-07-26 | 2012-10-31 | 徐州徐工挖掘机械有限公司 | Pilot oil source control block of front high-pressure filter |
| CN103671364A (en) * | 2012-09-12 | 2014-03-26 | 上海宝冶集团有限公司 | Steering electrohydraulic control system for remote control loading machine |
| CN203582302U (en) * | 2013-11-28 | 2014-05-07 | 中联重科股份有限公司 | Control valve bank, hydraulic control system and truck crane |
| KR101674861B1 (en) * | 2016-05-24 | 2016-11-09 | 구인회 | Sysyem for controlling temperature of high pressure hydraulic oil |
| CN206668647U (en) * | 2017-03-08 | 2017-11-24 | 卡特彼勒（青州）有限公司 | Hydraulic system and there is its Work machine |
| CN107420383A (en) * | 2017-06-01 | 2017-12-01 | 武汉船用机械有限责任公司 | A kind of system and method for controlling hydraulic fluid temperature |
| CN109441915A (en) * | 2018-12-19 | 2019-03-08 | 湖南三港口设备有限公司 | Hydraulic system and engineering machinery |
| CN111219374A (en) * | 2019-11-18 | 2020-06-02 | 中铁四局集团有限公司 | Integrated pilot valve group for hydraulic walking control |
| CN111691492A (en) * | 2020-06-30 | 2020-09-22 | 徐州徐工挖掘机械有限公司 | Hydraulic system of excavator and excavator |
-
2021
- 2021-08-16 CN CN202110938354.0A patent/CN113819095B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588359A (en) * | 2012-02-28 | 2012-07-18 | 上海中联重科桩工机械有限公司 | Hydraulic system, excavator and control method of hydraulic system |
| CN102758808A (en) * | 2012-07-26 | 2012-10-31 | 徐州徐工挖掘机械有限公司 | Pilot oil source control block of front high-pressure filter |
| CN103671364A (en) * | 2012-09-12 | 2014-03-26 | 上海宝冶集团有限公司 | Steering electrohydraulic control system for remote control loading machine |
| CN203582302U (en) * | 2013-11-28 | 2014-05-07 | 中联重科股份有限公司 | Control valve bank, hydraulic control system and truck crane |
| KR101674861B1 (en) * | 2016-05-24 | 2016-11-09 | 구인회 | Sysyem for controlling temperature of high pressure hydraulic oil |
| CN206668647U (en) * | 2017-03-08 | 2017-11-24 | 卡特彼勒（青州）有限公司 | Hydraulic system and there is its Work machine |
| CN107420383A (en) * | 2017-06-01 | 2017-12-01 | 武汉船用机械有限责任公司 | A kind of system and method for controlling hydraulic fluid temperature |
| CN109441915A (en) * | 2018-12-19 | 2019-03-08 | 湖南三港口设备有限公司 | Hydraulic system and engineering machinery |
| CN111219374A (en) * | 2019-11-18 | 2020-06-02 | 中铁四局集团有限公司 | Integrated pilot valve group for hydraulic walking control |
| CN111691492A (en) * | 2020-06-30 | 2020-09-22 | 徐州徐工挖掘机械有限公司 | Hydraulic system of excavator and excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113819095A (en) | 2021-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113819095B (en) | Hydraulic system, control method of hydraulic system and engineering machinery | |
| US9512918B2 (en) | Speed control system for a hydrostatic transmission | |
| US7464545B2 (en) | Hydraulic system and work machine comprising such a system | |
| EP2935904B1 (en) | Proportional flow control of a fluid pump assembly | |
| CN102720710B (en) | The controlling method of hydraulic system, hydraulic system and engineering machinery | |
| CN112682373B (en) | Hydraulic system, control method and engineering vehicle | |
| CN106068389A (en) | Electronic torque and Stress control for load-sensing pump | |
| JP2011256814A (en) | Pump discharge amount control circuit for construction machine | |
| US9482246B2 (en) | Hydrostatic drive | |
| CN208089650U (en) | A kind of automobile-used impeller rotating hydraulic system of sand throwing fire extinguishing | |
| CN110953197B (en) | Power control hydraulic system and crane | |
| EP2989350B1 (en) | Hydraulic circuit for the transmissions of industrial and agricultural vehicles | |
| KR20110074388A (en) | Hydraulic circuit for construction machinery | |
| KR20100075300A (en) | Hydraulic pump control apparatus for construction machinery | |
| CN106151135B (en) | A kind of concrete pumping hydraulic control system and concrete pumping machinery | |
| CN108167237A (en) | The hydraulic control system and excavator of engineering machinery | |
| CN112681445A (en) | Oil return control system and excavator | |
| CN205260475U (en) | Engineering vehicle's hydraulic system and fire engine | |
| JP3535759B2 (en) | Hydraulic valve control device | |
| JP2005163979A (en) | Vehicle transmission | |
| CN113148884B (en) | Emergency power device and crane winch emergency hydraulic control system | |
| CN217462693U (en) | Hydraulic system with multiple pressure outputs and engineering machinery comprising same | |
| CN216241552U (en) | Pumping hydraulic system and wet spraying machine | |
| CN209800386U (en) | hydraulic combination valve for controlling rotation of roller in pipe cable equipment | |
| CN207131657U (en) | It is a kind of from depressurized system and with from the hydraulic pump of decompression |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |