Vehicle door control system and method

A vehicle door control system comprising a vehicle-side unit and a hand-held device for controlling vehicle doors in a vehicle in accordance with a result of collation of an ID code, which is conveyed by a response signal transmitted by the hand-held device in response to a request signal transmitted by the vehicle-side unit, with an ID code registered in advance in the vehicle-side unit,

• wherein the vehicle-side unit includes:
• a receiver for receiving the response signal from the hand-held device;
• a compartment external transmitter for transmitting the request signal to an outside of a compartment of the vehicle;
• a compartment internal transmitter for transmitting the request signal to the inside of the compartment of the vehicle;
• a lock state control section for controlling lock/unlock states of the vehicle doors;
• an automatic door opening/closing section capable of automatically carrying out operations to open and close the vehicle doors;
• an operation detection section for detecting a predetermined operation carried out by a holder of the hand-held device on the vehicle doors;
• and
• a door state control section for controlling the automatic door opening/closing section and the lock state control section to automatically close and lock the vehicle doors, when the operation detection section detects the predetermined operation with at least one vehicle door in an open state and a result of collation of the ID code conveyed in the response signal transmitted by the hand-held device in response to the request signal transmitted by the compartment external transmitter is an OK and no response signal is transmitted by the hand-held device in response to the request signal transmitted by the compartment internal transmitter,
• wherein the door state control section includes a level adjustment section for setting at least one of strength of the request signal transmitted by the compartment internal transmitter and sensitivity of the hand-held device to receive the request signal to levels lower than respective normal levels, when the compartment internal transmitter transmits the request signal with the one vehicle door being in the open state.