CN114619820B - Energy recovery system and method based on volume change of swing oil cylinder and carrier - Google Patents
Energy recovery system and method based on volume change of swing oil cylinder and carrier Download PDFInfo
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- CN114619820B CN114619820B CN202210191947.XA CN202210191947A CN114619820B CN 114619820 B CN114619820 B CN 114619820B CN 202210191947 A CN202210191947 A CN 202210191947A CN 114619820 B CN114619820 B CN 114619820B
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- 238000011084 recovery Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008859 change Effects 0.000 title claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 258
- 230000001502 supplementing effect Effects 0.000 claims description 46
- 239000013589 supplement Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 10
- 238000010248 power generation Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
- B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
- B60G13/08—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type hydraulic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/14—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers accumulating utilisable energy, e.g. compressing air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
- B60G2202/24—Fluid damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/40—Type of actuator
- B60G2202/41—Fluid actuator
- B60G2202/413—Hydraulic actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/40—Type of actuator
- B60G2202/41—Fluid actuator
- B60G2202/414—Fluid actuator using electrohydraulic valves
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- Mechanical Engineering (AREA)
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Abstract
The application discloses an energy recovery system and method based on the volume change of a swinging oil cylinder and a heavy carrier, wherein the energy recovery system comprises a left swinging oil cylinder and a right swinging oil cylinder which are arranged at two sides of a rear axle of a vehicle, each cavity of the left swinging oil cylinder and the right swinging oil cylinder is provided with a pressure sensor for detecting the pressure of the left swinging oil cylinder and the right swinging oil cylinder, a rodless cavity of the left swinging oil cylinder is respectively connected with a first electromagnetic valve and a rod-containing cavity of the right swinging oil cylinder, and the rod-containing cavity of the left swinging oil cylinder is respectively connected with a second electromagnetic valve and a rod-free cavity of the right swinging oil cylinder; the output end of the sensor controller is electrically connected with the pressure sensor, the first electromagnetic valve and the second electromagnetic valve respectively; the output ends of the first electromagnetic valve and the second electromagnetic valve are respectively connected with a recovery pump, and the power end of the recovery pump is connected with the storage battery through a recovery motor for energy recovery. The application adopts a double-channel volume-changing hydraulic recovery power generation system, and the two loops jointly generate peak-valley type power, thereby innovatively applying the characteristic of heavy material handling vehicle with large load to carry out system integration application.
Description
Technical Field
The application relates to the technical field of carrier vehicles, in particular to an energy recovery system and method based on volume change of a swing cylinder of a rear axle steering vehicle and a heavy carrier.
Background
At present, heavy material handling vehicles are mainly used for handling large materials in stations, ports, airports, factories, warehouses and the like, and the energy sources of the heavy material handling vehicles are divided into fuel oil, power supplies and the like. The operation of the carrier involves the operations of lifting, descending, tilting, side shifting, rotating, moving, steering and the like of the cargo device carried by the carrier, and the operations are realized by a set of hydraulic control system
At present, a heavy material carrier adopts a rear axle steering drive, and a rear axle is connected with a V-shaped vehicle body component through a hinge pin shaft; however, because the weight load of the whole truck is concentrated on the rear axle, the load of the whole truck balancing weight is more than 70% of the load of the rear axle when the whole truck is in no load, and the rear axle can float in the left and right directions, left and right swinging oil cylinders are arranged on two sides of the rear axle, so that the purpose is to overcome the defects that the truck swings left and right under different road conditions or the rear axle moves up and down rapidly on bumpy roads, and the running stability of the whole truck is improved.
However, the existing truck structure still has the following disadvantages:
1) The left swing cylinder and the right swing cylinder are directly limited by the limiting plate on the frame, and the rear axle has larger impact on the limiting plate when driving on a bumpy road surface;
2) The vibration of the rear axle of the whole vehicle is larger, and the service life of the rear axle is influenced due to no vibration absorption;
3) The left and right swing energy of the rear axle under the action of a large load cannot be recovered.
Therefore, there is a need to develop a hydraulic system and method for energy recovery for rear axle steering vehicles.
Disclosure of Invention
The application aims to provide an energy recovery system and method based on the volume change of a swing oil cylinder, which are suitable for a rear axle steering vehicle, so as to improve the stability of a heavy material carrier, reduce the influence of vibration on the rear axle and realize the recovery of hydraulic energy of the swing oil cylinder.
