Computer for activating at least one function of a motor vehicle

A motor vehicle comprising:

• a computer for activating at least one function of the motor vehicle from a portable authentication device;
• a plurality of opening elements;
• a plurality of communication modules, each communication module being mounted in an opening element of the vehicle and comprising an antenna characterized by an internal transmission zone and an external transmission zone;
• and
• a fixed reference module able to communicate with the at least one computer and with the plurality of communication modules,
• said computer configured to:
• a) determine the opening position of the at least one opening element detected in the open state from the antenna position of the communication module of the at least one opening element in the open state,
• b) determine an inner detection zone of the antenna, located in the passenger compartment of the vehicle, and an outer detection zone of the antenna, located outside the passenger compartment of the vehicle, from the determined opening position of said at least one opening element in the open state and from a predefined position of the external transmission zone and internal transmission zone of the antenna depending on the opening position of each opening element,
• c) determine the position of the authentication device with respect to the determined inner and outer detection zones, and
• d) activate at least one function of the vehicle when the authentication device is located in the inner detection zone of said opening element,
• wherein the fixed reference module is configured to determine the distance separating it from the antenna of said at least one opening element detected in the open state from signals transmitted by the fixed reference module and by the communication modules.

A method for activating at least one function of a motor vehicle from a portable authentication device, said vehicle including a plurality of opening elements, at least one computer, a plurality of communication modules, each communication module being mounted in an opening element of the vehicle and comprising an antenna characterized by an internal transmission zone and an external transmission zone, and a fixed reference module able to communicate with the at least one computer and with the plurality of communication modules, said method comprising:

• a) detecting, by the computer, an open state of at least one opening element;
• b) determining, by the computer, with respect to the fixed reference module, the position of the antenna of said at least one opening element detected in the open state from the signals transmitted by the fixed reference module and the communication modules;
• c) determining, by the computer, the opening position of the at least one opening element detected in the open state from the antenna position of the communication module of the at least one opening element in the open state;
• d) determining, by the computer, an inner detection zone of the antenna, located in the passenger compartment of the vehicle, and an outer detection zone of the antenna, located outside the vehicle, from the determined opening position of said at least one opening element and from a predefined position of the external transmission zone and internal transmission zone of the antenna depending on the opening position of each opening element;
• e) determining, by the computer, the position of the authentication device depending on the determined inner and outer detection zones;
• and
• f) activating, by the computer, at least one function of the vehicle when the authentication device is located in the inner detection zone of said opening element.

A computer for activating at least one function of a motor vehicle from a portable authentication device, said vehicle comprising:

• a plurality of opening elements;
• a plurality of communication modules, each communication module being mounted in an opening element of the vehicle and comprising an antenna characterized by an internal transmission zone and an external transmission zone;
• and
• a fixed reference module able to communicate with the at least one computer and with the plurality of communication modules,
• said computer configured to:
• a) determine the opening position of the at least one opening element detected in the open state from the antenna position of the communication module of the at least one opening element in the open state,
• b) determine, based on the opening position of the at least one opening element:
• a first location of an inner detection zone of the antenna, located on an inner side of the at least one opening element, and
• a second location of an outer detection zone of the antenna, located on an outer side of the at least one opening element,
• wherein the first location of the inner detection zone and the second location of the outer detection zone vary depending on the opening position of the at least one opening element,
• c) determine the position of the authentication device with respect to the determined inner and outer detection zones, and
• d) activate at least one function of the vehicle when the authentication device is located in the inner detection zone of said opening element and the first location of the inner detection zone is located in a passenger compartment of the vehicle.