DE102016200830B4 - Method and device for fault detection of an angle detection device on a door of a motor vehicle - Google Patents

Abstract

Method for error detection of an angle detection device (2) on a door (51) of a motor vehicle (50), comprising the following steps: detecting a binary state (60, 61) of the door (51) by a closing sensor (3), detecting an opening angle ( 30) of the door (51) by the angle detecting means (2), detecting an angle signal (20) output from the angle detecting means (2) by a controller (4) when a binary "closed" state (61) is present, characterized in that the detected angle signal (20) is compared to a predetermined safety angle (21) by the controller (4), wherein a warning signal (22) is output by the controller (4) if the magnitude of the detected angle signal (20) is greater than or equal to the predetermined safety angle (21).

Description

The invention relates to a method and a device for fault detection of an angle detection device on a door of a motor vehicle.

Modern motor vehicles have a variety of assistance systems, which increase the comfort and safety of the driver and the motor vehicle. Such an assistance system is, for example, an obstacle brake which prevents a collision of a door opened by the driver or another passenger with an obstacle present in the opening radius of the door by braking the door in time before the obstacle. This prevents damage to the motor vehicle and the obstacle.

From the DE 20 2005 020 086 U1 is a drive arrangement known for the motorized adjustment of a flap of a motor vehicle between an open position and a closed position. The flap is adjusted by means of a drive controlled by a flap control. When adjusting the flap in a predetermined adjustment position, the flap controller receives an adjustment signal and makes an adjustment of the control of the drive to the actual flap position.

From the DE 20 2011 104 636 U1 a locking device for a motor vehicle door unit is known, with a motion transmission member and a friction element with associated spring, wherein the friction element interacts with the motion transmitting member in accordance with an actuator, wherein the spring surrounds the motion transmitting member with predetermined by the actuator movement and thereby translational movements of the Motion transmission member allows or prevents. Furthermore, a sensor is described, which detects a travel of the motion transmission member.

From the DE 10 2012 018 093 A1 there is known a motor vehicle door and a method for acting on said motor vehicle door in the sense of braking / locking or pulling / opening. The motor vehicle door is equipped with a door leaf with drive, also a magnetic device as part of the drive and finally at least one sensor associated with the door leaf. Depending on a speed and / or position of the door leaf determined with the aid of the sensor, the magnetic device is energized by a control unit for selectively braking, holding, closing or opening the door leaf in relation to a motor vehicle body. From the WO 2015/048876 A1 For example, a vehicle door control system for a vehicle having a vehicle body and a vehicle door is known. The vehicle door control system includes a lock arm having one end fixed to either the vehicle body or the vehicle door, a lock arm holder having an area respectively attached to the vehicle body or the vehicle door, and a controller. The locking arm holder is designed to exert at least three different braking forces on the locking arm. The controller is further programmed to control the operation of the lock arm holder based on an input signal from at least one sensor.

In the course of several openings and closings of the door, it may happen that due to wear or other malfunctions detected by a sensor opening angle is no longer consistent with the real opening angle of the door.

The invention is therefore based on the problem of providing a method and a device for detecting an error of an angle detection device on a door of a motor vehicle.

The technical problem is solved by a method with the features of claim 1 and a device having the features of claim 6. Advantageous embodiments of the invention will become apparent from the dependent claims.

In the following, a safety angle shall be an angle which is set as a safety area around a measured value of an opening angle of a door. Depending on the direction of movement of the door, the safety angle is added or subtracted accordingly. If the safety angle is 2 °, for example, and if the door is braked at an opening angle of 10 ° in the case of a door opening, braking is already started at an opening angle of 8 °. In the opposite case, that is, when closing the door, the safety angle is deducted accordingly. If braking is to be carried out again at an opening angle of 10 °, braking is already started at an opening angle of 12 °. The safety angle may be symmetrical or asymmetrical with respect to a direction of movement of the door. In principle, the safety angle can also be zero or a braking of the door generally only in one direction, for example, only when opening done.

