• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    PRESSURE-SENSITIVE HOSE ARRANGEMENT AND METHOD OF DETECTION OF INTERNAL PRESSURE IN A HOSE ARRANGEMENT. A pressure sensitive hose arrangement and method for using it is presented. In an exemplary aspect, the pressure sensitive hose arrangement includes a hose arrangement that includes a hose having a first and second conductive layer and a circuit electrically connected to the first and second conductive layer of the hose arrangement. The circuit generates an electrical response through the first and the second conductive layer of the hose arrangement. The pressure sensitive hose arrangement also includes a computer system configured to receive the electrical response and estimate the pressure within the hose arrangement, based on the electrical response.
    公开号:BR112013012673B1
    申请号:R112013012673-6
    申请日:2011-11-22
    公开日:2020-11-03
    发明作者:Luis R. Pereira；Hassdan Al-Atat；Mark A. Juds
    申请人:Eaton Corporation；
    IPC主号:
    专利说明:

    Field of invention
    [0001] This disclosure relates to methods and systems for measuring the characteristics of a hose. In particular, the present disclosure relates to a pressure sensitive hose. History of the invention
    [0002] High pressure reinforced hydraulic hoses are typically used in several hydraulic operated machines, such as earthmoving machines, to provide a flexible connection between various moving parts of a hydraulic circuit employed on or within the machine. Such hoses may include a hollow polymeric inner tube, in which successive cylindrical layers of reinforcement material, such as wire or fabric, are concentrically applied to contain the radial and axial pressures developed within the inner tube.
    [0003] Many applications have required constructions with high resistance to breaking and with resistance to fatigue in the long term. Using conventional technology, it is possible to increase the breaking strength in a hose design by adding additional materials and / or layers of reinforcement, a practice that is generally not supported due to its negative impact on flexibility of the hose, or by the universal increase of the tensile strength of each layer of reinforcement material, which can occur at the expense of the fatigue resistance of the hose.
    [0004] An impulse test measures the failure of resistance to fatigue in the design of a hose, cyclically subjecting the hose to hydraulic pressure. A burst test, on the other hand, is a destructive test used to determine the extreme strength of a hose, increasing the internal pressure, evenly, until failure. Based on these and other tests, a manufacturer can estimate the life of a hose, which can be used to determine when a hose has reached the end of its life, and may require replacement.
    [0005] In some circumstances, it will be desirable to detect, in a non-destructive and non-disruptive manner, the possibility of a hose failure. A solution that provides this capability is discussed in U.S. Patent No. 7,555,936, and discloses the connection to a monitoring circuit between two parallel layers, at least partially conductive, of a hose wall. A change in an electrical property observed by that monitoring circuit could indicate a change in a property of the structure of the hose wall, capable of indicating an imminent failure of the hose wall. However, even in this solution, it can be difficult to determine if the altered electrical property is in fact due to a change in a physical characteristic of the hose wall, or if the change in electrical property is due to a change in the electronic detection parts, the a change in an electrical property of a wire harness that connects the monitoring circuit to the hose wall, or simply a degradation of an electrical connection to the hose wall. In these cases, there may be a change in an observed electrical property, even when the integrity of the hose wall is not compromised, but is instead due to a change in position or pressure within the hose. This is because the existing solutions do not take into account the internal pressure of a hose, either for monitoring purposes, or to compensate for the effects of pressure on the fault detection circuits. Summary of the invention
    [0006] In a first exemplary aspect, a pressure-sensitive hose arrangement includes a hose arrangement, which includes a hose having a first and a second conductive layer and a circuit electrically connected to the first and second conductive layer of the hose. The circuit generates an electrical signal through a first and a second conductive layer of the hose arrangement, which generates an electrical response to the electrical signal. The pressure sensitive hose arrangement also includes a computer system configured to receive the electrical response and estimate the pressure within the hose arrangement, based on the electrical response.
    [0007] In a second exemplary aspect, a method for detecting the internal pressure of a hose arrangement includes applying an electrical signal to a hose arrangement and calculating at least one electrical property of the hose arrangement, based on a response from the hose arrangement to the electrical signal. The method also includes estimating the pressure within the hose arrangement based on the electrical response.
