汽油与CNG发动机的万有特性曲线

大雨沃鹏

%不同转速下的燃油消耗率与扭矩的曲线拟合
clear all
be1=[222.8,220.4,232.4,228.5,227.8,232.6,248.5,245.9,272.4,329.7];
Ttq1=[399.8,354.1,318.5,278.1,236.2,203.6,185.3,157.2,117.2,80.8];
T1=80:320/9:400;%转换矩阵格式
Be1=interp1(Ttq1,be1,T1,'spline');%n=1400r/min时燃油消耗率与扭矩的曲线拟合

be2=[222.0,221.7,235.4,226.5,230.5,236.8,249.1,276.1,407.9,487.0];
Ttq2=[409.1,365.7,328.3,284.1,243.7,203.2,164.3,123.9,83.5,39.7];
T2=39:371/9:410;
Be2=interp1(Ttq2,be2,T2,'spline');

be3=[226.0,225.3,226.4,233.9,242.1,283.3,253.9,271.4,323.5,468.6];
Ttq3=[408.3,368.3,328.3,289.0,244.4,208.8,167.7,132.1,89.5,46.1];
T3=46:363/9:409;
Be3=interp1(Ttq3,be3,T3,'spline');

be4=[206.5,231.1,231.1,233.0,242.0,244.9,265.0,299.8,398.0,596.8];
Ttq4=[425.6,380.3,332.7,290.9,244.4,205.1,160.2,114.5,68.8,30.7];
T4=30:396/9:426;
Be4=interp1(Ttq4,be4,T4,'spline');

be5=[234.7,259.8,235.5,237.6,242.8,292.3,277.9,308.7,396.2,605.9];
Ttq5=[420.7,379.6,334.6,291.6,244.4,202.8,157.5,116.0,74.1,37.8];
T5=37:384/9:421;
Be5=interp1(Ttq5,be5,T5,'spline');

be6=[174.2,242.2,252.1,287.4,253.6,263.6,290.6,316.8,378.0,518.8];
Ttq6=[404.6,360.5,322.7,283.0,243.3,205.5,162.1,124.7,86.8,52.4];
T6=52:353/9:405;
Be6=interp1(Ttq6,be6,T6,'spline');

be7=[256.9,253.7,253.5,260.0,303.8,280.7,300.6,346.6,435.6,812.9];
Ttq7=[378.0,344.7,310.3,264.3,226.1,186.8,154.2,115.3,76.3,34.1];
T7=34:344/9:378;
Be7=interp1(Ttq7,be7,T7,'spline');

be8=[257.9,295.3,282.4,288.7,301.9,329.7,357.0,475.4,580.3,1080.1];
Ttq8=[315.6,275.5,242.5,210.3,178.5,145.6,118.6,72.6,52.8,22.4];
T8=22:294/9:316;
Be8=interp1(Ttq8,be8,T8,'spline');

B=[Be1';Be2';Be3';Be4';Be5';Be6';Be7';Be8'];
N=[1400*ones(10,1);1600*ones(10,1);1800*ones(10,1);2000*ones(10,1);2200*ones(10,1);2400*ones(10,1);2600*ones(10,1);2800*ones(10,1)];
Ttqn=[T1';T2';T3';T4';T5';T6';T7';T8'];
G=[ones(80,1),N,Ttqn,N.^2,N.*Ttqn,Ttqn.^2];
A=G\B;%A为6*1矩阵
[n,Ttq]=meshgrid(1400:2800,100:600);%生成n-Ttq平面上的自变量“格点”矩阵
be=A(1)+n.*A(2)++Ttq*A(3)+n.^2*A(4)+n.*Ttq*A(5)+Ttq.^2*A(6);
Pe=Ttq.*n/9550;

%外特性实验数据拟合
Nw=[1403,1597,1797,1986,2102,2199,2303,2400,2507,2598,2700,2802];
Ttqw=[474,497,515,526,528.8,522.8,509.5,492.2,471.2,448.4,408.3,357.4];
n0=1400:2800;
Ttqw_N=interp1(Nw,Ttqw,n0,'spline');
h=repmat(Ttqw_N,501,1);
ii=find(Ttq>h);%确定超出边界的“格点”下标
be(ii)=NaN;%强制为非数
Pe(ii)=NaN;%强制为非数

%绘制边界线(外特性曲线)
plot(n0,Ttqw_N,'LineWidth',2);
axis([1400,2800,100,550]);
xlabel('n(r/min)');
ylabel('Ttq(N*m)');
title('汽油发动机万有特性曲线');
hold on;

%绘制等油耗率曲线的二维图
B=contour(n,Ttq,be,11);%画等位线，并给出标识数据
clabel(B);%把“等位值”沿等位线随机标识
hold on;

%绘制等功率曲线的二维图
P=contour(n,Ttq,Pe,11);%画等位线，并给出标识数据
clabel(P);%把“等位值”沿等位线随机标识
legend('等油耗曲线','等功率曲线',)
hold off
上面是汽油发动机的万有特性曲线，我想在此基础上改写成天然气发动机的万有特性曲线，我知道在中小负荷天然气发动机的等燃油消耗率曲线的区域要比汽油的偏大，扭矩相差不是很大，在大负荷下，二者经济性相差不多，但是动力性差很多。我不知道该怎么改汽油万有特性的数据？拜谢啊

ccav

先收下了，谢谢

Archer@吉尔伽美

谢谢，学习一下