US Patent 7180400 Key-less entry system and the method thereof

A vehicle key-less entry system and a method of unlocking a vehicle door can detect whether or not a vehicle door handle is operated and an operational speed when the door handle is detected by entering a cipher code. Check is made whether the entered cipher code is equal to a prestored cipher code based on the detected operational speed. A locking mechanism is controlled to unlock a vehicle door when the entered cipher code is equal to the prestored cipher code.