A METHOD AND ARRANGEMENT FOR AUTOMATICALLY REFUELLING AUTOMOTIVE VEHICLES

Abstract: A method for opening and closing a cover-plate on an automotive vehicle, wherein the plate lies in line with the vehicle chassis and can be swung between an open and a closed position about a vertical or horizontal axle and covers the space in which the mouth of the vehicle refuelling pipe is located. The invention is characterized in that the cover-plate (1) is opened in two stages, wherein the plate is opened slightly to a limited open position by means of a first opening device (10) in a first opening stage, thereby enabling a second opening device (11) to be inserted between the cover-plate and the chassis (12), and wherein the plate (1) is opened completely by means of the second opening device (11) in a second opening stage; and is further characterized in that the cover-plate is swung from its open to its closed position by means of the second opening device. The invention also relates to an arrangement for carrying out the method.

Description: A method and arrangement for automatically refuelling automotive vehicles The present invention relates to an arrangement for automatically refuelling cars or other autcanotive vehicles. An arrangement for automatically refuelling cars is described in Swedish Patent Specification No (Swedish Patent Application 8901674-5) . This known arrangement comprises a robot which includes a refuelling pistol or corresponding device. The arrangement also includes a sens and control device which functions to move the refuelling pistol aut matically from a rest position to the vehicle refuelling location, subsequent to the vehicle having been manouvered into a predeter¬ mined position relative to the robot. The refuelling pistol includes a rigid, first tubular element or pipe which is moved by the robot towards a receiving plate provided with an aperture incorporated in the vehicle refuelling location. A flexible, second pipe is displaσe ably mounted within the first, rigid pipe and can be moved from a first end position, in which the outer free end of the second pipe i located within the first pipe, to a second end position in which the second pipe projects out from the first pipe. A pipe connection is provided between said aperture and the tank-located vehicle refuelli pipe or tube. The robot is constructed to move the refuelling pipe out of the free end of the second pipe and down into the pipe connec tion or down into the vehicle refuelling pipe, and fuel is pumped through the second pipe down into the vehicle tank. One problem with this arrangement, however, is that it is necessary to equip the cars with a special adapter having a cap which can be opened by the robot head in order to establish communication between the head and the vehicle refuelling pipe. An advantage would be afforded if it were possible, instead, to retain the original petrol-cap cover plate of the car, i.e. the plate mounted on the car chassis and covering the space in which the petrol cap is located. In this case, a petrol cap constructed in accordance with the a oresaid patent specification would be required inwardly of the cover plate, in order to guide the flexible members of the robot head into the vehicle refuelling pipe. The problem remains, however, of constructing the robot so that it is capable of opening and closin the cover plates of different car models. The problem primarily consists in the fact that many different designs of car cover plates are found. The majority of modern cars, however, are equipped with a cover plate which lies in line with the su_ι_xcundi chassis and which can be swung between a closed and an open position about a vertical axle. Normally, a recess is provided in the chassis or an outwardly curved surface is provided on the cover plate, so that a finger can be readily inserted between the plate and the chass with the intention of opening the plate. The design, however, differs widely from car to car. The aforesaid problems are solved by means of the present invention, which provides a method and an arrangement for opening the cover plate with the aid of a robot, despite the various plate designs on different makes of vehicle. The present invention thus relates to a method for opening and closin a vehicle petrol-cap cover plate which lies in the line of the vehicl chassis and which can be swung between an open and a closed position about a vertical or horizontal axle and which covers the space in which the mouth of the vehicle refuelling pipe is located, said method being characterized by opening the cover plate in two stages, where in a first opening stage the flap is opened slightly to a limited open position by means of a first opening device, such as to enable a second opening device to be inserted between the plate and the chassis, wherein in a second opening stage said plate is opened completely