• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    hose degradation monitoring system and method for monitoring the degradation of a hose set a system and method for detecting the degradation of a hose is revealed. in one aspect, a system for monitoring hose degradation includes a hose assembly including a hose having a first conductive layer and a second conductive layer, and a monitoring circuit in electrical communication with the first and second conductive layers. the degradation of the monitoring circuit includes a circuit element having a non-linear electrical property in response to the altered voltage.
    公开号:BR112013027409B1
    申请号:R112013027409-3
    申请日:2012-04-26
    公开日:2020-10-06
    发明作者:James Joseph Hastreiter
    申请人:Eaton Corporation；
    IPC主号:
    专利说明:

    Historic
    [0001] High pressure reinforced hydraulic hoses are typically used in a variety of hydraulic machines as earth moving machines, to provide a flexible connection between various moving parts of a hydraulic circuit employed in or inside the machine. These hoses may include a hollow polymeric inner tube, in which successive cylindrical layers of reinforcement material, such as wires or textile products, are concentrically applied to withstand the axial and radial pressures developed inside the inner tube.
    [0002] Many applications require hose construction with high resistance to breakage and long-term resistance to fatigue. Using conventional technology, the breaking strength of a hose design can be increased by adding material and / or layers of reinforcement, a practice that is generally discouraged due to its negative impact on hose flexibility, or by the overall increase in resistance to traction of each layer of reinforcement material, which can impair the fatigue resistance of the hose.
    [0003] To determine the robustness of a hose design, the hose manufacturer typically performs, among other tests, an impulse test and a hose burst test. The impulse test measures the design resistance of a hose to fatigue failure, cyclically subjecting the hose to hydraulic pressure. A burst test, on the other hand, is a destructive hydraulic test used to determine the maximum stress of a hose by uniformly increasing the internal pressure until it breaks. Based on these and other tests, the 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 require replacement.
    [0004] In some circumstances, it is desirable to detect, in a non-destructive and non-disruptive manner, a probability of failure of the hydraulic hose. A solution that gives this capability is discussed in U.S. Patent No. 7,555,936, and reveals the connection of a monitor circuit between two parallel and at least partially conductive layers of a hose wall. A change in electrical property observed by this monitor circuit can indicate a change in a property of a hose wall structure that could indicate the impending failure of a hose wall. However, even with this solution, it can be difficult to determine whether the altered electrical property is in fact due to a change in a physical characteristic of a hose wall or, if the altered electrical property is due to a change in the sensor electronics, a change in an electrical property of a harness that connects the monitoring circuit to a hose wall, or the simple degradation of an electrical connection to a hose wall. In such cases, there may be a change in an observed electrical property, even when the integrity of the hose wall is not compromised. summary
    [0005] One aspect of the present disclosure concerns a system for monitoring hose degradation. The system includes a set of hoses including a hose having a first conductive layer and a second conductive layer, and a monitoring circuit in electrical communication with the first and second conductive layer. The degradation monitoring circuit includes a circuit element having a non-linear electrical property in response to altered voltage.
    [0006] A second aspect of the present disclosure concerns a method for monitoring the degradation of a set of hoses. The method includes applying a first voltage to a connected circuit element between the first and second conductive layers of a hose assembly, and concurrently, detecting a first electrical characteristic of the circuit element. The method also includes applying a second voltage to a circuit element, the second voltage different from the first voltage, and concurrently detecting a second electrical characteristic of the circuit element. The method also includes calculating an electrical characteristic of the hose assembly based on at least part of the first and second electrical characteristics.
