DE102013106769A1 - Tachograph with the lane keeping and collision warning function - Google Patents

Abstract

A tachograph incorporating a lane departure warning and a collision warning assistant, which combines the tachograph functions with the Lane Departure Warning and Collision Warning Assistant functions, the Lane Keeping Assist and the Collision Warning Assistant using their image sensor elements (CCD or CMOS sensor) to image data capture high resolution, which are then forwarded to the image processing unit and recognized from there or edited, wherein a measuring range and its detection distance can be increased by an image editing method and a zoom method. In conjunction with recorded vehicle signals, the tachograph assesses whether a driving behavior of a driver is dangerous. If a dangerous driving behavior is detected, the driver is warned accordingly. As a result, a higher driving safety is granted, the tachograph can help in case of traffic accident in a liability distribution, which further increases the usability of the tachograph.

Description

The invention relates to a tachograph, in particular a tachograph with a lane keeping and Kollisionswarnassistent.

The currently known tachographs usually have a variety of functions and can, for example, automatically record various image data inside or outside a vehicle during a journey, so that a driver's misconduct or a situation that can trigger a road accident or a dangerous situation, be examined in a subsequent analysis.

The collision warning assistant and the lane departure warning, which are mentioned at the beginning, belong to the prior art, is monitored in the current driving situation due to an image recognition technology. A disadvantage, however, in the known image recognition technique that image recognition usually requires a high processing power and a relatively longer computation time, with a determination of characteristics in an image file is relatively difficult, resulting in that a monitoring system that operates due to the image recognition technology , has only a relatively lower resolution, so that its scope is currently limited only to park radar or similar surveillance systems that monitor a movement at a lower speed, primarily to a collision warning system for near distance. Thus, all tachographs produced according to the conventional technology can be further improved because they usually have at least one of the following disadvantages: For example, they can not warn the driver more accurately of a driving condition, or a distance to a preceding vehicle detected by them is for driving safety low, or they have a complicated construction, or they require high manufacturing costs, etc.

The invention has for its object to provide a provided with a lane keeping and Kollisionswarnassistent tachograph, which can detect a preceding vehicle at a relatively greater distance, the tachograph has a simpler design, takes a relatively small footprint and requires reduced manufacturing costs can be produced

This object is achieved by a provided with a lane keeping and Kollisionswarnassistent tachograph having the features specified in claim 1. Further advantageous developments of the invention will become apparent from the dependent claims.

According to the invention, there is provided a tachograph provided with a lane keeping and collision warning assistant installed in a motor vehicle and comprising:
a main unit, which is designed in the form of a separate device;
a control unit incorporated in the main body, the control unit judging a compression unit, an image processing unit, a lane departure lane detection unit, a distance measurement unit that distances to a preceding vehicle, a data combination and synchronization unit, and a warning decision unit that judges whether a warning is issued;
an image acquisition unit, which is in the form of a separate device and is connected by means of a plug attached to a cable to a connector formed on the main image acquisition port, the image acquisition unit for detecting image data in front of the motor vehicle, wherein an image signal is generated, the can be entered into the control unit;
a driving data acquisition unit, which is embodied in the form of a separate device and is connected to a travel data acquisition terminal formed on the main device by means of a plug attached to a connecting cable, wherein the driving data acquisition unit is used to record operating data of the motor vehicle, wherein a vehicle signal is generated which in the control unit is input;
a storage unit connected to a data combination and synchronization unit of the control unit, the storage unit serving to store the data processed by the control unit; and
a warning unit connected to the warning decision unit of the control unit.

