We know that the aircraft's black box can record all flight conditions and is an important source of data for aircraft maintenance and accident analysis. Now that the Internet of Vehicles is popular, OBD has begun to enter everyone's field of vision. Is OBD able to record all driving data like the black box of an airplane? What is the role of vehicle OBD?
What is OBD?
The full name of OBD is on-borad diagnosTIcs. The industry is often called the on-board diagnostic system. It was originally designed as a professional instrument for 4S shop to detect engine faults and exhaust emissions. With the development of technology, it has become popular and can be purchased and used by ordinary car owners. Simply plug the wireless adapter into the OBD interface, you can automatically read the data, connect to the mobile phone via Bluetooth, and open the mobile app to view the data. In addition to the fuel consumption display, there are real-time driving data display, travel cost analysis, engine fault detection and maintenance reminders.
The vehicle OBD can also display the real-time driving information. Only the engine needs to be started, and the adapter will automatically connect with the mobile phone. Through the mobile APP, you can see real-time fuel consumption, engine speed, water temperature, speed and other data, all digital real-time display, very convenient to read. In addition, there is a voice broadcast function, so that the owner can grasp the driving condition of the vehicle all the time.
In addition to the above functions, the vehicle OBD also has an intelligent positioner that records the trajectory of the vehicle. The new sensing function monitors the movement of the vehicle during driving, for example, when the fuel consumption is the lowest or highest, and when there is a sudden braking. Wait, it will be recorded and summarized. In addition, there is also the fuel consumption that everyone is most concerned about. The mobile app will automatically calculate the travel cost based on the pre-entered oil price combined with the average fuel consumption per trip.
At the same time, the vehicle OBD can not only automatically detect, but also directly display what is wrong with the engine. In this way, the owner can call the technical maintenance master in time according to the prompt failure, whether the vehicle can still drive normally or how to deal with it.
The vehicle OBD can also remotely monitor the vehicle by means of cloud technology according to the demand. It has anti-theft positioning, remote detection engine, electronic dog and illegal inquiry, etc., and the function is more comprehensive.
The implementation of these functions requires the acquisition of relevant data through the OBD interface. This is mainly through the CAN bus to achieve data interaction, of course, some models are not through the CAN bus, but the principle is the same.
What data is collected by the OBD interface?
1. CAN bus data
The CAN bus data is the data required for the interaction of the various control modules. 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 to the automatic transmission, so the engine control module will send this signal to the CAN bus, and the transmission control module reads in real time. Take this signal.
Because the bus data is used for interaction, the data stream is always on the bus, so collecting the data is just a matter of reading it. The principle is relatively simple, you can find a lot of information by searching a search, it is not expanded here.
The data on the CAN bus has been enriched: vehicle speed, various temperatures, wheel speed, engine torque, throttle, brake pedal, gear lever position, air conditioning and other equipment work, fault information ... very much. The characteristics of these signals are generally: the data used by different control modules.
2. Controller internal data
To put it simply, the CAN bus gives you 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 can be collected, and almost all data can be collected. Because there are more actions to send commands, it is more resource intensive. This kind of data is much richer than the former. But only the developer can know how to configure to collect this data.
Being able to record any data does not mean that all data can be recorded. Especially for the controller data, the amount that can be read is too much. Even if you buy the most expensive equipment, you can only record a small portion because of the limited bandwidth. The acquisition of internal data from the controller is also related to the capabilities of the controller itself. The controller of the product car is weaker and can collect less data at the same time. Vehicles used for development will use a more powerful controller.
In general, you can get two main data from the OBD interface, one is specified in the OBD standard, and the other is the manufacturer's proprietary data. The manufacturer's proprietary data generally needs to be agreed by the manufacturer or something like mid. Can get it.
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