Clutch torque estimating method for vehicle transmission

Patent metadata

Field	Value
Publication number	US-10830294-B2
Application number	US-201916533062-A
Country	US
Kind code	B2
Filing date	Aug 6, 2019
Priority date	Mar 25, 2019
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A clutch torque estimating method for a transmission of a vehicle may include inputting model engine torque to a powertrain model by a controller; inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller; inputting shifting information related to the vehicle to the powertrain model by the controller; correcting the powertrain model in real time by feeding back an engine angular velocity error, a clutch angular velocity error of the first clutch, a clutch angular velocity error of the second clutch, a wheel angular velocity error to the powertrain model by the controller; and estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller.

First claim

What is claimed is:

1. A clutch torque estimating method for a transmission of a vehicle, the clutch torque estimating method comprising:
inputting model engine torque to a powertrain model by a controller;
inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller;
inputting shifting information related to the vehicle to the powertrain model by the controller;
correcting the powertrain model in real time by feeding back an engine angular velocity error which is a difference between a measured engine angular velocity and an estimated engine angular velocity determined from the powertrain model, a clutch angular velocity error of the first clutch which is a difference between a measured clutch angular velocity of the first clutch and an estimated clutch angular velocity of the first clutch determined from the powertrain model, a clutch angular velocity error of the second clutch which is a difference between a measured clutch angular velocity of the second clutch and an estimated clutch angular velocity of the second clutch determined from the powertrain model, and a wheel angular velocity error which is a difference between a measured wheel angular velocity and an estimated wheel angular velocity determined from the powertrain model, to the powertrain model by the controller;
estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller; and
controlling the first clutch and the second clutch using the estimated clutch torque of the first clutch and the estimated clutch torque of the second clutch by the controller.

2. The clutch torque estimating method of claim 1 , wherein the powertrain model includes:
an engine model determined according to engine dynamics;
a first clutch model and a second clutch model determined according to clutch dynamics; and
a vehicle model determined according to vehicle dynamics.

3. The clutch torque estimating method of claim 2 , wherein the model engine torque is configured to be input to the powertrain model with an estimated engine torque error determined by cumulative-integrating the engine angular velocity error.

4. The clutch torque estimating method of claim 3 ,
wherein the target clutch torque of the first clutch is multiplied by a clutch characteristic variable of the first clutch determined by a clutch friction force characteristic model of the first clutch and is then input to the powertrain model, and
wherein the target clutch torque of the second clutch is multiplied by a clutch characteristic variable of the second clutch determined by a clutch friction force characteristic model of the second clutch and is then input to the powertrain model.

5. The clutch torque estimating method of claim 4 , wherein the engine model is
J e {circumflex over ({dot over (ω)})} e =T e0 +{circumflex over (δ)} e −{circumflex over (μ)} c1 T tc1 −{circumflex over (μ)} c2 T tc2 , where

J e : Engine moment of inertia
{circumflex over ({dot over (ω)})} e : Estimated engine angular acceleration
T e0 : Model engine torque
{circumflex over (δ)} e : Estimated engine torque error
{circumflex over (μ)} c1 : Clutch characteristic variable of first clutch
T tc1 : Target clutch torque of first clutch
{circumflex over (μ)} c1 T tc1 : Clutch torque of first clutch
{circumflex over (μ)} c2 : Clutch characteristic variable of second clutch
T tc2 : Target clutch torque of second clutch
{circumflex over (μ)} c2 T tc2 : Clutch torque of second clutch.

6. The clutch torque estimating method of claim 4 , wherein the first clutch model is

J

c
⁢

⁢
1

′

⁢

ω

^
·

c
⁢

⁢
1

=

μ
^

c
⁢

⁢
1

⁢

T

tc
⁢

⁢
1

+

γ
T

⁡

(

φ
e

)

γ
T

⁡

(

φ
o

)

⁢

μ
^

c
⁢

⁢
2

⁢

T

tc
⁢

⁢
2

-

T
so

⁡

(

ω
^

c
⁢

⁢
1

,

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Jin Sung

Classifications

• F16D48/06

  Control by electric or electronic means, e.g. of fluid pressure · CPC title

• F16H59/56

  dependent on signals from the main clutch · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• F16H61/688 Primary

  with two inputs, e.g. selection of one of two torque-flow paths by clutches · CPC title

• F16H59/38

  of gearing elements · CPC title