Device for controlling hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2016200310-A1
Application number	US-201414913423-A
Country	US
Kind code	A1
Filing date	Aug 8, 2014
Priority date	Sep 26, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A hybrid vehicle control device includes an engine, a motor/generator, an automatic transmission in which the gear ratio can be fixed by the driver's intention; and a drive wheel. The control device has an assist traveling mode and an engine generation traveling mode as hybrid modes in which the engine and the motor/generator are drive sources. The control device includes a rotational speed limit setting unit which sets a value that exceeds the upper rotational speed limit, at which the motor/generator can carry out a torque output, as the rotational speed limit of the engine motor rotational speed, and a rotational speed limit control unit for reducing the rotational speed limit to the rotational speed limit at which the motor/generator can carry out a torque output, when the engine motor rotational speed has reached the rotational speed limit and there is a torque output request of the motor/generator.

First claim

1 . A hybrid vehicle control device for a hybrid vehicle, the hybrid vehicle control device comprising:
an engine; a motor/generator to which is connected a battery that carries out charging/discharging; a transmission, in which a gear ratio can be fixed by a driver's input; a drive wheel; and a controller programmed to selectively set an assist traveling mode in which the motor/generator outputs a drive torque, and an engine generation traveling mode in which the motor/generator outputs a power generation torque, as hybrid modes in which the engine and the motor/generator are drive sources, the controller being programmed to include
a rotational speed limit setting unit programmed to set a value that exceeds an upper rotational speed limit, at which the motor/generator can carry out a torque output, as a rotational speed limit of an engine motor rotational speed, and
a rotational speed limit control unit programmed to reduce the rotational speed limit to the upper rotational speed at which the motor/generator can carry out a torque output, when the engine motor rotational speed has reached the rotational speed limit, and a torque output request of the motor/generator exists, during the assist traveling mode in a state in which the gear ratio is fixed by the driver's input.

2 . The hybrid vehicle control device according to claim 1 , wherein
the rotational speed limit control unit is programmed to reduce the rotational speed limit more, as an energy storage requirement with respect to the battery is increased.

3 . The hybrid vehicle control device according to claim 2 , wherein
the rotational speed limit control unit is programmed to determine the energy storage requirement to be higher, as an auxiliary machine power consumption, which is consumed by a plurality of auxiliary machines provided to a vehicle, is increased.

4 . The hybrid vehicle control device according to claim 2 , wherein
the rotational speed limit control unit is programmed to determine the energy storage requirement to be higher, as a charge capacity of the battery is reduced.

5 . The hybrid vehicle control device according to claim 1 , wherein
the rotational speed limit control unit is programmed to determine an execution timing for reducing the rotational speed limit, in accordance with an energy storage requirement with respect to the battery.

6 . The hybrid vehicle control device according to claim 5 , wherein
the energy storage requirement is at least the charge capacity of the battery.

7 . The hybrid vehicle control device according to claim 5 , wherein
the rotational speed limit control unit is programmed to delay the execution timing more as a driver's acceleration request becomes greater.

8 . The hybrid vehicle control device according to claim 1 , wherein
the rotational speed limit control unit is programmed to restore the reduced rotational speed limit to a rotational speed limit which is set by the rotational speed limit setting unit, when a deviation condition is met, in which the engine motor rotational speed deviates from a reduced rotational speed limit.

9 . The hybrid vehicle control device according to claim 8 , wherein
the rotational speed limit control unit is programmed to set an occurrence of the engine motor rotational speed being reduced to equal to or less than a predetermined value as the deviation condition.

10 . The hybrid vehicle control device according to claim 1 , wherein
the rotational speed limit control unit is programmed to restore the reduced rotational speed limit to a rotational speed limit which is set by the rotational speed limit setting unit, when the driver's acceleration input is determined to be strong.

11 . The hybrid vehicle control device according to claim 3 , wherein
the rotational speed limit control unit is programmed to determine the energy storage requirement to be higher, as a charge capacity of the battery is reduced.

12 . The hybrid vehicle control device according to claim 2 , wherein
the rotational speed limit control unit is programmed to determine an execution timing for reducing the rotational speed limit, in accordance with an energy storage requirement with respect to the battery.

13 . The hybrid vehicle control device according to claim 12 , wherein
the energy storage requirement is at least the charge capacity of the battery.

14 . The hybrid vehicle control device according to claim 12 , wherein
the rotational speed limit control unit is programmed to delay the execution timing more as a driver's acceleration request becomes greater.

15 . The hybrid vehicle control device according to claim 2 , wherein
the rotational speed limit control unit is programmed to restore the reduced rotational speed limit to a rotational speed limit which is set by the rotational speed limit setting unit, when a deviation condition is met, in which the engine motor rotational speed deviates from a reduced rotational speed limit.

16 . The hybrid vehicle control device according to claim 15 , wherein
the rotational speed limit control unit is programmed to set an occurrence of the engine motor rotational speed being reduced to equal to or less than a predetermined value as the deviation condition.

17 . The hybrid vehicle control device according to claim 2 , wherein
the rotational speed limit control unit is programmed to restore the reduced rotational speed limit to a rotational speed limit which is set by the rotational speed limit setting unit, when the driver's acceleration input is determined to be strong.

Assignees

• Nissan Motor

Inventors

• Amemiya Jun
• Ueno Munetoshi
• Uchida Tatsuya
• Kudo Noboru

Classifications

• B60W20/00 Primary

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title

• B60W10/08

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

• B60W10/06

  including control of combustion engines · CPC title

• B60W10/115

  with planetary gears · CPC title

• B60L15/2054

  by controlling transmissions or clutches · CPC title