ES2572928T3 - Drive circuit module for a vehicle door - Google Patents

Abstract

Hydraulic drive circuit module (62) for opening and closing at least one vehicle door (4; 5), for example a bus, with a) at least one branch of hydraulic conduit (branch of closing duct 18; opening duct branch 20) that can be attached or is connected to a pressure chamber (14; 15) of a hydraulic actuator (2; 3), depending on the hydraulic request of the pressure chamber (4; 15) of the electrical request of an electric drive module (31) of a pump (29) and the vehicle door (4; 5) being requested, due to the hydraulic request of the pressure chamber (14; 15), in a direction of opening (10) or a closing address (11), b) an electronic control unit (47) that has a control output (50), through which the speed of the electric drive module can be regulated (31), c) with a first input connection (58; 59) of the control unit electronic ion (47), which can be attached or is connected to the position sensor (52; 53) for the detection of the position of the vehicle door (4; 5), d) a second input connection (71) of the electronic control unit (47), to which a signal corresponding to the electrical request of the electric drive module (31) of the pump (29), in the case of a current of the electric drive module, a voltage or an absorption of electric power of the electric drive module or of a magnitude correlated with the same, e) the control unit (47) being equipped with a control logic that ea) both on the basis of the signal at the first input connection (58; 59) for the position sensor signal (52; 53 ) eb) as on the basis of the signal in the second input connection (71) corresponding to the electrical request of the electric drive module (31) of the pump (29) generates, adapts or regulates a control signal in the control output (50) for l a regulation of the number of revolutions of the electric drive module (31) of the pump (29), characterized in that the control logic of the control unit (47) determines an operational state of the vehicle door and / or performs a error analysis of the drive circuit module (62) and in this respect f) is properly configured to regulate the number of drive revolutions of the electric drive module (31) of the pump (29) depending on the signal in the second input connection (71) corresponding to the electrical request of the drive module (31) of the pump (29), fa) deducting, in case of a reduced electrical request of the drive module (31) of the pump ( 29), a leak or other defect and / or fb) deducting from an increased electrical solicitation (29) of the drive module (31) of the pump (29) a resistance of the vehicle door (4, 5), the imprisonment of a The person through the vehicle door (4, 5) or the scope of an end position and / or g) is properly configured to regulate the number of drive revolutions of the electric drive module (31) of the pump (29) both as a function of the output signal of the position sensor (52, 53) and as a function of the signal at the second input connection (71), which corresponds to the electrical request of the pump drive module (31) ( 29), ga) deducting, in case of an increased electrical request of the drive module (31) of the pump (29) and for an output signal from the position sensor (52, 53) indicating that the vehicle door ( 4, 5) it is not in a final position, a imprisonment of a person or the collision of the vehicle door (4, 5) against an obstacle and / or gb) being deducted, in case of a reduced electrical request of the module pump drive (31) (29) and for a sa signal The position sensor (52, 53) indicates that the vehicle door (4, 5) is not in an end position, a leak or other defect.

Description

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DESCRIPTION

Drive circuit module for a vehicle door Technical field of the invention

The present invention relates to a hydraulic drive circuit module that serves to open and close at least one vehicle door of a vehicle, for example a bus. The invention also relates to a regulation unit for a hydraulic drive circuit module of this type.

State of the art

Conventional buses are usually equipped with compressed air installations, for example a pneumatic brake installation and / or a pneumatic damping system. In consistency with this type of existing compressed air installations, in the past mainly pneumatic adjustment drives were used for the opening and closing of the automobile vehicle doors.

The document DE102006031477B4 of the applicant discloses a pneumatic swing drive for heavy vehicle doors of a bus. A spindle is rotatably and axially slidably supported within a housing of the rotation drive. The spindle passes through the housing, a free shaft end protruding from the housing being coupled to the pivoting vehicle door. The rotation drive has a double plunger and cylinder unit in which a single plunger delimits pressure chambers that act on both sides opposite each other. The plunger can slide axially inside the cylinder, but is guided in a non-rotating manner as a result of two guide rods that pass through the plunger. The plunger is also crossed by a spindle. The spindle is in active union with the plunger through two rollers supported and sealed with respect to the plunger, which rotate in opposite thread passages of the spindle. Therefore, with a sliding of the plunger as a result of a change in the pressurization of the air chambers, therefore, a spindle rotation movement can be produced which results in a pivoting movement of the assigned vehicle door. As a consequence of the vehicle's own weight, during this time there is no axial movement of the spindle. In a final position of the plunger, correlated with the closing position of the vehicle door, the rollers reach an exit zone or a stop of the thread passages. An additional pressurization of the pressure chamber acting in the direction of this final position therefore does not lead to an additional relative movement between the spindle and the plunger. Rather, this additional pressurization results in a common axial movement of the plunger and the spindle which causes the vehicle door to rise in the closed position of the vehicle door. With this movement of the vehicle door vertically upwards, interlocking pivots of the vehicle door can enter corresponding housings of the door frame, thereby locking the vehicle door, such that vehicle door cannot rattle or dance during the march. A corresponding vertical lift movement occurs when the movement of the vehicle door is hindered during the closing movement of the vehicle door, for example by a person blocking the vehicle door. It is desirable a kind of "final position damping" that should cause the speed of movement of the vehicle door to be reduced when approaching the final positions. To do this, the mentioned patent proposes to reduce or throttle the access section of the compressed air to the pressure chambers in the area of the final positions.

