Δ变换与电控离合器离散化控制

Discrete Control of Electrical Controllable Clutches Using δ Operators

汽车 AMT系统电控离合器接合过程很短 ,对微机控制的精度提出了很高的要求。硬件技术的成熟使得采样周期 T可以很小 ,但当 T→ 0时 ,Z变换将导致极大的计算误差 ,而Δ变换描述的离散模型收敛于连续系统 ,更适于高精度控制。对电控离合器接合过程的仿真结果说明 ,与 Z变换相比 ,在有限字长运算中 ,Δ变换受舍入截尾扰动的影响较小 。

The sample time T can be achieved very small with hardware growing up. But if T →0,Z transform leads to large computational error.However,a discrete system described by Δ transform converges to the actual continuous counter part.So Δ transform is more propitious to high precision control.Simulations for the engaging process of electril controllable clutches are performed.The result is that Δ transform has beter performance of round off noise caused by finite word length,but more calculations are needed.