Electronically controlled hydraulic system of hydraulic suspension device, tractor and active shock absorption control method

Abstract

The present invention discloses an electronically controlled hydraulic system of a hydraulic suspension device, a tractor using the system, and a control method for actively damping a hooked agricultural implement using the system, wherein a first overflow pressure-maintaining branch oil circuit and a second overflow pressure-maintaining branch oil circuit are provided between a first working oil circuit and a second working oil circuit, the first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are provided with electronically controlled switch valves, the first overflow pressure-maintaining branch oil circuit includes a first overflow pressure-maintaining valve, the opening pressure of the first overflow pressure-maintaining valve is not less than the pressure of the hooked agricultural implement on the first working oil port when the electronically controlled hydraulic valve is in a neutral state; the second overflow pressure-maintaining branch oil circuit includes a second overflow pressure-maintaining valve. Compared with the prior art, the electronically controlled hydraulic system, tractor, and control method disclosed in the present invention reduce the responsiveness requirements for the electronic control unit and the electronically controlled hydraulic valve, and improve the active damping effect on the hooked agricultural implement.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic suspension devices for agricultural equipment, and in particular to an electronically controlled hydraulic system of a hydraulic suspension device capable of actively reducing the vibration of a mounted agricultural implement during a field transfer operation. The present invention also relates to a tractor using the electronically controlled hydraulic system and a control method for actively reducing the vibration of a mounted agricultural implement using the electronically controlled hydraulic system. Background Art

[0002] The hydraulic suspension device of agricultural equipment (such as tractors) is used to hang suspended or semi-suspended agricultural implements, lift and lower agricultural implements, adjust tillage depth, load drive wheels and output hydraulic power, etc. The hydraulic suspension device consists of a hydraulic system and a suspension mechanism. The hydraulic system includes an oil pump, a distributor, a lifting cylinder, and a cylinder operating mechanism, and the suspension mechanism includes an upper pull rod, a lower pull rod, and a lifting arm. By manipulating the distributor, the agricultural implement can be raised, lowered, neutralized, and floated, so that the tractor has position control, force control, and force-position integrated control functions.

[0003] The known electronically controlled hydraulic suspension device has upgraded the original manually controlled hydraulic system to an electronically controlled hydraulic system through force sensors (used to detect the tension information borne by the lower pull rod or the upper pull rod), position sensors (used to detect the position information of the lifting arm) and electronic control units, thereby realizing the automation and intelligence of agricultural tool operations.

[0004] When a tractor is connected to agricultural implements (such as tillage implements) for transfer operations, the tractor will vibrate as the road bumps. Due to the large size of the agricultural implements, the interaction between the agricultural implements and the tractor body itself will intensify the vibration of the tractor itself, causing negative impacts on the driver's physical and mental health and the service life of the tractor.

[0005] With the application of electronically controlled hydraulic systems in hydraulic suspension devices, it is possible to actively reduce the vibration of the attached agricultural implements (such as tillage implements) during the field transfer process. The basic principle of its shock absorption is to use the up and down movement of the lifting cylinder to compensate for the up and down vibration of the attached agricultural implements. When the tractor starts to vibrate due to the road surface, the electronic control unit collects information from the force sensor and the position sensor, determines the vibration amplitude and direction of the agricultural implement, and fills or drains the rod chamber and rodless chamber of the lifting cylinder through the electronically controlled hydraulic valve, so that the lifting cylinder produces a displacement opposite to the vibration direction, thereby reducing the vibration of the attached agricultural implement. This places high demands on the responsiveness of the electronic control unit and the electronically controlled hydraulic valve. In application, the lifting cylinder has a lag problem, which seriously affects the shock absorption effect. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the first technical problem to be solved by the present invention is to provide an electronically controlled hydraulic system for a hydraulic suspension device to reduce the responsiveness requirements for an electronically controlled unit and an electronically controlled hydraulic valve and improve the active shock absorbing effect on the mounted agricultural implements.

[0007] As the same inventive concept, the second technical problem to be solved by the present invention is to provide a tractor with an electronically controlled hydraulic system adopting the above-mentioned hydraulic suspension device.

[0008] As the same inventive concept, the third technical problem to be solved by the present invention is to provide a control method for actively reducing the shock of the mounted agricultural implement by using the electronically controlled hydraulic system of the above-mentioned hydraulic suspension device.

