阅读说明：本技术 一种基于数字控制式液压缸组的液电式馈能减振器系统 (Hydro-electric type energy-feedback shock absorber system based on digital control type hydraulic cylinder group ) 是由 曾亿山 高干 刘常海 虢锐 吕安庆 于 2021-07-09 设计创作，主要内容包括：本发明公开了一种基于数字控制式液压缸组的液电式馈能减振器系统,包括集成型数字控制式液压缸组、整流桥回路、液压马达、发电机和蓄电池,集成型数字控制式液压缸组包括至少一个液压缸单元,每个液压缸单元包括高速开关阀一、高速开关阀二和至少两个子液压缸,每个液压缸单元内所有子液压缸的有杆腔/无杆腔通过油路相连后接入高速开关阀一/高速开关阀二的P口,所有液压缸单元的高速开关阀一/高速开关阀二的A口通过油路相连后形成系统高压端/系统低压端。该系统通过不同的活塞面积组合配置调节减振器系统输出的阻尼力,与不平路面激励力的变化进行自适应变化,使系统具备较好的阻尼特性,能够有效缓解汽车运行过程中的冲击振动。(The invention discloses a hydro-electric energy feedback shock absorber system based on a digital control type hydraulic cylinder group, which comprises an integrated digital control type hydraulic cylinder group, a rectifier bridge loop, a hydraulic motor, a generator and a storage battery, wherein the integrated digital control type hydraulic cylinder group comprises at least one hydraulic cylinder unit, each hydraulic cylinder unit comprises a first high-speed switch valve, a second high-speed switch valve and at least two sub hydraulic cylinders, rod cavities/rodless cavities of all the sub hydraulic cylinders in each hydraulic cylinder unit are connected through an oil way and then are connected into a P port of the first high-speed switch valve/the second high-speed switch valve, and A ports of the first high-speed switch valve/the second high-speed switch valve of all the hydraulic cylinder units are connected through the oil way and then form a system high-pressure end/a system low-pressure end. The system adjusts the damping force output by the shock absorber system through different piston area combination configurations, and performs self-adaptive change with the change of the excitation force of the uneven road surface, so that the system has better damping characteristic, and can effectively relieve the impact vibration in the running process of the automobile.)

1. The utility model provides an ability shock absorber system is presented to hydroelectric formula based on digital control formula hydraulic cylinder group which characterized in that: the integrated digital control type hydraulic cylinder group comprises at least one hydraulic cylinder unit, each hydraulic cylinder unit comprises a first high-speed switch valve, a second high-speed switch valve and at least two sub hydraulic cylinders, rod cavities/rodless cavities of all the sub hydraulic cylinders in each hydraulic cylinder unit are connected through an oil way and then are connected into a P port of the first high-speed switch valve/the second high-speed switch valve, ports A of the first high-speed switch valves/the second high-speed switch valves of all the hydraulic cylinder units are connected through an oil way and then form a high-pressure end/a low-pressure end of a system, and ports B of the first high-speed switch valves and the second high-speed switch valves of all the hydraulic cylinder units are connected through oil ways and then are connected into an oil tank of the system;

the rectifier bridge loop comprises a first check valve, a second check valve, a third check valve and a fourth check valve, an oil outlet of the first check valve and an oil inlet of the second check valve are connected through an oil path and then connected to a high-pressure end of the system, an oil outlet of the third check valve and an oil inlet of the fourth check valve are connected through an oil path and then connected to a low-pressure end of the system, an oil outlet of the second check valve and an oil outlet of the fourth check valve are connected through an oil path and then connected to an oil inlet of the hydraulic motor, and an oil inlet of the first check valve and an oil inlet of the third check valve are connected through an oil path and then connected to an oil outlet of the hydraulic motor;

the oil inlet of the hydraulic motor is connected with a high-pressure energy accumulator, the oil outlet of the hydraulic motor is connected with a low-pressure energy accumulator, the output shaft end of the hydraulic motor is in transmission connection with a rotating shaft of the generator, and the output end of the generator is electrically connected with the input end of the storage battery.

2. The hydro-electric energy-regenerative shock absorber system based on the digital control type hydraulic cylinder group as claimed in claim 1, wherein: the piston areas of the sub hydraulic cylinders in each hydraulic cylinder unit are the same, and the piston areas of the sub hydraulic cylinders in different hydraulic cylinder units are different.

