Operator responsive keyless entry system with variable random codes

A keyless entry system for a vehicle comprising:

• door lock means for locking or unlocking a door of a vehicle;
• first means responsive to a system operation starting signal provided by an operator for providing a random code variable at every operation;
• second means for providing a request code signal including said random code;
• third means for providing a first particular code signal into which said random code is converted based on a first predetermined code stored in a memory;
• fourth means for outputting said request code signal;
• fifth means for receiving said request code signal, said fifth means including;
• sixth means for providing a second particular code signal into which said random code, included in the received request code signal, is converted, based on a second predetermined code, identical with said first predetermined code, which is stored in a memory, and
• seventh means for outputting said second particular code signal;
• comparing means for comprising said first particular code signal with said second particular code signal input from said seventh means to provide a signal indicative thereof;
• and
• control means for controlling said door lock means in response to the signal from said comparing means when said first particular code signal is matched with said second particular code signal.

A keyless entry system for controlling access to a vehicle comprising:

• transmitting means for transmitting a first particular code signal;
• and
• receiving means for receiving the first particular code signal from said transmitting means:
• said receiving means including,
• first means responsive to a system operation starting signal provided by an operator for generating a random code variable at every system operation,
• second means for providing a request code signal including the random code provided by said first means and a first preselected identification code stored in a memory to output request code signal to said transmitting means, and
• third means for providing a second particular code signal including a code obtained by modifying the random code according to preselected algorithm stored in a memory,
• said transmitting means including;
• fourth means for receiving the request code signal output from said second means, said fourth means responsive to concurrence of the first preselected identification code included in the received request code with a second preselected identification code stored in a memory to provide the first particular code signal including a code obtained by modifying the random code included in the request code signal according to a preselected algorithm stored in a memory which is identical with the preselected algorithm of said third means to output the first particular code signal to said receiving means,
• said receiving means further including,
• comparing means for comparing the second particular code signal with the first particular code signal output from said transmitting means to provide a signal indicative thereof, and
• control means responsive to the signal output from said comparing means when the first and second particular code signals agree with each other for controlling access to the vehicle.