Rf Passive Access Control System Designed To Consider Matters
The system Car Comfort and safety is leading a new trend. Although this technology has been around for a few years ago, but only recently began to rapidly popular, mainly because the system more integrated, the system costs can be significantly reduced.
To complete, the remote keyless access control (Remote Keyless Entry, RKE) system is interactive, that is, the user must press the key to open the door; and passive access control system is passive, that is, they do not make any interactive user can open the door movement. When the user is ready to enter the vehicle through the sliding door handle action trigger system launch low PE Lowfrequency, LF) signals. Key card within a few milliseconds receive LF signals, and receives encrypted data packets, and then by radio frequency (RF) channel the encrypted signal sent to the vehicle for confirmation.
Passive access control system can also contain a passive engine launch function, which is a passive access start (PassiveEntry Go, PEG). As long as the system recognizes the key card inside the vehicle, the driver will trigger the LF driver’s seat of a riding circuit. Confirmed in the verification and after the completion of position measurement, simply press the start button you can start the engine.
Both cases are through the key card to receive plain text data, and use of powerful hardware encryption module (such as AES-28 module) on the encrypted, then encrypted data and then returned to the vehicle in order to make verification .
PE key card in a small lithium Battery For data reception, encryption and transmission to provide power. Passive access control system, key card, designed to ensure long battery life as much as possible. If the battery will soon run out, the key card will enter an emergency mode, by LF magnetic field coil to obtain sufficient energy to achieve without battery. At this time the key card needs to be placed in the position near the door coil. In this case, the system will be carried out through the LF channel Communicate .
Typical PE system A typical PE system is composed of automotive interior parts and a key card subsystems, both as a peer communication, establish two communication links: (1) LF Uplink: vehicle to the Middle key card, (2) ultra-high frequency (UHF) Downlink: key card to the vehicle (see Figure 1).
Figure 1 Schematic diagram of passive access control system module
Car parts
When the user when driving car door handles, antenna drive vehicles will generate LF field. This change in activation of the central dashboard controller, request key card start LF communications. Usually, the fans are installed inside the doors, LF antenna coil drive unit driven by the antenna (an antenna drive unit can drive multiple antenna coil, for example, ATA5279 can drive up to six different antenna coil). System uses a UHF receiver module to receive from the key card issued by the RF data to support the RF link. The data received encrypted before being sent back to the dashboard controller, and then decrypted by software
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