3. The hydro-electric type energy-regenerative shock absorber system based on the digital control type hydraulic cylinder group as claimed in claim 1 or 2, wherein: the number of the sub hydraulic cylinders in each hydraulic cylinder unit is two, and the sub hydraulic cylinders are symmetrically distributed in the horizontal plane.

4. The hydro-electric energy-regenerative shock absorber system based on the digital control type hydraulic cylinder group as claimed in claim 1, wherein: and control signals of the high-speed switch valves I and the high-speed switch valves II in all the hydraulic cylinder units are synchronous.

5. The hydro-electric energy-regenerative shock absorber system based on the digital control type hydraulic cylinder group as claimed in claim 1, wherein: the working positions of the high-speed switch valve I and the high-speed switch valve II in each hydraulic cylinder unit are the same, and the working positions of the high-speed switch valve I/the high-speed switch valve II in different hydraulic cylinder units are the same or different.

6. The hydro-electric type energy-regenerative shock absorber system based on the digital control type hydraulic cylinder group as claimed in claim 1, 2, 4 or 5, wherein: the high-speed switch valve I and the high-speed switch valve II are two-position three-way electromagnetic directional valves with the same type.

7. The utility model provides a novel present can suspension, includes the suspension main part, its characterized in that: the suspension main body is provided with the hydro-electric type energy-regenerative shock absorber system based on the digital control type hydraulic cylinder group as claimed in claim 1.

Technical Field

The invention relates to the technical field of hydraulic vibration reduction, which is mainly used for relieving vehicle vibration and recovering system energy, in particular to a hydro-electric type energy feedback vibration absorber system based on a digital control type hydraulic cylinder group.

Background

The energy problem of the current society becomes one of the hot spots which are generally concerned by people, and people advocate energy conservation and emission reduction, energy recycling and the like vigorously under the large background of 'carbon neutralization' called for all over the world. With the wide use of automobiles in modern life, the research on vibration reduction and energy recovery of vehicle suspension devices is particularly important.

Compared with the traditional suspension system, the energy feedback type suspension system can take the advantages of vibration reduction and energy recovery into consideration. According to different energy conversion modes, the energy feedback type suspension can be mainly divided into five types, namely a mechanical type, a piezoelectric type, an electromagnetic type, a hydraulic type and a hydraulic type. The mechanical energy-feedback suspension mainly converts the linear motion of a suspension device into the rotary motion of a generator, so that the mechanical energy generated by the motion of the suspension device can be converted into the electric energy of the generator, and the effect of energy recovery and reutilization is achieved. The mechanical energy-feedback suspension has a complex structure, generally has high requirements on manufacturing precision and cost, has poor impact reduction and vibration reduction effects, and has low energy recovery efficiency; the piezoelectric energy feedback suspension is based on the piezoelectric effect of a piezoelectric material, mainly comprises a piezoelectric element, a transmission mechanism, a related elastic element and the like, and has the advantages of simpler structure, convenient system modularization and integration, small mechanical damping and inertia, high generated voltage and the like, but also has a plurality of defects, such as lower generated vibration frequency than the resonance frequency of the piezoelectric element, lower energy feedback efficiency and the like; the electromagnetic energy-feedback suspension mainly utilizes an electromagnetic device to replace a traditional damper on a common suspension system, has higher requirement on the precision of a transmission mechanism element and high manufacturing cost, and is generally not easy to be applied to vehicle suspensions; compared with other types of energy feedback vibration damping devices, the hydraulic energy feedback suspension has the advantages that the capacity of an energy accumulator limits the amount of absorbed energy, loss is caused in the process of oil liquid flowing again, and therefore energy recovery efficiency is reduced.

The damping force adjustable of the system is formed by changing the electromagnetic torque of the generator by changing the adjustable load resistance or the current of the energy feedback circuit, so as to control the back electromotive force moment of the generator to control the magnitude of the adjustable damping force, the control strategy required by the damping force control method which takes the control of the load of the generator as a main idea is complex, and is limited by the adjustability of the inlet and outlet pressure of the hydraulic motor, namely limited by the range of pressure regulation of the energy accumulator with constant initial pressure, so that the damping characteristic of the system is slightly different from the damping characteristic of the traditional suspension and is difficult to match, and the heat effect of the resistance can convert a part of electric energy into heat energy, resulting in energy loss, which is inconsistent with the purpose of energy feedback.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a hydro-electric energy feedback shock absorber system based on a digital control type hydraulic cylinder group, the digital control type hydraulic cylinder group consisting of a plurality of sub hydraulic cylinders is adopted, the damping force output by the shock absorber system is adjusted by changing the area of a piston connected into a system loop of the digital control type hydraulic cylinder group, and the damping force of the system can be adaptively changed along with the change of the excitation force of an uneven road surface within a certain range, so that the system has better damping characteristic and is adaptively adjusted and matched with a spring system of a suspension device, thereby not only effectively damping, improving the smoothness of a vehicle, but also realizing the recycling of energy.

