RU180337U1 - Electronic device to protect the vehicle from theft - Google Patents

Abstract

The utility model relates to parts of additional equipment of vehicles (TS), namely to parts of car alarms, immobilizers and other electronic and / or electromechanical devices, one of the functions of which is anti-theft protection. The electronic device for protecting the vehicle from theft contains a microcontroller 2 having a data processing unit from the CAN bus 22 and a relay 3 of any type connected to the microcontroller 2 (an electromechanical relay, an electronic relay, a repeater on a logic circuit, etc.) designed to break or vice versa, bypassing any circuit (s) of the vehicle. Receiving a command to block the movement of the vehicle from the control unit of the security device via the CAN bus, the microcontroller 2 puts the built-in relay 3 into the “locked” position. Upon receipt of a command to permit movement, the microcontroller 2 puts the built-in relay 3 in the "unlocked" position. The device may include a built-in non-volatile memory 21, an accelerometer 4, as well as input 5 for connecting to the ignition circuit. The device allows to increase the reliability of theft protection and reduce the likelihood of the need to adapt the device to new vehicles.

Description

The utility model relates to parts of additional equipment of vehicles (TS), namely to parts of car alarms, immobilizers and other electronic and / or electromechanical devices, one of the functions of which is anti-theft protection.

As is known from the state of the art, one of the ways to prevent theft of a car is to interrupt any electrical circuit necessary for the operation of the engine and / or the movement of the vehicle. Devices designed to break electrical circuits are collectively referred to as “relays” although, in many cases, they are complex electronic circuits and do not necessarily include an electromechanical relay. With all the variety of designs available on the market, each has certain drawbacks, some of which are described in the patent for utility model RU 152901 U, published on 06/20/2015 [1]. This patent describes an electronic device for protecting a car from theft, comprising a housing in which a microprocessor is located, connected to a connector for powering it installed on the housing, and having a connector for connecting the microprocessor to the vehicle's CAN bus, the microprocessor having a data reading module from the bus The CAN of the vehicle corresponding to the launch of the vehicle’s power units, as well as the microprocessor has a data generation module in the vehicle’s CAN bus corresponding to the stop of the vehicle’s power units. The device is connected to the CAN bus of the vehicle and blocks the movement by transmitting signals to the CAN bus that do not allow the vehicle to move. The device described in the patent is closest in its technical essence to the claimed utility model.

The disadvantages of the known device [1] logically follow from its advantages. In particular, not all vehicles have CAN commands in the CAN bus that can stop the vehicle moving, and some vehicles do not allow the engine to be blocked through the CAN bus while driving, but put its operation in emergency mode. Thus, the goal - blocking movement - is not achieved. In addition, the technical implementation of the known device [1] is possible only after serious research work with each vehicle model separately, which translates into a high price for the end user and makes it difficult to wide market vehicle.

Despite the disadvantages of physical blocking of vehicle circuits described in the patent [1], this method is overwhelming in modern anti-theft systems because it guarantees blocking of movement in the absence of communication via the CAN bus. The hijacking methods described in the patent [1] using diagnostic equipment, an oscilloscope, and other specialized devices are not the most common due to the high qualification requirements of the hijacker.

The objective of the utility model is to create a miniature vehicle traffic blocking device that reliably communicates with the control unit of the security device via the standard CAN vehicle bus while reducing the cost of equipment.

The technical result of the utility model is to increase the reliability of car anti-theft protection due to the fact that the device makes it impossible to transmit a signal in the vehicle circuit (s) necessary for its movement, as well as to reduce the likelihood of the device having to adapt to new vehicles.

The technical result is achieved in that the electronic device for protecting the vehicle (TC) from theft, containing a microcontroller having a data processing unit from the CAN bus, according to the technical solution, is equipped with a relay connected to the microcontroller for breaking or shunting the vehicle circuit.

In addition, the microcontroller can be connected to the input (input circuit) for connection to the vehicle ignition circuit with the possibility of triggering the relay when the vehicle starts operation in the absence of communication via the CAN bus.

In addition, the microcontroller can be connected to an accelerometer with the possibility of providing a relay only after the vehicle starts to move

In addition, the device may have a USB connector for updating firmware.

In addition, the microcontroller can be configured to provide a relay based on indirect signs of theft in the absence of communication via CAN bus with the control unit of the vehicle security device.

The drawing shows a diagram of the proposed device.

