CN111520367A - Electric control hydraulic system of hydraulic suspension device, tractor and active damping control method - Google Patents
Electric control hydraulic system of hydraulic suspension device, tractor and active damping control method Download PDFInfo
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- CN111520367A CN111520367A CN202010500692.1A CN202010500692A CN111520367A CN 111520367 A CN111520367 A CN 111520367A CN 202010500692 A CN202010500692 A CN 202010500692A CN 111520367 A CN111520367 A CN 111520367A
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- 239000000725 suspension Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000013016 damping Methods 0.000 title claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- 230000007704 transition Effects 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000004043 responsiveness Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 162
- 230000035939 shock Effects 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 241001236644 Lavinia Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
- A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
- A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
- A01B63/1006—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means the hydraulic or pneumatic means structurally belonging to the tractor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B71/00—Construction or arrangement of setting or adjusting mechanisms, of implement or tool drive or of power take-off; Means for protecting parts against dust, or the like; Adapting machine elements to or for agricultural purposes
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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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Lifting Devices For Agricultural Implements (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses an electric control hydraulic system of a hydraulic suspension device, a tractor using the system and a control method for actively damping hitching farm implements by using the system, wherein a first overflow pressure maintaining branch oil way and a second overflow pressure maintaining branch oil way are arranged between a first working oil way and a second working oil way, the first overflow pressure maintaining branch oil way and the second overflow pressure maintaining branch oil way are provided with electric control switch valves, the first overflow pressure maintaining branch oil way comprises a first overflow pressure maintaining valve, and the opening pressure of the first overflow pressure maintaining valve is not less than the pressure of the hitching farm implements on a first working oil port when the electric control hydraulic valve is in a neutral state; and the second overflow pressure-maintaining branch oil way comprises a second overflow pressure-maintaining valve. Compared with the prior art, the electric control hydraulic system, the tractor and the control method disclosed by the invention reduce the responsiveness requirements on the electric control unit and the electric control hydraulic valve, and improve the active damping effect on the articulated agricultural implement.
Description
Technical Field
The invention relates to the technical field of hydraulic suspension devices of agricultural equipment, in particular to an electric control hydraulic system of a hydraulic suspension device capable of actively damping hitched farm implements in transition operation, a tractor using the electric control hydraulic system and a control method for actively damping the hitched farm implements by adopting the electric control hydraulic system.
Background
A hydraulic suspension device of agricultural equipment (such as a tractor) is used for hanging a suspension type or semi-suspension type farm tool, carrying out farm tool lifting and tilling depth adjustment, realizing driving wheel loading, hydraulic power output and the like. The hydraulic suspension device consists of a hydraulic system and a suspension mechanism, wherein the hydraulic system comprises an oil pump, a distributor, a lifting oil cylinder, an oil cylinder control mechanism and the like, and the suspension mechanism comprises an upper pull rod, a lower pull rod, a lifting arm and the like. The farm tool can be raised, lowered, neutral and floated by operating the distributor, so that the tractor has the functions of position control, force control and force-position comprehensive control.
The known electric control hydraulic suspension device upgrades the original manually controlled hydraulic system into an electric control hydraulic system through a force sensor (used for detecting the tension information born by a lower pull rod or an upper pull rod), a position sensor (used for detecting the position information of a lifting arm), an electric control unit and the like, thereby realizing the automation and the intellectualization of the farm tool operation.
When a tractor is connected with farm tools (such as ploughs) for transition operation, the tractor vibrates along with the road jolt, and the interaction between the farm tools and the tractor body can aggravate the vibration of the tractor due to the large overall dimension of the farm tools, thereby causing negative effects on the physical and mental health of a driver, the service life of the tractor and the like.
