CN104454801A - Hydraulic oil temperature control system and method - Google Patents
Hydraulic oil temperature control system and method Download PDFInfo
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- CN104454801A CN104454801A CN201410527269.5A CN201410527269A CN104454801A CN 104454801 A CN104454801 A CN 104454801A CN 201410527269 A CN201410527269 A CN 201410527269A CN 104454801 A CN104454801 A CN 104454801A
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- 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
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Abstract
The invention discloses a hydraulic oil temperature control system and method. The hydraulic oil temperature control system comprises an oil cooling device (3), a bypass valve (5), an oil temperature detection device (2), a pressure detection device (8) and a controller (1), wherein the oil temperature detection device (2) and the pressure detection device (8) are electrically connected to the controller (1), and the controller (1) controls the opening degree of the bypass valve (5) according to temperature signals input through the oil temperature detection device (2) and pressure signals input through the pressure detection device (8). By means of the hydraulic oil temperature control system, the temperature of hydraulic oil can be correspondingly adjusted according to the environment temperature, and system parts such as the hydraulic oil cooling device are correspondingly protected.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, particularly, relate to a kind of hydraulic oil temperature control system, and a kind of hydraulic fluid temperature controlling method.
Background technique
Usually, in hydraulic system, the temperature of hydraulic oil is one of key factor of influential system performance, and suitable hydraulic fluid temperature is the necessary requirement that hydraulic system plays optimum performance.If hydraulic fluid temperature is too low, then viscosity is very large, can cause system difficulty in starting, the pressure loss increases, and likely cause some hydraulic element to aggravate premature wear because there is no enough hydraulic oil lubrications, shorten the working life of hydraulic element, reduce the performance of system; If analysis of hydraulic oil overheat, then viscosity is very little, and system amount of leakage can be caused to increase, and likely causes hydraulic element friction pair because setting up the oil film of adequate thickness and unstable wear.
Therefore, in order to the temperature enabling hydraulic fluid temperature keep suitable, prior art provides a kind of hydraulic system of Oil-temperature control, and this hydraulic system comprises oil cooler, the one-way valve in parallel with this oil cooler.Like this, when oil cooler normally works, closed check valve; system oil return flows back to fuel tank after being lowered the temperature by oil cooler, prevents the temperature of oil temperature too high, and when oil cooler operation irregularity; one-way valve will be opened, and system oil return flows back to fuel tank by this one-way valve, thus protection oil cooler.
But, such temperature controlling hydraulically system uses in reality also exists certain defect, namely always have part system oil return to flow back to fuel tank by this one-way valve, and this is when ambient temperature is higher, the utilization efficiency of oil cooler will be reduced, and in order to prevent high oil temperature, more powerful oil cooler of having to use, this will cause the increase of cost, and when the temperature of the surroundings is low, because most of system oil return is lowered the temperature through oil cooler, cause oil temperature lower, thus add the preheat time of hydraulic oil.
Summary of the invention
The object of this invention is to provide a kind of hydraulic oil temperature control system, this hydraulic oil temperature control system environmentally temperature can carry out the temperature of correspondingly regulator solution force feed, and protects accordingly system unit such as hydraulic oil cooling device.
To achieve these goals, the invention provides a kind of hydraulic oil temperature control system, this hydraulic oil temperature control system comprise be connected on oil cooler in system oil return road and the bypass valve be connected in parallel with this oil cooler, for detect hydraulic fluid temperature in the oil circuit of oil cooler downstream oil temperature detection device, for detecting the pressure-detecting device of hydraulic fluid pressure in the oil circuit of oil cooler upstream; And controller; Wherein, oil temperature detection device and pressure-detecting device are electrically connected on controller, and controller controls the aperture of bypass valve according to the temperature signal of oil temperature detection device and pressure-detecting device input and pressure signal.