by means of said second opening device; and by causing the plate to swing from its open to its closed position, by means of said second opening device. The invention also relates to an arrangement of the kind having the primary features set forth in Claim 6. The invention will now be described in more detail with reference to the accompanying drawings, in which - Figure 1 illustrates part of a vehicle provided with a petrol-cap cover plate and further illustrates part of a robot head and an inventive arrangement; - Figures 2-8 illustrate a plate opening sequence; - Figures 9 and 10 illustrate a plate closing sequence; - Figure 11 illustrates a suction cup; - Figure 12 illustrates an alternative embcxliment of a first plate opening device. Figure 1 illustrates an arrangement constructed in accordance with the invention. The arrangement is intended to open and close a petrol cap cover plate 1 provided on a vehicle 2. The plate 1 lies in the li of the vehicle chassis and can be swung between an open and a closed position about a vertical or horizontal axle 3. The plate covers the space 4 in which the mouth of the vehicle refuelling pipe (not shown) is located, in a known manner. Figure 1 also illustrates a robot head 5 which includes position sensing means for sensing or detecting the position of the robot head relative to a transponder 6 positioned behind or in the cover plate, or positioned at some other location. The robot head also includes fuel pipes. The robot head may be constructed appropriately in accor- dance with the aforesaid Swedish patent specification. However, a positioning system other than that described in the afore¬ said patent specification can be used. For example, an optical system can be used. The inventive arrangement includes a first cover-plate opening device 10 which is intended to open the plate 1 slightly in a first opening stage, to a restricted open position, illustrated in Figure 5. The arrangement also includes a second cover-plate opening device 11 which is intended for insertion between the cover-plate 1 and the chassis 12 when the plate 1 occupies its limited open position, see Figure 6. The second opening device 11 is intended to open the cover- plate 1 completely in said second stage, by executing a lateral movement with said second opening device 11 in abutment with the rear side 13 of the cover-plate 1, see Figures 7 and 8. The second opening device 11 is also intended to swing the cσver- plate 1 from its open to its closed position, by executing a lateral movement with the second opening device in abutment with the outside 14 of the cover-plate 1, see Figures 9 and 10. According to one preferred er±odiment of the inventive arrangement, the two opening devices are attached to a body 19, which in turn is attached to the robot head. In this way, all movements are effected by movement of the robot head. Alternatively, the inventive arrange¬ ment may be such as to enable the body 19 to be moved through the intermediary of separate movable devices. As beforementioned, the inventive arrangement operates to open the cover-plate 1 in two stages, wherein the plate 1 is opened slightly to a limited open position in a first stage, see Figure 5, by means of the first opening device 10, such as to enable the second opening device 11 to be inserted between the cover-plate 1 and the chassis 12. In a second opening stage, the plate l is opened completely by means of the second opening device 11. The cover-plate 1 is swung from its open position to its closed position by means of the second opening device 11. When the refuelling robot is used to refuel a car, the robot head is moved forwards against said transponder 6, as described in the afore¬ said patent specification. This is illustrated in Figure 1, which show the robot head 5 moved forwards in the Y-direction, along the broken line 15. Subsequent to the robot head being located in a predetermined position relative to the transponder 6, the robot head is moved slightly in the X-direction, see Figure 2, whereafter said head is moved in the Z-direction, towards the cover plate 1, see Figures 3 and 4, such that in the first opening stage the first opening device 10 is brought into abutment with the cover plate 1 in a region 16 which is opposite the edge 17 along which the cover plate is hinged in relation to the chassis 12. The second opening device is mounted resiliently by means of a spring 17, so that said device is able to spring in the direction of the arrow 18 relative to the body 19 of said arrangement, see Figure 3. When the first opening device 10 is in abutment with the cover-plate 1, see Figure 4, the opening device 10 is caused to execute an out¬ wardly directed, limited movement, i.e. a movement in the negative Z-direction, thereby moving the cover plate to said limited, open position, see Figure 5. The second opening device 11 includes