The document DE102010002625A1 of the applicant proposes instead of the use of a pneumatic or electric adjustment drive for a vehicle door of a bus a hydraulic adjustment device, whereby the vehicle door can be loaded to the opening or driving position. closing. In the adjustment drive, the generation of a turning movement of a rotating column of the vehicle door is carried out through a cogwheel that is coupled to the rotating column fixedly to the drive and that meshes with a rack. A movement of the zipper in the opening direction or the closing direction is caused by two hydraulic pressure chambers acting respectively in a final area on the zipper in the opening direction and the closing direction. The pressure chambers are fed through branches of hydraulic conduit that are connected to each other through a reversible pump. Therefore, according to the direction of operation of the pump, the hydraulic means is transported from a pressure chamber to the other pressure chamber and vice versa, which entails an opening and closing movement of the vehicle door. In addition to the aforementioned degree of rotational freedom of the gearwheel and the rotating column around a rotation axis, the drive elements of the vehicle door also have a degree of freedom of movement in the direction of the rotation axis, to enable with an elevation movement, an elevation of the rotating column with the vehicle door for interlocking the vehicle door. In order to generate the interlocking lifting movement, another plunger and cylinder lifting unit is provided which, with a hydraulic request, acts opposite to the weight of the rotating column and the vehicle door in the lifting direction. The pressure chamber of the plunger and cylinder lifting unit acting in the direction of elevation is hydraulically coupled to the pressure chamber acting in the direction of closure, through a check valve that opens in the direction of the chamber of pressure of the piston and cylinder lifting unit. The opening pressure of the check valve is adjusted in such a way that for small pressures in the pressure chamber outside the final closing position, the check valve maintains its closing position, while reaching the position

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of closing and when increasing the pressure in the chamber of pressure, that acts in the direction of closing, and in the branch of pipe of assigned closing opens the valve of retention. In this way, the generation of the rotation movement by the pressure chamber on the one hand and the generation of the elevation movement on the other hand are separated in time, so that the elevation movement begins only after reaching the position of closing. The analog is valid for the union of the pressure chamber of the plunger and cylinder lifting unit, through an additional check valve, to a pressure sump, to cause an unlocking before the opening movement is generated: starting from the locked closing position, the check valve is only unlocked to allow an evacuation of the hydraulic fluid from the pressure chamber of the plunger and cylinder lift unit, when the pressure has reached in the pressure chamber acting in the direction opening a pressure level higher than the usual pressure level for the movement of the vehicle door in the direction of opening for a loose lock.

Other adjustment drives for vehicle doors, especially pivoting doors, which are operated with a pressure means, were disclosed by documents DE2727506C3 and EP0279237B2.

Document AT409521B discloses a hydraulic drive circuit module with a double-acting hydraulic cylinder featuring two pressure chambers acting in the opposite direction, whose adjustment movement is coupled to a pivoting vehicle door. A solicitation of the pressure chambers is made through a branch of the opening duct and a branch of the closing duct that are fed by a reversible pump in the direction of transport. Linear travel sensors in the hydraulic cylinder or turn sensors on a vehicle door pivot axis can monitor the movement of the vehicle door. In addition, the pressure of the hydraulic medium in the drive circuit module is monitored by pressure sensors. This monitoring will then signal the scope of a final position. Additionally, an anti-imprisonment protection or a protection against starting must be carried out during the generally unimpeded pivot movement. Between the pressure chambers of the hydraulic cylinder a proportional check valve is inserted, the opening pressure of which can be adjusted by means of a control device. When the proportional clamping valve adopts a closed position, the automatic operation of the vehicle door can be produced by an alternative supply of the pressure chambers of the opposite action of the hydraulic cylinder. On the other hand, due to the opening of the proportional check valve, a connection can occur between the two pressure chambers, which can be freely traversed and which allows a transfer of the hydraulic means without pump action and, therefore, a manual movement of the vehicle door. The opening pressure of the proportional check valve may be designed according to the maximum weight load in the most unfavorable position of the vehicle, so that in the case of another excess pressure, for example when the vehicle door hits an obstacle , the proportional check valve is opened, so that (corresponding to a mechanically set pressure limitation valve), an anti-collision protection and a protection against damage are easily realized. Additionally, the document proposes that through a sensor an inclination of the vehicle is recorded or that a sensor records the movement of the vehicle door, and a development of the moment at the vehicle door may also be considered, which varies as along the path traveled and resulting from the changing lever conditions and the kinematics of the vehicle door suspension. Through a control signal of a control unit, the opening pressure of the proportional check valve can be adapted in such a way that a drive of the vehicle door always occurs with the same force causing the movement, so that It results in a constant clamping force and eventually limited to a minimum. The document also proposes to detect a traction or manual pressure on the vehicle door through pressure sensors and / or a travel sensor. Then, through a control device, the pressure level in the pressure chambers is adjusted so that a maximum working pressure results that is just not enough for the vehicle door to be driven by the hydraulic cylinder, but that If you support the manual operation of this with a variable force in each situation and position of the vehicle door. Then, the user can move the vehicle door in any situation of the vehicle door manually with a constant force, which is advantageous for example when another vehicle is parked near the vehicle that could be damaged in case of an automatic door actuation .

Another state of the art was disclosed by documents AT409656B and EP1134431A1.

Objective of the invention

The present invention has the objective of providing a hydraulic drive circuit module for the opening and closing of at least one vehicle door, for example of a bus, which is especially improved in terms of

- operational safety,

- guarantee predefined positions of the vehicle door,

- the opening and closing course,

- the opening and closing forces,

- the complexity of the structure,

- the cost of assembly and the expense of sensors and / or

- the detection of failures or emergency situations.

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Solution

The object of the invention is achieved according to the invention with the characteristics of the independent revindication 1. Other embodiments of this solution are in accordance with dependent claims 2 to 14.

Description of the invention

According to the invention, first of all, instead of an electric drive circuit or a pneumatic drive circuit, a drive circuit module that is operated hydraulically is used. In comparison with a pneumatic pneumatic adjustment drive, with a hydraulic adjustment drive, another opening and closing behavior of the vehicle door can be achieved. In pneumatic adjustment drives, for example, the elastic characteristics of the pneumatic medium are problematic, which can lead to a vehicle door position, for example the closing position, which is exclusively pneumatically secured, is left unwanted in case of the action of forces under the elastic request of the pneumatic medium. This has as a consequence especially that the vehicle door with a hydraulic adjustment drive has a lower tendency to rattle or dance while driving. Although, however, it is possible that with the hydraulic drive circuit module according to the invention, a vehicle door lock will still occur, when using the hydraulic drive circuit module, it is even possible to completely dispense with a door lock completely. vehicle, which requires complicated construction, while securing the closing position is produced by the hydraulic means and the hydraulic adjustment drive.

