液力变矩器与发动机共同作用曲线绘制――毛明哲

1、发动机和液力变矩器共同工作输入特性和输出特性曲线图图形如下为了保证图形美观，以下四幅图每个图的部分指标的数量级有所改变。程序如下：第一幅图绘制Ne=800:100:2200;Ne=Ne,2500;Me=2513.3,2657.9,2780,2879.6,2956.8,3011.4,3043.6,3053.3,3040.5,3005.3,2947.4,2867.2,2764.4,2639.2,2491.5,0fori=1:16Pe(i)=Me(i)*Ne(i)/9549;end;plot(Ne,Pe*5,Ne,Me);title(发动机净外特性曲线);xlabel(转速ne);ylabel(转矩

2、 Me/(N*m）功率Pe/kW);第二幅图绘制I=0,0.387,0.435,0.510,0.595,0.641,0.7,0.757,0.784,0.805,0.853,0.901,0.946;K=2.54,1.77,1.69,1.55,1.38,1.30,1.20,1.09,1.04,1.00,1.00,1.01,1.03;Xb=3.05,2.77,2.71,2.62,2.52,2.45,2.34,2.22,2.13,2.04,1.62,1.12,0.62;NN=0.00,0.69,0.73,0.79,0.82,0.83,0.84,0.83,0.81,0.81,0.85,0.91,0.97

3、;plot(I,K,I,Xb,I,NN*3);gtext(K);gtext(转矩系数);gtext(效率);第三幅图及第四幅图绘制Me=2513.3,2657.9,2780,2879.6,2956.8,3011.4,3043.6,3053.3,3040.5,3005.3,2947.4,2867.2,2764.4,2639.2,2491.5,0 %发动机的原始转矩%传递到泵轮的转矩I=0,0.387,0.435,0.510,0.595,0.641,0.7,0.757,0.784,0.805,0.853,0.901,0.946; %变矩器工况K=2.54,1.77,1.69,1.55,1.38,1

4、.30,1.20,1.09,1.04,1.00,1.00,1.01,1.03; %变矩比Ne=800:100:2200;Ne=Ne,2500;Xb=3.05,2.77,2.71,2.62,2.52,2.45,2.34,2.22,2.13,2.04,1.62,1.12,0.62; %泵轮转矩系数NN=0.00,0.69,0.73,0.79,0.82,0.83,0.84,0.83,0.81,0.81,0.85,0.91,0.97;%效率Nb=Ne/0.67; %发动机对应的泵轮转速plot(Nb,Mb1);hold on;for j=1:13fori=1:16 Mb2(i)=Xb(j)*860*9

5、.8*Nb(i)*Nb(i)*0.01024*1e-6; %利用公式求不同的变矩器工况对应的泵轮转矩end;%下面求交点 for k=2600:3600; %采用步长为1的试凑，范围之前是1到10000经过看图发现交点集中于2600到3600之间。 z1=interp1(Nb,Mb1,k); z2=interp1(Nb,Mb2,k); if abs(z1-z2)=0.01 %两个值之差小于0.01 说明近似相等 X(j)=k; % X Y 为交点的横坐标（Nb） Y为交点纵坐标（Mb）；Y(j)=z1;end;end;plot(Nb,Mb2);hold on;end;figure(2);% 下面求发动机和液力变矩器共同工作时的输出特性for j=1:13Nt(j)=X(j)*I(j);Mt(j)=K(j)*Y(j);Pt(j)=Mt(j