• 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:
    A hydraulic transmission which finds particular applicability in a wind turbine generator has a pump (4) for connection to a rotor of the turbine for generating pressurised fluid, a motor (8) driven by pressurised fluid for connection to a electricity-generating device, a hydraulic fluid conveyor (6) between pump and motor; and a condition monitoring system comprising a number of sensors (34) disposed in one or both of the pump and motor, connected to a condition processor (36) configured to process the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified.
    公开号:DK201270160A
    申请号:DKP201270160
    申请日:2012-03-30
    公开日:2012-10-01
    发明作者:Nielsen Christian Mark；Thomsen Jakob Kampp
    申请人:Vestas Wind Sys As；
    IPC主号:
    专利说明:

    Hydraulic transmission
    The present invention relates to a hydraulic transmission for use in particular, although not exclusively, as a wind turbine transmission.
    Background of the Invention
    In a wind turbine generator the rotor is driven to rotate by the wind, in a turbine of commercial megawatt scale typically turning at something like 6 to 25 rpm depending on wind speed and turbine design. The rotor includes a shaft which is connected to the generator at which rotary motion is converted to electrical power. The generator is required to output power at grid frequency 50 or 60Hz. The conventional connection between rotor and generator comprises a gearbox to convert the shaft rotation to the generator-required 1500 or 1800 rpm. Although other forms of transmission and electrical power generation involving direct drive solutions are gaining popularity, gearboxes are still by far the most commonly used means of power transmission and able to deliver extremely high efficiencies of power transmission over a long lifetime.
    However, while a gearbox can effect a high efficiency of power transfer, other forms of transmission are possible, and it has been proposed to employ hydraulic transmissions. In such a system the prime mover, here the wind driven rotor, drives a pump at which the pressure of a fluid is raised, this pressurized fluid in turn driving a motor which is in turn connected to the load, here a generator. The use of a hydraulic transmission has numerous potential benefits including the ability to provide a continuously variable transmission, the ability to effectively de-couple rotor and generator which has benefits when particular transient events occur, for example wind events, gusts, lulls at the rotor side, grid outages or low voltage events. Such a transmission also has potential benefits of size and weight, which become more significant as turbines become larger and larger.
    Wind turbines are necessarily required to operate over an extended period of time, often in challenging environments and with minimal servicing, and to have a high degree of reliability, and this presents a challenge for any kind of transmission.
    The present invention seeks to provide a hydraulic transmission provided with a system capable of detecting structural abnormalities or defects in primary system components.
    Summary of the Invention
    In a first aspect, the invention provides a hydraulic transmission for a wind turbine generator comprising: a pump for connection to a rotor of the turbine for generating pressurized fluid; a motor driven by pressurized fluid for connection to an electricity-generating device; a hydraulic fluid conveying system between pump and motor; and a condition monitoring system comprising at least one sensor disposed in one or both of the pump and motor connected to a condition processor configured to process the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified.
    The pump is preferably a radial piston type having working cylinders defined in a cylinder block with respective pistons driven by a rotating cam surface. A plurality of sensors are preferably distributed across the pump and / or motor connected to the processor. The sensors may be disposed within or on the cylinder block or other casing structure.
    The sensors may take a variety of forms sensing various parameters of the components related to structural or operational health. In a particularly preferred form the sensors are ultrasonic sensors providing ultrasonic images of portions of the pump or motor such as the cam surface, and / or roller structures or other components associated with the pistons which move over the cam surfaces.
    In another form the sensors are optical sensors arranged to provide an optical image of the cam surface and / or rollers or other piston structures which move over the cam surface. These may include borescopes, for example of flexible type. The system may be arranged to monitor the correct relative movement of components, for example to monitor the rolling of rollers over the cam surface, to this end the rollers being provided with surface markings to facilitate detection of roller motion, such as regularly spaced gradations arranged around the circumference of the rollers.
