DE102008037950A1 - Electronic driver assistance system e.g. anti-lock braking system, for adjustment of brake and/or driving dynamics parameters of passenger car, has controller determining brake and/or driving dynamics parameters on basis of information - Google Patents

Abstract

The system (10) has recording devices (14, 14', 14'', 14''') recording information contained in identification units (16', 18', 20') arranged in vehicle wheels (16, 18, 20). A controller (22) determines adapted brake and/or driving dynamics parameters on basis of the detected information. One of the recording devices is arranged at a vehicle (12) i.e. commercial motor vehicle, and detects the wheels arranged at the vehicle. Pressure sensors (16'', 18'') are provided for monitoring tire pressure of the vehicle. The recording device stores the information in a memory of the units. An independent claim is also included for a method for adjustment of brake and/or driving dynamics parameters of a vehicle.

Description

The The invention relates to a system for adjusting brake and / or Vehicle dynamics parameters of a vehicle, the system at least a detection device that is suitable in on vehicle wheels to collect information contained arranged identification means and a controller.

The The invention further relates to a method for adapting brake and / or vehicle dynamics parameters of a vehicle, wherein the system at least one detection device that is in at vehicle wheels detected information contained arranged identification means, and a controller.

electronic Driver assistance systems, in particular those for braking and / or Driving dynamics control, often already belong to the standard Equipment of a vehicle. Examples of such driver assistance systems are an ABS system and an ESP system, or an EBS system, in which an ABS and ESP functionality integrated can be. Bases for the driver assistance systems are the individual vehicle characteristics, partly due to design or are dependent on the current vehicle condition and about Sensors are detected. To the design-related vehicle characteristics For example, the distance between the axes, while for example, to the changeable vehicle parameters the loading condition and the inclination angle of the vehicle belong.

Next the changeable vehicle parameters, the Sensors are detectable, there are other vehicle parameters, although changeable, but not by simple sensors are detectable. Examples are the vehicle wheels or vehicle tires. You can get off the vehicle be stolen or it can be wrong, bad or poorly retreaded vehicle wheels respectively Vehicle tires are mounted, which is often the cause of the accident is to be considered. Tire pressure monitoring systems have this Inadequate properties according to the current state of the art. Furthermore, not all vehicles have such systems feature.

The Driver assistance systems are therefore in terms of a middle Tire diameter designed and possibly post-parameterized, if other tire sizes are mounted. For example the tire diameter has a direct influence on the tachograph Detected speed and affects the tire dynamics also on an ESP system. The tire width is, for example, too for the ABS system of importance, as with increasing tire footprint a better vehicle deceleration is achievable.

Of the Invention has for its object to provide a system which capture the vehicle tires related vehicle parameters and adjust the existing driver assistance systems accordingly can.

These The object is achieved with the features of the independent claims solved.

advantageous Embodiments of the invention are in the dependent Claims specified.

The Invention builds on the generic system in that the control unit is suitable adapted Braking and / or driving dynamics parameters based on the information collected to determine. The system can therefore independently based the identification means supplied to the vehicle wheels adapted operating parameters for the driver assistance systems determine.

Usefully can be provided that each arranged on the vehicle and used vehicle at least one detection device assigned is to capture the identification means. That way is a change in the vehicle wheels, for example by theft or wheel change without further intervention of the driver detectable.

alternative can also be provided that a central detection device is provided on the vehicle, which arranged on the vehicle and used vehicle wheels detected. By use a central detection device can be the number the required for the vehicle detection devices to reduce. The central detection device can be designed to be mobile and via a wireless or wired connection, possibly with a plug, connected to the control unit be.

additionally can be provided that the system pressure sensors to control the tire pressure of the vehicle includes. Also has the tire pressure Effects on the handling of the vehicle, which is why he at The determination of the vehicle parameters is useful to take into account.

Furthermore, it can be provided that the control unit is connected to at least one further control unit which influences the braking and / or driving behavior of the vehicle. In this way, the adjusted vehicle parameters to the control units of the individual driver assistance sys be transmitted. If necessary, the transmitted information can be further processed there or, if already present in an adequate form, used directly for the adaptation of the respective driver assistance system.

alternative can be provided that the control unit in another Control unit, which determines the braking behavior and / or driving behavior of the vehicle is integrated. By integrating the Control unit in another control unit can be additional Electronic components can be saved.

