DE102004048983A1 - Motor vehicle starting up method, involves entering security code on electronic key and/or access authorization device, and unlocking doors and/or releasing anti-theft device after successful verification of code - Google Patents

Abstract

The method involves entering a security code on an electronic motor vehicle key (100) and/or an access authorization device by a user. Doors of the vehicle are unlocked and/or an anti-theft device is released after a successful verification of the entered code. A control unit sends a random number and a coded lock password to the key, where the password is decoded in the key using the number and is verified. An independent claim is also included for an anti-theft protection system comprising a control unit.

Description

The The invention relates to a method for starting up a motor vehicle through an electronic key according to the generic term of claim 1 and an anti-theft system according to the preamble of claim 6.

Out In the prior art motor vehicle keys are known, which for unlocking the automobile doors in addition to the still existing, conventional mechanism - the opening with the Key Beard - a remote-controlled, electronic actuation of the locking system use. The practical advantages are obvious hereby arise, that the opening of the motor vehicle already at the approach to the same vonstatten goes. From a safety point of view, however, one has to complain that a motor vehicle theft by this modern form of commissioning med Motor vehicle is facilitated. So it happens to the owners of Motor vehicles frequently, that they are the car keys misplace or lose. Now, a person who is unjustified in possession of the vehicle key often suspect where the associated motor vehicle at least approximately located. This is especially true in the vicinity of parking garages, parking lots and various venues such as club grounds. The Unauthorized person can then by pressing the button of the electronic Key that Find motor vehicle relatively quickly, as this is reflected by the light up the lighting system, switching on the interior lighting or else simply acoustically by the noise the door unlocking identified, as long as the person only in the transmission and reception area of the motor vehicle located.

The Commissioning of a motor vehicle generally takes place in two Steps of establishing the access authorization (Open and Shut down the vehicle doors) and the release the immobilizer, with which numerous vehicles are equipped, to prevent the activation of the starter, as long as the safety system not turned off by the user. From the state of the art is a set of different procedures for putting a Motor vehicle known. These generally concern electronic keys which after the operation a key from a transponder device issued a signal is, which of a control unit in the motor vehicle or Received and verified in the castle. In addition to these keys with remote control are to open and closing the automobile doors Also known systems in which the closing or opening of the Central locking is automatically initiated by that Himself the key carrying vehicle owners within or outside a certain distance from the motor vehicle.

From the prior art methods are further known, which relate to the coding of the exchanged between the electronic key and the control unit in the motor vehicle signals. So revealed the DE 101 47 085 A1 a method for performing an authorization of an ignition key, wherein in consecutive steps differently coded passwords are exchanged between an engine control unit and the ignition key. In addition, a random number is generated in the engine control unit, which is transmitted to the ignition key and is a common basis for performing a decoding process on both sides. It describes a practical method to perform the encoding and decoding in shift registers.

In addition, further developments of the electronic key are known from the prior art, which have display units mounted on the key body. So is out of the DE 299 02 629 U1 a motor vehicle key with integrated display is known, which uses a transmitter and a receiver for information and / or control signals and an electrophoretic display unit.

Of the Invention is based on the object, a process for the preparation the access authorization to a motor vehicle by means of an electronic Motor vehicle key indicate which one increased Theft protection granted. Also, by the method the possibility of so-called Carjackings, the theft of a motor vehicle under the Threat of violence, be diminished.

According to the invention this object is achieved by means of a method with the features mentioned in claim 1 or by means of an anti-theft system with the features mentioned in claim 6. In the method according to the invention for starting up a motor vehicle, a security code is entered on the electronic motor vehicle key and / or on the access authorization device by the user. Upon successful verification, the vehicle doors are unlocked and / or the immobilizer is released. By this measure, the risk of theft is reduced because the access to the motor vehicle remains limited to the group of people who knows the security code. Thus, the theft security of the motor vehicle is significantly improved. Also, a carjacking is made more difficult, as it is for ei potential thief is now no longer sufficient to obtain only the possession of the original key. It is now possible to have the verification of the entered security code carried out either on the electronic motor vehicle key or in a control unit in the motor vehicle. A verification on the electronic vehicle key has the advantage that only after a successful entry of the security code is a signal of the transponder to a control unit in the motor vehicle. This has an energy-saving effect. In contrast, if a key code is sent to and verified by an in-vehicle control unit, further measures may be taken in the absence of correspondence of the transmitted signal with the code stored in the control unit, such as sending a warning SMS to the motor vehicle user.