    In a still alternative form the sensors are acoustic sensors, whereby an acoustic signature is detected. This may be compared to a stored acoustic signature.
    In still alternative forms the sensors are vibration sensors, or pressure sensors.
    The condition processor may be configured to compare the processed image or signature with an image or signature indicative of a healthy transmission structure or operation, and to output an abnormality-indicating signal in the event of a deviation from this healthy image or signature. This image or signature indicative of a healthy transmission structure is preferably stored in an electronic data store.
    Where the hydraulic transmission further comprises a pumping controller for control of the operation of individual cylinders within the pump, and where sensors are disposed to monitor cylinder health the condition monitoring system may be configured to process the sensor input and determine if a condition abnormality relates to a defective cylinder, and if so to output a disable signal to the pumping controller in order to disable that faulty cylinder. In this way the transmission is able to continue operation, hopefully until a service visit can be arranged.
    Alternatively or additionally, the condition monitoring system may be configured to process the sensor input and determine if a condition abnormality relates to a defective region of cam surface, and if so to output a disable signal to the pumping controller in order to sequentially disable individual cylinders. shortly in advance of arrival of the defective region of cam surface, and to sequentially re-enable after passage of the faulty cam region. In this way the transmission is able to continue operation, hopefully until a service visit can be arranged.
    In a further aspect, the invention resides in a method of operating a hydraulic transmission having a pump for connection to a prime mover for generating pressurized fluid, a motor driven by pressurized fluid and a hydraulic fluid conveying system between pump and motor; and a condition monitoring system comprising at least one sensor disposed in one or both of the pump and motor, connected to a condition processor, the method comprising the steps of providing the sensor output to the processor, processing the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified.
    The method is preferably operated by effecting a machine comparison of the processed image or signature with an image or signature indicative of a healthy transmission structure, the system outputting an abnormality-indicating signal in the event of a deviation from this healthy image or signature. The image or signature indicative of a healthy structure / operation is stored in a data store.
    Where the transmission further comprises a pumping controller for control of the operation of individual cylinders, the method may include processing the sensor output to determine if a condition abnormality relates to a defective cylinder operation, and if so outputting a disable signal to the pumping controller in order to disable the faulty cylinder. The method may further involve processing the sensor output to determine if a condition abnormality relates to a defective region of cam surface, and if so outputting a disable signal to the pumping controller in order to sequentially disable individual cylinders shortly in advance of arrival of the defective region of cam.
    In this manner it is possible for the transmission to continue to operate despite the detected abnormalities, allowing time for a service visit to be arranged.
    In a further aspect, the invention resides in a condition monitoring system for use in a hydraulic transmission having a pump, a motor and a hydraulic conveyance system therebetween, the system comprising at least one sensor disposed in one or both of the pump and motor, connected to a condition processor configured to process the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified
    Brief Description of the Drawings
    Embodiments of the invention are now described, by way of example only, with reference to the following drawings in which:
    Figure 1 is a schematic view of a hydraulic transmission system incorporated into a wind turbine generator;
    Figure 2 is a schematic side view of portion of a pump module of the hydraulic transmission incorporating a condition monitoring system according to an embodiment of the invention;
    Figure 3 illustrates the progression of piston position in the pump module as the pump shaft rotates;
    Figure 4 is an enlarged view of a portion of a pump cam profile and piston showing a sensor position; spirit
    Figure 5 is a schematic side view of part of a motor module of the hydraulic transmission incorporating a condition monitoring system.
