【作者】 张利鹏；

【导师】 韩宗奇；

【作者基本信息】 燕山大学 ， 车辆工程， 2004， 硕士

【摘要】 车辆在转弯制动过程中同时施加制动，是一种复杂且危险的工况。在这一过程中所发生的侧滑、激转和轨道偏离常常是行车事故的主要原因。本文针对该工况进行了专题研究。 由于轮胎在转弯制动工况下的附着特性是研究整车性能的关键所在，所以，本文首先在前人所建立的轮胎力学模型的基础上，根据大量的轮胎试验数据，运用统计拟合方法建立了轮胎转弯制动附着特性力学模型。该模型计算简单，拟合精度高，与实际情况接近，对汽车动力学模拟计算比较合适。 目前，国内对制动防抱死系统(ABS)的理论研究还不够充分，对其在特定工况中的具体表现尚缺乏足够的认识。为解决制动器制动力的控制问题，本文提出了一种新的防抱死控制方式，并利用该方式对汽车进行紧急制动仿真，取得了较好的效果。 本文对汽车转弯制动工况作了深入的理论分析。在所建立的轮胎力学模型的基础上，建立了整车十自由度数学模型和仿真模型，并以捷达前卫轿车为例进行了转弯制动工况仿真分析，验证了所建模型的可行性。可以利用所建模型在汽车设计初期对其制动性和操纵稳定性进行预测和有关指标的评价，缩短研发周期。 最后，本文对转弯制动时未安装ABS和安装ABS两种情况的仿真结果作了比较，证明了ABS对提高车辆的制动性和操纵稳定性有很大帮助，为ABS在汽车上的普遍安装提供了理论依据。更多还原

【Abstract】 Appling brake force when vehicle in cornering is a complicated and dangerous situation. Sideslip, sharp steer and obit deviation are the often occurrence of accidents during this process. So this paper makes a special research for such situation.The adhesive characteristics of tires in cornering with braking are the bottlenecks in the research of entire car performance. So on the basis of the tire mechanical models founded by predecessors and numerous experimental data, a tire mechanical model set up by using statistical fitting methods. The calculation of the model is simple. The fitting result is at the approach to the practical situation. So the model can be used in the simulating calculation of vehicle dynamics.Nowadays, in domestic, the theory research and the knowledge of ABS concrete role in special situation are not enough. In order to find a solution to control the detent brake force, the paper propounded a new anti-lock control method and made use of the method to simulate the emergency braking of vehicles. The desired result has achieved.The paper makes an intensive theoretic study on vehicles in cornering with braking. On the basis of the tire model, ten-freedom degrees vehicle model was set up. By the use of the car Jetta Vanguard as an example, simulating analysis of vehicle in cornering with braking was carried out. The result has shown that the simulation model built up by this paper is feasible. The model can be used to pre-estimate braking ability and direction stability of vehicles in the early days of design, shorten the periods of research and development.At last, by making comparison of the simulation results betweenuninstalled ABS and installed ABS, the biggish bestead of ABS to braking ability and direction stability of vehicles was certified. It proffers a theoretical thereunder to in general use ABS in vehicles.更多还原