Based on the shortcomings of the traditional cooling system, the design idea of ​​the automatic cooling damper system is proposed. Design of automatic cooling damper system The traditional cooling damper is closed-loop control of cylinder temperature through the driver's judgment on CHT. The control timeliness and control accuracy are limited by the driver's physiological conditions. And the driver caused too much physical exertion and energy dispersion, which is not conducive to flight safety. To solve the above contradiction, an automatic controller can be used instead of the driver to complete the closed-loop control of the cylinder temperature. The design idea of ​​this controller is based on the original organic equipment and instruments.
The sensor cylinder temperature sensor is a thermocouple temperature sensor, which is available in two types: electric nozzle gasket type and plug-in type. The former is installed in the lower part of the electric nozzle instead of the ordinary electric nozzle gasket. The latter is embedded in a special casing in the cylinder. Both need to be installed in the hottest position of the engine cylinder as determined by the test bench test. Compare the two CHT sensors, which are more accurate and have a current of only a few milliamps.
The sensor selected in this design is a voltage type temperature sensor whose reference temperature of zero voltage output is the target temperature. The electro-hydraulic servo valve electro-hydraulic servo valve not only converts the electrical signal into a hydraulic signal, but also acts as a signal amplification. It is mainly composed of two parts: a torque motor and a hydraulic amplifier. The torque motor uses a permanent magnet torque motor, and the input current signals i1 and i2 are differential DC currents, which are output by the front stage push-pull amplifier. Ps is the servo constant pressure oil pressure, and P0 is the return oil pressure.
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