    [0007] A third aspect of the present disclosure concerns a system for monitoring hose degradation that includes a hose set, a monitoring circuit, and a monitoring set. The hose set includes a first conductive layer and a second conductive layer, and the monitoring circuit includes an electrically connected diode between the first conductive layer and the second conductive layer. The diode has a resistance that changes nonlinearly as a function of the voltage applied to the diode. The monitoring set includes a housing and a circuit board, with a circuit board positioned in a channel of the housing and including electrical contacts oriented to the hose set. The electrical contacts electrically connect the monitoring circuit with the first and second conductive layers. Brief description of the drawings
    [0008] Figure 1 is a partial cross-sectional view of an exemplary set of hoses that employs a fault detector having exemplary characteristics of aspects according to the principles of the present disclosure;
    [0009] Figure 2 is a perspective view, in partial section, illustrating an exemplary hose that employs a braided conductive layer suitable for use with the hose set in Figure 1;
    [0010] Figure 3 is a perspective view, in partial section, illustrating an exemplary hose that employs a conductive layer of spiral wire suitable for use with the hose set of figure 1;
    [0011] Figure 4 is an exploded perspective view of a monitoring set that can be installed in a part of a hose illustrated in figure 1;
    [0012] Figure 5 is an exploded perspective view of a housing forming a part of the monitoring set of figure 4;
    [0013] Figure 6 is a perspective view of a circuit board surrounded by the housing of Figure 5;
    [0014] Figure 7 is a side plan view of a circuit board in Figure 6;
    [0015] Figure 8 is a top plan view of a circuit board in Figure 6;
    [0016] Figure 9 is a schematic view of a circuit board of Figure 6;
    [0017] Figure 10 is a generalized schematic view of a monitoring circuit included in the monitoring set of figures 4-10, integrated with the hose set of figures 1-3;
    [0018] Figure 11 is a logic circuit representation of components of an integrated monitoring set and hose set of figure 10;
    [0019] Figure 12 is a schematic view of a diagnostic unit that can be used in conjunction with the monitoring set of figures 4-9; and
    [0020] Figure 13 is a representation of a method for monitoring the structural integrity of the hose set in Figure 1. Detailed Description
    [0021] Reference will now be made in detail to the exemplary aspects of the present disclosure, which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers will be used in all drawings to indicate the same or similar structure.
    [0022] Now with reference to figure 1, an exemplary hose failure detection system is shown, generally indicated by 10. The system for detecting hose failures 10 includes a hose set, usually indicated by 12, and a monitoring set 14 in electrical and physical communication with the hose set 12.
    [0023] The hose set 12 includes a hose, usually indicated by 16, having a multilayered construction. In the present 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 requirements of the particular application, a first conductive layer 20, an intermediate layer 22, a second conductive layer 24 and an outer cover 26. The first and second conductive layer 20, 24 defines an electrical characteristic of the hose assembly 12, such as resistance.
    [0024] In the present configuration, the first conductive layer 20 overlaps the inner tube 18 and the intermediate layer 22 overlaps the first conductive layer 20.
    [0025] The second conductive layer 24 is superimposed on the intermediate layer 22. The first and second conductive layers 20, 24 can be configured as reinforcement layers. The outer cover 26 can overlap with the second conductive layer 24, and can include, for example, an extruded rubber or plastic layer. The outer cover 26 may itself include a reinforcement layer.
    [0026] The intermediate layer 22 operates to at least partially electrically insulate the first and second conductive layers 20, 24 from each other. The intermediate layer 22 can be of any type of construction. For example, the intermediate layer 22 may consist of a single bed of electrically resistive material. The intermediate layer 22 can also consist of multiple layers, at least one of the layers exhibiting electrical insulating properties. Some composite materials can also be used in the intermediate layer 22, such as a braided fabric bound to a polymeric material. Composite materials having various other constructions can also be used. Composite materials can also be used in combination with other materials to form an intermediate layer 22.
    [0027] The first and second conductive layers 20, 24 generally extend over the entire length and extension of the entire circumference of the hose. This is also usually the case when the conductive layer also functions as a reinforcement layer. The intermediate layer 22 can also extend over the entire length and circumference of the hose. It can occur, however, where at least one of the first and second conductive layers 20, 24 extends only a part of the length of the hose and / or a part of its circumference. In this case, the intermediate layer 22 can also be configured to generally extend through the region of the hose containing the partial conductive layer 20, 24. The intermediate partial layer 22 can be positioned inside the hose, in order to separate the first and second conductive layers 20, 24 to each other.
    [0028] Now with reference to figures 2 and 3, the first and second conductive layers 20, 24 can include, for example, an electrically conductive braided 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 will also be appreciated that other configurations, such as four and six wire arrangements, can also be used.
