| 摘要 |
<p>The present disclosure relates to a pressure adjustment apparatus. The apparatus comprises: a temperature sensing chamber, a temperature control apparatus, a rough pressure adjusting mechanism, a processor, a touch screen, an analog-to-digital converter, a pressure sensor and a pressure-making chamber. The pressure sensor senses the pressure within the pressure-making chamber and outputs an electric signal which is computed by the processor to obtain a current pressure value after being converted by the analog-to-digital converter. The processor compares a set pressure value inputted by a user though the touch screen with the current pressure value detected in real time to obtain an error value. By using a double closed-loop PI control algorithm, the processor first controls the rough pressure adjusting mechanism of the inner loop to rapidly perform rough adjustment, and then controls the temperature control apparatus of the outer loop to change the chamber volume of the temperature sensing chamber by controlling temperature, and thus to achieve the function of precise pressure adjustment. The pressure adjustment control system in the present disclosure has high precision, simple structure, low cost, and wide application.</p> |