Pass through technique scheme, because controller is electrically connected with pressure-detecting device and oil temperature detection device, and controller controls the aperture of bypass valve according to the temperature signal of oil temperature detection device and pressure-detecting device input and pressure signal, like this, when the oil temperature that oil temperature detection device detects is less than the temperature value of setting, controller makes bypass valve open, a part for hydraulic oil-returning is by direct oil return, another part is oil return after oil cooler cooling then, thus improve the temperature of hydraulic oil fast, reduce preheat time, when the oil temperature that oil temperature detection device detects is greater than the temperature value of setting, controller will make bypass valve close, now, hydraulic oil-returning will all lower the temperature after oil return, thus prevent analysis of hydraulic oil overheat, simultaneously, pressure-detecting device detects hydraulic fluid pressure in the oil circuit of oil cooler upstream, when the force value detected is greater than the force value of setting, controller will make bypass valve open, make a part for hydraulic oil-returning by direct oil return, another part is oil return after oil cooler cooling then, thus system unit such as oil cooler is played a protective role.
Preferably, described controller has precedence over according to the temperature signal of described oil temperature detection device input the control of described bypass valve according to the control of pressure signal to described bypass valve that described pressure-detecting device inputs.
Preferably, described controller be set as at interval of the temperature allocating time cycle just call once described oil temperature detection device input temperature signal.
Preferably, the connection position of described bypass valve is provided with throttle orifice.
Preferably, described bypass valve is electromagnetism bypass valve, and this electromagnetism bypass valve is electrically connected with described controller.
Preferably, described bypass valve is hydraulic control bypass valve, and described controller is electrically connected with pilot solenoid valve, and this pilot solenoid valve is communicated in hydraulic power by pioneer pump; When the spool of described pilot solenoid valve is in primary importance, the control port of described hydraulic control bypass valve is communicated with the return opening of described pilot solenoid valve, when the spool of described pilot solenoid valve is in the second place, the control port of described hydraulic control bypass valve is communicated with the oil outlet of described pilot solenoid valve.
Preferably, described controller is electrically connected with monitoring unit.
In addition, the present invention also provides a kind of hydraulic fluid temperature controlling method, and the method comprises: the oil temperature detecting oil supply source, and compares detecting the oil temperature T1 obtained with set temperature value T; As T1 ﹤ T, the direct oil return of a part of hydraulic oil-returning is to described oil supply source, and after another part cooling, oil return is to described oil supply source; As T1>T, after described hydraulic oil-returning cooling, oil return is to described oil supply source; And detect the pressure value P 1 of the described hydraulic oil-returning before cooling, when the pressure value P of pressure value P 1> setting, the direct oil return of a part of described hydraulic oil-returning is to described oil supply source, and after another part cooling, oil return is to described oil supply source.
By this hydraulic fluid temperature controlling method, the present invention environmentally temperature can carry out the temperature of correspondingly regulator solution force feed, and protects accordingly system unit such as hydraulic oil cooling device.
Preferably, comparatively the control of described hydraulic oil-returning is had precedence over according to temperature relatively to the control of described hydraulic oil-returning according to pressure ratio.
Preferably, at interval of the temperature allocating time cycle, just carry out comparing of oil temperature T1 and set temperature value T.
Preferably, within the described temperature allocating time cycle, oil return after the part cooling of described hydraulic oil-returning.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the schematic diagram of a kind of hydraulic oil temperature control system that the specific embodiment of the invention provides;
Fig. 2 is the schematic diagram of the another kind of hydraulic oil temperature control system that the specific embodiment of the invention provides.
Description of reference numerals
1-controller, 2-oil temperature detection device, 3-oil cooler, 4-bleed off circuit, 5-bypass valve, 6-system oil return road, 7-hydraulic power, 8-pressure-detecting device, 9-electromagnetism bypass valve, 10-hydraulic control bypass valve, 11-pilot solenoid valve, 12-pioneer pump, 13-control port, 14-precursor overflow valve, 15-monitoring unit, 16-fuel tank.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As illustrated in fig. 1 and 2, the hydraulic oil temperature control system that the specific embodiment of the invention provides comprises the oil cooler 3 be connected in system oil return road 6, the bypass valve 5 be connected in parallel with oil cooler 3, for detecting the oil temperature detection device 2 of hydraulic fluid temperature in the oil circuit of oil cooler 3 downstream, for detecting the pressure-detecting device 8 of hydraulic fluid pressure in the oil circuit of oil cooler 3 upstream, and controller 1, wherein, oil temperature detection device 2 and pressure-detecting device 8 are electrically connected on controller 1, the temperature signal that controller 1 inputs according to oil temperature detection device 2 and pressure-detecting device 8 and pressure signal control the aperture of bypass valve 5.
