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 ,而计算量稍有增大 Automotive AMT system electronically controlled clutch engagement process is very short, the accuracy of computer control made a very high demand. The maturity of the hardware technology makes the sampling period T can be very small, but when T → 0, the Z transform will lead to great computational error, while the discrete model described by the Δ transform converges to the continuous system, which is more suitable for high precision control. The simulation results of the electronic clutch engagement process show that compared with the Z transform, the Δ transform is less affected by the rounding truncation disturbance in the limited word length operation, and the amount of calculation increases slightly