With the application of the electric control hydraulic system in the hydraulic suspension device, active shock absorption of the hitching farm tool (such as a cultivator) in the transition process becomes possible. The basic principle of shock absorption is that the vertical motion of the lifting oil cylinder is used for compensating the vertical shock of the articulated farm implement, when the tractor starts to shock due to the reason of the road surface, the electric control unit collects the information of the force sensor and the position sensor, the shock amplitude and the direction of the farm implement are judged, and the electric control hydraulic valve is used for charging or discharging oil to the rod cavity and the rodless cavity of the lifting oil cylinder, so that the lifting oil cylinder generates displacement opposite to the shock direction, and the shock of the articulated farm implement is reduced. This has proposed very high requirement to the responsiveness of automatically controlled unit and automatically controlled hydrovalve, and in the application, there is the action lag problem in the lift cylinder, seriously influences the shock attenuation effect.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, a first technical problem to be solved by the present invention is to provide an electrically controlled hydraulic system of a hydraulic suspension device, so as to reduce the responsiveness requirements on an electrically controlled unit and an electrically controlled hydraulic valve and improve the active damping effect on the hitched farm implement.
The second technical problem to be solved by the invention is to provide a tractor adopting the electric control hydraulic system of the hydraulic suspension device.
The invention provides a control method for actively damping the hitching farm tool by using the electric control hydraulic system of the hydraulic suspension device.
In order to solve the first technical problem, the invention adopts the technical scheme that:
an electro-hydraulic system for a hydraulic suspension, comprising: the hydraulic lifting device comprises an oil pump, a lifting oil cylinder and an electric control hydraulic valve, wherein the oil pump, a cylinder body of the lifting oil cylinder and the electric control hydraulic valve are arranged on a traction agricultural equipment, a piston rod of the lifting oil cylinder is hinged to a lifting arm, the electric control hydraulic valve is provided with a pressure oil port, a first working oil port and a second working oil port, the first working oil port is communicated with a rodless cavity of the lifting oil cylinder through a first working oil path, the second working oil port is communicated with a rod cavity of the lifting oil cylinder through a second working oil path, and the pressure oil port is communicated with a main oil path; the force sensor is used for detecting tension information borne by the lower pull rod or the upper pull rod; a position sensor for detecting position information of the lifting arm; the force sensor, the position sensor and the electric control hydraulic valve are respectively and electrically connected with an electric control unit; a first overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rodless cavity of the lifting oil cylinder and a second overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rod cavity of the lifting oil cylinder are arranged between the first working oil path and the second working oil path, and the first overflow pressure maintaining branch oil path and the second overflow pressure maintaining branch oil path are provided with electric control switch valves; the first overflow pressure-maintaining branch oil path comprises a first overflow pressure-maintaining valve, and the opening pressure of the first overflow pressure-maintaining valve is not less than the pressure of the articulated farm tool on the first working oil port when the electric control hydraulic valve is in a neutral state; and the second overflow pressure-maintaining branch oil way comprises a second overflow pressure-maintaining valve.
Wherein, the electric control switch valve is a normally closed electric control switch valve.
And the first overflow pressure maintaining branch oil path and the second overflow pressure maintaining branch oil path are controlled to be on or off only through one electric control switch valve.
And the first overflow pressure maintaining branch oil way and the second overflow pressure maintaining branch oil way are respectively provided with a throttling valve.
Wherein the traction agricultural equipment comprises a tractor.
In order to solve the second technical problem, the invention adopts the technical scheme that:
the tractor is provided with a hydraulic suspension device, and the hydraulic suspension device adopts the electric control hydraulic system.
