Hybrid electric vehicles (HEV) offer improved fuel efficiency compared to their conventional counterparts at the expense of adding complexity and at times, reduced total power. As a result, HEV generally lack the dynamic performance that customers enjoy. To address this issue, the paper presents a HEV with electric all-wheel drive (eAWD) capabilities via the use of a torque vectoring electric rear axle drive (TVeRAD) unit to power the rear axle. The addition of TVeRAD to a front wheel drive HEV improves the total power output. To further improve the handling characteristics of the vehicle, the TVeRAD unit allows for wheel torque vectoring (TV) at the rear axle. A bond graph model of the proposed drivetrain model is developed and used in cosimulation with carsim. The paper proposes a control system, which utilizes slip ratio optimization to allocate control to each tire. The optimization algorithm is used to obtain optimal slip ratio targets to at each tire such that the targets avoid tire saturation. The Youla parameterization technique is used to develop robust tracking controllers for each axle. The proposed control system is ultimately tested on the drivetrain model with a high fidelity carsim vehicle model for validation. Simulation results show that the control system is able to maximize vehicle longitudinal performance while avoiding tire saturation on a low μ surface. More importantly, the control system is able to track the desired yaw moment request on a high-speed double-lane change (DLC) maneuver through the use of the TVeRAD to improve the handling characteristic of the vehicle.

References

References
1.
Dextreit
,
C.
,
Assadian
,
F.
,
Kolmanovsky
,
I.
,
Mahtani
,
J.
, and
Burnham
,
K.
,
2008
, “
Hybrid Electric Vehicle Energy Management Using Game Theory
,”
SAE
Paper No. 2008-01-1317.
2.
Hancock
,
M.
, and
Assadian
,
F.
,
2006
, “
Impact of Regenerative Braking on Vehicle Stability
,”
The Institution of Engineering and Technology Hybrid Vehicle Conference
, Coventry, UK, Dec. 12–13, pp.
173
184
.
3.
Velazquez Alcantar
,
J.
, and
Assadian
,
F.
,
2016
, “
A Robust Stability Control System for a Hybrid Electric Vehicle Equipped With Electric Rear Axle Drive
,”
SAE Int. J. Passenger Cars-Mech. Syst.
,
9
(
2
), pp. 924–934.
4.
Velazquez Alcantar
,
J.
,
Assadian
,
F.
,
Kuang
,
M.
, and
Tseng
,
E.
,
2016
, “
Optimal Longitudinal Slip Ratio Allocation and Control of a Hybrid Electric Vehicle With eAWD Capabilities
,”
ASME
Paper No. DSCC2016-9629.
5.
Karnopp
,
D. C.
,
Margolis
,
D. L.
, and
Rosenberg
,
R. C.
,
2012
,
System Dynamics: Modeling, Simulation, and Control of Mechatronic Systems
,
Wiley
, Hoboken, NJ.
6.
Mechanical Simulation Corporation
, 2018, “
Carsim
,” Mechanical Simulation Corporation, Ann Arbor, MI.
7.
Hrovat
,
D.
, and
Tobler
,
W.
,
1991
, “
Bond Graph Modeling of Automotive Power Trains
,”
J. Franklin Inst.
,
328
(
5–6
), pp.
623
662
.
8.
Ivanović
,
V.
,
Herold
,
Z.
,
Deur
,
J.
,
Hancock
,
M.
, and
Assadian
,
F.
,
2009
, “
Experimental Characterization of Wet Clutch Friction Behaviors Including Thermal Dynamics
,”
SAE Int. J. Engines
,
2
(
1
), pp.
1211
1220
.
9.
Borrelli
,
F.
,
Bemporad
,
A.
, and
Morari
,
M.
,
2014
,
Predictive Control for Linear and Hybrid Systems
, Cambridge University Press, New York.
10.
Pacejka
,
H. B.
, and
Bakker
,
E.
,
1992
, “
The Magic Formula Tyre Model
,”
Veh. Syst. Dyn.
,
21
(
Suppl. 1
), pp.
1
18
.
11.
Ozkan
,
B.
,
Margolis
,
D.
, and
Pengov
,
M.
,
2008
, “
The Controller Output Observer: Estimation of Vehicle Tire Cornering and Normal Forces
,”
ASME J. Dyn. Syst., Meas., Control
,
130
(
6
), p.
061002
.
12.
Varnhagen
,
S.
, and
Margolis
,
D.
,
2014
, “
Longitudinal Slip Ratio Control of Electric Powertrains Using a Controller Output Observer for Disturbance Rejection
,”
SAE Int. J. Passenger Cars-Mech. Syst.
,
7
(
1
), pp.
65
72
.
13.
Velazquez Alcantar
,
J.
, and
Assadian
,
F.
,
2018
, “
Longitudinal Tire Force Estimation Using Youla Controller Output Observer
,”
IEEE Control Syst. Lett.
,
2
(
1
), pp.
31
36
.
14.
Assadian
,
F.
,
2015
,
Theory and Design of Control Systems
(Lecture Notes, MAE 272), Purdue University, West Lafayette, IN.
15.
ISO
, 1999, “
Passenger Cars–Test Track a Severe Lane-Change Manoeuver—Part 1: Double Lane-Change
,” International Organization for Standardization, Geneva, Switzerland, Standard No.
SS-ISO 3888-1
.
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