Method for providing signals for vehicle-mounted inertial navigation based on vehicle diagnose interface

Abstract

The invention provides a method for providing signals for vehicle-mounted inertial navigation based on a vehicle diagnose interface. The vehicle speed, the current gear status information and the like are acquired by a vehicle-mounted automatic diagnostic system, a vehicle speed pulse signal line and a vehicle backing signal line are replaced, a vehicle speed value is acquired after a signal of the vehicle-mounted automatic diagnostic system is analyzed, and compared with vehicle speed acquisition, the pulse error can be reduced; the vehicle backing signal is numerical and can be used for programming directly; the Baud rate is 500kbps, an inertial navigation sends a request (communication protocol of the vehicle speed), the vehicle-mounted automatic diagnostic system receives the request and can respond at regular intervals, the byte at the designated position in the responded communication protocol is the vehicle speed value, and the issue of positive and negative values of the vehicle speed is solved through the gear status of the vehicle. The method has the advantages of reducing the technical difficulty, no requirement for vehicle refitting and achieving safety and rapidness in installation.

Description

technical field [0001] The invention relates to the field of vehicle navigation, in particular to a method for providing signals for vehicle inertial navigation based on a vehicle diagnosis interface. Background technique [0002] With the rapid development of automobiles, in the existing vehicle positioning and navigation technologies, some end users choose to use vehicle navigation with inertial navigation because they are not satisfied with the inaccurate positioning of GPS-based vehicle navigation when GPS signals are missing. It makes up for some shortcomings of GPS car navigation very well. [0003] Although the car navigation with inertial navigation has the above advantages, it needs the vehicle speed pulse signal and the reversing signal to operate normally. However, the vehicle speed pulse signal line is not easy to obtain, and it will be troublesome to install. The loading rate of car navigation with inertial navigation has a certain impact. [0004] The vehicle...

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a method for providing signals for vehicle inertial navigation based on the vehicle diagnostic interface, characterized in that: the method for providing signals for vehicle inertial navigation based on the vehicle diagnostic interface obtains the vehicle speed and current gear through the vehicle automatic diagnosis system Bit status information, etc., replacing the vehicle speed pulse signal line and reversing signal line; after the on-board automatic diagnosis system is introduced as a vehicle standard, the vehicle is equipped with a standard on-board automatic diagnosis system interface, and the standard 16PIN on-board automatic diagnosis system physical interface can lead out Vehicle automatic diagnosis system signals, by analyzing these signals, we can get the information we want, which solves the problem that it is inconvenient to obtain the vehicle speed signal line when the vehicle navigation with inertial navigation is installed

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