    [0008] In a third exemplary aspect, a method of detecting the internal pressure of a hose arrangement includes applying a voltage through the first and second concentric conductive layer of a hose arrangement, separated by an elastomeric insulating layer, and determining the voltage drop across the hose arrangement. The method also includes calculating the resistance and capacitance of the hose arrangement based on the voltage drop across the hose arrangement, and estimating the change in the wall thickness of the hose arrangement, based, at least in part, on the resistance and capacitance. The method also includes the application of a hysteresis model to the change in the estimated wall thickness, in order to estimate the pressure within the hose arrangement. Brief description of the drawings
    [0009] Figure 1 is a partial cross-sectional view of an exemplary hose arrangement, employing a fault detector with exemplary characteristics of aspects in accordance with the principles of the present disclosure;
    [0010] Figure 2 is a perspective view, partially cut, illustrating an exemplary hose that employs a conductive braided layer, suitable for use with the hose arrangement of figure 1;
    [0011] Figure 3 is a perspective view, partially cut, illustrating an exemplary hose that employs a conductive spiral wire layer, suitable for use with the hose arrangement of figure 1;
    [0012] Figure 4 is a schematic cross-sectional view of a model of the hose arrangement of figures 1-3;
    [0013] Figure 5 is a schematic electrical model of the hose arrangement in figure 4;
    [0014] Figure 6 is a schematic axial sectional view of part of a hose arrangement, according to an exemplary configuration;
    [0015] Figure 7 is a schematic cross-sectional view of a pressurized hose arrangement model;
    [0016] Figure 8 is a schematic electrical model of a pressurized hose arrangement;
    [0017] Figure 9 is a hysteresis model, illustrating the responsiveness to the elasticity of an insulation layer included in a hose arrangement, according to the configurations of the present disclosure;
    [0018] Figure 10 is a graph showing an exemplary inlet pressure wave applied to a hose arrangement;
    [0019] Figure 11 is a graph that illustrates a change in voltage observed in a hose, in response to the pressure wave inlet in Figure 11;
    [0020] Figure 12 is a graph that illustrates exemplary hysteresis curves that illustrate the responsiveness of an insulating layer included in a hose arrangement based on the inlet pressure wave of figure 11;
    [0021] Figure 13 is a flow chart of a method for detecting and computing the internal pressure of a hose arrangement, according to an exemplary configuration;
    [0022] Figure 14 is a graph showing an exemplary inlet pressure wave applied to a hose arrangement;
    [0023] Figure 15 is a graph illustrating an exemplary measured voltage response of a hose arrangement in response to the inlet pressure wave of figure 14;
    [0024] Figure 16 is a graph that illustrates the estimated thickness of an elastomer layer positioned between conductive layers, based on the measured tension shown in figure 15;
    [0025] Figure 17 is a graph that illustrates the estimated pressure within a hose arrangement, after applying a hysteresis model in the thickness calculations shown in figure 16. Detailed description of the drawings
    [0026] Detailed references will now be made to the exemplary aspects of this disclosure, illustrated by the attached drawings. Where possible, the same reference numbers will be used, throughout the drawings, to refer to the same or similar structures.
    [0027] In general, the present disclosure relates to methods and systems for determining the internal pressure of a hose arrangement. According to several configurations discussed here, a hose arrangement including concentric conductive layers can be modeled as a coaxial cable that has an electrical response capable of changing with pressure. Due to the effects of the hysteresis of an elastomer layer between the conductive layers, it is possible to estimate the pressure present within the hose arrangement, based on the electrical response of the hose, over time. This allows the user of a hydraulic hose to monitor the pressure inside the hose with reasonable accuracy and without requiring a pressure gauge or other separate instrument.
    [0028] Now with reference to figure 1, an exemplary hose monitoring system, generally designated as 10, is shown. The hose monitoring system 10 includes a hose arrangement, generally referred to as 12, and a monitoring arrangement 14 in electrical and physical communication with the hose arrangement 12. The hose monitoring system 10 can be used, for example, example, to determine present operational characteristics of the hose arrangement 12, such as the current pressure within the hose arrangement 12, or to monitor the degradation and / or failures of the hose arrangement.
    [0029] The hose arrangement 12 includes a hose, generally designated as 16, which has multiple layered construction. In the exposed configuration, hose 16 is generally flexible and includes an inner tube 18 made of polymeric material, such as rubber or plastic, or other material, depending on the needs of the specific application, a first conductive layer 20, an intermediate layer 22 , a second conductive layer 24 and an outer coating 26. The first and second conductive layer 20, 24 define an electrical characteristic of the hose arrangement 12, such as capacitance, inductance and / or resistance (impedance).