    [0029] The first and second conductive layers 20, 24 can have the same configuration individually, or each layer can be configured differently. For example, the first and second conductive layers 20, 24 can individually include the braided material shown in Figure 2, or one of the first and second conductive layers 20, 24 can include the braided material while the other between the first and the second. second conductive layers 20, 24 can include the spiral reinforcement material shown in figure 3. In addition, the first and second conductive layers 20, 24 can include a single fold or multiple folds of reinforcement material. The first and second conductive layers 20, 24 can comprise metallic yarns, synthetic or natural fibers and fabrics and other reinforcement materials, provided that the selected material is conductive.
    [0030] Referring again to figure 1, the hose assembly 12 may include a hose adapter, generally indicated by 30, for the fluid coupling of hose 16 to another component. The hose adapter 30 can have any variety of different configurations depending, at least in part, on the requirements of the particular application.
    [0031] In the present configuration, the hose adapter 30 includes a nozzle, usually indicated by 32, which couples the inside of the hose 16 with a socket, usually indicated by 34, which couples the outside of the hose 16. The nozzle 32 includes a elongated cylindrical end part 36 that couples the inner tube 18 of the hose 16. A cylindrical shaped end part 38 of the socket 34 couples the outer cover of the hose 16. The socket 34 and the nozzle 32 can be made of any electrically conductive material .
    [0032] Socket 34 and nozzle 32 can be attached to hose 16 by crimping the end part 38 of socket 34 which overlaps with hose 16. The crimping process deforms the end part 38 of socket 34, thereby compressing the hose 16 between the nozzle 32 and the socket 34. In the present configuration, the parts of the nozzle 32 and socket 34 that couple to the hose 16 include a series of indentations that at least partially integrate into the relatively soft material of the hose when socket 34 it is crimped to help retain hose adapter 30 in hose 16. Indentations can be configured to prevent indentations from penetrating the inner tube and outer shell and making contact with the first and second conductive layers 20, 24.
    [0033] In the present configuration, socket 34 includes a circumferentially protruding handle 40, positioned close to an end 42 of socket 34 adjacent to an end 44 of hose 16. Handle 40 engages in a corresponding circumferential slot 46 formed on the nozzle 32 to fix socket 34 on the nozzle 32. The end 42 of the socket 34 having the handle 40 is initially formed larger than the nozzle 32 to allow the socket 34 to be mounted on the nozzle 32. During the assembly process, the end 42 of socket 34 is crimped, which deforms socket 34 and forces handle 40 in coupling with the corresponding slot 46 in nozzle 32. Socket 34 can be electrically isolated from nozzle 32 by placing an electrically insulating collar 48 between socket 34 and the nozzle 32 at the point where the handle 40 engages the slot 46.
    [0034] A hose adapter 30 also includes a nut 50 rotatably attached to the nozzle 32. The nut 50 provides means for attaching the hose assembly 12 to another component.
    [0035] 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 will be configured to extend beyond the end of the outer cover of the hose 16. The second conductive layer 24 can couple socket 34 to create an electrical connection between socket 34 and the second conductive layer 24.
    [0036] To help prevent the parts of the first and second conductive layers 20, 24 extending beyond the end of the hose 16 from coming into contact with each other, an electrically insulating spacer 52 can be positioned between the exposed ends of the first and of the second conductive layers 20, 24. The spacer 52 can be integrally formed as part of the collar 48 used to electrically insulate the socket 34 from the nozzle 32. The spacer 52 can also be formed by extending the intermediate layer 22 of the hose 16 in addition to an end of the inner tube 18 and the outer cover 26. The spacer 52 can also be configured as a separate individual component of the collar 48 and the intermediate layer 22 of the hose 16.
    [0037] Monitoring set 14 can have any variety of configurations. In general, the monitoring set 14 can be connected to a part of the hose set 12, in particular the part illustrated in figure 1. The monitoring set 14, when installed in the hose set 12, forms an electrical and physical connection with the hose assembly 12, and in particular the nozzle 32 and socket 34, respectively. Generally, the monitoring set 14 detects an electrical characteristic of the hose set 12, while validating the connection with the nozzle 32 and the socket 34. An exemplary monitoring set 14 is described in greater detail below, in connection with figures 4- 11.
