U.S. patent application number 16/013080 was filed with the patent office on 2019-06-20 for method for controlling mild hybrid vehicle.
This patent application is currently assigned to Hundai Motor Company. The applicant listed for this patent is Hyundal Motor Company, Kia Motors Corporation. Invention is credited to Hwa Yong JANG.
Application Number | 20190184968 16/013080 |
Document ID | / |
Family ID | 66675005 |
Filed Date | 2019-06-20 |
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United States Patent
Application |
20190184968 |
Kind Code |
A1 |
JANG; Hwa Yong |
June 20, 2019 |
METHOD FOR CONTROLLING MILD HYBRID VEHICLE
Abstract
A method for controlling a mild hybrid vehicle may include
determining, by a controller, whether an engine of the mild hybrid
vehicle operates based on a demand torque of a driver of the mild
hybrid vehicle; determining, by the controller, a torque of a
starter-generator of the mild hybrid vehicle that assists a torque
of the engine according to the demand torque of the driver based on
a temperature of a turbocharger of the mild hybrid vehicle when the
engine is operated; and operating, by the controller, the
starter-generator to assist the torque of the engine based on the
determined torque of the starter-generator.
Inventors: |
JANG; Hwa Yong;
(Hwaseong-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hyundal Motor Company
Kia Motors Corporation |
Seoul
Seoul |
|
KR
KR |
|
|
Assignee: |
Hundai Motor Company
Seoul
KR
Kia Motors Corporation
Seoul
KR
|
Family ID: |
66675005 |
Appl. No.: |
16/013080 |
Filed: |
June 20, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60W 2510/0633 20130101;
B60W 2510/0676 20130101; B60W 2540/10 20130101; B60K 6/26 20130101;
B60W 2710/0627 20130101; B60W 2710/0666 20130101; B60W 2510/244
20130101; B60K 6/24 20130101; B60W 10/06 20130101; B60K 2006/268
20130101; B60W 2710/083 20130101; B60Y 2400/435 20130101; B60W
30/1843 20130101; B60W 10/08 20130101; B60K 6/485 20130101; B60W
2510/068 20130101; B60W 2510/0657 20130101; B60W 2050/0045
20130101; B60W 20/10 20130101 |
International
Class: |
B60W 20/10 20060101
B60W020/10; B60K 6/485 20060101 B60K006/485; B60K 6/26 20060101
B60K006/26 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 18, 2017 |
KR |
10-2017-0174094 |
Claims
1. A method for controlling a mild hybrid vehicle, the method
comprising: determining, by a controller, whether an engine of the
mild hybrid vehicle operates based on a demand torque of a driver
of the mild hybrid vehicle; determining, by the controller, a
torque of a starter-generator of the mild hybrid vehicle that
assists a torque of the engine according to the demand torque of
the driver based on a temperature of a turbocharger of the mild
hybrid vehicle when the engine is operated; and operating, by the
controller, the starter-generator to assist the torque of the
engine based on the determined torque of the starter-generator.
2. The method of claim 1, wherein the torque of the
starter-generator increases when the temperature of the
turbocharger is increased.
3. The method of claim 1, wherein the determining of the torque of
the starter-generator includes: determining, by the controller,
whether a state of charge (SOC) value of a battery that supplies
electric power to the starter-generator exceeds a reference value
after receiving the temperature of the turbocharger, wherein the
controller is configured to determine the torque of the
starter-generator when the SOC value of the battery is determined
by the controller to exceed the reference value.
4. The method of claim 3, wherein, when the SOC value of the
battery is determined by the controller to be less than or equal to
the reference value, the controller is configured to determine that
the starter-generator does not assist the torque of the engine and
is configured to control the engine to generate a torque
corresponding to the demand torque of the driver.
5. The method of claim 3, wherein, when the temperature of the
turbocharger is determined by the controller to exceed a
temperature at which the turbocharger is burned and the SOC value
of the battery is determined by the controller to be less than or
equal to the reference value, the controller is configured to
prohibit fuel injection to the engine for an operation of the
engine to stop the operation of the engine.
