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Remote keyless entry system (RKE)

Vehicles are typically provided with a number of separate security locking features. A remote keyless entry (RKE) system enables a user to lock and unlock an automobile or other kind of vehicle at distance without using a key. A remote entry radio receiver is mounted in the vehicle which responds to a radio transmitter carried by the user of the vehicle. The receivers typically used in such systems are amplitude shift keying (ASK) receivers. Such receivers are effective for receiving the radio frequency signals typically generated by transmitters in remote keyless entry systems. The radio transmitter is often referred to as a remote keyless entry (RKE) device or remote fob wherein "fob" refers to a keychain transmitter. To gain access to the vehicle, the person presses an unlock button on the key fob, which causes a signal containing authentication information and an unlock command to be transmitted to a receiver inside the vehicle. The transmitter and a receiver use a defined communication protocol. The communication protocol defines the timing of the bit stream and the tolerances. The transmitter can include a microprocessor that transmits according to a communication protocol. An electronic control unit in the vehicle processes the signal, determining, based on the authentication information, whether the operator of the key fob is permitted access to the vehicle and unlocking the vehicle if access is authorized. The fob-type keyless entry works by sending a coded RF signal to a receiver-decoder-actuator in the vehicle.

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