極限狀態(tài)下汽車制動(dòng)性能控制策略研究
[Abstract]:Under the limit braking condition, the control strategy of the vehicle is the key research topic of the vehicle braking performance. The application of automobile anti-lock braking system (Anti-lock Braking System,ABS) can greatly improve the braking safety performance of automobile. As an important brake safety control mechanism, it can control the pressure of the wheel brake hydraulic cylinder when the automobile meets the emergency brake situation, so as to adjust the brake pressure, prevent the sideslip, tail flick, and shorten the braking distance. Finally, the direction stability of vehicle braking is guaranteed and the braking performance is improved. Nowadays, ABS is an effective vehicle braking standard configuration, and many researches on ABS control strategy have been carried out. However, under the limit braking condition, the braking distance will be prolonged, the possibility of running deviation will be increased, the braking effect will be affected, how to optimize the control strategy of the ABS mechanism and combine with the auxiliary brake mechanism, To improve the braking efficiency to the greatest extent will become the focus of future research. Firstly, the research significance, basic results and working principle of ABS system are expounded. The present situation and development trend of automobile ABS control strategy at home and abroad are summarized, and the influence of existing ABS control strategy on braking performance is compared and analyzed. The necessity and feasibility of improving ABS control method are clarified. In the process of establishing the model, Carsim software based on parametric modeling is used to establish the three-dimensional simulation model of the whole car dynamics, and the PID logic threshold ABS controller and the fuzzy PID controller based on slip ratio error are designed respectively. The ice and snow pavement is constructed, the road surface is separated from the emergency braking condition and combined braking and anti-lock control is carried out. The evaluation standards of lateral displacement and braking distance are compared with the braking performance of the vehicle equipped with the original ABS controller. To verify the effectiveness of the improved ABS controller. The auxiliary braking mechanism is designed, the emergency braking condition of ice and snow pavement is constructed, the vertical acceleration, braking track and braking distance are tested, and the effectiveness of the auxiliary braking mechanism is verified. The simulation results show that the designed PID logic threshold ABS controller and fuzzy PID controller based on slip error can effectively improve the braking effect of the vehicle under the limit condition and greatly improve the handling stability and driving safety of the vehicle. The auxiliary braking mechanism achieves shorter braking distance and better directional stability, and does not affect the normal running of the vehicle.
【學(xué)位授予單位】:天津職業(yè)技術(shù)師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:U463.5
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