Smart Handle
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The Smart Handle (4) consist of a capacitive lock and pull detection switch (1) which allows the user to actively lock the vehicle. The capacitive unlock switch (2) senses a hand in the handle to unlock the vehicle. There is a handle bucket illumination also incorporated into the inside of the handle (3). An adaptation algorithm in the logic circuit of each handle can modify the sensitivity of the capacitive switches as well as system responses to the pull detection switch inputs to compensate for sensed repeated or continuous actuations with no valid key present. The Smart Handle has a "play protection". In the event that seven handle activations are made (in a row) where no valid FOB is found, the RFH will stop waking the vehicle on detection of a smart door handle and wait until a FOB is detected. After six hundred (600) wakeups where no FOB is found, the RFH will stop waking the vehicle until a smart door handle is pulled. When the handle is pulled a signal to the RHF to wake the system. The handle pulled status is only used to wake a sleeping door handle. Each of the outside front PE smart door handles are powered by and provide a direct input to the Integrated Circuit (IC) of that handle. The IC of each PE outside door handle receives power from the RFH on a signal circuit, and a clean ground from the RFH on a return circuit. The PE handle IC and the RFH communicate with each other by modulating the current in the signal circuit. The inputs from the three switches and the handle logic circuit allow each handle to send the RFH up to three different signals: Unlock Request, Lock Request and Error. The RFH determines the system response based upon the inputs it receives from each handle as well as the inputs it receives through the authentication process with each detected key fob. The RFH detects the vicinity of the key to the vehicle through the vehicles various LF antennas. The key recognition and authentication stage begins when the vehicle user places their hand inside of the handle. At that moment, the RFH reads the Key Identification (KEY-ID) and the secret code stored. If the RFH identifies the key encoded in its memory, the request to unlock the doors or the driver door only (depending on the setting in the customer programmable options menu) to the BCM. The smart handle provides status for the unlock sensor, lock sensor, handle pull status and an error state to the RFH. The capacitive switches are serviced separately from the smart handle. |