In particular, there is provided a method for detecting an error of an angle detecting device on a door of a motor vehicle, comprising the steps of: detecting a binary state of the door by a closing sensor, detecting an opening angle of the door by the angle detecting device, detecting one of Angle detecting means output angle signal by a controller when a binary state is "closed", wherein the detected angle signal is compared with a predetermined safety angle by the controller, wherein a warning signal is output by the controller, when the amount of the detected angle signal is greater than or equal to predetermined safety angle is.

Furthermore, a device is provided in a motor vehicle for fault detection of an angle detection device on a door of the motor vehicle, comprising at least one closing sensor for detecting a binary state of the door, at least one angle detection device for detecting an opening angle of the door, a controller, wherein the controller is designed to detect in the binary state "closed" an angle signal output by the angle detector, the controller being further adapted to compare the detected angle signal with a predetermined safety angle and output a warning signal if the magnitude of the detected angle signal is greater than or equal to the predetermined one Safety angle is.

Ideally, the opening angle measured by the angle detection device and output as an angle signal should always be zero in the closed state of the door. If, however, an angular error occurs in the course of repeated openings and closings of the door, the value measured by the angle detection device will shift by the error. Such an angle error can arise, for example, due to wear and abrasion of used components of the angle detection device or those which are connected to the angle detection device for angle measurement. In particular, moving components are exposed to progressive wear. Such wear can then lead, for example, to a systematic error in determining the opening angle of the door. Likewise, the case may occur that movable parts of the angle detection device, for example a rubber roller rolling on a tether for angle measurement, block partially or completely. In addition, a reduction in the rolling friction of such a rubber roller due to physical influences (e.g., icing of the tether or roller surface) or chemical influences (e.g., wetting of a contact point between the rubber roller and tether with fats or oils) may result in erroneous angle measurement.

The core idea of the invention is to detect the angle signal output by the angle detector each time the door is closed. Since the opening angle of the door is fixed (ie equal to zero) in the closed state of the door and is detected by a separate closing sensor with only two states, a reliable reference value is thus available in this state. The angle signal output by the angle detection device in the closed state of the door then corresponds to the existing angle error. The error angle determined in this way is then compared by the controller with a safety angle, wherein a warning signal is output, for example, if an absolute value of the error angle exceeds the safety angle. As a safety angle, for example, a value of 2 ° can be selected. If the absolute error angle remains below this value, no warning signal is output. On the other hand, if the absolute error angle exceeds 2 °, a warning signal is output. In principle, a direction of the deviation can additionally be distinguished. Thus, an opening angle of the door which is too large to avoid a collision with an obstacle is more tolerable than an opening angle which is too small. There is thus a method and a device available with which the angle error can be regularly checked and monitored.

In one embodiment, it is provided that the warning signal is output at a human-machine interface. For this purpose, the device comprises a human-machine interface. The human-machine interface can be perceived as visually perceptible, acoustically perceptible or perceptible to the touch.

In a further embodiment it is provided that the human-machine interface comprises a display device and the controller is designed to output the warning signal to the display device in the form of a visually perceptible signal and / or to store consecutively detected angle signals, to compare with each other and one to issue a predictive maintenance recommendation when an absolute value of successively detected angle signals increases by a predetermined amount.

The visually perceptible signal can be displayed, for example, via an LCD display, an LED display or similar display devices in the motor vehicle. Also, a representation of the warning signal and / or the predictive maintenance recommendation via a display device of an on-board computer or an interactive multimedia display and control device is possible.

The successively detected angle signals are stored for example in a memory. For example, a time trend can then be determined on the basis of the stored angle signals become. If the stored angle signals change by an absolute value that exceeds a certain predetermined amount or the trend has a certain slope, it can be assumed that the angle error will soon exceed the safety angle. Accordingly, the maintenance recommendation will be issued. Of course, the maintenance recommendation can also be issued together with the warning signal when the safety angle is exceeded.

The values of the successively detected angle signals can be evaluated, for example, with respect to their temporal evolution. If the absolute values of the consecutively detected angle signals increase over time, it is possible to conclude on a future development, for example due to a progressive wear of the angle detection device. Accordingly, upon detection of a trend in the values of the detected angle signals, a maintenance recommendation can be issued.