6. The method of claim 1, wherein the determining of the torque of
the starter-generator includes: determining, by the controller,
whether a state of charge (SOC) value of a battery that supplies
electric power to the starter-generator exceeds a reference value
after receiving the temperature of the turbocharger and having
determined that the received temperature is within a predetermined
range, wherein the controller is configured to determine the torque
of the starter-generator when the controller determines that the
SOC value of the battery exceeds the reference value.
7. The method of claim 6, wherein, when the SOC value of the
battery is determined by the controller to be is less than or equal
to the reference value, the controller is configured to determine
that the starter-generator does not assist the torque of the engine
and is configured to control the engine to generate a torque
corresponding to the demand torque of the driver.
8. The method of claim 7, wherein, when the temperature of the
turbocharger exceeds a maximum value of the predetermined range,
the maximum value at which the turbocharger is burned, and when the
SOC value of the battery is determined by the controller to be is
less than or equal to the reference value, the controller is
configured to prohibit fuel injection to the engine for an
operation of the engine to stop the operation of the engine.
9. The method of claim 1, further including: confirming, by the
controller, that a vehicle including the starter-generator is the
mild hybrid vehicle when the controller receives a signal
corresponding to a first controller area network identification
from the starter-generator to which the first controller area
network identification is assigned.
10. The method of claim 9, further including: confirming, by the
controller, that the vehicle including the starter-generator is the
mild hybrid vehicle including the turbocharger when the controller
receives a signal corresponding to a second controller area network
identification from the turbocharger to which the second controller
area network identification is assigned.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority to Korean Patent
Application No. 10-2017-0174094 filed on Dec. 18, 2017, the entire
contents of which is incorporated herein for all purposes by this
reference.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to a mild hybrid vehicle (or a
mild hybrid electric vehicle), and more particularly, to a method
for controlling a mild hybrid vehicle.
Description of Related Art
[0003] A hybrid electric vehicle utilizes both an internal
combustion engine and a battery power source. The hybrid electric
vehicle efficiently combines the torque of the internal combustion
engine and the torque of a motor.
[0004] Hybrid electric vehicles may be categorized as either a hard
type or a mild type according to a power sharing ratio between the
engine and the motor. In the case of the mild type of hybrid
electric vehicle (or a mild hybrid electric vehicle), a mild hybrid
starter & generator (MHSG) configured to start the engine or
generate electricity according to an output of the engine is used
instead of an alternator. In the case of the hard type of hybrid
electric vehicle, a driving motor configured for generating driving
torque is used in addition to an integrated starter & generator
(ISG) configured to start the engine or generate electricity.
[0005] The mild hybrid electric vehicle does not provide a driving
mode in which torque of the MHSG is used for the main driving
torque, but the MHSG may assist the torque of the engine according
to the running state of the vehicle and may charge a battery (e.g.,
a 48 V battery) through regenerative braking. Accordingly, the fuel
efficiency of the mild hybrid electric vehicle may be improved.
[0006] A vehicle may use a turbocharger to increase output of an
engine without increasing volume of the engine. An exhaust gas
rotates a turbine wheel of the turbocharger and a wheel of an air
compressor connected to a shaft which is connected to the turbine
wheel is rotated to provide a compressed air into the combustion
chamber so that the turbocharger increases the output of the
engine.
[0007] The information disclosed in this Background of the
Invention section is only for enhancement of understanding of the
general background of the invention and may not be taken as an
acknowledgement or any form of suggestion that this information
forms the prior art already known to a person skilled in the
art.
BRIEF SUMMARY
[0008] Various aspects of the present invention are directed to
providing a method for controlling a mild hybrid vehicle which is
configured for maintaining or reducing fuel injection and assisting
torque of an engine by operating a starter-generator when
temperature of a turbocharger exceeds a reference value because of
continuous fuel injection for operating the engine.
