Vehicle accessory trainable transmitter

  • US 5,479,155 A
  • Filed: 06/21/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 12/05/1988
  • Status: Expired due to Term
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First Claim
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1. A vehicle accessory including a trainable transmitter for transmitting a radio frequency control signal for remotely actuating a remotely controlled device, comprising:

  • a housing;

    a connector connecting said housing to the interior of a vehicle in an area accessible to the vehicle operator;

    a transceiver mounted in said housing for receiving signals from an existing remote control transmitter for the device, said transceiver including;

    a detector inputting the signals received from the existing remote control transmitter,a memory for storing frequency and code format information,a variable frequency generator having a frequency control input and an output, said variable frequency generator generating a signal at said output having a frequency selected by a frequency control signal at said frequency control input,a switch having a switch control input and an output, said output coupled to said variable frequency generator,a controller for generating said frequency control signal and a switch control signal, said controller coupled to said memory, said controller including an input coupled to said detector, said controller including an output coupled to an input of said variable frequency generator, said controller having a switch control output coupled to said switch control input of said switch, said switch control signal including a data sequence which selectively disables said variable frequency generator; and

    an output circuit connected to said output of said variable frequency generator;

    wherein said output circuit responds to signals from said variable frequency generator to selectively transmit signals output from said variable frequency generator for remotely actuating a garage door opening mechanism at a carrier frequency stored in said memory and modulating data according to a code format stored in said memory, wherein said controller learns frequency and data information for at least two signalling formats of remote control signals from remote control transmitters for controlling operation of at least two different types of remote control garage door opening mechanism receivers, said controller identifying a first signalling format when a predetermined number of data transitions are detected in a first preset time interval, said controller identifying a second signalling format when a second predetermined number of data transitions are detected in a second preset time interval.

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