    Detailed description of the preferred embodiments
    Figure 1 shows a schematic view of a hydraulic transmission incorporated into a wind turbine, according to one embodiment of the invention. The primary components include a rotor 2 driven by the wind, a hydraulic pump 4, a hydraulic fluid conveyance system 6, a hydraulic motor 8, and a generator 10. The rotor 2, when driven by the wind, converts wind power into rotational, mechanical power provided to the pump 4 through a drive shaft 12. The drive shaft 12 transmits drive torque to the hydraulic pump 4 to produce a pressurized flow of hydraulic fluid to the hydraulic conveyance system 6. In the embodiment of FIG. 1, the hydraulic conveyance system 6 includes a high pressure circuit 14 to deliver a pressurized flow of hydraulic fluid from the hydraulic pump 4 to the hydraulic motor 8 and a low pressure circuit 16 for the return of low pressure hydraulic fluid from the motor 8 to the pump 4. The motor 8, driven by the flow of pressurized hydraulic fluid, drives electrical generator 10, and / or any other components of an electrical system, which provides electrical power as output from the wind turbine.
    Also illustrated as part of the hydraulic fluid conveyance system 6 is zero pressure circuit 7 which supplies fluid to / from the low pressure circuit 16. The system further includes high, low and zero pressure accumulators 9, 11 and 13 respectively, as well as various filtering and valve components associated with the fluid conveyance system 6.
    As illustrated in Figure 2, in the preferred configuration the pump 4 is a radial-type variable displacement pump driven by a ring cam fixed to the drive shaft 12. More particularly the pump includes a plurality of working cylinders 17 denoted cylinders 1 to x disposed spaced at regular intervals in an annular cylinder block 19. Within the cylinders, there are arranged respective pistons 18 disposed to slide in a reciprocating manner within cylinders 17. As can be seen, the cylinder axes are slightly inclined to the radial direction, the precise degree of inclination being such as to reduce lateral loading on the cylinders. Disposed within the cylinder block 19 is a ring cam 20 which defines an undulating cam surface on the outer surface of the drive shaft 12, for example it may comprise a separate ring part fitted onto the exterior of the drive shaft. Alternatively, the undulating profile may be machined or otherwise formed into the shaft 12. The cam surface has the general form of a sine wave with a series of cam lobes 22 defining alternating peaks and valleys. Each piston 18 has a main body 24 provided at its radially inner end with a cam roller 26 which is constrained within a roller seat 28 in a manner whereby it rolls over the cam surface 22 as the drive shaft 12 and cam surface rotate, driving the pistons 18 to reciprocate within the working cylinders 17. Although not illustrated, as is conventional, each working cylinder has an outlet valve wherein pressurized fluid is pushed into the high pressure line in a pumping portion of the cylinder stroke, and an intake valve through which fluid is drawn from the low pressure line on the intake portion of the stroke.
    Figure 3 illustrates the progression of piston position for four of the cylinders numbered 1 to 4, and it will be appreciated that the succeeding cylinders 5 to x will exhibit the same reciprocating movement displaced in time according to the cylinder position.
    The pump 4 is of a switchable variable displacement type whereby it is possible to switch individual cylinders between a pumping mode and an idling mode. This is achieved through the action of electronically activatable valves during operation of a controller 30. Depending on the nature of the valves and how they are operated the electronic control may act directly on the valves themselves, for example if electromagnetically actuated the cylinder switching may act directly on the valve drive. Alternatively, if the valves are arranged to be passively operated, the switching may be effected by control of fluid pressure with additional electronically controlled valving in fluid lines connected to the high and low pressure valves. The ability to switch individual cylinders allows progressive control of fluid displacement from a situation of zero working cylinders to a situation of all cylinders in a pumping mode, thereby allowing continuous stepwise variation of transmission. It may also be arranged that cylinders are arranged to operate in a mode in which less than the full cylinder volume is utilized in a pumping cycle, which is a part-pumpimg mode.
