SK8428Y1 - Device for protecting a vehicles with a keyless system - Google Patents

Abstract

Device for protecting a vehicles with a keyless system consist of an electronic chip (3) with a motion sensor for disconnecting the key (1) electronics from the battery (2) which is incorporated into the vehicle key (1). The electronic chip (3) is provided with an algorithm for detecting the movement of the key (1) to prevent the key (1) from being misused. The electronic chip (3) is non-destructively embedded in the key (1) for controlling the vehicle and can be removed at any time and key (1) in its original state.

Description

Technical field

The technical solution relates to the modification of the electronic key of motor vehicles equipped with a keyless system in order to increase the protection of the vehicle against unauthorized entry into the vehicle or theft itself.

BACKGROUND OF THE INVENTION

Motor vehicles, especially the more luxurious brands, use a large number of electronic support systems (simple to convert users) to the vehicle. One of them is the KESSY (Keyless Entry Start and Exit System), which is used for comfortable vehicle operation. The system wirelessly recognizes an authorized user, enabling him to unlock the doors, start the vehicle and lock the vehicle without the need to operate the remote control key and insert it into the vehicle's ignition switch. However, this system carries a great security risk that developers have discovered and constructed a device that is designed to open and possibly steal a vehicle. This device, called QKey Keyless Scaner or Keyless range extender, can be ordered and purchased online.

The basic principle of the KESSY keyless system is based on a pair of radio communication channels between the key and the vehicle. The vehicle is equipped with several antennas for communication from vehicle to key. The antennas are located outdoors, such as door handles, exterior mirrors, and the interior of a vehicle. Usually this is a transmission at 125 kHz due to the simple realization of limited range within a few meters of the vehicle and receiver in a key with very low power consumption. Transmission from the vehicle to the key occurs, for example, on the basis of a stimulus, usually by touching the handle or by pressing the engine start button. The key command is sent through the antenna inside and outside the vehicle. Based on the initiative to verify and receive a command from the vehicle's interior or exterior antennas, the system detects whether the key is inside or outside the vehicle. The key-to-car response is usually in the 434 or 868 MHz band. This channel is also used to control the central locking by pressing the corresponding key on the key. The operating range is several tens of meters.

The system operates autonomously, without any user control. By touching the handle, the vehicle sends a command to a key, for example in the user's bag, receives the authorized key, responds to the vehicle with a second radio channel and unlocks the door. Similarly, inside the vehicle, when you press the START button, the vehicle sends a key command that responds and activates the engine.

KESSY extender is a device that significantly extends the range of communication between the vehicle and the key, especially the channel from the vehicle to the key, usually at 125 kHz, from meters to tens of meters. Vehicle theft using the KESSY extender is documented by images from industrial cameras on the Internet. These are usually very expensive vehicles of reputable brands. KESSY extender consists of 2 units, the first is located near the vehicle, the second closest to the vehicle key, at the owner, usually within 500 m of the vehicle. When the handle is touched, the vehicle sends a signal to a key that is outside the vehicle's standard range, which is received by the extender unit of the vehicle, converted to another signal, and transmitted over a long distance to the other extender unit. A second extender unit located within a few meters of the key, at a distance of, for example, 200 meters from the vehicle, receives the signal from the first extender unit and converts it back to the same signal that the vehicle transmits. The key recognizes the correct vehicle signal and responds to other radio channels, typically 434 or 868 MHz. The second extender unit intercepts the signal, converts it again to another signal, transmits it back to the first extender unit at the vehicle, and converts it to the original key signal, typically 434 or 868 MHz. This successfully completes the authorization process and unlocks the vehicle, pressing the START button repeats everything, starts the engine, and can start the vehicle in seconds. Some vehicles check the presence of the key in the cab under certain conditions when the engine starts. If the vehicle detects that the key is missing, it will display a message on the vehicle display, but the engine will never be stopped for safety reasons. The stolen vehicle will go to the place where the computer is electronically programmed, new keys recorded and then used as standard.

The advantage of extender is the possibility to significantly increase the reach of the first channel between the extender and the key, usually 125 kHz, from a distance of several meters to several tens of meters. This will allow abuse of keys located inside the object by extender located outside the object.

The extender can transmit and amplify only the first channel, usually 125 kHz. The second return channel, usually 434 or 868 MHz, does not have to be used, a key within a few tens of meters directly controls the unlocking and starting of the vehicle.

The advantage of the bidirectional extender is the range usually up to 500 m, depending on the design and propagation conditions. The range of the unidirectional extender is limited by the range of the vehicle remote control to a distance of approximately 100 m, depending on conditions.

S K 8428 Υί

In developing vehicle remote control systems, automakers use state-of-the-art encryption algorithms to ensure radio transmissions, such as floating coding. However, the extender does not encode, decode or amplify the signals. The principle of extender was probably completely ignored by car manufacturers in the development of radio authorization systems.

Theft of vehicles in this way has been known for several years, yet some luxury vehicles have not been protected to date and some have been stolen by extenders. It will be very difficult for car makers to adapt the system to be resistant to similar types of attack.