In order to achieve the above purpose, the present application provides the following technical solutions:
the energy recovery system based on the volume change of the swing oil cylinder comprises a left swing oil cylinder and a right swing oil cylinder which are arranged on two sides of a rear axle of the vehicle, wherein a rod cavity and a rodless cavity of the left swing oil cylinder and the right swing oil cylinder are respectively provided with a pressure sensor for detecting the pressure of the left swing oil cylinder and the right swing oil cylinder, and a power end of the pressure sensor is electrically connected with a sensor controller; the rodless cavity of the left swing oil cylinder is respectively connected with the rod-containing cavities of the first electromagnetic valve and the right swing oil cylinder, and the rod-containing cavity of the left swing oil cylinder is respectively connected with the rod-free cavities of the second electromagnetic valve and the right swing oil cylinder; the output end of the sensor controller is electrically connected with the first electromagnetic valve and the second electromagnetic valve respectively; the output ends of the first electromagnetic valve and the second electromagnetic valve are respectively connected with a recovery pump, and the power end of the recovery pump is connected with the storage battery through a recovery motor for energy recovery. The sensor controller collects the oil pressure value detected by each pressure sensor, compares the oil pressure value with the set recovered energy oil pressure, and controls the first electromagnetic valve and the second electromagnetic valve to open the oil path when the oil pressure is reached, so that the energy recovery oil path is conducted, and the recovery motor is driven to generate electricity through the recovery pump.
The hydraulic oil filling device further comprises a positive pressure oil filling tank which is connected in series between the rodless cavity and the rod cavity of the left swing oil cylinder and the right swing oil cylinder and between the rod cavity and the rodless cavity through one-way valves respectively and used for filling oil. The positive pressure oil supplementing tank has certain positive pressure and can actively promote hydraulic oil to enter the left and right swing oil cylinders.
In a further scheme, a rod cavity of the left swing oil cylinder is connected with the positive pressure oil supplementing box through a first adjustable overflow valve, and a rodless cavity of the right swing oil cylinder is connected with the positive pressure oil supplementing box through a second adjustable overflow valve.
Further, the oil inlet end of the one-way valve is connected with an oil supplementing filter device, and the oil supplementing filter device is arranged in the positive pressure oil supplementing tank.
Further, a first flow control valve is arranged between the first electromagnetic valve and the first recovery pump, and a second flow control valve is arranged between the second electromagnetic valve and the second recovery pump.
In a further scheme, a motor controller is arranged between the recovery motor and the storage battery, and the motor controller is respectively and electrically connected with the first flow control valve and the second flow control valve.
A second object of the present application is to provide a heavy truck having the above-described energy recovery system based on the change in volume of the swing cylinder.
The third object of the present application is to provide an energy recovery method based on a volume change of a swing cylinder, comprising the steps of:
step 1: connecting a rodless cavity of a left swing oil cylinder of a vehicle with a rod cavity of a right swing oil cylinder, and connecting the rod cavity of the left swing oil cylinder with the rodless cavity of the right swing oil cylinder to form two connecting oil paths; and the two connecting oil paths are respectively connected with a one-way valve in series and are connected with a positive pressure oil supplementing box for supplementing oil;
step 2: when the vehicle runs, the vehicle body drives the left swing oil cylinder and the right swing oil cylinder to float up and down together with the left swing oil cylinder and the right swing oil cylinder, and initial oil pressures V01 and V02 of two connecting oil paths between the left swing oil cylinder and the right swing oil cylinder are detected;
step 3: when V01 and V02 are unequal, the positive pressure oil supplementing tank with positive back pressure timely supplements oil to the low-pressure connecting oil paths through the one-way valve, so that the real-time oil pressures V1 of the two connecting oil paths are consistent, and the vehicle is stable;
step 4: when the real-time oil pressure V1 is smaller than the recovered energy oil pressure V2, the positive pressure oil supplementing tank simultaneously swings the oil cylinders leftwards and rightwards to supplement oil, and the volumes of the two connecting oil paths are kept consistent;
step 5: when the real-time oil pressure V1 reaches the recovered energy oil pressure V2, driving and opening an oil path of an electromagnetic valve connected with the recovery pump to enable the recovery pump to rotate reversely so as to enable the motor to generate electricity; meanwhile, the positive pressure oil supplementing tank timely continues to supplement oil in the left and right swinging oil cylinders.
