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在设计汽车和进行牵引性能分析时,须要用一系列公式来进行牵引计算,甚为繁杂。本文以图解法来表明汽车及其发动机的动力参数之间的相互关系,以便能迅速地求得牵引计算所需要的数据。而且可以由发动机的扭矩或功率外特性直接作用于汽车的牵引特性和动力特性。一、基本关系图解法是在一系列计算公式的基础上建立起来的。为此,首先研究下面一些有助于建立图解方法的动力参数关系式。汽车的总牵引力P_a 是用来克服汽车的传动阻力P_m、空气阻力P_w、道路阻力P_ψ和加速阻力P_j。它们之间的平衡方程式表示为P_a=P_m+P_w+P_ψ+P_j 公斤(1)从汽车的总牵引力中减掉传动阻力,则为驱动轮上的牵引力P_k,故得出P_k=P_a-P_m=P_w+P_ψ+P_j 公斤(2)
In the design of the car and the traction performance analysis, the need to use a series of formulas for traction calculation, very complicated. In this paper, the relationship between the dynamic parameters of a car and its engine is illustrated graphically so that the data required for the traction calculation can be quickly obtained. But also can be directly affected by the torque or power of the engine traction characteristics and dynamic characteristics of the car. First, the basic relationship diagram method is based on a series of formulas established. To do this, first investigate some of the following dynamic parameter relationships that help to establish the graphical approach. The total traction of the car P_a is used to overcome the car’s transmission resistance P_m, air resistance P_w, road resistance P_ψ and acceleration resistance P_j. The equilibrium equation between them is expressed as P_a = P_m + P_w + P_ψ + P_j kg (1) From the total traction force of the car minus the transmission resistance, the traction on the drive wheel P_k, it concluded P_k = P_a-P_m = P_w + P_ψ + P_j kg (2)