RU116107U1 - VEHICLE CAN-BUS MODULE OF THE VEHICLE ALARM SYSTEM - Google Patents

Abstract

1. CAN-bus module of the vehicle alarm system, containing an open-frame printed circuit board with electronic circuitry, including a control microcontroller, and connection connectors in the form of contact groups, made with the possibility of their installation on the standard connectors of the alarm system board, characterized in that The printed circuit board is made with a one-sided arrangement of the electronic circuit and connection connectors with the possibility of its installation on the board of the security alarm system from the side of the electronic circuit. ! 2. The CAN bus module according to claim 1, further comprising a flash memory connected to the control microcontroller with an encrypted database about the supported control functions and the structure of the CAN bus packets of the serviced model range of vehicles. ! 3. The CAN bus module according to claim 1, characterized in that the printed circuit board is additionally equipped with technological connectors in the form of contact pads, made with the possibility of performing self-testing, debugging and updating the software preinstalled in the control microcontroller of the electronic circuit located on the opposite side the location of the connection connectors. ! 4. CAN-bus module to any one of claims 1, 2 or 3, characterized in that it is additionally equipped with self-resetting fuses, made with the possibility of overload protection, alternative outputs to lighting equipment and locks. ! 5. CAN-bus module according to any one of claims 1, 2 or 3, characterized in that the connection connectors are additionally equipped with contacts, so

Description

Technical field

The utility model relates to the electrical equipment of vehicles, namely to means for connecting an alarm to the vehicle’s CAN bus for coordinating with it on a software and hardware level and transmitting data organized on a standardized CAN protocol.

The declared CAN bus module of the security alarm system (car alarm) is designed to connect additional systems to the standard wiring of the car without violating its integrity and performance, allowing you to receive the necessary signals in digital form from the standard wiring, convert them to an analog or pulse format suitable for registration with an additional device, and also, if necessary, generate and submit digital commands to it from the installed additional device.

State of the art

One of the most common options for connecting alarm systems to the CAN bus is the use of external CAN modules made in a separate housing (for example, the universal CAN adapter CAN-ART-A of the tuning center "AGT" (Moscow, http: //www.agt-company.ru/tu_eg_1_1), FALCON CAN-02 digital bus adapter for the Mega-F Capital company (Moscow, http://www.mega-f.ru/ru/product/service_device / can / can-02 /), adapters of the AUTOCAN series LLC "TEK Electronics" (Moscow, http://www.tec-electronics.ru/page.html?p=18&id=0). Among the disadvantages of this kind decisions should include an increase in the number of additional installed equipment and the increasing dimensions of the security complex, consisting of a security alarm system and an external module of the CAN bus adapter, which complicates the possibility of covert installation of the complex in a vehicle, thereby reducing its security capabilities. requires the use of additional circuit solutions providing for the possibility of matching the adapter with a security alarm system installed on the transport means that limits the full functioning of the CAN bus module and the alarm system as a whole.

A solution is known of a device for adapting a vehicle alarm system with a vehicle CAN bus, comprising a CAN module in a housing with terminals for connection to an alarm system, designed to be installed inside the alarm system housing, where said CAN module housing is a removable module housing memory, either in a Compact Flash (CF) package with analog outputs or Secure Digital (SD) with a standardized open serial protocol (RF patent for utility model No. 90746, RF patent for invention No. 2415766 (TEK Electronics LLC, Moscow). Among the disadvantages of this solution are the above for similar separate solutions of adapters made in a separate building, the need to use additional measures to coordinate it with a security alarm system installed on vehicle, which limits the full functioning of the CAN bus module and the alarm system as a whole. The specified format of the removable memory module does not allow for the use of additional contact pads in addition to standardized ones, which also limits the capabilities of the system as a whole. In addition, the ability to install a removable memory module in the housing of the security alarm system unit directly by the user, according to the information disclosed in the patents, creates prerequisites for violating the integrity of the circuitry of the security alarm unit and the abnormal installation of the adapter, which can negatively affect the stability of its operation.

