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Chapter_2_T3.m
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Chapter_2_T3.m
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clear
clc
Loading_weight = 2000;
Curb_weight = 1800;
Total_weight = 3880;
r = 0.367;
Eta_T = 0.85;
f = 0.013;
CDA = 2.77;
i0 = 5.83;
ig = [5.56 2.769 1.644 1.00 0.793];
If = 0.218;
Iw1 = 1.798;
Iw2 = 3.598;
L = 3.2;
a = 1.974;
hg = 0.9;
nmin = 600;
nmax = 4000;
G = Total_weight * 9.8;
n_ = [815 1207 1614 2012 2603 3006 3403 3804];
B_ = [1326.8 1354.7 1284.4 1122.9 1141.0 1051.2 1233.9 1129.7;
-416.46 -303.98 -189.75 -121.59 -98.893 -73.714 -84.478 -45.291;
72.379 36.657 14.524 7.0035 4.4763 2.8593 2.9788 0.71113;
-5.8629 -2.0553 -0.51184 -0.18517 -0.091077 -0.05138 -0.047449 -0.00075215;
0.17768 0.043072 0.0068164 0.0018555 0.00068906 0.00035032 0.00028230 -0.000038568];
roug = 7;
out = ""; % 文字输出
% 求油耗拟合公式
for i = 1:5
now_ig = ig(i);
n = nmin:1:nmax;
ua = 0.377 * r * n / (now_ig * i0);
Ttq = -19.313 + 295.27 * (n / 1000) - 165.44 * (n / 1000).^2 + 40.874 * (n / 1000).^3 - 3.8445 * (n / 1000).^4;
% 利用插值法求拟合公式
ua_ = 0.377 * r * n_ / (now_ig * i0);
Pe = (G * f * ua_ / 3600 + CDA * ua_.^3/76140) / Eta_T;
b_ = zeros(1, 8);
for k = 1:8
b_(k) = B_(:, k)' * [1; Pe(k); Pe(k)^2; Pe(k)^3; Pe(k)^4];
end
ua2b(i, :) = polyfit(ua_, b_, 4);
end
% 计算六工况循环耗油量
% 根据功率平衡图分析，3,4,5档均符合六工况循环条件，顾分别计算
for i = 3:5
Q = [];
% 工况1： 25km/h等速
s = 50; % 行程
ua = 25; % 起始速度
b = polyval(ua2b(i, :), ua);
Ff = G * (f + 0 * ua);
Fw = CDA / 21.15 * ua.^2;
Pf_Pw = (1 / Eta_T) * (Ff * ua / 3600 + Fw * ua / 3600);
Pe = Pf_Pw;
Q(1) = Pe * b * s / (102 * ua * roug);
% 工况2
s = 150; % 行程
ua = 25; % 起始速度
acc = 0.25; % 加速度
Det_t = 1 / (3.6 * acc);
t_ = 7.2:Det_t:23.9;
[~, tsize] = size(t_);
Qs = [];
Qt = [];
for j = 1:tsize
% 因为功率计算公已变，故需重新插值
Derta = 1 + (Iw1 + Iw2) / (Total_weight * r^2) + If * now_ig^2 * i0^2 * Eta_T / (Total_weight * r^2);
Pe = (1 / Eta_T) * (G * (f + 0 * ua) / 3600 + CDA * ua^3/76140 + Derta * Total_weight * ua * acc / 3600);
now_ig = ig(i);
ua__ = 0.377 * r * n_ / (now_ig * i0);
Pe_ = (1 / Eta_T) * (G * (f + 0 * ua__) / 3600 + CDA * ua__.^3/76140 + Derta * Total_weight * ua__ * acc / 3600);
b__ = zeros(1, 8);
for k = 1:8
b__(k) = B_(:, k)' * [1; Pe_(k); Pe_(k)^2; Pe_(k)^3; Pe_(k)^4];
end
ua2bb(:) = polyfit(ua__, b__, 4);
b = polyval(ua2bb(:), ua);
Qt(1) = Pe * b / (361.7 * roug);
ua = ua + 1;
Derta = 1 + (Iw1 + Iw2) / (Total_weight * r^2) + If * now_ig^2 * i0^2 * Eta_T / (Total_weight * r^2);
