Hybrid vehicle

Patent metadata

Field	Value
Publication number	US-11052900-B2
Application number	US-201816224048-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 20, 2017
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

The hybrid vehicle is configured to control an engine and a motor, such that the vehicle is driven in one drive mode among a plurality of drive modes including a Charge Depleting or CD mode in which electric power in a power storage device is consumed and a Charge Sustaining or CS mode in which state of charge of the power storage device is sustained. When a sequential position is selected by a driver in an accelerator-off state, the hybrid vehicle narrows a range of a braking torque applicable to the vehicle in the CD mode as the drive mode, compared with in the CS mode as the drive mode.

First claim

The invention claimed is:

1. A hybrid vehicle, comprising:
an engine configured to output power to a driveshaft coupled with an axle;
a motor configured to input and output power from and to the driveshaft;
a power storage device configured to transmit electric power to and from the motor;
a shifter configured to select one shift position among a plurality of shift positions including a sequential position that allows for a sequential shift operation to change a braking torque applied to the vehicle in an accelerator-off state; and
a control device configured to control the engine and the motor, such that the vehicle is driven in one drive mode among a plurality of drive modes including a Charge Depleting or CD mode in which the electric power in the power storage device is consumed and a Charge Sustaining or CS mode in which state of charge of the power storage device is sustained, wherein:
when the sequential position is selected by a driver in the accelerator-off state, the control device narrows a range of the braking torque applicable to the vehicle in the CD mode as the drive mode, compared with in the CS mode as the drive mode,
the sequential shift operation comprises an operation of changing the braking torque in the accelerator-off state into a stage corresponding to one of a plurality of virtual speeds by an upshift instruction or a downshift instruction,
the control device reduces a required braking torque at a higher speed to be lower than the required braking torque at a lower speed, and
at the sequential position selected by the driver in the accelerator-off state and in the CD mode as the drive mode, when the required braking torque based on the driver's sequential shift operation is larger than an upper limit of the range of the braking torque selectable in the CD mode as the drive mode, the control device upshifts the speed, irrespective of the driver's sequential shift operation.

2. The hybrid vehicle according to claim 1 ,
wherein the range of the braking torque applicable to the vehicle in the CD mode as the drive mode is a range of the braking torque that is allowed to be output from the motor.

3. The hybrid vehicle according to claim 1 ,
wherein at the sequential position selected by the driver in the accelerator-off state and in the CD mode as the drive mode, when a required braking torque based on the driver's sequential shift operation is larger than an upper limit of the range of the braking torque selectable in the CD mode as the drive mode, the control device controls the engine and the motor such that a braking torque smaller than the required braking torque is applied to the vehicle.

4. A hybrid vehicle, comprising:
an engine configured to output power to a driveshaft coupled with an axle;
a motor configured to input and output power from and to the driveshaft;
a power storage device configured to transmit electric power to and from the motor;
a shifter configured to select one shift position among a plurality of shift positions including a sequential position that allows for a sequential shift operation to change a braking torque applied to the vehicle in an accelerator-off state; and
a control device configured to control the engine and the motor, such that the vehicle is driven in one drive mode among a plurality of drive modes including a Charge Depleting or CD mode in which the electric power in the power storage device is consumed and a Charge Sustaining or CS mode in which state of charge of the power storage device is sustained,
wherein when the sequential position is selected by a driver in the accelerator-off state, the control device narrows a range of the braking torque applicable to the vehicle in the CD mode as the drive mode, compared with in the CS mode as the drive mode, and
wherein at the sequential position selected by the driver in the accelerator-off state and in the CD mode as the drive mode, when a required braking torque based on the driver's sequential shift operation is larger than an upper limit of the range of the braking torque selectable in the CD mode as the drive mode, the control device controls the engine and the motor such that a braking torque smaller than the required braking torque is applied to the vehicle.

5. The hybrid vehicle according to claim 4 ,
wherein the range of the braking torque applicable to the vehicle in the CD mode as the drive mode is a range of the braking torque that is allowed to be output from the motor.

Assignees

• Toyota Motor Co Ltd

Inventors

• Shibata Tomoyuki

Classifications

• B60W50/085

  Changing the parameters of the control units, e.g. changing limit values, working points by control input · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B60W10/18

  including control of braking systems · CPC title

• B60W2540/16

  Ratio selector position · CPC title

• B60W2540/10

  Accelerator pedal position · CPC title