It can also be provided that the detection device suitable is to information in a memory of the identification means to save. The storage of information in a memory of Identification means allows the coupling of additional Parameters to the vehicle wheels. For this purpose, for example Information regarding tire wear, in particular the mileage covered.

advantageously, can also be provided that the control unit suitable is to check the information collected for admissibility. In this way, for example, it can be determined whether the mounted vehicle tires are operated together with the vehicle may.

In order to contiguous may be provided that the control unit is capable of outputting a warning signal when the detected information is not allowed. By issuing a warning signal can the driver on a wrong or worn vehicle tire to be made aware.

Usefully can also be provided that the control unit suitable is to prevent the vehicle from continuing if the detected Information is not allowed. Especially after assembly an inappropriate vehicle tire, the vehicle is not in a roadworthy condition, which is why his participation in road traffic for safety reasons is to be prevented.

The Invention builds on the generic method for adaptation of braking and / or driving dynamics parameters thereby on that adapted braking and / or driving dynamics parameters based the detected information is determined.

On this basis, the advantages and specifics of the invention Systems also implemented under a procedure.

This is usefully further developed by the fact that Tire pressure of the vehicle when determining adapted brake and / or vehicle dynamics parameters is taken into account.

Usefully can be provided that the particular brake and / or Vehicle dynamics parameters transmitted to at least one other control unit become.

Especially It may be provided that the transmitted braking and / or vehicle dynamics parameters in the adaptation of the brake and / or Driving behavior of the vehicle are taken into account.

additionally can be provided that transmit information to the identification means and saved there.

advantageously, can also be provided that the control unit and / or at least one further control device, the detected information checked for admissibility.

In order to contiguous may be provided that the control unit and / or at least one further control device a warning signal if the information collected is not allowed.

Farther it can be provided that the control unit and / or at least another control unit continues to drive the vehicle prevents if the captured information is not allowed is.

The The present invention will now be described with reference to the accompanying drawings explained by way of example with reference to preferred embodiments:

It demonstrate:

1 a vehicle with a system according to the invention;

2 another vehicle with a system according to the invention;

3 an inventive system together with a vehicle wheel with identification means;

4 a detection device with an antenna and a transponder;

5 the structure of a typical transponder content;

6 the timing of a control loop of an ABS system with different vehicle parameters and

7 a flowchart for illustrating the method.

In In the following drawings, like reference characters designate the same or similar parts.

1 shows a vehicle with a system according to the invention. The system according to the invention 10 is in a vehicle 12 , in this case a commercial vehicle, integrated. The exemplary system 10 includes a controller 22 and a detection device 14 ' , wherein the detection device 14 ' in close proximity to a vehicle wheel 16 with identification means 16 ' is arranged. In the vicinity of other illustrated vehicle wheels 18 . 20 are other detection devices 14 '' . 14 ''' , etc., via the identification means 18 ' respectively 20 ' are detectable and can form the components of the system. Two more detection devices 14 one of them via a plug 32 and connection 34 with the control unit 22 are considered movable detection devices 14 designed and can be close to the vehicle wheels 16 . 18 . 20 to be brought. In this case, they are in close proximity to the individual vehicle wheels 16 . 18 . 20 arranged detection devices 14 ' . 14 '' . 14 ''' not necessary because the means of identification 16 ' . 18 ' . 20 ' from the movable detector 14 are detectable. All illustrated detection devices 14 . 14 ' . 14 '' . 14 ''' are with the control unit 22 coupled. An ABS control unit 24 , an EBS control unit 26 as well as an ESP control unit 28 are still in the vehicle 12 intended to control various driver assistance systems. The other controllers 24 . 26 and 28 are also with the control unit 22 connected. Furthermore, display means 36 in the vehicle 12 arranged and with the control unit 22 connected. About the display means 36 a warning signal can be output, for example by a display output or a warning lamp, to a driver on a non-permissible vehicle wheel 16 . 18 or 20 to draw attention.

2 shows another vehicle with a system according to the invention. The vehicle shown 12 is a passenger vehicle. The illustrated vehicle components are substantially identical to those in FIG 1 shown components identical. in addition, however, were pressure sensors 16 '' . 18 '' at the vehicle wheels 16 respectively 18 arranged and with the control unit 22 connected.