According to the invention, the hydraulic drive circuit module has at least one branch of hydraulic conduit that can be attached or is connected to the pressure chamber of a hydraulic actuator. With the request of said hydraulic actuator, a request for the vehicle door in the opening direction or the closing direction can occur. In the context of the present invention, any realization of the at least one actuator is possible. For example, a single actuator can be provided with a single pressure chamber that works against a spring, so that the movement of the actuator not generated with the pressurization of the actuator is produced by the spring. But preferably two duct branches with assigned pressure chambers of an actuator are used, which then respectively pressurize the generation of forces and / or movement in the opening direction and the closing direction. Actuators with the pressure chambers for the two mentioned directions can also be made separately from each other. But preferably double acting actuators are used, which results in a particularly compact embodiment.

The hydraulic drive circuit module according to the invention has an electronic regulation unit. The electronic regulation unit has a control output. Through the control output the number of revolutions of the electric drive module can be regulated, so that there is also a regulation of the transport capacity or the flow of the pump and a regulation of the hydraulic request of the less a duct branch, preferably both the opening duct branch and the closing duct branch. Therefore, through the control input the regulation of the opening and closing behavior of the vehicle door is finally produced.

In addition, the electronic regulation unit of the hydraulic drive circuit module according to the invention has two input connections that can be made respectively separately or as a combined connection and that can form an external interface of the hydraulic drive circuit module or be made as an internal connection of the control unit inside the drive circuit module.

A first input connection of the electronic control unit can be attached or is connected to a position sensor that directly or indirectly detects the position of the vehicle door or of an actuating element coupled with the vehicle door. The "position sensor" according to the patent encompasses any sensor that binary, digital or analogically detects a vehicle door position. To mention just a few non-restrictive examples, the position sensor may be a limit switch. , a rotation angle sensor, a travel sensor or the like.

To the second input connection of the electronic regulation unit is supplied a signal that corresponds to the electrical request of the electric drive module of the pump. In this electrical application it is for example a current of the electric drive group, a voltage or an absorption of electric power of the electric drive group or of a magnitude correlated therewith. This embodiment is based on the knowledge that the electrical request of the electric drive module does not only depend on the control signal at the control output of the electronic regulation unit, through which the number regulation is performed of revolutions of the electric drive module. Rather, the electrical request of the electric drive module of the pump varies according to the operational state of the hydraulic drive circuit module. To mention just one example, a higher pressure on the outlet side of the pump, that is, for example a greater pressure on the opening duct branch and / or the closing duct branch requires for the same number of Revolutions of the electric drive module a greater electrical request than is the case for a lower pressure on the outlet side of the pump. Therefore, according to the

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invention, the electrical request can be used as an auxiliary magnitude or indication for the pressure on the outlet side of the pump, that is, also the pressure in a branch of opening duct, in a branch of closing duct or in a chamber of pressure Without necessarily the case, by the realization according to the invention a pressure sensor can even be made dispensable in the hydraulic drive circuit module.

According to the invention, the regulation unit is provided with a control logic or is programmed in such a way that it generates a control signal at the control output. Said control signal can be used for the regulation of the electrical request of the pump drive module or directly for the electrical request and therefore for the regulation of the hydraulic request of the at least one branch of the hydraulic conduit, preferably of both branches. of hydraulic conduit. The embodiment according to the invention takes advantage of the knowledge that for an optimal operation of the hydraulic drive circuit module it is not enough for the regulation unit to regulate the electrical request of the pump drive module, and therefore the hydraulic request, only on the basis of the position sensor signal. But it has also been shown that it is not enough to regulate the hydraulic request only on the basis of the signal of a pressure sensor (or of the electrical request of the electric drive module). Rather, the invention has found that improved regulation is only possible if the control logic of the control unit processes both the signal of the vehicle door position sensor and the signal of the electrical request of the electric drive module, correlated with pressure. There are multiple possibilities for the type of processing of these two signals. To mention just a few examples, in certain operating situations, the regulation unit may, to regulate the number of drive revolutions and in other operating situations, resort to the signal of the electrical request of the drive module for the regulation of the number of drive revolutions of the drive module and / or, for a regulation of the number of drive revolutions of the drive module in the same operating situation, resort to both signals and generate from these joints the control signal for the number of drive revolutions. Another example of an embodiment according to the invention can be that basically the regulation of the number of driving revolutions is performed on the basis of one of the mentioned signals, while through the other signal a monitoring is carried out to monitor the Correct operation of the hydraulic drive circuit module, generate an error message and / or initiate, if necessary, an emergency service mode of the hydraulic drive circuit module.

For an embodiment according to the invention of the control logic, the regulation of the number of drive revolutions of the electric drive module of the pump is carried out according to the signal in the second input connection corresponding to the electrical request of the pump drive module.

- There is a possibility that with a reduced electrical request in at least one branch of the duct a defect can be deduced, for example a leak from a hydraulic conduit that causes the decreased electrical request. For example, by the control logic, the electrical request can be compared with a threshold value and if it falls below the threshold value the defect can be deduced. In case of a defect detected in this way an error message can be generated for the user or the driver in the form of an acoustic or optical signal. Likewise, a modified mode of operation of the hydraulic drive circuit module may occur, especially a reduction in the number of drive revolutions or a disconnection of a pump. It is also possible that in this case there is an automatic connection between an opening duct branch and a closing duct branch, in order to continue allowing at least one manual opening or closing of the vehicle door.

- For another embodiment of the invention, an increased electrical request is monitored by the control logic. An increased electrical request of this type can be evaluated as an indication of whether there is a resistance to the movement of the vehicle door or if a person is hooked by the vehicle door. Also in this case, for the simplest realization of this idea, by means of the regulation unit and the control logic, it can be monitored if an increased electrical request occurs above a threshold value. Alternatively or additionally, the control logic also considers for the regulation the output signal of the position sensor.

- The number of drive revolutions can be decreased when the output signal of the position sensor indicates that an approximation of the vehicle door is being produced to a final position of the vehicle door, in order to prevent the vehicle door from colliding in the final position at full speed against a vehicle frame or similar.

- Alternatively or additionally, the number of drive revolutions can be reduced to zero when a final position of the vehicle door has been reached.

- Likewise, it is possible that the control logic is realized in such a way that the number of drive revolutions is regulated according to the output signal of the position sensor, that is, finally depending on the position of the vehicle door .