    [0038] Now with reference to figures 4-9, other structural details of a monitoring set example 14 are shown that can be installed in a part of the hose set 12. The monitoring set includes a housing 100 and a circuit board 102.
    [0039] In the configuration shown, housing 100 includes first and second cover pieces 104a-b that are formed to be joined to form the generally hollow cylindrical housing 100, which is positioned and sized to enclose an end portion of the hose assembly 12. Housing 100 includes a channel 106 within at least one of the cover pieces 104a-b within which the circuit board can be seated and positioned to couple the hose assembly 12. In certain embodiments, channel 106 has a open end 107, which allows wire terminals to enter housing 100 and connect to circuit board 102.
    [0040] The cover pieces 104a-b include complementary quick-fit connectors 108, 110 positioned in opposite corners that combine 112 of the cover pieces, so that the cover pieces 104a-b can be interconnected so that they can be decoupled. In alternative embodiments, housing 100 may be constructed of one or more cover pieces, and may be constructed to be detachable or sealed around the hose assembly 12. In certain embodiments, cover pieces may be formed of plastic, and they are weather resistant to protect circuit board 100.
    [0041] When the cover pieces 104a-b are joined, the housing 100 forms a generally hexagonal internal surface 113 along an end that is complementary to the nut 50. In addition, a band 114 is formed circumferentially along the housing 100 at end 42 of socket 34. Band 114 prevents the housing from slipping from hose assembly 12 in the direction of nut 50, or down the length of hose 16. Furthermore, because in that configuration nut 50 has a diameter generally smaller than that of hose 16, housing 100 will not slide along the length of hose 16.
    [0042] Referring now specifically to figures 6-9, circuit board 102 includes two pairs of contacts 116a-b, 118a-b, and circuit element 122. In the configuration shown, circuit element 122 is a diode , further details of which are discussed below in connection with figures 10-13. The circuit board 102 is positioned inside the channel 106 of the housing 100, so that a front face (ie, one side of the circuit board including the contacts 116a-b, 118a-b and circuit element 122) of the circuit board are oriented towards the hose assembly 12.
    [0043] In the configuration shown, when positioned inside channel 106, the first pair of contacts 116a-b is positioned individually to connect electrically to the nozzle 32, and the second pair of contacts 118a-b is positioned to connect electrically to the socket 34. Bases for connecting wires 120 are connected to the first and second pair of contacts 116a-b, 11 8a-b, respectively, as well as to a circuit element 122, through the tracks of the circuit board 124, to form the circuit illustrated in figures 10-11, below. Bases for connecting wires 120 can receive welded or electrically connected connections to the wires leading to a diagnostic unit, an example of which is illustrated in figure 12.
    [0044] Figure 10 illustrates a schematic overview of a circuit 200 formed by the set of hoses 12 to monitor its degradation. Circuit 200 includes monitoring circuit 202, which can, in certain configurations, be positioned on circuit board 102 of figures 4 and 6-9. Monitoring circuit 202 includes a circuit element, illustrated as diode 204, connected between socket 34 and nozzle 32, thus connecting the diode between the first and second conductive layers 20, 24 of hose 16. Although in this configuration it is shown a diode, it is recognized that any circuit element could be used if it had a nonlinear electrical property that included a low or no conduction state in response to the altered voltage.
    [0045] In use, the monitoring circuit 202 can be used to detect an electrical property of the hose, for example, a hose resistance. Although this can be tested in another way by applying a voltage directly to the nozzle 32 and socket 34, this arrangement could be subject to false readings, because it would obtain a false signal of failure in the event of a deteriorated connection between the voltage source and the hose assembly 12 occurring on electrical contacts 116a-b, 118a-b. Thus, the use of two or more readings at different voltage levels for conductive and non-conductive states of a circuit element 204 allows verification that open circuit conditions are not the cause of a given reading.