Because controller is electrically connected with pressure-detecting device and oil temperature detection device, and controller is for controlling the aperture of bypass valve, like this, when the oil temperature that oil temperature detection device detects is less than the temperature value of setting, controller makes bypass valve open, a part for hydraulic oil-returning is by direct oil return, another part is oil return after oil cooler cooling then, thus improve the temperature of hydraulic oil fast, reduce preheat time, and when the oil temperature that oil temperature detection device detects is greater than the temperature value of setting, controller will make bypass valve close, now, hydraulic oil-returning will all lower the temperature after oil return, thus prevent analysis of hydraulic oil overheat, thus hydraulic fluid temperature is controlled in optimum temperature value, simultaneously, pressure-detecting device detects hydraulic fluid pressure in the oil circuit of oil cooler upstream, when the force value detected is greater than the force value of setting, controller will make bypass valve open, make a part for hydraulic oil-returning by direct oil return, another part is oil return after oil cooler cooling then, thus system unit such as oil cooler is played a protective role.
System oil return road 6 can be parallel with bleed off circuit 4, and bypass valve 5 is connected in this bleed off circuit 4, and bypass valve 5 and oil cooler 3 are connected in parallel.
Further, in order to ensure stability and Security, the Stress control of this hydraulic oil temperature Ore-controlling Role to bypass valve 5 has precedence over temperature and controls, namely, controller 1 according to the control of pressure signal to bypass valve 5 that pressure-detecting device 8 inputs have precedence over according to oil temperature detection device 2 input temperature signal to the control of bypass valve 5.Like this, when this hydraulic oil temperature control system starts operation, pressure in the system oil return road 6 of first pressure-detecting device 8 pairs of oil cooler 3 upstreams, preferably the pressure of oil cooler 3 ingress is detected, if the pressure P detected 1 is greater than the pressure value P of default, then controller 1 controls bypass valve and opens, make a part for hydraulic oil-returning by the direct oil return of bypass valve, another part is by oil return after oil cooler cooling, subsequently, in the operation process of this hydraulic oil temperature control system, as long as the pressure P detected 1 is greater than the pressure value P of default, control bypass valve is opened by controller 1, thus to system unit, particularly oil cooler plays further protective action.
In addition, fluctuate up and down in optimum temperature value in order to avoid hydraulic fluid temperature and cause bypass valve frequently to open and close, cause this system to shake, preferably, controller 1 is set as the temperature signal just calling oil temperature detection device 2 input at interval of temperature allocating time cycle t.Like this, in this temperature allocating time cycle t, bypass valve will not produce action, thus effectively can improve the stability of this hydraulic oil temperature control system.
The optimum temperature value of described hydraulic fluid temperature can be determined according to the viscosity-temperature characteristics of used hydraulic oil, and temperature allocating time cycle t can environmentally temperature, and the characteristic of hydraulic oil etc. are determined.
Further, in order to avoid in this temperature allocating time cycle t, oil temperature rises to higher temperature, and preferably, the connection position of bypass valve 5 is provided with throttle orifice.Like this, by this throttle orifice, a part of hydraulic oil-returning can be forced to be dispelled the heat by oil cooler, thus avoid in temperature allocating time cycle t, the oil temperature detected due to never call oil temperature detection device and the high oil temperature caused.
In addition, pressure-detecting device 8 can be pressure transducer or pressure switch.
Oil temperature detection device 2 can be oil temperature sensor.
Certainly, the bypass valve 5 of hydraulic oil temperature control system of the present invention can be polytype, and it is not limited to two types and the Placement thereof of the following stated, as long as can coordinate with controller 1, according to the pressure and temperature detected, realize cut-offfing of bypass valve.
The first type of bypass valve 5:
In the type, bypass valve 5 is electromagnetism bypass valve 9, and electromagnetism bypass valve 9 is electrically connected with controller 1.Now, pressure-detecting device 8 can select pressure switch.
