EP3908990A1 - Method for automatic maintenance of an autonomous vehicle - Google Patents
Method for automatic maintenance of an autonomous vehicleInfo
- Publication number
- EP3908990A1 EP3908990A1 EP20700125.6A EP20700125A EP3908990A1 EP 3908990 A1 EP3908990 A1 EP 3908990A1 EP 20700125 A EP20700125 A EP 20700125A EP 3908990 A1 EP3908990 A1 EP 3908990A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- maintenance
- autonomous vehicle
- identification
- component
- parameters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/20—Administration of product repair or maintenance
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/008—Registering or indicating the working of vehicles communicating information to a remotely located station
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to the maintenance of a vehicle.
- the invention relates more specifically to the automatic maintenance of an autonomous vehicle.
- An autonomous vehicle is equipped with an automatic piloting system which allows it to move in space without human intervention.
- Such vehicles are known and their development is increasing.
- the maintenance of an autonomous vehicle is generally implemented in the same way as for a conventional vehicle, that is to say with human intervention. More specifically, it is the user of an autonomous vehicle who detects a need for vehicle maintenance, and who implements or delegates the implementation of this maintenance to a third party. It is moreover known to carry out this maintenance automatically, for example using an industrial robot.
- One solution would be to operate a fleet of standardized vehicles, the maintenance parameters of which would be identical from one vehicle to another.
- the document US2017 / 139412 proposes a device for monitoring the state of an autonomous vehicle adapted to define an automatic planning of maintenance operations required in order to optimize the maintenance times in slots during which the user has not the use of his vehicle.
- the document D1 devotes long developments to the temporal definition of maintenance operations, it is silent as to means making the performance of maintenance operations more reliable.
- An object of the invention is to facilitate the maintenance of a component of an autonomous vehicle.
- Another object of the invention is to provide maintenance for a fleet of vehicles of different make and / or model.
- a method of automatic maintenance of an autonomous vehicle comprising the steps of: detection of a need for maintenance of a component of the autonomous vehicle, identification autonomous vehicle,
- Such a method it is possible to ensure the maintenance of a plurality of vehicles of different makes and / or models, since the maintenance of a component depends on the identification of the vehicle to which this component belongs.
- such a method can be implemented jointly by an autonomous vehicle and, for example, a docking station.
- an autonomous vehicle is able to ensure its own availability, but also to maintain it in all circumstances. In this way, the availability rate of an autonomous vehicle fleet is improved, and the operating cost of such a fleet is reduced.
- the automatic maintenance method according to the invention can also comprise at least one of the following characteristics, taken alone or in combination:
- the step of detecting a maintenance need includes a step of detecting the wear of a tire of the autonomous vehicle
- the step of determining maintenance parameters comprises a step of determining the dimensions of a wheel and / or a tire of the autonomous vehicle
- the step of detecting a need for maintenance comprises a step of checking the level of charging a battery of the autonomous vehicle
- the step of identifying the autonomous vehicle comprises a step of acquiring an image of the autonomous vehicle, and the component maintenance step includes a step of confirming the need for maintenance of the component.
- an automatic maintenance system for an autonomous vehicle comprising:
- an image capture module configured to acquire an image of the autonomous vehicle
- a recognition server configured to store parameters for identifying the autonomous vehicle as a function of data associated with an image of said autonomous vehicle
- a parameter server configured to store maintenance parameters of the autonomous vehicle component associated with identification parameters of the autonomous vehicle
- a control device configured for:
- the maintenance system being configured to implement an automatic maintenance method as previously described.
- the automatic maintenance system according to the invention can also comprise at least one of the following characteristics, taken alone or in combination:
- the wear sensor is on board the autonomous vehicle
- the maintenance module includes:
- a sensor configured to confirm the wear of the component
- an actuator configured to replace and / or repair and / or update the component.
- a docking station for an autonomous vehicle comprising an automatic maintenance system as previously described.
- an autonomous vehicle comprising a wear sensor and / or a recognition server and / or a parameter server of an automatic maintenance system as previously described.
- FIG. 1 is a flow diagram of steps of an automatic maintenance method according to an embodiment of the invention
- FIG. 2 is a flow diagram of a step for automatically detecting a maintenance need for a component of an autonomous vehicle
- FIG. 3 is a flow diagram of an automatic identification step for an autonomous vehicle
- FIG. 4 is a flow diagram of a step for automatically determining maintenance parameters for a component of an autonomous vehicle as a function of an identification of said autonomous vehicle
- FIG. 5 is a flow diagram of an automatic maintenance step for a component of an autonomous vehicle
- FIG. 6 schematically illustrates an automatic maintenance system according to an embodiment of the invention.
