Regenerative braking control method and regenerative braking control device

Patent metadata

Field	Value
Publication number	US-11505071-B2
Application number	US-201716771018-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	Dec 15, 2017
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A regenerative braking control method and a regenerative braking control device of the present invention control a drive source that generates a regenerative brake force in such a manner that an upper limit of regenerative deceleration when a driver executes manual control becomes smaller than an upper limit of regenerative deceleration when automatic control is executed.

First claim

The invention claimed is:

1. A regenerative braking control device comprising a control circuit that controls a drive source that generates a regenerative brake force and that is installed in a vehicle that is switchable by a selection of a driver between a first driving mode in which the driver executes manual control and a second driving mode in which automatic control is executed, wherein
the manual control includes at least adjusting, based on an operation of the driver, a speed of the vehicle and a distance between the vehicle and at least another vehicle,
the automatic control includes at least automatically adjusting the speed of the vehicle and the distance between the vehicle and at least another vehicle, and
a first upper limit of regenerative deceleration in the first driving mode due to the regenerative brake force is set smaller than a second upper limit of the regenerative deceleration in the second driving mode, wherein
in the second driving mode,
a first required acceleration is calculated on a basis of a driving-force instruction from the driver,
a driving-force command value output to the drive source is changed at a rate of change greater than or equal to a rate of change of the first required acceleration.

2. The regenerative braking control device according to claim 1 , wherein
a difference between the first upper limit and the second upper limit is equal to or smaller than a predetermined value.

3. The regenerative braking control device according to claim 1 , wherein
a rate of change of an upper limit of the regenerative deceleration during a transition between the first driving mode and the second driving mode falls within a predetermined range.

4. The regenerative braking control device according to claim 1 , wherein
the second upper limit is a maximum value of the regenerative brake force that can be generated by the drive source.

5. The regenerative braking control device according to claim 1 , wherein
the regenerative deceleration in the first driving mode is calculated on a basis of a command value received from the driver through an input device through which the driver inputs a requirement for an acceleration or a deceleration.

6. The regenerative braking control device according to claim 5 , wherein
the input device is an accelerator pedal.

7. The regenerative braking control device according to claim 1 , wherein
in the second driving mode,
when the first required acceleration is equal to or greater than zero, the first required acceleration is set as the driving-force command value, and
when the first required acceleration is below zero, the driving-force command value is changed at a rate of change greater than the rate of change of the first required acceleration.

8. The regenerative braking control device according to claim 7 , wherein
when the first required acceleration is below zero,
a value obtained by dividing the second upper limit at a timing of starting the driving-force instruction by the first upper limit at the timing is calculated as a predetermined coefficient, and
a value obtained by multiplying the first required acceleration by the predetermined coefficient is calculated as an override upper-limit acceleration, and either a second required acceleration on a basis of the automatic control or the override upper-limit acceleration, whichever is greater in value, is defined as the driving-force command value.

9. The regenerative braking control device according to claim 1 , wherein
when a required deceleration is above the first upper limit in the first driving mode, the required deceleration is generated using the drive source and a friction brake installed in the vehicle.

10. The regenerative braking control device according to claim 1 , wherein
when a required deceleration is above the second upper limit in the second driving mode, the required deceleration is generated using the drive source and a friction brake installed in the vehicle.

Assignees

• Nissan Motor

Inventors

• Nakamura Yohei
• Kuroda Masafumi
• Wada Yuji
• Matsumoto Michihiko

Classifications

• B60L7/18 Primary

  Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence) · CPC title

• B60L2250/28

  Accelerator pedal thresholds · CPC title

• B60T2270/60

  Regenerative braking · CPC title

• B60W30/18127

  Regenerative braking · CPC title

• B60K6/46

  Series type · CPC title