Shift control apparatus and method of vehicle

Patent metadata

Field	Value
Publication number	US-9855954-B2
Application number	US-201615271416-A
Country	US
Kind code	B2
Filing date	Sep 21, 2016
Priority date	May 17, 2016
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

The present disclosure relates to a shift control apparatus of a vehicle and its method. In particular, the shift control apparatus includes: a transmission including a first clutch and a second clutch; a torque source to generate power for driving a vehicle; a data detector to detect a vehicle state data; and a vehicle controller to connect a current stage synchronizer to a next stage driving gear if the vehicle state data satisfy a shift condition, release the first clutch to be connected to the driving gear of a current stage, perform a speed control of a torque source while maintaining the second clutch connected to the driving gear of the next stage in a slip state, and release the second clutch and connect the first clutch if the vehicle stage data satisfy a speed control completion condition to complete a shift to a target stage.

First claim

What is claimed is:

1. A shift control apparatus of a vehicle, comprising:
a torque source configured to generate power for driving the vehicle;
a transmission configured to selectively receive the power of the torque source through a first clutch or a second clutch and configured to convert and output the power;
a data detector configured to detect a vehicle state data to control the transmission; and
a vehicle controller configured to connect a synchronizer to a driving gear of a next stage when the vehicle state data satisfy a shift condition, release the first clutch connected to a driving gear of a current stage, perform a speed control of the torque source while maintaining a second clutch connected to the driving gear of the next stage in a slip state, and release the second clutch and connect the first clutch when the vehicle stage data satisfy a speed control completion condition to complete a shift to a target stage.

2. The shift control apparatus of claim 1 , wherein
the vehicle controller uses an inertia and a target speed of an input shaft of the transmission to generate a set value, and the vehicle controller is configured to increase or reduce an input shaft torque of the transmission based on the set value to prepare the speed control of the torque source.

3. The shift control apparatus of claim 1 , wherein
the vehicle controller generates an input shaft speed at the target stage at time when the speed control of the torque source starts, uses the input shaft speed and a torque source speed at the target stage to generate an initial offset, and the vehicle controller splits the initial offset to generate an offset input, and interpolates the offset input to generate the interpolated offset input.

4. The shift control apparatus of claim 3 , wherein
the vehicle controller sets a target timing based on the initial offset, splits a section from the time when the speed control of the torque source starts from a target time into a plurality of sub sections, and sets a slope of the offset input corresponding to the plurality of sub sections, respectively.

5. The shift control apparatus of claim 1 , wherein
the vehicle controller uses at least one of a target speed of the torque source, a current speed of the torque source, and an inertia of an input shaft of the transmission to generate at least one of a feedback control input, a feed forward control input, and an unknown term control input and uses at least one of the feedback control input, the feed forward control input, and the unknown term control input to generate a torque command.

6. The shift control apparatus of claim 1 , wherein
the vehicle controller uses an output speed and a gear ratio of the transmission to generate a speed of an input shaft connected to the first clutch and releases the second clutch and connects the first clutch when a difference value between the speed of the torque source and the speed of the input shaft connected to the first clutch is equal to or less than a first reference value.

7. The shift control apparatus of claim 1 , wherein
the vehicle controller uses an output speed and a gear ratio of the transmission to generate an acceleration of an input shaft connected to the first clutch and releases the second clutch and connects the first clutch when a difference value between an acceleration of the torque source and the acceleration of an input shaft connected to the first clutch is equal to or less than a second reference value.

8. A shift control method of a vehicle including a transmission selectively receiving power of a torque source through a first clutch or a second clutch and converting and outputting the power, the shift control method comprising:
determining whether a shift condition is satisfied based on vehicle state data;
connecting a next stage synchronizer and releasing a first clutch connected to a current stage driving gear, when the shift condition is satisfied;
releasing a current stage synchronizer and coupling a target stage synchronizer;
generating a target speed of the torque source while maintaining a second clutch connected to a next stage driving gear in a slip state;
performing a speed control of the torque source by using the target speed of the torque source;
determining whether a speed control completion condition is satisfied; and
releasing the second clutch connected to the next stage driving gear and connecting the first clutch connected to a target stage driving gear, when the speed control completion condition is satisfied.

9. The shift control method of claim 8 , wherein the generating of the target speed of the torque source includes:
maintaining the first clutch connected to the next stage driving gear in a slip state;
generating a set value by using an inertia and a target speed of an input shaft of the transmission; and
adjusting an input shaft torque of the transmission based on the set value.

10. The shift control method of claim 9 , wherein
the set value is generated based on the following Equation:

α
=

J
*

d
dt

⁢

(

W

TS
⁢

⁢
_
⁢

⁢
Target

)

where, α represents the set value, J represents the inertia of the input shaft of the transmission, and W TS _ Target represents the target speed of the torque source.

11. The shift control method of claim 8 , wherein the generating of the target speed of the torque source includes:
generating a input shaft speed at a target stage at a set time;
generating an initial offset by using the input shaft speed and a speed of the torque source at a target stage;
generating an offset input by splitting the initial offset; and
generating an interpolated offset input by interpolating the offset input.

12. The shift control method of claim 11 , wherein the splitting of the initial offset to generate the offset input includes:
setting a target time based on the initial offset;
splitting a section from the set time to the target time into a plurality of sub sections; and
setting a slope of the offset input corresponding to the plurality of sub sections, respectively.

13. The shift control method of claim 12 , wherein the plurality of sub sections include first to third sections.

14. The shift control method of claim 13 , wherein a first slope of the offset input corresponding to the first section is set based on the speed of the torque source at the set time and a third slope of the offset input corresponding to the third section is set based on the slope of the offset input corresponding to the second section and a slope of a speed of an output shaft of the transmission.

15. The shift control method of claim 14 , wherein a second slope of the offset input corresponding to the second section is set based on the first slope among values satisfying the following Equation:

Assignees

• Hyundai Motor Co Ltd

Inventors

• Bang Jae Sung

Classifications

• B60W2710/021

  Clutch engagement state · CPC title

• B60W2710/1005

  Transmission ratio engaged · CPC title

• B60W10/113

  with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch · CPC title

• F16H2059/462

  Detecting synchronisation, i.e. speed difference is approaching zero · CPC title

• F16H61/465

  for achieving a target input speed · CPC title