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OBD oral data is actually the CAN bus to achieve data interaction. It is true that almost all data is available, but how much you can record depends on the hardware device used for the acquisition.
There are two types of data:
CAN bus data
CAN bus data is the data needed for each control module to interact. For example, the accelerator pedal position signal is transmitted to the engine through the sensor, and this signal is also the most basic input signal for the automatic transmission. Therefore, the engine control module will send this signal to the CAN bus all the time, and the transmission control module reads it in real time. Take this signal.
Because the bus data is used for interaction, the data flow has always been on the bus, so it is only necessary to collect these data to read. The principle is relatively simple and will not be expanded here.
The data on the CAN bus has been relatively rich: vehicle speed, various temperatures, wheel speeds, engine torque, throttle, brake pedal, gear lever position, air conditioning and other various equipment are working, fault information … a lot. The characteristics of these signals are generally: the data required by different control modules.
Controller internal data
To put it simply, the CAN bus provides you with a channel for data circulation. Through this channel, the acquisition device sends instructions to the relevant controller, and the controller returns relevant data. In this way, various variables in the controller software operation can be collected, so almost all data can be collected. Because more instructions are sent, it consumes more resources.