Notwithstanding the manner shown is also conceivable, the control unit 22 in one of the other control units 24 . 26 . 28 to integrate or the functionality of the control unit 22 on the other control units 24 . 26 . 28 to distribute. The detection of identification means 16 ' . 18 ' . 20 ' can either be done automatically, if the respective vehicle wheels 16 . 18 . 20 associated detection devices 14 ' . 14 '' . 14 ''' available. If this is not the case, then a detection of the identification means 16 ' . 18 ' . 20 ' manually by the mobile detection device 14 respectively. Are pressure sensors 16 '' . 18 '' present, so can the pressure level of the associated vehicle wheels 16 . 18 also considered who the. Those of the identification means 16 ' . 18 ' . 20 ' For example, detected information may be the exact type of vehicle wheel 16 . 18 . 20 , the date of manufacture and the previous mileage of the vehicle wheel 16 . 18 . 20 include. The previous mileage is preferably in a variable memory of the identification means 16 ' . 18 ' . 20 ' stored and can by the detection devices 14 . 14 ' . 14 '' . 14 ''' due to the vehicle 12 mileage corrected upwards. The detection of identification means 16 ' . 18 ' . 20 ' For example, it may be time and / or mileage driven. A more detailed description of the procedure is hereafter related to 7 given.

3 shows a system according to the invention together with a vehicle wheel with identification means. identification means 16 ' a vehicle wheel 16 become close to a detector 14 which, for example, means for optical information acquisition 42 includes. With their help, a barcode can be 38 of the vehicle wheel 16 capture and the information collected to the controller 22 hand off. Furthermore, the detection means may include means for engaging the vehicle wheel 16 integrated transponder 40 read. Such a transponder 40 usually includes an antenna, a receiver coil, a data carrier and a capacitor. The communication between transponder and detection device is preferably carried out encrypted and may also include methods for arbitration, z. B. according to the cryptographic method according to IEC 11785 or ISO 9798-2 , For this purpose, the transponder may also contain an additional logic circuit, such as a shift register or an ASIC, or a microprocessor for encrypted arbitration. Includes the transponder 40 a memory, such as EE-Prom or F-Ram, from the detector 14 can be manipulated, it can for example be deleted, or be described with interpreted information. This can be the mileage of this vehicle tire with this vehicle, date, time, location or other the control unit 22 include accessible information. Furthermore, the interpreted information can be stored in the controller itself or associated subsystems.

4 shows a detection device 14 with an antenna 44 and a transponder 40 , The transponder 40 has a ferrite antenna 50 , an induction coil 52 , a capacitor 54 and egg NEN memory 30 with a CPU 56 on. Will the antenna 44 the detection device 14 near the transponder 40 brought brought about, cause the emitted from the antenna electromagnetic waves 46 the activation of the transponder. Upon activation, information and energy are sent to the transponder 40 transmitted, which is operated with the received energy and in turn information as electromagnetic wave 48 back to the detection device 14 transfers.

5 shows the structure of a typical data field 58 a transponder memory content consisting of an Id field 60 the CPU, an id field 62 for the type of component, an id field 64 for the manufacturer and optionally an empty data field 68 , in the example, information about the installation time of the associated vehicle wheel or the mileage of the vehicle wheel of the detection device 14 can be written.

6 shows the timing of a control loop of an ABS system with different vehicle parameters. The uppermost graph shows the normal sequence, the middle graph shows a belated control intervention of an ABS system and the lower one an unnecessarily large control intervention of the ABS system. A too late or unnecessarily large control intervention of the ABS system is possible, for example, by non-adapted vehicle parameters.

Time is plotted on the x-axis and pressure or velocity on the y-axis as needed. The curve 106 each indicates the vehicle speed, the curve 108 denotes a vehicle wheel speed corresponding to the vehicle 12 with the vehicle speed curve 106 assigned. The curve 100 denotes the applied brake pressure and the line parallel to the x-axis 102 indicates the optimum brake pressure. Furthermore, results from the brake pressure curve 100 a temporal pressure change 114 representing the respective slope of the brake pressure curve 100 as well as from the wheel speed curve 108 , the slope 112 which describes the wheel speed change.

