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

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SAMEERSRIVATSA B R
编辑： Prasanth B 2022-6-3
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

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回答（1 个）

Prasanth B
Prasanth B 2022-6-3
编辑：Prasanth B 2022-6-3
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.

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