Sliding door device for motor vehicle

A sliding door device for a motor vehicle, comprising:

• a slidably movable sliding door installed;
• a door weather strip attached to the sliding door;
• a vehicle body weather strip in contact with the door weather strip to maintain airtightness in a state in which the sliding door is closed;
• a pressure switch sensing an internal pressure of the door weather strip;
• a pneumatic line connecting the door weather strip and the pressure switch such that they communicate with each other;
• an electronic control unit controlling an opening and closing operation of the sliding door upon receiving a sensing signal from the pressure switch;
• and
• an opening and closing valve allowing the pneumatic line to communicate with atmospheric pressure or closing the pneumatic line to atmospheric pressure,
• wherein the door weather strip comprises:
• a first base portion inserted into a holder;
• a first elastic sealing portion integrally extending from the first base portion in a width direction of the sliding door and having a closed hollow section;
• and
• a pressure sensing portion integrally extending, further outward relative to the first elastic sealing portion from the first base portion in the width direction of the sliding door, the pressure sensing portion having a closed hollow section, and connected to the pressure switch through the pneumatic line, and
• wherein the vehicle body weather strip comprises:
• a second base portion installed at a door opening formed in a vehicle body;
• a second elastic sealing portion integrally extending from the second base portion toward an interior of the door opening, having the closed hollow section therein, and in contact with to the first elastic sealing portion of the door weather strip in the state in which the sliding door is closed;
• and
• a gap maintaining portion defined to maintain a predetermined gap between the second base portion and the pressure sensing portion in the state in which the sliding door is closed.