DE10110884B4 - An actuation system comprising a piston-cylinder unit in combination with a drive device - Google Patents

Abstract

An actuating system comprising a base part and a part to be moved, the base part having drive means stealing in operative connection with the part to be moved, a control system monitoring the movement of the part to be moved and detecting an obstacle when a parameter representing movement is detected deviates from a stored parameter above a threshold, characterized in that a sensor (25) detects the rotational speed of a moving part at a reference measuring point, the control system (29) forming a differential of the rotational speed at a time, the differential being in a comparison unit (31). is compared with a differential value corresponding to a measuring point on a moving distance of the movable part, wherein a deviation between the measured differential and the associated stored value above a threshold, an obstacle is detected and the movable part (3) with a lock (27) engages in such a way that a movement of the moving part during the lock movement runs with discontinuities and that the obstacle detection on ...

Description

The The invention relates to an actuating system according to the preamble of claim 1.

From the DE 196 49 698 A1 a control device for a powered barrier is known, wherein the control device for flaps or doors are provided in a motor vehicle. The control device comprises inter alia a piston-cylinder unit which exerts an opening force on a tailgate or a vehicle door. Furthermore, a drive unit in the form of an electric motor in conjunction with a cable device ensures a closing movement of the tailgate or the vehicle door.

component the control device is an obstacle detection, the anti-trap offers. Therefore the force or the current of the electric motor is sensed and with Records the movement of the vehicle door or the tailgate compared. The movement is based on parameters of absolute closing force and u. a. also after the derivation of the closing force in relation to the time saved.

The DE 40 36 900 A1 describes a drivable swivel joint for flaps or motor vehicle doors. The swivel joint has an electric motor which acts directly or on a Schwenkhebei and causes an opening and closing movement of the flap. Possibly. It is possible to use an intermediate gearbox and an overload clutch, for example to adapt a standard engine to the installation situation.

From the DE 41 27 047 A1 a circuit arrangement for monitoring of electric motor driven cover elements when closing openings to ensure a pinch protection is known. By sensors current engine speed of the drive motor are detected and compared this actual value with a characteristic setpoint. If there is a difference between these values, a shutdown takes place.

From the DE 41 24 869 A1 a device for motor- and power-operated moving a flap, in particular a tailgate for motor vehicles is known in which a drive motor acts via a gear and an overload clutch on a force-assisted by a weight compensating spring adjustment.

From the DE 39 00 508 C2 is a pull-down mechanism for a compartment panel, which is connected via hinges to a vehicle body and can be moved by an electric motor to a designated by a body panel between open and closed positions known. The actual motor current is compared with a reference voltage. If the motor current exceeds the reference voltage, the motor current is interrupted.

task the present invention, a piston-cylinder unit in conjunction with a drive device for ease of operation and realize a low installation cost.

These Task is in a generic actuation system according to the invention thereby solved, a sensor detects the rotational speed of a moving part at a reference measuring point detected, wherein the control system is a differential of the speed currently forms, with the differential in a comparison unit is compared with a differential value corresponding to a measuring point corresponds to a moving distance of the movable part, wherein at a deviation between the measured differential and the associated stored value above a threshold detected an obstacle is and the movable part with a lock in operative connection occurs that one Movement of the moving part during the castle movement with discontinuities expires and that the Obstacle detection on a movement area outside a lock movement limited is.

advantageous Embodiments of the invention are specified in the subclaims.

at a deviation between the measured differential and the associated stored Value above a threshold, an obstacle is detected.

Of the Advantage of the speed measurement is that an obstacle on the moving part immediately and not as in a force measurement the drive unit is detected as aftereffect.

The Fold lock movement runs along Discrepancies that are handled only with excessive effort can. The probability that in the short range of movement of the lock movement an obstacle occurs is negligible.

In Another advantageous embodiment of the sensor as a rotary potentiometer accomplished is. The moving part, flap or door in a motor vehicle, leads one Turning, which also with a relatively simple rotary potentiometer can be sensed with sufficient accuracy.

Every door or flap is subject within limits to individual influences that determine the speed of door or flap movement. For example game, the hinges can have different degrees of friction. Even springs that move a tailgate in the opening direction are subject to force tolerances. Another important parameter when using a gas spring is the ambient temperature. To exclude all these influences, the stored values which describe an obstacle-free movement of the part to be moved are determined by a teach-in mode.

at an embodiment a cable device is attached to the part to be moved, wherein the Cable device starting from a winding device via a Pulley on a piston-cylinder unit to an attachment point is guided, so that the cable device forms a pulley. It can be one Drive device can be used, the only low drive power must muster.

