Electric device control method and electric device

Patent metadata

Field	Value
Publication number	US-11312362-B2
Application number	US-201716771143-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	Dec 15, 2017
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

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

The invention claimed is:

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 during the period, 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 during the period, 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

• B60W20/15 Primary

  Control strategies specially adapted for achieving a particular effect · CPC title

• B60K6/46 Primary

  Series type · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W20/17 Primary

  for noise reduction · CPC title

• B60W10/06 Primary

  including control of combustion engines · CPC title