Pe = (1 / Eta_T) * (G * (f + 0 * ua) / 3600 + CDA * ua^3/76140 + Derta * Total_weight * ua * acc / 3600);
now_ig = ig(i);
ua__ = 0.377 * r * n_ / (now_ig * i0);
Pe_ = (1 / Eta_T) * (G * (f + 0 * ua__) / 3600 + CDA * ua__.^3/76140 + Derta * Total_weight * ua__ * acc / 3600);
b__ = zeros(1, 8);
for k = 1:8
b__(k) = B_(:, k)' * [1; Pe_(k); Pe_(k)^2; Pe_(k)^3; Pe_(k)^4];
end
ua2bb(:) = polyfit(ua__, b__, 4);
b = polyval(ua2bb(:), ua);
Qt(2) = Pe * b / (361.7 * roug);
Qs(j) = 1/2 * (Qt(2) + Qt(1)) * Det_t;
end
Q(2) = sum(Qs);
% 工况3
s = 250; % 行程
ua = 40; % 起始速度
b = polyval(ua2b(i, :), ua);
Ff = G * (f + 0 * ua);
Fw = CDA / 21.15 * ua.^2;
Pf_Pw = (1 / Eta_T) * (Ff * ua / 3600 + Fw * ua / 3600);
Pe = Pf_Pw;
Q(3) = Pe * b * s / (102 * ua * roug);
% 工况4
s = 175; % 行程
ua = 40; % 起始速度
acc = 0.20; % 加速度
Det_t = 1 / (3.6 * acc);
t_ = 46.4:Det_t:60.4;
[~, tsize] = size(t_);
Qs = [];
Qt = [];
for j = 1:tsize
% 重新插值
Derta = 1 + (Iw1 + Iw2) / (Total_weight * r^2) + If * now_ig^2 * i0^2 * Eta_T / (Total_weight * r^2);
Pe = (1 / Eta_T) * (G * (f + 0 * ua) / 3600 + CDA * ua^3/76140 + Derta * Total_weight * ua * acc / 3600);
now_ig = ig(i);
ua__ = 0.377 * r * n_ / (now_ig * i0);
Pe_ = (1 / Eta_T) * (G * (f + 0 * ua__) / 3600 + CDA * ua__.^3/76140 + Derta * Total_weight * ua__ * acc / 3600);
b__ = zeros(1, 8);
for k = 1:8
b__(k) = B_(:, k)' * [1; Pe_(k); Pe_(k)^2; Pe_(k)^3; Pe_(k)^4];
end
ua2bb(:) = polyfit(ua__, b__, 4);
b = polyval(ua2bb(:), ua);
Qt(1) = Pe * b / (361.7 * roug);
ua = ua + 1;
Derta = 1 + (Iw1 + Iw2) / (Total_weight * r^2) + If * now_ig^2 * i0^2 * Eta_T / (Total_weight * r^2);
Pe = (1 / Eta_T) * (G * (f + 0 * ua) / 3600 + CDA * ua^3/76140 + Derta * Total_weight * ua * acc / 3600);
now_ig = ig(i);
ua__ = 0.377 * r * n_ / (now_ig * i0);
Pe_ = (1 / Eta_T) * (G * (f + 0 * ua__) / 3600 + CDA * ua__.^3/76140 + Derta * Total_weight * ua__ * acc / 3600);
b__ = zeros(1, 8);
for k = 1:8
b__(k) = B_(:, k)' * [1; Pe_(k); Pe_(k)^2; Pe_(k)^3; Pe_(k)^4];
end
ua2bb(:) = polyfit(ua__, b__, 4);
b = polyval(ua2bb(:), ua);
Qt(2) = Pe * b / (361.7 * roug);
Qs(j) = 1/2 * (Qt(2) + Qt(1)) * Det_t;
end
Q(4) = sum(Qs);
% 工况5
s = 250; % 行程
ua = 50; % 起始速度
b = polyval(ua2b(i, :), ua);
Ff = G * (f + 0 * ua);
Fw = CDA / 21.15 * ua.^2;
Pf_Pw = (1 / Eta_T) * (Ff * ua / 3600 + Fw * ua / 3600);
Pe = Pf_Pw;
Q(5) = Pe * b * s / (102 * ua * roug);
% 工况6
t = 19.3;
Qi = 0.299;
Q(6) = t*Qi;
out = sprintf("%s第%d档耗油量为%.2fL\n", out, i, sum(Q) * 100/1075);
end
disp(out);