Hongying Shan

Simulation analysis of error correction method of headlamp detection based on driving direction

At present, the elimination of headlamp detection error is to straighten the test-waiting vehicle, namely the straightening device makes the vehicle body axis to be right with headlight detector at the distance required. However, the headlamp illumination direction should be the vehicles driving direction and the perpendicular direction of rear axle is the vehicles driving direction, so the detection benchmark to headlamp should be the vehicles driving direction. This paper proposes a new method of error correction of headlamp detection based on bias angle identification of axle placed. Firstly, this paper establishes a tire model, and carries out research on modeling and simulating bias angle of tire, then make error analysis of bias angle identification. Simulation analysis shows that when changes some influence factors, for example tire size, shape, and convex volume, the device is still of high accuracy, so the method is feasible. This paper also establishes the experimental system of detecting axle bias angle, furthermore makes a test and error analysis pointing to the system. The result verifies the simulation conclusions.

Research on Detecting and Simulating of Deflective Angle of Axle Placed

This paper makes simulation and analysis of tire profile identification of the wheel model, the key technology of the tire identification is to determine the effective boundary of tire profile by the means of gradient judgment, to calculate axle deflective angle according to common tangent line between two effective smooth curves in tire profile, then to apply iterative contour matching method to get more accurate value. Finally, as to several scanning heights of laser range finder and deflective angles of placed axle, respectively conducts a comparative analysis of detection error. The experimental result shows that the tire profile identification method is correct and effectively, the device can accurately and fast detect the deflective angle of car axle relative to the headlamp detection baseline, and simultaneously compensate the headlamp detection error, so it is with great value of promotion and application.

Study of Detecting Method of Automobile Wheelbase Difference Based on Piezoelectric Signal

The wheelbase difference will produce a great influence on automobile performance, and will bring up the huge economic losses and driving risks if it exceeds a certain limit, so it is significant reality important to detect vehicle wheelbase difference. The paper puts forward new detecting method of automobile wheelbase difference based on piezoelectric tire print, and builds up the mathematical model of detecting and error compensation on the base of relative measurement theory. After designing the detecting device with the dual trapezoidal bottom slot, carried out experimental analysis pointing to detecting accuracy of wheel horizontal position, the result indicates that this device can make precise measurement and achieve error compensation under the curve driving condition. Finally, through carrying out practical detecting, data statistical analysis proves that the detecting system has the good characteristic of repeatability and stability, and can realize accurate detecting. The detecting device of wheelbase difference has the feature of high accuracy and low cost, therefore the device is with good application value.