    [0046] In general, it is noted that although circuit 202 is for monitoring an electrical property of the first and second conductive layers 20, 24, other characteristics of the hose set 12 and the monitoring set 14 contribute to the general measurements made by a diagnostic unit. Figure 11 illustrates a schematic representation of the total circuit 200, including the various resistive effects introduced by the hose assembly 12 and the monitoring assembly 14. In this illustration, diode 204 is connected in parallel with the hose assembly 12, which is represented by a hose resistance 206 (RHOSΘ).
    [0047] There are also other resistances in circuit 200, shown in the schematic view of figure 11. These include resistances caused when contacts 116a-b, 118a- b are electrically connected to socket 34 and nozzle 32. These resistances are represented by contact resistors 216, 218 (Rcontacti, Rcontact2, respectively). In addition, the resistances of the wires leading to a diagnostic unit are shown as resistors 220, 222 (Rwirei, Rwire2) r since the monitoring of the circuit response will typically occur in the diagnostic unit.
    [0048] In general, the resistance of the contact and the wires in the hose set and in the monitoring set is assumed to be constant over time and for the conditions in which the hose resistance is calculated. If the voltage / current characteristics of the circuit element (for example, the diode) are known, then the remaining values of the unknown circuit are the resistance of hose 206 (RHOS,), and the total resistance in circuit 200. To obtain these two values, two measurements can be made to obtain readings from which unknown values can be obtained. In certain embodiments, a first measurement occurs when diode 204 is in a conduction state (for example, with a forward bias) and a second measurement occurs when diode 204 is in a non conduction state (for example, with a reverse bias) ).
    [0049] Although in the embodiments discussed here the diode is positioned at one connection end of a hose assembly, it is recognized that the diode and / or contacts could be elsewhere in the hose, as at the opposite end of the hose assembly hoses. In addition, although in the configuration discussed here it is noted that the hose resistances are considered, it could also be considered a capacitive effect of the hose, together with the nominal contamination resistance present due to the noise of the contact set.
    [0050] Now with reference to figure 12, a schematic view of a diagnostic unit 300 is shown. The diagnostic unit 300 can be used, for example, to apply a stimulus to circuit 200 of figures 10-11, and to obtain a characteristic hose assembly 12. Taking repeated measurements of this electrical characteristic, changes over time may indicate degradation of hose 16 within the hose assembly 12.
    [0051] In the configuration shown, the diagnostic unit includes a switching voltage source 302 connected to a first wire 304a of a pair of wires 304a-b by a resistor 306 (Rscaiari). In the configuration shown, the switching voltage source 302 is capable of providing a + 5V or -5V signal on wires 304a-b, selectively applying a 5V source to one of wires 304a-b. However, in other embodiments, the switching voltage source 302 may include other switches and / or voltage levels or voltage dividers. In the example shown, another resistor 312 (RScaiar2) is selectively incorporated into the circuit of the diagnostic unit 300 using a voltage divider switch 311 to provide positive and negative voltages of multiple levels on wires 304a-b.
    [0052] The pair of wires 304a-b leads from the diagnostic unit 300 to the circuit 200, and can, for example, represent an opposite end of the wires that extends to the diagnostic unit illustrated in Figures 10-11. In certain embodiments, wire pair 304a-b leads from a location on the hose assembly 12 to a control panel, such as a panel inside a vehicle cab in which the hose assembly 12 is installed. Other routing arrangements for wire pair 304a-b are also possible.
    [0053] The diagnostic unit 300 also includes a voltage sensor 308 connected to an analysis unit 310. Voltage sensor 308 is connected to wire pair 304a-b, and an output is passed that indicates the current level in the circuit for the analysis unit 310 to perform one or more calculations for determining an electrical characteristic of the hose assembly 12. The analysis unit 310 can take any number of shapes. In certain embodiments, the analysis unit 310 is a programmable circuit configured to execute program instructions. The achievements of the analysis unit 310 can be practiced on various types of electrical circuits comprising discrete electronic elements, packaged or integrated electronic chips containing logic compartments, a circuit using a microprocessor, or a single chip containing the electronic elements or microprocessors. In addition, aspects of the analysis unit 310, such as the calculations discussed herein, can be practiced within a general-purpose computer or by any other circuit or system.