[0009] An exemplary embodiment of the present invention may provide
the method for controlling the mild hybrid vehicle, including:
determining, by a controller, whether an engine of the mild hybrid
vehicle operates based on a demand torque of a driver of the mild
hybrid vehicle; determining, by the controller, a torque of a
starter-generator of the mild hybrid vehicle that assists a torque
of the engine according to the demand torque of the driver based on
a temperature of a turbocharger of the mild hybrid vehicle when the
engine is operated; and operating, by the controller, the
starter-generator to assist the torque of the engine based on the
determined torque of the starter-generator.
[0010] The torque of the starter-generator may increase when the
temperature of the turbocharger is increased.
[0011] The determining of the torque of the starter-generator may
include: determining, by the controller, whether a state of charge
(SOC) value of a battery that supplies electric power to the
starter-generator exceeds a reference value after receiving the
temperature of the turbocharger. The controller may be configured
to determine the torque of the starter-generator when it is
determined that the SOC value of the battery exceeds the reference
value.
[0012] The controller may be configured to determine that the
starter-generator does not assist the torque of the engine and may
control the engine to generate a torque corresponding to the demand
torque of the driver when it is determined that the SOC value of
the battery is less than or equal to the reference value.
[0013] The controller may prohibit fuel injection for an operation
of the engine to stop the operation of the engine when the
temperature of the turbocharger exceeds a temperature at which the
turbocharger is burned and it is determined that the SOC value of
the battery is less than or equal to the reference value.
[0014] The method for controlling the mild hybrid vehicle may
further include: confirming, by the controller, that a vehicle
including the starter-generator is the mild hybrid vehicle when the
controller receives a signal corresponding to a first controller
area network identification from the starter-generator to which the
first controller area network identification is assigned.
[0015] The method for controlling the mild hybrid vehicle may
further include: confirming, by the controller, that the vehicle
including the starter-generator is the mild hybrid vehicle
including the turbocharger when the controller receives a signal
corresponding to a second controller area network identification
from the turbocharger to which the second controller area network
identification is assigned.
[0016] The method for controlling the mild hybrid vehicle according
to the exemplary embodiment of the present invention may not limit
demand torque of the driver of the vehicle using the engine torque
assist by the starter-generator when temperature of an exhaust gas
excessively rises due to the engine operation in the vehicle
including the starter-generator.
[0017] Furthermore, the exemplary embodiment of the present
invention may prevent overheating of the exhaust gas in advance
using the engine torque assist by the starter-generator which is
performed from a time when a temperature rise in the turbocharger
due to the exhaust gas is detected. When a temperature of the
turbocharger exceeds a temperature at which the turbocharger is
burnt or damaged due to the exhaust gas according to the engine
operation, the exemplary embodiment of the present invention may
satisfy the driver's demand torque by assisting the engine torque
using a maximum output of the starter-generator.
[0018] The methods and apparatuses of the present invention have
other features and advantages which will be apparent from or are
set forth in more detail in the accompanying drawings, which are
incorporated herein, and the following Detailed Description, which
together serve to explain certain principles of the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a flowchart illustrating a method for controlling
a mild hybrid vehicle according to an exemplary embodiment of the
present invention.
[0020] FIG. 2 is a view for explaining a step of confirming whether
a turbocharger is applied to the vehicle which is shown in FIG.
1.
[0021] FIG. 3 and FIG. 4 are views illustrating a step of assisting
an engine torque which is shown in FIG. 1.
[0022] FIG. 5 is a block diagram illustrating a mild hybrid vehicle
to which the method for controlling the mild hybrid vehicle shown
in FIG. 1 is applied.
[0023] It may be understood that the appended drawings are not
necessarily to scale, presenting a somewhat simplified
representation of various features illustrative of the basic
principles of the invention. The specific design features of the
present invention as disclosed herein, including, for example,
specific dimensions, orientations, locations, and shapes will be
determined in part by the particularly intended application and use
environment.
[0024] In the figures, reference numbers refer to the same or
equivalent parts of the present invention throughout the several
figures of the drawing.