a mechanical member, such as an arm 20, which with the cover-plate 1 in said limited open position is inserted behind the cover-plate 1 at the edge opposite to the edge along which the cover plate is hinged relative to the chassis, see Figure 6. This is effected by moving the robot head in the X-directio The second opening device 11 is then caused to act on the rear side 13 of the cover-plate and to move laterally, such as to open the cover-plate cαπpletely, see Figures 7 and 8. This lateral movement is effected by moving the robot head in a ∞ordinated movement in the X-Z-plane. According to the method, the cover-plate 1 is closed by moving the second opening device 11 laterally with said device in abutment with the outside 14 of the cover-plate, such as to swing the plate from its open to its closed position, see Figures 9 and 10. This lateral movement is also effected by causing the robot head to execute a coordinated movement in the X-Z-plane. Filling of the vehicle takes place subsequent to moving the cover- plate to the fully-open position illustrated in Figure 8. As mentione in the aforegoing, the robot head takes a predetermined position in relation to the transponder. The robot then measures its movements effected when the cover-plate is opened, such that the position of the robot relative to the vehicle chassis is always known. The trans- ponder has stored therein relevant information concerning the positio of the fuelling pipe relative to the position of the transponder. The transponder may also contain information corκ_^rτιing the precise movements to be carried out by the robot head in order to open the cover plate in the aforedescribed manner. The transponder may also contain information as to whether the cover- plate is hinged on a vertical axle or a horizontal axle. The case where the cover-plate is hinged on a vertical axle is described below. When the cover-plate is hinged on a horizontal axle, a cor¬ responding set of movements in the Y-Z-plane is carried out instead. Beginning from the position illustrated in Figure 8, the robot head moves in the negative Z-direσtion, whereafter the robot head is moved to the filling pipe. When refuelling of the vehicle is completed, the robot head is moved to the position shown in Figure 9, therewith closing the cover-plate in the aforedescribed manner. According to a first eriibodi ent, the first opening device 10 includes one or more suction cups 21 which cc παinicates/cαmmunicate with a sutpressure source (not shown) through a hose 22. The suction cups are intended to abut the cover-plate in a region opposite the edge along which the cover-plate is hinged relative to the chassis, where- after subpressure is applied prior to the opening device executing the outwardly directed, limited movement. Figure 11 illustrates, by way of example, a suction cup arrangement seen in the direction of arrow 23 in Figure 1. This suction cup arrangement includes nine suction cups 24 disposed in a diamond pattern. This construction ensures that a number of suction cups will always be in good contact with the outer surface 14 of the cover-plate 1. Ac∞rding to a second embodiment, the first opening device 11 includes a permanent magnet or an electromagnet 25, see Figure 12, which is intended to abut the cover-plate 1 in a region opposite to the edge along which the cover-plate is hinged relative to the chassis. When electric current flows in the electromagnet, or when a permanent magnet is used, the magnet is either intended to exact with the cover-plate 1, provided that said plate is constructed from magnetic material, or, alternatively, to coact with a magnetic member 26 attached to the rear side 13 of the cover-plate. The first opening device may be provided with one or more springs 27 made of steel or rubber material, such that the opening device will be brought smoothly and gently into abutment with the cover-plate 1. The first opening device is also preferably pivotally suspended relative to the body 19, via a hinge 28, against the action of a spring force. A very iπportant feature of the present invention resides in the fac that the cover-plate is opened in two stages, wherein in the first stage cover-plates of different types can be opened by means of the afore-described opening device, and wherein the second opening stage can also be effected with cover-plates of different designs. The present invention can be modified with respect to its constructi For example, the two cover-plate opening devices may have a different construction to that shown, without departing from their functional operation. Among other things, the first opening device may include both an electromagnet and suction cups. The present invention shall not therefore be considered restricted to the aforedescribed einbodiments, since modifications and variations can be made within the scope of the following claims.

