32 位定点运算数学库IQmath 在航空发动机FADEC 系统中的应用

为提高航空发动机FADEC系统定点CPU的计算效率和计算精度,针对实际工程应用中的数学运算的方法展开讨论,分析了定点数运算和浮点数运算在计算精度和运行效率方面存在的差异。参考TI公司的设计理念,自行设计了支持统一定点算法和可变定点算法的32位定点运算数学库IQmath。在国内发动机控制领域不再依赖国外的库函数,掌握了32位定点数学库的源代码,并在实际项目中应用了IQmath数学库。试验结果表明:IQmath数学库的应用提高了定点CPU数学运算的精度和效率,完满实现了预定的控制算法。

Application of 32 bit Fixed-point Arithmetic Library IQmath in FADEC System of Aeroengine

In order to improve the computational efficiency and accuracy of the fixed-point CPU of Aeroengine FADEC system, the mathematical operation method in practical engineering application was discussed and the differences between the fixed-point operation and the floating-point operation in the calculation accuracy and the running efficiency were analyzed. Reference to TI''s design concept, arithmetic library IQmath was designed, which support the unified fixed-point algorithm and variable fixed-point algorithm 32-bit fixedpoint. In the field of domestic engine control is no longer dependent on foreign library functions, the 32-bit fixed-point mathematical library of the source code was mastered, and the IQmath library was applicated in actual project. The results show that the application of IQmath library improves the accuracy and efficiency of fixed-point CPU mathematical operation, and realizes the predetermined control algorithm.