In Another embodiment, a rope of the cable device starting from the winding device to the deflection roller on a cable guide and an attachment point of the rope is arranged on the cable guide. This allows the cable device directly to the piston-cylinder unit be arranged without fasteners on the vehicle are necessary. The mounting effort on the vehicle is similar to a low conventional piston-cylinder unit.

In order to the part to be moved is not blocked in the event of a power failure is, the drive means comprises an electromagnetically operated clutch open on power failure is.

To the drive device is a spring store connected in parallel, which drives the winding device in case of failure of the drive device. It prevents, for example, during power failure and a closing movement a flap, the rope of the rope device uncontrolled in the vehicle is located and possibly involved with cargo in the trunk.

Of another is provided that the rope of the rope device within a rope cover led to the piston-cylinder unit is, the shell the piston-cylinder unit at least on the length of the Includes rope on the piston-cylinder unit. For one thing you want the Rope device and to other persons in the vicinity of the operating rope device protect.

To the shell exists from at least one telescopic protective tube.

Around a protective tube with a small diameter and one possible parallel cable guide To realize the piston-cylinder unit comprises the cable means a first cable guide element on a connecting element the piston rod and a second cable guide element on the cylinder of the piston-cylinder unit.

In Another embodiment, the cable guide elements as a ring bearing executed that of the connecting organ is being held. The ring bearings allow a movement of the connection point of the rope in the circumferential direction, so no extra Tensions or changes in length occur during the operating movement of the piston-cylinder unit.

According to one Advantageous subclaim, the drive unit has a cable tension sensing device whose signal is forwarded to the clutch. At a normal operation must be the rope tension always in a specific operating range. We this operating area leave, so you can provide further measures to a the normal operation to produce close-fitting operation of the cable device.

Around the Sensieraufwand possible to keep low, the signal is the Seilspannungssensiereinrichtung as a 0-1 signal.

at Signal 0 the Seilspannungssensiereinrichtung the clutch is opened. you can imagine an open tailgate closed shall be. The user presses additionally to the drive device that closes the flap. The rope tension drops off and the rope could again unchecked lie in the trunk. With the clutch open the spring accumulator ensures a driving force of the winding device, so that a secure winding is present.

Around the design effort for the Seilspannungssensiereinrichtung to keep low, there is the Seilspannungssensiereinrichtung of a switch, by the Relative movement of the rope is actuated to a cable sheath.

Of Furthermore, it is provided that the actuating system has an elastic Moving buffer having a phase shift of the drive movement the drive means for real movement of the movable part allows. It's supposed to hit the moving part hard against an obstacle be avoided. In addition to the drive device is less loaded when an obstacle occured.

Of the Sensor used to detect the movement of the part is between arranged the elastic movement buffer and the movable part. This allows the drive unit to operate without delay through the buffer be.

In a first embodiment is the elastic movement buffer part of the piston-cylinder unit and at a relative movement of a terminal member part of the piston-cylinder unit a reference point of the piston-cylinder unit is the sensor generates an obstacle signal.

To the motion buffer consists of a measuring body in conjunction with a Meßbezugseinrichtung, wherein the measuring body at an impact of the movable part on an obstacle relative movement to Meßbezugseinrichtung performs.

Of the measuring body and the measuring reference device are designed as limit switches.

When further consequences to simplify the actuation system the drive device and the control system are arranged in a common housing.

Especially for the Variant of the directly connected drive unit has this a transmission, wherein in the power flow of the transmission, an elastic transmission element is arranged.

in the In terms of comfort is over a remote control a lock for the component to be moved switchable, with the same trigger signal the drive unit is controlled.

there is with a tip trigger on the remote control for the drive device connected to a continuous signal, a maximum of one Final position of the moving part, an obstacle or a new tip triggering exists. It comes with a simple one-button remote control.

embodiments The invention will be explained in more detail with reference to the drawing.

It shows:

1 Actuation system in a schematic diagram

2 Actuation system with cable device as pulley

3 Rope tension censor as detail

4 Piston-cylinder unit in a shell

5 Cable guide in a piston-cylinder unit according to 1

6 Embodiment of a movement buffer on the piston-cylinder unit

7 - 9 Drive unit connected directly to the flap

The 1 shows a schematic diagram of a motor vehicle with a body as the base part 1 and a moving part 3 in the execution of a tailgate, hereinafter referred to only flap, as it is also a front hood, a 5 Vehicle door or appropriate use cases can act.