Further, a pressure sensor for detecting the pressure of the rod cavity and the rodless cavity of the left swing oil cylinder and the right swing oil cylinder are respectively arranged on the rod cavity and the rodless cavity.
Further, the oil pressure V2 of the recovered energy is 21.5+/-0.8 Mpa; the positive back pressure of the positive pressure oil supplementing tank is 15-20bar.
The pressure sensor, the electromagnetic valve, the flow control valve, the adjustable overflow valve, the motor controller and the sensor controller are all products known in the art and are commercially available. The application selects the products with corresponding models according to actual needs, and directly applies the products to the technology of the application without relating to the improvement of the internal structure, the function, the principle and the like. The motor controller can be selected from SZ series motor controllers of Tianjin electric motor car technology Co., ltd, and the sensor controller can be selected from HSP series sensor controllers of Jiangsu MEMS intelligent sensor research institute.
Compared with the prior art, the product has the following advantages:
1. according to the application, the rod cavity of the left swing oil cylinder is connected with the rod-free cavity of the right swing oil cylinder, and the rod-free cavity of the left swing oil cylinder is connected with the rod cavity of the right swing oil cylinder, so that even though the oil pressures of the left swing oil cylinder and the right swing oil cylinder are complementary, the volumes of the two connecting oil paths are consistent, and therefore, the oil can be conveniently and uniformly replenished to the left swing oil cylinder and the right swing oil cylinder;
2. the application adopts the positive pressure oil supplementing tank with a certain positive pressure, and can prompt the oil in the oil cylinder to timely swing leftwards and rightwards, thereby compensating the negative pressure cavity generated by the rapid change of the stroke of the oil cylinder, further ensuring that the rear axle of the whole vehicle has better shock absorption and improving the carrying comfort of heavy materials;
3. because the oil pressure in each cavity of the left and right swinging oil cylinders is balanced, the stability of the oil cylinders is improved, and the service lives of key stress parts such as a rear axle and the like are prolonged; the available working conditions are utilized to the maximum extent to capture the energy back feeding system, so that the energy consumption of the whole vehicle is reduced;
4. the application adopts the positive pressure oil supplementing tank with a certain positive pressure to timely supplement oil in the left and right swing oil cylinders, and recovers energy, namely, tiny supplement of energy, and better aggregation effect, so that when the whole vehicle is initially designed, the whole motor and the electric control scheme can properly reduce the surplus, and the most economical whole overall target scheme is designed.
5. The application adopts a double-channel volume-changing hydraulic recovery power generation system, the two loops jointly generate peak-valley type power, and the energy recovery is remarkable; and the application innovatively applies the characteristic of heavy material handling vehicle with large load to carry out system integration application, recovers some energy to the maximum extent, and contributes to energy conservation of the whole machine.
Drawings
Fig. 1 is a schematic diagram of a hydraulic system of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1:
as shown in fig. 1: the energy recovery system based on the volume change of the swing oil cylinder comprises a left swing oil cylinder 5 and a right swing oil cylinder 10 which are arranged on two sides of a rear axle 1 of the vehicle, wherein a rod cavity and a rodless cavity of the left swing oil cylinder 5 and the right swing oil cylinder 10 are respectively provided with a pressure sensor for detecting the pressure of the left swing oil cylinder 5 and the right swing oil cylinder 10, and a power end of the pressure sensor is electrically connected with a sensor controller 25; the rodless cavity of the left swing oil cylinder 5 is respectively connected with the rod cavities of the first electromagnetic valve 13 and the right swing oil cylinder 10, and the rod cavities of the left swing oil cylinder 5 are respectively connected with the rod cavities of the second electromagnetic valve 14 and the right swing oil cylinder 10; the output end of the sensor controller 25 is electrically connected with the first electromagnetic valve 13 and the second electromagnetic valve 14 respectively; the output ends of the first electromagnetic valve 13 and the second electromagnetic valve 14 are respectively connected with a recovery pump, and the power end of the recovery pump is connected with the storage battery 22 through a recovery motor for energy recovery.