The image data acquired by the image acquisition unit can be compressed by the compression unit of the control unit and then stored in the storage unit via the data combination and synchronization unit. The image data acquired by the image acquisition unit can be processed by the image processing unit of the control unit, whereby a measurement area and its detection distance can be enlarged by an image slice method and a zoom method such that a maximum distance to be detected from the preceding vehicle is approximately 100 m. The image data acquired by the image capturing unit are processed by the image processing unit so as to be respectively divided into the lane measurement image data and the distance measurement image data, and accordingly inputted separately to the traffic lane measurement unit and the distance measurement unit. The image data is then input to the warning decision unit, so that the Control unit can measure a distance to a vehicle ahead and calculate a lane deviation. In conjunction with the detected vehicle signals, it is determined whether a current driving behavior of the driver is dangerous. If a dangerous driving behavior is detected, the warning decision unit outputs a control signal to the warning unit so that it warns the driver of a danger with a warning signal.

In the following the invention and its embodiments will be explained in more detail with reference to the drawings. In the drawings shows:

1 a schematic representation of a vehicle installed in a tachograph according to the invention in use;

2 a block diagram of an embodiment of a tachograph according to the invention; and

3 a block diagram of another embodiment of a tachograph according to the invention.

Based on accompanying drawings, 1 and 2 an inventive tachograph in which a lane departure warning and a collision warning assistant are provided, presented in one embodiment. In the 1 lane markers whose distance from the vehicle serves as reference points for detecting lane departure of the vehicle are indicated by arrows A. The arrow B in the drawing represents a measuring range in which the distance of the vehicle to a preceding vehicle is detected, while the arrow C shows a recording area of the tachograph. The tachograph according to the invention, in which the lane departure warning assistant and the collision warning assistant are integrated, is installed in a motor vehicle. For example, the tachograph can be mounted inside the front windshield or at the top of the instrument panel of the motor vehicle, so that the tachograph operates independently of the weather and is not so easily polluted. The tachograph according to the invention comprises a main unit 10 , a control unit 20 , an image capture unit 30 , a driving data acquisition unit 40 , a storage unit 50 and a warning unit 60 ,

The main unit 10 is in the form of a separate device.

The control unit 20 consisting of a compression unit 21 , an image processing unit 22 , a lane reading unit 23 for detecting lane deviations, a distance measuring unit 24 for detecting a distance to a preceding vehicle, a data combination or data synchronization unit 25 and a warning decision unit 26 , will be in the main unit 10 appropriate.

The compression unit 21 is used for compressing images and sounds generated by the image capture unit 30 in the control unit 20 are input, the compressed data for further processing to the data combination or data synchronization unit 25 forwarded and after processing in the storage unit 50 be stored. The from the image acquisition unit 30 in the control unit 20 Input images are processed by the image processing unit 22 edited and then to the lane gauge unit 23 and the distance measuring unit 24 forwarded so that the lane gauge unit 23 checks whether a lane departure happens while the distance measuring unit 24 detects whether there is a preceding vehicle in the measuring range, wherein the lane reading unit 23 and the distance measuring unit 24 recorded results to the warning decision unit 26 be routed so that it judges from the results obtained whether a warning is issued. The data combination or data synchronization unit 25 serves to summarize and synchronize the data from different sources (such as: image files, noise files and data from different peripherals). The warning decision unit 26 judges from the obtained data whether a predefined warning signal is issued. (For example, it will beep three times if the distance to a vehicle ahead is too low, or a yellow light will flash if a GPS device is not put into operation.) The above control unit 20 operates in a multi-process operation and can perform several tasks such as handling a lane deviation, detecting distance of a preceding vehicle, compressing image and noise files and data storage concurrently. The above-mentioned data from peripheral devices may be operating data of the vehicle, GPS-dependent driving data or the data acquired by a G-sensor.