In order to solve the third technical problem, the invention adopts the technical scheme that:
a control method for actively damping hitching agricultural implements adopts an electric control hydraulic system of the hydraulic suspension device, and comprises the following steps:
1) the hydraulic suspension device for the traction agricultural equipment is used for hanging agricultural implements, a transition operation mode is started, and the electric control switch valve is in a switching-on state through the electric control unit;
2) automatic oil filling step
The vibration generated by road bumping is transmitted to the lifting oil cylinder from the traction agricultural equipment, so that the cylinder body of the lifting oil cylinder instantly moves upwards relative to the piston rod of the lifting oil cylinder, high-pressure oil is generated in the rodless cavity of the lifting oil cylinder, the high-pressure oil automatically flows to the rod cavity of the lifting oil cylinder through a first overflow pressure-maintaining branch oil way, and the upward vibration amplitude of the hitching agricultural implement connected with the lifting arm is smaller than the upward vibration amplitude of the traction agricultural equipment connected with the cylinder body of the lifting oil cylinder; meanwhile, the electric control unit collects the tension information of the force sensor and judges the oil charge amount to the lifting oil cylinder according to the tension information; or
The vibration generated by road bumping is transmitted to the lifting oil cylinder from the traction agricultural equipment, so that the cylinder body of the lifting oil cylinder instantly descends relative to the piston rod of the lifting oil cylinder, high-pressure oil is generated in the rod cavity of the lifting oil cylinder, the high-pressure oil automatically flows to the rodless cavity of the lifting oil cylinder through a second overflow pressure-maintaining branch oil way, and the downward vibration amplitude of the hitching agricultural implement connected with the lifting arm is smaller than the downward vibration amplitude of the traction agricultural equipment connected with the cylinder body of the lifting oil cylinder; meanwhile, the electric control unit collects the tension information of the force sensor and judges the oil charge amount to the lifting oil cylinder according to the tension information;
3) electrically controlled oil filling step
When the automatic oil filling step is close to the end, the electric control unit further acquires the position information of the position sensor and the tension information of the force sensor, and corrects the previously determined oil filling amount of the lifting oil cylinder according to the further acquired position information and tension information and starts the electric control hydraulic valve; when the automatic oil filling step is finished, immediately filling oil into a rodless cavity of the lifting oil cylinder by the high-pressure oil of the main oil way through the electric control hydraulic valve, and simultaneously returning oil and releasing pressure of a rod cavity of the lifting oil cylinder until the relative position of a piston rod of the lifting oil cylinder and a cylinder body of the lifting oil cylinder returns to the initial position; or
When the automatic oil filling step is close to the end, the electric control unit further acquires the position information of the position sensor and the tension information of the force sensor, and corrects the previously determined oil filling amount of the lifting oil cylinder according to the further acquired position information and tension information and starts the electric control hydraulic valve; when the automatic oil filling step is finished, immediately filling oil into a rod cavity of the lifting oil cylinder by the high-pressure oil of the main oil way through the electric control hydraulic valve, and simultaneously returning oil and releasing pressure of a rodless cavity of the lifting oil cylinder until the relative position of a piston rod of the lifting oil cylinder and a cylinder body of the lifting oil cylinder returns to the initial position;
4) when the road jolts and generates continuous vibration, the corresponding steps are repeated.
After the technical scheme is adopted, the technical effects obtained by the invention are as follows:
when the traction agricultural equipment (tractor) hung with agricultural implements starts to transition operation, the vibration generated by bumpy road surface can make the cylinder body and the piston rod of the lifting oil cylinder instantaneously generate relative motion, so that high-pressure oil is generated in a rodless cavity or a rod cavity, and because a first overflow pressure-maintaining branch oil way and a second overflow pressure-maintaining branch oil way are arranged between the first working oil way and the second working oil way, the high-pressure oil can automatically flow to the other cavity of the lifting oil cylinder through the first overflow pressure-maintaining branch oil way or the second overflow pressure-maintaining branch oil way, so that the vibration amplitude of the articulated agricultural implements is smaller than that of the traction agricultural equipment, and active damping is realized; in the automatic oil filling step, an electric control hydraulic valve is not needed, so that the response hysteresis phenomenon does not exist; before the automatic oil filling step is finished, the electric control hydraulic valve can be started in advance, and when the automatic oil filling step is finished, hydraulic oil can be immediately supplemented from the main oil circuit to the cavity of the high-pressure oil flowing out through the electric control hydraulic valve.
Drawings
FIG. 1 is a schematic structural view of an embodiment of the tractor provided with a hydraulic hitch of the present invention;
FIG. 2 is a hydraulic schematic diagram of a portion of the electrically controlled hydraulic system of FIG. 1 implementing the auto-fill function;
in the figure: 100-tractor, 201-oil tank, 202-oil pump, 203-electric control hydraulic valve, 204-electric control unit, 205-lifting arm, 206-lifting oil cylinder, 207-lower pull rod, 208-force sensor, 209-upper pull rod, 210-position sensor, 211-tail button, 212-electric control switch valve, 213-first overflow pressure retaining valve, 214-throttle valve, 215-throttle valve, 216-second overflow pressure retaining valve, 300-farm tool, A-first working oil port, B-second working oil port and P-pressure oil port.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, a hydraulic suspension device is provided at the rear of the tractor 100, by which the tractor 100 hitches the implement 300. The hydraulic suspension device comprises a suspension mechanism and an electric control hydraulic system.
