US2008275614A1PendingUtilityA1
Method for determining the clutch application point
Assignee: ZAHNRADFABRIK FRIEDRICHSHAFENPriority: Dec 21, 2001Filed: Jul 18, 2008Published: Nov 6, 2008
Est. expiryDec 21, 2021(expired)· nominal 20-yr term from priority
Inventors:Andreas SchwengerOtto EbnerKlaus SchweigerMatthias WinkelChristoph RüchardtMarcus GansohrThomas Knoblauch
F16D 48/06F16D 2500/70404F16D 25/14F16D 25/12F16D 2500/7109F16D 2500/3024F16D 2500/10412F16D 2500/50245
52
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Claims
Abstract
A method is proposed for determining a clutch application point in a transmission of a vehicle having a spring-actuated clutch system in which the clutch application point is adapted according to at least one adequate regulated quantity of the clutch system.
Claims
exact text as granted — not AI-modified1 . Method for determining a clutch application point in a transmission of a vehicle having one spring-actuated clutch system, characterized in that the clutch application point ( 5 ) is adapted according to at least one adequate regulated quantity of the clutch system.
2 . Method according to claim 1 , characterized in that the disengagement load is varied as regulated quantity change.
3 . Method according to claim 2 , characterized in that as clutch application point ( 5 ) a common point of intersection of the curve of the disengagement load and the spring tension is determined via the disengagement path of the clutch system.
4 . Method according to any one of claims 2 or 3 , characterized in that at least one gradient curve of the disengagement load abutting on the clutch system is determined via the disengagement path and that a jog in the gradient curve of the disengagement load is found which determines the clutch application point ( 5 ).
5 . Method according to claim 4 , characterized in that several adequate regulated quantities are measured so that at least sections of a gradient curve of the disengagement load are determined before and/or after the jog.
6 . Method according to any one of claims 1 to 5 , characterized in that in a mechanically actuated disengagement system the contact force is determined when the clutch is closed by the following equation:
F Amp ( S )= F AmpAP −i Lever F Disengagement ( S ) with
F Amp (S)=contact force
F AmpAP =contact force on working point
i Lever =force reinforcement factor
F Disengagement (S)=disengagement load
7 . Method according to claim 6 , characterized in that the disengagement load substantially linearly depends on the disengagement path and is determined by the following equation:
F Disengagement ( S )= c Diaphragm spring *S Disengagement with
F Disengagement (S)=disengagement load
c Diaphragm spring =spring constant
S Disengagement =disengagement path
8 . Method according to any one of claims 6 or 7 , characterized in that the clutch application point ( 5 ) is determined when the contact force substantially assumes the value zero.
9 . Method according to any one of claims 6 to 8 , characterized in that in the mechanically actuated disengagement system the following equations result:
s
F
Disengagement
(
S
)
=
c
Diaphragm
spring
for
S
〈
S
Application
s
F
Disengagement
(
S
)
=
s
F
Plate
spring
(
S
Plate
)
/
i
Lever
for
S
〉
S
Application
point
there applying
F Disengagement ( S )= F Plate spring ( S Plate )/ i Lever
with
s
F
Disengagement
(
S
)
=
derivation
of
the
disengagement
load
(
gradient
)
F
Plate
spring
(
S
Plate
)
=
plate
spring
force
S
Application
point
=
disengagement
path
corresponds
to
clutch
application
point
i
Lever
=
force
reinforcement
factor
c
Diaphragm
spring
=
spring
constant
10 . Method according to any one of claims 1 to 9 , characterized in that when an actuator is used for control of the disengagement system, by evaluating at least one regulated quantity, a jog is determined in the gradient curve of the disengagement load.
11 . Method according to any one of claims 1 to 10 , characterized in that at least one time valve is used in the hydraulic actuation of the disengagement system.
12 . Method according to claim 11 , characterized in that when the clutch is closed one time valve or when the clutch is open one clutch closing valve with constant or defined pulse width is controlled and that the clutch application point ( 5 ) is determined by evaluating the detected disengagement path.
13 . Method according to any one of claims 1 to 12 , characterized in that when an electric system is used for control of the disengagement system, the clutch application point ( 5 ) is determined from the measurements of path, voltage and/or current.
14 . Method according to any one of claims 1 to 12 , characterized in that when an electropneumatic system is used for control of the disengagement system, the clutch application point ( 5 ) is determined from the measurements of path and pressure.Join the waitlist — get patent alerts
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