The image capture unit 30 can either be in the main unit 10 arranged or external to the main unit as an external device 10 be connected. The image capture unit 30 is used to capture environmental images on a road ahead of the vehicle, wherein an image signal is generated, which in the main unit 10 built-in control unit 20 is entered. In the embodiment, the image capture unit 30 by means of a connecting cable to the main unit 10 connected. Using a photosensitive Electronic component such as a CCD sensor or a CMOS sensor, the image data with a high resolution to the image processing unit 22 the control unit 20 output and processed by the measuring range and its detection distance of the image acquisition unit 30 can be increased by an image cutting method and a zoom method so that a detection distance L is formed in front of the vehicle. Like in the 1 shown, the detection distance L ranges from 0 to 100 meters. By increasing the detection distance and restricting the image processing to a certain range, a required computing speed can be reduced, so that the control unit 20 Depending on the image signal obtained, a vehicle that is driving ahead within 100 m on an identical lane as well as on an adjacent, left or right lane can detect. In addition, the image capture unit 30 be implemented in the form of a camera lens, which by means of a connector attached to a cable at a connector on the main unit 10 trained image capture port 101 Connects to the camera lens with the main unit 10 interacts. In addition, said image signals can be controlled by the control unit 20 on an image output unit 70 displayed, the image output unit 70 either one on the main unit 10 attached screen or by means of an audio and video output cable outside the main unit 10 connected, external display device can be. The from the image acquisition unit 30 captured image data with a relatively higher resolution (from 640 × 480) are transmitted to the control unit by a distortion-free process 20 forwarded.

The driving data acquisition unit 40 becomes external to the main unit 10 is connected and used for detecting operating data of the vehicle, wherein a vehicle signal (such as: a speed signal, a left or a right turning direction indicator signal, a brake light signal, etc., which can help a judgment) is generated, which in the Datenkombinations- or Data synchronization unit 25 and warning decision unit 26 in the main unit 10 attached control unit 20 is entered. The of the compression unit 21 and the driving data acquisition unit 40 incoming data is passed through the data combination or data synchronization unit 25 edited so that they are summarized either in the form of a text file or in the form of a compressed video and audio file combined with the text file. The driving data acquisition unit 30 is in the form of an external device, by means of a mounted on its connecting cable connector on one of the main unit 10 trained driving data acquisition terminal 102 connected so that they are connected to the main unit 10 interacts. With the aid of the image recognition technology, the tachograph according to the invention can use the obtained driving data to assess whether the driver drives safely, which not only increases a recognition rate and thus the measuring range of the tachograph, but also allows the tachograph to be informed of the current driving status on the basis of the obtained driving data. This realizes that the tachograph can warn the driver even more accurately, which not only reduces false warnings but also increases system stability. For example, if the driving data (such as left and right turning direction indicator signals) are not used, the tachograph may warn the driver of an intended lane change because the lane change results in a departure from the original lane, causing the driver can be wrong.

The storage unit 50 serves to store by the control unit 20 (the data combination or data synchronization unit 25 ) of the main unit 10 edited data, images and sounds. The storage unit 50 can either have a hard disk directly in the main unit 10 installed and with the control unit 20 or a CF or SD memory card, which is not limited in the present invention. So the storage unit 50 like a CF or SD memory card into the main unit 10 can be inserted or excluded from this is an insertion opening 103 on the main unit 10 educated. The above image signals are first passed through the compression unit 21 the control unit 20 compressed and then into the storage unit 50 stored.

The warning unit 60 can either be in the main unit 10 installed or external to the main unit 10 be connected, the warning unit 60 electrically with the in the main unit 10 built-in control unit 20 is connected. Depending on the operating state of the main unit 10 generates the control unit 20 a corresponding control signal, ie the warning decision unit 26 generates a control signal. Based on this control signal gives the warning unit 60 a warning signal to fulfill a warning function, wherein the warning signal warns the driver visually and / or acoustically (such as by a light, a sound, a vibration). In the exemplary embodiment, the images from the image acquisition unit 30 captured image signals first by the image processing unit 22 the control unit 20 which judges whether the signals are for the lane departure warning assistant or for the collision warning assistant. Accordingly, the signals become separately in the traffic lane measuring unit 23 and in the distance measuring unit 24 entered so the control unit 20 Depending on the received image signals, the distance to a vehicle in front is detected and a lane deviation is calculated. With the help of the driving data acquisition unit 40 detected vehicle signals is judged whether a current driving behavior of the driver is dangerous, wherein a control signal is generated. If a dangerous driving behavior is detected, the warning unit indicates 60 After the control signal, a warning signal to warn the driver of dangerous driving behavior.