The suspension mechanism comprises a lower pull rod 207, an upper pull rod 209, a lifting arm 205 and the like, wherein the lower pull rod 207 and the upper pull rod 209 are used for being connected with the farm tool 300, the lifting arm 205 is used for being connected with the lower pull rod 207, and the farm tool 300 is lifted and descended through the swinging of the lifting arm 205.
The electric control hydraulic system comprises an oil tank 201, an oil pump 202, an electric control hydraulic valve 203, an electric control unit 204, a lifting oil cylinder 206, a force sensor 208, a position sensor 210, a tail button 211 and the like. The cylinder body of the lift cylinder 206 is mounted to the tractor 100, and the piston rod of the lift cylinder 206 is hinged to the lift arm 205. The force sensor 208 is disposed on the lower link 207 for detecting the tension information received by the lower link 207, but may be disposed on the upper link. The position sensor 210 is used to detect position information of the lifting arm 205. The electric control hydraulic valve 203 is used for providing hydraulic oil for the lifting oil cylinder 206 or returning oil for pressure relief, and when the lifting oil cylinder 206 is in a neutral state, a rod cavity and a rodless cavity of the lifting oil cylinder 206 are both sealed by the electric control hydraulic valve 203; the electrically controlled hydraulic valve 203 is provided with a pressure port P, a first working port a and a second working port B, the first working port a is communicated with the rodless cavity of the lift cylinder 206 through a first working oil path, the second working port B is communicated with the rod cavity of the lift cylinder 206 through a second working oil path, and the pressure port P is communicated with the main oil path. The tail button 211 is used to activate the electro-hydraulic system. The electric control hydraulic valve 203, the force sensor 208, the position sensor 210 and the tail button 211 are all electrically connected with the electric control unit 204, and the electric control unit 204 receives relevant information of the force sensor 208 and the position sensor 210, processes the information and sends an instruction to the electric control hydraulic valve 203. These structures and principles are well known to those of ordinary skill in the art and will not be described in detail herein.
The contribution of the invention to the prior art is mainly reflected in that the electric control hydraulic system reduces the responsiveness requirements on the electric control unit and the electric control hydraulic valve and improves the active damping effect on the articulated farm tool. As shown in fig. 2, a first overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rodless cavity of the lift cylinder 206 and a second overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rod cavity of the lift cylinder 206 are provided between the first working oil path and the second working oil path, the first overflow pressure maintaining branch oil path and the second overflow pressure maintaining branch oil path are provided with an electrically controlled switch valve 212, preferably, the electrically controlled switch valve 212 is a normally closed electrically controlled switch valve, and the first overflow pressure maintaining branch oil path and the second overflow pressure maintaining branch oil path are controlled to be on or off by only one electrically controlled switch valve 212.
The first overflow pressure maintaining branch oil path is provided with a first overflow pressure maintaining valve 213 and a throttle valve 214, and the opening pressure of the first overflow pressure maintaining valve 213 is not less than the pressure of the hitching farm tool 300 to the first working oil port a when the electrically controlled hydraulic valve 203 is in the neutral state. The second overflow pressure-maintaining branch oil path is provided with a second overflow pressure-maintaining valve 216 and a throttle valve 215. The size of the throttle valve is adjusted, the oil filling rate can be adjusted, and the damping amplitude is controlled not to exceed the rated size, so that accidents are avoided.
The control method for actively damping the hitching farm tool by using the electric control hydraulic system of the hydraulic suspension device comprises the following steps:
1) the tractor 100 uses the hydraulic suspension device to hang the farm implement 300, and when the transition operation mode is started, the electric control switch valve 212 is in an electrified and opened state through the electric control unit 204. Of course, the electronically controlled on-off valve 212 needs to be de-energized to close when the tractor is in the tilling mode.
2) Automatic oil filling step
The vibration generated by the road bump is transmitted from the tractor 100 to the lift cylinder 206, so that the cylinder body of the lift cylinder 206 generates relative movement with respect to the piston rod, and the relative movement is divided into two conditions, namely, an instant upward movement and an instant downward movement.