    Within a pumping cycle the pressure of fluid within the working cylinders is increased from the pressure of the low pressure line in the region of a few bar, typically 5 bar, to a working pressure typically set in the region of 250-350 bar. This working cycle involves the exertion of significant forces on the components of the pump, particularly as a piston nears the end of its pumping cycle as the piston approaches top dead center position, which is as the roller approaches the peak of a cam lobe. The cumulative effect of these loads over the pump lifetime creates significant fatigue loads. This is particularly the case for the mutually contacting components where there is relative movement, i.e. the cam lobes 22, and the cam roller 26, and the roller seat 28 and cam roller 26. The components are liable to various abnormalities or localized failures, such as the formation of burrs or edges which might lead to the formation of metallic flakes into the hydraulic fluid, with potentially serious consequences particularly for the integrity and operation of valves, or the formation of micro-cracks or other surface abnormalities which if left untreated might lead to a catastrophic failure of the transmission itself.
    According to an aspect of the invention, a system is provided for monitoring the condition of the operating components within the pump, and for taking a specified action in the event of detection of an abnormality.
    In accordance with one embodiment, the monitoring system comprises at least one, and more preferably a plurality of sensors 34 arranged within the pump, connected to a condition processor 36 which receives and processes the sensor signals. These sense a parameter of the pump component that reflects or is affected by the above-mentioned surface irregularities or abnormalities. In one preferred form the sensors are ultrasonic sensors. Ultrasonic images have the advantage of being able to reveal small defects that may not be visually perceptible, allowing early and possibly less dramatic remedial action to be effected. As shown in Figures 2 and 4, one preferred position for such a sensor is within the cylinder block 16 directed at the cam surface, in order to image this surface. Alternatively or additionally, in a further preferred position such a sensor may be arranged to image the cam roller 26. The ultrasonic signals are received from the sensors and processed within condition processor 36 which creates a detected condition image or signature. The processor is able to compare this detected to condition signature and compare it with a predefined or pre-stored ultrasonic image or signature of a healthy component. The processor 36 may then raise an abnormality signal in a situation where there is a deviation from the healthy image, or a deviation which exceeds a predefined degree. The processor is preferably able to discern the exact location of the abnormality and incorporate this information into the abnormality signal, for example, at cylinder number 3 or cam lobe number 50. In the event of detection of an abnormality, the processor 36 may raise a warning or alarm to the turbine owner or operator, such that a service visit can then be arranged, or the processor may be arranged to take other remedial action, such as shutting down the turbine or altering the pump's operation to a load-alleviating fashion, as is discussed further below. In a further alternative the processor may not make a complete comparison of an image or signature but may examine the detected image or signature for features indicative of an abnormality, for example a change in density of an image or part of an image or the presence of a high density region.
    In an alternative form the monitoring system uses optical type sensors which are connected to the processor 36 via fiber optic links. The system may be provided with separate light sources which illuminate the imaged surface or surfaces. Alternatively, such illumination may be incorporated into the sensors, for example the sensors may take the form of conventional borescopes. The system is provided with an image-processing ability whereby visual discrepancies from an expected healthy image trigger an abnormality-indicating signal and / or other remedial events as described below.
    In one form of optical-based system the rollers 26 are provided with visual markers such as regularly spaced gradations which are imaged by the sensors. The processor is configured to detect the motion of the rollers in order to verify that they are correctly exhibiting a rolling motion, and are not undergoing sliding, and to output an abnormality-indicating signal in the event of detection of sliding.
    The above techniques directly "image" the state or condition of operational components in order to detect structural abnormalities. However, it may be arranged that the operational state is detected, for example correct valve operation, or piston movement. This may be done using one of the techniques described above, but may also be done indirectly through detection of an operating transmission parameter. Thus, in one form the monitoring system uses acoustic sensors. During normal operation, the various oscillations of components within the pump produce a defined acoustic signature or series of signatures. The sensors here detect the acoustic signature and provide this to the processor 36, comparing this to a predefined signature or series of signatures for a healthy pump. In the event of a departure from this healthy signature, which may be due to a structural abnormality of the type described above, or may be due to an operational abnormality, for example a valve receiving incorrect control signals, the processor outputs an abnormality-indicating signal, and / or triggers other events as described below.
    In a further alternative form the monitoring system uses vibration sensors. During normal operation, the various oscillations of components within the pump produce a particular vibrational signature or series of signatures.
