The method of reading and displaying the car information of the obd device through the serial port

Abstract

The invention provides a method for reading vehicle information of an OBD (on-board diagnostics) device through a serial port and displaying the vehicle information. The method is applied to a system,and the system comprises an OBD device, a vehicle-machine system, a vehicle-machine system application installed in the vehicle-machine system, a background server, and a client-side mini applicationinstalled in a client side. The client-side mini application sends a specific vehicle information acquisition request corresponding to an UUID (universally unique identifier) of a user to the background server according to an instruction input by the user; the client-side mini application displays received specific vehicle information through an interface. The method has the advantages that the information of the OBD device can be acquired in real time, and after the information is sent to the background server for filtering, verifying, analyzing and storing, secondary data processing is further carried out to acquire more information; data are displayed by the client-side mini application, the user can check condition information of a vehicle at any time via the client-side mini application only by installing the client side, and accordingly, convenience is brought to the user.

Description

technical field [0001] The invention belongs to the technical field of vehicle information acquisition and display, and in particular relates to a method for reading and displaying vehicle information of an OBD device through a serial port. Background technique [0002] Nowadays, more and more car machine manufacturers use Android system to design car machine systems. Using Android system is not only because it is an open system and the cost is very low, but also because Android system is very popular on mobile devices now, making it in It is very convenient and fast to develop various applications, and the stability and operability are very good. The car-machine system can easily display various information to users. However, the instruments that come with the car itself show very little information to the user, so the car-machine system can make up for this part of the defect. For example, if the car is short of fuel, it can be displayed to the user through the instrument...

AI Technical Summary

Problems solved by technology

[0004] The content recorded in the above patent application mainly has the following three disadvantages: First, the data access module must pass the TCP protocol to connect with the OBD device, but the transmission method based on the TCP / IP protocol requires a relatively complicated handshake process, and requires a lot of time. The communication flow of users is more, and the transmission process is more complicated. If the signal is not good, it is difficult to collect OBD information in real time. Secondary processing, so some useful information cannot be obtained

[0006] The content recorded in the above-mentioned patent application mainly has the following three disadvantages: one is that the present invention reads the vehicle state data through the OBD port, and does not indicate which specific method or protocol is used to read the data; the other is that the server receives the data sent by the OBD device. After the vehicle status data, it is only converted into predetermined format information without secondary processing, so some in-depth data information cannot be obtained, such as last trip information, braking times, fuel consumption information for each trip, etc., etc. The OBD data cannot be obtained only by reading the OBD data; the third is to use the mobile terminal to display information, but the detailed display method is not mentioned, and this display method is also limited to the application program of the car-machine system, and cannot be separated from the car-machine system. In the case of the system, continue to query the status information of the car, even if it is an app that can be separated from the car-machine system, but users may not be easy to obtain it, or are willing to install such an app on their mobile phones

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