Post on 30-Mar-2015
Modern chassis diagnosisissued on occasion of "automechanika 2004" - Frankfurt/Main
Transverse force
Tangential force
KAMM - friction circle
Suspension
testing
© 2004 all Copyrightsby SAXON Prüftechnik GmbH
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
What ? How ? Why ?
ES
mp
Considering
Considering
all components
all components
involved
involved
Involved Importance
M 25%m
Ca 35%
Cs 10 %
Cr 5 %
Km 15 %
Kr 10 %
Need of
Need of
vehicle - independent
vehicle - independent
evaluation
evaluation
The trend for a complex chassis diagnosis with SAXON:
• Accurate, repeatable examination • Proofen by scientific facts • Future-proof developement • Internationally recognition
© 2004 all Copyrightsby SAXON Prüftechnik GmbH
Transverse force
Tangential force
KAMM - friction circle
Security of t
he
Security of t
he
forc
e transmission fo
r
forc
e transmission fo
r
steering and bra
king
steering and bra
king
on the ro
ad
on the ro
ad
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
Tasks and Goals
Dynamic Dynamic Stability for Stability for the whole the whole
vehiclevehicle
Static Brake force „B“ (N, kgf)
Roller brake tester
remaining Dynamicwheel load „A“ (%) Suspension tester
Separate, individual examinations
*
=
Usable, dynamic transmission forces for
steering and braking
Complex diagnosis
*Σ1
4
~
© 2004 all Copyrightsby SAXON Prüftechnik GmbH
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
Xo
Xo
X
ES
mp
ωM
ωm
M
m
EUSAMA* - Methode
M - Chassis mass (damped mass)
m – wheel suspension mass (undamped mass)
Km – Spring
wheel suspension mass
Ca – Damping shock absorber
Cs – Damping
wheel suspension mass
Kr – Spring Tyre
Cr – Damping Tyre
mp – Mass measuring plate
S - Force sensor
E - Eccentric with swing mass
All values of interest:
3) ωM and ωm = Process and Resonance frequency M, m
4) S = Wheel load and process, Wheel load fluctuation between 25 Hz down to 0 Hz
1) Minimum and process of dynamic road holding force „A“
5) Interferences of m(f)
(mathematically)
All Components:
M2) = Mass relation value m
Accord. EUSAMA recommendation TS-02-76, Weight fluctuation between 0 ... 25 Hz, Exciter amplitute with 6 mm
© 2004 all Copyrightsby SAXON Prüftechnik GmbH
* EUSAMA - European Shock Absober Manufacturer
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
Chassis diagnosis
3) ωM and ωm = Process and Resonance frequency M, m
4) S = Wheel load and process, Wheel load fluctuation between 25 Hz down to 0 Hz
1) Minimum and process of dynamic road holding force „A“
5) Interferences of m(f)
(mathematically)
M2) = Mass relation value m
Dynamic reduction of the Road holding force „A“
Ordi-nate
Recognition of the vehicle category and its standard tuning
Spring-Damping-Function
Spring ratefor wheel suspension / tyre
Irregularities of the oscillations amplitute "m"
Abscissa
ωmωM
Km Kr
ωB
B
© 2004 all Copyrightsby SAXON Prüftechnik GmbH
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
Graphical EvaluationsSuspensio
nSidslip Brakes
Dynamic and static Wheel load front axle
Dynamic and static Wheel load rear axle
Wear analysis for chassis system whole vehicle
Static Brake force,Imbalance, Ovality,
left and rightService brake
front axle
Static Brake force,Imbalance, Ovality,
left and rightService brake
rear axle
Static Brake force,Imbalance, Ovality,
left and rightparking brake
Wear analysis for all brake systemswhole vehicle © 2004 all Copyrights
by SAXON Prüftechnik GmbH
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
Wear - ExamplesExample 1
Spring rate o.k., both shock absorbers (front) requiring urgent replacment Diagonal conflict!
Good dynamic values, limit value excess by loose suspensions Dangerous !
Nearly new
Slightly wrong
Heavyly wrong
inoperativeM/m
„A“
VL Wheel suspension front / leftVR Wheel suspension front / right
HL Wheel suspension rear / left
HR Wheel suspension rear / right
Right side of vehicle
Left side of vehicle
Generally recognised limit values for vehicles of different classes in accordance with the mass
relationship
Vehicle evaluationTabular after classes Graphically using a matrix
Example 2
© 2004 all Copyrightsby SAXON Prüftechnik GmbH
Modern chassis diagnosis issued on occasion of "automechanika 2004" - Frankfurt/Main
Products availible
Cover plates are accuratly positioned over installation frame to maintain a good finish, all parts are galvanized
Availible in both versions, analogue display for all tests, PC -Terminale for analysis and data recording
Test equipment designed for quick installation and easyly handable maintenance and service,can also be used as split beds for a pit installation
A set of installation frames are always include for easy, cost efficient and accurate foundation set-up
Suspension Tester FW 67 / 70Vehicle Test Lane FPS 2000 / 2600
forVehicle class IV < 3,5 to.Vehicle class VII < 7,5 to.
© 2004 all Copyrightsby SAXON Prüftechnik GmbH