System, apparatus and method for controlling internal pressure of inflatable pad

A pressure controlling apparatus for controlling an internal pressure of an inflatable pad, comprising:

• a control valve for switching between statuses to selectively perform inflation and deflation of the inflatable pad;
• a sensor for measuring the internal pressure of the inflatable pad,
• a driving device coupling to the control valve to blow air into the inflatable pad;
• and
• a controller coupling to the control valve for controlling the internal pressure at a predetermined pressure and, responsive to the present of a user, deflating the inflatable pad within a deflation period;
• wherein the internal pressure is recorded during the deflation period and a characteristic curve corresponding to the user is obtained representing the variation of the internal pressure, and wherein the controller determines an appropriate pressure based on the characteristic curve.

A method for controlling an internal pressure of an inflatable pad, comprising the following steps:

• controlling the internal pressure of the inflatable pad to a predetermined pressure;
• upon the present of a user, deflating the inflatable pad within a deflation period;
• recording a variation of the internal pressure during the deflation period;
• obtaining a characteristic curve corresponding the user;
• comparing the obtained characteristic curve to a database containing a plurality of characteristic curves corresponding to persons with a plurality of mass distributions;
• and
• determining an appropriate pressure corresponding to the user based on the comparison.