In 3 is shown a further embodiment of the tachograph according to the invention. Because the embodiment is a variant of the above-mentioned embodiment, the similar parts will not be explained here. The main difference is that the tachograph according to the invention in this embodiment also has a sound detection unit 80 , a GPS device 90 and a G-sensor 100 includes.

The sound detection unit 80 is connected to one of the main unit by means of a plug attached to a connection cable 10 trained noise detection port 104 connected and with the control unit 20 of the main unit 10 connected. The sound detection unit 80 is used to detect the noise in the environment of the vehicle, wherein a noise signal is generated, which in the control unit 20 is entered. The sound detection unit 80 can be a microphone.

The GPS device 90 is in the form of a separate device and is connected by means of a connector attached to a cable to a connector on the main unit 10 trained GPS connection 105 connected. The GPS device 90 is used to record coordinates and driven tracks of the motor vehicle whose global time and date are updated automatically, wherein a drive signal is generated in the data combination and synchronization unit 25 in the main unit 10 built-in control unit 20 is entered so that the data combination and synchronization unit 25 that of the compression unit 21 and from the driving data acquisition unit 40 coming data combined with the data of the driving signal. For example, the above data may be summarized either in a text file or in a compressed image file associated with the text file.

The G-sensor 100 will be in the main unit 10 attached and with the control unit 20 connected. The G-sensor 100 is used to detect a change in position in the X, Y and Z axes, wherein a sensor signal generated thereby in the control unit 20 of the main unit 10 is entered. In case of an accident, a current driving state such as acceleration, braking, turning, etc., for example, can be clearly recognized based on the detected position change in the X, Y and Z axes, for example.

As a further improvement, the control unit 20 another on-screen display 27 and a parameter setting unit 28 include. The on-screen display 27 The purpose of this is to provide up-to-date time and vehicle status (namely, operating data collected as vehicle signals by the GPS device 90 provided driving data) on an original image background (namely on the image acquisition unit 30 captured image data), wherein the image data combined with the operation and driving data by an image output unit 70 can be displayed. The parameter setting unit 28 Allows a user to set required parameters in the compression unit 21 , the image processing unit 22 and the distance measuring unit 24 by means of at least one on the main unit 10 attached and electrically connected to the control unit 20 connected button 281 set, whereby made adjustments in a main memory 200 be enrolled, which further increases the serviceability of the tachograph.

In the present invention, the compression unit requires 21 , the lane gauge unit 23 and the distance measuring unit 24 the control unit 20 very different image data. Thus, the original captured image data is processed by the image processing unit 22 edited so that the image data for further processing depending on a desired image area to the lane measurement unit 23 and the distance measuring unit 24 be distributed.

The Lane Keeping Assist usually requires wide-angle images whose upper limit is restricted, while the Collision Warning Assistant needs narrow-angle images whose viewing angle is limited to one lane. The captured by the tachograph original images are the wide-angle images with a high resolution. It is known that a vehicle ahead farther than 50 meters away can not be detected at a general resolution. Therefore, the image data having a high resolution is used in the present invention, which not only increases the detection distance, but also makes it possible to limit the image data to a certain processing area and thus to reduce a required computation speed.

Based on the enclosed 3 are individual processes of the tachograph according to the invention such as image acquisition, lane detection, distance detection of a preceding Vehicle, image data output and warning explained below:
When taking the image, those from the image acquisition unit 30 captured image data and that of the sound detection unit 80 recorded noise signals in the compression unit 21 compressed. Then the compressed data is merged with that from the driving data acquisition unit 40 recorded vehicle signals from the GPS device 90 recorded driving signals, that of the G-sensor 100 collected sensor signals and into the memory unit 50 stored.

