【正文】 system software and hardware development and testing and redundancy design, and in the design of engine state monitoring system, introduced the embedded PC / 104 order to make the state monitoring system has a better scalability and adaptability, the system designed can work in three ways: airborne operation mode, data playback mode and ground test run mode, through these way for automatic monitoring of engine state parameter, for the state of the engine trend analysis, fault diagnosis, and as to provide scientific basis for maintenance.Key words: the engine condition monitoring。PC / 104。Under 16 way switch quantity after adopting the light into a the data processing part of the need for continuous monitoring of state parameters of the engine, so in the need for signal processing, storage and transmission, the upper machine at the same time, according to the need to receive the signal in real time and if samples values more than its upper and lower give alarm, including buzzer lower place machine and superordination machine screen alarm。The data munication between upper machine and lower machine way using serial order to improve the extensibility and adaptability of engine state monitoring system, the system designed can work in three ways: airborne operation mode, data playback mode and ground test mode, including airborne operation mode can be PC / 104 modules separately in the form of the airborne launch during the real flight test, because of the PC / 104 modules, small volume, high reliability, high temperature resistance and resistance to adverse conditions, well adapted to the flight environment, to the parts of the flight state and parameters in the flight details and accurate acquisition, data processing and at the same time, all the data are stored in the solid plate, in order to perform data playback and analysis of engine performance in the future。Ground test methods organic bination of the airborne playback mode, operation mode and data will be collected in the process of engine test parameters are processed, then realtime transmitting them via a serial port to the PC [4], PC can display the data in real time again at the same time to save order to improve the reliability of the system, make the system selfcheck function and redundant Yu Jiegou, according to the system fault conditions to change the modulation circuit or to the requirements of aircraft engine test of 20 analog quantity and frequency, and quantity of 16 way switch sampling frequency is set to 20 ms, analog signal processing precision for 12, and all recuperated into 0 ~ 5 V. Synthetically considering the factors, the system39。s goal is to develop a set of applicable to the aircraft engine condition monitoring platform system, it can realtime high pressure in the engine working process speed, throttle Angle, displacement, oil injection nozzle location, the fuel flow rate, vibration of X, Y, atmospheric temperature, T, 5, 7 T temperature, oil temperature, oil temperature, hydraulic temperature, car frame under static pressure, the static pressure, high pressure, fuel oil pressure, oil pressure and hydraulic oil pressure, etc. 17 analog and 3 road, frequency, and 16 way switch for data acquisition, processing, storage, operation, such as munication, status display and alarm software running on the upper machine and lower machine respectively, system specific features include:3. 1 state parameter realtime collection and processing In the system, plete engine various realtime acquisition of state parameter, and the associated with the state parameter of processing and calculation, and the deviations from the normal range of state parameters on the tag, to analyze the engine working condition.3. 2 realtime status parameters and playback data transmission On the surface of the test mode and online data playback mode, a machine under the PC / 104 collected status parameters via a serial port in realtime transmission to the PC, and save to the database on a PC. status monitoring and realtime data controls and related to use of drawing tools to simulate the acquisition state parameters of the digital display and the table shows, and draw the time curve so that the observation parameter of the parameters of the dynamic change and trend of the future, which can monitor the working state of the engine at different times, to achieve the purpose of condition monitoring.3. 4 alarm output and print When the colle