As the country further improves vehicle fuel consumption and emission standards, energy conservation and emission reduction has become a common issue for automotive companies. The 48V system has the characteristics of low investment, obvious energy saving and emission reduction, and can significantly improve the power of the vehicle power supply, which has become a hot spot in the recent automotive industry research. This article will start with the development and application of automotive 48V system, and simply present the current status and future trends of 48V system.
1.48V system development and background car electrical platform development process
Before 1970 - 1970s
6V system - -12V system
Push 1: Large integration of electrified components
Push 2:6V system can not meet the power requirements of automotive electrical appliances
Result: Automotive electrical platform upgrade
1990s--42V system concept
Purpose: To cope with the future trend of automotive electrification (seeking more than 3 times the voltage)
Main participant: United States
Standard: The SAE meeting has been discussed
Result: Failed, but some parts retain 42V
42V system failure reason
- A complete architectural revolution that requires innovation in all electronic components in the car
- Cost output is not ideal, the market is unacceptable
- Failure to bring the desired energy savings
- 12V architecture is well modulated and has achieved a series of energy saving advances
2000s--12V system
Return to 12V system
Start-stop technology
2010s-48V system proposed
Push 1: European 2020 95g/km regulatory pressure
Push 2: Start-stop technology pushes 12V system load capacity to the limit
Main participant: Germany
Standard: 48V system standard LV148
After the 2010-48V system integration is perfect
- Integration of 48V systems into legacy 12V systems via DC/DC converters, avoiding revolutionary changes
- 48V/12V dual assembly voltage technology accumulation
- The emergence of lithium batteries and super capacitors is an opportunity for the development of 48V technology
- Oil saving effect is obvious (NEC working condition 10%-15%)
Strict energy-saving regulations promote the development of 48V systems
By 2020, national CO2 emission regulations are limited to about 100g/km. Europe has been ahead in energy control, and the United States and China have gradually caught up.
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