The system of intellectual access without the key can be found on almost all cars sold at present. These systems allow the holder of the key (or key fob), unlock the driver’s door, all the doors and / or trunk of the car by pressing one button until the vehicle is within the connection. The key transfers an encoded signal to the decoder to the main computer, which acts door locks. Some remote key systems are also capable of performing other functions, such as security or removal production or even launching a car engine.
Smart car key
In order to prevent unauthorized user access due to the detection of the signal, the re-use of the signals transmitted using the key is excluded, the floating code is used. The controller and key chip contains an algorithm that generates a 40-bit code. When pressing the key, the transmitter in the key transfers 40 bite code along with the function code. The functional code tells the controller what actions should be taken (for example, open the driver’s door). Each time the transmitter button is pressed by a new 40-bit code generated using a random number generator. The same generator is used in the receiver to generate the same 40-bit code. Thus, the transmitter and receiver remain synchronized. Since the transmitter signal cannot be selected by the receiver every time the button is pressed, the receiver also calculates the next 256 codes. The transmitter and receiver are re -synchronized every time the code is passed successfully. Since there are approximately trillion of possible codes, the probability of accidentally selected code is one of 256 permissible codes extremely small.
Some remote key systems are bilateral, that is, with feedback, which allow the vehicle to transmit information about the state back to the user. These systems often have a small screen on the keychain that informs the user about the fluid level, tire pressure, the condition of the windows (up / down / broken), the condition of the door (open / closed), diagnostic data, and the locking state.
The most modern remote control systems, as a rule, have smart key. These keys use RFID technology and have passive functions in addition to their active functions performed when you press the button. The vehicle using a smart key and it may feel when the key is within a certain range of the vehicle (usually 1, 5 m), and then open the car door to the driver or will be waiting until the driver affects a certain door section. These keys, as a rule, also include passive ignition capabilities. If the driver sits on the driver’s seat and presses the ignition button, the car will be started only when the smart key is within reach.
Today, some remote input systems allow the driver to use his smartphone to replace their key or keychain. One example of this is the Smart Start system. In this case, the application on the phone gives a signal to the car receiver through a cell phone’s networks instead of a key or key. This allows the client to use only one device to manage all its means.
Some new smart-brows provide drivers of remote access to information about the car, helping to ensure the safety of data exchange. In some cases, this information can be available through a portable device, such as a smart telephone. Data that can be available may include mileage, fuel level, tire pressure, warning and maintenance alerts, personal comfort and settings, and car location.
Sensors: radio frequency receivers, contactless sensors. Executive mechanisms: door locks, speaker, trunk locks, windows and hatch, internal and external lighting, engine start, sound signal. Manufacturers: AVITAL, COMPUSTAR, Continental, Delphi, Denso, Fuzik, Huf, Lear, Marquardt, Mitsubishi Electric, Python, Valeo, Viper