基于瞬时转速Armax模型的柴油机指示扭矩估计方法研究

摘要

Aiming at disadvantages of existing methods of indicated torque estimation , a new method was brought out based on instantaneous speed and a nonlinear dynamic model of a Diesel engine.A new concept-synthetic acceleration was introduced here to eliminate the effect of the non-linear part in the model.Regarding the synthetic acceleration as input and the indicated torque as output, the Armax model was used to build the transfunction, so the indicated torque estimation based on instantaneous speed was realized.%针对目前国内外各种指示扭矩估计方法的优势与不足,基于柴油机非线性动力学模型,提出通过瞬时转速估计指示扭矩的方法.文中引入当量角加速度概念,消除了柴油机的动力学模型非线性项影响.将当量角加速度视为柴油机系统输入,指示扭矩视为输出,考虑系统的非平稳性,通过建立Armax模型,得到量角加速度和指示扭矩之间传的传递函数,从而实现基于瞬时转速的指示扭矩估计.