DETAILED DESCRIPTION
[0025] Reference will now be made in detail to various embodiments
of the present invention(s), examples of which are illustrated in
the accompanying drawings and described below. While the
invention(s) will be described in conjunction with exemplary
embodiments, it will be understood that the present description is
not intended to limit the invention(s) to those exemplary
embodiments. On the contrary, the invention(s) is/are intended to
cover not only the exemplary embodiments, but also various
alternatives, modifications, equivalents and other embodiments,
which may be included within the spirit and scope of the invention
as defined by the appended claims.
[0026] In order to sufficiently understand the present invention
and the object achieved by embodying the present invention, the
accompanying drawings illustrating exemplary embodiments of the
present invention and contents described in the accompanying
drawings are to be referenced.
[0027] Hereinafter, the present invention will be described in
detail by describing exemplary embodiments of the present invention
with reference to the accompanying drawings. In describing the
present invention, well-known configurations or functions will be
omitted in detail since they may unnecessarily obscure the gist of
the present invention. Throughout the accompanying drawings, the
same reference numerals will be used to denote the same
components.
[0028] Terms used in the present specification are only used in
order to describe specific exemplary embodiments rather than
limiting the present invention. Singular forms are to include
plural forms unless the context clearly indicates otherwise. It
will be further understood that the terms "include" or "have" used
in the present specification specify the presence of features,
numerals, steps, operations, components, or parts mentioned in the
present specification, or a combination thereof, but do not
preclude the presence or addition of one or more other features,
numerals, steps, operations, components, parts, or a combination
thereof.
[0029] Throughout this specification and the claims that follow,
when it is described that an element is "coupled" to another
element, the element may be "directly coupled" to the other element
or "electrically or mechanically coupled" to the other element
through a third element.
[0030] Unless defined otherwise, it is to be understood that the
terms used in specification including technical and scientific
terms have the same meanings as those that are generally understood
by those skilled in the art. It must be understood that the terms
defined by the dictionary are identical with the meanings within
the context of the related art, and they should not be ideally or
excessively formally defined unless the context clearly dictates
otherwise.
[0031] A turbocharger is a system that utilizes an exhaust gas to
drive a compressor and supercharges air into an intake port or an
intake manifold, and is a device that requires high temperature
thermal management. The exhaust gas may rotate an internal vane of
the turbocharger to supply compressed air to an engine, which is a
power source, but the turbocharger hardware may be burned out due
to a high temperature exhaust gas.
[0032] A related art performs a torque limit of the engine when a
temperature of the turbocharger exceeds a temperature upper limit
so that an injection amount of fuel is further increased or a fuel
amount is reduced to lower a temperature of the turbocharger.
Therefore, even though a driver's demand torque is great,
additional torque may not be increased to protect the turbocharger.
In more detail, the related art may reduce the exhaust gas
temperature by restricting the engine output to prevent the
hardware burnout of the turbocharger when the temperature of the
turbocharger excessively rises.
[0033] FIG. 1 is a flowchart illustrating a method for controlling
a mild hybrid vehicle according to an exemplary embodiment of the
present invention. FIG. 2 is a view for explaining a step of
confirming whether a turbocharger is applied to the vehicle which
is shown in FIG. 1. FIG. 3 and FIG. 4 are views illustrating a step
of assisting an engine torque which is shown in FIG. 1. FIG. 5 is a
block diagram illustrating a mild hybrid vehicle to which the
method for controlling the mild hybrid vehicle shown in FIG. 1 is
applied.
[0034] Referring to FIG. 1 to FIG. 5, in a confirmation step 105, a
controller 200 may confirm or determine whether the vehicle is a
mild hybrid vehicle. The controller 200 may be connected to a
starter-generator (e.g., a mild hybrid starter and generator
(MHSG)) 30 via a controller area network (CAN) which is a vehicle
network. Accordingly, when the controller 80 receives a signal
corresponding to an inherent CAN identification (ID) from the
starter-generator 30 to which the inherent CAN ID which is a first
CAN ID is assigned, the controller 80 may confirm that the vehicle
to be controlled is the mild hybrid vehicle.
