Regenerative braking control method of hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2016152144-A1
Application number	US-201514690136-A
Country	US
Kind code	A1
Filing date	Apr 17, 2015
Priority date	Nov 27, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

A regenerative braking control method of a hybrid vehicle may include determining whether to perform regenerative braking in a regenerative braking determining step, determining whether to stop an engine in an engine stopping determining step, and performing shifting to a lowest gear stage driven by a motor in a preceding shifting step if it is determined in the engine stopping determining step that the engine stops.

First claim

What is claimed is:

1 . A regenerative braking control method of a hybrid vehicle, comprising:
determining, in a regenerative braking determining step, whether to perform regenerative braking; determining, in an engine stopping determining step, whether to stop an engine; and performing shifting, in a preceding shifting step, to a lowest gear stage driven by a motor, if it is determined in the engine stopping determining step that the engine stops.

2 . The regenerative braking control method of a hybrid vehicle according to claim 1 , wherein in the regenerative braking determining step, the regenerative braking is performed by turning off an accel position sensor (APS).

3 . The regenerative braking control method of a hybrid vehicle according to claim 1 , wherein in the engine stopping determining step, the determining of whether to stop the engine depends on whether to charge a battery.

4 . The regenerative braking control method of a hybrid vehicle according to claim 1 , wherein in the preceding shifting step, shifting to the lowest gear stage among gear stages meeting a max RPM of the motor at a current vehicle speed is performed.

5 . The regenerative braking control method of a hybrid vehicle according to claim 1 , further comprising:
after the preceding shifting step, determining, in a motor RPM determining step, whether an RPM of the motor is equal to or less than a rated RPM depending on deceleration of a vehicle speed.

6 . The regenerative braking control method of a hybrid vehicle according to claim 5 , the method further comprising:
determining, in a request torque determining step, whether a request torque of a brake is larger than a maximum torque output at a current gear stage, if it is determined in the motor RPM determining step that the RPM of the motor is equal to or less than the rated RPM.

7 . The regenerative braking control method of a hybrid vehicle according to claim 6 , the method further comprising:
accomplishing, in an engine brake step, the request torque of the brake using friction force of the engine through engagement of a clutch, if it is determined that the request torque of the brake is larger than the maximum torque of the motor.

8 . The regenerative braking control method of a hybrid vehicle according to claim 7 , further comprising:
after the engine brake step, determining, in a torque sum determining step, whether a maximum sum of the torque provided by the engine and the motor is smaller than the request torque of the brake.

9 . The regenerative braking control method of a hybrid vehicle according to claim 8 , further comprising:
increasing, in a brake oil pressure increasing step, a brake oil pressure to satisfy the request torque of the brake, if it is determined in the torque sum determining step that the maximum sum of the torque is smaller than the request torque of the brake.

10 . A regenerative braking control method of a hybrid vehicle, comprising:
performing shifting to a lowest gear stage within a range in which a vehicle is driven by a motor at a current vehicle speed, if it is determined that a regenerative braking is performed.

11 . The regenerative braking control method of a hybrid vehicle according to claim 10 , the method further comprising:
determining whether the engine stops, after it is determined that the regenerative braking is performed, wherein the shifting is performed to shift to an optimal gear stage within the range in which the vehicle is driven by the motor at the current vehicle speed, if it is determined that the engine stops.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Choi Kum Lim

Classifications

• B60W30/18127

  Regenerative braking · CPC title

• B60W10/18

  including control of braking systems · CPC title

• B60W10/11

  Stepped gearings · CPC title

• B60W20/30

  Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)} · CPC title

• B60W30/18136

  Engine braking · CPC title