The closest analogue in terms of the set of essential features of the claimed utility model, selected as a prototype, is the solution of the integrated (built-in) removable CAN bus module of the vehicle alarm system of the StarLine A62 Dialog CAN Flex vehicle (StarLine LLC), known from an open publication on the Internet , St. Petersburg http://www.ultrastar.ru/16640/13318) consisting in the fact that the CAN bus module is made in a package without a case in the form of a double-sided printed circuit board equipped with an electronic circuit with a control microcontrol on the one hand and on the other side of the module board, connectors for connecting to the car alarm board in the form of contact groups of pin connectors installed on the standard car alarm card connection connectors. Using a vehicle alarm system with an integrated CAN bus module allows you to connect a car alarm directly to the vehicle’s digital CAN bus, without increasing the number of installed devices and the overall dimensions of the security complex as a whole. In addition, the integrated CAN bus module can significantly reduce interference with standard wiring, as well as avoiding the need to coordinate the alarm system with the device of the CAN bus adapter module, since this module is an integral part of the circuitry of the car alarm unit. A disadvantage of the known device is that the printed circuit board of the CAN-bus module is double-sided, with the electronic circuit and connection connectors spaced on opposite sides in such a way that when the board is installed in the alarm system unit, the electronic circuit with radio elements is located in close proximity to the housing, which can lead to damage to its integrity during operation as a result of a circuit shock on the housing, as well as instability due to possible interference and interference, causing GOVERNMENTAL close proximity of the housing elements and elements of the electronic circuit. As a result of the foregoing, this design requires the additional use of a protective casing or shielding to reduce the negative impact of external factors on the module's performance.

Utility Model Disclosure

The objective of the utility model is to expand the arsenal of tools and develop a frameless CAN bus module that is easy to manufacture and assemble, without increasing the overall dimensions of the vehicle's alarm system, with the possibility of connecting additional electronic systems to the standard wiring of the car without violating its integrity and performance, as well as without the need for additional coordination of the CAN bus module with the burglar alarm system.

The technical result achieved by the claimed utility model is to increase the manufacturability of the production of CAN bus modules while reducing the cost of production, reducing the complexity of manufacturing a CAN bus module, increasing the manufacturability of working with it and the car alarm system as a whole, as well as improving noise immunity, reliability and increasing the service life of both the CAN bus module separately and the alarm system as a whole.

The claimed technical result is achieved by using the CAN-bus module of the vehicle alarm system containing an open-circuit printed circuit board with an electronic circuit including a control microcontroller, and connection connectors in the form of contact groups made possible to install them on the standard connectors of the alarm system board . At the same time, the claimed solution of the utility model differs from the prototype in that the printed circuit board is made with a one-sided arrangement of the electronic circuit and connection connectors, providing the possibility of surface mounting by automatic soldering and installation of the alarm system on the circuit board from the electronic circuit. At the same time, the electronic circuit additionally contains a flash memory connected to the control microcontroller with a database in encrypted form about the supported control functions and the CAN packet structure of the served vehicles. Whereas, the CAN bus module connection sockets are additionally equipped with contacts connected to the USB connector, and also contain connector contacts made with the possibility of indicating the status of a standard security system.

The CAN bus module is additionally equipped with self-resetting fuses designed to provide protection against overload, for example, alternative outputs to lighting equipment and locks.

In a preferred embodiment of the utility model, the printed circuit board of the CAN bus module is additionally equipped with technological connectors in the form of contact pads made possible to carry out self-testing, debugging, and software updates pre-installed in the control microcontroller of the electronic circuit located on the side opposite to the location of the connection connectors.

Brief Description of the Drawings

The utility model is illustrated by drawings, where

figure 1 is a General view from the side of the printed circuit board with an electronic circuit and connectors;

figure 2 is a General view from the side of the printed circuit board with technological connectors;

figure 3 is a structural diagram.

It should be noted that the accompanying drawings illustrate only one of the most preferred embodiments of the utility model, and therefore cannot be considered as limitations on the content of the utility model, which includes other embodiments.

Utility Model Implementation

As follows from the drawings of a general view (Figs. 1 and 2) and a block diagram (Fig. 3), the CAN bus module is structurally designed in a housing-free version based on a printed circuit board, for example, on an electronic circuit board measuring 28.6 × 21.75 mm, designed for mounting on alarm board using a detachable connection, with a one-sided arrangement of the electronic circuit 1 and the connectors 2 connected to it via the wiring diagram to the standard connectors of the alarm system circuit board (not shown in the figures). The functionality of the CAN bus module is supported by an electronic circuit based on a control microcontroller 3 connected via a circuit board of a printed circuit board to at least flash memory 4, chip 5 of the CAN bus physical layer driver, the power of which is supported by microchips 6 food. Analog outputs 7 for central locking and alarm control are equipped with self-resetting fuses 8 designed to protect against overloading of alternative outputs to the lighting system and locks.

