PfefferMXsteering - mdynamix.de · Models and characterizes hydraulic and electromechanical ......
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06.06.2016 MdynamiX AG Pfeffer MXsteering Pfeffer MXsteering
Transcript of PfefferMXsteering - mdynamix.de · Models and characterizes hydraulic and electromechanical ......
06.06.2016 MdynamiX AG
Pfeffer MXsteering
Pfeffer MXsteering
06.06.2016 MdynamiX AG2
Pfeffer MXsteering
Models and characterizes hydraulic and electromechanical steering systems such as Column, Pinion or Rack-type. The 3 DOF model is real-time capable and provides high- and low-frequency behavior with different friction, stiffness and damping parameters down to component level. Also user defined ECUs models can be easily implemented. It is suitable for the simulation and analysis of NVH, steering feel and handling.
The model is already implemented in IPG CarMaker and VI-CarRealTime. It can be used also in Simulink or in conjunction with other tools.
Pfeffer MXsteering model computes the steering wheel torque very precisely!This is essential for steering feel development and optimizations.
06.06.2016 MdynamiX AG3
Introduction of the Pfeffer MXsteering Models
δH
JuC
MF,lc
FR
MH
Symbol of a friction element
Massist,C
kT
dT
SR
Hardy disc, Mesh, Lower Column
Steering Wheel
mR Rack
Pinion
δP
rpi
FF, R
MF,torsion δT
kTT
dTT
JlC
Torsion bar, Upper Column
Pfeffer MXsteering
06.06.2016 MdynamiX AG4
Introduction of the Pfeffer MXsteering Models
Types of steering systems:• Hydraulic Power Steering Systems (HPS)• Electrical Power Steering Systems (EPS)
o Column Assist o Pinion Assisto Rack Assist
Provides different complexity depends on the users’ need
06.06.2016 MdynamiX AG5
The Structure of the Pfeffer MXsteering Models
Mechanical Module:
Three degree of freedom:Upper Column, Lower Column and Rack.
Column is modelled as two sets of Spring-damper linked with cardan joint.
Frictions are applied to the lowercolumn and rack with advancedfriction models.
06.06.2016 MdynamiX AG6
The Structure of the Pfeffer MXsteering Models
EPS - Column Assist:
Typically power assist unit is a compact component installed at the upper column including the torsion bar.
Therefore the assist torque is applied directly at the upper column. The torsion bar friction is considered.
06.06.2016 MdynamiX AG7
The Structure of the Pfeffer MXsteering Models
EPS – Pinion Assist:
Typically power assist unit is a compact component installed above the pinion including the torsion bar.
Therefore the assist torque is applied directly at the lower column. The torsion bar friction is considered.
06.06.2016 MdynamiX AG8
The Structure of the Pfeffer MXsteering Models
EPS – Rack Assist:
Typically power assist unit is a compact component installed at the rack and torsion bar is installed above the pinion.
Therefore the assist force is applied directly at the rack. The torsion bar friction is also considered.
06.06.2016 MdynamiX AG9
The Performance of the Pfeffer MXsteering
0 2 4 6 8 10-5
-4
-3
-2
-1
0
1
2
3
4
5
Time [s]
Stee
ring
Whe
el T
orqu
e [N
m]
Weave Test, 80 km/h, 0.2 Hz
SimulationTest Bench Measurement
0 5 10 15 20-40
-30
-20
-10
0
10
20
30
Time [s]
Ste
erin
g W
heel
Tor
que
[Nm
]
Sinus Sweep, 80 km/h
SimulationVehicle Measurement
Pfeffer MXsteeringsuccessfully transforms the steering feel in reality to the
virtual world
30.03.2016 MdynamiX AG10
The Parametrisation of Pfeffer MXsteering Model
MXsteeringdesigner
0 10 20 30 40 50 60 70 80-10
-5
0
5
10
15
Time [s]
Ste
ering W
heel T
orq
ue [
Nm
]
0 10 20 30 40 50 60 70 80-200
-150
-100
-50
0
50
100
Time [s]
Ste
ering W
heel A
ngle
[deg]
0 10 20 30 40 50 60 70 800
20
40
60
80
100
120
Time [s]
Vehic
le S
peed [
km
/h]
0 10 20 30 40 50 60 70 80-8000
-6000
-4000
-2000
0
2000
4000
6000
Time [s]
Tie
Rod F
orc
e [
N]
Simulation
Measurement
δH
JuC
MF,lc
FR
MH
Symbol of a friction element
Massist,C
kT
dT
SR
Hardy disc, Mesh, Lower Column
Steering Wheel
mR Rack
Pinion
δP
rpi
FF, R
MF,torsion δT
kTT
dTT
JlC
Torsion bar, Upper Column
PfefferMXsteering Models
Vehicle / Test Bench Measurement
Parametrisation tool for Pfeffer MXsteering modelsIdentifies steering model parameter automatically from measurements
Benchmark/design your own steering system
06.06.2016 MdynamiX AG
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www.mdynamix.de
Contact us
MdynamiX – An Institute of Munich University of Applied Sciences
