Answer to Question #305530 in MatLAB for Mr Z

Question

    Use the battery voltage and current data imported to calculate the battery power P as follows 

    P = UI where P is the battery power [W], U is the battery voltage [V] and I is the battery current 

    [A] battery voltage in V [Pack Volts]

    battery current in A [Pack Amps]  

 2. Plot each variable listed below against time in a form of subplot. 

    There should be 6 subplots in a single figure aligned in 2 columns and 3 rows. 

    Use different line colour for each data. Add labels to all axes.

    • time in seconds [Time]

    • speed in km/h [Speed]

    • gear [Gear]

    • elevation in meters [Elv]

    • SOC (state-of-charge) in % [SOC]

    • battery voltage in V [Pack Volts]

    • battery current in A [Pack Amps]

%}

On the same figure plot all four obtained powers in kW against time. Use different line styles for each power, e.g. solid line, dashed line, dotted line or dash-dot line. Add labels to all axes. Add title, legend and grid to the figure.

Answer 1

close all,
clear all,
clc,
%{
    Use the battery voltage and current data imported to calculate the battery power P as follows 
    P = UI where P is the battery power [W], U is the battery voltage [V] and I is the battery current 
    [A] battery voltage in V [Pack Volts]
    battery current in A [Pack Amps]  
 2. Plot each variable listed below against time in a form of subplot. 
    There should be 6 subplots in a single figure aligned in 2 columns and 3 rows. 
    Use different line colour for each data. Add labels to all axes.
    • time in seconds [Time]
    • speed in km/h [Speed]
    • gear [Gear]
    • elevation in meters [Elv]
    • SOC (state-of-charge) in % [SOC]
    • battery voltage in V [Pack Volts]
    • battery current in A [Pack Amps]
%}


%{
t = 0:1:100;    %Time Step
Load = 10;  % Ohms


P=[];       %power
Vel = [];   %Speed
Gear= [];   %Gear
SOC = [];   %Soc
V = [];     %Voltage
A = [];     %Current
for r=1:length(t)
    V(r)=100*rand;
    A(r) = V(r)/Load;
    P(r) = V(r) * A(r);
    Vel(r) = V(r)*rand();
    SOC(r) = Vel(r)*rand;
    Gear(r) = SOC(r)*rand();
end
scrsz = get(0,'ScreenSize');
Dim=0;
figure('Position',[scrsz(1)+Dim, scrsz(2)+Dim,scrsz(3)-20,scrsz(4)-100]);


subplot(3,2,1);
plot(t,V,'r');  grid on,    hold on,
xlabel('--- Time(t) --->');
ylabel('--- Voltage (V) --->');
title('Plot: Voltage','FontSize',20);


subplot(3,2,2);
plot(t,A,'g');  grid on,    hold on,
xlabel('--- Time(t) --->');
ylabel('--- Current(A) --->');
title('Plot: Current (A)','FontSize',20);


subplot(3,2,3);
plot(t,P,'b');  grid on,    hold on,
xlabel('--- Time(t) --->');
ylabel('--- Power --->');
title('Plot: Power','FontSize',20);


subplot(3,2,4);
plot(t,Vel,'k');  grid on,    hold on,
xlabel('--- Time(t) --->');
ylabel('--- Speed --->');
title('Plot: Speed','FontSize',20);


subplot(3,2,5);
plot(t,SOC,'m');  grid on,    hold on,
xlabel('--- Time(t) --->');
ylabel('--- SOC --->');
title('Plot: SOC','FontSize',20);


subplot(3,2,6);
plot(t,Gear,'c');  grid on,    hold on,
xlabel('--- Time(t) --->');
ylabel('--- Gear --->');
title('Plot: Gear','FontSize',20);