    [0054] In the configuration shown, and using the switching voltage source 302, and / or switching scalar resistors 306, 312 (using voltage divider switch 311), voltage sensor 308, and analysis unit 310, two or more measurements in a circuit, as in circuit 200 in figures 10-11. These measurements can be made using opposite polarity voltages (for example, using switching voltage source 302) or having different voltages of the same polarity (for example , using the voltage divider switch 311 with resistors 306, 312). For example, a first voltage measurement (for example, the output of the voltage sensor 308) can be made with a first voltage having the magnitude and polarity for the forward trend of the diode. The second measurement can be a measurement of the current in the voltage sensor 308 with a voltage magnitude and polarity for reverse diode trend. Typically, the second measurement can simply be a measurement using a negative polarity voltage to that used for the first measurement, for example, using the switching voltage source. Alternatively, if the diode is replaced by another device or circuit having a non-conductive state with a forward voltage level, then a positive polarity voltage can be used for the second measurement. These measurements can be used to obtain an electrical characteristic, for example, a resistance of a circuit 200, from which a resistance of a hose 206 (RHOSΘ) and a contact resistance 210 (Rcontact) can be obtained.
    [0055] In certain configurations where more precise resistances are needed, a third measurement can also be made, which will allow the characteristics of the diode to be better calculated. For example, the Third measurement may be a measurement at a polarity to bend the diode forward, but at a scalar resistance or voltage other than the voltage (for example, using a voltage divider circuit including a 312 switched scalar resistor and a switch voltage divider 311). Further details regarding the particular calculations capable of being performed using the unit of analysis are discussed below in connection with figure 13.
    [0056] Figure 13 is a representation of a method 400 for monitoring the structural integrity of the hose assembly in figure 1. Method 400 illustrates an example method for measuring an electrical characteristic of a hose assembly 12 using a circuit element having a non-linear response to voltage and / or current. In certain embodiments, and in the measurements of the illustrated example discussed herein, method 400 can be used in a circuit having a diode (for example, diode 204) connected to the nozzle 32 and socket 34, thus connecting the diode between the first and the second conductive layers 20, 24.
    [0057] According to the configuration shown, a first electrical signal (for example, voltage or current) can be applied to the circuit element (step 402). In certain embodiments, the first electrical signal can be generated from the switching voltage source 302, and can be configured so that the diode has a reverse trend, for example, an application of approximately - 5 V. A first electrical property of the hose set and monitoring set (for example, the collective circuit shown in figures 10-11) can be determined (step 404) while the first electrical signal is applied. The first electrical property can be, for example, based on an observed voltage, using voltage sensor 308 in figure 12. In the example of circuit 200, above, when the diode has a reverse trend, the observed voltage will allow the observation of a characteristic of the total resistance based on the contact and resistance of the wires, as well as the resistance of the hose 206 (RHOSΘ). This is because the diode approaches an open circuit if the connections are made properly in the hose assembly 12. This first total resistance (RT1) can be represented by the following equation: Rn = Rc + RH
    [0058] A second measurement can be made by applying a second electrical signal to the circuit element (step 406) so that the diode has a forward trend. In this assembly, the electrical property of the hose assembly and the monitoring assembly can again be determined while this second electrical signal is applied (step 408). In the example 200 circuit including diode 204, because the diode has a non-linear relation to the applied voltage, the current will pass through the diode and the diode approaches a closed circuit having some resistance component (RD2) given to the diode the forward diode characteristic (VD2) in the diode current (Js) * The resistance of the diode in this assembly can be represented by the following equation, where IT2 is the total current:

    [0059] The current at diode 204 can be calculated using a current divider equation, with part of the current going through the diode and part going through the hose resistance (RHOSΘ). This current is represented by the equation:

    [0060] Thus, the resistance component (R02) can be expressed as:

    [0061] A second total resistance (RT2) of the circuit will be a combination of the contact resistance with the resistances of the parallel hose and the diode, represented as follows:

    [0062] As the total current (ITI and IT2) through circuit 200 can be calculated by the analysis unit 310 as (voltage 302 minus voltage sensor 308) divided by the scalar resistance 306 and / or 312, the first and second total resistance (RT1 and RT2) can be calculated as a voltage sensor 308 divided by the total current (ITI and IT2> •
