Control system and method for controlling at least one function of an object and access control and driving authorization device for a motor vehicle

A method for controlling at least one function of an object, which comprises:

• carrying out an authorization check between a portable code transponder and a base station disposed at an object by:
• transmitting, through a transmitter, an interrogation signal in at least one pulse modified in at least one of amplitude, pulse length, and frequency;
• receiving the interrogation signal through a receiver having a transmitter circuit, the receiver conducting the at least one pulse to the transmitter circuit through a bypass path without evaluation processing;
• transmitting through the transmitter circuit the at least one pulse and a response signal containing a code information item;
• receiving the at least one modified pulse and the response signal;
• measuring a time period between an emission of at least part of the interrogation signal and a reception of the at least part of the interrogation signal in the response signal obtained in reaction to the interrogation signal;
• comparing the time period with a predefined reference time period;
• determining whether or not the code information item contained in the response signal is an authorized code information item;
• and
• enabling or carrying out a function only if the authorized code information item is determined to have been received and if the measured time period lies within the predefined reference time period.

A method for controlling at least one function of an object, which comprises:

• carrying out an authorization check between a portable code transponder having a portable receiver, a bypass path, and a transmitter circuit, and a base station disposed at an object, the base station having a base station transmitter, a base station receiver, and a control unit, by:
• transmitting, through the base station transmitter, an interrogation signal in at least one pulse modified in at least one of amplitude, pulse length, and frequency;
• receiving the interrogation signal through the portable receiver, the portable receiver conducting the at least one pulse to the transmitter circuit through the bypass path without evaluation processing;
• transmitting through the transmitter circuit the at least one pulse and a response signal containing a code information item;
• receiving with the base station receiver the at least one modified pulse and the response signal;
• measuring with the control unit a time period between an emission of at least part of the interrogation signal and a reception of the at least part of the interrogation signal in the response signal obtained in reaction to the interrogation signal;
• comparing with the control unit the time period with a predefined reference time period;
• determining with the control unit whether or not the code information item contained in the response signal is an authorized code information item;
• and
• at least one of enabling or carrying out a function with the control unit only if the authorized code information item is determined to have been received and if the measured time period lies within the predefined reference time period.