    Within the monitoring system, the sensors detect the vibrational signature and provide it to the processor, comparing it to a predefined signature or series of signatures for a healthy pump. In the event of a departure from this healthy signature, which may be due to a structural abnormality or to an operational abnormality, the processor outputs an abnormality-indicating signal, and / or triggers other events as described below.
    In a still alternative form the monitoring system may use pressure sensors, such as having particular applicability in detecting abnormalities which affect the cyclic changes in pressure during pumping cycles, such as improper piston driving or improper valve closing.
    As a further alternative to a fully automated system, the system may visually display the signature or image of the detected parameter to a user who is able to make a manual inspection or comparison, and to manually raise an alarm in the event of detection of an abnormality. In this case the manual inspection may form part of a limited-duration condition monitoring routine, for example conducted as part of a regular service.
    The ability to switch individual cylinders to an idle condition can be utilized to allow the transmission to continue to function but in a reduced operational capacity, despite the detection of damage to an operational component. In the event of detection of a damaged cylinder, the condition processor 36 can communicate with cylinder controller 30 to disable activation of this particular cylinder, but allowing continued operation of the pump, for example until a service visit can be arranged. This mode may require additional control of the functioning of healthy cylinders for optimal power transmission, for example a small number of healthy cylinders at specified locations might be disabled to ensure load-balanced operation or to minimize vibrational consequences.
    If the condition monitoring system detects a damaged region of cam surface such as a damaged cam lobe, the processor 36 can communicate this to the cylinder controller 30 which enacts an operational mode in which, as this region of cam lobe approaches a particular cylinder, that cylinder is disabled in advance of its meeting the damaged cam lobe. Thus, the cylinders are successively disabled just upstream of the damaged cam lobe, and reactivated shortly downstream of this cam lobe. This control strategy allows continued functioning of pump until such time as a service visit can be arranged. If cylinder control is utilized allowing part-pumping it may alternatively be arranged that instead of fully disabling a cylinder, it is arranged to effect a part pump, since part pumping will generally exhibit a reduced loading as compared to a full pump.
    The condition monitoring system is equally applicable to the motor 8. Figure 5 illustrates in schematic section the hydraulic motor 8. In one form this comprises a series of working cylinders 40 defined within tubular sleeve elements 42 fitted within a motor block or casing 44, spaced around the block. Within each cylinder-defining sleeve element 42, a piston 46 is slidably arranged at the working pressure within the cylinders. A radially inner end of each piston bears on the cam surface of output shaft, the cam surface (not shown) having an eccentric shape. Each piston 46 is biased against the cam surface by a spring 48. Although not illustrated, as is conventional, each cylinder has an inlet valve whereby pressurized fluid from the high pressure line is received in a motoring portion of the stroke, and an outlet valve releasing fluid into the low pressure line to return to the pump. As with the pump cylinders, it is possible to selectively disable cylinders through electronic control of the valves, or control of additional valving provided within the high or low pressure lines. Cylinder controller is indicated 50 schematically showing the connection of controller and cylinders.
    The condition monitoring system likewise includes one, or more preferably, a number of sensors 52 distributed within the engine. These are arranged to provide signals representing a sensed parameter to a condition processor 54. As discussed above, these may be ultrasonic, optical, acoustic vibration or pressure sensors, the processor making a comparison of detected image or signature with a predefined image or signature for a healthy motor, or otherwise processing the image or signature to establish component health in the manner discussed above for the pump.
    As discussed above in connection with the pump it may also be arranged that in the event of an abnormality in a cylinder, the cylinder controller 50 may disable that cylinder.
    Although the system is described in the context of direct monitoring it will be appreciated that the sensors may communicate via a communication link with a monitoring system arranged remotely.
    It will be appreciated that the system configuration can be implemented in numerous ways. For example, embodiments may be implemented using hardware, software or a combination thereof. When implemented in software, the software code can be executed on any suitable processor or collection of processors, whether provided in a single computer or distributed among multiple computers.