In a further embodiment, it is provided that in the binary state "opened", an opening angle of the door detected by the angle detection device after detection of the angle signal is corrected by a correction device by a value of the detected angle signal and / or the predetermined safety angle is adjusted. This allows flexible adaptation of the specific opening angle to an angle error currently determined from the detected angle signal. Thus, parallel to a monitoring of the angular error, an opening angle of the door can always best be determined or estimated and provided.

If, for example, there is a systematic angle error of + 1.5 °, ie the angle detection device always provides an angle signal which is proportional to a too large opening angle, then the correction device can correct a detected opening angle of the door by this value. Obstacle braking may then respond to obstacles in the opening radius of the door based on the corrected opening angle.

If the specific error angle exceeds the safety angle, then it is also possible to adjust the safety angle itself and to extend the safety range beyond that. As a result, braking of the door of the motor vehicle commences earlier accordingly. A safe operation of an obstacle braking is then still possible with an increased safety angle.

In one embodiment it is provided that the device comprises a rubber roller and a holding band, wherein the rubber roller and the holding band are arranged on the door of the motor vehicle, that the rubber roller rolls on opening and closing the door on the tether and wherein the angle detecting means with the rubber roller is connected, that on the movement of the rubber roller along the tether the opening angle of the door can be detected and determined. An angle error determined for this embodiment can then be used, for example, as an indicator of wear of the rubber roller and / or of the holding strap. Thus, a diameter of the rubber roller will be reduced by progressive abrasion, resulting in a systematic error. A loss of frictional engagement between the rubber roller and the tether, blockage of the rubber roller, and systematic slippage can also be detected via the error angle.

Parts of the device can also be designed, individually or combined, as a combination of hardware and software, for example as program code that is executed on a microcontroller or microprocessor.

The invention will be explained in more detail with reference to preferred embodiments with reference to the figures. Hereby show:

1 a schematic representation of an embodiment of a device for error detection of an angle detection device on a door of a motor vehicle;

2 a schematic representation of an angle detection device for a door of a motor vehicle;

3 a schematic flow diagram of a method for error detection of an angle detection device on a door of a motor vehicle.

1 shows a schematic representation of an embodiment of a device 1 for error detection of an angle detection device 2 at a door 51 of a motor vehicle 50 , The device 1 includes the angle detection device 2 , a closing sensor 3 , a controller 4 and a human-machine interface 5 which is a display device 6 having. The device 1 may also have an interface 7 exhibit.

The closing sensor 3 is so at the door 51 of the motor vehicle 50 positioned that of the closing sensor 3 a binary state of the door, "opened" 60 or "closed" 61 , can capture. The closing sensor 3 For example, it can be designed as a simple pushbutton, the pushbutton being "closed" in the binary state. 61 pressed, when binary state "open" 60 however, is not pressed. In principle, the binary state by means of But also other buttons are detected around, so that a pressed button the state "open" 60 and a button not pressed the state "closed" 61 equivalent.

The angle detection device 2 detects an opening angle 30 the door 51 of the motor vehicle 52 and gives you the opening angle 30 corresponding value as angle signal 20 out. The opening angle 30 For example, it can be detected by a rubber roller rolling along a tether (see 2 ) and detecting a the opening angle 30 proportional rotation angle.

Captures the closing sensor 3 the binary state "closed" 61 so this will be from the controller 4 recognized. The control 4 then captures one in this binary state 61 from the angle detection device 2 output angle signal 20 and compares it with a given safety angle 21 , The default safety angle 21 may for example be 2 °, but can also be chosen differently. Exceeds the output angle signal 20 the safety angle 21 so gives the controller 4 a warning signal 22 via the display device 6 the man-machine interface 5 out. The man-machine interface 5 For example, the display device 6 an on-board computer of the motor vehicle 50 or a multimedia display operator of the motor vehicle 50 be. In addition to an output of the warning signal 22 as a visually perceptible signal 24 It is also possible to output an acoustic or haptic detectable signal. Furthermore, the controller 4 the warning signal 22 also at the interface 7 issued, leaving another electronics 11 of the motor vehicle 50 can access it.