Further, the hydraulic oil filling device further comprises a positive pressure oil filling tank 2, wherein the positive pressure oil filling tank 2 is connected in series between a rodless cavity and a rod cavity of the left swing oil cylinder 5 and the right swing oil cylinder 10 and between the rod cavity and the rodless cavity through one-way valves respectively for filling oil.
Because the rod cavity of the left swing cylinder 5 is connected with the rod-free cavity of the right swing cylinder 10, the rod-free cavity of the left swing cylinder 5 is connected with the rod cavity of the right swing cylinder 10, so that the pressure of the two communicating cavities of the left swing cylinder and the right swing cylinder is ensured to be complementary; in addition, the positive pressure oil supplementing tank 2 has certain positive back pressure, so that hydraulic oil can be promoted to supplement oil to the left swing oil cylinder and the right swing oil cylinder respectively through the one-way valve. The oil pressure in the rod cavity and the rodless cavity of the left and right swing oil cylinders is detected in real time through the pressure sensor, and oil is timely replenished to the low-pressure connecting oil paths, so that the volumes of the two connecting oil paths connecting the left and right swing oil cylinders are consistent, and the vehicle is stable; and it is more convenient for the first check valve 11 and the second check valve 12 to uniformly replenish oil. When the oil pressure in the connecting oil way reaches a certain value, a valve core of the electromagnetic valve is opened, so that high-pressure hydraulic oil enters the recovery pump through the electromagnetic valve, and the recovery pump reversely rotates to drive the motor to generate electricity; energy recovery is achieved.
Further, the rod cavity of the left swing cylinder 5 is connected with the positive pressure oil supplementing tank 2 through the first adjustable overflow valve 3, and the rod-free cavity of the right swing cylinder 10 is connected with the positive pressure oil supplementing tank 2 through the second adjustable overflow valve 24.
The first adjustable overflow valve 3 and the second adjustable overflow valve 24 control the pressure levels of the two cavities of the left swing cylinder 5 and the right swing cylinder 10, and meanwhile, the pressure characteristics of the overflow valves in the first adjustable overflow valve 3 and the second adjustable overflow valve 24 can directly provide damping fluctuation of the pressures of the two cavities of the swing cylinder 5 and the right swing cylinder 10.
Further, the oil inlet end of the one-way valve is connected with an oil supplementing filter device 23, and the oil supplementing filter device 23 is arranged in the positive pressure oil supplementing tank 2.
Further, a first flow control valve 15 is provided between the first solenoid valve 13 and the first recovery pump 16, and a second flow control valve 19 is provided between the second solenoid valve 14 and the second recovery pump 21.
The first electromagnetic valve 13 and the second electromagnetic valve 14 are two-position two-way electromagnetic valves.
The flow control valve is a known product, and is a multifunctional valve for controlling flow by adopting a high-precision pilot mode, and is used for keeping the preset flow unchanged in a pipeline for controlling the flow and the pressure of liquid, limiting the excessive flow to a preset value, properly reducing the upstream high pressure, and not affecting the flow downstream of a main valve even if the pressure upstream of the main valve changes.
Still further, a motor controller 18 is disposed between the recovery motor and the storage battery 22, and the motor controller 18 is electrically connected to the first flow control valve 15 and the second flow control valve 19, respectively.
Specifically, as shown in fig. 1, the rear axle 1 is integrally connected with the V-shaped body member 4 through a hinge pin 26, and a left swing cylinder 5 and a right swing cylinder 10 are arranged between the rear axle 1 and the V-shaped body member 4. The pin shaft holes at the two ends of the left and right swing cylinders are respectively connected with the support holes above the rear axle and below the V-shaped frame through positioning pins, when the V-shaped frame is in a horizontal state, the included angle between the two cylinders and the horizontal is kept at 63 degrees, and when the left and right swing cylinders swing, the floating deviation of about 63 degrees plus or minus 5.5 degrees can be realized. The rodless cavity and the rod-containing cavity of the left swing cylinder 5 are respectively provided with a first pressure sensor 6 and a second pressure sensor 7, and the rod-containing cavity and the rodless cavity of the right swing cylinder 10 are respectively provided with a third pressure sensor 8 and a fourth pressure sensor 9.