[0035] The controller 200 may control an overall operation of the
mild hybrid vehicle. For example, the controller 200 such as an
engine control unit (ECU) may be one or more microprocessors
operated by a program or hardware including the microprocessor. The
program may include a series of commands for executing the method
for controlling the mild hybrid vehicle according to the exemplary
embodiment of the present invention. The commands may be stored in
a memory.
[0036] The mild hybrid vehicle includes an engine 205, a
transmission 20, the starter-generator (or a mild hybrid starter
and generator) 30, a battery 40, a differential gear device 50,
wheels 60, the controller 200, and the turbocharger shown in FIG.
2.
[0037] The engine 205 may convert chemical energy to mechanical
energy by combusting fuel and air. Torque of the engine 205 may be
transmitted to an input shaft of the transmission 20, and a torque
output from an output shaft of the transmission may be transmitted
to an axle of the vehicle via the differential gear device 50. The
axle may rotate the wheels 60 so that the mild hybrid vehicle may
be driven.
[0038] The starter-generator 30 may convert electrical energy to
mechanical energy or mechanical energy to electrical energy. In
other words, the starter-generator 30 may start the engine 205 or
generate electricity according to an output of the engine 205.
Furthermore, the starter-generator 30 may assist the torque of the
engine 205. The mild hybrid vehicle may use the torque of the
starter-generator 30 as an auxiliary power while combustion torque
of the engine 205 is a main power. The engine 205 and the
starter-generator 30 may be connected via the belt 32 (or a pulley
and a belt).
[0039] In the mild hybrid vehicle, the starter-generator 30 may be
a portion performing functions of an alternator, the engine torque
assist, or regenerative braking.
[0040] The starter-generator 30 may drive the engine 205 of the
vehicle in a cranking and a torque control mode of the vehicle (or
the engine) and may generate electricity according to an output of
the engine to charge the 48 V battery 40 using an inverter in an
electricity generation mode of the vehicle. The starter-generator
30 may operate in an operating mode in accordance with a driving
state of the vehicle. The operating mode may include an engine
starting mode, an engine torque assist mode for assisting torque of
the engine by operating as a motor, a mode for charging the 48 V
battery charging the 12 V battery which is connected to the 48 V
battery via the LDC, a regenerative braking mode for charging the
48 V battery, or an inertial driving mode for extending a mileage
of the vehicle. The starter-generator 30 may be optimally
controlled according to the driving state of the vehicle to
increase fuel efficiency of the vehicle.
[0041] The battery 40 may supply electricity to the
starter-generator 30 or may be charged by electricity collected
through the starter-generator 30 in a regenerative braking mode of
the vehicle. The battery 40 may be a 48 V battery. The mild hybrid
vehicle may further include a low voltage DC-DC converter (LDC)
that converts voltage supplied from the battery 40 to a low voltage
and a 12 V battery that supplies the low voltage to an electric
load of the vehicle.
[0042] According to a confirmation step 110, the controller 200 may
confirm or determine whether the turbocharger shown in FIG. 2 is
disposed in the vehicle. In FIG. 2, a reference numeral 34
indicates a camshaft included in an auxiliary machinery of the
engine 205 and a reference numeral 36 indicates a crankshaft
included in the auxiliary machinery of the engine.
[0043] The controller 200 may be connected to the turbocharger via
the CAN. Accordingly, when the controller 80 receives a signal
corresponding to an inherent CAN ID from the turbocharger to which
the inherent CAN ID which is a second CAN ID is assigned, the
controller 80 may confirm that the vehicle to be controlled is the
mild hybrid vehicle including the turbocharger.
[0044] In another exemplary embodiment of the present invention,
the confirmation step 105 and the confirmation step 110 may be
omitted.
[0045] According to a determination step 115, the controller 200
may determine whether the engine 205 of the mild hybrid vehicle
operates or runs according to a demand torque of a driver of the
mild hybrid vehicle. For example, whether the engine 205 is
operated may be detected by an engine operation sensor disposed in
the engine and may be provided to the controller 200.
[0046] According to a step 120, the controller 200 may recognize or
receive a temperature of the turbocharger when it is determined
that the engine 205 is operated in the determination step 115. For
example, the temperature of the turbocharger may be detected by a
temperature sensor disposed in the turbocharger and may be provided
to the controller 200.
