Closed-loop probe heating control system

Abstract

The present invention provides a closed-loop probe heating control system to provide a heating control system with accurate temperature control, low power dissipation and high reliability. The closed-loop probe heating control system is realized through the following technical schemes: a probe temperature sensor (1) feeds resistance signals into an analog quantity conditioning module (2) for conditioning and converts the resistance signals to voltage signals, an A / D converter (3) converts the voltage signals to digital signals and then the digital signals are processed through a central processing unit (CPU) (5), the central processing unit (CPU) (5) emits control signals to a regulation PWM wave heating module (6) according to the collected temperature signals, the control signals are compared to the preset threshold of probe heating, the duty ratio of the PWM wave heating module is regulated according to a comparison result, pulse width modulation (PWM) waves are output to a probe heating wire (7), the heating power of the probe heating wire is regulated, the temperature of the probe is controlled on a preset threshold, and the duty ratio of a heating power supply is regulated to realize the regulation of the probe heating wire heating power.

Description

technical field [0001] The invention relates to a heating control system for an aircraft probe atmospheric total temperature probe. More specifically, the present invention is directed to a probe heating control system for precise temperature control. Background technique [0002] An aircraft pitot probe is a tubular device that measures the total and static pressure of an airflow to determine airflow velocity. Pitot tubes are extremely important measurement tools on aircraft. The installation position of the pitot probe must be in the area outside the aircraft where the airflow is less affected by the aircraft. In order to prevent the small hole at the front end of the pitot probe from freezing and blocking during flight, the pitot probe on the general aircraft has electric heating. device. [0003] The probe heating control system in the prior art is composed of a relay and a heating wire, and the heating is performed by directly controlling the heating wire through the...

AI Technical Summary

Problems solved by technology

Since this heating mode adopts manual heating directly through the relay and does not control the heating temperature, it has the following disadvantages: first, the heating wire is always in a full heating state, which increases the unnecessary power consumption of the aircraft; The risk of probe deformation, heating at low altitude or on the ground will lead to overheating and deformation of the probe; the third is that the relay is heavy and has low reliability; the fourth is open-loop control, and the heating state of the probe is not clear

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