基于MATLAB的VVT发动机充气效率标定数据平顺性优化

采用一种基于MATLAB软件的自适应查表优化方法，优化VVT发动机充气效率的标定数据。通过对充气效率计算公式V=a＋如＋cx^2的常数项a、一次项系数b和二次项系数c标定数据的优化，使发动机的充气效率标定数据更加平顺，相邻各点之间没有出现较大的波动，优化前后的主要数据偏差没有超过5％，符合工程应用要求。

Smooth Optimization of Volumertic Efficiency Calibration Data for VVT Engines based on MATLAB

The smoothness and accuracy of volumetric efficiency calibration data for VVT engine affect the engine air - fuel ratio control accuracy. Thereby , they affect the performance of vehicle emissions, vehicle drivability and fuel economy. In this paper, the volumetric efficiency of the calibration data is ptimized by using adaptive look - up table method with MATLAB software. Optimize Volumetric efficiency formula V = a ＋ bx ＋ cx^2, Constant a, coefficient b and the quadratic coefficient c are optimized. The engine volumetric efficiency calibration data are smoother, there is no great fluctuation between adjacent points. Before and after optimization, the main data deviation does not exceed 5%, which meets engineering application requirement.