Furthermore, it can be provided that the controller 4 a memory 10 having successive output angular signals 20 the angle detection device 2 through the controller 4 in the store 10 be deposited and from the controller 4 in an evaluation device 13 a trend analysis is made. If, for example, with repeated detection, that is to say over time or over a plurality of door openings and door closures, the output angle signal increases 20 although a currently detected angle signal 20 the safety angle 21 not yet exceeded, so can a message 23 issued with a request for a workshop visit, or the message can be stored in a log file of an onboard computer of the motor vehicle, so that a mechanic has access to it in a future workshop visit.

The device 1 can be a correction device 12 include. The correction device 12 is designed in the binary state "open" 60 on after detecting the angle signal 20 through the angle detection device 2 detected opening angle 30 the door 51 by a value of the detected angle signal 20 to correct. A through the correction device 12 corrected opening angle 31 can then, for example, via the interface 7 the other electronics 11 of the motor vehicle 50 to provide. Due to the corrected opening angle 31 the door 51 For example, a collision avoidance device for avoiding collisions of the door 51 with obstacles in the opening radius of the door 51 always with the best possible value for the opening angle 30 work. Even a faulty measurement caused by wear or a systematic error can be corrected in this way.

2 shows a schematic representation of an angle detection device 2 and their arrangement on a door of a motor vehicle. Door attachments are shown from the door 52 and a column attachment 53 , At the column attachment 53 is one end of a tie 54 attached. On the tether 54 is a rubber roller 55 arranged such that the rubber roller 55 when opening and closing the door along the tether 54 rolls along. The when opening or closing the door by the rubber roller 55 covered angle of rotation 57 is a measure of the opening angle 30 the door. For detecting the rotation angle 57 is the angle detector 2 over a rotation axis 56 with the rubber roller 55 mechanically connected.

3 shows a schematic flow diagram of a method for error detection of an angle detection device on a door of a motor vehicle. After starting 100 of the method is in a first step 101 queried by a closing sensor a binary state of the door. If the query indicates that the binary state of the door is "open", then the method step 101 repeated. If, on the other hand, the query indicates that the binary state of the door is "closed", then the next procedural step takes place 102 passed. In this process step 102 An opening angle of the door is detected by an angle detection device. In the subsequent process step 103 An angle signal output from the angle detector is detected by a controller. The detected angle signal is then compared by the controller with a safety angle 104 , If the detected angle signal is greater than or equal to the safety angle, a warning signal is output 105 , Optionally, the safety angle can be adjusted 106 For example, by choosing a larger value. By contrast, if the detected angle signal is not greater than or equal to the safety angle, the detected angle signal is compared with previously detected angle signals from the past 108 and determining a trend between the angle signals from the past and the currently detected angle signal. In the presence of a certain trend, for example a certain increase of the detected angle signal with time, a warning message can be issued 109 , which calls for a workshop visit. Subsequently, the process is repeated. Even if the safety angle has been adjusted 107 , the procedure is repeated. If a warning signal was issued and the safety angle was not adjusted 107 , the procedure is terminated 110 ,

LIST OF REFERENCE NUMBERS

1

 contraption

2

 Angle detection means

3

 closing sensor

4

 control

5

 Human-machine interface

6

 display

7

 interface

10

 Storage

11

 electronics

12

 corrector

13

 evaluation

20

 output angle signal

21

 safety angle

22

 warning

23

 report

24

 visually perceptible signal

30

 opening angle

31

 corrected opening angle

50

 motor vehicle

51

 door

52

 door mounting

53

 column mounting

54

 tether

55

 rubber roller

56

 axis of rotation

57

 angle of rotation

60

 binary state "open"

61

 binary state "closed"

100-108

 steps

Claims (10)