The flap 5 is in a transverse axis to the vehicle 5 stored. At least one piston-cylinder unit 7 practice the flap 3 a force in the opening direction. The piston-cylinder unit is preferably a gas spring, which optionally has an end position damping. The piston-cylinder unit is connected via connecting elements 9 ; 11 attached to the base part and to the flap. The main components of the piston-cylinder unit are a cylinder 13 and a piston rod 15 shown. For example, a piston-cylinder unit after the DE 29 50 888 A1 or the DE 33 01 544 A1 be used.

The closing movement of the flap takes over an actuating system 15 , which is a drive device 17 includes. This drive device is connected via a cable device 19 with the flap 3 in active connection. Is the drive unit via a remote control 21 initiated, then drives the drive unit a winding device 23 (S. 2 ), so that the flap is moved against the force of the piston-cylinder unit in the closing direction. The remote control is equipped with a tip trigger that is connected to a continuous signal until an end position, a new tip trigger to stop the flap or an obstacle is present. Therefore, the tip release requires only one button.

A sensor 25 , preferably a rotary potentiometer, senses the flap movement up to an angular range at which a flap lock 27 locks. You can use the sensor 25 on the axis 5 , the connecting organs 9 ; 11 or arrange in the area of the drive device. When you first press the flap stores a control system 29 Measuring points that represent the movement of the flap. These measuring points are angles of the flap position in conjunction with the instantaneous speed of the sensor. The control system determines the differential from instantaneous speed with respect to time and can be done by using a comparison unit 31 Discrepancies, that is to say, excessive changes in the increase. An increase change above a threshold value is to be influenced by an obstacle, not shown. 5 He becomes an obstacle knows, there is a possibility that the flap is opened by reversing the direction of rotation of the drive device again.

Of the dwell the flap in the engagement area of the flap lock is not sensed, because in this angular range larger discontinuities are present in the flap movement, which only with a disproportionate effort let filter out.

The 2 shows in particular the drive device 17 next to an electric motor 33 an electromagnetically switchable coupling 35 having. The coupling is at least one gear stage 37 downstream, in turn, the winding device 23 for the rope device 19 drives. The winding device is a spring accumulator 39 attached, which drives the winding device in the winding direction with the clutch open. The spring accumulator may, for example, be a helical spring.

The rope device 19 on the piston-cylinder unit 7 is in the 2 optional different from the 1 executed. In the embodiment according to the 2 becomes a rope guide 41 used, on the one hand a cable sheath 43 the rope device 19 supports and an attachment point 45 for a rope running inside the rope sheath. Starting from the cable sheath, the rope runs 47 via a pulley 49 , which is in operative connection with the cylinder 13 stands, to the attachment point 43 so that the rope forms a pulley.

As can be seen from the pictorial representation, the cable sheath runs between an entrance part 51 the winding device 23 and the rope guide in a bow. If the rope is wound, it inevitably leads to a tensioning movement in the cable sheath, whereby the cable sheath is supported in each case with their En-the front part and the cable guide. This effect is for a cable tension sensing device 53 exploited within the entrance section 51 is arranged.

The 3 shows the Seilspannungssensiereinrichtung in a schematic diagram. The rope cover 43 becomes end of a spring 55 against the rope guide 41 ( 2 ). In one by the drive device 17 performed closing movement of the flap or a winding operation of the rope 45 the cable sheath is biased, with both ends of the cable guide and the input part abut. The spring force of the spring 55 is overcome, leaving a switch 57 gets no contact. This switch gives a 0-1 signal to the control system 27 for a signal 0, if the switch is not making contact, the clutch 35 opens, leaving the spring store 39 the winding device drives.

The 4 shows a piston-cylinder unit 7 according to the 1 in which the rope 47 together with the cylinder 13 and the piston rod 15 from a shell 59 is included. As a rule, aggregates in the application are not particularly protected with a flap, since the attachment provides sufficient protection against external influences such as moisture or dirt. 20 The case 59 consisting of two telescopic protective tubes 59a ; 5915 is intended to protect the rope and the users, so that no damage or injury occurs.

The 5 represents a section of the piston-cylinder unit 7 according to the 1 dar. With the connecting element 9 is the rope guide 41 on the vehicle body 3 attached. The connecting element 9 itself can rest on a mounting sleeve 61 move and is not with the rope guide 41 braced in the axial direction of the mounting sleeve. A fixing screw 63 holds the mounting sleeve 61 stuck to the vehicle body. So that the rope guide 41 by the supporting force of the cable sheath 43 can not twist, the through hole for the mounting sleeve is designed with a square profile. Of course, the profile can also be designed differently. At the connection organ 11 becomes a ring bearing 65 inserted, located on the mounting sleeve 61 twist with a light play and thus align the rope guide.