    [0063] After determining the electrical characteristics of the total circuit, the analysis unit 310 can calculate an electrical characteristic attributable to the hose set 12 (step 414). In the example above, where two measurements are made, a hose resistance can be determined by subtracting the second total resistance (RT2) (in Which ° diode acted as a resistor in parallel with the hose resistance) From the first total resistance (in that the diode acted as an open circuit), according to the following equation:

    [0064] Solving for hose resistance 206 (Rhose) results in the following equation:

    [0065] The assumed voltage of the diode can be used in the above equation, or to obtain a more accurate calculation of an electrical characteristic of the hose assembly, a new measurement can be made to calculate the forward trend of the diode forward (VD2) . In certain embodiments, a third measurement can be made by applying a third electrical signal to the circuit element (step 410) so that the diode has a forward trend, but at a different voltage from the second measurement in step 406. This can be done, for example, by switching to a higher or lower voltage source, or by including a switch-activated scalar resistor. In this arrangement, the electrical property of the hose set and the monitoring set can be determined again while the third electrical signal is applied (step 412). The total resistance (RT3) is obtained as the total resistance (RT2).

    [0066] In the example of the diode illustrated in figures 10-11, the forward trend voltage of the diode can be different in the second and third measurements (VD2, VD3), for example, due to the different applied voltages. Therefore, instead of assuming that the forward trend voltages are the same at different diode excitation levels (VD2, VD3) it can be assumed that:

    [0067] Where K is the increase in the diode voltage caused by greater excitation of the diode, Is Is the diode's reverse trend saturation current, then the diode equation can be used to determine the following relationship between the diode voltages :
    If less precision is acceptable, K can be approximately as a constant or even equal to 1.

    [0068] This calculated value of VD2 can be used in a hose resistance calculation as follows:

    [0069] Now with reference to the general figure 13, it is recognized that the two or more measurements and related calculations can be made periodically, with the calculated resistance of the hose 206 (RHOSΘ) OR another electrical characteristic of the hose tracked in the analysis unit 310. In these arrangements, changes in the impending calculated failure of the hose, for example, are due to the rupture of one or more layers 18-26 of the hose 16.
    [0070] The detection of high contact resistance (Rc), and also consisting of the resistance of the wire and connector of the monitoring unit and of the contactor resistors, is important for the detection of failures in a hose sensor circuit. Rc can be calculated from any of the following equations:

    [0071] In the above specification, the examples and data provide a complete description of the manufacture and use of the composition of the invention. As many embodiments of the invention can be made without abandoning the spirit and scope of the invention, the invention resides in the claims hereafter attached.
    权利要求:
    Claims (14)
    [0001]
    1. Hose degradation monitoring system, characterized by the fact that it comprises: - a set of hoses (12) including a hose (16) having a first conductive layer (20) and a second conductive layer (24); - a monitoring circuit (14) in electrical communication with the first and second conductive layers (20, 24), the monitoring circuit (14) including a circuit element (122) having a non-linear electrical property in response to voltage changed, the monitoring circuit (14) including a diagnostic unit (300) configured to apply a plurality of different voltages across the circuit element (122), the plurality of different voltages including a first voltage, a second voltage, and a third voltage, and the monitoring circuit (14) is further configured to calculate an electrical characteristic of the hose assembly (12) based on the electrical characteristics of the hose assembly (12) in response to the plurality of different voltages while considering a contact resistance determined based on a response to the nonlinear electrical property of the circuit element (122).
    [0002]
    2. Hose degradation monitoring system, according to claim 1, characterized by the fact that the diagnostic unit (300) is located remotely from the hose set (12).
    [0003]
    3. Hose degradation monitoring system, according to claim 1, characterized by the fact that it also comprises a monitoring set (14) including a housing (100) and a circuit board (102), the circuit board (102 ) positioned in a channel (106) of the housing (100) and including electrical contacts (116a-b, 118a-b) oriented towards the hose assembly (12), the electrical contacts (116a-b, 118a-b) connecting electrically the monitoring circuit (200) with the first and second conductive layers (20, 24).
