车辆制动性.m

计算汽车的动力性、经济性和制动性,涉及最高车速、加速时间、最大爬坡度、百公里油耗、制动距离

clear
clc
m=[4080 9290];
hg=[0.845 1.170];
L=3.950;
a=[2.100 2.950];
blta=0.38;
z=0:0.01:1;
b=L-a;
phy=0.8;
ua=30;
g=9.8;
t2=0.02;
t22=0.02;
phy_f=ones(2,length(z));
phy_r=ones(2,length(z));
for i=1:length(z)
phy_f(:,i)=blta*z(i)*L./(b+z(i)*hg);
phy_r(:,i)=(1-blta)*z(i)*L./(a-z(i)*hg);
end
z1=0.2:0.01:0.8;
phy1=(z1+0.07)/0.85;
z2=0.3:0.01:0.8;
phy2=(z2-0.02)/0.74;
z3=0.15:0.01:0.3;
phy3=z3+0.08;
phy4=z3-0.08;
plot(z,phy_r(1,:),'b',z,phy_f(2,:),'k',z,phy_r(2,:),'g',z,z,'y',z1,phy1,'--',z2,phy2,'--',z3,phy3,'--',z3,phy4,'--')
E_f=ones(2,length(z));
E_r=ones(2,length(z));
for i=1:length(z)
E_f(:,i)=100*b./(blta*L-phy_f(:,i)'.*hg);
E_r(:,i)=100*a./((1-blta)*L+phy_r(:,i)'.*hg);
end
plot(phy_r(1,:),E_r(1,:),'b',phy_f(2,:),E_f(2,:),'k',phy_r(2,:),E_r(2,:),'g')
phy0=(L*blta-b)./hg;
% F_xb1=blta*phy.*m*g.*a./(L-blta*L+phy.*hg);
% a_m=F_xb1/blta./m/g;
F_xb1=g*m.*b*phy./(L-phy.*hg);
a_m=F_xb1./m/g;
% F_xb2=phy.*m*g.*a./(L+phy.*hg);
% a_m=F_xb2./m/g;
s=(t2+t22/2)*ua/3.6+ua^2./a_m/25.92/g;
% fplot(phy_f(1),0,1)
% hold on
% fplot(phy_f(2),0,1)
% hold on
% fplot(phy_r(1),0,1)
% hold on
% fplot(phy_r(2),0,1)
% axis([0,1,0,1])