汽车驱动力-行驶阻力平衡图m=3880;
g=9.8;
nmin=600;nmax=4000;
G=m*g;
ig=[5.56 2.769 1.644 1.00 0.793];
nT=0.85;
r=0.367;
f=0.013;
CDA=2.77;
i0=5.83;
L=3.2;
a=1.947;
hg=0.9;
If=0.218;Iw1=1.798;Iw2=3.598;
n=600:10:4000;
Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1 000).^4;
Ft1=Tq*ig(1)*i0*nT/r;
Ft2=Tq*ig(2)*i0*nT/r;
Ft3=Tq*ig(3)*i0*nT/r;
Ft4=Tq*ig(4)*i0*nT/r;
Ft5=Tq*ig(5)*i0*nT/r;
ua1=0.377*r*n/ig(1)/i0;
ua2=0.377*r*n/ig(2)/i0;
ua3=0.377*r*n/ig(3)/i0;
ua4=0.377*r*n/ig(4)/i0;
ua5=0.377*r*n/ig(5)/i0;
ua=0:5:120;
Ff=G*f;
Fw=CDA*ua.^2/21.15;
Fz=Ff+Fw;
plot(ua1,Ft1,ua2,Ft2,ua3,Ft3,ua4,Ft4,ua5,Ft5,ua,Fz);
title('汽车驱动力-行驶阻力平衡图');
xlabel('ua(km*h^-1)');
ylabel('Ft/N');
gtext('Ft1'),gtext('Ft2'),gtext('Ft3'),gtext('Ft4'),gtext('Ft5'),gtext('Ff+F w');
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