- An autonomous vehicle is able to move without human intervention.
- a vehicle can also be called driverless vehicle, vehicle with delegation of control, unmanned vehicle, automatic vehicle, robot vehicle or intelligent vehicle.
- Such vehicles can be found in the automotive, aeronautical or even nautical fields. If they are able to move without human intervention, such vehicles can nevertheless, from time to time, be driven, or controlled, remotely by through human intervention.
- Autonomous motor vehicles must in particular be able to operate on an open road, in all possible traffic conditions. Given the quantity of autonomous motor vehicles that can be put into circulation, the automatic maintenance of autonomous vehicles in the automotive field is particularly desirable. However, the method E and the automatic maintenance system 1 for an autonomous vehicle 2 described can be applied in other fields, such as the aeronautical field.
- Maintenance generally aims to intervene on all or part of one (or more) component (s) of a vehicle (autonomous or not), in order to ensure its optimal subsequent functioning and, thus, the availability of the vehicle.
- Such maintenance may consist of replacing and / or repairing and / or cleaning all or part of a component, which may be worn or broken, or must be recharged with fluid or energy.
- This component can for example be a vehicle tire or brake pads or a windshield washer reservoir or a bodywork or glazing element, in the case of a motor vehicle, or a battery.
- such maintenance can also consist of updating one (or more) software (s) for operating the vehicle's on-board system.
- Such an update may aim to remedy an obsolescence (preventive maintenance) or to correct and / or prevent the occurrence of an anomaly (corrective maintenance).
- maintenance can consist of improving a library of data useful to the vehicle's on-board system.
- Maintenance generally includes a preliminary step of detecting a maintenance need. This detection step can be implemented during a vehicle diagnostic step or following a maintenance request step. In other words, the detection of a maintenance need can be the result of an unscheduled physical signal signaling a maintenance need, or of a pre-established programmed criterion (eg time since last maintenance, number of kilometers traveled , etc.).
- a maintenance step is implemented (e.g. replacement, repair, update, internal and / or external cleaning of the vehicle, vehicle equipment with aesthetic and / or advertising elements).
- Automatic maintenance is implemented independently of any human intervention, that is to say without a human being taking part in the maintenance.
- the diagnostic and maintenance steps are implemented without direct human intervention (eg visual inspection of the vehicle to implement the diagnostic step) or indirect (eg remote actuation of actuators to activate maintenance).
- the system (s) implementing automatic maintenance act without being controlled (remotely or directly) by a human user, but by implementing a series of pre-established operations, for example according to a logic prerecorded on storage means, such as means readable by a computer.
- automatic maintenance is implemented by a docking station configured to accommodate an autonomous vehicle and perform maintenance on a component of the autonomous vehicle.
- All the steps of the method E of automatic maintenance of an autonomous vehicle 2 described are thus implemented independently of any human intervention. More precisely, each of these steps is carried out by one (or more) physical system (s) (eg the autonomous vehicle 2 itself, or a docking station 3) without a human being piloting or n '' influences the initiation, development and completion. In this way, the autonomy of the autonomous vehicle 2 extends to managing its availability rate, which reduces maintenance costs.
- method E is thus applicable to any type of autonomous vehicle 2 without distinction of model or brand.
- the method E of automatic maintenance of an autonomous vehicle 2 comprises a step E1 of detecting a need for maintenance of a component 4 of the autonomous vehicle 2.
- the step E1 of detecting a need for maintenance is implemented following a request for maintenance E1 1.
- the request for maintenance E11 can be sent by the autonomous vehicle 2 itself, but also by a remote server (not shown) for operating said autonomous vehicle 2.
- a maintenance request E11 can be sent as a function of pre-established criteria. Such criteria correspond for example to a mileage traveled by the autonomous vehicle 2 since a last maintenance, and / or to the intensity of use of the autonomous vehicle 2 (eg average engine speed of the autonomous vehicle 2, average acceleration rate of the autonomous vehicle 2), and / or the environment in which the autonomous vehicle 2 operates (eg outside temperature, surfaces on which the autonomous vehicle 2 travels).
- This maintenance request E11 can in particular specify the component (s) 4 for which maintenance is required, and the maintenance requirement of said component 4, that is to say the extent to which the component 4 must be replaced and / or repaired and / or updated.
- a validation step E12 of the maintenance need of the component 4 targeted by the request E11 can be implemented by detecting the wear E13 of said component 4.