    [0030] In the exposed configuration, the first conductive layer 20 overlaps the inner tube 18 and the intermediate layer 22 overlaps the first conductive layer 20. The second conductive layer 24 overlaps the intermediate layer 22. The first and the second conductive layer 20, 24 can be configured as reinforcement layers. The outer coating 26 can overlap the second conductive layer 24, and can include, for example, an extruded rubber or plastic layer. The outer shell 26 may itself include a reinforcement layer.
    [0031] The intermediate layer 22 operates to electrically isolate, at least partially, the first and the second conductive layer 20, 24, from each other. The intermediate layer 22 can have any of a variety of constructions. For example, the intermediate layer 22 may consist of a single layer of an electrically resistant material. The intermediate layer 22 can also consist of multiple layers, characterized by the fact that at least one of the layers exhibits insulating properties. Certain composite materials can also be used in the intermediate layer 22, such as fabric bonded to a polymeric material. Materials composed of several other constructions may also be used. Composite materials can also be used in combination with other materials, to form an intermediate layer 22.
    [0032] The first and second conductive layers 20, 24 generally extend over the entire length and cover the entire circumference of the hose. This is generally the case when the conductive layer also acts as a reinforcement layer. The intermediate layer 22 can also extend over the entire length and circumference of the hose. There will be times, however, where at least one, between the first and the second conductive layer 20, 24, will extend only over part of the length of the hose and / or part of its circumference. In this case, the intermediate layer 22 can also be configured to extend, in general, over the region of the hose containing the partial conductive layer 20, 24. The intermediate layer 22 can be positioned inside the hose, in order to separate the first and the second conductive layer 20, 24, one from the other.
    [0033] Now with reference to figures 2 and 3, the first and second conductive layer 20, 24 may include, for example, a braided conductive reinforcement material, as shown in figure 2, or alternating layers of spiral reinforcement material electrically conductive, as shown in figure 3. The braided reinforcement material can consist of a single layer or can include multiple layers. Although a two-wire spiral reinforcement arrangement is shown in figure 3, it should be noted that other configurations, such as four and six wire arrangements can also be used.
    [0034] The first and second conductive layer 20, 24 can each have the same configuration, or each layer can be configured differently. For example, the first and second conductive layer 20, 24 may each include the braided material shown in Figure 2, or one between the first and second conductive layer 20, 24 may include the braided material, whereas the other, between the first and the second conductive layer 20, 24, may include the spiral reinforcement material shown in figure 3. Additionally, the first and second conductive layer 20, 24 may include a canvas or multiple sheets of reinforced material. The first and second conductive layer 20, 24 may comprise metal wires, natural or synthetic fibers and fabrics and other reinforcement materials, provided that the selected material is electrically conductive.
    [0035] Again with reference to figure 1, the hose arrangement 12 can include a hose connection, generally designated as 30, for fluidly coupling the hose 16 to another component. The hose connection 30 may have any of a variety of different configurations, depending, at least in part, on the needs of the specific application.
    [0036] In the exposed configuration, the hose connection 30 includes a nozzle, generally referred to as 32, which engages inside the hose 16 and a socket, generally designated as 34, which engages the external side of the hose 16. The nozzle 32 includes an elongated cylindrical end part 36 that mates with the inner tube 18 of the hose 16. A cylindrical end part 38 of the socket 34 is coupled to the outer shell of the hose 16. The socket 34 and the nozzle 32 can be made of an electrically conductive material.
    [0037] The socket 34 and the nozzle 32 can be attached to the hose 16 by crimping the final part 38 of the socket 34, superimposed on the hose 16. The crimping process deforms the final part 38 of the socket 34, compressing, in this way, the hose 16 between the nozzle 32 and the socket 34. In the exposed configuration, the parts of the nozzle 32 and the socket 34 coupled to the hose 16 include a series of toothed edges which are at least partially involved in the relatively softer material of the hose , when socket 34 is crimped, helping to secure hose connection 30 to hose 16. The serrated edges can be configured to prevent the serrated edges from penetrating the inner tube and outer shell, and contact the first and second conductive layer 20, 24.