    The processors may be individual dedicated processors, or may be combined, or may be part of a larger controlling computer system or systems. The processors and controllers can be implemented in numerous ways, such as with dedicated hardware, or with general purpose hardware (e.g., one or more processors) programmed using microcode or software to perform the functions recited above. In this respect, it should be appreciated that one implementation of any of the embodiments described herein comprises at least one computer-readable medium (e.g., a computer memory, a floppy disk, a compact disk, a tape, etc.) encoded with a computer program (ie, a plurality of instructions), which, when executed on a processor, performs the above-discussed functions of the embodiments of the present invention. The computer-readable medium can be transportable such that the program stored thereon can be loaded onto any computer environment resource to implement the aspects of the present invention discussed herein. In addition, it should be appreciated that the reference to a computer program which, when executed, performs the above discussed functions is not limited to an application program running on a host computer. Rather, the term computer program is used herein in a generic sense to refer to any type of computer code (e.g., software or microcode) that can be employed to program a processor to implement the above discussed aspects of the present invention. It should be appreciated that in accordance with several embodiments described herein processes are implemented in a computer readable medium, the computer implemented processes may, during the course of their execution, receive input manually (e.g., from a user). The phraseology and terminology used herein is for the purpose of description and should not be considered limiting.
    The use of "including", "comprising", "having," containing "," involving ", and variations thereof, is meant to encompass the items listed thereafter and additional items. Having described several embodiments of the invention in detail, various modifications and modifications will readily occur to those skilled in the art. Such modifications and improvements are intended to be within the scope of the invention. Accordingly, the foregoing description is by way of example only, and is not intended as limiting. ) are limited only as defined by the following claims and the equivalents thereto.It should be understood that aspects of the invention are described herein with reference to the figures, which show illustrative embodiments in accordance with aspects of the invention. are not necessarily intended to show all aspects of the invention, but rather are used to describe a few illustrative embodiments. TS of the invention are described above with reference to a horizontal axis wind turbine, aspects of the invention may be used with any type of wind turbine, including vertical axis wind turbines, Darius wind turbines, Savonious wind turbines, and the like. Thus, aspects of the invention are not intended to be construed narrowly in view of the illustrative embodiments. In addition, it should be understood that aspects of the invention may be used alone or in any suitable combination with other aspects of the invention.
    权利要求:
    Claims (24)
    [1] 1. A hydraulic transmission for a wind turbine generator comprising: a pump for connection to a rotor of the turbine for generating pressurised fluid; a motor driven by pressurised fluid for connection to a electricitygenerating device; a hydraulic fluid conveying system between pump and motor; and a condition monitoring system comprising at least one sensor disposed in one or both of the pump and motor, connected to a condition processor configured to process the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified.
    [2] 2. A hydraulic transmission according to claim 1 comprising a plurality of sensors distributed over the pump and/or motor connected to the processor.
    [3] 3. A hydraulic transmission according to claim 1 or 2 wherein the pump is a radial piston type having working cylinders defined in a cylinder block with respective pistons driven by a rotating cam surface, the sensors being disposed within or on the cylinder block.
    [4] 4. A hydraulic transmission according to any preceding claim wherein the sensors are ultrasonic sensors providing an ultrasonic image of portions of the pump or motor.
    [5] 5. A hydraulic transmission according to claim 3 wherein the sensors are ultrasonic sensors disposed to image the cam surface.
    [6] 6. A hydraulic transmission according to claim 3 wherein the pistons within the pump are provided with respective rollers which move over the cam surface, and wherein the sensors are ultrasonic sensors disposed to image the rollers.
    [7] 7. A hydraulic transmission according to claim 3 wherein the sensors are optical sensors arranged to provide an optical image of the cam surface.
