Electric control liquid-gas support shock absorber
阅读说明：本技术 一种电控液气支撑减振器 (Electric control liquid-gas support shock absorber ) 是由 陈刚 于 2019-03-29 设计创作，主要内容包括：一种电控液气支撑减振器,其特征是：将电控阀连接在液压缸和液气储能器之间,液压缸内的压力即液压缸的支撑力值通过液气储能器和电控阀的阻尼值控制,液压缸和液气储能器之间设置检测液流流向的检测装置,用于检测实时液流方向是由液压缸流向液气储能器还是从液气储能器流向液压缸,用测力元件测量支撑减振器的实时支撑力值,控制组件将测力元件测得的支撑减振器的实时支撑力值与支撑减振器所需的最佳支撑力值(目标支撑力值)进行比较,并结合液流流向的检测装置检测到的流向信号双向控制电控阀的阻尼。该支撑减振器具有结构简单,部件少,阻尼控制方法简单,能实现减振器阻尼自动调节功能,达到阻尼自适应的目的。(An electronic control liquid-gas support shock absorber is characterized in that: the method comprises the steps that an electric control valve is connected between a hydraulic cylinder and a liquid-gas energy accumulator, the pressure in the hydraulic cylinder, namely the supporting force value of the hydraulic cylinder, is controlled through the damping values of the liquid-gas energy accumulator and the electric control valve, a detection device for detecting the flow direction of liquid flow is arranged between the hydraulic cylinder and the liquid-gas energy accumulator and is used for detecting whether the real-time liquid flow direction flows from the hydraulic cylinder to the liquid-gas energy accumulator or from the liquid-gas energy accumulator to the hydraulic cylinder, the real-time supporting force value for supporting the shock absorber is measured by a force measuring element, a control assembly compares the real-time supporting force value for supporting the shock absorber measured by the force measuring element with the optimal supporting force value (target supporting force value) required by supporting the. The support shock absorber has the advantages of simple structure, few components and simple damping control method, and can realize the automatic damping adjustment function of the shock absorber and achieve the aim of damping self-adaptation.)
1. An electrically controlled hydro-pneumatic support shock absorber comprising: the hydraulic-pneumatic power generation device comprises a liquid-gas energy accumulator, a liquid flow and liquid direction detection device, a hydraulic cylinder, a force measuring element, an electric control valve and a control assembly;
the method is characterized in that: the electric control valve is connected in series between the liquid-gas energy accumulator and the hydraulic cylinder, the force measuring element measures the supporting force value of the liquid-gas supporting shock absorber on a supported object, and the liquid flow direction is detected by the liquid flow direction detection device;
the control assembly compares the supporting force value measured by the force measuring element with a target force value, and outputs a control signal to bidirectionally control the damping of the electric control valve by combining a liquid flow direction signal measured by the liquid flow direction detection device so as to control the size of the supporting force value of the liquid-gas support shock absorber.
2. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1, wherein: the following damping control method is adopted:
when the real-time supporting force value is smaller than the target force value and the flow direction is detected to be that the liquid-gas energy accumulator flows to the hydraulic cylinder, the control assembly outputs a control signal to reduce the damping value of the electric control valve;
when the real-time supporting force value is smaller than the target force value and the flow direction is detected to be that the hydraulic cylinder flows to the liquid-gas energy accumulator, the control assembly outputs a control signal to increase the damping value of the electric control valve;
when the real-time supporting force value is larger than the target force value and the flow direction is detected to be that the hydraulic cylinder flows to the liquid-gas energy accumulator, the control assembly outputs a control signal to reduce the damping value of the electric control valve;
when the real-time supporting force value is larger than the target force value and the flow direction is detected to be that the liquid-gas energy accumulator flows to the hydraulic cylinder, the control assembly outputs a control signal to increase the damping value of the electric control valve.
3. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the electric control valve is a proportional electromagnet type electric control valve;
this proportion electro-magnet formula automatically controlled valve includes: the electric control valve comprises an electric control valve body, a valve core, a proportional electromagnetic coil and a spring;
the damping of the proportional electromagnet type electric control valve is controlled by the current of the proportional electromagnetic coil.
4. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the electric control valve is a magneto-rheological damper.
5. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the force measuring cell is mainly composed of a force sensor for measuring the supporting force of the shock absorber.
6. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the load cell is essentially constituted by a pressure sensor that measures the pressure of the liquid flow.
7. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the liquid flow and liquid direction detection device of the liquid-gas support shock absorber mainly comprises a permanent magnet slide valve and a flow direction detection valve body, wherein a reed pipe or a Hall element is arranged on the flow direction detection valve body;
when the permanent magnet slide valve moves upwards or downwards, the control assembly detects the liquid flow direction through signals of the reed pipe or the Hall element.
8. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the liquid flow and liquid flow direction detection device of the shock absorber mainly comprises a pressure sensor connected between an electric control valve and a hydraulic cylinder and a pressure sensor connected between the electric control valve and a liquid-gas energy accumulator, and a control assembly judges the flow direction of liquid flow according to the measured value of the pressure sensor.
9. An electrically controlled hydro-pneumatic support shock absorber as claimed in claim 1 or 2, wherein: the liquid flow direction detection device is composed of a differential pressure sensor which is connected with two sides of the electric control valve.
Technical Field
The invention relates to a liquid-gas support shock absorber, which is mainly used for an electric control variable damping type liquid-gas support shock absorber, such as a variable damping type shock absorber of a magneto-rheological shock absorber, an electro-rheological shock absorber, a proportional electromagnet shock absorber and the like.
Background
The technology of the shock absorber is directly related to the comfort and the safety of a vehicle in the running process, vehicles with different purposes have different requirements on the shock absorber, the damping control of the shock absorber is a function which is focused in the design and use process of the shock absorber, and whether the function of the shock absorber meets the requirement or not completely depends on the damping control capability.
Application No.: 201821209280.7, entitled "a support and vibration damping device and a vehicle employing the same", and application number: 201821229111.X, the patent name of a liquid-gas supporting vibration damper and a vehicle adopting the liquid-gas supporting vibration damper, discloses methods for controlling the damping force value of the vibration damper by controlling the damping force of the vibration damper according to the real-time supporting force value of the supporting vibration damper, and the method enables the supporting force value of the vibration damper to be close to a target force value or to the gravity of an object supported by the vibration damper, so that the aim of vibration damping is fulfilled. Several schemes for damping control of hydro-pneumatic support shock absorbers are also disclosed. In the known technical scheme, the damping control of the hydro-pneumatic support shock absorber is two-way control, namely one section of a path through which the liquid flow of the shock absorber flows back and forth is not shared, two groups of damping valves and two groups of auxiliary components are needed, namely, an oil inlet and an oil outlet are respectively controlled by adopting different damping valves or respectively controlled by adopting different oil ways, the structure of the hydraulic support shock absorber is relatively complex, the single damping valve can only be selected from two types of stretching damping control or compression damping control to achieve optimal control, namely, the single damping valve can only achieve single optimal control on the stretching damping or single optimal control on the compression damping.
Technical problem to be solved by the invention
One, a single flow path or a single damper valve does not provide better control of the optimal adjustment of damping in both extension and compression of the cylinder. That is, the use of a single flow path or a single damper valve does not allow optimal damping control of both the flow into the cylinder and the flow out of the cylinder.
Secondly, the existing scheme can not detect the flow direction, and the flow path needs to be divided into a liquid inlet oil path and a liquid outlet oil path, so that the oil path of the hydraulic system is complex and high in cost.
Thirdly, the existing damping control method has the disadvantages of complex structure, more parts and high cost.