The electronic device for protecting the vehicle from theft contains a microcontroller 2 having a data processing unit from the CAN bus 22 and a relay 3 of any type connected to the microcontroller 2 (an electromechanical relay, an electronic relay, a repeater on a logic circuit, etc.) designed to break or vice versa, bypassing any vehicle circuit (s), for example, chains of crankshaft position sensors. The device has terminals 6 for connecting power. Receiving a command to block the movement of the vehicle from the control unit of the security device via the CAN data bus, microcontroller 2 sets the built-in relay 3 to the “locked” position. Upon receipt of a command to permit movement, the microcontroller 2 puts the built-in relay 3 in the "unlocked" position. All responsibility for identifying the owner lies with the control unit of the vehicle security device, which implements certain algorithms. The non-volatile memory 21 built into the microcontroller 2 allows the device to remember its previous state even when the battery is disconnected, which eliminates the possibility of disabling the lock by manipulating the power. Exchange on the CAN bus is two-way encrypted to prevent the attacker from replacing the control unit. The device does not have a connector and a pronounced case, which minimizes its size for installation inside the vehicle wiring harness. To protect electronic components from external influences, a heat-shrink tube, widely used in technology, is used, which is an inexpensive and reliable protection for miniature devices. It is also possible to encapsulate the device by filling it with a compound, although this solution is less preferable, because eliminates the possibility of repair.

There is a variant of the utility model in which the microcontroller 2 of the device has an input connected to the ignition circuit of the vehicle (or similar in properties) to establish the fact of the start of operation of the vehicle with the CAN bus blocked. In this case, the absence of communication via CAN bus with the control unit of the vehicle security device allows us to assume a high probability of theft and forcefully block the movement.

There is a variant of the utility model in which the device comprises an accelerometer 4 (one, two or three-axis) connected to the microcontroller 2, which allows the vehicle to be blocked only after its start, to reduce the possibility of detecting a lock, even if the information in the CANo bus is in motion absent.

There is a variant of the utility model in which the device contains a built-in USB connector (not shown in the diagram) designed to update the firmware of microcontroller 2, which allows you to adapt already released devices to new vehicles directly to the installer without sending the device to the manufacturer for reflashing. This option is essential for countries with a large territory and is simply indispensable for export deliveries.

A variant of the utility model is also possible, in which, in the absence of communication via CAN bus with the control unit of the vehicle’s security device, the microcontroller independently decides to interrupt the vehicle circuit (s) based on indirect signs of theft, such as, for example, the start of a car’s movement despite the last The security system received by the microcontroller was “on guard”.

A miniature vehicle motion blocking device is provided, which provides reliable communication with the control unit of the security device via the standard CAN vehicle bus. One of the main drawbacks of existing relays is eliminated in the device - an unreliable, noticeable or expensive line of communication between the blocking relay and the control unit of the security device and, at the same time, the disadvantage of the closest utility model is eliminated [1] - inoperability with the CAN bus blocked. The disadvantage associated with the need for significant research is eliminated by the fact that for the use of the device of the proposed design, a simple CAN bus diagnostics is sufficient to establish the used address space to avoid duplication of addresses. Thus, the development of the device is much cheaper than the known device [1], and for many new vehicles appearing on the market it may not require improvements.

The proposed device can be manufactured in practice at the existing level of technology. Moreover, the applicant has manufactured and tested various versions of the proposed device, in particular, the “CAN-relay Implant 1A (2 × 3)” based on the STM32F303CCT6 microcontroller from STM and the electromechanical relay IM06GR manufactured by TE Connectivity.

The manufactured device fulfilled all the declared functions (in the version without an accelerometer). Variants with an accelerometer were not made, however, the applicant, like a number of other companies, has in its assortment relays equipped with accelerometers, which allows us to talk about the fundamental possibility of manufacturing a device with all the declared functions.

Claims (4)

1. An electronic device for protecting the vehicle (TC) from theft, containing a microcontroller having a data processing unit from the CAN bus, characterized in that it is equipped with a relay connected to the microcontroller to open or bypass the TC circuit, and the microcontroller is connected to an input circuit for connection to the ignition circuit of the vehicle. 2. The device according to p. 1, characterized in that the microcontroller is connected to the accelerometer with the ability to ensure the relay is triggered only after the vehicle starts to move. 3. The device according to p. 1, characterized in that it includes a USB connector. 4. The device according to p. 1, characterized in that the microcontroller is configured to provide a relay based on indirect signs of theft in the absence of communication via CAN bus with the control unit of the vehicle security device.

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