[0009] In order to solve the above-mentioned first technical problem, the technical solution adopted by the present invention is:

[0010] An electronically controlled hydraulic system of a hydraulic suspension device, comprising: an oil pump, a lifting oil cylinder and an electronically controlled hydraulic valve, wherein the oil pump, the cylinder body of the lifting oil cylinder and the electronically controlled hydraulic valve are arranged on a traction agricultural device, the piston rod of the lifting oil cylinder is hinged to the lifting arm, the electronically controlled 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 circuit, the second working oil port is communicated with a rod cavity of the lifting oil cylinder through a second working oil circuit, and the pressure oil port is communicated with a main oil circuit; a force sensor, the force sensor is used to detect the pulling force information borne by a lower pull rod or an upper pull rod; a position sensor, the position sensor is used to detect the position information of the lifting arm; The force sensor, the position sensor and the electronically controlled hydraulic valve are electrically connected to the electronic control unit respectively; a first overflow pressure-maintaining branch oil circuit for overflowing and maintaining pressure in the rodless chamber of the lifting cylinder and a second overflow pressure-maintaining branch oil circuit for overflowing and maintaining pressure in the rod chamber of the lifting cylinder are arranged between the first working oil circuit and the second working oil circuit, and the first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are provided with electronically controlled switch valves; the first overflow pressure-maintaining branch oil circuit includes 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 agricultural implement on the first working oil port when the electronically controlled hydraulic valve is in a neutral state; the second overflow pressure-maintaining branch oil circuit includes a second overflow pressure-maintaining valve.

[0011] Wherein, the electrically controlled switch valve is a normally closed electrically controlled switch valve.

[0012] Wherein, the first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are on-off controlled by only one of the electrically controlled switch valves.

[0013] Wherein, the first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are respectively provided with a throttle valve.

[0014] Wherein, the traction agricultural equipment includes a tractor.

[0015] To solve the above second technical problem, the technical solution adopted by the present invention is:

[0016] A tractor is provided with a hydraulic suspension device, and the hydraulic suspension device adopts the above-mentioned electronically controlled hydraulic system.

[0017] To solve the third technical problem, the technical solution adopted by the present invention is:

[0018] A control method for actively reducing vibration of a mounted agricultural implement adopts the electronically controlled hydraulic system of the hydraulic suspension device, comprising the following steps:

[0019] 1) The traction agricultural implement is connected to the agricultural implement by the hydraulic suspension device, and the field transfer operation mode is started, and the electric control unit is used to make the electric control switch valve in an open state;

[0020] 2) Automatic oil filling steps

[0021] The vibration caused by the bumps on the road is transmitted from the traction agricultural equipment to the lifting cylinder, so that the cylinder body of the lifting cylinder instantly moves upward relative to the piston rod of the lifting cylinder, and high-pressure oil is generated in the rodless chamber of the lifting cylinder. The high-pressure oil automatically flows to the rod chamber of the lifting cylinder through the first overflow pressure-maintaining branch oil circuit, so that the upward vibration amplitude of the hanging agricultural implement connected to the lifting arm is smaller than the upward vibration amplitude of the traction agricultural equipment connected to the cylinder body of the lifting cylinder; at the same time, the electronic control unit collects the tension information of the force sensor, and determines the amount of oil filled in the lifting cylinder according to the tension information; or

[0022] The vibration generated by the bumpy road is transmitted from the traction agricultural equipment to the lifting cylinder, so that the cylinder body of the lifting cylinder moves downward relative to the piston rod of the lifting cylinder instantly, and high-pressure oil is generated in the rod chamber of the lifting cylinder. The high-pressure oil automatically flows to the rodless chamber of the lifting cylinder through the second overflow pressure-maintaining branch oil passage, so that the downward vibration amplitude of the hooked agricultural implement connected to the lifting arm is smaller than the downward vibration amplitude of the traction agricultural equipment connected to the cylinder body of the lifting cylinder; at the same time, the electronic control unit collects the tension information of the force sensor, and determines the amount of oil filled in the lifting cylinder according to the tension information;