Technical scheme of the invention
The hydraulic and pneumatic energy accumulator is used as an elastic energy storage element, the hydraulic cylinder is used as a kinetic energy and potential energy conversion executing element, the electric control valve is connected between the hydraulic cylinder and the hydraulic and pneumatic energy accumulator, the pressure in the hydraulic cylinder, namely the supporting force value of the hydraulic cylinder, is controlled by the damping values of the hydraulic and pneumatic energy accumulator and the electric control valve, a detection device for detecting the flow direction of liquid flow is arranged between the hydraulic cylinder and the hydraulic and pneumatic energy accumulator and is used for detecting whether the real-time liquid flow direction flows from the hydraulic cylinder to the hydraulic and pneumatic energy accumulator or from the hydraulic and pneumatic energy accumulator to the hydraulic cylinder, the real-time supporting force value of the supporting shock absorber is measured by the force measuring element, the control component compares the real-time supporting force value of the supporting shock absorber measured by the force measuring element with the optimal supporting force value (target supporting force value) required by the supporting shock absorber, to make it maximally close to the target force value.
Detailed description of the invention
Target support force value: the supporting force value to be achieved by the supporting shock absorber can be a force value set according to the actual requirement of supporting shock absorption, and can also be an approximate gravity value of a supported object supported by the supporting shock absorber, and the approximate gravity value of the supported object can be measured by a force measuring element, for example, the average supporting force value of the supporting shock absorber in a certain unit time period is used as a target supporting force value or the approximate gravity value of the supported object supported by the supporting shock absorber.
Liquid-gas energy storage: also known as accumulators or accumulators are energy storage elements that use gas as an elastic medium.
Liquid flow and liquid direction detection device: for detecting the direction of flow of the fluid, the fluid flow direction detection means is herein used to detect or determine whether the fluid is flowing from the hydraulic cylinder to the liquid-gas accumulator or from the liquid-gas accumulator to the hydraulic cylinder. Any device capable of determining the direction of a liquid flow, such as a mechano-electric induction flow sensor, a differential pressure sensor, or a pressure sensor, may be used as the liquid flow direction detecting device. The method for detecting the flow direction of liquid flow by the pressure sensors is to connect the two pressure sensors at two ends of the electric control valve, because when the liquid flow flows through the damped electric control valve, differential pressure is formed at two ends of the electric control valve, so that the signal sizes of the two pressure sensors are different, the control assembly compares the signals of the two pressure sensors, and the flow direction of the liquid flow is determined to be from high pressure to low pressure, so as to judge the flow direction of the liquid flow.
A force measuring element: refers to a component that can directly or indirectly measure pressure or force, such as a pressure sensor, a force sensor, etc. When the pressure sensor measures the supporting force value of the supporting shock absorber, the calculation needs to be carried out by combining parameters such as the area of a piston of the hydraulic cylinder.
An electric control valve: the component is controlled by current or voltage and has damping action or shutoff action on liquid flow or air flow, and comprises a magnetorheological damper, an electrorheological damper, an electromagnetic valve, a proportional electromagnet type electric control valve and the like. The main function of the electric control valve in the support shock absorber is to damp the liquid flow, so as to adjust the support force value of the support shock absorber. The liquid flow medium corresponding to the electric control valve adopting the magneto-rheological damper or the electro-rheological damper is magneto-rheological fluid or electro-rheological fluid.
A control component: the function of the control component is to receive and process signals of the sensor and other signals needing setting or processing, and output damping control signals to control the damping value of the electric control valve. The control assembly has the functions of receiving a real-time force value or a real-time pressure value measured by the force measuring element, receiving a flow direction signal value measured by the liquid flow direction detection device and the like, calculating and determining a gravity value and a target force value or a target pressure value of a support object supporting the shock absorber, comparing the real-time measured value with the target value, and outputting a control signal according to a comparison result and a liquid flow direction signal and according to a control requirement to control the damping of the electric control valve.
The damping control method of the support shock absorber with the hydraulic flow direction detection device comprises the following steps:
when the real-time supporting force value is smaller than the target force value and the flow direction is detected to be that the liquid-gas energy accumulator flows to the hydraulic cylinder, the hydraulic pressure in the liquid-gas energy accumulator is larger than the hydraulic pressure in the hydraulic cylinder, the control assembly outputs a control signal to reduce the damping value of the electric control valve at the moment, so that the real-time supporting force value is increased, and the hydraulic cylinder is in a stretching motion state.