[0047] According to a step 125, the controller 200 may confirm that
the temperature of the turbocharger is equal to or greater than a
first temperature Temp1 and equal to or less than a second
temperature Temp2 due to an exhaust gas according to the engine
operation. For example, as shown in FIG. 3 and FIG. 4, a range
between the first temperature Temp1 and the second temperature
Temp2 may correspond to a temperature range when the engine 205
takes charge of 90% of the driver's demand torque and the
starter-generator 30 takes charge of 10% of the driver's demand
torque. The range between the first temperature Temp1 and the
second temperature Temp2 may be determined by a test to be stored
in a memory.
[0048] According to a determination step 145, the controller 200
may determine whether a state of charge (SOC) value of the battery
40 that supplies electric power to the starter-generator 30 exceeds
a reference value after receiving the temperature of the
turbocharger.
[0049] According to a step 150, when it is determined that the SOC
value of the battery 40 is equal to or less than the reference
value, the controller 200 may determine that the starter-generator
30 does not assist a torque of the engine 205 and may control or
adjust the torque of the engine to satisfy the required torque of
the driver.
[0050] According to a step 155, when it is determined that the SOC
value of the battery 40 exceeds the reference value, the controller
200 may determine a torque of the starter-generator 30 for
assisting a torque of the engine 205 according to the driver's
demand torque, and the controller 200 may operate the
starter-generator 30 to assist the torque of the engine 205 based
on the determined torque of the starter-generator.
[0051] According to a step 130, the controller 200 may confirm that
the temperature of the turbocharger is equal to or greater than the
second temperature Temp2 and equal to or less than a third
temperature Temp3 due to an exhaust gas according to the engine
operation. For example, as shown in FIG. 3 and FIG. 4, a range
between the second temperature Temp2 and the third temperature
Temp3 may correspond to a temperature range when the engine 205
takes charge of 70% to 90% of the driver's demand torque and the
starter-generator 30 takes charge of 10% to 30% of the driver's
demand torque. The range between the second temperature Temp2 and
the third temperature Temp3 may be determined by a test to be
stored in the memory.
[0052] According to a determination step 160, the controller 200
may determine whether a state of charge (SOC) value of the battery
40 that supplies electric power to the starter-generator 30 exceeds
the reference value after receiving the temperature of the
turbocharger.
[0053] According to a step 165, when it is determined that the SOC
value of the battery 40 is equal to or less than the reference
value, the controller 200 may determine that the starter-generator
30 does not assist a torque of the engine 205 and may control or
adjust the torque of the engine to satisfy the required torque of
the driver.
[0054] According to a step 170, when it is determined that the SOC
value of the battery 40 exceeds the reference value, the controller
200 may determine a torque of the starter-generator 30 for
assisting a torque of the engine 205 according to the driver's
demand torque, and the controller 200 may operate the
starter-generator 30 to assist the torque of the engine 205 based
on the determined torque of the starter-generator.
[0055] According to a step 135, the controller 200 may confirm that
the temperature of the turbocharger is equal to or greater than the
third temperature Temp3 and equal to or less than a turbocharger
hardware protection temperature Tmax due to an exhaust gas
according to the engine operation. The turbocharger hardware
protection temperature Tmax may refer to a temperature at which the
turbocharger is overheated by an exhaust gas according to the
engine operation so that the turbocharger is be burned (or
damaged). For example, as shown in FIG. 3 and FIG. 4, a range
between the third temperature Temp3 and the turbocharger hardware
protection temperature Tmax may correspond to a temperature range
when the engine 205 takes charge of 40% to 70% of the driver's
demand torque and the starter-generator 30 takes charge of 30% to
60% of the driver's demand torque. The range between the third
temperature Temp3 and the turbocharger hardware protection
temperature Tmax may be determined by a test to be stored in the
memory.
[0056] According to a determination step 175, the controller 200
may determine whether a state of charge (SOC) value of the battery
40 exceeds the reference value after receiving the temperature of
the turbocharger.