The left swing oil cylinder 5 is provided with a rod cavity Y2, one path of the rod cavity Y is connected with a K1 port on the first adjustable overflow valve 3 through a tee joint S1, and a K2 port on the first adjustable overflow valve 3 is directly connected with the positive pressure oil supplementing tank 2; the other path is respectively connected with a tee joint S5 and a second one-way valve 12 through a tee joint S3, the tee joint S5 is respectively connected with a second electromagnetic valve 14 and a tee joint S4, and the tee joint S4 is respectively connected with a second adjustable overflow valve 24 and a rodless cavity Y4 on the right swing cylinder 10. The rodless cavity Y1 on the left swing cylinder 5 is respectively connected with the first electromagnetic valve 13 and the tee joint S2 through the tee joint S6, and the tee joint S2 is respectively connected with the first one-way valve 11 and the rod cavity Y3 of the right swing cylinder 10. The first check valve 11 and the second check valve 12 are directly connected with the oil supplementing filter device 23 through the tee joint Y3, and the oil supplementing filter device 23 is arranged in the positive pressure oil supplementing tank 2 to provide clean hydraulic oil for the oil cylinder.
The first electromagnetic valve 13 is connected with the first recovery pump 16 through the first flow control valve 15, the second electromagnetic valve 14 is connected with the second recovery pump 21 through the second flow control valve 19, oil return ports on the first recovery pump 16 and the second recovery pump 21 are directly connected with the positive pressure oil supplementing tank 2, G4 and G8 ports on the first flow control valve 15 and the second flow control valve 19 are directly connected with the positive pressure oil supplementing tank 2, and the motor controller 18, the battery 22 and the sensor controller 25 are respectively connected with a control system to realize conversion and transmission of electric signals and electric energy.
The working process is as follows:
when the heavy material handling vehicle runs under certain working conditions, the vehicle body can swing left and right or jolt under different road conditions, so that the rear axle can quickly move left and right up and down, meanwhile, the state of the V-shaped vehicle body component 4 is determined by the road surface state, and the left swing cylinder 5 and the right swing cylinder 10 arranged on the left side and the right side of the rear axle 1 and the V-shaped vehicle body component 4 can also float up and down. The rodless cavity of the left swing oil cylinder 5 is connected with the rodless cavity of the right swing oil cylinder 10, so that the pressure balance in the connected cavities of the two oil cylinders is ensured; when the oil pressure in the left swing oil cylinder 5 and the right swing oil cylinder 10 is smaller, the positive pressure oil supplementing tank 2 with a certain positive pressure can actively supplement oil in the left and right swing oil cylinders through the first one-way valve 11 and the second one-way valve 12, and the lower working pressure is preferably supplemented with oil for the cavity, so that the volume abrupt change negative pressure space generated by the rapid symmetrical movement of the left swing oil cylinder 5 and the right swing oil cylinder 10 is compensated, and the volumes of the two connecting oil paths are consistent. Meanwhile, as the dead weight of the whole heavy material handling vehicle is large, the floating speed is high and the oil supplementing speed is higher when the road condition and the steering are the same, and after the oil supplementing is carried out from the positive pressure oil supplementing tank 2 through the first one-way valve 11 and the second one-way valve 12 through the interaction of the left swing oil cylinder 5 and the right swing oil cylinder 10, higher pressure can be quickly built in the left swing oil cylinder 5 and the right swing oil cylinder 10.
The pressure parameters in the left swing cylinder 5 and the right swing cylinder 10 are detected in real time through the first pressure sensor 6, the second pressure sensor 7, the third pressure sensor 8 and the fourth pressure sensor 9, and signals acquired by the first pressure sensor 6, the second pressure sensor 7, the third pressure sensor 8 and the fourth pressure sensor 9 are transmitted to the sensor controller 25 for centralized analysis and processing. When the pressure reaches 21.5+/-0.8 Mpa, the first electromagnetic valve 13 and the second electromagnetic valve 14 are opened, high-pressure oil enters the first flow control valve 15 and the second flow control valve 19 through the first electromagnetic valve 13 and the second electromagnetic valve 14 respectively, and at the moment, the first flow control valve 15 and the second flow control valve 19 work at the lower position, G3-G4 and G7-G8 in the first flow control valve 15 and the second flow control valve 19 are throttle oil channels, and the G1-G2 and G5-G6 oil channels are adjustable optimal flow which meets the steady flow operation of the first recovery pump 16 and the second recovery pump 21 so as to meet the steady operation of the first recovery pump 16 and the second recovery pump 21, and drive the first recovery motor 17 and the second recovery motor 20 to generate electricity. The electric quantity generated by the first recovery motor 17 and the second recovery motor 20 is charged and stored to the storage battery 22 together through inversion and steady flow of the motor controller 18, and the power generation of the first recovery motor 17 and the power generation of the second recovery motor 20 are not interfered with each other, so that the electric quantity is accurately recovered.
