Control method for vehicle and vehicle

Patent metadata

Field	Value
Publication number	US-12280766-B1
Application number	US-202218857090-A
Country	US
Kind code	B1
Filing date	Apr 18, 2022
Priority date	Apr 18, 2022
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

A vehicle has an engine, an electric generator, a drive motor, and a battery, the electric generator driven by the engine to generate electric power, the drive motor driven by the electric power, and regenerative electric power of the drive motor supplied to the battery. The vehicle has a first mode in which braking force compensation by a friction brake is executed during accelerator OFF regeneration which is regeneration by the drive motor where no accelerator operation is executed, and a second mode in which the braking force compensation by the friction brake is not executed during the accelerator OFF regeneration. The method includes executing limitation of input to the battery and allowing a voltage of the battery to be zero due to the limitation of input or a physical property value of the battery affecting the voltage to be different between the first mode and the second mode.

First claim

The invention claimed is:

1. A control method for a vehicle, the vehicle including an engine, an electric generator, a drive motor, and a battery, the electric generator being driven by the engine to generate electric power, the drive motor being driven by the electric power generated by the electric generator, and regenerative electric power of the drive motor being supplied to the battery,
the vehicle having a first mode in which braking force compensation by a friction brake is executed during accelerator OFF regeneration which is regeneration by the drive motor in a state where no accelerator operation is executed, and a second mode in which the braking force compensation by the friction brake is not executed during the accelerator OFF regeneration, the method comprising:
executing limitation of electric power input to the battery; and allowing a voltage of the battery, in which the electric power input to the battery is zero due to the limitation of the electric power input, or a physical property value of the battery, affecting the voltage, to be different between the first mode and the second mode.

2. The control method for a vehicle according to claim 1 , wherein
the physical property value includes an SOC of the battery, and
the method further comprises, in a case where the first mode is selected, starting the limitation of input and stopping the regeneration of the drive motor at an SOC lower than that in a case where the second mode is selected.

3. The control method for a vehicle according to claim 1 , further comprising:
executing motoring of the engine by the electric generator, wherein
in a case where the first mode is selected, the electric power input to the battery is limited to zero by the limitation of input before the motoring is started.

4. The control method for a vehicle according to claim 1 , further comprising:
executing motoring of the engine by the electric generator,
executing regenerative electric power control for controlling the regenerative electric power of the drive motor, and
executing generated electric power control for controlling generated electric power of the electric generator, wherein
the limitation of input is applied to the regenerative electric power control, and is not applied to the generated electric power control.

5. The control method for a vehicle according to claim 1 , wherein
the physical property value includes an SOC of the battery,
the method further comprises executing motoring of the engine by the electric generator, and
executing pre-motoring by motorizing the engine by the electric generator at an SOC lower than that in the motoring, and
in a case where the first mode is selected, execution of the pre-motoring is prohibited.

6. The control method for a vehicle according to claim 1 , further comprising:
executing motoring of the engine by the electric generator, wherein
regeneration of the drive motor is stopped by limiting the electric power input to the battery to zero, and
in a case where the first mode is selected while the motoring is being executed, the motoring is continued while a motoring completion condition of the first mode is not satisfied even in a case where a motoring start condition of the first mode is not satisfied.

7. The control method for a vehicle according to claim 1 , wherein
the physical property value includes an SOC of the battery, and
as a change speed of the limitation of input in response to a change in the SOC, a change speed of the limitation of input executed in the first mode is set to be equal to or lower than a response speed of a brake torque compensated by the friction brake.

8. The control method for a vehicle according to claim 1 , wherein
in a case of transition from the second mode to the first mode, as the limitation of input, limitation of input obtained by applying a change rate to available input electric power of the drive motor in the second mode when the first mode is selected and changing the available input electric power according to the change rate is used.

9. The control method for a vehicle according to claim 8 , wherein a change speed of the limitation of input obtained by changing the available input electric power according to the change rate is set equal to or lower than a response speed of a brake torque compensated by the friction brake.

10. A vehicle including an engine, an electric generator, a drive motor, and a battery, the electric generator being driven by the engine to generate electric power, the drive motor being driven by the electric power generated by the electric generator, and regenerative electric power of the drive motor being supplied to the battery, and
the vehicle having a first mode in which braking force compensation by a friction brake is executed during accelerator OFF regeneration which is regeneration by the drive motor in a state where no accelerator operation is executed, and a second mode in which the braking force compensation by the friction brake is not executed during the accelerator OFF regeneration, the vehicle comprising:
a controller configured to allow a voltage of the battery, in which electric power input to the battery is zero due to a limitation of the electric power input to the battery, or a physical property value of the battery, affecting the voltage, to be different between the first mode and the second mode, and execute the limitation of the electric power input.

Assignees

• Nissan Motor

Inventors

• Hoshi Kiyoshi
• Misao Yoshihiko
• Miyakawa Hokuto
• Hagiwara Ryota

Classifications

• B60T1/10

  by utilising wheel movement for accumulating energy, e.g. driving air compressors · CPC title

• B60T2270/604

  Merging friction therewith; Adjusting their repartition · CPC title

• B60K6/46

  Series type · CPC title

• B60W2540/215

  Selection or confirmation of options · CPC title

• B60W2540/16

  Ratio selector position · CPC title