Control device for hybrid vehicle, hybrid vehicle provided with same, and control method for hybrid vehicle

Patent metadata

Field	Value
Publication number	US-9555799-B2
Application number	US-201314434447-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Jan 16, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

In a control device for a hybrid vehicle, the charge/discharge setting unit sets a charge/discharge demand for an electricity storage device during a limp home mode, and the operation control unit controls an engine and a motor generator such that the electricity storage device receives/outputs a power in accordance with the charge/discharge demand set by the charge/discharge setting unit. In the case where a charge/discharge amount X input/output to/from the electricity storage device when the engine is operated to generate a required driving force is smaller than a charge/discharge amount Y based on the charged state of the electricity storage device, the charge/discharge setting unit sets, as the charge/discharge demand, the smaller one of the charge/discharge amount Y and a charge/discharge amount Z based on the upper-limit rotation speed of the engine set in accordance with a torque transmitted by a drive shaft.

First claim

The invention claimed is:

1. A control device for a hybrid vehicle, the hybrid vehicle including an internal combustion engine, a first rotating electric machine, a second rotating electric machine, a planetary gear, and an electricity storage device, the second rotating electric machine being configured to drive a drive shaft, the planetary gear being mechanically coupled to an output shaft of the internal combustion engine, to a rotating shaft of the first rotating electric machine, and to the drive shaft, the electricity storage device being configured to give/receive an electric power to/from the first and second rotating electric machines, the control device comprising:
a controller configured to set a drive mode to a limp home mode in which the internal combustion engine and the first rotating electric machine are driven to drive the hybrid vehicle, when an abnormality in the second rotating electric machine is sensed,
the controller being configured to set the smaller one of a second charge/discharge amount and a third charge/discharge amount as a charge/discharge demand, in a case where a first charge/discharge amount is smaller than a second charge/discharge amount during the limp home mode,
the first charge/discharge amount being a charge/discharge amount that is input/output to/from the electricity storage device when the internal combustion engine is operated so as to generate a driving force required for the hybrid vehicle,
the second charge/discharge amount being based on a charged state of the electricity storage device, and
the third charge/discharge amount being based on an upper-limit rotation speed of the internal combustion engine that is set in accordance with a torque transmitted by the drive shaft, and
the controller being configured to control the internal combustion engine and the first rotating electric machine such that the electricity storage device receives/outputs an electric power in accordance with the set charge/discharge demand.

2. The control device for a hybrid vehicle according to claim 1 , wherein the controller is configured to set the upper-limit rotation speed lower as the torque transmitted by the drive shaft is smaller.

3. The control device for a hybrid vehicle according to claim 1 , wherein
the controller is configured to control the internal combustion engine and the first rotating electric machine such that the electricity storage device receives/outputs the electric power in accordance with the charge/discharge demand, while maintaining an output torque from the internal combustion engine at a value of the required driving force.

4. The control device for a hybrid vehicle according to claim 1 , wherein
the controller is configured to set the third charge/discharge amount smaller as the upper-limit rotation speed is lower.

5. The control device for a hybrid vehicle according to claim 1 , wherein
the controller is configured to set the second charge/discharge amount smaller as a state amount showing the charged state of the electricity storage device is larger.

6. The control device for a hybrid vehicle according to claim 1 , wherein
the controller is configured to set the first charge/discharge amount on the basis of the required driving force and a predetermined operating line for setting an operating point of the internal combustion engine, the predetermined operating line representing a relationship between a rotation speed of the internal combustion engine and a torque that can be output from the internal combustion engine.

7. The control device for a hybrid vehicle according to claim 1 , wherein
the controller is configured to set the first charge/discharge amount as the charge/discharge demand when the first charge/discharge amount is equal to or larger than the second charge/discharge amount.

8. A hybrid vehicle provided with the control device according to claim 1 .

9. A control method for a hybrid vehicle, the hybrid vehicle including an internal combustion engine, a first rotating electric machine, a second rotating electric machine, a planetary gear, an electricity storage device, and a controller, the planetary gear being mechanically coupled to an output shaft of the internal combustion engine, to a rotating shaft of the first rotating electric machine, and to a drive shaft, the electricity storage device being configured to give/receive an electric power to/from the first and second rotating electric machines, the control method comprising:
setting, by the controller, a drive mode to a limp home mode in which the internal combustion engine and the first rotating electric machine are driven to drive the hybrid vehicle, when an abnormality in the second rotating electric machine is sensed;
setting, by the controller, the smaller one of a second charge/discharge amount and a third charge/discharge amount as a charge/discharge demand, in a case where a first charge/discharge amount is smaller than a second charge/discharge amount during the limp home mode,
the first charge/discharge amount being a charge/discharge amount that is input/output to/from the electricity storage device when the internal combustion engine is operated so as to generate a driving force required for the hybrid vehicle,
the second charge/discharge amount being based on a charged state of the electricity storage device, and
the third charge/discharge amount being based on an upper-limit rotation speed of the internal combustion engine that is set in accordance with a torque transmitted by the drive shaft; and
controlling, by the controller, the internal combustion engine and the first rotating electric machine such that the electricity storage device receives/outputs an electric power in accordance with the charge/discharge demand.

Assignees

• Hayakawa Yuki
• Toyota Motor Co Ltd

Inventors

• Hayakawa Yuki

Classifications

• B60W20/50 Primary

  Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode · CPC title

• B60W2050/0295

  Inhibiting action of specific actuators or systems · CPC title

• B60W10/08

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

• B60W2710/0644

  Engine speed · CPC title

• B60K6/445

  Differential gearing distribution type · CPC title