    [0038] In the exposed configuration, socket 34 includes a circumferential tongue 40 extending internally, positioned close to an end 42 of socket 34, adjacent to an end 44 of hose 16. The tongue 40 engages a corresponding circumferential groove 46, formed in the nozzle 32, to attach the socket 34 to the nozzle 32. The end 42 of the socket 34 that has the tongue 40 is initially formed wider than the nozzle 32 to allow the socket 34 to be installed in the nozzle 32. During the assembly process, the end 42 of the socket 34 is crimped, which deforms the socket 34 and forces the tongue 40 to engage in the corresponding groove 46 of the nozzle 32. The socket 34 can be electrically isolated from the nozzle 32 by positioning a collar electrically insulating 48 between socket 34 and nozzle 32 at the point where tongue 40 engages groove 46.
    [0039] The hose connection 30 also includes a nut 50 coupled to the nozzle 32. The nut 50 provides a means of securing the hose arrangement 12 to another component.
    [0040] The first conductive layer 20 can be configured to extend beyond the end of the inner tube of the hose 16. The first conductive layer 20 can be coupled to the nozzle 32 to create an electrical connection between the nozzle 32 and the first layer conductive 20. Similarly, the second conductive layer 24 can be configured to extend beyond the end of the outer sheath of hose 16. The second conductive layer 24 can be coupled to socket 34 to create an electrical connection between socket 34 and the second conductive layer 24.
    [0041] To help prevent the parts of the first and second conductive layer 20, 24, extending beyond the end of the hose 16 from contacting each other, an electrically insulating spacer 52 can be positioned between the exposed ends of the first and second conductive layer 20, 24. Spacer 52 can be integrally formed, as part of collar 48 used to electrically insulate socket 34 from nozzle 32. Spacer 52 can also be formed, extending intermediate layer 22 of the hose 16 in addition to one end of the inner tube 18 and the outer shell 26. The spacer 52 can also be configured as a separate component, separate from the collar 48 and the intermediate layer 22 of the hose 16.
    [0042] The monitoring arrangement 14 can have any one, among a variety of configurations. In general, the monitoring arrangement 14 is connectable over a part of the hose arrangement 12, particularly the part illustrated in figure 1. The monitoring arrangement 14, when installed over the hose arrangement 12, forms a physical and electrical connection with the hose arrangement 12, and particularly with nozzle 32 and socket 34, respectively. In general, the monitoring arrangement 14 detects an electrical characteristic of the hose arrangement 12, while validating the connection to the nozzle 32 and socket 34. An exemplary monitoring arrangement 14 is described in more detail below, in relation to figures 4- 17.
    [0043] Referring now to figures 4-5, schematic representations of the hose arrangement 12 and a monitoring circuit that can be included in the monitoring arrangement 14 are provided. Figure 4 shows a schematic, physical, cross-sectional representation of a hose arrangement 100. The hose arrangement 100 appears schematically as a coaxial cable, with a first and a second concentric conductive layer 102, 104, respectively. The first and second conductive layer 102, 104 may, in some configurations, correspond to layers 20, 24 of figures 1-3, above.
    [0044] An elastomeric layer 106 is attached between the first and the second conductive layer 102, 104, and acts as an insulator, electrically separating the layers. Likewise, and as shown in figure 5, hose arrangement 100 can be represented as a parallel capacitor 140 and resistor 120 (i.e., modeled on a coaxial cable arrangement).
    [0045] It should be noted that in figure 4, the front parts of the conductive layers 102, 104 separated by the elastomeric layer 106, will act as separate capacitor plates, with a separate resistive component. Likewise, as shown in figure 5, a monitoring circuit 200 can take the form of a resistance (Vsθnsor) 202 or resistance (Rsensor) 204 applied to the first conductive layer, and a response can be detected in the second conductive layer. Thus, a voltage (Vmangueira) at the point between resistance 204 and hose arrangement 100 (schematically represented by resistor 120 and capacitor 140 parallel) indicates the proportion of the general voltage (Vsensor) 202 attributable to a drop along the resistance (Rsensor ) 204 or along hose arrangement 100.
    [0046] To assess the electrical response of the hose arrangement in figures 4-5, several physical characteristics of the hose arrangement are taken into account, including the resistivity (p) of the elastomeric layer 106, as well as the permissiveness (e) of the elastomer , and the length (L) of the hose. In addition, the radial position of the conductive layers 102, 104 is also considered (distances a and b, respectively). Thus, when a DC voltage, such as voltage (Vsensor) 202 is applied to monitoring arrangement 200, resistor (Rmangueira) 120 and capacitor (Cmangueira) 140 can be represented by the following equations:

    [0047] Thus, based on the change in distances a and b, as the pressure within the hose arrangement 100 increases, the resistance 120 of the hose arrangement 100 decays, but the capacitance 140 increases.
    [0048] Furthermore, due to the capacitive effect of the hose arrangement 100, the hose arrangement has an electrical characteristic that is responsive to changes in voltage over time. Particularly, when a voltage is initially applied, the voltage response along the hose, as a function of time, can be represented by the equation of the voltage divider and the RC circuit expressed below:

    [0049] Likewise, when the switch is closed, the current that passes through the capacitor will increase and exponentially decrease until the capacitor is fully charged to the normalized (DC) voltage. The time it takes the capacitor to charge to the normalized voltage is dependent on the time constant i, which can be detected from:

    [0050] Although the model described in figures 4-5 provides an accurate estimate of the electrical response of a hose arrangement, in a case where conditions remain constant, it does not take into account changes in the electrical properties of a hose arrangement , in case of pressure changes within the hose arrangement. In particular, when the fluid passes through the hose, it exerts internal pressure on the walls of the hose. The internal pressure will strain the walls of the hose, thus causing the walls to contract. As illustrated in figures 6-9, several geometric characteristics of a hose arrangement 100 may change, as the internal pressure of the hose arrangement changes. Figure 6 shows an axial cross section of a wall of a hose arrangement, with the first and second conductive layers 102, 104 positioned at distances a and b from the central axis of the hose arrangement, and separated by the elastomeric layer 106. Depending on the pressure it changes, in the hose arrangement, both the first and second layers can be compressed, and they can change their thickness, in different values Δa, Δb, respectively. In addition, as illustrated in figure 7, the thickness of the elastomeric layer 106 can be represented as the difference between the distances b and e (that is, distances from the central axis of the hose to the central axis of each of the conductive layers 102, 104), as adjusted by half the compression distance of the conductive layers:

    [0051] Furthermore, since the resistance and capacitance are proportional to the natural logarithm of the distance proportion (Em (b / a)), the proportional resistance and capacitance can be represented as a function of the thickness of the elastomeric layer:

    [0052] As specifically illustrated in figure 7, because the pressure varies with time t, this will cause a change in X2 (t), which refers to a change in elastomeric thickness over time. This will make the elastomeric thickness (T-X2 (t)) vary. Thus, the amount Ln (b / a) will vary over time, with pressure changes, as follows:

    [0053] As noted, as the pressure increases, the distance X2 decreases, and as a result the thickness (T-X2 (t)) will decrease. In addition, the resistance will decrease by ΔR, and capacitance will increase by ΔC. Specifically, a hose resistance will change as follows:

    [0054] In addition, the change in the thickness of the elastomer will change as follows:

    [0055] Consequently, both the resistance and the capacitance of the hose arrangement will change in response to changes in the internal pressure of the hose. With reference specifically to figure 8, a modified schematic model of the hose arrangement 100 is illustrated, in comparison to the arrangement shown in figure 5. As shown, an additional adjustment of capacitance 145, illustrated as ΔC, and an additional adjustment to resistance (shown as ΔR, as a part of resistor 120) are illustrated.
    [0056] In figure 8, it is noted that the normalization time for the hose arrangement 100 varies according to the specific pressure also present in the hose. Specifically, the normalization time of the voltage drop along the hose will vary according to resistance 120 (Hose):

    [0057] In addition, the resistance of the hose will change over time, depending on the pressure:

    [0058] This leads to a model where a change in the thickness of the elastomeric layer 106 is a function of several hose parameters and stresses detected, as follows:

    [0059] In addition to the aforementioned estimate of change in the thickness of the elastomeric layer 106 as a function of detected stresses, it is then possible to extrapolate a pressure estimate within the hose arrangement 100 based on these same observed stresses. However, due to the elastomeric nature of the insulating elastomer layer 106, the relationship between displacement of the elastomeric layer 106 and the fluid pressure within the hose arrangement 100 are not perfectly correlated, but instead follow a hysteresis model. Now with reference to figure 9, a graph 300 showing a first experimental example of observed hysteresis, illustrates the responsiveness of the elasticity of an insulating layer included in a hose arrangement, according to the configurations of the present disclosure. As illustrated, the example uses the values outlined in Table 1, below, to empirically derive a hysteresis model for the elastomeric layer 106 of the hose arrangement. For example, an exchangeable inlet pressure can be applied to a hose arrangement 100 and the voltage response can be recorded to determine the effect of resistance and the capacitive effect of the hose arrangement. Table 1: Experimental Characteristics of a Hose Arrangement for Hysteresis Model

    [0060] From this pressure measurement and calculation of capacitance as a function of Vmangueíra's response to a switching pressure input, the relationship can be extrapolated from graph 300, as follows:

    [0061] In addition, the compression of the elastomeric layer 106 of the hose arrangement can be represented as a function of the thickness of layer 106 at atmospheric pressure, as adjusted by the hose pressure affected by the constants dictated by the parameters, with respect to the materials used in the hose arrangement:

    [0062] As illustrated in graph 300, as the pressure increases from 0 to 1000 psi, the capacitance increases slowly. However, as the pressure is reduced from 1000 psi to 0 psi, the capacitance decreases slowly, and does not return to the original value immediately, due to the effects of hysteresis.
    [0063] It should be noted that, although in figures 5 and 8 a specific voltage divider circuit is illustrated, where a resistor 120 (Rsensor) is positioned on the high voltage side of the hose arrangement 100, which has a first conductive layer 102 connected to resistor 120 and a second layer 104 connected to earth, in alternative configurations other circuit arrangements may also be used. For example, a circuit can be employed, to which additional components will be included, or in which the voltage divider arrangement is inverted (i.e., resistor 120 is positioned between hose arrangement 100 and earth).
    [0064] With reference to figures 10-12, additional examples of hysteresis are shown. Particularly, in figure 10, an inlet pressure wave 400 is illustrated, where occurrences of periodic high pressure are shown. In particular, the inlet pressure wave 300 illustrates a change from about 0.2 to about 1.2 MPa, or between about 0 and 2000 psi. As shown, the inlet pressure wave includes a low pressure condition 402, an elevating pressure condition 404, a high pressure condition 406, and a declining pressure condition 408.
    [0065] Figure 11 shows a 500 graph of a hose outlet voltage (Vmangueira) compared to pressure over time. In the context of this disclosure, it is assumed that the hose outlet voltage (Vmangueira) is about 4.5 V or above, if the internal pressure of the hose is about 0 psi, as illustrated in region 502 (ie corresponding to response to an inlet pressure region 402). However, as the pressure increases in the hose (that is, in region 404 of figure 10), the tension slowly decreases in region 504. At maximum pressure (in region 406), the tension continues to decrease, in region 506. In the region of declining pressure (such as region 408), tension increases slowly (region 508). As can be seen in figure 11, at the same pressure, different voltage readings can occur, based on a previous pressure, within the hose arrangement. Thus, a graph 600 of hysteresis curves is illustrated in figure 12, which defines a creep model analogous to that described above, in figure 9. The creep model tracks a change in elastomeric compression over time, based on a compression previous, the current pressure P (t), and the constants α and β, which are experimentally determined for each arrangement of materials used to form the hose arrangement 100. Specifically, the change in elastomeric compression can be illustrated as:

    [0066] In this way, a hysteresis model can be applied to any hose model whose reaction is traced and whose hose characteristics are known, to allow computing the current thickness of the elastomeric layer, based on a stress response of the arrangement of hose 100 tracked over time, and subsequent estimation of the internal pressure of the hose arrangement, by applying a hysteresis model to the results of that elastomeric layer thickness computation.
    [0067] Now with reference to figure 13, the flowchart of a method 700 is shown to detect and compute the internal pressure of a hose arrangement, according to an exemplary configuration. The method 700 can be executed, in various configurations, through a microcontroller associated with a hose, or with a computer system communicatively connected to a signal acquisition system associated with a hose arrangement 100. In configurations where a computer system separate from hose arrangement 100 is used, the computer system can be used to manage a model of one or more hoses and provide updates regarding an estimated pressure of each hose, such as abnormal pressures or other issues that may indicate failure or malfunction of the hose that can be detected.
    [0068] In the configuration shown, method 700 includes inputting an electrical signal, from an electrical source, over a conductive layer of a hose arrangement (step 702), and measuring the response of the hose arrangement (step 704 ). This may include, for example, applying voltage across the hose arrangement, using a monitoring circuit such as those shown in figures 5 and 8, and monitoring changes in an output voltage Vmangueira as a function of time. Method 700 can also include the application of a signal processing algorithm to the output voltage Vmangueira to determine the electrical properties of the hose over time, including its resistance and capacitance at each time (R (t) and C (t) ), using, for example, the estimates provided above and discussed with respect to figure 8 (step 706).
    [0069] In the configuration shown, method 700 includes the application of an algorithm based on the resistance and capacitance estimates over time to determine an estimated thickness for the elastomeric layer that is positioned between the conductive layers of the hose arrangement 100 ( step 708). This may include, for example, determining a change in thickness, over time X2 (t), as discussed above in connection with Figure 8, and determining such an effect on the thickness T of the elastomeric layer 106.
    [0070] In some configurations, method 700 also includes the development of a pressure estimate within the hose arrangement 100, based on changing the thickness of the elastomeric layer 106 over time, using a derived hysteresis model as shown above (step 710).
    [0071] Although in figure 13, method 700 discloses the application of an algorithm to determine the wall thickness and a subsequent hysteresis model to determine the internal pressure of the hose arrangement, it should be noted that in alternative configurations models could be used able to calculate the pressure directly, from an electrical response of the hose arrangement and the characteristics of the hose arrangement. In such configurations, considerations about hysteresis and / or hose thickness can be incorporated into the electrical response model of the hose arrangement.
    [0072] Now with reference to figures 14-17, graphs illustrating an exemplary process for executing method 700 of figure 13 are shown, using a variable inlet pressure wave. In figures 14-17, hose lengths of 24 and 60 inches were used. Figure 14 illustrates a graph of an inlet pressure wave, showing periodic changes in the inlet pressure between 0 and 0.6 MPa. In figure 15, a graph 900 illustrates a voltage response in Vmangueira to the pressure change inside the hose, keeping the Vsensor input voltage constant. As can be seen in the periodic response voltage shown, when switching to high pressure, the hose voltage will stop at maximum voltage and then return to a normalized voltage, representative of the direct current voltage, indicating that the capacitive effects of the arrangement hose lines have normalized. In addition, when switching to low pressure, the hose voltage will initially drop, and the voltage will drop further over time, as the capacitive effect of hose arrangement 100 discharges.
    [0073] Figure 16 shows a graph 1000 of the estimated value of X2 (t) based on the observed voltage and known characteristics of the hose arrangement under test. As seen in this graph, the response of X2 (t) is generally inverse to that of the Vmangueira voltage detected over time. Finally, to estimate the pressure, a hysteresis model is applied, and the results of which are illustrated in figure 17. In particular, Figure 17 shows a graph 1100 that illustrates a first waveform 1102 that represents the pressure estimated based on calculations hysteresis and thickness of the elastomeric layer, and a second waveform 1104 illustrating the actual inlet pressure in the hose arrangement. As seen in Graph 1100, the pressure within the hose arrangement can be determined with reasonable precision based on monitoring a voltage response from the conductive layers of the hose, since the resistive and capacitive effects of that hose can be used to determine the distance between the conductive layers. Once the hysteresis in the elastomeric insulating layer between the conductive layers is compensated, the internal pressure of the hose can be extrapolated from mathematical models of the hose. This allows you to continue monitoring the internal pressure of the hose, without requiring expensive equipment and pressure detecting meters.
    [0074] Now with reference to figures 1-17 it is generally noted that although two conductive layers are discussed in the configurations described here, in alternative configurations within the scope of the present disclosure, hose arrangement 100 may include more than two conductive layers . In such arrangements, each of the conductive layers can be separated from the adjacent conductive layers by means of separate insulating layers and the resistive and capacitive characteristics of such a hose arrangement (as well as the hose construction variables) may vary in the same way, within the general concepts, as disclosed herein and as covered in the appended claims.
    [0075] The specifications, examples and data above offer a complete description of the manufacture and use of the composition of the invention. Since many configurations of the invention can be made without departing from the essence and scope of the invention, the invention consists of the claims hereby attached.
    权利要求:
    Claims (13)
