7.13. Immobilizer
The system of an immobilizer is composed of the passive receiver-transmitter (for a mutual identification) when block of SMARTRA (Antenna of INTELLIGENT Receiver-transmitter) got on a head of key of the car and the antenna.
The block of SMARTRA includes the built inductive antenna and electronic schemes joined the switch of ignition. The block of SMARTRA joins the unity of control of the motor of the line of special communication.
Such a way of the control of the block of SMARTRA is the most expedient thing like the unity of control of the motor the launch of the motor makes working.
Beginning of action of system
The system of an immobilizer includes the unity of control of the motor, the block of SMARTRA and the receiver-transmitter that is built in the ignition key.
The unity of control of the motor executes an identification of key of ignition through the algorithm of special codification that works in the parallel one in the receiver-transmitter and the unity of control of the motor. The launch of the motor is possible only in the coincidence of results of the action of an algorithm. The data of all the receivers-transmitters annexed to the car are guarded in the memory of the unity of control of the motor.
The unity of control of the motor and the block of SMARTRA is informed between them in the line of special communication. During the action of this communication between the unity of control of the motor and SMARTRA to line "K" the unity of control of the motor of other types of the communication do not be able to use, the unity of control of the motor establishes the connection in the line "K" with the block of SMARTRA, or with other devices (for example, with the experience device in the moment of the maintenance) being lit of the multiplexador and the launch of special proceedings of the communication. The multiplexador — a part of the hardware of the unity of control of the motor. The block of SMARTRA executes the communication he was seeing the receiver-transmitter that is built in the ignition key. The connection establishes in a radio-frequency 125 kilohertz. The block of SMARTRA puts in the ignition switch near to a frame they send - receive the radio-antenna. The sign of radio-frequency accepted by the antenna of frame is going to be transformed by the block of SMARTRA in
the messages of the serial communication and bringing near of the unity of control of the vain motor of the message if to be transformed to the transmitted radio-frequency sign he was seeing the antenna to a receiver-transmitter.
The block of SMARTRA does not execute an identification of the receiver-transmitter or the calculation of an algorithm of the codification. It represents the promoted interface that will transform the flow of data received in a radio-frequency of the receiver-transmitter to the sequence of the messages happened in the unity of control of the motor and vice-versa.
The receiver-transmitter — the type of Hitag 2 with a promoted codification algorithm. Planning a few key special data of the car that are registered it is introduced in the receiver-transmitter
memory device. The proceeding of the available register, therefore, the contents of the memory of the receiver-transmitter cannot modify. The data are introduced in the form of the chain of 9 bytes of longitude done in the manufacturer. The contents of the memory of the receiver-transmitter are divided in two chains that carry the names "opoznavatel" and "sign of a key".
After this memory of planning of the receiver-transmitter is blockaded and his contents are impossible of considering or be modifying. The steps of "planned", "pure" receiver-transmitter in a state, of a state.
Besides, each receiver-transmitter is allocated with the number itself of identification GO of 32 longitude bits. GO of numbers of receivers-transmitters they are only (do not happen again). Number GO introduce in the manufacturer and only it can be read aloud.
They do not give Opoznavatel and the sign of a key of the unity of control of the motor to a receiver-transmitter or behind. Only the results of the action of an algorithm of the codification are transferred. For his result of the codification it is almost impossible of calculating special data of the car.
To encode of keys or objective others the unity of control of the motor is joined to the device of experience like which the manufacturing prover used in stations of service of Hyundai can serve. The communication is executed in accordance with the protocol of the line "K" of the unity of control of the motor.