Electric Device Control Method and Electric Device

Patent metadata

Field	Value
Publication number	US-2021162981-A1
Application number	US-201716771143-A
Country	US
Kind code	A1
Filing date	Dec 15, 2017
Priority date	Dec 15, 2017
Publication date	Jun 3, 2021
Grant date	—

Abstract

In an electric device control method and an electric device of the present invention, during a period in which a rotational speed of an internal combustion engine shifting from a non-combustion mode to a combustion mode is decreased to a rotational speed within a predetermined rotational-speed range by a first electric motor connected to the internal combustion engine, a torque generated by the internal combustion engine is set lower than a required torque within the predetermined rotational-speed range for the internal combustion engine in the combustion mode.

First claim

1 . An electric device control method wherein
an electric device including an internal combustion engine and a first electric motor connected to the internal combustion engine performs torque limitation during a period in which the internal combustion engine is shifted from a non-combustion mode to a combustion mode, and a rotational speed of the internal combustion engine is decreased to a rotational speed within a predetermined rotational-speed range by the first electric motor, the torque limitation being performed to set a torque generated by the internal combustion engine so as to become lower than a required torque within the predetermined rotational-speed range for the internal combustion engine in the combustion mode.

2 . The electric device control method according to claim 1 , wherein a rotational-speed decrease rate of the internal combustion engine when the torque limitation is performed is set higher than a rotational-speed decrease rate of the internal combustion engine in the combustion mode.

3 . The electric device control method according to claim 1 , wherein a rotational-speed decrease rate of the internal combustion engine when the torque limitation is performed is set lower than a rotational-speed decrease rate of the internal combustion engine in the combustion mode.

4 . The electric device control method according to claim 1 , wherein, when a difference between a rotational speed of the internal combustion engine and a target rotational speed that falls within the predetermined rotational-speed range is below a predetermined value, the torque limitation is cancelled, and a torque generated by the internal combustion engine is increased to the required torque.

5 . The electric device control method according to claim 4 , wherein after the torque limitation is cancelled, until a torque generated by the internal combustion engine is increased to a predetermined torque threshold, a torque generated by the internal combustion engine is limited such that an increase rate of the torque generated by the internal combustion engine does not exceed a predetermined limitation value.

6 . The electric device control method according to claim 5 , wherein the predetermined torque threshold is a torque generated by the internal combustion engine in order for the first electric motor to generate a required power needed for driving a vehicle having the electric device installed therein.

7 . The electric device control method according to claim 6 , wherein the required power is a power obtained by subtracting a power available for supply from a battery installed in the vehicle from a power needed for a second electric motor to generate a torque needed for driving the vehicle.

8 . The electric device control method according to claim 1 , wherein when a vehicle having the electric device installed therein shifts from deceleration to acceleration, the torque limitation is performed.

9 . An electric device including an internal combustion engine and a first electric motor connected to the internal combustion engine, the electric device comprising:
a control circuit that performs torque limitation during a period in which the internal combustion engine is shifted from a non-combustion mode to a combustion mode, and a rotational speed of the internal combustion engine is decreased to a rotational speed within a predetermined rotational-speed range by the first electric motor, wherein the torque limitation is performed to set a torque generated by the internal combustion engine so as to become lower than a required torque within the predetermined rotational-speed range for the internal combustion engine in the combustion mode.

Assignees

• Nissan Motor

Inventors

• Kobayashi Azusa
• Gotou Kenichi
• Hoshi Kiyoshi

Classifications

• B60Y2300/64

  Drag run or drag torque compensation, e.g. motor to drive engine with drag torque or engine speed is brought to start speed before injection and firing · CPC title

• B60Y2300/192

  Power-up or power-down of the driveline, e.g. start up of a cold engine · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title

• B60W20/14

  in conjunction with braking regeneration · CPC title

• B60W20/17 Primary

  for noise reduction · CPC title