Patent ID: 7109843

Claim:
A vehicle remote control system having a vehicle-mounted control apparatus which is mounted in a host vehicle, and a plurality of portable apparatuses each adapted to transmit response data which are specific to said each portable apparatus in response to reception of a calling code that is transmitted from said vehicle-mounted control apparatus, said vehicle-mounted control apparatus including communication means for executing wireless communication with any of said portable apparatuses which enter a communication region of said vehicle-mounted control apparatus and calling means for generating said calling code and supplying said calling code to said communication means to be transmitted thereby, and control means for performing control of at least one controlled device of said host vehicle in response to reception of said response data from one of said portable apparatuses, wherein said vehicle-mounted control apparatus comprises memory means having stored therein a plurality of ID (identifier) codes respectively assigned to said plurality of portable apparatuses and information specifying respective degrees of priority for said ID codes, said calling means and communication means transmit said calling code followed by each of said lID codes in succession, with said ID codes transmitted in order of said degrees of priority, each of said portable apparatuses is adapted to respond to reception of said calling code and the ID code which is specific to said each portable apparatus by transmitting said response data and, said control means of said vehicle-mounted control apparatus is responsive to reception of said response data from one of said portable apparatuses for updating said degrees of priority stored in said memory means such that said one of the portable apparatuses is assigned a highest one of said degrees of priority; wherein at least a part of said calling code is a variable code, and wherein each of said portable apparatuses performs encoding of said response data by using said variable code as an encoding key, before transmitting said response data, and wherein said control means performs decoding of said encoded response data when received by said communication means, using said variable code as a decoding key, and performs control of said controlled device and updating of said degrees of priority only when data resulting from said decoding are in accordance with predetermined conditions.