The sensor controller 25 compares the pressure values detected by the four pressure sensors in real time through logic operation, and the first electromagnetic valve 13 and the second electromagnetic valve 14 only work when the oil pressure reaches 21.5+/-0.8 Mpa, so as to control the first recovery pump 16 and the second recovery pump 21 to drive the recovery motor to generate power. In practice, the energy recovery pump needs a certain pressure to drive the motor to generate electricity, and the setting of the sensor controller 25 is to furthest discriminate the specific working condition where the energy can be recovered.
Example 2:
a heavy truck having the swing cylinder volume change based energy recovery system described above. The specific recovery system is the same as in example 1.
Example 3:
an energy recovery method based on the volume change of a swinging oil cylinder comprises the following steps:
step 1: connecting a rodless cavity of a left swing oil cylinder 5 of a vehicle with a rod cavity of a right swing oil cylinder 10, and connecting the rod cavity of the left swing oil cylinder 5 with the rodless cavity of the right swing oil cylinder 10 to form two connecting oil paths; and a one-way valve is respectively connected in series with the two connecting oil paths and is connected with the positive pressure oil supplementing tank 2 for supplementing oil; the rod cavity and the rodless cavity of the left swing oil cylinder and the right swing oil cylinder are respectively provided with a pressure sensor for detecting the pressure of the rod cavity and the rodless cavity;
step 2: when the vehicle runs, the vehicle body drives the left swing oil cylinder and the right swing oil cylinder to float up and down together with the left swing oil cylinder and the right swing oil cylinder, and initial oil pressures V01 and V02 of two connecting oil paths between the left swing oil cylinder and the right swing oil cylinder are detected;
step 3: when V01 and V02 are unequal, the positive pressure oil supplementing tank 2 with positive back pressure of 15-20bar timely supplements oil to the low-pressure connecting oil way through the one-way valve, so that the real-time oil pressure V1 of the two connecting oil ways is consistent, and the vehicle is stable;
step 4: when the real-time oil pressure V1 is smaller than the recovered energy oil pressure V2, the positive pressure oil supplementing tank 2 swings the oil cylinders leftwards and rightwards to supplement oil at the same time, and the volumes of the two connecting oil paths are kept consistent; wherein the oil pressure V2 of the recovered energy is 21.5+/-0.8 Mpa;
step 5: when the real-time oil pressure V1 reaches the recovered energy oil pressure V2, driving and opening an oil path of an electromagnetic valve connected with the recovery pump to enable the recovery pump to rotate reversely so as to enable the motor to generate electricity; meanwhile, the positive pressure oil supplementing tank 2 continuously supplements oil in the left and right swinging oil cylinders in time.
Although the present disclosure describes embodiments, not every embodiment is described in terms of a single embodiment, and such description is for clarity only, and one skilled in the art will recognize that the embodiments described in the disclosure as a whole may be combined appropriately to form other embodiments that will be apparent to those skilled in the art.