In order to realize the effect, the invention adopts the technical scheme that:

the utility model provides an ability shock absorber system is presented to hydroelectric formula based on digital control formula hydraulic cylinder group which characterized in that: the integrated digital control type hydraulic cylinder group comprises at least one hydraulic cylinder unit, each hydraulic cylinder unit comprises a first high-speed switch valve, a second high-speed switch valve and at least two sub hydraulic cylinders, rod cavities/rodless cavities of all the sub hydraulic cylinders in each hydraulic cylinder unit are connected through an oil way and then are connected into a P port of the first high-speed switch valve/the second high-speed switch valve, ports A of the first high-speed switch valves/the second high-speed switch valves of all the hydraulic cylinder units are connected through an oil way and then form a high-pressure end/a low-pressure end of a system, and ports B of the first high-speed switch valves and the second high-speed switch valves of all the hydraulic cylinder units are connected through oil ways and then are connected into an oil tank of the system;

the rectifier bridge loop comprises a first check valve, a second check valve, a third check valve and a fourth check valve, an oil outlet of the first check valve and an oil inlet of the second check valve are connected through an oil path and then connected to a high-pressure end of the system, an oil outlet of the third check valve and an oil inlet of the fourth check valve are connected through an oil path and then connected to a low-pressure end of the system, an oil outlet of the second check valve and an oil outlet of the fourth check valve are connected through an oil path and then connected to an oil inlet of the hydraulic motor, and an oil inlet of the first check valve and an oil inlet of the third check valve are connected through an oil path and then connected to an oil outlet of the hydraulic motor;

the oil inlet of the hydraulic motor is connected with a high-pressure energy accumulator, the oil outlet of the hydraulic motor is connected with a low-pressure energy accumulator, the output shaft end of the hydraulic motor is in transmission connection with a rotating shaft of the generator, and the output end of the generator is electrically connected with the input end of the storage battery.

Furthermore, the piston areas of the sub hydraulic cylinders in each hydraulic cylinder unit are the same, and the piston areas of the sub hydraulic cylinders in different hydraulic cylinder units are different.

Furthermore, the number of the sub hydraulic cylinders in each hydraulic cylinder unit is two, and the sub hydraulic cylinders are symmetrically distributed in the horizontal plane.

Furthermore, control signals of the high-speed switch valves I and the high-speed switch valves II in all the hydraulic cylinder units are synchronous.

Furthermore, the working positions of the first high-speed switch valve and the second high-speed switch valve in each hydraulic cylinder unit are the same, and the working positions of the first high-speed switch valve and the second high-speed switch valve in different hydraulic cylinder units are the same or different.

Furthermore, the high-speed switch valve I and the high-speed switch valve II are two-position three-way electromagnetic directional valves with the same type.

The invention further provides a novel energy feedback suspension, which comprises a suspension main body, wherein the hydro-electric energy feedback shock absorber system based on the digital control type hydraulic cylinder group is arranged on the suspension main body.

Compared with the prior art, the invention has the following beneficial effects:

1. the integrated digital control type hydraulic cylinder group consisting of a plurality of sub hydraulic cylinders is adopted, the piston area of a system loop accessed by the digital control type hydraulic cylinder group can be changed through different piston area combination configurations, and then the damping force output by the shock absorber system is adjusted, so that the system has better damping characteristics, is adaptively adjusted and matched with a spring system of a suspension device, can effectively damp vibration, and improves the smoothness of a vehicle;

2. the damping force adjustment of the shock absorber system is changed according to the piston area of the integrated digital control type hydraulic cylinder group access system loop, and compared with the technology that the back electromotive force moment of a generator is changed by accessing an energy feedback circuit and changing the adjustable load resistance or the current of the energy feedback circuit to adjust the damping force in the existing hydraulic electric energy feedback shock absorber, the system is simpler and easy to control, and can reduce unnecessary energy loss;

3. the integrated digital control type hydraulic cylinder group adopted by the invention has the advantages that the number of the sub hydraulic cylinders and the piston area size can be selected in various ways and combined in different ways, N pairs of hydraulic cylinder groups are connected, the system has 2N motion states, the more the number of the connected hydraulic cylinder groups is, the more the different combinations of the piston areas of the connected hydraulic cylinder groups are, the more the motion states of the system are, the more accurate the damping force adjustment of the system is, and the better the smoothness of the automobile on an uneven road surface is.