- Alternatively or additionally, it is also possible that a number of constant or variable usual drive revolutions for normal operation is changed to a number of drive revolutions in case of defect in case of changed pressure conditions or changed flow developments. This can be started automatically when the position sensor output signal indicates that the position of the vehicle door is outside an end position, but a speed signal for a change of vehicle door position passes below of a threshold value or has a passage through

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zero. The speed signal of the change of position of the vehicle door can be registered by a separate sensor. It is also possible that this is generated from the first temporary derivative of the output signal of the position sensor. Finally, with the evaluation steps mentioned last, it is evaluated whether the vehicle door decreases the opening or closing speed, even if the vehicle door has not reached any final position. This can be assessed as an indication that a person is engaged in the vehicle door or that another type of obstacle in the operation of the vehicle door or in the area of movement of the vehicle door hinders the opening or movement of closing.

For another embodiment according to the invention of the control logic, the regulation of the number of drive revolutions is carried out both in function of the output signal of the position sensor and in function of the signal in the second corresponding input connection to the electrical request of the pump drive module. For example, if the control logic detects an increased electrical request of the pump drive module, while at the same time there is an output signal from the position sensor indicating that the driver's door is not in a final position, the Control logic evaluates it as an indication that a person is imprisoned or that the driver's door hits an obstacle or that the drive mechanism is otherwise locked. On the other hand, if a diminished electrical request of the pump drive module is detected, while at the same time there is an output signal from the position sensor that indicates that the driver's door is not yet in a final position, it can be deduced a leak or other corresponding defect. Therefore, according to the invention, in both mentioned operating situations it can be distinguished whether an increase in the electrical request of the drive module is due to the fact that the vehicle door has reached a final position or if the vehicle door is locked out of the final position, which would not be possible in the case of the single evaluation of a signal from a pressure sensor. It is then possible that the aforementioned service situations are used by the regulation unit to automatically initiate appropriate appropriate measures, for example a new opening or a new closing of the door, the generation of an optical or acoustic warning signal or the like .

In another embodiment of the invention, the regulation unit has a third additional input connection that can be attached or is connected to a pressure sensor. Said pressure sensor can be used to detect the pressure in one of the pressure chambers or a differential pressure between the pressure chambers, the pressure sensor being able to work also in binary form, especially as an automatic pressure increase switch with a switching in case of a predefined threshold value, which can work digitally or analogically. In this case, the pressure in the pressure chamber can be measured directly by means of the pressure sensor or indirectly, for example in such a way that a pressure is measured in a duct branch towards the pressure chamber. For this embodiment of the invention, the control signal at the control output of the regulation unit for the regulation of the number of revolutions of the electric drive module is additionally pending the signal of the pressure sensor, whereby for example, a more redundant or more accurate detection of the service situation is possible and monitoring of valve service positions within the drive circuit module and the like can be performed.

In another embodiment of the invention, there is an opening duct branch in the hydraulic drive circuit module. A pressure chamber acting in the opening direction can be connected to said opening duct branch. In addition, there is a branch of the closing duct to which it can be connected or a pressure chamber that acts in the closing direction is connected. It is understood that also an opening duct branch and / or a closing duct branch may be responsible for the hydraulic request of several pressure chambers assigned to different vehicle doors.

It is possible that the pressure conditions in the opening duct branch and in the closing duct branch can be modified through different pressure sources and pressure sinks. It is also possible to use a single pressure source, especially a pump that always works in a transport direction and that through a switchable valve device can pressurize the opening duct branch or the closing duct branch with a hydraulic fluid. , while the other pressure chamber joins a pressure sink. In a preferred embodiment of the invention, however, between the opening duct branch and the closing duct branch, a pump can be inserted. The control unit generates a control signal at the control input, whereby the pump can be switched from a transport direction in an opening direction to a transport in a closing direction and vice versa. This constitutes a particularly simple, but efficient embodiment of the power of the hydraulic drive circuit module with a hydraulic fluid under pressure.

In another embodiment of the invention, the hydraulic request of at least one duct branch can be regulated by a modification of the number of drive revolutions of the electric drive module of the pump. For this, the control unit can adjust different discrete values for the number of drive revolutions, especially two, three or four different drive speed numbers. It is understood that a continuous adjustment of a number of drive revolutions of the electric drive module of the pump can also be made.

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It is possible that only a pressure sensor is assigned to the opening duct branch, that is to the opening duct branch or the closing duct branch or to the assigned pressure chambers, and it is also possible that both in the duct branch opening as in the branch of the closing duct there is respectively a pressure sensor. But for a special embodiment of the invention, the pressure detection can be performed both in the opening duct branch and in the closing duct branch, even if a single pressure sensor is used: For this embodiment, between the opening duct branch and the closing duct branch is interleaved or a valve can be inserted. Said valve connects the pressure sensor, depending on the operating state or the hydraulic request of the opening duct branch and / or the closing duct branch, the opening duct branch or the closing duct branch. A valve of this type can be switched, for example, depending on the pressure in the mentioned duct branches. It is also possible that the valve is electrically switched based on a control signal of the regulation unit. To mention only one possible example, the regulating unit can control the valve in such a way that according to the direction of transport of the reversible pump interspersed between the conduit branches, the valve connects one of the mentioned conduit branches to the pressure sensor.

An especially simple embodiment of this solution idea results if the valve is made as a multi-way valve that has two inputs and one output. According to the invention, a first inlet of the multi-way valve is connected to the branch of the opening duct, while a second inlet of the multi-way valve is connected to the branch of the closing duct. Then, the output of the multi-way valve is connected to the pressure sensor. The multi-way valve joins the exit to the entrance in an especially simple way, whose pressure is just greater than the pressure at the other inlet. This can be reliably guaranteed without additional control measures of the control unit.

In a possible embodiment of the invention, the pressure in the pressure chambers and duct branches is ensured, for example through check valves, when no modification of the position of the vehicle door is desired. However, in the event of a failure, for example, of the electrical components of the hydraulic drive circuit, an emergency manual drive must be possible in order to always ensure that the vehicle door can be closed, but especially also opened. In an embodiment of the invention, this can be guaranteed because there is a manually operated valve that can be operated by hand. In a hand-induced emergency actuation position, the manually operated valve joins the opening duct branch to the closing duct branch to cancel the pressure lock mentioned above. By then exerting manual forces on the vehicle door, these forces move the hydraulic fluid from a pressure chamber, through the assigned duct branches and the manually operated valve, to the other pressure chamber, so it is possible to induce manually an opening and closing movement. The opening and closing forces that must be exerted manually for the manual movement of the door while the manual actuation valve is placed in the emergency actuation position depends on the hydraulic characteristics of the hydraulic fluid and the dimensioning of the hydraulic and hydraulic components. the cross sections of the ducts. With a greater throttling effect for the movement of the fluid between the two pressure chambers, the force that must be exerted manually on the vehicle door to open and close it increases.