    [0004]
    4. Hose degradation monitoring system according to claim 1, characterized by the fact that the circuit element (122) includes a diode (204) connected through the first and second conductive layers (20, 24).
    [0005]
    5. Hose degradation monitoring system, according to claim 4, characterized by the fact that the diode (204) has a resistance that changes non-linearly as a function of the voltage applied to the diode.
    [0006]
    6. Hose degradation monitoring system, according to claim 1, characterized by the fact that the monitoring circuit (200) is incorporated in a monitoring set (14) mounted on the hose set (12).
    [0007]
    7. Method for monitoring the degradation of a set of hoses, the method being characterized by the fact that it comprises: - applying a first voltage to a circuit element (122) connected between the first and second conductive layers (20, 24) of a set hoses (12); - detecting a first electrical characteristic of the circuit element (122) while the first voltage is applied; - applying a second voltage to the circuit element (122), the second voltage different from the first voltage; - detecting a second electrical characteristic of the circuit element (122) while the second voltage is applied; - applying a third voltage to the circuit element (122), the third voltage different from the first and second voltages; - detecting a third electrical characteristic of the circuit element (122) while the third voltage is applied; and - calculate an electrical characteristic of the hose assembly (12) based on the first and second electrical characteristics.
    [0008]
    8. Method, according to claim 7, characterized by the fact that calculating the electrical characteristic of the hose set (12) is based on the third electrical characteristic.
    [0009]
    9. Method according to claim 7, characterized in that the second voltage is a voltage opposite to the first voltage.
    [0010]
    10. Method, according to claim 7, characterized by the fact that calculating an electrical characteristic of the hose assembly (12) comprises the calculation of a resistance of the hose assembly (12).
    [0011]
    11. Method, according to claim 10, characterized by the fact that the resistance of the hose set (12) is calculated using the equation: _ D ^> 2 - RT1 “RT2 + ~} 1T2 where RH is the resistance of the hose set (12), RTI is a combination of hose set resistance (12) and a contact resistance, RT2 is a combination of contact resistance with a parallel hose set resistance (12) and a diode resistance (204), VD2 is the second voltage and IT2 is a total current.
    [0012]
    12. Method, according to claim 7, characterized by the fact that it also comprises calculating an electrical characteristic of the circuit (200), where the calculation of an abnormal electrical characteristic of the circuit (200) represents a circuit failure that occurs in the set of monitoring (14).
    [0013]
    13. Method, according to claim 12, characterized by the fact that the calculation of the electrical characteristic of the circuit (200) comprises the calculation of a large contact resistance.
    [0014]
    14. Hose degradation monitoring system, characterized by the fact that it comprises: - a set of hoses (12) including a hose (16) having a first conductive layer (20) and a second conductive layer (24); - a monitoring circuit (14) including a diode (122) electrically connected between the first conductive layer (20) and the second conductive layer (24), the diode (122) having a non-linearly changing resistance as a function of the voltage applied to the diode (122); and - a monitoring assembly including a housing (100) and a circuit board (102), the circuit board (102) positioned in a channel (106) of the housing (100) and including electrical contacts (116a-b, 118a -b) oriented towards the hose set (12), the electrical contacts (116a-b, 118a-b) electrically connecting the monitoring circuit (14) with the first and second conductive layers (20, 24); the monitoring circuit (14) including a diagnostic unit (300) configured to apply a plurality of different voltages across the diode (122), the plurality of different voltages including a first voltage, a second voltage, and a third voltage, and the monitoring circuit (14) is further configured to calculate an electrical characteristic of the hose assembly (12) based on the electrical characteristics of the hose assembly (12) in response to the plurality of different voltages while considering a resistance of the contacts determined based on a response to the non-linear resistance of the diode (122).
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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]|
    2019-11-26| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-05-12| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-06| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/04/2012, 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
    US201161480924P| true| 2011-04-29|2011-04-29|
    US61/480,924|2011-04-29|
    PCT/US2012/035216|WO2012149161A1|2011-04-29|2012-04-26|Degradation monitoring system for hose assembly|
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