Drawings

FIG. 1 is a schematic diagram of an integrated digitally controlled hydraulic cylinder bank of the present invention;

FIG. 2 is a schematic diagram of the electrohydraulic energy regenerative shock absorber system of the present invention;

FIG. 3 is a graph of indicator characteristics corresponding to different digital control hydraulic cylinder group codes;

FIG. 4 is a speed characteristic curve corresponding to different digital control type hydraulic cylinder group codes;

fig. 5 is a simulation comparison result of damping characteristics of a conventional suspension and a novel energy feedback suspension to which the electrohydraulic energy feedback damper system of the present invention is applied.

Wherein: 1.1 first group of sub hydraulic cylinders, 1.2 first group of sub hydraulic cylinders, 1.3 second group of sub hydraulic cylinders, 1.4 second group of sub hydraulic cylinders, 1.5 third group of sub hydraulic cylinders, 1.6 third group of sub hydraulic cylinders, 2.1 first group of high-speed switch valves, 2.2 first group of high-speed switch valves, 2.3 second group of high-speed switch valves, 2.4 second group of high-speed switch valves, 2.5 third group of high-speed switch valves, 2.6 third group of high-speed switch valves, 3 oil tanks, 4.1 one-way valves, 4.2 one-way valves, 4.3 one-way valves, 4.4 one-way valves, 5 high-pressure accumulators, 6 low-pressure accumulators, 7 hydraulic motors, 8 generators and 9 accumulators.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Referring to fig. 1 and 2, a hydro-electric type energy feedback shock absorber system based on a digital control type hydraulic cylinder group includes an integrated digital control type hydraulic cylinder group, a rectifier bridge circuit, a hydraulic motor, a generator and a storage battery.

The integrated digital control type hydraulic cylinder group comprises at least one hydraulic cylinder unit, and each hydraulic cylinder unit comprises a first high-speed switch valve, a second high-speed switch valve and at least two sub-hydraulic cylinders. In this embodiment, the number of the hydraulic cylinder units is three, and the number of the sub-hydraulic cylinders in each hydraulic cylinder unit is two, as shown in fig. 1. Specifically, the first group of the first hydraulic cylinder 1.1 and the first group of the second hydraulic cylinder 1.2 in the first hydraulic cylinder unit are hydraulic cylinders with two pistons having the same area, the second group of the first hydraulic cylinder 1.3 and the second group of the second hydraulic cylinder 1.4 in the second hydraulic unit are hydraulic cylinders with two pistons having the same area, and the third group of the first hydraulic cylinder 1.5 and the third group of the second hydraulic cylinder 1.6 in the third hydraulic unit are hydraulic cylinders with two pistons having the same area. The first group of high-speed switch valve I2.1 and the first group of high-speed switch valve II 2.2 in the first hydraulic cylinder unit, the second group of high-speed switch valve I2.3 and the second group of high-speed switch valve II 2.4 in the second hydraulic cylinder unit, the third group of high-speed switch valve I2.5 and the third group of high-speed switch valve II 2.6 in the third hydraulic cylinder unit are two-position three-way electromagnetic directional valves with the same type.