In all three graphs the vehicle becomes 12 braked. In the top graph, the brake pressure curve increases 100 first about the optimal brake pressure 102 out, whereupon the wheel speed curve 108 from the vehicle speed curve 106 removed and the corresponding wheel would soon block. This process is called overshoot 104 designated. The ABS system now regulates the brake pressure down so that the brake pressure curve 100 again under the optimal brake pressure 102 decreases and the Fahrzeugraddrehgeschwindigkeit increases again. As soon as the vehicle wheel turns sufficiently fast again, the ABS system regulates the brake pressure back up, so that the brake pressure curve 100 rises again.

In the middle graph, the vehicle wheel speed decreases before the ABS system intervenes. That is, the wheel speed curve 108 sinks already before a rule time 116 strong. To compensate for this, the ABS system introduces a large pressure drop 118 the brake pressure curve 100 one. Because of this large pressure drop 118 must then be compensated by a renewed pressure build-up in the service brake, when the vehicle turns again faster, the braking distance of the vehicle is extended. Too late a rule 116 may for example be caused by a change in wheel size, because then the measured vehicle speed does not coincide with the actual vehicle speed.

In lower graphs is an unnecessarily high pressure drop 120 shown. The trigger for this can also be a wrongly assumed wheel size or a better tire quality than expected. Even with this problem, brake is given away by the brake pressure curve 100 continues to drop while the wheel speed curve 108 already rising again.

7 shows a flowchart for illustrating the method. Starting point is step 200 in which a tire change is required. Subsequently, at step 202 a vehicle tire mounted and detected. At step 204 the recorded information is evaluated and at step 206 decided if the information is allowed. Is the information not allowed 206 -No, so is at 214 issued a warning, for example in the form of a warning lamp or an acoustic signal, and at step 216 the vehicle shut down. The decommissioning of the vehicle is advantageous because the vehicle wheels assume safety-critical functions and the reliability may not be guaranteed if impermissible or worn vehicle wheels are mounted. In order to put the vehicle back into operation, a tire change is still required, 200 , Is the information allowed, 206 -Yes, so will 208 the detected information changed, that is, for example, the mounting date and / or the distance traveled since the mounting of the detection device 14 ; 14 '; 14 ''; 14 ''' to the respective identification means 16 '; 18 '; 20 ' transferred and there in a store 30 saved. The control unit 22 can at 210 determine the adjusted vehicle parameters from the acquired information and to the other control devices 24 . 26 . 28 forward the driver assistance systems or directly to the detected information the other control devices 24 . 26 . 28 transmitted, which then independently determine the adapted vehicle parameters from the information. The vehicle 12 is now at step 212 operational. The process continues now at step 202 with the re-detection of the information which in the previous cycle at step 208 was changed. The re-detection of the information may be controlled cyclically or from the mileage achieved since the last acquisition. This approach allows the wear of the subject vehicle tire to be determined when the respective mileage since the last acquisition is added to the stored value. Also conceivable is a simpler variant, in which the mileage of the individual NEN vehicle wheels not in the identification means 16 ' . 18 ' . 20 ' the individual vehicle wheels 16 . 18 . 20 but are stored by the controller 22 get saved.

The in the above description, in the drawings and in the Claims disclosed features of the invention can both individually and in any combination for the To be essential to the realization of the invention.

10

system

12

vehicle

14

detector

14 '

detector

14 ''

detector

14 '' '

detector

16

vehicle

16 '

identification means

16 ''

pressure sensor

18

vehicle

18 '

identification means

18 ''

pressure sensor

20

vehicle

20 '

identification means

22

control unit

24

ABS control unit

26

EBS control unit

28

ESP control unit

30

Storage

32

plug

34

connection

36

display means

38

barcode

40

transponder

42

medium for information gathering

44

antenna

46

electromagnetic wave

48

electromagnetic wave

50

ferrite

52

induction coil

54

capacitor

56

processor

58

data field

60

Id field (CPU)

62

Id field (Component type)

64

Id field (Manufacturer)