Method for error detection of an angle detection device ( 2 ) on a door ( 51 ) of a motor vehicle ( 50 ), comprising the following steps: detecting a binary state ( 60 . 61 ) the door ( 51 ) by a closing sensor ( 3 ), Detecting an opening angle ( 30 ) the door ( 51 ) by the angle detection device ( 2 ), Detecting one of the angle detection means ( 2 ) output angle signal ( 20 ) by a controller ( 4 ) when a binary state is "closed" ( 61 ), characterized in that the detected angle signal ( 20 ) with a predetermined safety angle ( 21 ) by the controller ( 4 ), whereby a warning signal ( 22 ) by the controller ( 4 ) is output when the amount of the detected angle signal ( 20 ) greater than or equal to the predetermined safety angle ( 21 ). Method according to claim 1, characterized in that the warning signal ( 22 ) at a human-machine interface ( 5 ) is output. Method according to Claim 2, characterized in that the warning signal ( 22 ) on a display device ( 6 ) in the form of a visually perceptible signal ( 24 ) is output. Method according to one of the preceding claims, characterized in that in addition to the warning signal ( 22 ) a maintenance recommendation ( 23 ) is output to the workshop visit and / or successively detected angle signals ( 20 ) by the controller ( 4 ) and compared with each other, with a predictive maintenance recommendation ( 23 ) by the controller ( 4 ) is output when an absolute value of consecutively detected angle signals ( 20 ) increases by a predetermined amount. Method according to one of the preceding claims, characterized in that in the binary state "opened" ( 60 ) after detecting the angle signal ( 20 ) by the angle detection device ( 2 ) detected opening angle ( 31 ) the door ( 51 ) by a correction device ( 11 ) by a value of the detected angle signal ( 20 ) and / or the predetermined safety angle ( 21 ) is adjusted. Contraption ( 1 ) in a motor vehicle ( 50 ) for error detection of an angle detection device ( 2 ) on a door ( 51 ) of the motor vehicle ( 50 ), comprising: at least one closing sensor ( 3 ) for detecting a binary state ( 60 . 61 ) the door ( 51 ), at least one angle detection device ( 2 ) for detecting an opening angle ( 30 ) the door ( 51 ), a controller ( 4 ), whereby the controller ( 4 ) is formed in the binary state "closed" ( 61 ) one of the angle detection device ( 2 ) output angle signal ( 20 ), characterized in that the controller ( 4 ) is further configured such that the detected angle signal ( 20 ) with a predetermined safety angle ( 21 ) and a warning signal ( 22 ) when the magnitude of the detected angle signal ( 20 ) greater than or equal to the predetermined safety angle ( 21 ). Contraption ( 1 ) according to claim 6, characterized in that the device ( 1 ) a human-machine interface ( 5 ) and the controller ( 4 ) is configured in such a way, the warning signal ( 22 ) at the human-machine interface ( 5 ). Contraption ( 1 ) according to claim 7, characterized in that the human-machine interface ( 5 ) a display device ( 6 ) and the controller ( 4 ) is configured in such a way, the warning signal ( 22 ) on the display device ( 6 ) in the form of a visually perceptible signal ( 24 ) and / or consecutively detected angle signals ( 20 ), to compare with each other and a predictive maintenance recommendation ( 23 ) when an absolute value of consecutively detected angle signals ( 20 ) increases by a predetermined amount. Contraption ( 1 ) according to one of claims 6 to 8, characterized in that the device ( 1 ) a correction device ( 12 ), wherein the correction device ( 12 ) is designed in such a way, in the binary state "open" ( 60 ) after detecting the angle signal ( 20 ) detected opening angle ( 30 ) the door ( 51 ) by a value of the detected angle signal ( 20 ) and / or the prescribed safety angle ( 21 ). Contraption ( 1 ) according to one of claims 6 to 9, characterized in that the device ( 1 ) a rubber roller ( 55 ) and a tether ( 54 ), wherein the rubber roller ( 55 ) and the tether ( 54 ) on the door ( 51 ) of the motor vehicle ( 50 ) are arranged that the rubber roller ( 55 ) when opening and closing the door ( 51 ) on the tether ( 54 ) and wherein the angle detection device ( 2 ) so with the rubber roller ( 55 ) that is connected to the movement of the rubber roller ( 55 ) along the tether ( 54 ) the opening angle ( 30 ) the door ( 51 ) can be detected and determined.

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