[0023] 3) Electronically controlled oil filling steps

[0024] When the automatic oil filling step is nearly finished, the electronic control unit further collects the position information of the position sensor and the tension information of the force sensor, and the electronic control unit corrects the previously determined oil filling amount of the lifting cylinder according to the further collected position information and tension information and starts the electronically controlled hydraulic valve; when the automatic oil filling step is finished, the high-pressure oil of the main oil circuit is immediately filled into the rodless chamber of the lifting cylinder through the electronically controlled hydraulic valve, and the return oil of the rod chamber of the lifting cylinder is depressurized until the relative position of the lifting cylinder piston rod and the lifting cylinder body returns to the initial position; or

[0025] When the automatic oil filling step is close to the end, the electronic control unit further collects the position information of the position sensor and the tension information of the force sensor, and the electronic control unit corrects the previously determined oil filling amount of the lifting cylinder according to the further collected position information and tension information and starts the electronically controlled hydraulic valve; when the automatic oil filling step is finished, the high-pressure oil of the main oil circuit is immediately filled into the rod chamber of the lifting cylinder through the electronically controlled hydraulic valve, and the rodless chamber of the lifting cylinder is depressurized by oil return, until the relative position of the lifting cylinder piston rod and the lifting cylinder body returns to the initial position;

[0026] 4) When the road is bumpy and continuous vibration occurs, repeat the above steps.

[0027] After adopting the above technical solution, the technical effects obtained by the present invention are:

[0028] When a towing farm implement (tractor) with farm implements suspended thereon begins to move to another field, the vibration generated by the bumpy road surface will cause the cylinder body and the piston rod of the lifting cylinder to instantly move relative to each other, thereby generating high-pressure oil in the rodless chamber or the rod chamber. Since a first overflow pressure-maintaining branch oil passage and a second overflow pressure-maintaining branch oil passage are provided between the first working oil passage and the second working oil passage, the high-pressure oil can automatically flow to the other chamber of the lifting cylinder through the first overflow pressure-maintaining branch oil passage or the second overflow pressure-maintaining branch oil passage, so that the vibration amplitude of the attached farm implement is smaller than the vibration amplitude of the towing farm implement, thereby achieving Active shock absorption; in the above-mentioned automatic oil filling step, the participation of the electronically controlled hydraulic valve is not required, so there is no response lag phenomenon; before the above-mentioned automatic oil filling step is completed, the electronically controlled hydraulic valve can be opened in advance, and at the end of the automatic oil filling step, the electronically controlled hydraulic valve can immediately start to replenish hydraulic oil from the main oil circuit to the cavity from which the high-pressure oil flows out. Since the above-mentioned electronically controlled oil filling step can be intervened in advance, the adverse effects caused by the response lag of the system are compensated, so the responsiveness requirements of the electronic control unit and the electronically controlled hydraulic valve are greatly reduced, thereby improving the active shock absorption effect of the attached agricultural implements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a schematic diagram of the structural principle of a tractor embodiment of the present invention provided with a hydraulic suspension device;

[0030] Figure 2 yes Figure 1 The hydraulic principle diagram of the part of the electronically controlled hydraulic system that realizes the automatic oil filling function;

[0031] In the figure: 100-tractor, 201-oil tank, 202-oil pump, 203-electrically controlled hydraulic valve, 204-electronic control unit, 205-lifting arm, 206-lifting cylinder, 207-lower pull rod, 208-force sensor, 209-upper pull rod, 210-position sensor, 211-tail button, 212-electrically controlled switch valve, 213-first overflow pressure maintaining valve, 214-throttle valve, 215-throttle valve, 216-second overflow pressure maintaining valve, 300-farm implement, A-first working oil port, B-second working oil port, P-pressure oil port. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] like Figure 1 As shown, a hydraulic suspension device is provided at the rear of the tractor 100, and the tractor 100 is connected to the agricultural implement 300 through the hydraulic suspension device. The hydraulic suspension device includes a suspension mechanism and an electronically controlled hydraulic system.

[0034] The suspension mechanism includes a lower pull rod 207, an upper pull rod 209 and a lifting arm 205. The lower pull rod 207 and the upper pull rod 209 are used to connect with the agricultural implement 300. The lifting arm 205 is used to connect with the lower pull rod 207. The lifting arm 205 is swung to realize the lifting of the agricultural implement 300.