When the real-time supporting force value is smaller than the target force value and the flow direction is detected to be that the hydraulic cylinder flows to the liquid-gas energy accumulator, the hydraulic pressure in the liquid-gas energy accumulator is smaller than the hydraulic pressure in the hydraulic cylinder, the control assembly outputs a control signal to increase the damping value of the electric control valve at the moment, so that the real-time supporting force value is increased, and the hydraulic cylinder is in a contraction motion state.
When the real-time supporting force value is larger than the target force value and the flow direction is detected to be that the hydraulic cylinder flows to the liquid-gas energy accumulator, the control assembly outputs a control signal to reduce the damping value of the electric control valve, so that the liquid-gas energy accumulator absorbs energy as much as possible, and the hydraulic cylinder is in a contraction motion state.
When the real-time supporting force value is larger than the target force value and the flow direction is detected to be that the liquid-gas energy accumulator flows to the hydraulic cylinder, the hydraulic pressure in the liquid-gas energy accumulator is larger than the hydraulic pressure in the hydraulic cylinder, the control assembly outputs a control signal to increase the damping value of the electric control valve at the moment, so that the real-time supporting force value is reduced, and the hydraulic cylinder is in a stretching motion state.
The working principle is as follows:
when the current of the electromagnet is small or no current exists, the electromagnetic valve core is close to the right under the action of the spring force, the damping is the maximum value, when the current of the electromagnet is gradually increased, the electromagnetic valve core moves leftwards under the action of the electromagnetic force, the larger the current is, the larger the left movement amount of the electromagnetic valve core is, the larger the effective drift diameter of the valve is, the smaller the damping is, namely the damping of the valve is gradually reduced along with the increase of the current, and therefore the damping value of the electric control valve is controlled.
The method for detecting the flow direction of the liquid flow by using the flow direction detection device formed by the pressure sensor comprises the following steps: the pressure sensors are respectively connected with two ends of the electric control valve, namely one sensor is connected between the liquid-gas energy accumulator and the electric control valve, and the other sensor is connected between the hydraulic cylinder and the electric control valve. When the differential pressure signal detected by the control assembly is smaller than a certain set value (such as 0.02MPa), and the control signal output by the control assembly enables the damping value of the electric control valve to be lower than a certain value (such as the damping value is lower than 2% of the maximum damping), the control assembly outputs the control signal to increase the damping value of the shock absorber to a certain set value (such as the damping value is set to 2% of the maximum damping) so as to maintain the accuracy of differential pressure judgment, thereby ensuring the accuracy of flow direction detection and damping control.
In order to avoid the occurrence of inaccurate flow direction determination caused by inaccurate differential pressure measurement due to measurement errors of the differential pressure sensor, as in the method adopted in the
The invention has the advantages of
Firstly, a single liquid flow path or a single electric control valve can realize the optimal regulation and control effect on the damping of the hydraulic cylinder in the stretching and compressing processes according to the damping control requirement.
And secondly, by detecting the flow direction of the liquid flow, the liquid-gas support shock absorber can adjust the damping of the electric control valve in real time according to the flow direction of the liquid flow so as to achieve the optimal damping control requirement.
And thirdly, the damping control is simpler and more practical, the variable damping control is easier to realize, and the damping self-adaptive function is easier to realize.
Fourthly, the liquid-gas support shock absorber is simpler in structure, fewer in parts and lower in cost.
