Algorithm and device for judging vehicle driving state by using accelerometer

Abstract

The invention discloses an algorithm and a device for judging a vehicle driving state by using an accelerometer. The algorithm comprises the following steps: continuously acquiring a first acceleratedspeed vector of a vehicle to be identified collected by a triaxial accelerometer in real time; continuously calculating a quaternion of a gradual approach expected quaternion in real time, revolvingthe first accelerated speed vector according to the quaternion, wherein the quaternion represents a vehicle posture; performing yaw correction on the revolved accelerated speed vector; comparing the corrected accelerated speed vector with an accelerated speed vector threshold value, according to a comparing result, identifying a current driving behavior of the vehicle to be identified. Because a gradual approach technology is continuously used in a using process, the algorithm is capable of adapting various application scenes better: multiple pavement conditions, such as horizontal, ramp or jolt, and scenes, such as a relative placing angle between the triaxial accelerometer and the vehicle to be identified is changed, and a measuring error exists in the triaxial accelerometer; in addition, the algorithm does not need an initialization process, and is out of the box.

Description

Technical field [0001] The present invention relates to a driving state of the vehicle identification field, in particular it relates to a method and a device using an accelerometer determines the running state of the vehicle. Background technique [0002] Driving behavior refers to the different behavior of the driver in driving a vehicle control process according to the vehicle driving conditions, road conditions around the vehicle to make. Driving behavior directly affects road traffic safety, statistics show that traffic accidents occur each year in our country, a considerable proportion is due to the driver's driving behavior lead to improper driving. Correctly identify the driving behavior of the driver, and to give incentives, thereby reducing the accident rate has great social significance. Fixed on the car phone a stable place, read the phone triaxial accelerometer output, solves for each direction of the car's acceleration, and then identify whether there is fierce brak...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an algorithm and device for judging the driving state of a vehicle using an accelerometer, aiming to solve the technical problem that the initialization process in the prior art cannot eliminate the tilt error more accurately

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