In Preferred embodiment of the invention is provided that the User confirms the security code by entering twice. This is given a very intuitive handling of the vehicle key and errors in the input are avoided.

• – die Kontrolleinheit erzeugt nach der Verifizierung des eingegebenen Sicherheitscodes eine Zufallszahl und codiert ein gespeichertes Kraftfahrzeugschlüsselpasswort unter Verwendung der Zufallszahl;
• – die Kontrolleinheit sendet die Zufallszahl und das codierte Sperrpasswort an den elektronischen Kraftfahrzeugschlüssel;
• – das codierte Sperrpasswort wird im elektronischen Schlüssel unter Verwendung der empfangenen Zufallszahl entschlüsselt und das so entschlüsselte Sperrpasswort verifiziert;
• – im elektronischen Schlüssel wird ein weiteres Sperrpasswort codiert und an die Kontrolleinheit gesendet;
• – in der Kontrolleinheit wird das weitere Sperrpasswort entschlüsselt und verifiziert.

It is further preferred that the following steps take place before unlocking the motor vehicle doors and / or before releasing the immobilizer:

• The control unit generates a random number after the verification of the entered security code and encodes a stored motor vehicle key password using the random number;
• The control unit sends the random number and the coded blocking password to the electronic motor vehicle key;
• The coded blocking password is decrypted in the electronic key using the received random number and the thus decrypted blocking password is verified;
• - in the electronic key another lock password is encoded and sent to the control unit;
• - in the control unit, the further blocking password is decrypted and verified.

By This measure Ensures that listening to the system with the help of a Codescanner or a code grabber is made impossible.

• – mindestens eine Kontrolleinheit in einem Kraftfahrzeug mit mindestens einem Empfänger;
• – mindestens einen elektronischen Kraftfahrzeugschlüssel und/oder mindestens eine Zugangsberechtigungsvorrichtung mit mindestens einer integrierten Anzeigeeinheit, mindestens einem Sender und mindestens einer Betätigungstaste zur drahtlosen Übermittlung von Sicherheitscodes an den mindestens einen Empfänger der Kontrolleinheit.

The method according to the invention is conveniently carried out by an anti-theft system comprising the following units:

• - At least one control unit in a motor vehicle with at least one receiver;
• - At least one electronic motor vehicle key and / or at least one access authorization device with at least one integrated display unit, at least one transmitter and at least one operation key for the wireless transmission of security codes to the at least one receiver of the control unit.

It is provided that the at least one integrated display unit Means for displaying a number and / or letter Codes and the displayed code by activating the operation buttons is modifiable.

By Entering a security code on the electronic vehicle key or the access authorization device can unlock the vehicle doors and the immobilizer is released become. This will protect the vehicle from unauthorized users protected.

Thereby, that the control unit operation buttons and means for displaying a number and / or letter Codes and the displayed code by activating the operation buttons is modifiable, is advantageously achieved that for commissioning of the motor vehicle required security code of the user can be modified. He can do this modification of the security code to run as often as he for it attached holds.

Further preferred embodiments of the invention will become apparent from the others, in the subclaims mentioned features.

The Invention will be described below in an embodiment with reference to the accompanying drawings explained in more detail. It demonstrate:

1 schematically an electronic motor vehicle key according to the invention and

2 an input board of the control unit in a motor vehicle.