Drawings
FIG. 1: liquid-gas support shock absorber with flow direction detection device
FIG. 2: take differential pressure formula flow direction detection device's liquid gas to support shock absorber
FIG. 3: liquid-gas support shock absorber with pressure sensor as flow direction detection device
FIG. 4: proportional electromagnet type electric control valve
FIG. 5: magnetic induction type liquid flow direction detection device (not suitable for liquid-gas support damper using magneto-rheological fluid)
FIG. 6: FIG. 5A sectional view of a valve body of a magnetic induction type liquid flow direction detecting apparatus (A-A sectional view)
Graphic numbering name
1-gas storage chamber 2-liquid gas energy storage device 3-liquid storage chamber 4-pipeline 5-damping control line 6-controller
7-differential pressure signal line 8-force transducer signal line 9-force transducer 10-hydraulic cylinder
11-electric control valve 12-differential pressure sensor 13-pressure sensor 14-pressure sensor signal line
15-liquid flow direction detection device 16-flow direction detection signal line 17-proportional solenoid 18-valve core
19-electric control valve body 20-liquid flow path 21-liquid path interface 22-flow direction detection valve body
23-valve connector 24-spring 25-permanent magnet slide valve 26-reed pipe or hall element.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
This liquid gas supports shock absorber includes: the device comprises a liquid-gas energy storage device (2), a liquid flow direction detection device (15), a pressure sensor (13), a hydraulic cylinder (10), an electric control valve (11) and a controller (6).
The flow direction detection device can adopt a magnetic induction type liquid flow direction detection device shown in fig. 5 and 6, and the liquid flow direction detection device mainly comprises: the flow direction detection valve comprises a flow direction detection valve body (22), a permanent magnet sliding valve (25), a spring (24), a valve joint (23) and a reed pipe or Hall element (26). When the liquid flow is static or flows downwards in the figure, the permanent magnet slide valve (25) is kept in a neutral position by a spring force or pushed to the lower part of the figure by the action of the liquid flow force, and the reed switch or the Hall element (26) has no signal; when the liquid flows upwards, the permanent magnet slide valve (25) is pushed to the upper part of the figure by the action of the liquid force, and a reed switch or a Hall element (26) detects a magnetic signal and transmits the magnetic signal to the controller (6) to determine the liquid flow direction.
The working principle is as follows:
a liquid flow direction detection device (15) and an electric control valve (11) are connected between a liquid-gas energy storage device (2) and a hydraulic cylinder (10) in series, the electric control valve (11) can adopt a magneto-rheological damper or a proportional electromagnet type electric control valve shown in figure 4, a pressure sensor (13) is connected between the hydraulic cylinder (10) and the electric control valve (11), the pressure sensor (13) measures the pressure in the hydraulic cylinder (10) and transmits a pressure signal to a controller (6) through a pressure sensor signal line (14), and the liquid flow direction detection device (15) transmits a liquid flow direction signal to the controller (6) through a flow direction detection signal line (16). The controller (6) calculates a real-time supporting force value for supporting the shock absorber and an average supporting force value in unit time according to the pressure signal, compares the calculated average supporting force value in unit time as a target supporting force value for supporting the shock absorber with the real-time supporting force value, and outputs a control signal to control a damping value of the electric control valve (11) by combining a liquid flow direction signal so that the supporting force value for supporting the shock absorber is close to or equal to the target supporting force value.
The damping control method comprises the following steps:
when the real-time supporting force value is smaller than the target force value and the flow direction is detected to be that the liquid-gas energy accumulator (2) flows to the hydraulic cylinder (10), the hydraulic pressure in the liquid-gas energy accumulator (2) is larger than the hydraulic pressure in the hydraulic cylinder (10), the controller (6) outputs a control signal to reduce the damping value of the electric control valve (11), so that the real-time supporting force value is increased, and the hydraulic cylinder (10) is in a stretching motion state.
When the real-time supporting force value is smaller than the target force value and the flow direction is detected to be that the hydraulic cylinder (10) flows to the liquid-gas energy accumulator (2), the hydraulic pressure in the liquid-gas energy accumulator (2) is smaller than the hydraulic pressure in the hydraulic cylinder (10), the controller (6) outputs a control signal to increase the damping value of the electric control valve (11), so that the real-time supporting force value is increased, and the hydraulic cylinder (10) is in a contraction motion state.