The rod cavities/rodless cavities of all the sub hydraulic cylinders in each hydraulic cylinder unit are connected through oil passages and then are connected with the P ports of the first high-speed switch valve/the second high-speed switch valve, the A ports of the first high-speed switch valve/the second high-speed switch valve of all the hydraulic cylinder units are connected through oil passages to form a high-pressure end/a low-pressure end of the system, and the high-speed switch valves I and the B ports of the second high-speed switch valve of all the hydraulic cylinder units are connected through oil passages and then are connected with the oil tank of the system. In the specific embodiment, rod cavities of the first group of the first sub-hydraulic cylinders 1.1 and the first group of the second sub-hydraulic cylinders 1.2 are connected through oil passages and then are connected to a P port of the first group of the high-speed switch valves 2.1, and rodless cavities of the first group of the first sub-hydraulic cylinders 1.1 and the first group of the second sub-hydraulic cylinders 1.2 are connected through oil passages and then are connected to a P port of the first group of the high-speed switch valves 2.2; the rod cavities of the first group of sub hydraulic cylinders 1.3 and the second group of sub hydraulic cylinders 1.4 are connected through oil passages and then are connected to the P port of the first group of high-speed switch valves 2.3, and the rodless cavities of the first group of sub hydraulic cylinders 1.3 and the second group of sub hydraulic cylinders 1.4 are connected through oil passages and then are connected to the P port of the second group of high-speed switch valves 2.4; the rod cavities of the first 1.5 and the second 1.6 sub-hydraulic cylinders of the third group are connected through oil passages and then are connected to the P port of the first 2.5 high-speed switch valve of the third group, and the rodless cavities of the first 1.5 and the second 1.6 sub-hydraulic cylinders of the third group are connected through oil passages and then are connected to the P port of the second 2.6 high-speed switch valve of the third group. A ports A of the first group of high-speed switch valves I2.1, the second group of high-speed switch valves I2.3 and the third group of high-speed switch valves I2.5 are connected through an oil way to form a system high-pressure end; the ports A of the first group of high-speed switch valves II 2.2, the second group of high-speed switch valves II 2.4 and the third group of high-speed switch valves II 2.6 are connected through oil passages to form a low-pressure end of the system; the ports B of the 6 high-speed switch valves are connected through oil passages and then are connected into an oil tank 3 of the system.

According to the pressure formula F ═ p × A, when the system working pressure p is constant, the total area A of the piston is changed by changing the number of the sub hydraulic cylinders of the hydraulic cylinder group connected to the system, so that the comprehensive acting force F output by the hydraulic cylinder group can be changed, and the damping force output by the shock absorber system is further changed. Three groups of sub hydraulic cylinders are distributed in sequence in the horizontal plane, and two sub hydraulic cylinders in each group of sub hydraulic cylinders are symmetrically distributed in the horizontal plane, so that a bilateral symmetrical supporting mechanism can be constructed, and the stability of an object on the supporting mechanism in the motion process is enhanced.

The piston areas of the sub hydraulic cylinders in each hydraulic cylinder unit are the same, and the piston areas of the sub hydraulic cylinders in different hydraulic cylinder units are different. In this embodiment, the diameters of the pistons of the first group of sub-hydraulic cylinders 1.1 and the first group of sub-hydraulic cylinders two 1.2 are both 32mm, the diameters of the pistons of the second group of sub-hydraulic cylinders 1.3 and the second group of sub-hydraulic cylinders two 1.4 are both 25mm, and the diameters of the pistons of the third group of sub-hydraulic cylinders 1.5 and the third group of sub-hydraulic cylinders two 1.6 are both 20mm, so that three section specifications of large, medium and small sections which are sequentially distributed are formed.

Control signals of the high-speed switch valve I and the high-speed switch valve II in the three hydraulic cylinder units are synchronous, the working positions of the high-speed switch valve I and the high-speed switch valve II in each hydraulic cylinder unit are the same, and the working positions of the high-speed switch valve I/the high-speed switch valve II in different hydraulic cylinder units are the same or different. In a specific embodiment, the switching valve actions of the first group of high-speed switching valves one 2.1 and the first group of high-speed switching valves two 2.2 are consistent, the switching valve actions of the second group of high-speed switching valves one 2.3 and the second group of high-speed switching valves two 2.4 are consistent, and the switching valve actions of the third group of high-speed switching valves one 2.5 and the third group of high-speed switching valves 2.6 are consistent. And the two states of the high-speed switch valve in each hydraulic cylinder unit are switched to control the motion states of the corresponding sub hydraulic cylinders, namely the sub hydraulic cylinders are switched into an oil tank or a system.

The system has eight different motion states according to different combinations of the piston areas of the accessed hydraulic cylinder groups, and the piston area of the digital control type hydraulic cylinder group accessed to the system loop can be changed through different piston area combination configurations, so that the damping force output by the shock absorber system is adjusted. Meanwhile, in the compression movement stroke, the system automatically selects the combined configuration with smaller piston area of the access system, so that the damping force output by the hydraulic cylinder group is reduced, and the function of the suspension spring is fully exerted; in the extension movement stroke, the system automatically selects the combination configuration with larger piston area of the access system, so that the damping force output by the hydraulic cylinder group is larger, and quick vibration reduction is realized. Therefore, the damping force of the system can change in a self-adaptive manner in a compression movement stroke and an extension movement stroke along with the change of the excitation force of the uneven road surface within a certain range, so that the system has better self-adaptive damping characteristics.

