Improving Ride Comfort Using Control Systems Design for Active Damper
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Typ
Examensarbete för masterexamen
Program
Systems, control and mechatronics (MPSYS), MSc
Publicerad
2019
Författare
Goudarzi, Elham
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
There is a great demand for improvements in ride comfort of high-end passenger cars.
Heave, roll and pitch motions might negatively affect ride comfort. In this regard,
active and passive components are often integrated to improve vehicle dynamics
performance. One of the challenges for automotive industry is to design controllers
for active components used in the suspension system. The main focus here is to
replace front and rear passive dampers with a set of active dampers integrated in
parallel with coil springs within the suspension system. Such a setup can improve the
overall performance of the vehicle by inducing or dispersing energy. Furthermore,
it can reduce weight and energy consumption. However, such an active system
might bring extra oscillation and disturbances to the vehicle. Hence, the integrated
active dampers should be well controlled in order to operate as expected. The
main objective of this study is to design a suitable control algorithm for the active
dampers. A full vehicle model with 7 degrees of freedom (DOF) is validated in
IPG CarMaker and used for the control design. Three different controllers are
designed in Matlab: sky-hook controller, optimal controller with LQR method and
robust controller with H1 method. The challenging part is tuning the parameters
and weight selections for controllers. The controllers performances are verified and
tested in IPG CarMaker and compared to the performance of a conventional passive
suspension system. An overall improvement of the ride comfort is achieved in the
simulations. It is recommended that the solutions are further assessed and developed
in production vehicles and/or balancing with other performance indicators than
comfort, such as handling and longitudinal performance.
Beskrivning
Ämne/nyckelord
Active suspension , ride comfort evaluation , robust control , optimal control , active damper , vehicle dynamics