In the lane detection are those of the image acquisition unit 30 captured image data by the image processing unit 22 divided in different viewing angles, wherein the image data required for the lane detection with a desired viewing angle in the lane reading unit 23 can be entered so that they can detect the lane deviations. The recorded results are sent to the distance measuring unit 24 and the warning unit 60 forwarded.

In the distance detection of a vehicle ahead, those of the image acquisition unit 30 captured image data by the image processing unit 22 divided into different viewing angles, wherein the image data required for distance detection in the distance measuring unit 24 so that they can use the results obtained in the lane departure to assess whether there is a preceding vehicle. The calculated results are sent to the warning unit 60 forwarded.

In the image output are those of the image capture unit 30 captured image data according to a corresponding system state together with the detected results of individual observations on a display device (the image output unit 70 ) or by means of an audio and video output cable (the image output unit 70 ).

The warning sequence is based on the detected results of the lane measurement unit 23 , the distance measurement unit 24 and the driving data acquisition unit 40 as well as that of the G-sensor 100 detected signals judges whether a warning is necessary to warn the driver of a danger.

A driver's fatigue due to a long-term drive and too short a safety distance to a vehicle in front could easily lead to a traffic accident. Thus, the tachograph according to the invention with the lane departure warning assistant and the collision warning assistant can assist the driver better during a journey. Unfortunately, such a combination is not available in the prior art. In addition, no similar or similar construction is currently available.

Due to the resolution and the viewing angle of the image data, a conventional image acquisition construction can not detect a vehicle ahead more than 50 m in front of the motor vehicle. Although the measurement range of such an image acquisition design was later increased by a newly developed technique using at least two image capture devices, such image capture design can still be improved because it takes up more space and is therefore not competitive.

In contrast, a lane departure warning assistant and a collision warning assistant, both of which can accommodate the image data with a higher resolution, thanks to their photosensitive CCD or CMOS sensor, are integrated in the tachograph according to the invention. The higher resolution image data acquired by the lane departure warning assistant and the collision warning assistant are processed by the image processing unit 22 the control unit 20 is detected and processed, wherein the measuring range and its detection distance of the tachograph are increased by an image editing method and a zoom method. In conjunction with the driving data acquisition unit 40 detected vehicle signals is judged whether the current behavior of the driver is dangerous. If so, gives the warning unit 60 an optical and / or audible warning signal, which increases the reliability and stability of the tachograph. The images in front of the motor vehicle and the noises in the vicinity of the motor vehicle are detected by the tachograph according to the invention and sent to the control unit 20 forwarded, wherein said image and noise data, which can be presented as evidence in the event of a traffic accident, after compression in the memory unit 50 how to save an SD or CF memory card.

In the present invention, the functions of the lane departure warning assistant, the collision warning assistant and the functions of the tachograph are integrated in a single device, so that the driver no longer has to install the three devices separately in his motor vehicle, which not only simplifies the assembly and takes up less space decreases, but also lowers manufacturing costs. Thus, the present invention is competitive and beneficial to its users.

• 1. Die erfindungsgemäße Bilderfassungseinheit stellt der Steuereinheit die Bilddaten mit einer hohen Auflösung zur Verfügung, was nicht nur die Erkennungsrate erhöht, sondern auch den Erfassungsbereich erweitert.
• 2. Erfindungsgemäß wird der Fahrzustand mithilfe von Fahrzeugsignalen beurteilt, was nicht nur falsche Warnungen reduziert, sondern auch die Systemstabilität erhöht.
• 3. Der erfindungsgemäße Fahrtenschreiber verfügt über einen relativ größeren Messbereich und kann ein innerhalb von 100 m auf einer gleichen Fahrspur und auf einer benachbarten, linken bzw. rechten Fahrspur vorausfährt, erfassen, sodass der Fahrer rechtzeitig vor einem zu geringen Sicherheitsabstand gewarnt wird, um Unfälle zu vermeiden.
• 4. Erfindungsgemäß wird keine Bildauflösungsreduziereinheit eingesetzt, wobei auch weder Codiereinheit noch Decodiereinheit benötigt werden, was nicht nur eine Verzerrung bei einer Bilderumsetzung reduziert, sondern auch eine Bilderkennungsrate und somit die gesamte Erkennungsrate des Fahrtenschreibers erhöht.
• 5. Der erfindungsgemäße Fahrtenschreiber weist eine einfachere Konstruktion auf und nimmt daher einen relativ kleineren Platzbedarf in Anspruch, wobei Fertigungskosten auch durch die einfachere Konstruktion erniedrigt werden.

