F2008-05-035
Electromagnetic Compatibility Design for Powertrain Control Module (PCM)
Electromagnetic Compatibility Design for Powertrain Control Module (PCM) Wang Yu-ming, Cui Tao, Liu Bo-lan, Zhang Fu-jun (School of Mechanical Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China)
According to the increasingly complicated EMC environment in vehicle, a powertrain control module (PCM) was developed with a lot of measurements according to EMC problems. A series of EMC test carried out after the system completed. Results show that the system has an ideal Electronic-magnetic capability and a national EMC authentication is also achieved. 1. PCM system introduction Powertrain control module (PCM) is an integrated control system which combines engine electronic control and transmission electronic control together. The signals used in PCM system can be classified as analog signals, thermoelectric couple signals, rotor speed sensor signal, drive pulse signal, SCI & CAN bus. 2. PCM EMC design Consider the signal characters mentioned above, the inside capacity of the PCM´s shell is divided into three hatches with clapboard: Power Hatch, Digital Hatch and Filter Hatch. The whole PCM module is powered by vehicular 24V battery. To reduce the infection between high-power EUP drive system and digital system, the power supply cable is divided into high-power supply and digital power supply, which connected to one single junction at battery plug. Both positive and negative power supply cable from vehicular battery is filtered by LC filter board somewhere nearby electro-connector inside Filter Hatch. The system power ground is divided into digital ground, analog ground (high-power) and shield ground. All signals transmit between digital boards and high-power boards must be isolated by optical couplers. The fuses are used to prevent any short circuit between analog/digital ground and shield ground. The solenoid coil in EUP injector is an inductance load. A protect network was adopted to protect the MOSFET. 3. EMC test After hardware design completed, the PCM is tested under national electromagnetic emission and susceptibility requirement for ground equipment and subsystems. The test includes 5 setups as: Conducted emission, power leads, 10 kHz to 10 MHz. Radiated emissions, electric field, 2 MHz to 18 GHz. Conducted susceptibility, power leads, 25 kHz to 50 kHz. Conducted susceptibility, bulk cable injection, 10 kHz to 30 MHz. Radiated susceptibility, electric field, 30 MHz to 18 GHz. 4. Conclusion By divided traditionally shell into different hatches electromagnetically shielded to each other, a PCM system is developed. The high-power analog components and low-power digital components are placed in different hatches to eliminate electromagnetic disturb between. The type, placement, parameters of filter component equipped in PCM are selected base on corresponding tests. Finally, the national EMC authentication is also acquired.
Author´s affiliation: Wang Yu-ming, male, born Aug 25th 1982, Nan Chang city, Jiang Xi province, China Addresss: School of Mechanical Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China(PRC). E-mail Address: birdpaladin@bit.edu.cn Research fields: Integrated powertrain electronic control. Paper published: 1. Design and exploitation of a mobile engine operating condition signal simulator.Chinese Society for Internal Combustion Engines v27 n6
Poster presentation: Electronics