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