Start circuit and control method for aviation APU

Abstract

A starting circuit and a control method for an aviation APU are provided. The APU starting circuit may include: a starting controller, which is used to provide controlled starting power to the aviation auxiliary power unit; a first contactor, which is used to connect between the transformer rectifier that converts alternating current into direct current and the starting controller; The second contactor is used to connect between the storage battery and the starting controller, wherein the first contactor and the second contactor are interlocked so that when one of the first contactor and the second contactor is turned on, the other is One is disconnected; the third contactor is used to connect between the transformer rectifier and the DC power supply bus bar, wherein the DC power supply bus bar is used to supply power to the aviation DC system, wherein the first contactor and the third contactor are connected to each other A lock such that one of the first contactor and the third contactor is turned on when the other is turned off. A starting method for an aviation auxiliary power unit is also provided.

Description

technical field [0001] The invention relates to an aviation APU, in particular to a starting circuit and a control method for the aviation APU. Background technique [0002] In addition to the main power unit (engine), most large and medium-sized aircraft are also equipped with an auxiliary power unit (APU). An auxiliary power unit (APU) may be a small turbine engine used to start the main engine, provide power to the aircraft electrical grid, provide emergency energy in the event of failure of the main engine or its generator, etc. The starting of APU itself adopts electric starting method. According to the difference of the starter motor, it is divided into two ways: DC starting and AC starting. With the development of aircraft technology and changes in aircraft design requirements, there are more and more airborne equipment, and the demand for electricity is also increasing. Due to the increase in power consumption, the rated output power of the APU is also increasing,...

AI Technical Summary

Problems solved by technology

If the APU needs to be started many times during aircraft maintenance or inspection, the battery will be frequently discharged with high current, which will reduce the life of the battery

In addition, in an extremely cold environment, the performance of the battery decreases, which may not be able to fully provide the electric energy to start the APU, resulting in failure to start; if the battery is removed and heated before use, the maintenance cost will increase

In some aircraft designs, the APU is directly powered by an external power supply starting controller, which can solve the above problems, but there is a disadvantage of heavy weight of the starting system

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