[0035] The electronically controlled hydraulic system includes an oil tank 201, an oil pump 202, an electronically controlled hydraulic valve 203, an electronic control unit 204, a lifting cylinder 206, a force sensor 208, a position sensor 210, and a tail button 211. The cylinder body of the lifting cylinder 206 is installed on the tractor 100, and the piston rod of the lifting cylinder 206 is hinged to the lifting arm 205. The force sensor 208 is arranged on the lower pull rod 207 to detect the pulling force information borne by the lower pull rod 207. Of course, it can also be arranged on the upper pull rod. The position sensor 210 is used to detect the position information of the lifting arm 205. The electronically controlled hydraulic valve 203 is used to provide hydraulic oil or return oil pressure relief to the lifting cylinder 206. In the neutral state, the rod chamber and the rodless chamber of the lifting cylinder 206 are both closed by the electronically controlled hydraulic valve 203. The electronically controlled hydraulic valve 203 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 connected to the rodless chamber of the lifting cylinder 206 through the first working oil circuit, the second working oil port B is connected to the rod chamber of the lifting cylinder 206 through the second working oil circuit, and the pressure oil port P is connected to the main oil circuit. The tail button 211 is used to start the electronically controlled hydraulic system. The electronically controlled hydraulic valve 203, the force sensor 208, the position sensor 210 and the tail button 211 are all electrically connected to the electronic control unit 204. The electronic control unit 204 receives the relevant information of the force sensor 208 and the position sensor 210, and issues instructions to the electronically controlled hydraulic valve 203 after processing. These structures and principles are well known to ordinary people in the field and will not be described in detail here.

[0036] The contribution of the present invention to the prior art is mainly reflected in that the above-mentioned electronically controlled hydraulic system reduces the responsiveness requirements of the electronically controlled unit and the electronically controlled hydraulic valve, and improves the active shock absorption effect of the attached agricultural implement. Figure 2 As shown, a first overflow pressure-maintaining branch oil circuit for overflowing and maintaining pressure in the rodless chamber of the lifting cylinder 206 and a second overflow pressure-maintaining branch oil circuit for overflowing and maintaining pressure in the rod chamber of the lifting cylinder 206 are arranged between the first working oil circuit and the second working oil circuit, and the first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit 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 circuit and the second overflow pressure-maintaining branch oil circuit are on and off controlled by only one electrically-controlled switch valve 212.

[0037] The first overflow pressure-maintaining branch oil circuit is provided with a first overflow pressure-maintaining valve 213 and a throttle valve 214. The opening pressure of the first overflow pressure-maintaining valve 213 is not less than the pressure of the agricultural implement 300 on the first working oil port A when the electronically controlled hydraulic valve 203 is in a neutral state. The second overflow pressure-maintaining branch oil circuit is provided with a second overflow pressure-maintaining valve 216 and a throttle valve 215. By adjusting the size of the throttle valve, the oil filling rate can be adjusted to control the shock absorption amplitude not to exceed the rated size to avoid accidents.

[0038] The control method for actively reducing the vibration of the mounted agricultural implement using the electronically controlled hydraulic system of the hydraulic suspension device comprises the following steps:

[0039] 1) When the tractor 100 uses the hydraulic suspension device to hook up the farm implement 300 and starts the field transfer operation mode, the electric control unit 204 makes the electric control switch valve 212 in an energized and open state. Of course, when the tractor is in the farming mode, the electric control switch valve 212 needs to be powered off and closed.

[0040] 2) Automatic oil filling steps

[0041] The vibration caused by the bumpy road surface is transmitted from the tractor 100 to the lifting cylinder 206, causing the cylinder body of the lifting cylinder 206 to move relative to the piston rod. This relative movement can be divided into two situations, one is instantaneous upward movement, and the other is instantaneous downward movement.

[0042] First, when the cylinder body of the lifting cylinder 206 moves upward instantaneously relative to the piston rod, high-pressure oil is generated in the rodless chamber of the lifting cylinder 206, and the high-pressure oil automatically flows to the rod chamber of the lifting cylinder 206 through the first overflow pressure-maintaining branch oil circuit, so that the upward vibration amplitude of the mounted agricultural implement 300 connected to the lifting arm 205 is smaller than the upward vibration amplitude of the tractor 100 connected to the cylinder body of the lifting cylinder 206; at the same time, the electronic control unit 204 collects the tension information of the force sensor 208, and determines the amount of oil to be filled in the lifting cylinder 206 according to the tension information, and no oil is filled at this time.