Claims: Claims 1. A method for opening and closing a cover-plate on an automotive vehicle, said plate lying in the line of the vehicle chassis and capable of being swung between an cpen and a closed position about a vertical or a horizontal axle and which covers the space in which the mouth of the vehicle refuelling pipe is located, ch a r a c t e ¬ r i z e d by opening the cover-plate (1) in two stages, wherein said cover-plate is opened slightly to a limited position in a first stage, by means of a first opening device (10) such as to enable a second opening device (11) to be inserted between the cover-plate and the chassis (12) , and wherein, in a second stage, the plate (1) is opened completely by means of said second opening device (11) ; and by swinging the plate from its open to its closed position by means of said second opening device. 2. A method according to Claim 1, ch a r a ct er i z e d in that the first opening device (10) includes one or more suction cups (21) which comnMnic_ates/cc_mmunicate with a sutpressure source, said suction cup or cups being brought into abutment with the cover-plate (1) in a region (16) opposite to the edge (17) along which the cover-plate is hinged relative to the chassis; and in that the first opening device (10) is caused to effect an outwardly directed, limited movement such as to open the cover-plate (1) to said limited open position. 3. A method according to Claim 1, ch a r a c t e r i z e d in that the first opening device (10) includes a permanent magnet or an electrcmagnet (25) which is brought into abutment with the cover- plate (1) in a region (16) opposite the edge (17) along which the cover-plate is hinged relative to the chassis; in that the magnet is caused to coact with the cover-plate (l) , provided that said plate is made of a magnetic material, or, alternatively, to coact with a member (26) made of magnetic material and attached to the rear side (13) of the cover-plate (1) ; and in that the first opening device (10) is caused to effect an outwardly directed, limited movement such as to open the cover-plate (1) to said limited opening position. 4. A method according to Claim l, 2 or 3, c h a r a c t e r i z e d in that said second opening device (11) includes a mechanical member (20) , such as an arm, which in said limited open position is inserte behind the cover-plate (1) at said edge located opposite the edge (17) along which the cover-plate is hinged relative to said chassis; and in that said second opening device (11) is thereafter caused to coact with the rear side (13) of the cover-plate and therewith execu a lateral movement such as to fully open the cover-plate. 5. A method according to Claim 1, 2, 3 or 4, c h a r a c t e r i ¬ z e d in that the cover-plate (1) is closed by causing the second opening device (11) to move laterally with said device in abutment with the outer surface (14) of the cover-plate (1) , such as to swing the plate (1) from its open to its closed position. 6. An arrangement for opening and closing a cover-plate on an automo¬ tive vehicle, said plate lying in the line of the vehicle chassis an capable of being swung between an open and a closed position about a vertical or horizontal axle and covering the space in which the mouth of the vehicle refuelling pipe is located, ch a r a ct e r i z e d in that a first opening device (10) is provided for opening the cover-plate (1) slightly to a limited open position in a first openin stage; in that a second opening device (11) is provided for insertion between the cover-plate (1) and the chassis (12) with the cover-plate in its limited open position, said second opening device (11) being intended to open the plate (1) ccatrpletely in a second opening stage, by effecting a lateral movement with said second opening device (11) in abutment with the rear side (13) of said cover-plate; and in that the second opening device (11) is intended to swing the cover-plate (1) from its open to its closed position, by executing a lateral movement with said second opening device (11) in abutment with the outside (14) of the cover-plate. 7. An arrangement according to Claim 6, c h a r a c t e r i z e d in that the first opening device (10) includes one or more suction cups (21) which cαiimunicates/cσmmunicate with a subpressure source, said suction cup or cups (21) being intended for abutment with the cover-plate (1) in a region (16) thereon opposite to the edge (17) along which the cover-plate is hinged in relation to the chassis; and in that the first opening device (10) is intended to execute an outwardly directed, limited movement and thereby cpen the cover-plate to said limited open position. 8. An arrangement according to Claim 6, ch ar a ct er i z e d in that the first opening device (10) includes a permanent magnet or an electr nagnet (25) which is intended to abut the cover-plate (1) in a region (16) opposite the edge (17) along which the cover-plate is hinged relative to the chassis; and in that the magnet is either intended to coact with the cover-plate (1) , provided that said plate is made from a magnetic material, or, alternatively, to coact with a member (26) made of magnetic material and attached to the rear side (13) of the cover-plate (1) ; and in that the first opening device (10) is intended to execute an outwardly directed, limited movement, such as to open the cover-plate to said limited open position. 9. An arrangement according to Claims 6, 7 or 8, char a c ¬ t e r i z e d in that said second opening device (11) includes a mechanical member (20) , such as an arm, which is intended for inserti behind the cover-plate (1) with said plate in its limited open posi¬ tion.

Inventors: CORFITSEN STEN, CORFITSEN, STEN
Applicants: CORFITSEN STEN, CORFITSEN, STEN
Application year: 1991
Main classification: B67D5
IPC codes: B60K15, B67D5