Control method and control device for internal combustion engine for vehicle

Patent metadata

Field	Value
Publication number	US-12078118-B2
Application number	US-202118262202-A
Country	US
Kind code	B2
Filing date	Nov 29, 2021
Priority date	Jan 22, 2021
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A control device and method controls a vehicle having an internal combustion engine connected to an automatic transmission via a torque converter with a lockup device. The torque of the internal combustion engine is limited the by a torque limit value based on a speed difference between an input rotational speed and an output rotational speed of the torque converter during acceleration in a non-lockup state. The torque-limiting of the internal combustion engine is prohibited torque-limiting upon a prescribed condition being met. The prescribed condition is met by a heating request, during hill climbing/towing, during travel at high vehicle speeds, when the accelerator pedal opening angle exceeds or is equal to a prescribed opening angle, when the torque limit value is greater than a target torque, in a range other than a D range, or in a mode other than normal mode.

First claim

The invention claimed is:

1. A control method for a vehicle having an internal combustion engine connected to an automatic transmission via a torque converter with a lockup device, the control method comprising:
limiting a torque of an internal combustion engine to a torque limit value based on a speed difference between an input rotational speed and an output rotational speed of the torque converter during acceleration in a non-lockup state, and
prohibiting torque-limiting upon a prescribed condition being met.

2. The control method for according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when an accelerator opening angle is greater than or equal to a prescribed opening angle.

3. The control method according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when the vehicle is climbing a hill.

4. The control method according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when the vehicle is towing another vehicle.

5. The control method according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when a high vehicle speed is greater than or equal to a prescribed vehicle speed.

6. The control method according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when there is a heating demand of the vehicle as the prescribed condition.

7. The control method according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when the range position of the automatic transmission is other than a D range.

8. The control method according to claim 1 , wherein
the prescribed condition for the prohibiting of the torque-limiting is met when a shift mode of the automatic transmission is other than a normal mode.

9. The control method according to claim 1 , wherein
the torque-limiting is canceled when a target torque limit value during limiting after torque-limiting has started exceeds a target torque corresponding to an accelerator opening angle.

10. A control device for a vehicle internal combustion engine connected to an automatic transmission via a torque converter with a lockup device, the control device comprising:
a controller configured to control a torque of the internal combustion engine to the automatic transmission,
the controller being configured to limit the torque of the internal combustion engine to a torque limit value based on the speed difference between an input rotational speed and an output rotational speed of the torque converter during acceleration in a non-lockup state, and
the controller being further configured to prohibit torque-limiting upon a prescribed condition being met.

Assignees

• Nissan Motor
• Jatco Ltd

Inventors

• Nishiyama Tetsuya
• Kishi Daigo
• Nakano Tatsuo
• Takahashi Seiichirou
• Saito Koji
• Inuta Yukiyoshi
• Arimatsu Takao
• Endo Yasuhiro

Classifications

• F02D2200/602

  Pedal position · CPC title

• F02D2200/501

  Vehicle speed · CPC title

• F02D2200/1002

  Output torque · CPC title

• F02D41/10

  for acceleration · CPC title

• F02D41/0225

  in relation with the gear ratio or shift lever position · CPC title