Apparatus and method for shift control in vehicle

Patent metadata

Field	Value
Publication number	US-10933873-B2
Application number	US-201916576142-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	May 13, 2019
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

An apparatus for shift control in a vehicle includes: a transmission; an acceleration apparatus; and a control circuit electrically connected with the transmission and the acceleration apparatus. The control circuit shifts the transmission from a drive state to a neutral state when an activation condition for coasting is satisfied during travel of the vehicle, and corrects an oil pressure for release of a clutch in the transmission at the time of a kickdown shift, when a driver's input for kickdown is detected through the acceleration apparatus during the coasting.

First claim

What is claimed is:

1. An apparatus for shift control of a vehicle, the apparatus comprising:
a transmission;
an acceleration apparatus; and
a control circuit electrically connected with the transmission and the acceleration apparatus,
wherein the control circuit is configured to:
shift the transmission from a drive state to a neutral state when an activation condition for coasting is satisfied during travel of the vehicle,
determine whether a driver's input to the acceleration apparatus is an operation for a kickdown, based on an input pattern for the acceleration apparatus, and
correct an oil pressure for release of a clutch in the transmission at the time of a kickdown shift, when the driver's input for the kickdown is detected through the acceleration apparatus during the coasting.

2. The apparatus of claim 1 , wherein the control circuit changes a bit which is for determining whether to correct the oil pressure, when the driver's input for the kickdown is detected during the coasting.

3. The apparatus of claim 1 , wherein the control circuit corrects the oil pressure to reduce a shift time when performing the kickdown shift.

4. The apparatus of claim 1 , wherein the control circuit adjusts the oil pressure to be different from an oil pressure for the kickdown when the coasting is deactivated.

5. The apparatus of claim 1 , wherein the control circuit corrects the oil pressure to be lower than a specified level, when performing the kickdown shift.

6. The apparatus of claim 1 , wherein the control circuit corrects a control duty for control of the oil pressure to be lower than a specified level, when performing the kickdown shift.

7. The apparatus of claim 1 , wherein the control circuit prohibits learning associated with the kickdown, when the driver's input for the kickdown is detected during the coasting.

8. The apparatus of claim 1 , wherein the control circuit corrects the oil pressure at a shift synchronization point after performing the kickdown shift.

9. The apparatus of claim 1 , wherein the control circuit corrects a control duty for control of the oil pressure to be higher than a specified level at a shift synchronization point, after performing the kickdown shift.

10. The apparatus of claim 1 , wherein the control circuit corrects a target turbine revolutions-per-minute (RPM) variation and a Proportional-Integral-Derivative (PID) control gain for feedback control at a shift synchronization point, after performing the kickdown shift.

11. A method for shift control of a vehicle, the method comprising:
shifting a transmission from a drive state to a neutral state when an activation condition for coasting is satisfied during travel of the vehicle;
determining whether a driver's input to an acceleration apparatus is an operation for a kickdown, based on an input pattern for the acceleration apparatus; and
correcting an oil pressure for release of a clutch in the transmission at the time of a kickdown shift, when the driver's input for the kickdown is detected through the acceleration apparatus during the coasting.

12. The method of claim 11 , wherein the correcting an oil pressure includes correcting the oil pressure to reduce a shift time when performing the kickdown shift.

13. The method of claim 11 , wherein the correcting an oil pressure includes adjusting the oil pressure to be different from an oil pressure for the kickdown when the coasting is deactivated.

14. The method of claim 11 , wherein the correcting an oil pressure includes correcting the oil pressure to be lower than a specified level, when performing the kickdown shift.

15. The method of claim 11 , wherein the correcting an oil pressure includes correcting a control duty for control of the oil pressure to be lower than a specified level, when performing the kickdown shift.

16. The method of claim 11 , further comprising prohibiting learning associated with the kickdown, when the driver's input for the kickdown is detected during the coasting.

17. The method of claim 11 , further comprising correcting the oil pressure at a shift synchronization point after performing the kickdown shift.

18. The method of claim 11 , further comprising correcting a target turbine revolutions-per-minute (RPM) variation and a Proportional-Integral-Derivative (PID) control gain for feedback control at a shift synchronization point, after performing the kickdown shift.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Park Sang Jun
• Jeon Byeong Wook
• Park Kwang Hee
• Kook Jae Chang

Classifications

• F16H2061/0078

  Linear control, e.g. PID, state feedback or Kalman · CPC title

• F16H2061/207

  by neutral control · CPC title

• F16H59/20

  Kickdown · CPC title

• F16H2059/186

  Coasting · CPC title

• F16H61/38

  Control of exclusively fluid gearing · CPC title