U.S. patent application number 12/646712 was filed with the patent office on 2010-05-13 for method for control regenerative braking of electric vehicle.
This patent application is currently assigned to Hyundai Motor Company. Invention is credited to Gab Bae Jeon, Byeong Cheol Yang.
Application Number | 20100117567 12/646712 |
Document ID | / |
Family ID | 39329265 |
Filed Date | 2010-05-13 |
United States Patent
Application |
20100117567 |
Kind Code |
A1 |
Jeon; Gab Bae ; et
al. |
May 13, 2010 |
METHOD FOR CONTROL REGENERATIVE BRAKING OF ELECTRIC VEHICLE
Abstract
A method for controlling regenerative braking of a vehicle
includes initiating the regenerative braking, detecting an amount
of slip of a wheel during the regenerative braking, if the amount
of slip is increasing, reducing a regenerative braking torque, and
if the amount of slip is greater than a set value, actuating an
antilock brake system and reducing the regenerative braking torque
or a hydraulic braking torque continuously until the vehicle is
stopped. Alternatively, if the amount of slip is increasing, the
regenerative braking torque is not reduced.
Inventors: |
Jeon; Gab Bae; (Gunpo-si,
KR) ; Yang; Byeong Cheol; (Daegu, KR) |
Correspondence
Address: |
MORGAN, LEWIS & BOCKIUS LLP (SF)
One Market, Spear Street Tower, Suite 2800
San Francisco
CA
94105
US
|
Assignee: |
Hyundai Motor Company
Seoul
KR
|
Family ID: |
39329265 |
Appl. No.: |
12/646712 |
Filed: |
December 23, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
11648765 |
Dec 29, 2006 |
7654620 |
|
|
12646712 |
|
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Current U.S.
Class: |
318/376 |
Current CPC
Class: |
B60L 3/10 20130101; B60T
1/10 20130101; B60L 7/18 20130101; B60T 8/58 20130101; H02P 23/12
20130101; B60T 2270/604 20130101; Y02T 10/64 20130101; B60T 8/267
20130101; Y02T 10/642 20130101 |
Class at
Publication: |
318/376 |
International
Class: |
H02P 3/14 20060101
H02P003/14 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 26, 2006 |
KR |
10-2006-0104302 |
Oct 26, 2006 |
KR |
10-2006-0104304 |
Claims
1. A method for controlling regenerative braking of a vehicle,
comprising: initiating the regenerative braking; detecting an
amount of slip of a wheel during the regenerative braking; if the
amount of slip is increasing, reducing a regenerative braking
torque; and if the amount of slip is greater than a set value,
actuating an antilock brake system and reducing the regenerative
braking torque continuously until the vehicle is stopped.
2. The method of claim 1, wherein a hydraulic torque is used if the
regenerative braking torque is insufficient.
3. The method of claim 2, wherein the hydraulic braking torque is
reduced if a needed reducing amount of braking torque is larger
than a reducing amount of the regenerative braking torque.
4. A method for controlling regenerative braking of a vehicle,
comprising: initiating the regenerative braking; detecting an
amount of slip of a wheel during the regenerative braking; if the
amount of slip is increasing, not reducing a regenerative braking
torque; and if the amount of slip is greater than a set value,
actuating an antilock brake system and reducing the regenerative
braking torque continuously until the vehicle is stopped.
5. A method for controlling regenerative braking of a vehicle,
comprising: initiating the regenerative braking; detecting an
amount of slip of a wheel during the regenerative braking; if the
amount of slip is increasing, not reducing a regenerative braking
torque; and if the amount of slip is greater than a set value,
actuating an antilock brake system and reducing a hydraulic braking
torque continuously until the vehicle is stopped.
6. The method of claim 5, wherein the regenerative braking torque
is reduced if a needed reducing amount of braking torque is larger
than a reducing amount of the hydraulic braking torque.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] The present application is a divisional application of U.S.
patent application Ser. No. 11/648,765 filed Dec. 29, 2006, which
claims priority to Korean Patent Application Nos. 10-2006-0104302
and 10-2006-0104304, both filed on Oct. 26, 2006, in the Korean
Intellectual Property Office, the entire content of which
applications is incorporated herein for all purposes by this
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a method for controlling
regenerative braking of an electric vehicle, and more particularly
to a method for controlling regenerative braking of an electric
vehicle that reduces regenerated braking torque gradually.
[0004] 2. Description of the Related Art
[0005] Generally, an electric vehicle uses regenerative braking.