[0043] Furthermore, when the cylinder body of the lifting cylinder 206 moves downward instantaneously relative to the piston rod, high-pressure oil is generated in the rod chamber of the lifting cylinder 206, and the high-pressure oil automatically flows to the rodless chamber of the lifting cylinder 206 through the second overflow pressure-maintaining branch oil circuit, so that the downward vibration amplitude of the mounted agricultural implement 300 connected to the lifting arm 205 is smaller than the downward vibration amplitude of the tractor connected to the cylinder body of the lifting cylinder 206; at the same time, the electronic control unit 204 collects the tension information of the force sensor 208, and determines the amount of oil to be filled into the lifting cylinder 206 according to the tension information, and no oil is filled at this time.

[0044] 3) Electronically controlled oil filling steps

[0045] In view of the situation where the cylinder body of the above-mentioned lifting cylinder 206 moves upward instantaneously relative to the piston rod, when the automatic oil filling step is about to end, the electronic control unit 204 further collects 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 cylinder according to the further collected position information and tension information and starts the electronically controlled hydraulic valve 203; when the automatic oil filling step ends, the high-pressure oil of the main oil circuit is immediately filled into the rodless chamber of the lifting cylinder 206 through the electronically controlled hydraulic valve 203, and at the same time, the return oil of the rod chamber of the lifting cylinder 206 is depressurized until the relative position of the piston rod and the cylinder body of the lifting cylinder 206 returns to the initial position, that is, the position sensor 210 returns to the value before the vibration.

[0046] In response to the situation where the cylinder body of the above-mentioned lifting cylinder 206 moves downward instantaneously relative to the piston rod, when the automatic oil filling step is nearing the end, the electronic control unit 204 further collects 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 cylinder according to the further collected position information and tension information and starts the electronically controlled hydraulic valve 203; when the automatic oil filling step is completed, the high-pressure oil of the main oil circuit is immediately filled into the rod chamber of the lifting cylinder through the electronically controlled hydraulic valve 203, and at the same time, the rodless chamber of the lifting cylinder is returned to the oil to relieve the pressure until the relative position of the piston rod and the cylinder body of the lifting cylinder 206 returns to the initial position.

[0047] 4) When the road is bumpy and continuous vibration occurs, repeat the above steps.

[0048] In the present invention, the traction agricultural equipment is not limited to a tractor, but may also be other agricultural equipment such as a rice transplanter.

[0049] The present invention is not limited to the above embodiments, and all improvements based on the concept, principle, structure and method of the present invention will fall within the protection scope of the present invention.

Claims

1. An electronically controlled hydraulic system for a hydraulic suspension device, comprising: An oil pump, a lifting oil cylinder and an electronically controlled hydraulic valve, wherein the oil pump, the cylinder body of the lifting oil cylinder and the electronically controlled hydraulic valve are arranged on a traction agricultural device, the piston rod of the lifting oil cylinder is hinged to the lifting arm, the electronically controlled 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 chamber of the lifting oil cylinder through a first working oil circuit, the second working oil port (B) is communicated with a rod chamber of the lifting oil cylinder through a second working oil circuit, and the pressure oil port (P) is communicated with a main oil circuit; A force sensor, wherein the force sensor is used to detect the tension information borne by the lower pull rod or the upper pull rod; A position sensor, the position sensor is used to detect the position information of the lifting arm; The force sensor, the position sensor and the electronically controlled hydraulic valve are electrically connected to the electronic control unit respectively; it is characterized in that: A first overflow pressure-maintaining branch oil circuit for overflowing and maintaining pressure on the rodless chamber of the lifting cylinder and a second overflow pressure-maintaining branch oil circuit for overflowing and maintaining pressure on the rod chamber of the lifting cylinder are provided between the first working oil circuit and the second working oil circuit, and the first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are provided with electronically controlled switch valves; The first overflow pressure-maintaining branch oil circuit includes 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 agricultural implement on the first working oil port (A) when the electronically controlled hydraulic valve is in a neutral state; The second overflow pressure-maintaining branch oil circuit includes a second overflow pressure-maintaining valve.

2. The electronically controlled hydraulic system of the hydraulic suspension device according to claim 1, characterized in that: The electrically controlled switch valve is a normally closed electrically controlled switch valve.

3. The electronically controlled hydraulic system of the hydraulic suspension device according to claim 1, characterized in that: The first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are on-off controlled by only one of the electronically controlled switch valves.