In another embodiment of the hydraulic drive circuit module according to the invention, the pressure in the opening duct branch and / or the pressure in the closing duct branch is secured through an unlockable closing valve, especially a check valve unlockable. Although the present invention also encompasses, for example, an unlocking of the shut-off valve according to the present invention, electrically controlled by the regulating unit or pre-controlled electro-hydraulic, preferably, an automated unlocking of the shut-off valve or check valve as a function of a pressure in the opening duct branch or the closing duct branch, in the simplest case a hydraulic release is performed when a pressure threshold value in the mentioned duct branch is exceeded.

Although it is possible that the hydraulic drive circuit module has only connections that can be coupled to the input and output of a reversible pump, in another embodiment of the invention, a pump is integrated in the drive circuit module that is reversible according to the control signal present at the control output of the electronic regulation unit.

Another aspect of the invention is dedicated to the constructive realization of the position sensor. For this proposal of the invention, the position sensor is made with a potentiometer driven according to the rotation of a rotating column of the vehicle door. The potentiometer itself may be an integral part of the hydraulic drive circuit module according to the invention. Likewise, it is possible that an output signal from such a position sensor is supplied to an electrical connection of the electronic control unit.

It is also possible that the actuator is connected to the hydraulic drive circuit module through suitable conduits and connections. In an embodiment of the invention, the actuator however forms an integral part of the hydraulic drive circuit module according to the invention.

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Other embodiments of the invention are dedicated to the realization of the control logic that is implemented in the electronic regulation unit to regulate the number of drive revolutions of the electric drive module:

For another embodiment of the control logic, the regulation of the number of drive revolutions is also carried out according to the output signal of a position sensor. In this case, instead of the evaluation of a diminished or increased electrical request, the output signal of the pressure sensor is used as described above.

For a special embodiment of the invention, the control logic of the electronic control unit is properly configured to perform according to the signal in the second input connection corresponding to the electrical request of the drive module of the pump, a calibration of a pressure sensor and / or a function test of a pressure sensor. To mention only a non-restrictive example, knowing the maximum pressure on the outlet side of the pump, the maximum pressure in the drive circuit module can be set. Knowing the maximum pressure of the pump, the signal present then of the position sensor can be used for calibration. It is understood that for the calibration it is also possible to resort to more complex pressure developments. For example, with a filling of the drive circuit module, possibly also during a first commissioning, a pressure increase in known time dependence can be used for the calibration of the pressure sensor. In addition, the function test of a pressure sensor can be performed in such a way that, for example, by monitoring the electrical request of the pump drive module, it is detected that there is pressure in the drive circuit module, while when it is missing The pressure sensor signal can be deduced that the pressure sensor is defective.

Advantageous improvements of the invention are obtained by the claims, the description and the drawings.

Brief description of the figures

Hereinafter, the invention is explained and described in detail with the help of a preferable embodiment shown in the figure. The only figure shows a hydraulic drive circuit for a vehicle door of a bus with a drive circuit module according to the invention, in a schematic representation.

The only figure shows a hydraulic drive circuit 1 with two double-acting hydraulic actuators 2, 3, fed together, for two vehicle doors 4, 5, here vehicle door leaves. The vehicle door 4 (vehicle door 5) has a closing position 6 (closing position 7) as well as an opening position 8 (opening position 9) between which the vehicle doors 4, 5 can move in one opening direction 10 and a closing direction 11. Actuators 2, 3 are coupled to vehicle doors 4, 5 through a suitable drive connection. For the exemplary embodiment shown, the drive connection has a drive shaft 12 or rotating column, rotating with the movement in the opening direction 10 and the closing direction 11, which according to the drive connection according to DE102010002625A1 is coupled to a cogwheel (not shown) rotatable that engages with a rack 13. In Figure 1, rack 13 is guided horizontally for a movement in the opening direction 10 and the closing direction 11. This movement is generated by the hydraulic request of a pressure chamber 14 acting in the closing direction 11, as well as a pressure chamber 15 acting in the opening direction 10. The pressure chambers 14, 15 are respectively limited by a plunger 16 which is formed respectively by an end zone of the rack 13 or that is coupled thereto, as well as by a cylinder unit 17. For the embodiment example represented, the actuators 2, 3 are respectively realized as plunger units and double acting cylinder, but it is not essential.

The pressure chambers 14 acting in the closing direction are hydraulically fed from a branch of closing duct 18 which in a ramification 19 is divided into parts of branch of closing duct 18a, 18b towards the pressure chambers 14 of the two actuators 2, 3. Correspondingly, the pressure chambers 15 of the actuators 2, 3 are hydraulically requested through an opening duct branch 20 which through a branch 21 flows into portions of the duct branch opening 20a, 20b.

The opening duct branch 20 and the closing duct branch 17 can be connected through a drive valve 22 that can be operated by hand. For the exemplary embodiment shown, the manual actuation valve 22 is made as a 2/2 23 distributor valve or as a shut-off valve, the two positions of the 2/2 distributor valve being stable while maintaining manual actuation forces acting on the 2/2 distribution valve. To do this, as schematically represented, the 2/2 distributor valve can be equipped with a retention device that secures both possible positions of the 2/2 distributor valve. An actuation of the 2/2 distributor valve is carried out through an actuator 24, especially an actuation button that can be pressed and removed, a switch or the like. In the active position shown in the figure, for normal operation of the drive circuit 1, the duct branches 18, 20 are separated from each other in the area of the manually operated valve 22. For an emergency drive, it is possible actuate the actuating organ 24, which makes the valve

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2/2 distributor adopts its passage position in which it connects the duct branches 18, 20 between them and the "short circuits".