- the wear of the component 4 can be detected by a wear sensor 5 of the said component 4.
- the wear sensor 5 can be installed in the autonomous vehicle 2.
- the wear sensor 5 (or an additional wear sensor) can be external to the autonomous vehicle 2.
- Component 4 is, in a first example illustrated in FIG. 6, a tire 4 of the autonomous vehicle 2.
- a wear sensor 5 of the tire 4 on board within the autonomous vehicle 2 can then comprise diodes arranged in front of a wheel of the autonomous vehicle 2, and configured to detect the optical signal emitted by wear indicators placed on the tire 4.
- a tire wear sensor 5 outside the autonomous vehicle 2 may comprise a module placed on the ground, and comprising a three-dimensional scanner , for example by means of lasers. When the autonomous vehicle 2 is traveling on the module, the scanner measures the depth of the treads of the tire 4 and, from there, detects its wear.
- the component 4 is, in a second example (not shown) which can be complementary to the first example, a battery of the autonomous vehicle 2.
- the battery wear can then correspond to an insufficient level of electrolyte.
- a battery wear sensor 5, on board the autonomous vehicle 2 can be integrated into the battery and measure the electrolyte level.
- Such a measure can also be implemented by a wear sensor 5 external to the autonomous vehicle 2 attached on an ad hoc basis to a battery.
- the wear E13 of a computer component such as embedded software.
- the wear corresponds for example to the obsolescence of a current version of the software.
- This obsolescence can be detected by an on-board system (not shown) of the autonomous vehicle 2, during steps of communication with a remote control server (not shown), or by a control device (not shown) punctually connected to the on-board system. .
- the detection E13 of the wear of the component 4 of the autonomous vehicle 2 can be implemented independently of a maintenance request E1 1 and / or of a confirmation E12 of said maintenance request .
- the step E1 of detecting a need for maintenance is only implemented by detection E13 of the wear of component 4 of the autonomous vehicle 2.
- the detection step E1 of a maintenance requirement may include a step E131 of detecting the wear of a tire of the autonomous vehicle.
- the step E1 of detecting a need for maintenance may include a step of checking E132 of the level of charge of a battery of the autonomous vehicle 2.
- the detection E13 of the wear of the component 4 of the autonomous vehicle 2 makes it possible, in one implementation mode, to determine a time limit for additional control of the component 4.
- the detection E13 of the wear of component 4 makes it possible to provide an optimized time limit for technical control and / or for test and / or additional measurements to be carried out on said component.
- a step of planning a docking station 3 configured to carry out the maintenance of the autonomous vehicle 2 according to the need. in maintenance detected.
- the need for maintenance is linked to a time slot of unavailability of the autonomous vehicle 2.
- the planning of the docking station 3 can then be carried out from said time slot of unavailability and of prices linked to the operation of autonomous vehicle 2 in this niche.
- a centralized server can transmit the time slot of unavailability and the prices linked to the operation both to the autonomous vehicle 2 and / or to an operator managing the operation of a fleet of vehicles to which autonomous vehicle 2 belongs. Said centralized server is then able to manage a docking station planning module 3.
- the method E of automatic maintenance of an autonomous vehicle 2 further comprises an identification step E2 of the autonomous vehicle 2.
- This identification step E2 makes it possible to collect one (or more) parameter (s ) identification of the autonomous vehicle 2.
- Identification parameters may include the make, model, dimensions or license plate of the autonomous vehicle 2. This is not however limiting, since identification parameters of the autonomous vehicle 2 may also include a number of the maintenance contract for the autonomous vehicle 2 authorizing the automatic invoicing of the maintenance service to the entity operating the autonomous vehicle 2.
- the identification step E2 comprises a step of interrogating E21 of the autonomous vehicle 2.
- the autonomous vehicle 2 can respond by issuing identification parameters making it possible to identify it.
- the interrogation of the E21 autonomous vehicle 2 can be implemented by any type of system located on the path from the autonomous vehicle 2 to the docking station 3, and configured to perform active waiting (“Polling” in English terminology) as well as wireless interrogation, for example of the Bluetooth type.
- Such an interrogation system (not shown) can moreover be located within the docking station 3.
- the identification step E2 comprises a step E22 of acquiring an image of the autonomous vehicle 2
- the image of the autonomous vehicle 2 can be acquired by any type of image capture module 6 located on the path of the autonomous vehicle 2 to the docking station 3, and even within the docking station 3, as visible in FIG. 6.