    [0001]
    1. Pressure sensitive hose arrangement, characterized by the fact that it comprises: - a hose arrangement (12; 100) including a hose (16) having first and second conductive layers (20, 24; 102, 104) and an elastomeric layer insulator (22, 106) positioned between the first and the second conductive layers (20, 24; 102, 104); - a circuit (14) electrically connected to the first and second conductive layers (20, 24; 102, 104) of the hose arrangement (12; 100), the circuit (14) generating an electrical signal along the first and second conductive layers (20, 24; 102, 104) of the hose arrangement (12; 100), with the hose arrangement (12; 100) generating an electrical response to the electrical signal; - a computing system (14) configured to: - receive the electrical response; - calculate a hose resistance and a hose capacitance based on the electrical response; e - estimate the pressure within the hose arrangement (12; 100) based on the electrical response, and the computing system (14) is configured for; - estimate the pressure inside the hose arrangement by estimating a change in the wall thickness of the hose arrangement (12; 100) based, at least in part, on the hose capacitance and hose resistance; - apply a hysteresis model to the estimated change in wall thickness to estimate the pressure within the hose arrangement (12; 110), the hysteresis model based on a previous elastomeric compression, the pressure, and one or more physical characteristics of the arrangement hose (12; 100); and - produce the estimated pressure based on the applied hysteresis model.
    [0002]
    2. Pressure-sensitive hose arrangement according to claim 1, characterized in that the pressure is a hydraulic pressure within the hose arrangement (12; 100).
    [0003]
    3. Pressure sensitive hose arrangement according to claim 1, characterized in that the computing system (14) is configured to apply an algorithm to estimate a wall thickness of the hose arrangement (12; 100), the computing system (14) being further configured to apply a hysteresis model to estimate the pressure based on the change in wall thickness over time.
    [0004]
    4. Pressure sensitive hose arrangement according to claim 1, characterized in that the first and second conductive layers (20, 24; 102, 104) comprise concentric inner and outer conductive layers.
    [0005]
    5. Pressure sensitive hose arrangement according to claim 1, characterized in that the wall thickness includes a thickness of the insulating elastomeric layer (22; 106).
    [0006]
    6. Pressure sensitive hose arrangement according to claim 5, characterized in that the one or more physical characteristics of the hose arrangement (12; 100) include a hose length (16) and the radii of the first and second conductive layers (20, 24; 102, 104).
    [0007]
    7. Pressure sensitive hose arrangement according to claim 5, characterized in that one or more physical characteristics of the hose arrangement (12; 100) include materials used in the hose arrangement (12; 100).
    [0008]
    8. Pressure sensitive hose arrangement according to claim 1, characterized in that the circuit (14) comprises a monitoring circuit (200) including a voltage source (202) and a scalar resistor (204).
    [0009]
    9. Method of detecting an internal pressure of a hose arrangement, characterized by the fact that it comprises: - applying an electrical signal to a hose arrangement (12; 100); - calculate a hose resistance and a hose capacitance based on a hose arrangement response (12; 100) to the electrical signal; - estimate a pressure within the hose arrangement (12; 100) based, at least in part, on responses, and estimating the pressure within the hose arrangement (12; 100) includes: - estimating a change in thickness wall of the hose arrangement (12; 100) based, at least in part, on the hose capacitance and hose resistance; - apply a hysteresis model to the estimated change in wall thickness to estimate the pressure within the hose arrangement (12; 100), the hysteresis model based on a previous elastomeric compression, the pressure, and one or more physical characteristics of the arrangement hose (12; 100); e- produce the estimated pressure based on the applied hysteresis model; the application of an electrical signal to the hose arrangement (12; 100) comprises the application of a voltage across the first and second conductive layers (20, 24; 102, 104) of the hose arrangement (12; 100) using a monitoring circuit (200).
    [0010]
    10. Method according to claim 9, characterized in that the monitoring circuit (200) includes a voltage source (202) and a scalar resistor (204).
    [0011]
    12. Method, according to claim 9, characterized in that the hysteresis model is empirically determined for a specific group of materials used in the hose arrangement (12; 100).
    [0012]
    13. Method according to claim 9, characterized in that the hysteresis model is related to the responsiveness of a change in the thickness of an elastomeric layer positioned between the first and the second conductive layers (20, 24; 102, 104) of the hose arrangement (12; 100).
    [0013]
    14. Method, according to claim 12, characterized by the fact that the hysteresis model is represented by the following equation: where t and β are constants determined based on a selection of materials used to manufacture the hose arrangement, P (t) represents a current pressure, and X2 (t) represents the elastomeric compression of the hose arrangement.
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    同族专利:
    公开号 | 公开日
    CN103221798B|2017-07-21|
    WO2012071424A2|2012-05-31|
    MX2013005686A|2013-07-22|
    JP5917548B2|2016-05-18|
    CN103221798A|2013-07-24|
    EP2643674B1|2017-11-01|
    CA2818432A1|2012-05-31|
    WO2012071424A3|2012-07-12|
    BR112013012673A2|2016-09-13|
    US20120136592A1|2012-05-31|
    US9677967B2|2017-06-13|
    EP2643674A2|2013-10-02|
    KR101912477B1|2018-10-26|
    JP2013545104A|2013-12-19|
    KR20130117817A|2013-10-28|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-08| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-04-14| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-11-03| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 22/11/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    2021-05-11| B25G| Requested change of headquarter approved|Owner name: EATON CORPORATION (US) |
    2021-06-01| B25A| Requested transfer of rights approved|Owner name: EATON INTELLIGENT POWER LIMITED (IE) |
    优先权:
    申请号 | 申请日 | 专利标题
    US41599110P| true| 2010-11-22|2010-11-22|
    US61/415,991|2010-11-22|
    PCT/US2011/061865|WO2012071424A2|2010-11-22|2011-11-22|Pressure-sensing hose|
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