Compared with the prior art, the tachograph according to the invention has the following advantages:

• 1. The image acquisition unit according to the invention provides the control unit with the image data with a high resolution, which not only increases the recognition rate but also expands the coverage area.
• 2. According to the invention, the driving state is assessed by means of vehicle signals, which not only reduces false warnings, but also increases system stability.
• 3. The tachograph according to the invention has a relatively larger measuring range and can be within a 100 m in an identical lane and on an adjacent, left or right lane ahead, detect so that the driver is warned in good time before too low a safety distance to avoid accidents.
• 4. According to the invention, no image resolution reduction unit is used, neither coding unit nor decoding unit being required, which not only reduces distortion in a picture conversion, but also increases an image recognition rate and thus the overall recognition rate of the tachograph.
• 5. The tachograph according to the invention has a simpler construction and therefore takes a relatively smaller space requirement, wherein manufacturing costs are also reduced by the simpler design.

LIST OF REFERENCE NUMBERS

10

main unit

20

control unit

21

compression unit

22

Image processing unit

23

Lane measuring unit

24

Distance measuring unit

25

Data combination and synchronization unit

26

Warning decision unit

27

On-screen display

28

Parameter adjustment unit

281

button

30

Image capture unit

40

Driving data acquisition unit

50

storage unit

60

warning unit

70

Image output unit

80

Tone detection unit

90

GPS device

100

G-Sensor

101

Image capture terminal

102

Driving data collection terminal

103

insertion opening

104

Tone detection connection

105

GPS connection

200

random access memory

Claims (10)

