NZ627799B - DPF system for an engine generator - Google Patents
DPF system for an engine generatorInfo
- Publication number
- NZ627799B NZ627799B NZ627799A NZ62779914A NZ627799B NZ 627799 B NZ627799 B NZ 627799B NZ 627799 A NZ627799 A NZ 627799A NZ 62779914 A NZ62779914 A NZ 62779914A NZ 627799 B NZ627799 B NZ 627799B
- Authority
- NZ
- New Zealand
- Prior art keywords
- temperature
- amount
- engine
- recovery
- generator
- Prior art date
Links
- 238000011084 recovery Methods 0.000 claims abstract description 139
- 239000000446 fuel Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract 3
- 150000002500 ions Chemical class 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 description 33
- 201000009582 Pelizaeus-Merzbacher disease Diseases 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910002089 NOx Inorganic materials 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/10—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for stationary applications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0234—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using heat exchange means in the exhaust line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D2041/026—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus using an external load, e.g. by increasing generator load or by changing the gear ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
DPF system for an engine generator (E, G) that performs a recovery process on a filter (DPF) is disclosed. The system is provided to remove particulate matter generated by combustion of fuel when an amount of the particulate matter in the DPF exceeds a predetermined value. The engine generator (E, G) performing the recovery process by carrying out an automatic recovery operation to raise a temperature of exhaust gas to combust the particulate matter. The system comprising: a dummy load (L) connected to the engine generator when necessary; and control device (ECU) for allowing the engine to perform a recovery preparation operation in such a manner that, once the amount of the particulate matter exceeds the predetermined value. The recovery operation is performed when the temperature of exhaust gas reaches a reference temperature, and the dummy load is connected to the generator to raise the temperature of exhaust gas when the temperature thereof fails to reach the reference temperature. G) performing the recovery process by carrying out an automatic recovery operation to raise a temperature of exhaust gas to combust the particulate matter. The system comprising: a dummy load (L) connected to the engine generator when necessary; and control device (ECU) for allowing the engine to perform a recovery preparation operation in such a manner that, once the amount of the particulate matter exceeds the predetermined value. The recovery operation is performed when the temperature of exhaust gas reaches a reference temperature, and the dummy load is connected to the generator to raise the temperature of exhaust gas when the temperature thereof fails to reach the reference temperature.
Description
DPF SYSTEM FOR AN ENGINE GENERATOR
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to an exhaust gas
treatment filter for an engine generator, and in ular, to a
system that removes particulate matter (PM) generated by
operation of a diesel engine for a generator and accumulated in
a Diesel Particulate Filter (DPF) to recover the DPF.
d Art
A diesel engine tes particulate matter in addition
to NOx as a result of fuel combustion in nature. To t the
particulate matter from being emitted into the atmosphere, an
increasing number of diesel engines are equipped with a DPF to
collect particulate matter (PM) contained in exhaust gas. This
also applies to —driven generators.
In an engine-driven generator equipped with a DPF, a
generator G is driven by a diesel engine E, electric power is
supplied to a load (not shown in the drawings) through an
output terminal OUT, and exhaust gas from the diesel engine E
is emitted into the atmosphere through the DPF, as shown in
However, the ,DPF is limited in terms of the amount of PM
collected, and thus, once a certain amount of particulate matter
is accumulated, the particulate matter needs to be removed by,
for example, being burned by a certain method, to recover the
DPF. For recovery of the DPF, the amount of the particulate
matter and the temperature of the exhaust gas are measured
and the engine E is controlled to burn the particulate matter.
That is, ulate matter amount measuring device PMD
provided in the DPF' measures the amount of the particulate
matter, and ature detecting device TD es the
exhaust gas temperature. Based on the results of
measurements by the measuring device, an engine control unit
ECU transmits and receives signals to and from the engine E to
control the engine E. Thus, the particulate matter is burned in
a timely manner to recover the DPF.
Furthermore, another method for recovering the DPF is to
burn the particulate matter using an electric heater incorporated
in the DPF (see Japanese Patent Laid-Open No. 2009-216075).
The recovery of the DPF as bed above allows an
engine generator using a diesel engine to be uously
operated. A failure to appropriately recover the DPF causes a
large amount of particulate matter to be accumulated. This
leads to a very disadvantageous situation that involves the
shutdown of the generator and manual removal of the
ulate matter in the DPF.
To recover the DPF, in other words, to burn the
particulate matter, the exhaust gas needs to be hot above a
certain temperature. In this case, what should be taken into
account is that the installed engine tor typically has a
capacity about three times as large as a rated input power for a
load so as to be able to deal with, for example, starting of an
electric motor when a large starting current flows rapidly.