When the real-time supporting force value is larger than the target force value and the flow direction is detected to be that the hydraulic cylinder (10) flows to the liquid-gas energy storage device (2), the controller (6) outputs a control signal to reduce the damping value of the electric control valve (11) at the moment, so that the liquid-gas energy storage device (2) absorbs energy as much as possible, and the hydraulic cylinder (10) is in a contraction motion state.
When the real-time supporting force value is larger than the target force value and the flow direction is detected to be that the liquid-gas energy accumulator (2) flows to the hydraulic cylinder (10), the hydraulic pressure in the liquid-gas energy accumulator (2) is larger than the hydraulic pressure in the hydraulic cylinder (10), the controller (6) outputs a control signal to increase the damping value of the electric control valve (11), so that the real-time supporting force value is reduced, and the hydraulic cylinder (10) is in a stretching motion state.
An electrically controlled valve of the proportional solenoid type (as shown in fig. 4), comprising: an electric control valve body (19), a valve core (18), a proportional electromagnetic coil (17) and a spring (24). The working principle is as follows: when the current of the proportional solenoid coil (17) is small or no current exists, the valve core (18) of the electromagnetic valve is close to the right under the action of the spring force, the damping is the maximum value, when the current of the proportional solenoid coil (17) is gradually increased, the valve core (18) of the electromagnetic valve moves leftwards under the action of the electromagnetic force, the larger the current is, the larger the left movement amount of the valve core (18) of the electromagnetic valve is, the larger the effective path diameter of the valve is, the smaller the damping is, namely the damping of the valve is gradually reduced along with the increase of the current, and therefore the damping.
This liquid gas supports shock absorber includes: the device comprises a liquid-gas energy storage device (2), a flow direction detection device consisting of a differential pressure sensor (12), a force measuring sensor (9), a hydraulic cylinder (10), an electric control valve (11) and a controller (6).
The working principle is as follows:
an electric control valve (11) is connected in series between the liquid-gas energy accumulator (2) and the hydraulic cylinder (10), a differential pressure sensor (12) is connected to two sides of the electric control valve (11), the differential pressure sensor (12) measures a differential pressure value at two ends of the electric control valve (11) and transmits a differential pressure signal to the controller (6) through a differential pressure signal line (7), and a force measuring sensor (9) transmits a real-time measured force value to the controller (6) through a force measuring sensor signal line (8). The controller (6) calculates a real-time supporting force value and an average supporting force value in unit time according to the measured value of the force measuring sensor (9), compares the calculated average supporting force value in unit time as a target supporting force value for supporting the shock absorber with the real-time supporting force value, and controls the damping value of the electric control valve (6) by combining a flow direction signal obtained by judging according to the pressure difference signal so that the supporting force value for supporting the shock absorber is close to or equal to the target supporting force value.
The damping control method is the same as that adopted in the
This liquid gas supports shock absorber includes: the hydraulic control system comprises a liquid-gas energy storage device (2), a flow direction detection device consisting of a pressure sensor (13), a hydraulic cylinder (10), an electric control valve (11) and a controller (6).
The working principle is as follows:
an electric control valve (11) is connected in series between the liquid-gas energy accumulator 92) and the hydraulic cylinder (10), pressure sensors (13) are respectively connected to two sides of the electric control valve (11), and the pressure sensors (13) measure pressure values of two sides of the electric control valve (11) and transmit pressure signals to the controller (6) through pressure sensor signal wires (14). The controller (6) calculates a real-time supporting force value according to the measured value of the pressure sensor (13), calculates an average supporting force value in unit time, and judges the flow direction of the liquid flow; and comparing the calculated average supporting force value in unit time serving as a target supporting force value for supporting the shock absorber with the real-time supporting force value, and controlling the damping value of the electric control valve by combining the flow direction of the liquid flow to enable the supporting force value for supporting the shock absorber to be close to or equal to the target supporting force value.
The damping control method is the same as that adopted in the
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