Embedded Software Design And Research For The Control Component Of The Power Drive Unit Of An Aircraft Cargo System

For large aircraft independently developed by china,cargo hold is a very important structure.The power driver unit provides power for the aircraft cargo system and is one of the important equipments to ensure the safety of cargo loading and uploading.At present,the design and production of power drive unit for aircraft cargo system are monopolized by foreign countries.Therefore,It is of great significance to independently research and development aircraft cargo system.Power drive unit includes control component,three-phase asynchronous motor and actuator.Control component is the core component of power driver unit and is responsible for detection,communication and protection functions.This paper focuses on the design and implementation of the control component embedded software,and researches the key technologies such as overcurrent delay protection and photoelectric detection of the control component.The main content of this article:(1)The overall design scheme for the control components of the power drive unit of an air cargo system is formulated.The function and performance of the control component are analyzed in detail,and the functional performance requirements of the control component embedded software are refined.According to the idea of layered design and modular design,the software architecture design of the control component is completed,and the control component embedded software is divided into the driver layer,the function module layer and the application layer,which reduces the internal coupling degree of the control component embedded software,and improves the reusability and readability of the software?(2)The embedded software for the control component of the power drive unit is designed in detail.Firstly,the driver layer of the control component is completed,and the API is provided for the upper layer application.Based on the control component's driver layer,the detailed design of the function module layer is completed,and the power drive unit's ID,CAN bus communication,current detection and overcurrent protection,temperature detection and overheating protection,photoelectric detection and other functions are realized.On this basis,the front and back task scheduling of the control component is implemented,and the complete detection and protection function of the control group is realized.(3)The overcurrent delay protection strategy for three-phase asynchronous motor of power drive unit is mainly researched.According to the idea of discrete and integral,the overcurrent detection is realized which avoids the impact of transient current impact on the overcurrent protection of the motor.The improved cyclic queue is used to store data in the current detection process,thus improving the data processing efficiency.This paper analyzes the influencing factors that lead to the misdetection of control components and the denoising effect of Butterworth low pass filter on photoelectric detection.On this basis,the influence of interference signals is eliminated by signal modulation and frequency spectrum analysis,and the problem of misdetection of control components is solved.(4)The validity and reliability of the embedded software is verified through the control component functional performance test and the joint debugging of the aircraft cargo system.Through functional performance test,the function of reading power drive unit ID,communication function,the function of temperature detection and overheating protection,the function of current detection and overcurrent delay protection as well as photoelectric detection for the control component are verified.The joint debugging between the control components and the aircraft cargo system is completed on the test platform of aircraft cargo system,which verifies the validity and reliability of the embedded software of the control component.