Modeling and analysis about vehicle's longitudinal dynamic performance while sliding on level road

摘要

Sliding is a common behavior used by driver on level road during vehicle operation. So it has practical significance to analyze the variation discipline of sliding vehicle's longitudinal dynamic parameters, such as sliding speed, deceleration rate, coasting resistance (including rolling resistance and air drag) in order to operate vehicle properly and reasonably. Taking some diesel passenger vehicle as experimental object and combining theoretical analysis with experimental verification, thermodynamic models about vehicle's longitudinal dynamic parameters were formulated and developed by use of least square principle and linear regression in this work. The models show that sliding speed and deceleration rate decrease with the sliding time, while coasting resistance and deceleration rate decrease with sliding speed. But the reduction rate of sliding speed and coasting resistance is not consistent. Finally, the accuracy of these models is scrutinized against actual repeated test results from the vehicle. In the final analysis, it is seen that there is an excellent agreement in all of these evaluations.