- the acquired image can be a front view, or in profile of the autonomous vehicle 2.
- the acquired image can be a view of a label, such as those of type QR, said label being placed on an external surface of the autonomous vehicle 2.
- the step E22 of acquiring an im age can be implemented by an image capture module 6 such as a wide field camera.
- the step E22 of acquiring an image of the autonomous vehicle 2 can be followed by a step E23 of determining identification parameters of the autonomous vehicle 2 as a function of the data associated with the acquired image.
- This determination E23 can be implemented by a recognition server 7 configured to receive an identification request comprising the data associated with the acquired image.
- This determination E23 can for example be implemented by computer learning mechanisms ("machine learning" in English terminology), such as statistical learning by means of neural network.
- the autonomous vehicle 2 emits identification parameters making it possible to identify it following receipt of a signal, typically a beacon signal, emitted by the docking station 3.
- a signal typically a beacon signal
- a random access memory or “buffer” in English terminology
- the RAM is empty of the identification parameters (eg in "push” mode, in English terminology).
- the method E of automatic maintenance of an autonomous vehicle 2 further comprises a step E3 of determining maintenance parameters of the component 4 as a function of the identification E2 of the autonomous vehicle 2.
- the step E3 of determining maintenance parameters is implemented on the basis of the identification parameters collected at the end of the identification step E2 of the autonomous vehicle 2.
- the maintenance parameters include all of the necessary information when performing maintenance on component 4. These maintenance parameters depend on the identification parameters because this type of information varies from one model or make of autonomous vehicle 2 to another. In this way, the method E of automatic maintenance of an autonomous vehicle 2 can be implemented regardless of the type of autonomous vehicle 2 (ie regardless of its make or model for example).
- the step E3 of determining maintenance parameters comprises a step E31 of determining the dimensions of a wheel and / or of a tire 4 of the autonomous vehicle 2.
- this is not limiting, since it is also possible to determine the number of nuts required for fixing the wheel to the rim, and / or the spacing between the axes of the wheel, and / or the torque (s) required for fastening the wheel, and / or the type of tire 4 recommended according to the identification parameters collected and, for example, data relating to the environment (eg rainy or snowy weather).
- the step E3 of determining maintenance parameters includes a step of interrogating E32 of the autonomous vehicle 2.
- the autonomous vehicle 2 can respond by issuing maintenance parameters for component 4 to be maintained.
- the interrogation E32 of the autonomous vehicle 2 can, for example, be implemented by any type of system located on the path of the autonomous vehicle 2 to a docking station 3, and configured to perform active waiting ("polling" in Anglo-Saxon terminology) as well as wireless interrogation, for example of the Bluetooth type.
- Such an interrogation system (not shown) can moreover be located within the docking station 3.
- the autonomous vehicle 2 transmits maintenance parameters of the component 4 to be maintained, following the reception of a signal, typically a beacon signal, emitted by the station d 'reception 3.
- a signal typically a beacon signal
- a random access memory or “buffer” in English terminology
- the RAM is emptied of the maintenance parameters (eg in "push” mode, in English terminology).
- the method E of automatic maintenance of an autonomous vehicle 2 further comprises a maintenance step E4 of the component 4 as a function of the determined maintenance parameters.
- such maintenance E4 may consist in replacing and / or repairing all or starting from component 4, if it is a physical component of the autonomous vehicle 2.
- a such maintenance can also consist in updating the component 4, if it is for example one (or more) software (s) for operating the on-board system of the autonomous vehicle 2.
- This maintenance step E4 can for example be implemented within a docking station 3.
- a maintenance step E4 can be implemented differently for two autonomous vehicles 2 having nevertheless expressed the same need for maintenance following step E1 to detect a need for maintenance.
- the implementation of the maintenance step E4 can be ordered by the manager of a fleet of autonomous vehicles comprising said two autonomous vehicles 2.
- the maintenance step E4 comprises a step E41 of confirming the need for maintenance of the component 4.
- This step can for example be implemented by detecting the wear E13 of said component 4 of the autonomous vehicle 2 as detailed with reference to the step E1 of detecting a need for maintenance of a component 4 of the autonomous vehicle 2.
- this step E41 is implemented by means distinct from the means for implementing the step E1 of detecting a need for maintenance of a component 4 of the autonomous vehicle 2. This guarantees effective redundancy of the detection E1, E41 of the need for maintenance.
- the means for implementing the confirmation step E41 are generally more precise than the means for implementing the detection step E1, the latter means typically operating on the basis of algorithmic interpretation, the precision of which statistic is weak.
