Research On The Identification Of Longitudinal Driving Safety Domain For Large Bus Based On DSP

Automobile safety is an eternal subject for the development of road traffic. With therapid development of highway and the fast increase of automobile ownership in our country,aided driving technology occur at this moment when traffic safety problems are increasinglyprominent. Aided driving technology is the combination of multi-courses which includeartificial intelligence, vehicle engineering, computer information technology and so on.Moreover, it is also an important development direction of intelligent transportation system.As an important part of aided driving technology, longitudinal anti collision warning systemof big bus could warn the driver of the dangerous information in front of the car, and thenimprove the active safety of big bus. The ability to recognize the longitudinal driving safetydistance could provide real theory and technology support for longitudinal anti collisionwarning system of big bus, which is worth to be researched.The paper which was based on the national natural science fund projects—research ofdangerous driving behavior identification mainly studied the longitudinal driving safetydistance technology of big bus which was based on DSP. And the main content is as follows.For gathering parameters for buses with state real-time issues and problems caused bythe high cost of using GPS or radar equipment, this article designed a big bus driving stateparameters in real time acquisition system based on the Freescale’s MC9S12XS128microcontroller. This system included hardware and software design. Then bus driving stateparameters was transferred to the high-speed processor through serial communication, whichprovided relevant parameters for the identification of bus longitudinal driving safety range.In view of problems of simple model of typical longitudinal control domain model whichhad been illustrated in the paper, and failing to fully consider the impacts of buses and roadenvironment., the paper built the dynamic model and tire model of buses, and set up thecalculating model of longitudinal control domain in emergency, combined the relation of thefront motion and latter motion of buses.The paper studied the identification problem of longitudinal driving safety domain ofbuses, and according to the impact of air condition and road alignment on it, built thelongitudinal driving safety domain model, and analyzed the relations among the speed of thiscar and the front of it and the security domain of both cars, and finally, conducted thenumerical simulation of identification of longitudinal driving security domain of buses.