Liu Xudan, an electric vehicle R&D personnel at Bosch Changning Enterprises, led his R&D team to develop a high-speed electronic air compressor controller (hereinafter referred to as the "controller") for hydrogen fuel cells last year, breaking through a key core technology in the application of hydrogen energy in the automotive field.
From graduating from the University of Electrical Engineering in 2008 to studying in Germany for a doctorate and conducting postdoctoral research in 2017, Liu Xudan has been dealing with power and electric for more than ten years. Today, he researches and develops software and hardware for power electronic energy conversion devices at bosch Academia Sinica, mainly designing power conversion devices based on power electronics technology to achieve efficient energy conversion from batteries or fuel cells to wheels. At present, with the rise of hydrogen fuel cells, enterprise customers have put forward more requirements and challenges for their technology research and development.
During the research and development period, Liu Xudan was impressed by a fuel cell high-speed electronic air compressor controller development project. The air compressor is regarded as one of the key technologies of the on-board power system of hydrogen fuel cell vehicles, and its performance can directly affect the efficiency, compactness and water balance characteristics of the fuel cell system. The core of this project is to optimize the high-speed controller and control the speed of the air compressor at 120,000 revolutions in order to compress the air more efficiently and ensure the energy conversion of the fuel cell. "The engine speed of a fuel car is only about 3,000 revolutions at the highest, and the speed required by the project is 30 or 40 times that of this." Such a high speed requires a controller to control its stable operation, which can be said to be a difficult technical breakthrough. Liu Xudan said that this technology has no previous lessons, and it is a problem in the industry. When he took over this task, Liu Xudan quickly formed a project team, and the members worked overtime to carry out research and development at the node of the day.
Every time the experimental test fails, it is possible to damage the experimental sample, resulting in an elongated test cycle, in order to save time as much as possible and ensure a stable experiment, Liu Xudan's team stays in a small laboratory and constantly repeats the experiment. Starting from speed 0, increase the speed a little bit, and optimize the controller parameters once per increase in speed. After several rounds of testing, the speed was finally increased to 120,000 rpm steadily and efficiently. The project development was completed one month earlier than the original plan and was recognized by the customer, and the project results applied for 4 patents, and this technology was applied to the light truck of the fuel cell, and the output value is expected to reach 50 million yuan.
Liu Xudan's team's controller experimental equipment
"When the controller we participated in was exhibited at the Bosch booth of the Shanghai Auto Show last year, when our project team won the silver medal of the 'Science and Technology Star' in the 2020 Linkong Economic Park, all the members were overwhelmed with excitement, and the joy could not be calmed for a long time." Liu Xudan said that for him personally, he is also very fortunate to be able to lead his team to make breakthroughs in such a cutting-edge field of technology.
Last year, Liu Xudan won the honor of "Changning Craftsman" in 2021, which made him truly appreciate the significance of the craftsman spirit. "Keep learning and keep communicating is a very good working atmosphere for our team. I think that every technological breakthrough we make is also the cultivation of the next generation of R&D personnel, inheriting our innovative ideas and R&D spirit, and contributing to the development of the motherland and the progress of the industry. ”
Image courtesy of Liu Xudan himself
Text: Gao Yufeng
Edit: Bi Yangjing
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