汽车课设货车Matlab爬坡度图程序(需改发动机扭矩转速和变速箱传动比).doc

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1、汽车爬坡度图clcclearallTtq=[498,580,660,700,690,685,680,680,675,672,665,640,610,600];io=3.62;nt=0.9;%机械效率%r=0.423;ma=7800;%汽车总质量%g=9.8;G=ma.*g;f=0.02;n=[1000,1200,1400,1500,1600,1700,1800,1900,2000,2100,2200,2300,2400,2500];ig1=6.25;ua=0.377*r.*n/ig1/io;a=namelengt

2、hmax;a=asin((Ttq.*ig1.*io.*nt/r-(G.*cos(a).*f+3.008*ua.*ua/21.15))/G);i=100*tan(a);plot(ua,i);holdon;ig2=3.94;ua=0.377*r.*n/ig2/io;a=namelengthmax;a=asin((Ttq.*ig2.*io.*nt/r-(G.*cos(a).*f+3.008*ua.*ua/21.15))/G);i=100*tan(a);plot(ua,i);holdon;ig3=2.5;ua=0.377

3、*r.*n/ig3/io;a=namelengthmax;a=asin((Ttq.*ig3.*io.*nt/r-(G.*cos(a).*f+3.008*ua.*ua/21.15))/G);i=100*tan(a);plot(ua,i);holdon;ig4=1.58;ua=0.377*r.*n/ig4/io;a=namelengthmax;a=asin((Ttq.*ig4.*io.*nt/r-(G.*cos(a).*f+3.008*ua.*ua/21.15))/G);i=100*tan(a);plot(ua,i)

4、;holdon;ig5=1;ua=0.377*r.*n/ig5/io;a=namelengthmax;a=asin((Ttq.*ig5.*io.*nt/r-(G.*cos(a).*f+3.008*ua.*ua/21.15))/G);i=100*tan(a);plot(ua,i);title('汽车爬坡度图i-ua');xlabel('ua(km/h)');ylabel('i(%)');