In the branch of the closing duct 18 and the branch of the opening duct 20, there are integrated check valves 25, 26 which open in the direction of the assigned pressure chamber 14, 15. The check valves 25, 26 respectively ensure a pressure once reached in an assigned pressure chamber 14, 15. In the end zones opposite to the pressure chambers 14, 15, the duct branches 18, 20 respectively terminate in hydraulic connections 27, 28 of a reversible pump 29 that through a rigid, switchable and / or by drive union 30 gear is reversibly actuated by an electric drive module 31. Depending on the direction of transport of the reversible pump 29, it transports hydraulic fluid to the branch of the closing duct 18 or the branch of the opening duct 20. The drive circuit 1 it is equipped with a hydraulic tank 32, from which the pump 29 can transport hydraulic fluid to the duct branches 18, 20. When the reversible pump 29 for example transports hydraulic fluid to the branch of the closing duct 18, the fluid circulates in the opening direction of the check valve 25 in the direction of the pressure chamber 14. While basically the check valve 26 is closed, so that as they increase The hydraulic request of the pressure chamber 14 cannot reach the hydraulic fluid of the pressure chamber 15 through the check valve at the connection 26 of the reversible pump 29, with the operation of the reversible pump 29 increases the pressure in the branch of closing duct 18a. The check valve 26 can be unlocked through a control line 33 that is derived from the closing line branch 18 behind the check valve 25 in the direction of opening of the RV 25. When the pressure in the branch line of shut-off duct 18 has increased sufficiently, through check duct 33 the check valve 26 is unlocked, so that finally hydraulic fluid can be transported from the pressure chamber 15 through the check valve 25 to the connection 28 Therefore, after the opening of the check valve 26, hydraulic fluid is transported, in a closed circuit itself, from the pressure chamber 15 to the pressure chamber 14. The analog is valid in the opposite direction with the reversal of the direction of transport of the reversible pump 29, for which also the check valve 25 can be unlocked through a control line 34 that is derived from an opening duct branch 20, so that also with a reversible pump operation 29 to generate an opening movement of the vehicle doors 4, 5, the hydraulic fluid is transported in a closed circuit itself. The two duct branches 18, 20 are coupled to each other in the direction of passage in front of the check valves 25, 26 through a joint duct 35 which through a branch point 36 is connected to the hydraulic reservoir 32 and a reversible pump supply connection 29. In the junction duct are integrated on both sides of the branch point 36 check valves 37, 38 which, seen from the branch point 38, close in the direction of the assigned duct branches 18, 20.

Another union duct 39 joins the duct branches 18, 20, the additional junction duct 39 being arranged behind the check valves 25, 26, seen in the direction of opening of the check valves 25, 26. In the duct of union 39 a valve 40 is integrated, through which the duct branches 18, 20 can be selectively joined to a pressure sensor 41, especially a pressure switch automatic switch 46. For the embodiment shown in the only figure, the valve 40 is made as a multi-way valve 42. This has a first inlet 43 that is attached to the opening duct branch 20, as well as a second inlet 44 that is attached to the closing duct branch 18 The outlet 45 of the multi-way valve 42 is hydraulically connected to an inlet of the pressure sensor 41 or of the circuit breaker 46.

The drive circuit 1 has an electronic control unit 47. The control unit 47 has a third input connection 48 which, through the power line 49 represented by broken lines, is connected to the output of the pressure sensor 41, of so that the pressure sensor signal 41 is supplied to the regulation unit 47. In addition, the regulation unit 47 has a control output 50, through which the hydraulic request of the conduit branches 18 can be regulated, 20. For the exemplary embodiment shown, the control output 50 is connected through an electric control line 51 to a control connection 70 of the electric drive module 31, so that according to the control signal at the output of control 50 the drive direction of the electric drive module 31 and therefore of the reversible pump 29 can be modified and / or the number of drive revolutions of the mo can be modified electric drive module 31 and pump 29, which is correlated with a modified hydraulic request of the duct branches 18, 20.

Drive circuit 1 has position sensors 52, 53 assigned respectively to actuators 2, 3, vehicle doors 4, 5 or interleaved drive connections. For the exemplary embodiment shown, the position sensors 52, 53 are made as rotary potentiometers 54, 55 coupled to the drive shafts 12. The outputs of the position sensors 52, 53 are connected, via electric lines 56, 57, at first input connections 58, 59 of the regulation unit 47, so that the output signals of the position sensors 52, 53 are supplied to the regulation unit 47.

It is possible that the control unit 47 is also responsible for an electric power supply of the electric drive module 31, the pressure sensor 41 and / or the position sensors 52, 53.

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Furthermore, as shown in the only figure, the regulation unit 47 can communicate, through input 60 and / or outputs 61, with other construction units, control or regulation units, display devices. To mention only a few non-restrictive examples, through the one input 60, a wish can be transmitted to the regulating unit 47, for example from a switch arranged at a distance, at least one vehicle door 4, 8 On the other hand, through an outlet 61, the regulation unit 47 can cause an acoustic and / or optical warning signal to be generated in the event of a defect eventually also at a distance. Without intending to restrict the invention to the aforementioned examples, a communication with an additional control unit can also be carried out through an outlet 61 of the regulation unit, which may be the case, for example, if the regulation unit 47 knows that a vehicle door 4, 5 has not yet been closed, so that at a regulation for the drive chain, an ignition and the like can be communicated that the vehicle is not yet ready for travel, so that it can be prevented The start of the march.

It is possible that a single regulation unit 47 is responsible for several doors 4, 5 that open and close together. If additional valves are integrated in the drive circuit 1, controlled by the regulating unit 47, the regulating unit 47 can also selectively open or close the door 4 or the door 5. It is possible that a bus It is equipped with several drive circuits according to the only figure for several groups of vehicle doors.

In the "hydraulic drive circuit module" requested with the claims, it can be the complete drive circuit 1 shown in Figure 1. However, it is also possible that in the hydraulic drive circuit module according to the invention it is only treated of partial elements of the drive circuit 1 shown in the figure. As an example, a hydraulic drive circuit module 62 comprising

- the regulation unit 47,

- the union duct 35 with the branch point 36 and with the check valves 37, 38,

- the check valves 25, 26 unlockable with the control ducts 33, 34 assigned,

- a partial area of the duct branches 18, 20,

- the union duct 39 with the valve 40 or the multi-way valve 42 and

- the pressure sensor 41 or the automatic pressure increase switch 46.

