Not able to reproduce the results from the respective Simulink model attached below.

clc

%Vehicle parameters

Mv = 1420; % vehicle curb weight in kg

Cd = 0.3; % drag coeffecient

Af = 2.38; % frontal area in m^2

rho = 1.2; % air density in kg/m^3

g = 9.81; % gravity constant in m/s^2

%Motor parameters

Pm_max = 125; % Max motor power in kW

Tm_max = 250; % Max motor torque in Nm

Pm_regen = 55; % Max regen brake power in kW

eta_m = 0.95; % assumed motor efficiency

eta_inv = 0.97; % assumed inverter efficiency

aux_power = 300; % auxiliary power

%Transmission parameters

ig = 9.7; % gear ratio

r_dyn = 0.3638; % tyre radius in m

eta_t = 0.97; % transmission efficiency

%Battery parameters

V_cell = 3.7; % nominal cell voltage in volts

V_pack = 355.2; % battery pack voltage in volts

C_cell = 60; % cell capacity in Ah

C_pack = 60; % battery pack capacity in Ah

E_pack = 22; % battery pack energy in kWh

R0 = 0.1; % internal resistance of cell in ohms

N = 96; % total number of cells

%Braking Strategy

psi = 0.8; % tyre adhesion coefficient

Xb_max = psi*Mv*g; % Max available braking force

%PI-Controller parameters

Kp = 60; % proportional constant of P-I controller

Ki = 2; % integral constant of P-I controller

• Above is the script used for the simulink model which is built on basis of a reference paper.
• The model as well as the referene paper is attached.
• Not able to match the vehicle velocity with the reference drive cycle velocity. Also, not able to get the desired battery pack energy results.

Doubts that I think of problems I have would be regarding following subsystems used:

• Driver model
• Brake controller
• Vehicle model

Answer 1

[Prasanth B]

Hi Sameer, The error is pertaining to the driver controller model.

Refer Fig 4A in your attachement (case study paper). the driver model should be modified to have delta-V (ref speed - actual speed) and based on delta-V sign, acc command or brake command has to be generated. I see this portion is missing in your model.

In your existing/ attached model, observe that the actual speed is following ref speed in acceleration phase and it is failing during deceleration phase. Hope this helps.