Therefore, the above description is not intended to limit the scope of the application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. An energy recovery method based on the volume change of a swinging oil cylinder is characterized by comprising the following steps of: the method comprises the following steps:
step 1: the method comprises the steps that a rodless cavity of a left swing oil cylinder (5) of a vehicle is connected with a rod cavity of a right swing oil cylinder (10), and the rod cavity of the left swing oil cylinder (5) is connected with the rodless cavity of the right swing oil cylinder (10) to form two connecting oil paths; and the two connecting oil paths are respectively connected with a one-way valve in series and are connected with a positive pressure oil supplementing tank (2) for supplementing oil;
step 2: when the vehicle runs, the vehicle body drives the left swing oil cylinder (5) and the right swing oil cylinder (10) to float up and down along with the left swing oil cylinder, and initial oil pressures V01 and V02 of two connecting oil paths between the left swing oil cylinder (5) and the right swing oil cylinder (10) are detected;
step 3: when V01 and V02 are unequal, the positive pressure oil supplementing tank (2) with positive back pressure timely supplements oil to the low-pressure connecting oil way through the one-way valve, so that the real-time oil pressure V1 of the two connecting oil ways is consistent, and the vehicle is stable;
step 4: when the real-time oil pressure V1 is smaller than the recovered energy oil pressure V2, the positive pressure oil supplementing tank (2) supplements oil to the left swing oil cylinder (5) and the right swing oil cylinder (10) simultaneously, and the volumes of the two connecting oil paths are kept consistent;
step 5: when the real-time oil pressure V1 reaches the recovered energy oil pressure V2, driving and opening an oil path of an electromagnetic valve connected with the recovery pump to enable the recovery pump to rotate reversely so as to enable the motor to generate electricity; meanwhile, the positive pressure oil supplementing tank (2) is used for timely continuing to supplement oil in the left swing oil cylinder (5) and the right swing oil cylinder (10).
2. The energy recovery method according to claim 1, characterized in that: the pressure sensors for detecting the pressure of the left swing oil cylinder (5) and the right swing oil cylinder (10) are respectively arranged on the rod cavity and the rodless cavity.
3. The energy recovery method according to claim 1, characterized in that: the oil pressure V2 of the recovered energy is 21.5+/-0.8 Mpa; the positive back pressure of the positive pressure oil supplementing tank (2) is 15-20bar.
4. An energy recovery system implementing the energy recovery method of any one of claims 1-3, characterized by: the device comprises a left swing oil cylinder (5) and a right swing oil cylinder (10) which are arranged on two sides of a rear axle (1) of a vehicle, wherein a rod cavity and a rodless cavity of the left swing oil cylinder (5) and the right swing oil cylinder (10) are respectively provided with a pressure sensor for detecting the pressure of the rod cavity and the rodless cavity, and a power end of the pressure sensor is electrically connected with a sensor controller (25); the rodless cavity of the left swing oil cylinder (5) is respectively connected with the rod cavities of the first electromagnetic valve (13) and the right swing oil cylinder (10), and the rod cavities of the left swing oil cylinder (5) are respectively connected with the rodless cavities of the second electromagnetic valve (14) and the right swing oil cylinder (10); the output end of the sensor controller (25) is electrically connected with the first electromagnetic valve (13) and the second electromagnetic valve (14) respectively; the output ends of the first electromagnetic valve (13) and the second electromagnetic valve (14) are respectively connected with a recovery pump, and the power end of the recovery pump is connected with a storage battery (22) through a recovery motor for energy recovery;
the hydraulic oil filling device is characterized by further comprising a positive pressure oil filling tank (2), wherein the positive pressure oil filling tank (2) is connected in series between a rodless cavity and a rod cavity of the left swing oil cylinder (5) and the right swing oil cylinder (10) and between the rod cavity and the rodless cavity through one-way valves respectively for filling oil.
5. The energy recovery system of claim 4, wherein: the rod cavity of the left swing oil cylinder (5) is connected with the positive pressure oil supplementing tank (2) through a first adjustable overflow valve (3), and the rodless cavity of the right swing oil cylinder (10) is connected with the positive pressure oil supplementing tank (2) through a second adjustable overflow valve (24).
6. The energy recovery system of claim 4, wherein: the oil inlet end of the one-way valve is connected with an oil supplementing filter device (23), and the oil supplementing filter device (23) is arranged in the positive pressure oil supplementing tank (2).
7. The energy recovery system of claim 4, wherein: a first flow control valve (15) is arranged between the first electromagnetic valve (13) and the first recovery pump (16), and a second flow control valve (19) is arranged between the second electromagnetic valve (14) and the second recovery pump (21).
8. The energy recovery system of claim 7, wherein: a motor controller (18) is arranged between the recovery motor and the storage battery (22), and the motor controller (18) is electrically connected with the first flow control valve (15) and the second flow control valve (19) respectively.
9. A heavy carrier, characterized in that: having an energy recovery system according to claim 4.
10. A heavy carrier, characterized in that: having an energy recovery system according to any one of claims 5-8.
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| CN114619820A (en) | 2022-06-14 |
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