In the development of hybrid vehicles, major auto manufacturers continue to improve and optimize the battery, vehicle weight, control strategy, etc., so that their fuel consumption is further reduced. Recently, Toyota Motor Corporation cooperated with Denso Co., Ltd. and Toyota Central Research Institute Co., Ltd., and the new power control chip developed by SiC material provides a new way to reduce the fuel consumption of hybrid vehicles.
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This SiC material power semiconductor chip is expected to be used in the hybrid control unit's power control unit (hereinafter referred to as "PCU"), and will begin driving experiments on public roads within the next year. The future goal is to reduce the fuel consumption of hybrid vehicles by 10% and reduce the volume of PCU by one-fifth compared to current silicon-based power semiconductor chips. Lower fuel consumption means longer cruising range, which is very important for hybrid cars.
The PCU plays a very important role in the utilization of electric energy of vehicles such as hybrid vehicles, such as controlling the vehicle speed by electric power supply while traveling, and charging the battery by electric power during deceleration. The image says that its function is similar to the CPU used in our usual home computer. The whole vehicle power system is completely "reconciled by the military", which tells the power system when to do something.
In addition, PCUs account for about a quarter of the power loss of hybrid vehicles, and most of them are derived from power semiconductors, so about 20% of the power loss of the entire hybrid vehicle is due to power semiconductors. Therefore, improving the efficiency of the power semiconductor, that is, reducing the resistance when the current flows, is one of the key technologies for reducing fuel consumption. Since the first Prius market was launched in 1997, Toyota has been working on the independent development of power semiconductors, and is working to reduce the fuel consumption of hybrid vehicles. The result is the protagonist SiC material power semiconductor power control chip.
SiC is a silicon-to-carbon compound that is more likely to improve conduction efficiency than conventional semiconductor materials. Toyota has been conducting research since the 1980s and has been working in 2007. Technology development. Recently, Toyota Motor Corporation has equipped the PCU with SiC power semiconductor (diode and transistor) chips on the prototype car of the hybrid car and tested the fuel in the most rigorous JC08 fuel mode. Finally, the driving test carried out at the test site confirmed that the fuel consumption of the hybrid vehicle equipped with the SiC power semiconductor chip PCU can be reduced by more than 5%.
In addition, in December 2013, Toyota Motor Corporation is developing a clean room for the development of SiC-specific semiconductors in the Hirose Plant in Japan, which is developing and manufacturing electronic control devices and semiconductors, and strives to reduce the fuel consumption of hybrid vehicles by 10%. .
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