Clutch control method for vehicle

Patent metadata

Field	Value
Publication number	US-10138957-B2
Application number	US-201715644096-A
Country	US
Kind code	B2
Filing date	Jul 7, 2017
Priority date	Dec 15, 2016
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A clutch control method for a vehicle includes steps of: calculating, by a controller, an estimated clutch torque by substituting a plurality of parameters, and a sensed stroke of a clutch actuator into a predetermined characteristic function; updating, by the controller, the parameters as new values by a prediction error method using a torque error, which is a difference between a reference clutch torque and the estimated clutch torque; calculating a desired stroke by substituting a desired clutch torque and the updated parameters into a predetermined characteristic inverse function; and driving the clutch actuator based on the calculated desired stroke to control the clutch by the controller. The plurality parameters represent physical properties of a clutch, and the predetermined characteristic function represents characteristics of a clutch transmission torque to a clutch actuator stroke. In addition, the predetermined characteristic inverse function represents a clutch actuator stroke to a clutch transmission torque.

First claim

What is claimed is:

1. A clutch control method for a vehicle, comprising steps of:
calculating an estimated clutch torque by substituting a plurality of parameters, which represent physical properties of a clutch, and a sensed stroke of a clutch actuator into a predetermined characteristic function, which represents characteristics of a clutch transmission torque to a clutch actuator stroke, by a controller;
updating the plurality of parameters as new values by a prediction error method based on a torque error, which is a difference between a reference clutch torque referring to a current transmission torque of the clutch and the estimated clutch torque calculated in the step of calculating the estimated clutch torque, by the controller;
calculating a desired stroke by substituting a desired clutch torque and the updated parameters into a predetermined characteristic inverse function, which represents a clutch actuator stroke to a clutch transmission torque, by the controller; and
driving the clutch actuator based on the calculated desired stroke to control the clutch by the controller.

2. The clutch control method according to claim 1 , wherein the plurality of parameters comprise a touch point, a cushion spring constant, a diaphragm spring constant, a clutch actuator stroke at which a diaphragm spring begins to be deformed, and a rate of change of a value, which is obtained by adding the cushion spring constant and the diaphragm spring constant, based on a change of the clutch actuator stroke.

3. The clutch control method according to claim 2 , wherein the characteristic function is calculated as:
{circumflex over (T)} cl ( {hacek over (u)} )=1/2{tan h (10( {hacek over (u)}−p 0 ))+|tan h (10( {hacek over (u)}−p 0 ))|} p 1 ( {hacek over (u)}−p 0 )+1/2{tan h ( p 4 ( {hacek over (u)}−p 0 −p 3 ))+|tan h ( p 4 ( {hacek over (u)}−p 0 −p 3 ))|} p 2 ( {hacek over (u)}−p 0 −p 3 ),
where:
{circumflex over (T)} cl is an estimated clutch torque,
{hacek over (u)} is sensed clutch actuator stroke,
p 0 is a clutch touch point,
p 1 is a cushion spring constant,
p 2 is a diaphragm spring constant,
p 3 is a clutch actuator stroke at which a diaphragm spring begins to be deformed, and
p 4 is a rate of change of a value, which is obtained by adding the cushion spring constant and the diaphragm spring constant, based on a change of the clutch actuator stroke.

4. The clutch control method according to claim 3 , wherein the characteristic inverse function is calculated as:

u
~

⁡

(

T
~

cl

)

=

p
0

+

1

p
1

⁢

T
~

cl

-

p
2

⁢

α
*

(

T
~

cl

-

p
1

⁢

p
3

)

+
β

(

T
~

cl

-

p
1

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p
3

)

+
γ

p
1

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(

p
1

+

p
2

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-

p
1

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p
3

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Iucf Hyu
• Iucf Hyu Industry Univ Cooperation Foundation Hanyang

Inventors

• Kim Jin Sung
• Lee Ho Young
• Park Jahng Hyon
• Ko Young Ho

Classifications

• F16D2500/30401

  On-off signal indicating the engage or disengaged position of the clutch · CPC title

• F16D2500/50236

  Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement · CPC title

• F16D2500/30421

  Torque of the output shaft · CPC title

• F16D2500/30425

  Estimation of the transmitted clutch torque, e.g. applying dynamic torque balance equation · CPC title

• F16D2500/70426

  Clutch slip · CPC title