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1、汽车功率平衡图程序 n=600:10:4000; Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).2+40.874*(n/1000).3- 3.8445*(n/1000).4; m=3880;g=9.8; 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; ua1=0.377*r*n/ig(1)/i0; ua2=0.377*r*n/
2、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; Pe1=Tq.*ig(1)*i0.*ua1./(3600*r); Pe2=Tq.*ig(2)*i0.*ua2./(3600*r); Pe3=Tq.*ig(3)*i0.*ua3./(3600*r); Pe4=Tq.*ig(4)*i0.*ua4./(3600*r); Pe5=Tq.*ig(5)*i0.*ua5./(3600*r); ua=0:0.35:119; Ff=G*f; Fw=CDA*ua.2/21.15; Pf=Ff*ua/36
3、00; Pw=Fw.*ua/3600; Pe0=(Pf+Pw)./nT; Pe=max(Pe1); plot(ua1,Pe1,ua2,Pe2,ua3,Pe3,ua4,Pe4,ua5,Pe5,ua,Pe0,ua,Pe); axis(0 119 0 100); title(汽车功率平衡图); xlabel(ua(km/h); ylabel(Pe(kw); gtext(1), gtext(2), gtext(3), gtext(4), gtext(5), gtext(Pf+Pw)/et),gtext(Pe); 最高档与次高档的等速百公里油耗曲线程序：n=600:1:4000; m=3880;g=9.
4、8; 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; n0=815 1207 1614 2012 2603 3006 3403 3804; B00=1326.8 1354.7 1284.4 1122.9 1141.0 1051.2 1233.9 1129.7; B10=-416.46 -303.98 -189.75 -121.59 -98.893 -73.714 -84.
5、478 -45.291; B20=72.379 36.657 14.524 7.0035 4.4763 2.8593 2.9788 0.71113; B30=-5.8629 -2.0553 -0.51184 -0.18517 -0.091077 -0.05138 -0.047449 -0.00075215; B40=0.17768 0.043072 0.0068164 0.0018555 0.00068906 0.00035032 0.00028230 - 0.000038568; B0=spline(n0,B00,n); B1=spline(n0,B10,n); B2=spline(n0,B
6、20,n); B3=spline(n0,B30,n); B4=spline(n0,B40,n); Ff=G*f; ua4=0.377*r*n/ig(4)/i0; ua5=0.377*r*n/ig(5)/i0; Fz4=Ff+CDA*(ua4.2)/21.15; Fz5=Ff+CDA*(ua5.2)/21.15; Pe4=Fz4.*ua4./(nT*3.6*1000); Pe5=Fz5.*ua5./(nT*3.6*1000); for i=1:1:3401 b4(i)=B0(i)+B1(i)*Pe4(i)+B2(i)*Pe4(i).2+B3(i)*Pe4(i).3+B4(i)*Pe4(i).4; b5(i)=B0(i)+B1(i)*Pe5(i)+B2(i)*Pe5(i).2+B3(i)*Pe5(i).3+B4(i)*Pe5(i).4; end pg=7.0; Q4=Pe4.*b4./(1.02.*ua4.*pg); Q5=Pe5.*b5./(1.02.*ua5.*pg); plot(ua4,Q4,ua5,Q5); axis(0 100 10 30); title(最高档与次高档等速百公里油耗曲线); xlabel(ua(km/h); ylabel(百公里油耗（L/100km）); gtext(4), gtext(5);