Particularly, as shown in Figure 2, in the preferred oil passage connection structure of one, the filler opening of electromagnetism bypass valve 9 is connected with the filler opening of oil cooler 3, community receiving system oil return, the oil outlet of electromagnetism bypass valve 9 is all connected with fuel tank 16 with the oil outlet of oil cooler 3, the input end of pressure switch 8 is connected with the entrance of oil cooler 3, the output terminal of pressure switch 8 is connected with the first input end of controller 1, the input end of oil temperature sensor 2 is connected with fuel tank 16, the output terminal of oil temperature sensor 2 is connected with the second input end of controller 1, first output terminal of controller 1 is connected with the control end of electromagnetism bypass valve 9.
Like this, when oil temperature T1 is greater than the optimum temperature value T and pressure switch disconnection that preset, controller 1 not output current, electromagnetism bypass valve 9 cuts out bleed off circuit, system oil return is all by oil sump tank after oil cooler cooling, give full play to the heat dispersion of oil cooler, reach the object controlling high oil temperature.
And the pressure P 1 working as oil cooler ingress is greater than the pressure value P of this pressure switch setting, this pressure switch is closed, or when oil temperature T1 is less than the optimum temperature value T preset, controller output current, electromagnetism bypass valve obtains electric transposition makes bleed off circuit open, a system oil return part flows through the direct oil sump tank of bypass valve, and a part flows through the rear oil sump tank of oil cooler cooling, reaches and controls the too low object of oil temperature.
Certainly, when pressure-detecting device 8 selects pressure transducer, the pressure value P by controller and setting compares by its real-time pressure value P 1 detected.
The second type of bypass valve 5:
As shown in Figure 1, in the type, bypass valve 5 is hydraulic control bypass valve 10, and meanwhile, controller 1 is electrically connected with pilot solenoid valve 11, and this pilot solenoid valve 11 is communicated in hydraulic power 7 by pioneer pump 12; Preferably, this hydraulic power 7 is fuel tank 16; When the spool of pilot solenoid valve 11 is in primary importance, the control port 13 of hydraulic control bypass valve 10 is communicated with the return opening of pilot solenoid valve 11, when the spool of pilot solenoid valve 11 is in the second place, the control port 13 of hydraulic control bypass valve 10 is communicated with the oil outlet of pilot solenoid valve 11.Now, pressure-detecting device 8 can select pressure switch equally.
Like this, when the oil temperature T1 detected is greater than the optimum temperature value T preset, and when pressure switch 8 disconnects, controller 1 not output current, pilot solenoid valve 11 is in primary importance under the effect of own spring force, the control port 13 of hydraulic control bypass valve 10 is communicated with the return opening of pilot solenoid valve 11, the return opening of pilot solenoid valve 11 is communicated with fuel tank 16, now, hydraulic control bypass valve 10 cuts out bleed off circuit, system oil return all by oil sump tank after oil cooler cooling, gives full play to the heat dispersion of oil cooler, reaches the object controlling high oil temperature.
And the pressure P 1 working as oil cooler ingress is greater than the pressure value P of this pressure switch setting, this pressure switch is closed, or when oil temperature T1 is less than the optimum temperature value T preset, controller 1 output current, pilot solenoid valve 11 obtains electric transposition and is in the second place, the control port 13 of hydraulic control bypass valve 10 is communicated with the oil outlet of pilot solenoid valve 11, the filler opening of pilot solenoid valve 11 is then connected with pioneer pump 12, hydraulic control bypass valve 10 replaces and opens bleed off circuit under the effect of pilot pressure oil, a part for system oil return flows through the direct oil sump tank of hydraulic control bypass valve, and another part flow through oil cooler cool after oil sump tank, reach and control the too low object of oil temperature.
Certainly, when pressure-detecting device 8 selects pressure transducer, the pressure value P by controller and setting compares by its real-time pressure value P 1 detected.
In addition, as shown in Figure 1, the outlet port of pioneer pump 12 is communicated with precursor overflow valve 14, and the oil outlet of this precursor overflow valve 14 is communicated with fuel tank 16.
In addition; real-time process is carried out for the ease of operator; preferably; controller 1 is electrically connected with monitoring unit 15; monitoring unit 15 is for showing the real time information of this system; such as, raise if oil cooler inlet pressure is abnormal, then pressure switch closes; after controller receives the electrical signal of pressure switch output; control bypass valve is opened, and is oil cooler shunting, alleviates the inlet pressure of oil cooler; protection oil cooler; export electrical signal to monitoring unit, " oil cooler blocks, and please shut down process in display on a monitor simultaneously.”
