Method of controlling powertrain of vehicle

Patent metadata

Field	Value
Publication number	US-11724699-B2
Application number	US-202217699930-A
Country	US
Kind code	B2
Filing date	Mar 21, 2022
Priority date	Jun 21, 2021
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A method of controlling a powertrain of a vehicle is carried out such that during shifting in which a first clutch is released and a second clutch is engaged, whether a current shift phase is a torque phase or an inertia phase is determined. Different cost functions for the torque phase and the inertia phase are predefined. A control input change for minimizing the cost functions in the torque phase and the inertia phase is calculated. At least two among input torque, first clutch torque, or second clutch torque input to a transmission are controlled by applying the control input change calculated for the torque phase and the inertia phase.

First claim

What is claimed is:

1. A method of controlling a powertrain of a vehicle, the method comprising:
during shifting in which a first clutch is released and a second clutch is engaged,
determining whether a current shift phase is a torque phase or an inertia phase;
configuring different cost functions for the torque phase and the inertia phase;
calculating a control input change for minimizing the cost functions in the torque phase and the inertia phase; and
controlling at least two among input torque, first clutch torque, or second clutch torque input to a transmission by applying the control input change calculated for the torque phase and the inertia phase;
wherein each of the cost functions is:
min Δ ⁢ u ⁢ ∑ j = 0 N x - 1  z i ( k + j ⁢ ❘ "\[LeftBracketingBar]" k ) - r i ( k )  Q 2 + ∑ j = 0 N u - 1  ⁢ Δ ⁢ u i ( k + j ⁢ ❘ "\[LeftBracketingBar]" k )  R 2 , and i∈{tp,ip},

where tp indicates a torque phase, ip indicates an inertia phase,
N x indicates a prediction horizon,
N u indicates a control horizon,
k indicates a sampling time,
z i indicates a control variable matrix,
r i indicates a control reference matrix,
u i indicates a control input matrix,
Q indicates a wweight matrix for control reference following errors, and
R indicates a weight matrix for a control input change.

2. The method of claim wherein when the shift phase is the torque phase,
the control variable matrix is:
z tp =[α x 4 x 5 x 6 ] T ,

where α indicates a vehicle jerk,
x 4 indicates torsion between the first clutch and a drive wheel,
x 5 indicates the first clutch torque, and
x 6 indicates the second clutch torque, and
the control reference matrix may be:
r tp =[0 r 4 r 5 r 6 ] T ,

where r 4 indicates reference torsion between the first clutch and the drive wheel,
r 5 indicates first reference clutch torque, and
r 6 indicates second reference clutch torque.

3. The method of claim 2 , wherein when the shift phase is the torque phase, the control input matrix is:

u
tp

=

[

u
1

,

u
2

]

T

=

[

dT

c
⁢
1

dt

,

dT

c
⁢
2

dt

]

T

,

where Tc 1 indicates the first clutch torque, and
T c2 indicates the second clutch torque.

4. The method of claim 3 , wherein when the shift phase is the torque phase, the weight matrix for the control reference following errors is:

Q
=

[

q
1

0

0

0

0

q
2

0

0

0

0

q
3

0

0

0

0

q
4

]

,

where q 1 indicates a weight for the vehicle jerk,
q 2 indicates a weight for the torsion between the first clutch and the drive wheel,
q 3 indicates a weight for the first clutch torque, and
q 4 indicates a weight for the second clutch torque, and
the weight matrix for the control input change is:

R
=

[

r
1

0

0

r
2

]

,

where r 1 indicates a weight for a first clutch torque change, and
r 2 indicates a weight for a second clutch torque change.

5. The method of claim 4 , wherein when the shift phase is the torque phase, in the calculation of the control input change for minimizing the cost functions by the optimization,
the control variable matrix meets control variable constr

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Kim Jin Sung

Classifications

• B60W30/19 Primary

  Improvement of gear change, e.g. by synchronisation or smoothing gear shift · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• B60W10/04

  including control of propulsion units · CPC title

• F16D48/06 Primary

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

• F16H61/04

  Smoothing ratio shift · CPC title