This drive circuit module communicates with the other components of the drive circuit 1 that are not an integral part of the drive circuit module 62, through electrical and hydraulic interfaces, especially with the first input connections 58, 59, with connections hydraulic lines 63 to 66 in which partial zones of the conduit branches 18, 20 that are an integral part of the drive circuit module 62 communicate with partial zones of the conduit branches 18, 20 that are not an integral part of the circuit module of drive 62. A drive circuit module 62 of this type may be composed of individual components that are connected to each other through the junction joints shown. Likewise, it is possible that the components of the drive circuit module 62 are integrated in a common housing. Finally, according to the invention it is also proposed that the drive circuit module 62 is made in a modular manner, for example with a regulation module 67 in which the regulation unit 47 is arranged, as well as with an additional module 68, being modules 67, 68 coupled to each other through interface 69 represented with dotted line in the only figure. The interface 69 can serve on the one hand for mutual support and for the fixing of modules 67, 68, and preferably a connection of electric and / or hydraulic conduits can also be made with the aforementioned fixation.

It is understood that a distribution can also be made among others or between more than the two modules 67, 68 mentioned.

Likewise, the expert will see that in some of the drive circuit module 62 according to the invention, some of the components and duct connections contained in the same figure may also not be contained, these may be arranged outside the drive circuit module 62. mention only one non-restrictive example, the junction conduit 35 with the branch point 36 and the check valves 37, 38 can also be arranged outside the drive circuit module 62.

However, it is also possible that in the drive circuit module 62 additional elements and connections are integrated which according to the only figure are arranged outside the drive circuit module 62. To also mention here only a non-restrictive example, the union can be also integrated in the drive circuit module, through the manual actuation valve 22.

In the present description, the terms are used

- "control", "control output", "control signal" and the like, on the one hand, and

- "regulation", "regulation input" and "regulation signal" and the like. A strict differentiation is not intended - rather, a regulation can also be a control, while when "control" is also used

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a "regulation" can be made.

The regulation unit 47 has a second input connection 71, through which a signal corresponding to the electrical request of the electric drive module of the pump is supplied to the regulation unit 47. It can be a current, a voltage or a power absorption of the electric drive module 31. This signal is used according to the invention as an indication of the pressure on the outlet side of the pump 29. It is possible that as a consequence of the Use of the signal in the second input connection 71 can be suppressed the pressure sensor 41 or the automatic switch by pressure increase 46. However, according to the invention the pressure sensor 41 or the automatic switch can also be used redundantly by pressure increase 46 with the signal of the electrical request of the drive module 31, present in the second input connection 71. This is useful for a "Fall-Back" solution, for example, in the event of a sensor failure. pressure 41, for a pressure sensor calibration 41, a learning procedure and the like.