The essence of the technical solution

The above-mentioned drawbacks are eliminated by a vehicle / key system protection device according to this technical solution, which consists in that an electronic chip with a motion sensor is integrated into the vehicle electronic key. The chip detaches the key electronics from the programmed motion detection algorithm. energy - batteries. In the mode where the key electronics are disconnected from the battery, it is not possible to carry out any authorization with it and thus cannot be misused to steal the vehicle by means of the extender. In standard mode of use, coming to the vehicle, unlocking, starting the engine, the key is in motion and the key electronics are connected to the battery by a chip. The chip will only protect the key from misuse when the key is not in motion, which is the most common misuse. The vehicle is stolen at night when it is parked in front of the house, the key is inside the house, for example, in a key box. Less common thefts with the extender take place when the authorized user leaves the vehicle. In this case, the battery of the chip is connected to the key and can be stolen using an extender. This is a disadvantage of the proposed solution, in any case the perpetrators are trying to be inconspicuous, not to be in the vicinity of the owner of the vehicle, so theft without witnesses prevails at night.

The chip is powered by the battery of the key. Another advantage of the proposed solution is to save battery power and thus extend its battery life. Room power consumption of the key is higher than that of the embedded chip. In non-moving mode, therefore, the power consumption is lower, leading to an extended battery life of the key.

Most motor vehicle keys from different manufacturers have different shapes. The keys have different batteries, most lithium button cells are used worldwide. The mechanical design of the key is designed as a miniature, mechanically and climatically resistant case with the requirement for user replacement of the battery. The electronics in the key are usually glued, except for the battery replacement part, the key cannot be disassembled without destruction. One way to build the chip into the key is to play it and connect it to the original key electronics, which is not advantageous, see the previous description. At the same time, the destructive disassembly and composition of the key could lead to a breach of climate resistance and a loss of warranty on the key itself, in some cases on the car. The proposed solution is based on the requirement for minimal, non-destructive and reversible key intervention.

There is another uncomfortable solution on the market. The user uses a conductive key case that creates a shield that prevents the radio signal from passing. Before each use of the key it is necessary to remove it from the package or open the package. After use, re-seal the key in the package. Another variant of the described solution is a metal box, usually placed in the building of the owner, after entering the house puts the key in the box and closes. But this solution is also uncomfortable.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution will be explained in more detail by means of the drawing, where FIG. 1 shows the location of the individual elements of the device.

EXAMPLES

The electronic chip 3 is made to form a very thin housing, package, battery 2 of the key 1. The design and installation of the electronic chip 2 is to maintain the vehicle control key 1 without any mechanical and electronic modifications. Possibility of replacing the battery 2 without damaging the electronic chip 3. The electronic components 5 of the chip, the motion sensor, the microprocessor and the small passive components are located on the top or bottom of the battery 2 of the key 1 or 1 for controlling the vehicle. The electronic components 5 are protected on the circuit board of the chip 4 and mechanically fixed by a suitable adhesive. The circuit board 4 is designed to break the conductive path between the battery 2 of the key 1 and the electronics 6 of the key. The interconnection of the battery 2 of the key 1 and the electronics 6 of the key 1 will be based on the electronic chip algorithm 3, according to the detection of the movement of the vehicle control key 1.

The design of the electronic chip 3 as part of the battery 2 requires, while maintaining the dimensions of the original battery 2, to use a different type of battery 2, smaller in size, with a smaller capacity and to incorporate the electronics of the chip 3 into the space. key 1 leads to a reduction in its service life. Another variant may be a completely compact battery 2 with built-in electronic chip 2. The advantage of the solution is completely universal use, the disadvantage is the complete replacement of the whole when the battery 2 is discharged.

The electronic chip 2 consists of a very thin and flexible printed circuit board 4 and electronic components 5. The electronic chip 2 is part of a vehicle control key 1. The electronic chip 2, its electronic components 5, are located on the battery 2 of the key 1, as allowed by the particular mechanical design of the vehicle control key 1. The electronic components 5 are on the top or bottom of the key 1 battery 2, they may be outside the key 1 battery. If there is not enough space in the key 1 to operate the vehicle, the lower key 1 battery and the electronic chip 2 are built into the free space. The electronic chip 2 disconnects the power supply 6 of the key 1.

Industrial usability

The technical solution of vehicle protection with a keyless system against attack according to the present solution can be used in the automotive industry to protect the vehicle against attack, unauthorized entry into the vehicle or theft of the vehicle itself.

S K 8428 Υί

List of vehicle key reference numbers Battery key

3 electronic chip PCB chip electronic components chip electronics key

Claims (4)

PROTECTION REQUIREMENTS Device for protecting vehicles with a keyless system, characterized in that an electronic chip (3) with a motion sensor for disconnection is integrated in the vehicle control key (1). 5 key electronics (1) from the battery (2). Vehicle protection device with keyless system according to claim 1, characterized in that the electronic chip (3) embedded in the vehicle control key (1) is provided with an algorithm based on detecting the movement of the key (1) to prevent misuse of the key (1). 1). Vehicle protection device with keyless system according to claim 1, characterized in that the electronic chip (3) is non-destructively integrated into the vehicle control key (1). Vehicle protection device with keyless system according to claim 1, characterized in that the electronic chip (3) is designed as part of a battery (2).