Firstly, when the cylinder body of the lifting cylinder 206 instantly moves upwards relative to the piston rod, high-pressure oil is generated in a rodless cavity of the lifting cylinder 206 and automatically flows to a rod cavity of the lifting cylinder 206 through a first overflow pressure-maintaining branch oil way, so that the upward vibration amplitude of the hitching farm tool 300 connected with the lifting arm 205 is smaller than the upward vibration amplitude of the tractor 100 connected with the cylinder body of the lifting cylinder 206; meanwhile, the electronic control unit 204 collects the tension information of the force sensor 208, and determines the oil charge amount to the lift cylinder 206 according to the tension information, and at this time, the oil is not charged temporarily.
When the cylinder body of the lifting cylinder 206 instantaneously descends relative to the piston rod, high-pressure oil is generated in the rod cavity of the lifting cylinder 206 and automatically flows to the rodless cavity of the lifting cylinder 206 through the second overflow pressure-maintaining branch oil way, so that the downward vibration amplitude of the hitching farm tool 300 connected with the lifting arm 205 is smaller than the downward vibration amplitude of the tractor connected with the cylinder body of the lifting cylinder 206; meanwhile, the electronic control unit 204 collects the tension information of the force sensor 208, and determines the oil charge amount to the lift cylinder 206 according to the tension information, and at this time, the oil is not charged temporarily.
3) Electrically controlled oil filling step
Aiming at the condition that the cylinder body of the lifting oil cylinder 206 ascends relative to the piston rod instantly, when the automatic oil filling step is close to the end, the electric control unit 204 further acquires the position information of the position sensor 210 and the tension information of the force sensor 208, and the electric control unit 204 corrects the previously determined oil filling amount of the lifting oil cylinder according to the further acquired position information and tension information and starts the electric control hydraulic valve 203; when the automatic oil filling step is finished, the high-pressure oil of the main oil way is immediately filled into the rodless cavity of the lifting oil cylinder 206 through the electric control hydraulic valve 203, and meanwhile, the oil returning and pressure relief of the rod cavity of the lifting oil cylinder 206 are realized until the relative position of the piston rod and the cylinder body of the lifting oil cylinder 206 returns to the initial position, namely the position sensor 210 returns to the value before vibration.
For the situation that the cylinder body of the lifting oil cylinder 206 descends instantaneously relative to the piston rod, when the automatic oil filling step is close to the end, the electronic control unit 204 further acquires the position information of the position sensor 210 and the tension information of the force sensor 208, and the electronic control unit 204 corrects the previously determined oil filling amount of the lifting oil cylinder according to the further acquired position information and tension information and starts the electronic control hydraulic valve 203; and when the automatic oil filling step is finished, immediately filling oil into the rod cavity of the lifting oil cylinder by the high-pressure oil of the main oil way through the electric control hydraulic valve 203, and simultaneously returning oil and releasing pressure to the rodless cavity of the lifting oil cylinder until the relative position of the piston rod of the lifting oil cylinder 206 and the cylinder body returns to the initial position.
4) When the road jolts and generates continuous vibration, the corresponding steps are repeated.
In the invention, the traction agricultural equipment is not limited to a tractor, but also can be other agricultural equipment such as a rice transplanter and the like.
The present invention is not limited to the embodiments described above, and all modifications that can be made based on the concept, principle, structure and method of the present invention will fall within the scope of the present invention.
Claims (10)
1. An electro-hydraulic system for a hydraulic suspension, comprising:
the hydraulic lifting device comprises an oil pump, a lifting oil cylinder and an electric control hydraulic valve, wherein a cylinder body of the oil pump, the lifting oil cylinder and the electric control hydraulic valve are arranged on a traction agricultural equipment, a piston rod of the lifting oil cylinder is hinged to a lifting arm, the electric control hydraulic valve is provided with a pressure oil port (P), a first working oil port (A) and a second working oil port (B), the first working oil port (A) is communicated with a rodless cavity of the lifting oil cylinder through a first working oil path, the second working oil port (B) is communicated with a rod cavity of the lifting oil cylinder through a second working oil path, and the pressure oil port (P) is communicated with a main oil path;
the force sensor is used for detecting tension information borne by the lower pull rod or the upper pull rod;
a position sensor for detecting position information of the lifting arm;
the force sensor, the position sensor and the electric control hydraulic valve are respectively and electrically connected with an electric control unit; it is characterized in that the preparation method is characterized in that,
a first overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rodless cavity of the lifting oil cylinder and a second overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rod cavity of the lifting oil cylinder are arranged between the first working oil path and the second working oil path, and the first overflow pressure maintaining branch oil path and the second overflow pressure maintaining branch oil path are provided with electric control switch valves;
the first overflow pressure-maintaining branch oil path comprises a first overflow pressure-maintaining valve, and the opening pressure of the first overflow pressure-maintaining valve is not less than the pressure of the articulated farm tool on the first working oil port (A) when the electric control hydraulic valve is in a neutral state;
and the second overflow pressure-maintaining branch oil way comprises a second overflow pressure-maintaining valve.