4. The electronically controlled hydraulic system of the hydraulic suspension device according to claim 1, characterized in that: The first overflow pressure-maintaining branch oil passage and the second overflow pressure-maintaining branch oil passage are respectively provided with a throttle valve.

5. The electronically controlled hydraulic system of the hydraulic suspension device according to any one of claims 1 to 4, characterized in that: The traction agricultural equipment includes a tractor.

6. A tractor, characterized in that: The tractor is provided with a hydraulic suspension device, and the hydraulic suspension device adopts the electronically controlled hydraulic system according to claim 1, and the traction agricultural equipment is the tractor.

7. A control method for active shock absorption of a mounted agricultural implement, characterized in that: The electronically controlled hydraulic system of the hydraulic suspension device according to claim 1 comprises the following steps: 1) The traction agricultural implement is connected to the agricultural implement by the hydraulic suspension device, and the field transfer operation mode is started, and the electric control unit is used to make the electric control switch valve in an open state; 2) Automatic oil filling steps The vibration generated by the bumpy road is transmitted from the traction agricultural equipment to the lifting cylinder, so that the cylinder body of the lifting cylinder moves upward relative to the piston rod of the lifting cylinder instantly, and high-pressure oil is generated in the rodless chamber of the lifting cylinder. The high-pressure oil automatically flows to the rod chamber of the lifting cylinder through the first overflow pressure-maintaining branch oil passage, so that the upward vibration amplitude of the hanging agricultural implement connected to the lifting arm is smaller than the upward vibration amplitude of the traction agricultural equipment connected to the cylinder body of the lifting cylinder; at the same time, the electronic control unit collects the tension information of the force sensor, and determines the amount of oil filled in the lifting cylinder according to the tension information; or The vibration generated by the bumpy road is transmitted from the traction agricultural equipment to the lifting cylinder, so that the cylinder body of the lifting cylinder moves downward relative to the piston rod of the lifting cylinder instantly, and high-pressure oil is generated in the rod chamber of the lifting cylinder. The high-pressure oil automatically flows to the rodless chamber of the lifting cylinder through the second overflow pressure-maintaining branch oil passage, so that the downward vibration amplitude of the hooked agricultural implement connected to the lifting arm is smaller than the downward vibration amplitude of the traction agricultural equipment connected to the cylinder body of the lifting cylinder; at the same time, the electronic control unit collects the tension information of the force sensor, and determines the amount of oil filled in the lifting cylinder according to the tension information; 3) Electronically controlled oil filling steps When the automatic oil filling step is close to the end, the electronic control unit further collects the position information of the position sensor and the tension information of the force sensor, and the electronic control unit corrects the previously determined oil filling amount of the lifting cylinder according to the further collected position information and tension information and starts the electronically controlled hydraulic valve; when the automatic oil filling step is finished, the high-pressure oil of the main oil circuit is immediately filled into the rodless chamber of the lifting cylinder through the electronically controlled hydraulic valve, and the return oil of the rod chamber of the lifting cylinder is depressurized at the same time, until the relative position of the lifting cylinder piston rod and the lifting cylinder body returns to the initial position; or When the automatic oil filling step is close to the end, the electronic control unit further collects the position information of the position sensor and the tension information of the force sensor, and the electronic control unit corrects the previously determined oil filling amount of the lifting cylinder according to the further collected position information and tension information and starts the electronically controlled hydraulic valve; when the automatic oil filling step is finished, the high-pressure oil of the main oil circuit is immediately filled into the rod chamber of the lifting cylinder through the electronically controlled hydraulic valve, and the rodless chamber of the lifting cylinder is depressurized by oil return, until the relative position of the lifting cylinder piston rod and the lifting cylinder body returns to the initial position; 4) When the road is bumpy and continuous vibration occurs, repeat the above steps.

8. The control method for active shock absorption of a mounted agricultural implement as claimed in claim 7, characterized in that: The electrically controlled switch valve is a normally closed electrically controlled switch valve.

9. The control method for active shock absorption of a mounted agricultural implement as claimed in claim 7, characterized in that: The first overflow pressure-maintaining branch oil circuit and the second overflow pressure-maintaining branch oil circuit are on-off controlled by only one of the electronically controlled switch valves.

10. The control method for active shock absorption of a mounted agricultural implement as claimed in claim 7, characterized in that: The first overflow pressure-maintaining branch oil passage and the second overflow pressure-maintaining branch oil passage are respectively provided with a throttle valve.

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