为研究驱动力矩对汽车动力学稳定性的影响,以引入驱动力矩的5自由度汽车二维非线性动力学模型为基础,利用前轮转角作为中间变量,建立了相应的7自由度自治系统模型,分析了不同驱动方式下,驱动力矩对汽车转向驱动分岔的动力学特征的影响.以前轮驱动汽车为例,利用相空间、状态变量时间序列、功率谱密度和李雅普诺夫指数分析了驱动力矩对转向驱动分岔特征影响的动力学演变过程.结果表明:驱动力矩的大小将直接影响汽车动力学系统的分岔特征,在分析汽车的动力学分岔特征时应同时考虑前轮转角和驱动力矩两个分岔参数的影响.%To study the effects of driving torque on vehicle dynamics stability, on the basis of five degree of freedom (5 DOF), two dimensional nonlinear dynamics model of vehicle with driving torque involved, and using the steering angle of front wheel as an intermediate variable, a corresponding 7 DOF autonomous system model is estab-lished for analyzing the effects of driving torque on the dynamics features of vehicle steering and driving bifurcation under different driving modes. Taking a front-wheel-drive vehicle as an example, the dynamic evolution process of driving torque effects on steering and driving bifurcation is analyzed by using phase space, the time sequence of state variables, power spectral density and Lyapunov exponents. The results show that the magnitude of drive torque di-rectly affects the bifurcation characteristics of vehicle dynamics system, and both bifurcation parameters, i. e. the steering angle of front wheel and driving torque should be concurrently considered in analyzing the dynamic bifurca-tion characteristics of vehicle.
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