Connectors 2 connections, made, in particular in the form of pin connectors, are located on the side of the electronic circuit and grouped according to their functional purpose. The placement of the connectors 2, installed in the holes in the printed circuit board, and the electronic components of the electronic circuit 1 on one side allows you to automatically solder the connectors on the selective wave soldering installation, which significantly reduces the time required to install the connectors, significantly reducing the cost of manufacturing modules and allowing you to make the production process more technological. In the prior art version of the double-sided arrangement of mounting elements and connection sockets, the process of installing connectors was carried out manually due to the inability to automatically solder at high density layout of the electronic circuit of the printed circuit board, which created problems in the mass production of CAN-bus modules for security alarm systems funds.

The connectors 2 are connected to the terminals of the control microcontroller 3, the chip 5 of the physical layer driver of the CAN bus, the analog outputs 7 of the central locking and alarm control, as well as the standard sensors of the vehicle security alarm system. At the same time, the connection sockets contain connection pins 9 to external sensors that ensure the alarm system is operational, and additionally contain contacts 10 connected to the USB connector, as well as contacts 11 made with the possibility of indicating the status of the standard security system.

On the second side of the printed circuit board there are pads 12, which are technological connectors for debugging and updating software pre-installed in the control microcontroller of an electronic circuit that ensures the module is operational. At the same time, technological connectors provide the possibility of implementing the self-testing function in production, which allows functional control after assembly of printed circuit boards, reducing the percentage of defects in the production process.

The control microcontroller 3 is designed to perform the conversion of CAN messages to logical levels, process data and issue control messages. At the same time, as a control microcontroller 3, for example, any 32-bit microcontroller known from the prior art can be used, for example, with an ARM Cortex-M3 core (manufactured by ST Microelectronics) operating at a frequency of up to 72 MHz.

Chip 5 of the physical layer driver for the CAN bus is designed to convert the logical levels of the control microcontroller 3 into CAN levels with minimal EMI electromagnetic interference. The driver in this embodiment of the utility model can support the most common CAN standards - High Speed (ISO 11898-2) and Single Wire (SAE 2411) and can be implemented on the basis of the TJA1042 high-speed CAN transceiver (manufacturer - NXP), which provides data transfer between CAN controller and two-wire bus.

Flash memory 4 is used to store the database of vehicles of various manufacturers in an encrypted form and, in general, contains information about the supported control functions, message sending algorithms and the structure of CAN bus packets. It can, in particular, be implemented on the basis of any internal solid state drive, for example, SST25VF016B with a capacity of 2 MB (manufacturer Microchip).

Depending on the specific vehicle model in the CAN bus, it may not be possible to implement certain functions. In this case, it is necessary to use the usual connection of circuits, the monitoring and control of which are realized by means of alternative analog outputs 7 ALT, which in the considered embodiment of the utility model are outputs for controlling the central lock and alarm.

The USB interface is designed for convenient and quick updating of the database and firmware of the CAN bus module, as well as settings for the CAN bus module (selecting a car model, turning control functions and status functions on and off). CAN bus modules can be connected to a computer via an adapter and / or directly to a USB port. At the same time, installation of drivers is not required when connecting, since the class of USB HID devices is programmatically implemented in the control microcontroller, which does not require drivers in the system, which simplifies connecting the module to a USB connector. In addition, the CAN bus module was integrated into the alarm system at the stage of its installation on the alarm system board in the assembly process at the factory, and the software selected from the driver database serviced by this vehicle module preinstalled on the flash memory is implemented through technological connectors during the production process and do not require further user intervention in the installation of additional drivers. While the software update can be carried out by the end user independently, without connecting to specialized equipment, by directly connecting to the USB connector. Thus, the proposed design of the CAN bus module by increasing the manufacturability of the assembly process, due to the design features, allows you to optimize the costs associated with its production, eliminating the cost of providing service centers with equipment for updating the software.

