In order to improve the electromagnetic compatibility of powertrain control module （PCM）, a system procedure of vehicular PCM electromagnetic alteration is presented in this paper. First of all, the box of the PCM i...In order to improve the electromagnetic compatibility of powertrain control module （PCM）, a system procedure of vehicular PCM electromagnetic alteration is presented in this paper. First of all, the box of the PCM is divided into different cabins to eliminate interferences between power supply circuit, analog circuit and digital circuit. Secondly, the working principle and electromagnetic （EM） characters of all the signals adopted by a typical PCM are analyzed. Then according to specific electromagnetic characters, different measures are adopted in corresponding signal process circuits or signal transfer cables, such as ground layout designing, power supply protecting, signal shielding and drive cable interference suppressing. Finally, further improvement may also needed regarding to practical electromagnetic compatibility test effects. The final test shows that, with all the measures mentioned above, the conducted emission of a PCM can be reduced by 20 dB; meanwhile, the radiated emission can be reduced by 30 dB comparing to the original system.展开更多
针对电子计量设备的辐射电磁干扰问题,建立了相应的近场辐射模型和线缆辐射模型,分析了辐射噪声生成机理.据此,设计了相应的辐射噪声抑制措施,包括在单片机输出引脚并联高频滤波电容以抑制共模与差模噪声,将连接线缆改为双绞线,串联高...针对电子计量设备的辐射电磁干扰问题,建立了相应的近场辐射模型和线缆辐射模型,分析了辐射噪声生成机理.据此,设计了相应的辐射噪声抑制措施,包括在单片机输出引脚并联高频滤波电容以抑制共模与差模噪声,将连接线缆改为双绞线,串联高频电感,并加载铁氧体磁环以抑制线缆辐射噪声.实验结果表明,此方法可有效降低辐射干扰噪声,并满足GB9254 Class B标准.展开更多
基金Sponsored by the Ministerial Level Foundation(10660060220)
文摘In order to improve the electromagnetic compatibility of powertrain control module （PCM）, a system procedure of vehicular PCM electromagnetic alteration is presented in this paper. First of all, the box of the PCM is divided into different cabins to eliminate interferences between power supply circuit, analog circuit and digital circuit. Secondly, the working principle and electromagnetic （EM） characters of all the signals adopted by a typical PCM are analyzed. Then according to specific electromagnetic characters, different measures are adopted in corresponding signal process circuits or signal transfer cables, such as ground layout designing, power supply protecting, signal shielding and drive cable interference suppressing. Finally, further improvement may also needed regarding to practical electromagnetic compatibility test effects. The final test shows that, with all the measures mentioned above, the conducted emission of a PCM can be reduced by 20 dB; meanwhile, the radiated emission can be reduced by 30 dB comparing to the original system.
文摘针对电子计量设备的辐射电磁干扰问题,建立了相应的近场辐射模型和线缆辐射模型,分析了辐射噪声生成机理.据此,设计了相应的辐射噪声抑制措施,包括在单片机输出引脚并联高频滤波电容以抑制共模与差模噪声,将连接线缆改为双绞线,串联高频电感,并加载铁氧体磁环以抑制线缆辐射噪声.实验结果表明,此方法可有效降低辐射干扰噪声,并满足GB9254 Class B标准.
