Patent Application
20110010993
This application claims the priority, under 35 U.S.C. §119, of German application DE 10 2009 032 956.0, filed Jul. 14, 2009; the prior application is herewith incorporated by reference in its entirety.
The invention relates to a device for operating a closing part, driven by a drive, on a device of transportation. The device has a control apparatus which is assigned to the drive and is configured to actuate the drive in order to initiate a measure which is opposed to the movement of the closing part. The invention also relates to a method for operating a closing part, driven by the drive, on the device of transportation.
Published, non-prosecuted German patent application DE 10 2008 014 514 A1 discloses a method for operating a tailgate, which can be pivoted between two end positions by a hydraulic drive apparatus, of a vehicle. In order to prevent persons being put at risk by incorrect closure of the tailgate, during a period of interruption a control signal is generated which activates the drive apparatus to output a counter-pulse which counteracts a downward movement of the tailgate.
It is accordingly an object of the invention to provide a device and a method for operating a closing part on a device of transportation, driven by a drive, which overcome the above-mentioned disadvantages of the prior art methods and devices of this general type, in which a braking operation of a movement of the closing part is to be implemented with the lowest possible expenditure.
The device for operating the closing part, driven by a drive, on a device of transportation includes a control apparatus which is assigned to the drive. The control apparatus is configured to actuate the drive in order to initiate a measure which is opposed to the movement of the closing part. The drive is embodied as an electric or electromechanical drive. In this context, the drive can be actuated by the control apparatus in such a way that the drive becomes active in a braking fashion with respect to the movement of the closing part. The term “closing part” includes, in the wording of this text, in particular vehicle components such as, for example, a tailgate, an engine hood, a side door or a lift and slide sunroof, to name a selection.
In one embodiment variant of the invention, the device contains a short-circuit-generating device with which a short-circuit can be generated at the drive and/or at an electrical component which is operatively connected to the drive. The short-circuit ultimately gives rise to braking effectiveness of the drive. The short-circuit-generating device is structurally simple to construct and therefore constitutes an effective possible way of generating the braking effect. In terms of the implementation of an effect of the motor which brings about braking with respect to the movement of the closing part, other only conceivable solutions are also basically possible.
According to one embodiment of the invention, the short-circuit can be generated between the terminals of the drive (that is to say between the motor terminals) with the short-circuit-generating device.
In one embodiment variant of the invention, the control apparatus is assigned a decision device. The decision device decides, on the basis of predefined decision criteria, whether the drive will become active in a braking fashion. In this context, when there is a positive decision result, the control apparatus causes the drive to become active in a braking fashion with respect to the movement of the closing part. This makes it possible to provide comfortable and reliable operation of the device by use of situationally appropriate decisions.
In one embodiment of the invention, the device is assigned a sensor system for detecting the spatial position and/or the direction of movement of the closing part and a plausibility-checking device. The plausibility-checking device is used to check the plausibility and/or consistency of output signals which are supplied by the sensor system. The decision as to whether the drive becomes active in a braking fashion is taken with consideration of the plausibility-checking result.
In one embodiment variant of the invention, the control apparatus is configured to actuate the drive in dependence on a setpoint movement sequence plan which is stored in the control unit. The device is assigned a determining apparatus which is configured to determine a deviation of the actual movement sequence of the closing part from the setpoint movement sequence of the closing part. The control apparatus is configured to cause the drive to become active in a braking fashion with respect to the movement of the closing part when the deviation of the actual movement sequence of the closing part from the setpoint movement sequence of the closing part is determined. The deviation of the actual movement from the setpoint movement sequence is often due to an unintended movement of the closing part. Such an unintended movement can be caused by changed kinematic relationships which occur, for example, at the side door when the vehicle assumes an oblique position. Overall, the embodiment variant described last reduces the endangerment of persons which is associated with an unintended movement.
In one embodiment of the invention, the device has a warning apparatus with which an acoustic and/or optical and/or haptic warning signal can be output after the decision that the drive will become active in a braking fashion as a further safety precaution for protecting persons.
A significant advantage of the invention is the double use of an electric or electromechanical drive which is necessary in any case in the driving function, which constitutes a particularly effective possible way of implementing activation of the counter-pulse which counteracts the movement of the closing part.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a device and a method for operating a closing part, driven by a drive, on a device of transportation, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
The single FIGURE of the drawing is a flowchart of a method according to the invention for operating a tailgate which is provided on a motor vehicle.
The method is carried out with a non-illustrated device which contains the components which are described individually below:
The method firstly includes a determining step S1 in which data which relate to the setpoint movement sequence plan are stored and made available for later processing and/or evaluation in a data memory.
After the determining step S1, the method is continued in a first checking step P1 in which the plausibility-checking device is used to check the plausibility and/or consistency of output signals which are supplied by the sensor system.
If a positive plausibility-checking result is achieved in the checking step P1, the method is continued with a second checking step P2. In contrast, if a negative plausibility-checking result is achieved in the checking step P1, the method is continued with a short-circuit-generating step K.
In the short-circuit-generating step K, a short-circuit which brings about, or results in, the induction of an opposing force (Lorentz force) in the drive is generated between the terminals of the drive (that is to say between the motor terminals). This opposing force ultimately causes the movement of the tailgate to be slowed down.
In the second checking step P2 it is checked whether a deviation of the actual movement sequence of the tailgate from the setpoint movement sequence of the tailgate has occurred. If a positive checking result is achieved in the second checking step P2, the method is continued in the decision step E in which it is decided that the actuation of the drive remains unchanged.
However, if a negative checking result is achieved in the second checking step P2, the method is continued with the short-circuit-generating step K.
Of course, the method according to the invention is used in particular for monitoring an unintended movement of the tailgate, of a side door or of any other closing part in the direction of closing thereof because here there is the risk of a person's body part being trapped.
“Direction of closing” is to be understood in the wording of this text as meaning the direction of movement of the closing part in which the latter is moved out of an open position, in which the closing part at least partially clears an opening, in order to close the opening.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2009 032 956.0 | Jul 2009 | DE | national |