In the considered embodiment of the utility model, the input contacts of the connection connector 3 provide, in particular, information from the standard sensors of the system, characterizing, for example:

- Engine operation (on / off);

- Status of limit switches for doors, hood and trunk;

- The work of the standard alarm (in protection / not in protection);

- The condition of the ignition system;

- Position of the brake pedal;

- Position of the hand brake.

The output contacts of the connection connector 3, at least, provide the transmission of the following control messages:

- Open the central lock;

- Close the central lock;

- Unlock the boot:

- On alarm management.

To provide power to all components of the electronic circuit (control microprocessor, flash memory, CAN driver), voltage converters (linear regulators) are installed on the CAN bus module board. At the same time, the DC voltage of the module ensuring its operability, in the considered embodiment of the utility model, is 12 V.

The CAN bus module of the vehicle alarm system according to the utility model operates as follows.

The CAN bus module is installed on the standard connectors of the alarm system board in such a way that the electronic circuit and the connection connectors made in the form of pin contacts are turned towards the alarm board, and the reverse side of the printed circuit board of the CAN bus module with technological connectors is facing the case. During the assembly process, through the process connectors, the software necessary for servicing the vehicle is installed and debugged.

At the end of the alarm system assembly process, the enclosure, with the CAN bus module installed inside, is closed. At the same time, since the CAN bus module board is installed on the standard connectors of the alarm board, a change in the overall dimensions of the body of the alarm system block is not required.

When power is supplied to the car security system, the device starts by loading from the memory a subroutine serving the previously set car model. Subprograms for different cars are stored in non-volatile flash memory in encrypted form, and the number of the required program is stored in non-volatile memory of the control microcontroller.

The subroutine selection (installation of the vehicle model) and the module are configured during the installation of the module in the car in two ways:

- using the service button of the car alarm

- via USB, while for connecting to a USB device does not require installation of drivers.

After loading the subprogram, its execution is initialized. The device analyzes the information on the CAN-bus of the car and provides the corresponding signals to the digital outputs. Upon receipt of commands from the control microcontroller in the form of potentials of the corresponding level on their input data lines, the CAN module, in turn, generates command messages designed to control the specified devices of the car (side lights, central locking, etc.).

Thus, it is obvious that the solution of the CAN bus module of the vehicle security alarm system, according to the claimed utility model, due to the design with a one-sided arrangement of the electronic circuit and the connection connectors, as well as the inclusion of additional contacts of the connection connector for connecting to the USB port in the design and the presence of flash memory with a pre-installed database in encrypted form about the supported control functions and the structure of CAN bus packets of the serviced model range of vehicles with This means that it is possible to increase the manufacturability of CAN-bus modules production and work with it, due to the possibility of automatic pin soldering of connectors and the possibility of connecting to a USB connector, providing the ability to update software without the use of special devices and additional installation of specialized drivers for matching the CAN module with a security system alarm. At the same time, it reduces production costs, the complexity of manufacturing a CAN bus module, improves the manufacturability of working with it and the car alarm system as a whole, improves noise immunity, reliability of operation and increases the service life of both the CAN bus module separately and the security alarm system as a whole , due to the lack of contact of electronic components with housing elements, when it is installed in the alarm system.

Claims (5)

1. The CAN bus module of the vehicle security alarm system, comprising an open-circuit printed circuit board with an electronic circuit including a control microcontroller, and connection connectors in the form of contact groups made possible to be installed on the standard connectors of the security alarm system board, characterized in that the printed circuit board is made with a one-sided arrangement of the electronic circuit and the connection connectors with the possibility of its installation on the alarm system circuit board from the electronic side electronic circuitry. 2. The CAN bus module according to claim 1, characterized in that it further comprises an encrypted flash memory connected to the control microcontroller with a database of the supported control functions and the packet structure of the CAN bus of the serviced vehicle range. 3. The CAN bus module according to claim 1, characterized in that the printed circuit board is additionally equipped with technological connectors in the form of contact pads made possible to perform self-testing, debugging, and software updates preinstalled in the control microcontroller of the electronic circuit located on the opposite side the location of the connectors. 4. CAN bus module to any one of claims 1, 2 or 3, characterized in that it is additionally equipped with self-resetting fuses made to provide overload protection, alternative outputs to lighting equipment and locks. 5. CAN bus module according to any one of claims 1, 2 or 3, characterized in that the connection connectors are additionally provided with contacts connected to the USB connector.