Abstract
Indirect tire pressure monitoring method (ITPMS) is based on the wheel speed signal differences indirectly infer that the change of the tire pressure. In the steering mode, there is a large yaw rate, and there is a big deviation between the four wheels’ speed. The traditional indirect tire pressure monitoring method based on wheel speed comparison method is invalid. That the automobiles which is matched electronic stability control system estimate the four-wheel speed according to the yaw rate and steering wheel angle become an important method to improve the accuracy of Indirect tire pressure monitoring. Four-wheel vehicle kinematics model for turning condition is established to compensate for the wheel speed in the steering mode, avoid the misjudgment of indirect tire pressure monitoring system. The seven degree of freedom vehicle model and the four wheel speed model are established firstly, and analyse the four wheel speed change of the vehicle under the condition of a certain corner input in the simulation. Then conduct a test on the vehicle road, calculated using the four wheel speed distribution module model of vehicle wheel speed on the theoretical value of the actual value of the wheel speed compensation, so it can monitor the tire pressure in turning vehicle. When the error of the wheel speed is beyond the threshold, the wheel can be judged to be in the state of lack of gas.
Highlights
Introduction iTire pressure monitoring system is one of the most important vehicle safety systems, which can reduce vehicle safety problems and reduce traffic accidents
As can be seen from the diagram, when the vehicle turns left, the left front wheel and left rear wheel speed are less than 5.4m/s, and the right front wheel and right rear wheel speed are greater than 5.4m/s
We can see that the left front wheel turning speed relative error exceeds the threshold from the figure, we can judge the left front gas shortage. It can be concluded from the experiment that the wheel speed of each wheel varies greatly during cornering, so the wheel speed is judged to be abnormal when cornering, which results in the failure of the tire pressure monitoring system
Summary
Tire pressure monitoring system is one of the most important vehicle safety systems, which can reduce vehicle safety problems and reduce traffic accidents. By calculating the effective tire rotation radius to monitor tire pressure, this method uses wheel speed signal of vehicle wheel speed sensor directly. The most mature indirect tire pressure monitoring solution is the rotation radius method. It can improve the traditional indirect tire pressure monitoring function, and enrich the monitoring range of the tire pressure monitoring method with rotary radius method. The main method is to obtain the steering angle, yaw angle and other signals of the vehicle through the seven degree of freedom vehicle model. The tire pressure monitoring method of traditional pulse comparison method is used to correct the rear wheel speed and realize the tire pressure monitoring under cornering conditions
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