Sreekanth R, Rangarajan S, Anand G -System Simulation

24 Pages·2017·3.88 MB·English

Passenger Car baseline Fuel Economy Validation with Test data on IDC & FE Improvement
Strategies Prediction to improve CAFE Ratings
Sreekanth R, Rangarajan S, Anand G
-System Simulation
PWT CAE| System Simulation GT-SUITE User Conference | Jan 15, 2018
Outcome of the Seminar
CONTENTS
1. Modelling & Validation of FE on Indian Driving Cycle in GT-SUITE.
2. Modelling FE improvement ideas using GT-SUITE as POC.
ECU control logic
Summary,
FE ideas
Conclusions
Component level FE
ideas
and
Future Scope
1. Stop-Start
1. Driveline
FE
optimization
Baseline validation
FE Challenges for on Indian Driving 2.Drag Coefficient 2. Power-Eco mode
Automotive Cycle(IDC) & LOW RRC Tires
Industry
| 2
Contents
Introduction
Baseline Fuel Economy validation on IDC
FE improvement ideas
Summary & Conclusions
Challenges & Future scope
| 3
1- INTRODUCTION
Background- FE Challenges
How to
balance
them..??
| 4
1- INTRODUCTION
Challenges and Motivation
Vehicle FE improvement concept freeze
• Vehicle performance evaluation
• Modeling using simulation tools in upstream development stages (Limited/no test data)
• Prototyping & final test
Challenges in Real World Testing Benefits with 1D GT-SUITE Simulation
• Prototype • No Prototype detailed
physics of
system to be
• Cost involved • Less Cost
modeled !!
• Less efforts
• Vehicle test
facility
• Good accuracy with
Repeatability
• Complexity
.
| 5
1- INTRODUCTION
1D GT-SUITE vehicle model
Physical Layout-Chassis Dyno Simulation Layout in GT-SUITE
Deliverables
FE Improvement
FE Validation
• Transmission Optimization
• Vehicle Modelling
• Drag Coefficient & Low RRC Tires
• FE Validation on IDC • Start-Stop
• Power-Eco Modes
| 6
1- INTRODUCTION
Simulation Steps
• Drive model: Speed target PID.
t Modeling & System Integration
n
e • Engine: Map based model with Engine
nle • Drive model
opve • Engine, ECU (Simple / Detailed BSFC map.
mL
o FRM), Fuel Cut off logic. • Transmission: 6 speed MT gear box & FDR.
C • Transmission, TCU Component
• Carbody
IDC (Indian Driving Cycle)
Driving Cycle • Vehicle speed & gear position target as time
m
profile.
ele
tsv • Fuel Economy simulation on System
ye
SL IDC Level
le • Drag coefficient and Tire rolling resistance
vtn target data.
eLe FE improvement
m
t • Component level improvement • Stop-Start logic and Power-Eco mode
ne
eovo • ECU logic improvement Control accelerator pedal map scaling.
pr Logic
mp
m
o
Ci
• FE validation of baseline
n
o
it Driving Cycle • Validation of Stop-Start and Power Eco
a
d • IDC mode POC with real world FE improvement
ilav • Real World Driving Cycle/ data from OEMs(Open claims/resources)
C Customer driving cycle Validation
O
P
| 7
2- Baseline FE validation on IDC
Baseline FE validation on IDC
IDC Cycle data:
Indian Driving Cycle(IDC Cycle)
100 6
)
h
p 80 5
m
K 4
(d 60 G
ee 3 ae
ps e 40 2 (r-)
lc
ih 20 1
e
V
0 0
0 200 400 600 800 1000 1200
Time(sec)
Vehicle Speed(Kmph) Gear(-)
Engine speed:
Engine speed_IDCCycle
3500
)
M
P
R
(
d
e
e
p
s
e
n
ig
n
E
0 200 400 600 800 1000 1200
Time(sec)
Baseline configuration
| 8
2- Baseline FE validation on IDC
Baseline FE validation on IDC
Baseline model Fuel Consumption-Simulation:
Baseline cumulative fuel consumption
700
)
s
m
a
r
g
(
n
o
itp Baseline
m
u
s
n
o
C
le
u
F
0 200 400 600 800 1000 1200
Time(sec)
Baseline FE Validation:
23
Test(Chassis Dyno) Simulation
)
lp
m
K
(
y
m
o
n
o
c
E -2.4%
le
u
F
15
| 9
3- FE improvement POC 1
Driveline optimization
Driveline optimization: Driveline inputs in GT-SUITE:
Engine speed comparison:
Engine speed comparison 20
3500
0
)
M
P
R
(
d
e
e
p
s
e
n
ig
n
E
0 200 400 600 800 1000 1200
30
Time(sec)
0 6000
Baseline configuration Optimized configuration
| 10