Control device for hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2019161069-A1
Application number	US-201816200860-A
Country	US
Kind code	A1
Filing date	Nov 27, 2018
Priority date	Nov 29, 2017
Publication date	May 30, 2019
Grant date	—

Abstract

A vehicle includes a first motor generator that generates electric power using power of an engine, a battery, and a second motor generator that is connected to drive wheels and is driven by electric power supplied from the battery and the first motor generator. An ECU of the vehicle drives the first motor generator as an electric motor with a regenerative electric power, executes a braking control, in which a load of the first motor generator functions as the engine, when an SOC is equal to or more than a threshold value of a waste electric-power start, and changes the threshold of the waste electric-power start based on a running condition of the hybrid vehicle.

First claim

1 . A control device for a hybrid vehicle including an internal combustion engine, a first motor generator that generates electric power using power of the internal combustion engine, a battery, and a second motor generator that is connected to drive wheels and is driven by electric power supplied from at least one of the battery and the first motor generator, the battery being chargeable with regenerative electric power obtained by operating the second motor generator as a generator during braking of the drive wheels, the control device being configured to:
drive the first motor generator as an electric motor with the regenerative electric power; execute a braking control, in which a load of the first motor generator functions as the internal combustion engine, when a variable representing a state of charge of the battery according to high and low of a value is equal to or more than a predetermined value; and change the predetermined value based on a running condition of the hybrid vehicle.

2 . The control device according to claim 1 , wherein
the control device determines whether the hybrid vehicle is in a continuous descending state in which the vehicle continues to run a downhill road, and sets the predetermined value to a smaller value in a case of determining that the vehicle is in the continuous descending state rather than in a case of determining that the vehicle is not in the continuous descending state.

3 . The control device according to claim 2 , wherein
the braking control includes a first braking control of performing both a charge of the battery with the regenerative electric power and a drive of the first motor generator with the regenerative electric power and a second braking control of performing only the drive of the first motor generator with the regenerative electric power, and an amount of the regenerative electric power used for the drive of the first motor generator is controlled, based on the variable, during the first braking control.

4 . The control device according to claim 3 , wherein
during the first braking control, the amount of the regenerative electric power used for the drive of the first motor generator increases as the variable is higher.

5 . The control device according to claim 2 , wherein
the braking control includes a first braking control of performing both a charge of the battery with the regenerative electric power and a drive of the first motor generator with the regenerative electric power and a second braking control of performing only the drive of the first motor generator with the regenerative electric power, and an amount of the regenerative electric power used for the drive of the first motor generator is controlled, based on a running speed of the hybrid vehicle, during the first braking control.

6 . The control device according to claim 5 , wherein
during the first braking control, the amount of the regenerative electric power used for the drive of the first motor generator increases as the running speed is higher.

7 . The control device according to claim 2 , wherein
the braking control includes a first braking control of performing both a charge of the battery with the regenerative electric power and a drive of the first motor generator with the regenerative electric power and a second braking control of performing only the drive of the first motor generator with the regenerative electric power, and an amount of the regenerative electric power used for the drive of the first motor generator is controlled, based on the variable and a running speed of the hybrid vehicle, during the first braking control.

8 . The control device according to claim 7 , wherein
the control device calculates a revolution speed of the internal combustion engine, during the first braking control, based on the variable and the running speed, controls the amount of the regenerative electric power used for the first motor generator so as to be the calculated revolution speed when the calculated revolution speed is equal to or more than a lower limit value of the revolution speed set in advance according to the running speed, and controls the amount of the regenerative electric power used for the first motor generator so as to be the lower limit value of the revolution speed when the calculated revolution speed is less than the lower limit value, and the lower limit value is set to a larger value as the running speed is higher.

9 . The control device according to claim 2 , wherein
the control device determines whether the vehicle is in the continuous descending state based on a running distance of the hybrid vehicle and a gradient of a downhill road on which the hybrid vehicle is running.

10 . The control device according to claim 2 , wherein
the control device determines whether the vehicle is in the continuous descending state based on the running speed of the hybrid vehicle and a gradient of a downhill road on which the hybrid vehicle is running.

Assignees

• Honda Motor Co Ltd

Inventors

• Yui Naoki

Classifications

• B60W2552/15

  Road slope, i.e. the inclination of a road segment in the longitudinal direction · CPC title

• B60W20/00

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

• B60L7/10

  Dynamic electric regenerative braking (B60L7/22 takes precedence) · CPC title

• B60W10/26

  for electrical energy, e.g. batteries or capacitors · CPC title

• B60W2710/086

  Power · CPC title