最优预处理方法的多小波PWM阀控制信号消噪

Denoising control signals for pulse width modulation valves based on the optimal pre-processing method of multi-wavelet

桑塔纳2000型轿车自动变速器有两个结构一样的PWM(Pulse Width Modulation)调节电磁阀。其理想的控制信号是标准的矩形波,但实际中的信号都受到不同程度的干扰。该文利用不同预处理方法的几个常用多小波对PWM电磁阀控制信号进行消噪处理。仿真计算结果表明:选择合适的预处理方法,利用多小波对信号消噪可以取得比传统小波更好的消噪效果。仿真结果验证了最优预处理方法的多小波PWM电磁阀控制信号消澡的可行性和有效性,从而为进一步提高电子控制单元ECU(electronic control unit)仿真测试台的性能提供有力依据。

The Santana 2000 automatic transmission has two PWM electro-magnetic valves in the same construction. Its ideal control signal is rectangular wave. But the actual control signal is disturbed. The control signal for the PWM valve is denoised by using different multi-waves with different pre-pro-cessing methods. Simulation results indicate that if a proper preprocessing method is chosen, the de-noi- sing performance with multi-wavelet is better than with the conventional wavelet. The said method is proved to be feasible and effective to denoise the control signal for the PWM valve, which provides support for improving the performance of the ECU simulation test platform.