When chatting with friends in the industry, everyone is very interested in the 12V power distribution system. I am here to talk about some simple ones. Simply put, the car is powered by a 12V generator and battery. Schematic 1 is as follows:
PCM to control the generator
BCM to get the voltage and current of the battery
More and more IBS current modules are used here.
BCM to state the status of lead-acid batteries
Figure 1 Typical 12V system wiring diagram
We need to consider here:
1) Does the power of the generator exceed the demand for electricity?
A: Need, there are dynamic and static, different driving curves and summer and winter differences.
2) Does the generator overcharge after causing excessive power?
A: Overcharge is not a good thing for lead-acid batteries, it also causes energy release.
3) What problems caused after the battery is overcharged?
A: The life is reduced, the fuel consumption is increased, and the battery voltage is high.
Figure 2 Intelligent control of 12V system
In fact, we generally consider static and dynamic requirements to consider:
The power of the traditional vehicle can be separated, from the open and the non-open two large states.
PT section
Other parts of the vehicle
We generally separate the new energy vehicles separately because it is quite special.
New energy is also divided into different states of the system
The charging of new energy is actually quite special.
Figure 3 12V load distribution
The load table can refer to the following situation, we have to consider
Normal power and highest power
Consider using load
To consider compliance changes at different temperatures
Table 1 12V system power meter
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