68

free data field

100

Brake pressure curve

102

optimal brake pressure

104

overshoot

106

vehicle speed

108

Radgeschwindigkeitskurve

112

Raddrehfrequenzänderung

114

pressure change

116

Usually time

118

greater pressure drop

120

unnecessary pressure drop

200

tire change required

202

tires assemble / gather

204

information compare

206

information permissible

208

Change information

210

parameter Specify / forward

212

vehicle operational

214

warning output

216

vehicle shut down

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - IEC 11785 [0041]
• - ISO 9798-2 [0041]

Claims (18)

System ( 10 ) for adapting braking and / or driving dynamics parameters of a vehicle ( 12 ), whereby the system ( 10 ) - at least one detection device ( 14 . 14 ' . 14 '' . 14 ''' ) suitable for use on vehicle wheels ( 16 . 18 . 20 ) identification means ( 16 ' . 18 ' . 20 ' ), and - a control unit ( 22 ), characterized in that the control unit ( 22 ) is adapted to determine adapted braking and / or driving dynamics parameters based on the detected information. System ( 10 ) according to claim 1, characterized in that each on the vehicle ( 12 ) arranged and used vehicle wheel ( 16 . 18 . 20 ) at least one detection device ( 14 ' . 14 '' . 14 ''' ) is assigned to the identification means ( 16 ' . 18 ' . 20 ' ) capture. System ( 10 ) according to claim 1, characterized in that a central detection device ( 14 ) on the vehicle ( 12 ) provided on the vehicle ( 12 ) arranged and used vehicle wheels ( 16 . 18 . 20 ) detected. System ( 10 ) according to one of the preceding claims, characterized in that the system pressure sensors ( 16 '' . 18 '' ) for controlling the tire pressure of the vehicle ( 12 ). System ( 10 ) according to one of the preceding claims, characterized in that the control unit ( 22 ) with at least one further control device ( 24 . 26 . 28 ), which determines the braking and / or driving behavior of the vehicle ( 12 ) is connected. System ( 10 ) according to one of the preceding claims, characterized in that the control unit ( 22 ) into another control device ( 24 . 26 . 28 ), which determines the braking behavior and / or driving behavior of the vehicle ( 12 ) is integrated. System ( 10 ) according to one of the preceding claims, characterized in that the detection device ( 14 . 14 ' . 14 '' . 14 ''' ) is suitable for storing information in a memory ( 30 ) of the identification means ( 16 ' . 18 ' . 20 ' ) save. System ( 10 ) according to one of the preceding claims, characterized in that the control unit ( 22 ) is suitable for checking the information collected for admissibility. System ( 10 ) according to claim 8, characterized in that the control unit ( 22 ) is capable of outputting a warning signal if the detected information is not permitted. System ( 10 ) according to claim 8 or 9, characterized in that the control unit ( 22 ) is suitable for continuing the vehicle ( 12 ), if the information collected is not allowed. Method for adapting braking and / or driving dynamics parameters of a vehicle ( 12 ), whereby the system ( 10 ) - at least one detection device ( 14 . 14 ' . 14 '' . 14 ''' ) used in vehicle wheels ( 16 . 18 . 20 ) identification means ( 16 ' . 18 ' . 20 ' ), and - a control unit ( 22 ), characterized in that adapted braking and / or driving dynamics parameters are determined on the basis of the detected information. Method according to claim 11, characterized in that the tire pressure of the vehicle ( 12 ) is taken into account in the determination of adapted braking and / or driving dynamics parameters. A method according to claim 11 or 12, characterized in that the determined braking and / or driving dynamics parameters at least one further control device ( 24 . 26 . 28 ). A method according to claim 13, characterized in that the transmitted braking and / or driving dynamics parameters in the adaptation of the braking and / or driving behavior of the vehicle ( 12 ). Method according to one of claims 11 to 14, characterized in that information to the identification means ( 16 ' . 18 ' . 20 ' ) and stored there. Method according to one of claims 11 to 15, characterized in that the control device ( 22 ) and / or at least one further control device ( 24 . 26 . 28 ) checks the information collected for admissibility. Method according to claim 16, characterized in that the control unit ( 22 ) and / or at least one further control device ( 24 . 26 . 28 ) outputs a warning signal if the detected information is not permitted. Method according to claim 16 or 17, characterized in that the control unit ( 22 ) and / or at least one further control device ( 24 . 26 . 28 ) a continuation of the vehicle ( 12 ) is prevented if the acquired information is not allowed.