Non-overshooting temperature control algorithm for CT detector

Abstract

The invention provides a non-overshooting temperature control algorithm for a CT detector. The algorithm comprises the following steps: system initialization: setting target temperature, detection point temperature difference, PID parameter, sampling number, target temperature AD value, ADC reference voltage and PWM output restriction; temperature measurement: collecting the temperature at a testpoint through a NTC thermistor; fault judgment: judging whether a working state and temperature of a temperature probe are in a normal range; if the working state and temperature of the temperature probe are in the normal range, computing the heating power by adopting the PID, and then performing the heating; producing negative error through a proportional parameter Kp by adopting the formula different from the conventional PID algorithm; and judging weather reaches the target temperature. Through the new PID algorithm design, the Kp is still in continuous effect to commonly maintain the balance with the integral parameter Ki even reaching a steady state, the overshooting can completely disappear. The temperature of the detector module can be controlled at 37 DEG C+ / -1 DEG C by adopting the technical scheme disclosed by the invention, and the algorithm is fast and free from overshooting.

Description

technical field [0001] The invention relates to the technical field of CT detector control algorithms, in particular to an overshoot-free temperature control algorithm for CT detectors. Background technique [0002] The detector is the core component of the CT system. The excellent performance of the detector directly determines the image quality of CT. In order to obtain a good CT image, the detector needs to work under constant temperature conditions. Therefore, it is very important to provide constant temperature conditions for the detector. Important, due to differences in materials and processes, the working temperature of CT detectors of various manufacturers is also slightly different, but generally it is around 37 degrees Celsius. Due to the difference in structure, the temperature control schemes of each manufacturer are also different. PID temperature control is a common temperature control method, but the traditional PID algorithm is difficult to solve the problem...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the phenomenon that the conventional PID algorithm cannot completely eliminate the overshoot temperature control of CT detectors in the prior art, the present invention provides a non-overshoot temperature control algorithm for CT detectors. The specific technical solutions are as follows:

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