Nonlinear Control of Internal Combustion Engines

本研究计画主要探讨内燃机线控非线性控制的两个基本问题：内燃机的非线性模型建立与反馈控制器设计;以及内燃机转矩的鲁棒非线性控制。非线性建模将发动机的结构合并为具有传递函数的系数的奇多项式。这些传递函数使用频率丰富的输入来识别。发动机的非线性特性被吸收在二次、三次和高阶项中，因此传递函数的识别任务被简化为线性系统识别。非线性反馈控制器的设计是在频域中进行的，使用逆函数的方法。硬时域约束代表定量输出性能和致动器饱和直接纳入设计方法。性能规格表现为非对称公差，导致系统设计受限。这些技术的实验验证是在Herrick实验室的福特4.6 L V-8发动机上进行的。

This research project deals with two basic issues associated with the drive-by-wire nonlinear control of internal combustion engines; the nonlinear modeling of the engines for feedback controller design; and the roust nonlinear control of engine torque. The nonlinear modeling incorporates the structure of the engine as an odd polynomial with coefficients that are transfer functions. These transfers functions are identified using frequency rich inputs. The nonlinear nature of engine is absorbed in the quadratic, cubic, and higher-order terms, and hence the identification task of transfer functions is reduced to a linear system identification. The development of nonlinear feedback controller design is carried out in the frequency domain using an inverse deseriking function approach. Hard time- domain constraints representing quantitative output performance and actuator saturation are directly incorporated in the design methodology. The performance specifications appear as nonsymmetrical tolerances which leads to a constrained system design. Experimental verification of these technologies is performed on a Ford 4.6 L V-8 engine available in Herrick Laboratories.