- the replacement E42 and / or the repair E42 and / or the update E42 of the component 4 can be implemented if it has been confirmed that the said component has a need for maintenance. Otherwise, none of these E42 maintenance steps are performed.
- the maintenance step E4 may include a step of real-time acquisition of images of the wheel, for example under different perspectives. Thereafter, the tire 4 can be replaced based on the images acquired. The replacement can then consist of unscrewing, then extracting the nuts. Subsequently, the wheel from which the tire is worn is removed and a wheel with tire 4 new can be installed. Finally, the wheel with new tire 4 is fixed to the autonomous vehicle 2 by means of the nuts.
- a system 1 for automatic maintenance of an autonomous vehicle is configured to implement the method E of automatic maintenance described.
- such a system 1 comprises a wear sensor 5 of a component 4 of the autonomous vehicle 2, an image capture module 6 configured to acquire an image of the autonomous vehicle 2, a recognition server 7 configured to store autonomous vehicle identification parameters 2 as a function of data associated with an image of said autonomous vehicle 2, a parameter server 8 configured to store maintenance parameters of the component 4 of the autonomous vehicle, said maintenance parameters being associated with parameters d identification of the autonomous vehicle 2, a maintenance module 9 of the component 4, and a control device 10.
- the wear sensor 5 can be on board the autonomous vehicle 2, or outside the autonomous vehicle 2.
- the image capture module 6 can be placed on the path of an autonomous vehicle 2 to a docking station 3 for the maintenance of said autonomous vehicle 2.
- the recognition server 7 and the parameters server 8 can also be on board the autonomous vehicle 2 or be external to the autonomous vehicle 2.
- the docking station 3 groups together the wear sensor 5, the image capture module 6, the recognition server 7, and the parameters server 8.
- the maintenance module 9 is generally located within the docking station 3.
- the maintenance module 9 comprises a sensor 91 configured to confirm the wear of component 4 of the autonomous vehicle 2 and an actuator 92 configured to ensure replacement and / or repair and / or update of component 4.
- the actuator 92 comprises a movable arm, and / or a clamp, and / or a screwdriver so as to be configured to put implement maintenance, typically the replacement of a tire 4 according to the particular implementation mode described above.
- the control device 10 is advantageously configured for:
- control device 10 can also be arranged within the docking station 3, as visible in FIG. 6.
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- Engineering & Computer Science (AREA)
- Operations Research (AREA)
- Entrepreneurship & Innovation (AREA)
- Marketing (AREA)
- Economics (AREA)
- Quality & Reliability (AREA)
- Strategic Management (AREA)
- Tourism & Hospitality (AREA)
- General Business, Economics & Management (AREA)
- Theoretical Computer Science (AREA)
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- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1900198A FR3091613B1 (en) | 2019-01-09 | 2019-01-09 | Method for automatic maintenance of an autonomous vehicle |
PCT/EP2020/050429 WO2020144281A1 (en) | 2019-01-09 | 2020-01-09 | Method for automatic maintenance of an autonomous vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3908990A1 true EP3908990A1 (en) | 2021-11-17 |
Family
ID=67514710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20700125.6A Pending EP3908990A1 (en) | 2019-01-09 | 2020-01-09 | Method for automatic maintenance of an autonomous vehicle |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3908990A1 (en) |
FR (1) | FR3091613B1 (en) |
WO (1) | WO2020144281A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022091017A1 (en) * | 2020-10-30 | 2022-05-05 | France Atelier | Integrated diagnostic and maintenance system for vehicles and managing them in a vehicle repair workshop |
FR3115910A1 (en) * | 2020-10-30 | 2022-05-06 | France Atelier | Integrated system for diagnosis and maintenance of vehicles and their management in a vehicle repair shop |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9791861B2 (en) * | 2015-11-12 | 2017-10-17 | International Business Machines Corporation | Autonomously servicing self-driving vehicles |
FR3057371A1 (en) * | 2016-10-11 | 2018-04-13 | Peugeot Citroen Automobiles Sa | METHOD FOR UPDATING A VEHICLE SOFTWARE |
-
2019
- 2019-01-09 FR FR1900198A patent/FR3091613B1/en active Active
-
2020
- 2020-01-09 EP EP20700125.6A patent/EP3908990A1/en active Pending
- 2020-01-09 WO PCT/EP2020/050429 patent/WO2020144281A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR3091613B1 (en) | 2022-03-25 |
FR3091613A1 (en) | 2020-07-10 |
WO2020144281A1 (en) | 2020-07-16 |
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