2. An electrically controlled hydraulic system for a hydraulic suspension as claimed in claim 1, wherein said electrically controlled on-off valve is a normally closed electrically controlled on-off valve.
3. The electrically controlled hydraulic system of a hydraulic suspension system according to claim 1, wherein the first relief pressure holding branch oil passage and the second relief pressure holding branch oil passage are on-off controlled by only one of the electrically controlled switch valves.
4. The electrically controlled hydraulic system of a hydraulic suspension system according to claim 1, wherein the first and second relief pressure holding branch oil passages are provided with a throttle valve, respectively.
5. An electro-hydraulic system for a hydraulic hitch as claimed in any one of claims 1 to 4, wherein the towing vehicle comprises a tractor.
6. A tractor characterized in that it is provided with a hydraulic hitch, which employs an electrically controlled hydraulic system according to claim 1, said tractor being said tractor.
7. A method of controlling active damping of a hitching implement, characterized in that an electrically controlled hydraulic system employing the hydraulic suspension of claim 1, comprises the steps of:
1) the hydraulic suspension device for the traction agricultural equipment is used for hanging agricultural implements, a transition operation mode is started, and the electric control switch valve is in a switching-on state through the electric control unit;
2) automatic oil filling step
The vibration generated by road bumping is transmitted to the lifting oil cylinder from the traction agricultural equipment, so that the cylinder body of the lifting oil cylinder instantly moves upwards relative to the piston rod of the lifting oil cylinder, high-pressure oil is generated in the rodless cavity of the lifting oil cylinder, the high-pressure oil automatically flows to the rod cavity of the lifting oil cylinder through a first overflow pressure-maintaining branch oil way, and the upward vibration amplitude of the hitching agricultural implement connected with the lifting arm is smaller than the upward vibration amplitude of the traction agricultural equipment connected with the cylinder body of the lifting oil cylinder; meanwhile, the electric control unit collects the tension information of the force sensor and judges the oil charge amount to the lifting oil cylinder according to the tension information; or
The vibration generated by road bumping is transmitted to the lifting oil cylinder from the traction agricultural equipment, so that the cylinder body of the lifting oil cylinder instantly descends relative to the piston rod of the lifting oil cylinder, high-pressure oil is generated in the rod cavity of the lifting oil cylinder, the high-pressure oil automatically flows to the rodless cavity of the lifting oil cylinder through a second overflow pressure-maintaining branch oil way, and the downward vibration amplitude of the hitching agricultural implement connected with the lifting arm is smaller than the downward vibration amplitude of the traction agricultural equipment connected with the cylinder body of the lifting oil cylinder; meanwhile, the electric control unit collects the tension information of the force sensor and judges the oil charge amount to the lifting oil cylinder according to the tension information;
3) electrically controlled oil filling step
When the automatic oil filling step is close to the end, the electric control unit further acquires the position information of the position sensor and the tension information of the force sensor, and corrects the previously determined oil filling amount of the lifting oil cylinder according to the further acquired position information and tension information and starts the electric control hydraulic valve; when the automatic oil filling step is finished, immediately filling oil into a rodless cavity of the lifting oil cylinder by the high-pressure oil of the main oil way through the electric control hydraulic valve, and simultaneously returning oil and releasing pressure of a rod cavity of the lifting oil cylinder until the relative position of a piston rod of the lifting oil cylinder and a cylinder body of the lifting oil cylinder returns to the initial position; or
When the automatic oil filling step is close to the end, the electric control unit further acquires the position information of the position sensor and the tension information of the force sensor, and corrects the previously determined oil filling amount of the lifting oil cylinder according to the further acquired position information and tension information and starts the electric control hydraulic valve; when the automatic oil filling step is finished, immediately filling oil into a rod cavity of the lifting oil cylinder by the high-pressure oil of the main oil way through the electric control hydraulic valve, and simultaneously returning oil and releasing pressure of a rodless cavity of the lifting oil cylinder until the relative position of a piston rod of the lifting oil cylinder and a cylinder body of the lifting oil cylinder returns to the initial position;
4) when the road jolts and generates continuous vibration, the corresponding steps are repeated.