• 1. Der vom Benutzer eingegebene Sicherheitscode wird auf dem elektronischen Kraftfahrzeugschlüssel 100 mit einem vorgespeicherten Code verglichen. Der Sicherheitscode wird nun auf dem elektronischen Kraftfahrzeugschlüssel 100 ausgelesen und überprüft. Bei positiver Authentifizierung erfolgt eine zusätzliche Übersendung eines komplizierteren Sicherheitscodes an die Kontrolleinheit 200.
• 2. Der Schlüsselcode wird zusammen mit einem zusätzlichen mehrstelligen Code an eine fahrzeuginterne Kontrolleinheit 200 gesandt und von dieser verifiziert. Bei Übereinstimmung des übersandten Signals mit dem in der Kontrolleinheit 200 gespeicherten Code wird die Fahrberechtigung freigegeben.
• 3. Der eingegebene Sicherheitscode wird an die Kontrolleinheit 200 gesandt, worauf eine Authentifizierung erfolgt. Bei positiver Authentifizierung wird ein passendes Signal von der Kontrolleinheit 200 an den elektronischen Kraftfahrzeugschlüssel 100 zurückgesandt. Dieser sendet daraufhin ein weiteres Öffnungssignal an die Kontrolleinheit 200.

1 schematically shows an electronic vehicle key. A motor vehicle, which has a remote-controlled locking system and / or an electronic immobilizer, can by a total with 100 be designated designated electronic motor vehicle key. The main body serves as housing for a transponder and a battery. On the main body is also a push button 10 arranged by means of which the user in the three display units 12 . 14 . 16 displayed digits by pressing the pushbutton 10 can modify. The pushbutton 10 is typically designed as a company emblem. The three display units 12 . 14 . 16 may be formed as liquid crystal displays. Alternatively, they may be grouped together on a single display unit. By pressing the pushbutton 10 becomes one in the display unit 12 represented digit um 1 elevated. This is similar to selecting a letter by repeatedly pressing a button with different letter representations on a mobile phone. At a certain delay, that is, when the user presses the button 10 is not pressed during a defined time interval, the subsequent display unit 14 active and in the next step the display unit 16 , The activation of the display unit 12 could for example be indicated by the flashing of the digits. The user now gives a known only to him or a limited group of security code, which is in the present case three digits, on the electronic car key 100 one. A confirmation of the three-digit code is achieved by repeatedly entering the security code, so the user must enter the same code twice on the key. Alternatively, the confirmation can be confirmed by a long press on the pushbutton 10 respectively. For safety reasons, it is not sufficient to use only a three-digit security code as the basis of a vote with a stored in the control unit of the motor vehicle code. In that case, other vehicles exploiting the same procedure would also be able to be opened at the same time, as long as, coincidentally, the security code is congruent to them. Instead, various information transfers occur between the electronic car key 100 and the total with 200 designated control unit in question. The following cases are to be listed as examples:

• 1. The security code entered by the user is displayed on the electronic vehicle key 100 compared with a prestored code. The security code will now be on the electronic car key 100 read out and checked. If the authentication is positive, an additional transmission of a more complicated security code to the control unit takes place 200 ,
• 2. The key code is sent to an in-vehicle control unit along with an additional multi-digit code 200 sent and verified by this. If the transmitted signal matches that in the control unit 200 stored code, the driving authorization is released.
• 3. The entered security code is sent to the control unit 200 sent, whereupon authentication takes place. If the authentication is positive, a suitable signal is sent from the control unit 200 to the electronic car key 100 returned. This then sends another opening signal to the control unit 200 ,

The case mentioned under 3. requires that the control unit 200 a transmitter and the electronic vehicle key 100 additionally includes a receiver. The following is a closer look at the third case. In addition, the method is explained using the example of the unlocking of the vehicle doors. Accordingly, the method can also be used to solve the immobilizer.

In case of a negative authentication by the control unit 200 the user will be prompted by the display of an error message on the liquid crystal display 12 . 14 . 16 notified. It is also conceivable, after a certain number of incorrect information to cause an inactivation of the motor vehicle by blocking a betriebsnotwenigen control unit. The system may be configured to notify the user when a foreign user has entered the code incorrectly by sending a text message to his mobile phone.