In addition, the specific embodiment of the present invention also provides a kind of hydraulic fluid temperature controlling method, and this hydraulic fluid temperature controlling method comprises:
Detect the oil temperature of oil supply source, and compare detecting the oil temperature T1 obtained with set temperature value T;
As T1 ﹤ T, the direct oil return of a part of hydraulic oil-returning is to described oil supply source, and after another part cooling, oil return is to described oil supply source;
As T1>T, after described hydraulic oil-returning cooling, oil return is to described oil supply source;
Detect the pressure P 1 of the described hydraulic oil-returning before cooling, when the pressure value P of pressure P 1> setting, the direct oil return of a part of described hydraulic oil-returning is to described oil supply source, and after another part cooling, oil return is to described oil supply source.
Like this; the method compares the mode comparatively combined with pressure ratio by temperature; can environmentally temperature select corresponding control mode with the temperature of regulator solution force feed, and the hydraulic system components to this hydraulic oil, particularly oil cooler carry out good protection.
Certainly, should be understood that, the method can be realized by above-described hydraulic oil temperature control system, also can be realized by other temperature control system.
Further, in order to ensure stability and Security, in the method, comparatively the control of described hydraulic oil-returning is had precedence over according to temperature relatively to the control of described hydraulic oil-returning according to pressure ratio.Like this, such as, when hydraulic oil temperature control system starts operation, first by the pressure in the system oil return road 6 of pressure-detecting device 8 pairs of oil cooler 3 upstreams, preferably the pressure of oil cooler 3 ingress is detected, if the pressure P detected 1 is greater than the pressure value P of default, then controller 1 controls bypass valve and opens, make a part for hydraulic oil-returning by the direct oil return of bypass valve to described oil supply source, such as fuel tank, another part is by oil return after oil cooler cooling, subsequently, in the operation process of this hydraulic oil temperature control system, as long as the pressure P detected 1 is greater than the pressure value P of default, control bypass valve is opened by controller 1, thus to system unit, particularly oil cooler plays further protective action.
Fluctuate up and down in optimum temperature value in order to avoid hydraulic fluid temperature and cause bypass valve frequently to open and close, this system is caused to shake, preferably, in the method, at interval of the temperature allocating time cycle, just carry out comparing of oil temperature T1 and set temperature value T.Like this, in this temperature allocating time cycle t, this hydraulic oil temperature control system will be in stable state.
Further, in order to avoid in this temperature allocating time cycle t, oil temperature rises to higher temperature, preferably, within the described temperature allocating time cycle, oil return after the part cooling of described hydraulic oil-returning, such as, the connection position of bypass valve 5 can be provided with throttle orifice.Like this, by this throttle orifice, a part of hydraulic oil-returning can be forced to be dispelled the heat by oil cooler, thus avoid in temperature allocating time cycle t, the oil temperature detected due to never call oil temperature detection device and the high oil temperature caused.
Like this; the present invention is by above-described hydraulic oil temperature control system and/or hydraulic fluid temperature controlling method; combine with temperature by adopting pressure; the mode that preferably Stress control is preferential; can when ambient temperature be higher; close bleed off circuit; give full play to the heat dissipation potential of oil cooler; and in system warm-up process; open bleed off circuit, thus substantially reduce preheat time, thus can hydraulic oil temperature be controlled at optimum value annex in time; and can to the parts of system, particularly oil cooler is protected timely and effectively.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. a hydraulic oil temperature control system, comprise be connected on oil cooler (3) in system oil return road and with the bypass valve (5) that this oil cooler (3) is connected in parallel, it is characterized in that, also comprise:
For detecting the oil temperature detection device (2) of hydraulic fluid temperature in the oil circuit of described oil cooler (3) downstream;
For detecting the pressure-detecting device (8) of hydraulic fluid pressure in the oil circuit of described oil cooler (3) upstream; And
Controller (1);
Wherein, described oil temperature detection device (2) and pressure-detecting device (8) are electrically connected on described controller (1), the temperature signal that described controller (1) inputs according to described oil temperature detection device (2) and pressure-detecting device (8) and pressure signal control the aperture of described bypass valve (5), thus the hydraulic oil controlled in described system oil return road selectively to flow through after described oil cooler oil return or by described bypass valve oil return.