In practical application, the system represents different piston area states in a digital control code mode, when the high-speed switch valves corresponding to a pair of hydraulic cylinders are simultaneously '1', the system is accessed, and when the high-speed switch valves are simultaneously '0', the system is not accessed (namely, the oil tank 3 is accessed), and the digital control codes corresponding to eight different motion states corresponding to the system are shown in a table 1.

TABLE 1 digital control coding under different piston area conditions

Note: in the table, "1" indicates an access system, and "0" indicates no access system

When the code is 000, the digital hydraulic cylinder group is not accessed to the system and is in an invalid state; when the code is 001, the total area of the piston of the digital hydraulic cylinder group connecting system is minimum, and the damping force output by the hydraulic cylinder group is minimum; when the code is 111, the total area of the piston of the digital hydraulic cylinder group connecting system is maximum, and the damping force output by the hydraulic cylinder group is maximum at the moment.

The digital control type hydraulic cylinder group has the specific application process in the automobile electrohydraulic vibration damping energy feedback system as follows: under the action of the excitation force of an uneven road surface, the piston rods of the sub hydraulic cylinders of the hydraulic cylinder groups are pushed to simultaneously move in an extending and contracting manner, and the piston area of the digital control type hydraulic cylinder groups connected to a system loop is changed through the combined configuration of different piston areas, so that the damping force output by the shock absorber system is adjusted. In the compression movement stroke, the system is automatically switched to a digital control code (such as 001) corresponding to the combined configuration with smaller piston area of the access system, the damping force output by the hydraulic cylinder group is reduced, and the effect of a suspension spring can be fully exerted at the moment; during the extension stroke, the system is automatically switched to the digital control code (such as 110) corresponding to the combination configuration with larger piston area of the access system, and at the moment, the damping force output by the hydraulic cylinder group is larger, so that quick vibration reduction can be realized. The system is adaptive to and matched with a spring system of a suspension device, so that vibration can be effectively reduced, and the smoothness of a vehicle is improved.

Obviously, the number of the sub hydraulic cylinders and the size of the piston area of the integrated digital control type hydraulic cylinder group adopted by the invention can be selected in various ways and combined in different ways, and when N pairs of hydraulic cylinder groups are connected, the system has 2N motion states, and the more the number of the connected hydraulic cylinder groups is, the more the different combinations of the piston areas of the connected hydraulic cylinder groups are, the more the motion states of the system are, the more accurate the damping force adjustment of the system is, the better the smoothness of the automobile on an uneven road surface is, of course, the more the corresponding physical structure of the system is complicated, and the higher the requirement on the control stability of the control system is.

As shown in fig. 2, the rectifier bridge circuit includes a first check valve 4.1, a second check valve 4.2, a third check valve 4.3, and a fourth check valve 4.4, and the specifications of the four check valves are the same. The oil outlet of the one-way valve I4.1 and the oil inlet of the one-way valve II 4.2 are connected through an oil path and then are connected into a high-pressure end of the system, the oil outlet of the one-way valve III 4.3 and the oil inlet of the one-way valve IV 4.4 are connected through an oil path and then are connected into a low-pressure end of the system, the oil outlet of the one-way valve II 4.2 and the oil outlet of the one-way valve IV 4.4 are connected through an oil path and then are connected into the oil inlet of the hydraulic motor 7, and the oil inlet of the one-way valve I4.1 and the oil inlet of the one-way valve III 4.3 are connected through an oil path and then are connected into the oil outlet of the hydraulic motor 7. The oil inlet of the hydraulic motor 7 is connected with a high-pressure energy accumulator 5, the oil outlet of the hydraulic motor 7 is connected with a low-pressure energy accumulator 6, the output shaft end of the hydraulic motor 7 is in transmission connection with the rotating shaft of the generator 8, and the output end of the generator 8 is electrically connected with the input end of the storage battery 9.