Thus, in a steady state, the engine is operated under a
light load, and the exhaust gas temperature remains low.
Since the generator serves as a load on the engine, the engine
is to be operated at a constant speed. Consequently, such
method of increasing the speed in order to raise the exhaust
gas temperature as is the case with automobiles cannot be
adopted.
Therefore, the ry of the DPF in the engine
tor may involve a technique for burning the particulate
matter using such a heater as illustrated in Japanese Patent
3O Laid-Open No. 2009—216075.
However, providing a heater in order to burn the
particulate matter is not always satisfactory from the int
of fuel efficiency. Furthermore, a special DPF incorporating the
heater is not preferable. d of the special DPF, a
general—purpose DPF (for example, a DPF for automobiles) is
desirably used, but adopting the general—purpose DPF for the
engine generator is opriate as described above.
With the foregoing in view, it is an object of the present
invention to provide a DPF system for an engine generator
which prevents particulate matter from being accumulated
without stopping power supply and which allows the DPF to be
recovered in a fuel efficient manner. Alternatively, it is an
object of the present invention to at least provide the public
with a useful choice.
SUMMARY OF THE INVENTION
To accomplish any one of these objects, the present
ion es:
A Diesel Particulate Filter (DPF) recovery system for an
engine which drives a tor, having a particulate matter
amount measuring device which detects the amount of
ulate matter attached to the DPF, and a temperature
measuring device which s the temperature of the exhaust
gas of the engine so as to carry out a recovery process of the
DPF to remove particulate matter generated by combustion of
fuel for the engine when an amount of the particulate matter
attached to the DPF exceeds a predetermined value, by
performing an automatic recovery operation to raise a
temperature of the exhaust gas so as to burn the particulate
matter, the DPF recovery system sing:
a dummy load to be connectable to the generator; and
a control device, including an engine control unit and an
engine controlling additional unit, for allowing the engine to
m the automatic recovery operation by cooperation of the
engine control unit and the engine controlling additional unit
according to the detected signals from the particulate matter
amount measuring device and from the temperature measuring
device;
wherein the control device operates the engine in such a
manner that, when the amount of the particulate matter
s the predetermined value, it immediately allows the
automatic recovery operation when the temperature of the
(followed by page 3a)
exhaust gas reaches an tic recovery reference
temperature, and it connects the dummy load to the generator
when the temperature of the exhaust gas does not reach the
automatic ry nce temperature to raise the
temperature of the exhaust gas so as to carry out the automatic
recovery operation;
wherein the control device further comprises: a first
timer for g a retention time which is required for raising
the temperature of the exhaust gas to reach the automatic
recovery ion reference since connecting the dummy load,
wherein the control device
judges whether the temperature of the exhaust gas
exceeds the automatic recovery reference temperature,
carries out a recovery process immediately when the
ature of the exhaust gas exceeds the tic recovery
reference ature,
ts the dummy load to the generator when the
temperature of the exhaust gas does not exceed the automatic
recovery reference temperature,
judges whether the temperature of the exhaust gas
exceeds the automatic recovery reference temperature after the
retention time of the first timer has passed,
carries out the automatic recovery operation when the
temperature of the exhaust gas exceeds the automatic recovery
reference temperature,
cuts off the dummy load when the temperature of the
exhaust gas does not exceed the automatic recovery reference
temperature, and
judges whether the amount of particulate matter exceeds
a manual recovery reference amount,
so as to generate a manual recovery request if the
amount of the particulate matter s the manual recovery
reference, or to carry out a normal operation of the engine if
the amount of the ulate matter does not exceed the same.
As described above, according to the present invention,
when the amount of particulate matter in the engine increases,
the dummy load is connected to the generator based on the
(followed by page 4)
exhaust gas temperature to raise the exhaust gas temperature.
Thus, the particulate matter is burned to recover the DPF. This
prevents an excessive amount of particulate matter from being
accumulated and furthermore allows provision of a DPF system
for an engine generator which has high fuel ency. As a
result, the engine generator can be operated without bringing
about a ion in which power supply is stopped and in which
the DPF is then recovered.
Unless the context clearly requires otherwise, throughout
the ption and claims the terms “comprise”, “comprising” and
the like are to be construed in an inclusive sense, as opposed to an
exclusive or tive sense. That is, in the sense of “including,
but not limited to”.