    [8] 8. A hydraulic transmission according to claim 3 wherein the pistons within the pump are provided with respective rollers which move over the cam surface, and wherein the sensors are optical sensors disposed to image the rollers.
    [9] 9. A hydraulic transmission according to claim 9 wherein the rollers are provided with surface markings to facilitate detection of roller motion.
    [10] 10. A hydraulic transmission according to any one of claims 1 to 3 wherein the sensors are acoustic sensors.
    [11] 11. A hydraulic transmission according to any one of claims 1 to 3 wherein the sensors are vibration sensors.
    [12] 12. A hydraulic transmission according to any preceding claim wherein the condition processor is configured to compare the processed image or signature with an image or signature indicative of a healthy transmission structure, and to output an abnormality-indicating signal in the event of a deviation from this healthy image or signature.
    [13] 13. A hydraulic transmission according to claim 12 wherein the image or signature indicative of a healthy transmission structure or operation is stored in a data store.
    [14] 14. A hydraulic transmission according to any preceding claim further comprising a pumping controller for control of the operation of individual cylinders, wherein the condition monitoring system is configured to process the sensor output and to determine if a condition abnormality relates to a defective cylinder operation, and if so to output a disable signal to the pumping controller in order to disable the faulty cylinder.
    [15] 15. A hydraulic transmission according to any preceding claim further comprising a pumping controller for control of the operation of individual cylinders, wherein the condition monitoring system is configured to process the sensor output and to determine if a condition abnormality relates to a defective region of cam surface, and if so to output a disable signal to the pumping controller in order to sequentially disable individual cylinders shortly in advance of arrival of the defective region of cam surface, and to sequentially re-enable after passage of the faulty cam region.
    [16] 16. A method of operating a hydraulic transmission having a pump for connection to a prime mover for generating pressurised fluid, a motor driven by pressurised fluid and a hydraulic fluid conveying system between pump and motor; and a condition monitoring system comprising at least one sensor disposed in one or both of the pump and motor, connected to a condition processor, the method comprising the steps of providing the sensor output to the processor, processing the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified.
    [17] 17. A method according to claim 16 wherein the processed image or signature is compared with an image or signature indicative of a healthy transmission, the system outputting an abnormality-indicating signal in the event of a deviation from this healthy image or signature.
    [18] 18. A method according to claim 17 wherein the image or signature indicative of a healthy structure is stored in a data store.
    [19] 19. A method according to any one of claims 16 to 18 wherein the sensors are ultrasonic sensors.
    [20] 20. A method according to any one of claims 16 to 19 wherein the sensors are optical sensors arranged to image portions of the pump or motor.
    [21] 21. A method according to claim 20 wherein the optical sensors are arranged to image rollers within a pump in order to monitor their rolling movement.
    [22] 22. A method according to any one of claims 16 to 21 wherein the transmission further comprises a pumping controller for control of the operation of individual cylinders, the method comprising processing the sensor output to determine if a condition abnormality relates to a defective cylinder operation, and if so outputting a disable signal to the pumping controller in order to disable the faulty cylinder.
    [23] 23. A method according to any one of claims 16 to 22 wherein the transmission further comprises a pumping controller for control of the operation of individual cylinders, the method comprising processing the sensor output to determine if a condition abnormality relates to a defective region of cam surface, and if so outputting a disable signal to the pumping controller in order to sequentially disable individual cylinders shortly in advance of arrival of the defective region of cam surface, and to sequentially re-enable after passage of the faulty cam region.
    [24] 24. A condition monitoring system for use in a hydraulic transmission having a pump, a motor and a hydraulic conveyance system therebetween, the system comprising at least one sensor disposed in one or both of the pump and motor, connected to a condition processor configured to process the sensor output to provide a processed image or signature from which structural or operational abnormalities can be identified
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2014-10-20| PHB| Application deemed withdrawn due to non-payment or other reasons|Effective date: 20140331 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161469888P| true| 2011-03-31|2011-03-31|
    US201161469888|2011-03-31|
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