List of reference numbers

1 Drive circuit

2 Actuator

3 Actuator

4 Vehicle door

5 Vehicle door

6 Closing position

7 Closing position

8 Opening position

9 Opening position

10 Opening position

11 Closing address

12 Drive shaft

13 zipper

14 Pressure chamber (closing direction)

15 Pressure chamber (opening direction)

16 Embolo

17 Cylinder unit

18 Branch duct branch

19 Branch

20 Opening duct branch

21 Branch

22 Manual operated valve

23 2/2 distributor valve

24 6 drive organ

25 Check Valve

26 Check Valve

27 Connection

28 Connection

29 Reversible pump

30 Drive Union

31 Electric drive module

32 Hydraulic tank

33 Control duct

34 Control duct

35 Union duct

36 Branch Point

37 Check Valve

38 Check Valve

39 Union duct

40 Valve

41 Pressure sensor

42 Multi-way valve

43 First entry

44 Second Entry

45 Departure

46 Automatic pressure increase switch

47 Regulation unit

48 Pressure sensor input connection

49 Electric conduit

50 Control output

51 Control duct

52

53

54

55

56

57

58

59

60

61

62

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64

65

66

67

68

69

70

71

Position sensor

Position sensor

Potentiometer

Potentiometer

Conduit

Conduit

Input connection Input connection Input Output

Drive circuit module

Connection

Connection

Connection

Connection

Regulation Module

Module

Interface

Control connection Input connection

Claims (14)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 60 65 1. Hydraulic drive circuit module (62) for opening and closing at least one vehicle door (4; 5), for example of a bus, with a) at least one hydraulic duct branch (closing duct branch 18; opening duct branch 20) that can be attached or is connected to a pressure chamber (14; 15) of a hydraulic actuator (2; 3), depending on the hydraulic request of the pressure chamber (4; 15) of the electrical request of an electric drive module (31) of a pump (29) and requesting the vehicle door (4; 5), due to the hydraulic request of the pressure chamber (14; 15), in an opening direction (10) or a closing direction (11), b) an electronic regulation unit (47) that has a control output (50), through which the number of revolutions of the electric drive module (31) can be regulated, c) with a first input connection (58; 59) of the electronic control unit (47), which can be attached or is connected to the position sensor (52; 53) to detect the position of the vehicle door ( Four. Five), d) a second input connection (71) of the electronic regulation unit (47), which is supplied with a signal corresponding to the electrical request of the electric drive module (31) of the pump (29), being treated of a current of the electric drive module, of a voltage or of an absorption of electric power of the electric drive module or of a magnitude correlated therewith, e) the control unit (47) being equipped with a control logic that ea) both based on the signal at the first input connection (58; 59) for the position sensor signal (52; 53) eb) as on the basis of the signal in the second input connection (71) corresponding to the electrical request of the electric drive module (31) of the pump (29) generates, adapts or regulates a control signal at the control output (50) for the regulation of the number of revolutions of the electric drive module (31) of the pump (29), characterized in that the control logic of the control unit regulation (47) determines an operational state of the vehicle door and / or performs an error analysis of the drive circuit module (62) and in this regard f) is properly configured to regulate the number of drive revolutions of the electric drive module (31) of the pump (29) depending on the signal at the second input connection (71) corresponding to the electrical request of the drive module (31) of the pump (29), fa) deducting, in case of a reduced electrical request of the drive module (31) of the pump (29), a leak or other defect and / or fb) deducting from an increased electrical request (29) of the drive module (31) of the pump (29) a resistance of the vehicle door (4, 5), the imprisonment of a person by the vehicle door (4, 5) or the scope of a final position and / or g) is properly configured to regulate the number of drive revolutions of the electric drive module (31) of the pump (29) both as a function of the output signal of the position sensor (52, 53) and as a function of the signal at the second input connection (71), which corresponds to the electrical request of the drive module (31) of the pump (29), ga) deducting, in case of an increased electrical request of the drive module (31) of the pump (29) and for an output signal from the position sensor (52, 53) indicating that the vehicle door (4, 5 ) is not in a final position, an imprisonment of a person or the crash of the vehicle door (4, 5) against an obstacle and / or gb) deducting, in case of a reduced electrical request of the drive module (31) of the pump (29) and for an output signal from the position sensor (52, 53) indicating that the vehicle door (4, 5 ) is not in a final position, a leak or other defect. 2. Drive circuit module (62) according to revindication 1, characterized in that a) the electronic regulation unit (47) has a third input connection (48) that can be attached or is connected to a pressure sensor (41) for detecting the pressure in the pressure chamber (14; 15), Y b) the regulation unit (47) is equipped with a control logic that ba) on the basis of the signal at the first input connection (58; 59) for the position sensor signal (52; 53), bb) on the basis of the signal at the second input connection (71) corresponding to the electrical request of the electric drive module (31) of the pump (29), and bc) on the basis of the signal at the third input connection (48) for the pressure sensor signal (41), it generates a control signal at the control output (50) for the regulation of the module speed of electric drive (31), determines an operational state of the vehicle door and / or performs an error analysis of the drive module (62). 5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 60 65 3. Drive circuit module (62) according to claims 1 or 2, characterized in that a) there is an opening duct branch (20) to which it can be connected or a pressure chamber (15) that acts in the opening direction (10) is connected, and b) there is a branch of the closing duct (18) to which it can be connected or a pressure chamber (14) that acts in the closing direction is connected. 4. Drive circuit module (62) according to claim 3, characterized in that between the opening duct branch (20) and the closing duct branch (18) the pump (29) can be intercalated or interleaved, and The regulation unit (47) produces at the control output (50) a control signal, whereby the electric drive module (31) of the pump (29) can be switched from a transport to the opening duct branch ( 20) to a transport to the branch of closing duct (18) and vice versa. 5. Drive circuit module (62) according to one of the preceding claims, characterized in that the hydraulic request of at least one duct branch (closing duct branch 18; opening duct branch 20) can be regulated by modification. of the number of drive revolutions of the electric drive module (31) of the pump (29). 6. Drive circuit module (62) according to one of claims 3 to 5, characterized in that between the opening duct branch (20) and the closing duct branch (18) is interleaved or a valve ( 40) which, according to the hydraulic request of the opening duct branch (20) and / or the closing duct branch (18), joins the pressure sensor (41) to the opening duct branch (20) or to the branch closing duct (18). 7. Drive circuit module (62) according to claim 6, characterized in that a) the valve (40) is a multi-way valve (42), whose aa) first inlet (43) is connected to the opening duct branch (20), ab) second inlet (44) is connected to the branch of the closing duct (18), ac) outlet (45) is connected to the pressure sensor (41) b) joining the multi-way valve (42) the outlet (45) to the inlet (43, 44) whose pressure is greater than the pressure at the other inlet (44, 43). 8. Drive circuit module (62) according to one of the preceding claims, characterized in that there is a manually operated valve (22) that can be operated manually and which in a manually induced emergency drive position joins the duct branch opening (20) to the branch of closing duct (18). 9. Drive circuit module (62) according to one of the preceding claims, characterized in that the pressure in the opening duct branch (20) and / or the pressure in the closing duct branch (18) is ensured to through an unlockable shut-off valve, especially an unlockable check valve (25, 26). 10. Drive circuit module (62) according to one of the preceding claims, characterized in that the position sensor (52, 53) is made with a potentiometer (54, 55) actuated according to the rotation of a rotating column or of a drive shaft (12) of the vehicle door (4, 5), which is part of the drive circuit module (62) and / or whose output signal can be supplied to the first input connection (58, 59) of the electronic regulation unit (47). 11. Drive circuit module (62) according to one of the preceding claims, characterized in that an actuator (2, 3) with at least one pressure chamber (14, 15) forms an integral part of the drive circuit module (62 ). 12. Drive circuit module (62) according to one of the preceding claims, characterized in that a) the electronic control unit control logic (47) is properly configured to regulate the number of drive revolutions of the electric drive module (31) of the pump (29) as a function of the sensor output signal position (52, 53) b) in which ba) the number of drive revolutions of the electric drive module (31) of the pump (29) decreases when the output signal of the position sensor (52, 53) indicates that an approximation to an end position of the door is produced vehicle (4, 5) bb) the number of drive revolutions of the electric drive module (31) of the pump (29) 10 fifteen twenty 25 it is reduced to zero when reaching a final position, bc) a predetermined dependence of the number of drive revolutions of the electric drive module (31) of the pump (29) and / or of the pressure is adjusted, with respect to the output signal of the position sensor (52, 53) , I bd) the number of drive revolutions of the electric drive module (31) of the pump (29) is modified to a default number of drive revolutions, when the output signal of the position sensor (52, 53) indicates that the position of the vehicle door (4, 5) is outside an end position, but a speed signal of the modification of the position of the vehicle door (4, 5) is below a threshold value or has A passage through zero. 13. Drive circuit module (62) according to one of the preceding claims, characterized in that a) the control logic of the electronic control unit (47) is properly configured to regulate the number of drive revolutions of the electric drive module (31) of the pump (29) as a function of the output signal of the pressure sensor (41), b) in which ba) in case of a pressure drop a leak or other type of defect is deduced and / or bb) in the event of an increase in pressure, a resistance of the vehicle door (4, 5) or the imprisonment of a person by the vehicle door (4, 5) or the reach of a final position is deduced. 14. Drive circuit module according to one of the preceding claims, characterized in that the control logic of the electronic control unit (47) is properly configured to perform, depending on the signal in the second input connection ( 71) which corresponds to the electrical request of the drive module (31) of the pump (29), a calibration of a pressure sensor and / or a function test of a pressure sensor.