BRIEF DESCRIPTION OF THE DRAWINGS
is a block diagram g a configuration of a
DPF system for an engine generator ing to the present
invention;
is a diagram illustrating a configuration of a DPF
installed in the engine generator;
is a flowchart showing a basic control operation for
recovery of the DPF in the engine generator;
is a flowchart showing a DPF recovery control
operation according to an embodiment of the present invention;
and
is a block diagram showing a configuration of a
DPF system in a conventional engine generator.
DETAILED DESCRIPTION OF THE INVENTION
ments of the present invention will be bed
with reference to the accompanying drawings as follows.
Embodiment 1
is a block diagram showing a configuration of an
embodiment of the present invention. As shown in a
generator G includes a dummy load L and a contactor MC both
(Followed by page 4a)
provided on an output side of the generator G; the contactor MC
applies the dummy load L on the tor G and removes the
dummy load L. The contactor MC is turned on and off to
connect the dummy load L such as a resistor to the generator G
when necessary. The generator G is then operated to increase
power output from the engine E.
Based on s of measurements by particulate matter
amount measuring device PMD and temperature measuring
device TD, the contactor MC is controlled by an engine
(Followed by page 5)
controlling additional unit G—ECU connected to an engine control
unit ECU via a CAN (Controller Area Network). That is, the
engine controlling additional unit G—ECU turns the contactor MC
on and off in ance with engine control performed by the
engine control unit ECU to controllably apply the dummy load L
on the generator G and cuts off the dummy load L.
That is, when necessary, the dummy load L is connected
to the generator G to increase the power output from the engine
E to raise the temperature of exhaust gas. Thus, particulate
matter in a DPF is burned and removed to recover the DPF.
In this case, the engine control unit ECU is, for example,
a control tus attached to an automobile diesel engine E.
The engine controlling additional unit G—ECU is a control
apparatus added in order to control the contactor MC so as to
apply the dummy load L to the engine E and to cut off the
dummy load in accordance with operation of the engine E.
rates the ure of the DPF. The DPF in a
broad sense consists of an oxidation catalyst DOC and a DPF
main body that is the DPF in a narrow sense. The DOC and the
DPF main body integrally operate to treat exhaust gas IN to
generate exhaust gas OUT. Then, the particulate matter
amount measuring device PMD detects the amount of
particulate matter based on, for example, a difference in
re between an input and an output of the DPF.
is a flowchart showing a basic operation of DPF
recovery control in the engine generator shown in that is,
the operation corresponding to a prerequisite for the present
invention. With reference to description will be
provided which relates to a normal operation and a DPF
recovery operation of an engine generator equipped with a DPF
l operation and DPF ry operation of the engine
generator equipped with the DPF system"
First, an operator performs manual operations of starting
the engine E (51), g the engine E to rotate at a rated
speed (82), and applying a load on the generator G (S3).
Thereby, the engine generator performs a normal operation
(S4).
As the engine E is operated, ulate matter is
generated in exhaust gas and lly accumulated in the DPF
(SS). At this time, when the exhaust gas temperature in the
engine E is equal to or higher than a DPF recoverable
temperature at which the DPF can be recovered, in other words,
the temperature at which the particulate matter is burned ($6),
the particulate matter in the DPF is spontaneously burned (S7).
In other words, the DPF is spontaneously recovered while the
engine E continues the normal operation.
On the other hand, when the exhaust gas temperature is
lower than the DPF recoverable temperature, the process
ds to step S8 to determine whether or not the PM amount
is equal to or more than an automatic recovery reference
amount. When the PM amount is less than the automatic
recovery reference amount, the s returns to step S4
where the engine E continues the normal operation.
When it is determined in step 58 that the lated
PM amount is equal to or more than the reference amount, that
is, the PM amount indicates that the DPF is to be recovered, the
process proceeds to step 59 to start automatic recovery if the
exhaust gas temperature is equal to or higher than the
automatic recovery reference temperature (510).
In this case, the automatic recovery reference
temperature refers to a temperature equal to a recoverable
temperature minus a temperature to which the exhaust gas
temperature can be raised by controlling the engine to the
extent that the tor can be used in a manner equivalent to
the manner during the normal ion.
In the automatic ry operation, the engine E is
controlled by the engine control unit ECU to the extent that the
generator G can be used in a manner similar to the manner
during the normal operation, based on the amount of particulate
matter (PM amount) measured by the particulate matter
amount measuring device PMD provided in the engine E and on
the exhaust gas ature measured by the temperature
measuring device TD also provided in the engine E.
