Control device for vehicle and control method for vehicle

Patent metadata

Field	Value
Publication number	US-11365805-B2
Application number	US-201816636495-A
Country	US
Kind code	B2
Filing date	Jul 30, 2018
Priority date	Aug 9, 2017
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A vehicle includes a transmission having a variator and a sub-transmission mechanism, a controller serving as a shift control unit adapted to, as shift of the transmission, shift the sub-transmission mechanism and the variator so that a through speed ratio becomes a target speed ratio, and an engine serving as a torque increasing portion adapted to increase a torque inputted to the transmission in association with the shift of the transmission. The controller has a torque setting unit adapted to make a magnitude of an inclination larger as an increase amount of the engine rotation speed in association with the shift of the transmission is larger.

First claim

The invention claimed is:

1. A control device for a vehicle including at least one controller, the control device being adapted to perform control in the vehicle having:
a transmission having a variator and a stepped automatic transmission mechanism which are arranged in series with respect to each other in a power transmission route connecting a travel drive source and a drive wheel;
the at least one controller adapted to, as a shift of the transmission, control the transmission to shift the stepped automatic transmission mechanism and the variator so that a speed ratio of the transmission becomes a target speed ratio; and
a torque increasing portion adapted to increase torque inputted to the transmission in association with the shift of the transmission, the torque increasing portion corresponding to the travel drive source or another drive source, wherein
the at least one controller is adapted to make an increase degree of the torque inputted to the transmission larger as an increase amount of rotation speed of the torque increasing portion in association with the shift of the transmission is larger, the at least one controller making the increase degree of the torque inputted to the transmission larger as a deviation amount between a reached speed ratio of the transmission and the target speed ratio is larger, the reached speed ratio being set in accordance with vehicle speed and an accelerator pedal opening and the target speed ratio serving as the reached speed ratio after filtering processing.

2. The control device for the vehicle according to claim 1 , wherein
upon downshift of the stepped automatic transmission mechanism, the at least one controller makes the increase degree of the torque inputted to the transmission smaller in a case where the variator is upshifted than in a case where the variator is downshifted.

3. The control device for the vehicle according to claim 1 , wherein
upon downshifting the speed ratio of the transmission on a basis of an acceleration request, the at least one controller ends an increase in the torque inputted to the transmission on a basis of an end of an inertia phase in the stepped automatic transmission mechanism.

4. The control device for the vehicle according to claim 3 , wherein
upon decreasing the increased torque inputted to the transmission after the end of the inertia phase, the at least one controller makes a decrease degree of the torque inputted to the transmission smaller as the deviation amount is smaller.

5. The control device for the vehicle according to claim 4 , wherein
the at least one controller sets the decrease degree so that vehicle front-rear acceleration is positive.

6. A control method for a vehicle having:
a transmission having a variator and a stepped automatic transmission mechanism which are arranged in series with respect to each other in a power transmission route connecting a travel drive source and a drive wheel; and
a torque increasing portion adapted to increase torque inputted to the transmission in association with a shift of the transmission, the torque increasing portion corresponding to the travel drive source or another drive source,
the control method for the vehicle in a case where, as the shift of the transmission, the stepped automatic transmission mechanism and the variator are shifted so that a speed ratio of the transmission becomes a target speed ratio by controlling the transmission,
the control method comprising:
making an increase degree of the torque inputted to the transmission larger as an increase amount of rotation speed of the torque increasing portion in association with the shift of the transmission is larger; and
upon making the increase degree of the torque inputted to the transmission lager, making the increase degree of the torque inputted to the transmission larger as a deviation amount between a reached speed ratio of the transmission and the target speed ratio is larger, the reached speed ratio being set in accordance with vehicle speed and an accelerator pedal opening and the target speed ratio serving as the reached speed ratio after filtering processing.

7. A control device for a vehicle, the control device being adapted to perform control in the vehicle having:
a transmission having a variator and a stepped automatic transmission mechanism which are arranged in series with respect to each other in a power transmission route connecting a travel drive source and a drive wheel;
shift control means for controlling the transmission to shift shifting the stepped automatic transmission mechanism and the variator so that a speed ratio of the transmission becomes a target speed ratio as a shift of the transmission; and
a torque increasing portion adapted to increase torque inputted to the transmission in association with the shift of the transmission, the torque increasing portion corresponding to the travel drive source or another drive source,
the control device comprising:
torque setting means for making an increase degree of the torque inputted to the transmission larger as an increase amount of rotation speed of the torque increasing portion in association with the shift of the transmission is larger, wherein
the torque setting means make the increase degree of the torque inputted to the transmission larger as a deviation amount between a reached speed ratio of the transmission and the target speed ratio is larger, the reached speed ratio being set in accordance with vehicle speed and an accelerator pedal opening and the target speed ratio serving as the reached speed ratio after filtering processing.

Assignees

• Jatco Ltd
• Nissan Motor

Inventors

• Kitagawa Seiya
• Honma Tomoaki

Classifications

• F16H59/18

  dependent on the position of the accelerator pedal · CPC title

• F16H59/40

  Output shaft speed · CPC title

• B60K6/547

  the transmission being a stepped gearing · CPC title

• F16H61/6645 Primary

  controlling shifting exclusively as a function of speed and torque · CPC title

• B60W10/10

  including control of change-speed gearings · CPC title