The 6a shows a variant of the terminal bearing 11 that has an elastic motion buffer 67 having. Inside a sensor housing 69 , which is firmly connected to the terminal bearing is a measuring body 71 axially displaceable to the piston rod 15 displaceable up to a free travel s. A measuring reference device 73 provides in conjunction with the measuring body, a signal when a phase shift between the terminal member 11 including sensor housing relative to the piston rod 15 is present. At the piston rod 15 is the ring bearing 65 for the rope device 19 fixed axially.

If with the rope device over the ring bearing 65 on the piston rod 15 is pulled, must at a trouble-free movement of the attached to the connecting member flap 3 there is a constant contact between the measuring body and the upper bottom of the sensor housing. The free travel s remains constant.

If an obstacle occurs, the piston rod, together with the measuring body attached to the piston rod, becomes detached from the cable device 19 continue towards the cylinder 13 pulled, however, the flap and the connecting member is held with the measuring body of the obstacle. The measuring body and the measuring reference device perform a relative movement, wherein the measuring body thereby maximum travels the free travel s. If the measuring body and the measuring reference device are, for example, a capacitive sensor, then an obstacle can be detected steplessly.

You can also do a simple limit switch 75 use that only provides a simple 0-1 signal to the clutch 35 represents a closing or opening signal. If an obstacle is detected via the elastic motion buffer, then without computation procedures, such as 1 described, the clutch will be opened immediately. Due to the extension force of the piston-cylinder unit, the flap is opened immediately by the measuring body on the sensor housing below the connecting member 11 abuts and transmits a compressive force.

The 7 . 8th and 9 represent an actuation system that directly with the flap 3 connected is. The drive device 17 includes two parallel holding plates 77 ; 79 , taking on the holding plate 79 the electric motor 33 is attached. A drive shaft 81 is with the clutch 35 connected, the output side of a first gear 83 wearing. The first gear 83 engages a second larger gear 85 on an intermediate shaft 87 , The intermediate shaft 87 has a third gear 89 but which has no torque connection to the intermediate shaft. The third gear 89 engages axially in the second gear 85 on the principle of a dog clutch. For this purpose, the third gear has not shown axially extending segments. Between the second and the third gear is the elastic movement buffer 67 performed by using an elastic transmission element 91 a limited relative movement between the second and the third gear 85 ; 89 is possible.

The third gear 89 again is smaller than a meshing gear segment 93 that is fixed to an output shaft 95 connected is. You can use a gear segment for the output shaft, since the output shaft performs only a movement corresponding to the opening angle of the flap. The output shaft in turn is in a mounting plate 97 mounted, which in turn is connected to the vehicle body and as a torque support for the drive device 17 acts. At the end of the drive shaft is an actuating lever 99 arranged directly or with the interposition of a lever linkage on the flap 3 attacks.

The drive device can close the door and open, where for the 30 Opening movement an unillustrated piston-cylinder unit is connected in parallel. In order to use as little energy as possible in the actuation system, it makes sense to the opening movement of the drive system 17 Restrict to only a portion of the opening angle of the flap until the piston-cylinder unit due to the articulation points of the connecting members a sufficiently large lever arm to the flap is available that the piston-cylinder unit can perform the opening movement of its own power.

The 9 discloses a mounting location for the sensor 25 in the area of the drive device 17 , The third gear 98 on the intermediate shaft 87 drives the sensor 25 at. By this measure, a spread of the measuring tape of the sensor can be achieved, whereby a finer measurement of the rotational movement in the 10 View of obstacle detection is possible.

Claims (24)