When the automobile is excited by an uneven road surface, the piston rods of the sub hydraulic cylinders of the digital control type hydraulic cylinder group are pushed to simultaneously move in a telescopic mode under the action of the exciting force of the uneven road surface. In the compression movement stroke, the system is automatically switched to a digital control code corresponding to a combined configuration with a smaller piston area of the access system, and the damping force output by the hydraulic cylinder group is reduced. Taking the numerical control code 001 as an example, only the third group of hydraulic cylinder units are connected into the system, hydraulic oil in rodless cavities of the first 1.5 and second 1.6 hydraulic cylinders of the third group is pressed into a port P of the second 2.6 high-speed switch valve of the third group and then flows out through a port A, a check valve fourth 4.4 is in an open state, a check valve third 4.3 is in a closed state, the hydraulic oil in a high-pressure state flows into an oil inlet of the hydraulic motor 7, so that the hydraulic motor 7 is driven to rotate in a unidirectional and continuous manner to generate electricity, the generated electric energy is input into the storage battery 9 to be stored, and part of the oil pressure is buffered and stored through the high-pressure energy accumulator 5; and low-pressure oil liquid flowing out of the hydraulic motor 7 flows into an A port of a first high-speed switch valve 2.5 of the third group through a one-way valve 4.1, then flows back into rod cavities of a first hydraulic cylinder 1.5 of the third group and a second hydraulic cylinder 1.6 of the third group through a P port, and part of oil pressure is buffered and stored through a low-pressure energy accumulator 6.

In the extension movement stroke, the system is automatically switched to a digital control code corresponding to a combination configuration with a larger piston area of the access system, and the damping force output by the hydraulic cylinder group is larger at the moment. Taking the digital control code 100 as an example, only the first group of hydraulic cylinder units are connected into the system at this time, hydraulic oil in rod cavities of the first group of sub-hydraulic cylinders 1.1 and the first group of sub-hydraulic cylinders 1.2 is pressed into a port P of the first group of high-speed switch valves 2.1 and then flows out through a port A, the check valves 4.2 are in an open state, the check valves 4.1 are in a closed state, the hydraulic oil in a high-pressure state flows into an oil inlet of the hydraulic motor 7, so that the hydraulic motor 7 is driven to rotate in a unidirectional and continuous manner to generate electricity, the generated electric energy is input into the storage battery 9 to be stored, and part of the oil pressure is buffered and stored through the high-pressure energy accumulator 5; the low-pressure oil liquid flowing out of the hydraulic motor 7 flows into an A port of a first group of high-speed switch valves 2.2 through a check valve III 4.3, and then flows back into rodless cavities of a first group of sub hydraulic cylinders 1.1 and a first group of sub hydraulic cylinders 2.1 through a P port.

The oil liquid flows through the hydraulic motor 7 through the rectifier bridge loop to drive the generator 8 to generate electricity, mechanical energy of the wheels moving up and down under the action of the excitation force of the uneven road surface is converted into electric energy, and the electric energy is stored in the storage battery 9, so that the energy is recycled. In the process, no matter the compression movement stroke or the extension movement stroke, the hydraulic motor always rotates in one direction, and the rotation direction cannot be changed.

The system design and AMESim modeling simulation are carried out on the hydro-electric energy feedback shock absorber system based on the digital control type hydraulic cylinder group, and a dynamometer characteristic curve and a speed characteristic curve corresponding to different digital control type hydraulic cylinder group codes can be obtained, as shown in fig. 3 and fig. 4, respectively, it can be seen that the digital control type hydraulic cylinder group has different control codes and different damping forces, and the larger the total area of a piston corresponding to the control codes is, the larger the damping force is correspondingly.

The hydro-electric energy feedback shock absorber based on the digital control type hydraulic cylinder group is applied to the existing suspension system to form the novel energy feedback suspension. Respectively establishing system simulation models of a traditional suspension and a novel energy feedback suspension in AMESim, giving a section of sine wave excitation signal with the same frequency of 1Hz and amplitude of 0.05m for simplifying analysis, and carrying out comparative simulation analysis on the damping characteristics of the two suspensions to obtain damping characteristic curves as shown in figure 5. According to simulation results in the graph, the dynamic stroke of the novel energy feedback suspension is smaller than that of the traditional suspension, and the fact that the damping characteristic of the novel energy feedback suspension is superior to that of the traditional suspension can be verified. Therefore, compared with the prior art that the damping force is adjusted by changing the back electromotive force moment of the generator by connecting the energy feedback circuit and changing the adjustable load resistance or the current of the energy feedback circuit in the hydraulic electric type energy feedback shock absorber, the system is simpler and easy to control, and can reduce unnecessary energy loss.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.