8. The method of claim 7, wherein the electrically controlled on-off valve is a normally closed electrically controlled on-off valve.
9. The method of claim 7, wherein the first and second branch relief and pressure maintaining oil passages are on-off controlled by only one electrically controlled on-off valve.
10. The method of claim 7, wherein the first and second branch relief and hold oil passages are each provided with a throttle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010500692.1A CN111520367A (en) | 2020-06-04 | 2020-06-04 | Electric control hydraulic system of hydraulic suspension device, tractor and active damping control method |
| PCT/CN2021/070621 WO2021244031A1 (en) | 2020-06-04 | 2021-01-07 | Electronically controlled hydraulic system of hydraulic suspension device, tractor and active damping control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010500692.1A CN111520367A (en) | 2020-06-04 | 2020-06-04 | Electric control hydraulic system of hydraulic suspension device, tractor and active damping control method |
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| CN111520367A true CN111520367A (en) | 2020-08-11 |
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|---|---|---|---|
| CN202010500692.1A Pending CN111520367A (en) | 2020-06-04 | 2020-06-04 | Electric control hydraulic system of hydraulic suspension device, tractor and active damping control method |
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| Country | Link |
|---|---|
| CN (1) | CN111520367A (en) |
| WO (1) | WO2021244031A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021244031A1 (en) * | 2020-06-04 | 2021-12-09 | 博鼎精工智能科技(山东)有限公司 | Electronically controlled hydraulic system of hydraulic suspension device, tractor and active damping control method |
| WO2022062277A1 (en) | 2020-09-22 | 2022-03-31 | 博鼎精工智能科技(山东)有限公司 | Intelligent control system of hydraulic hitch device |
| CN114793515A (en) * | 2022-02-18 | 2022-07-29 | 潍柴雷沃重工股份有限公司 | Vibration reduction method, device, system, equipment and medium of tractor and tractor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005039251A1 (en) * | 2005-08-19 | 2007-02-22 | Deere & Company, Moline | charger |
| JP2011174494A (en) * | 2010-02-23 | 2011-09-08 | Takeuchi Seisakusho:Kk | Hydraulic control device |
| CN106870480A (en) * | 2015-12-13 | 2017-06-20 | 田佳聪 | A kind of tractor hydraulic hitch pressurizing control system |
| CN107642514A (en) * | 2017-10-27 | 2018-01-30 | 南京农业大学 | A kind of application valve body for middle fraction horsepower Tractor Electronic Hydraulic Hitch System |
| CN210565406U (en) * | 2019-07-10 | 2020-05-19 | 申学智 | Hydraulic system of agricultural tricycle |
| CN111520367A (en) * | 2020-06-04 | 2020-08-11 | 潍坊力创电子科技有限公司 | Electric control hydraulic system of hydraulic suspension device, tractor and active damping control method |
-
2020
- 2020-06-04 CN CN202010500692.1A patent/CN111520367A/en active Pending
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2021
- 2021-01-07 WO PCT/CN2021/070621 patent/WO2021244031A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021244031A1 (en) * | 2020-06-04 | 2021-12-09 | 博鼎精工智能科技(山东)有限公司 | Electronically controlled hydraulic system of hydraulic suspension device, tractor and active damping control method |
| WO2022062277A1 (en) | 2020-09-22 | 2022-03-31 | 博鼎精工智能科技(山东)有限公司 | Intelligent control system of hydraulic hitch device |
| CN114793515A (en) * | 2022-02-18 | 2022-07-29 | 潍柴雷沃重工股份有限公司 | Vibration reduction method, device, system, equipment and medium of tractor and tractor |
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| Publication number | Publication date |
|---|---|
| WO2021244031A1 (en) | 2021-12-09 |
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