Sometimes sufficient braking can not be obtained with only
regenerative braking. An electric vehicle thus also contains a
hydraulic brake system to elicit braking force by oil pressure
[0006] US patent published No. 2002/018266 discloses a braking
force control system in the beginning of ABS control during
regenerative braking. The regenerative braking torque is decreased
progressively and when ABS control has begun, the regenerative
braking is turned off, then the necessary braking torque is
controlled by hydraulic pressure.
[0007] During regenerative braking, when reducing the regenerative
braking torque before beginning the ABS activation, energy recovery
is decreased. Furthermore, when the regenerative braking is turned
off, the actual braking force is lower than the goal braking
force.
[0008] The above information disclosed in this Background section
is only for enhancement of understanding of the background of the
invention and therefore it may contain information that does not
form the prior art that is already known in this country to a
person of ordinary skill in the art.
SUMMARY OF THE INVENTION
[0009] The present invention provides a method for controlling
regenerative braking of an electric vehicle. During the
regenerative braking, the regenerative braking torque is reduced
progressively before and during ABS control.
[0010] An exemplary method for controlling regenerative braking
includes beginning regenerative braking, detecting an amount of
slip of a front wheel, reducing the regenerative braking torque if
the amount of slip is increasing before an ABS is actuated, and
continuing to reduce the regenerative braking torque during the ABS
actuating if the amount of slip is larger than a standard
value.
[0011] If regenerative braking torque is insufficient during the
ABS activation, hydraulic torque may be used.
[0012] Further, after actuating the ABS, if the necessary reduction
amount of braking torque is more than the reduction amount of the
regenerative braking torque, the hydraulic braking torque is
decreased.
[0013] An alternative method includes: beginning regenerative
braking of the electric vehicle, detecting a front wheel slip
amount during the regenerative braking, if the front wheel slip
amount is above a standard value, actuating the ABS and
continuously decreasing the regenerative braking torque until the
vehicle is stopped, and if the front wheel slip amount is
increasing before actuating the ABS, not decreasing the
regenerative braking amount.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] These and other aspects of the invention will become
apparent and more readily appreciated from the following
description of the preferred embodiments, taken in conjunction with
the accompanying drawings, in which:
[0015] FIG. 1 illustrates a method for controlling regenerative
braking according to a first exemplary embodiment of the present
invention.
[0016] FIG. 2 illustrates a method for controlling regenerative
braking according to a second exemplary embodiment of the present
invention.
[0017] FIG. 3 illustrates a method for controlling regenerative
braking according to a third exemplary embodiment of the present
invention.
[0018] FIG. 4 is a flowchart illustrating a method for controlling
regenerative braking according to the first embodiment of the
present invention.
[0019] FIG. 5 is a flowchart illustrating a method for controlling
regenerative braking according to the second and third embodiments
of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] Hereinafter, a method for controlling regenerative braking
of electric vehicle according to embodiments of the present
invention will be described with reference to the drawings.
[0021] Referring to FIGS. 1 and 4, in a first exemplary embodiment,
the present invention controls regenerative braking torque at the
beginning of ABS control, to promote energy recovery while reducing
the regenerative braking torque gradually if the slip amount of a
wheel is increasing before the initiation of ABS actuating.
[0022] The regenerative braking torque is reduced until the vehicle
stops during ABS actuating if the slip amount of a front wheel is
larger than a standard value, improving the feeling of braking and
energy recovery.
[0023] Hydraulic braking is also used during the ABS actuating.
[0024] Referring to FIGS. 2 and 5, in a second embodiment, if the
slip amount is increased before actuating the ABS, the actuating
signal is transferred to the motor by the controller of the
regenerative braking and the regenerative braking torque is not
reduced.
[0025] Here, if the amount of front wheel slip is larger than the
standard value, at the same time of initiating the ABS actuating,
the regenerative braking torque is reduced until vehicle stop.
[0026] Meanwhile, the hydraulic braking torque is reduced when the
needed decrement of braking torque is larger than the decrement of
the regenerative braking torque.
[0027] Referring to FIG. 3, a third exemplary embodiment differs
from the second embodiment in that the needed decrement of braking
torque is primarily reduced from the hydraulic braking torque,
without reducing the regenerative braking torque, and the
regenerative braking torque is reduced when the needed decrement of
braking torque is larger than the decrement of hydraulic braking
torque.
[0028] While this invention has been described in connection with
what is presently considered to be practical exemplary embodiments,
it is to be understood that the invention is not limited to the
disclosed embodiments, but, on the contrary, is intended to cover
various modifications and equivalent arrangements included within
the spirit and scope of the appended claims.
* * * * *