An actuating system comprising a base part and a part to be moved, the base part having drive means stealing in operative connection with the part to be moved, a control system monitoring the movement of the part to be moved and detecting an obstacle when a parameter representing movement is detected deviates from a stored parameter above a threshold, characterized in that a sensor ( 25 ) detects the rotational speed of a moving part at a reference measuring point, wherein the control system ( 29 ) forms a differential of the speed at a time, wherein the differential in a comparison unit ( 31 ) is compared with a differential value corresponding to a measuring point on a moving distance of the movable part, wherein a deviation between the measured differential and the associated stored value above a threshold value, an obstacle is detected and the movable part ( 3 ) with a lock ( 27 ) is operatively connected in such a way that movement of the moving part takes place during the lock movement with discontinuities and that the obstacle detection is limited to a range of movement outside a lock movement. Actuating system according to claim 1, characterized in that the sensor ( 25 ) is designed as a rotary potentiometer. actuating system according to claim 1, characterized in that the stored Values are determined by a teach-in mode. Actuating system according to one of claims 1 to 3, characterized in that a cable device ( 19 ) on the part to be moved ( 3 ), wherein the cable device starting from a winding device ( 23 ) via a deflection roller ( 49 ) on a piston-cylinder unit ( 7 ) to a Be fixing point ( 45 ) is guided, so that the cable device forms a pulley. Actuating system according to claim 4, characterized in that a rope ( 47 ) of the cable device ( 19 ) starting from the winding device ( 23 ) to the pulley ( 49 ) a cable guide ( 41 ) and an attachment point ( 45 ) of the rope ( 47 ) on the cable guide ( 41 ) is arranged. Actuating system according to one of claims 1-5, characterized in that the drive device ( 17 ) an electromagnetically switched clutch ( 35 ), which is open in the event of a power failure. Acting system according to one of claims 1 to 6, characterized in that the drive device ( 17 ) a spring store ( 39 ) is connected in parallel, which in case of failure of the drive device ( 17 ) the winding device ( 23 ) drives. Betägigungssystem according to claims 1 to 7, characterized in that the rope ( 47 ) of the cable device ( 19 ) within a shell ( 59 ) to the piston-cylinder unit ( 7 ), the envelope ( 59 ) the piston-cylinder unit ( 7 ) at least along the length of the rope on the piston-cylinder unit includes. Actuating system according to claim 8, characterized in that the envelope ( 59 ) of at least one telescopic protective tube ( 59a ; 59b ) consists. Betätigungssernern according to one of claims 1 to 9, characterized in that the cable device ( 19 ) a first cable guide element ( 65 ) at a connecting element ( 11 ) of the piston rod ( 15 ) and a second cable guide element ( 41 ) on the cylinder ( 13 ) of the piston-cylinder unit ( 7 ). Betätigungssystern according to claim 10, characterized in that the cable guide element ( 65 ) is designed as a ring bearing, of the connecting member ( 11 ) is held. Actuating system according to one of claims 1 to 11, characterized in that the drive unit ( 17 ) a cable tension sensing device ( 55 ; 57 ) whose signal to the clutch ( 35 ) is forwarded. Betigungssystem according to claim 12, characterized in that the signal of the cable tension sensing device ( 55 ; 57 ) is present as a 0-1 signal. Betägigungssystem according to claim 13, characterized in that at signal 0 of the cable tension sensing device ( 55 . 57 ) the coupling ( 35 ) is opened. Betigungssystem according to claim 12, characterized in that the Seilspannungssensiereinrichtung from a switch ( 57 ) caused by the relative movement of the rope ( 47 ) to a cable sheath ( 43 ) is pressed. Acting system according to one of claims 1 to 15, characterized in that the actuating system ( 15 ) an elastic motion buffer ( 67 ), which is a phase shift of the drive movement of the drive device ( 17 ) for real movement of the moving part ( 3 ). Actuating system according to claim 16, characterized in that one for detecting the movement of the part ( 3 ) inserted sensor ( 25 ; 71 ; 73 ) between the elastic motion buffer ( 67 ) and the movable part ( 3 ) is arranged. Actuating system according to claim 16, characterized in that the elastic movement buffer ( 67 ) Part of the piston-cylinder unit ( 7 ) and in a relative movement of a terminal member part ( 11 ) of the piston-cylinder assembly to a reference point of the piston-cylinder assembly of the sensor ( 71 ; 73 ) an obstacle signal is generated. Actuating system according to claim 16, characterized in that the motion buffer ( 67 ) from a measuring body ( 71 ) in conjunction with a measuring reference device ( 73 ), wherein the measuring body at an impact of the movable part ( 3 ) performs a relative movement to the measuring reference device on an obstacle. Actuating system according to claim 19, characterized in that the measuring body ( 71 ) and the measuring reference device ( 73 ) as limit switch ( 75 ) are executed. Actuating system according to claims 1 to 20, characterized in that the drive device ( 17 ) and the control system ( 29 ) are arranged in a common housing. Actuating system according to one of claims 1 to 20, characterized in that the drive device ( 17 ) a gearbox ( 83 ; 85 ; 89 ; 93 ), wherein in the power flow of the transmission, an elastic transmission element ( 91 ) is arranged. Actuating system according to one of claims 1 to 22, characterized in that via a remote control ( 21 ) the castle ( 27 ) for that too moving component ( 3 ) is switchable, wherein with the same trigger signal, the drive unit ( 17 ) is driven. Actuating system according to claim 23, characterized in that with a tip release on the remote control ( 21 ) for the drive device ( 17 ) is connected to a continuous signal, maximum to an end position of the moving part ( 3 ), an obstacle or a new tip trigger.