Tachograph provided with a lane keeping and collision warning assistant, installed in a motor vehicle and comprising: a main unit ( 10 ), which is designed in the form of a separate device; a control unit ( 20 ) in the main unit ( 10 ) is installed, wherein the control unit ( 20 ) a compression unit ( 21 ), an image processing unit ( 22 ), a lane reading unit ( 23 ) for detecting lane deviations, a distance measuring unit ( 24 ), which measures a distance to a preceding vehicle, a data combination and synchronization unit ( 25 ) and a warning decision unit ( 26 ) which judges whether a warning is issued; an image capture unit ( 30 ), which is designed in the form of a separate device and by means of a plug attached to a connecting cable to one of the main devices ( 10 ) image capture port ( 101 ), the image acquisition unit ( 30 ) is used to capture image data in front of the motor vehicle, wherein an image signal is generated, which in the control unit ( 20 ) can be entered; a driving data acquisition unit ( 40 ), which is designed in the form of a separate device and by means of a plug attached to a connecting cable to one of the main devices ( 10 ) formed Fahrdatenerfassungs connection ( 102 ), wherein the driving data acquisition unit ( 40 ) for detecting operating data of the motor vehicle, wherein a vehicle signal is generated, which in the control unit ( 20 ) can be entered; a storage unit ( 50 ) connected to a data combination and synchronization unit ( 25 ) of the control unit ( 20 ), the memory unit ( 50 ) is used by the control unit ( 20 ) to save processed data; and a warning unit ( 60 ) associated with the warning decision unit ( 26 ) of the control unit ( 20 ), the image acquisition unit (s) 30 ) captured image data by the compression unit ( 21 ) of the control unit ( 20 ) and then via the data combination and synchronization unit ( 25 ) in the memory unit ( 50 ) are storable; the image acquisition unit ( 30 ) captured image data by the image processing unit ( 22 ) of the control unit ( 22 ) are machinable, wherein a measuring range and its detection distance can be increased by an image-cutting method and a zoom method, so that a maximum distance to be detected to the preceding vehicle about 100 m is; and wherein the images acquired by the image acquisition unit ( 30 ) captured image data by the image processing unit ( 22 ) are editable so that they respectively in the image data for a lane measurement and the image data for divided a distance measurement and accordingly separately into the lane measurement unit ( 23 ) and the distance measuring unit ( 24 ), whereupon the image data is entered into the warning decision unit ( 26 ) so that the control unit ( 20 ) can measure a distance to a preceding vehicle and calculate a lane deviation, and in conjunction with the vehicle signals detected thereby, it is determined whether a current driving behavior of the driver is dangerous, and if, when a dangerous driving behavior is detected, the warning decision unit ( 26 ) a control signal to the warning unit ( 60 ) so that it warns the driver of a danger with a warning signal. Tachograph according to claim 1, characterized in that the control unit ( 20 ) a parameter setting unit ( 28 ) so that a user has corresponding parameters in the compression unit ( 21 ), the image processing unit ( 22 ) and the distance measuring unit ( 24 ) by means of at least one on the main unit ( 10 ), electrically connected to the control unit ( 20 ) button. Tachograph according to claim 1, characterized in that the control unit ( 20 ) also has an on-screen display ( 27 ) comprising the image acquisition unit ( 30 ) and the operating data of the motor vehicle recorded as vehicle signals, the data then being fed to an image output unit ( 70 ) and the image output unit ( 70 ) on the main unit ( 10 ) and with the control unit ( 20 ), and wherein the image output unit ( 70 ) is executed as a screen. Tachograph according to claim 1, characterized in that the tachograph further comprises a sound detection unit ( 80 ), which is connected by means of a connector attached to a connecting cable to one on the main unit ( 10 ) formed sound detection terminal ( 104 ) and connected to the control unit ( 20 ), wherein the sound detection unit ( 80 ) is used to detect the noise in the vicinity of the motor vehicle, wherein a noise signal is generated, which in the control unit ( 20 ) and by the compression unit ( 21 ) and stored in the memory unit ( 50 ), wherein the sound detection unit ( 80 ) is a microphone. Tachograph according to claim 1, characterized in that the tachograph further comprises a GPS device ( 90 ), which is designed in the form of a separate device and by means of a plug attached to a connecting cable to a on the main unit ( 10 ) attached GPS port ( 105 ), wherein the GPS is used for recording coordinates and driven tracks of the motor vehicle, wherein a driving signal is generated, which in the control unit ( 20 ) of the main unit 10 is entered. Tachograph according to claim 1, characterized in that the tachograph further comprises a 10 ) built-in G-sensor ( 100 ) connected to the control unit ( 20 ), the G-sensor ( 100 ) for detecting a change in position in the X, Y and Z axes, wherein a sensor signal is generated, which in the control unit ( 20 ) of the main unit ( 10 ) can be entered. Tachograph according to claim 1, characterized in that the image capture unit ( 30 ) captures the image data with a higher resolution of 640 × 480, so that the image data into the control unit without distortion ( 20 ), whereby the image recognition rate and the range for acquiring the distance to a preceding vehicle can be increased. Tachograph according to claim 1, characterized in that the image capture unit ( 30 ) has a photosensitive, electronic image sensor element, which is a CCD sensor [Abbr. for charge-coupled device or a CMOS sensor [abbr. for Complementary Metal Oxide Semiconductor]. Tachograph according to claim 1, characterized in that the memory unit ( 50 ) is selected from a group that includes an SD memory card, a CF memory card, and a hard disk. Tachograph according to claim 1, characterized in that the warning signals issued by the warning unit ( 60 ) are formed from a group having an optical, an audible warning signal and a combination of an optical and an acoustic warning signal.

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