[0057] According to a step 180, when it is determined that the SOC
value of the battery 40 is equal to or less than the reference
value, the controller 200 may determine that the starter-generator
30 does not assist a torque of the engine 205 and may control or
adjust the torque of the engine to satisfy the required torque of
the driver.
[0058] According to a step 185, when it is determined that the SOC
value of the battery 40 exceeds the reference value, the controller
200 may determine a torque of the starter-generator 30 for
assisting a torque of the engine 205 according to the driver's
demand torque, and the controller 200 may operate the
starter-generator 30 to assist the torque of the engine 205 based
on the determined torque of the starter-generator.
[0059] According to a step 140, the controller 200 may confirm that
the temperature of the turbocharger exceeds the turbocharger
hardware protection temperature Tmax due to an exhaust gas
according to the engine operation. For example, as shown in FIG. 3
and FIG. 4, a range of temperatures exceeding the turbocharger
hardware protection temperature Tmax may correspond to a
temperature range when the engine 205 takes charge of 0% of the
driver's demand torque (i.e., the engine 205 is not responsible for
the driver's demand torque) and the starter-generator 30 takes
charge of 100% of the driver's demand torque. The range of
temperatures exceeding the turbocharger hardware protection
temperature Tmax may be determined by a test to be stored in the
memory.
[0060] According to a determination step 190, the controller 200
may determine whether a state of charge (SOC) value of the battery
40 exceeds the reference value after receiving the temperature of
the turbocharger.
[0061] According to a step 192, when it is determined that the SOC
value of the battery 40 is less than or equal to the reference
value, the controller 200 may determine that the starter-generator
30 does not assist the torque of the engine 205 so that the
controller is configured to prohibit fuel injection for operating
the engine to stop an operation of the engine.
[0062] In another exemplary embodiment of the step 192, the
controller 200 may determine that the starter-generator 30 does not
assist a torque of the engine 205 so that the controller limits an
injection amount of fuel for operation of the engine to prevent
temperature rise of the turbocharger.
[0063] According to a step 194, when it is determined that the SOC
value of the battery 40 exceeds the reference value, the controller
200 may determine a torque (e.g., a maximum torque) of the
starter-generator 30 for assisting a torque of the engine 205
according to the driver's demand torque, and the controller 200 may
operate the starter-generator 30 to assist the torque of the engine
205 based on the determined torque of the starter-generator.
[0064] Referring to FIG. 3 and FIG. 4, when a temperature of the
turbocharger is increased, a torque of the starter-generator 30 may
increase.
[0065] The components, ".about. unit", block, or module which are
used in the present exemplary embodiment of the present invention
may be implemented in software such as a task, a class, a
subroutine, a process, an object, an execution thread, or a program
which is performed in a predetermined region in the memory, or
hardware such as a field programmable gate array (FPGA) or an
application-specific integrated circuit (ASIC), and may be
performed with a combination of the software and the hardware. The
components, `.about.part`, or the like may be embedded in a
computer-readable storage medium, and some part thereof may be
dispersedly distributed in a plurality of computers.
[0066] For convenience in explanation and accurate definition in
the appended claims, the terms "upper", "lower", "inner", "outer",
"up", "down", "upper", "lower", "upwards", "downwards", "front",
"rear", "back", "inside", "outside", "inwardly", "outwardly",
"internal", "external", "inner", "outer", "forwards", and
"backwards" are used to describe features of the exemplary
embodiments with reference to the positions of such features as
displayed in the figures.
[0067] The foregoing descriptions of specific exemplary embodiments
of the present invention have been presented for purposes of
illustration and description. They are not intended to be
exhaustive or to limit the invention to the precise forms
disclosed, and obviously many modifications and variations are
possible in light of the above teachings. The exemplary embodiments
were chosen and described to explain certain principles of the
invention and their practical application, to enable others skilled
in the art to make and utilize various exemplary embodiments of the
present invention, as well as various alternatives and
modifications thereof. It is intended that the scope of the
invention be defined by the Claims appended hereto and their
equivalents.
* * * * *