2. hydraulic oil temperature control system according to claim 1, it is characterized in that, described controller (1) has precedence over the temperature signal that inputs according to described oil temperature detection device (2) to the control of described bypass valve (5) according to the control of pressure signal to described bypass valve (5) that described pressure-detecting device (8) inputs.
3. hydraulic oil temperature control system according to claim 1, is characterized in that, described controller (1) is set as just calling once at interval of the temperature allocating time cycle temperature signal that described oil temperature detection device (2) inputs.
4. hydraulic oil temperature control system according to claim 3, is characterized in that, the connection position of described bypass valve (5) is provided with throttle orifice.
5. according to the hydraulic oil temperature control system in claim 1-4 described in any one, it is characterized in that, described bypass valve (5) is electromagnetism bypass valve (9), and this electromagnetism bypass valve (9) is electrically connected with described controller (1).
6. according to the hydraulic oil temperature control system in claim 1-4 described in any one, it is characterized in that, described bypass valve (5) is hydraulic control bypass valve (10), described controller (1) is electrically connected with pilot solenoid valve (11), and this pilot solenoid valve (11) is communicated in hydraulic power (7) by pioneer pump (12);
When the spool of described pilot solenoid valve (11) is in primary importance, the control port (13) of described hydraulic control bypass valve (10) is communicated with the return opening of described pilot solenoid valve (11), when the spool of described pilot solenoid valve (11) is in the second place, the control port (13) of described hydraulic control bypass valve (10) is communicated with the oil outlet of described pilot solenoid valve (11).
7. hydraulic oil temperature control system according to claim 1, is characterized in that, described controller (1) is electrically connected with monitoring unit (15).
8. a hydraulic fluid temperature controlling method, is characterized in that, the method comprises:
Detect the oil temperature of oil supply source, and compare detecting the oil temperature T1 obtained with set temperature value T;
As T1 ﹤ T, the direct oil return of a part of hydraulic oil-returning is to described oil supply source, and after another part cooling, oil return is to described oil supply source;
As T1>T, after described hydraulic oil-returning cooling, oil return is to described oil supply source;
Detect the pressure value P 1 of the described hydraulic oil-returning before cooling, when the pressure value P of pressure value P 1> setting, the direct oil return of a part of described hydraulic oil-returning is to described oil supply source, and after another part cooling, oil return is to described oil supply source.
9. hydraulic fluid temperature controlling method according to claim 8, is characterized in that, comparatively has precedence over according to temperature relatively to the control of described hydraulic oil-returning the control of described hydraulic oil-returning according to pressure ratio.
10. hydraulic fluid temperature controlling method according to claim 8, is characterized in that, at interval of the temperature allocating time cycle, just carries out comparing of oil temperature T1 and set temperature value T.
11. hydraulic fluid temperature controlling methods according to claim 10, is characterized in that, within the described temperature allocating time cycle, and oil return after the part cooling of described hydraulic oil-returning.
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| CN201410527269.5A CN104454801A (en) | 2014-10-09 | 2014-10-09 | Hydraulic oil temperature control system and method |
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| CN107165894A (en) * | 2017-07-03 | 2017-09-15 | 山推工程机械股份有限公司 | A kind of Oil-temperature control system and hydraulic system of bulldozer |
| CN108564869A (en) * | 2018-06-06 | 2018-09-21 | 北京理工大学 | A kind of temperature control experiments device, temperature-rising method and cooling means for teaching |
| CN111520377A (en) * | 2020-05-19 | 2020-08-11 | 上海三一重机股份有限公司 | Hydraulic heat dissipation control system, method, device, equipment and engineering machinery |
| CN112268038A (en) * | 2020-10-19 | 2021-01-26 | 江苏徐工工程机械研究院有限公司 | Novel hydraulic oil cooling system |
| CN113118228A (en) * | 2021-05-10 | 2021-07-16 | 大昌汽车部件股份有限公司 | Cold extrusion processing device for piston and control method thereof |
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