If a match of the to the control unit 200 given security code is given with a prestored code, generates the control unit 200 a random number and encodes a stored automobile key password using the random number. The control unit 200 then sends the random number and the coded blocking password to the electronic vehicle key 100 , The key then sends out a last encrypted code signal which is in the control unit 200 decrypted and compared with another target code signal. Upon coincidence of the two signals, a control signal is sent to a controller, whereby the opening of the vehicle door is initiated. In that the electronic car key 100 has a receiver, the user can be given feedback on the state of theft system. Thus, information such as the locked state of the motor vehicle or the entry of a false security code on the display 12 . 14 . 16 being represented. Alternatively, such information could be displayed by light emitting diodes or acoustically.

2 schematically shows a control board of the control unit 200 of the motor vehicle. The device is arranged for example in the dashboard. Alternatively, it could be designed in the form of a display with menu-guided software. Via a numbered keyboard 20 can be entered by an authorized person a PIN, which is typically the current security code, wel cher is also used to open the vehicle doors. The user sees the digits entered by him on the liquid crystal display 22 , The control unit 200 is initially programmed from a system control center located at the manufacturer. Each key is provided by the manufacturer with a code that is vehicle-specific, so that with each key only one vehicle is accessible. The user can after entering the appropriate code after pressing the control button 24 modify his individual security code. He gives it the number sequence selected by him on the digit keyboard 20 and confirms its selection by pressing the control button 26 , Acceptance of the updated code is returned to the user by the system. For increased security, it may be thought; to limit the number of vehicle uses and to force the user to change the code regularly. The user will be on the liquid crystal display 12 informed about the upcoming change. The user still has the option of using the control unit 200 to disable the electronic system based on entering a security code. Thus, the vehicle doors are only by mechanical use with the help of Schlüsselbarts 18 unlocked.

100

electronic Car keys

200

control unit

10

Pushbutton / logo

12

Display Units / liquid crystal display

14

Display Units / liquid crystal display

16

Display Units / liquid crystal display

18

bit

20

digit keypad

22

Display Units / liquid crystal display

24

Control buttons

26

Control buttons

Claims (7)

Method for starting up a motor vehicle by means of an electronic motor vehicle key ( 100 ) and / or an access authorization device, wherein on the electronic vehicle key ( 100 ) and / or on the access authorization device by the user a security code is entered and upon successful verification, the vehicle doors are unlocked and / or the immobilizer is released. A method according to claim 1, characterized in that the verification of the entered security code on the electronic vehicle key ( 100 ) he follows. Method according to claim 1, characterized in that that the verification of the entered security code in one Control unit in the vehicle takes place. Method according to one of the preceding claims, characterized characterized in that the user the security code by two times Input confirmed. A method according to any one of claims 3 and 4, characterized that before unlocking the vehicle doors and / or before releasing the immobilizer following steps take place: - generates the control unit after verification of the entered security code, a random number and encodes a stored vehicle key password using the random number; - the Control unit sends the random number and the coded lock password to the electronic car key; - the coded lock password will be in the electronic key decrypted using the received random number and the thus decrypted lock password verified; - in the electronic key another lock password is encoded and sent to the control unit Posted; - in the control unit is decrypted the further lock password and Verified. Anti-theft system comprising: - at least one control unit ( 200 ) in a motor vehicle having at least one receiver, - at least one electronic motor vehicle key ( 100 ) and / or at least one access authorization device with at least one integrated display unit, at least one transmitter and at least one actuating key for the wireless transmission of security codes to the at least one receiver of the control unit, characterized in that the at least one integrated display unit ( 12 ) Comprises means for displaying a code consisting of numbers and / or letters and the displayed code is modifiable by activating the operation keys. Anti-theft system according to claim 1, characterized in that the control unit ( 200 ) Comprises operation keys and means for displaying a code consisting of numbers and / or letters, and the displayed code is modifiable by activating the operation keys.