Then, the process proceeds to step 511 where the engine
E is controlled to burn the particulate matter in the DPF
(automatic recovery). The engine l 'includes post
injection (fuel injection during piston exhaust) intake restriction
and the like. During the automatic recovery, the engine E is
controlled to the extent that the generator can be used in a
manner equivalent to the manner during the normal operation.
The s ues the automatic recovery until the
PM amount decreases to an automatic recovery end reference
amount, while checking whether or not the exhaust gas
ature is equal to or higher than the automatic recovery
reference temperature (511 —> 512 —> 513 —> $11 —>
. . .). When,
by the automatic recovery, the PM amount decreases below the
automatic recovery end reference amount, the automatic
recovery ends and the engine E returns to the normal operation
(815 —> S4).
On the other hand, during an automatic ry
operation, the load may decrease to lower the exhaust gas
temperature below the automatic recovery reference
temperature. At this time, in other words, when the exhaust
gas temperature falls below the automatic recovery reference
temperature though the PM amount has not decreased to the
automatic recovery end reference (513), the process suspends
the automatic recovery (514) and ds to step 516 to
ine whether or not the PM amount is equal to or more
than the reference amount at which manual recovery is to be
carried out.
When the PM amount is less than the nce amount
at which the manual recovery is to be carried out, the process
returns to step 54 where the engine E is operated in a normal
manner. However, when the PM amount is equal to or more
than the manual recovery reference, the process proceeds to
step 517 to issue a manual recovery request. When the
manual recovery request is issued, the process proceeds to step
518 where the or ms determination and needed
manual operations.
The manual recovery is the last DPF recovery that can be
carried out by the engine control, and the manual recovery
reference for the PM amount is close to a limit amount at which
the DPF can be safely recovered. For the manual recovery, the
power output, the on speed, and the like need to be
adjusted and controlled up to a larger region exceeding the
range of the engine control for the automatic control.
This may preclude the generator from performing a
normal operation, and thus, power supply needs to be stopped.
r, sudden power outage is risky, and the operator's
determination and manual operations are involved in the
process in order to stop power supply with the usage of the load,
the progress of the operation, and the like taken into account.
The recovery in this stage is referred to as the "manual
recovery", but the recovery operation itself is automatically
performed by the engine control apparatus ECU.
First, in step 518, the operator determines whether or
not to accept the manual recovery request. If the operator
accepts the manual recovery request, the process is manually
continued to step 519 where the load on the generator G is cut
off, with the engine E kept in an idling state. Then, the
operator depresses a manual ry button (switch) (520).
Thus, a manual recovery operation is started ($21), and
the engine E is controlled to burn the particulate matter ($22).
The control is performed until the PM amount decreases down to
the manual recovery end nce amount ($23). The control
ends when the PM amount reaches the manual recovery end
3O reference amount (524). The process then returns to step 52.
On the other hand, when the operator determines not to
accept the manual ry t or overlooks the manual
recovery request, the process proceeds to step 525 where the
engine control unit ECU determines whether or not the PM
amount is equal to or more than an ncy stop reference
amount. Then, when the PM amount is less than the
emergency stop reference amount, the process proceeds to step
S4 where the engine E is operated in a normal manner. When
the PM amount has reached the emergency stop reference
, the engine E is brought to an emergency stop (S26)
because the particulate matter may be subjected to abnormal
tion to cause an accident.
"Automatic recovery operation by the DPF system according to
the present invention"
is a flowchart illustrating a recovery operation of
the system according to the present invention which operation
is to be inserted between steps S8 and S17 in instead of
steps S9 to S16 with such expressions as found in activity
diagrams.
The flowchart illustrates the contents of an operation by
steps S101 to S124, and the description below follows this order
of steps.
First, in step S8 in the flowchart in the process
proceeds to step S101 when the PM amount is equal to or more
than the automatic recovery reference amount. Step S101
determines r or not the exhaust gas temperature is equal
to or higher than the automatic recovery nce temperature.
When the exhaust gas temperature is equal to or higher than
the reference temperature, the s proceeds to step S108
to start an automatic recovery ion. When the exhaust
gas temperature is lower than the reference temperature, the
process proceeds to step S102 where the dummy load L is
applied on the generator.
When the dummy load L is applied on the generator, the
control unit ECU for the engine E controls the engine E to
se the amount of fuel injection to maintain a
constant-speed operation. As a result, the exhaust gas
temperature rises, but due to a time delay in the rise of the gas
temperature, the result of the operation of the control apparatus
appears with the time delay. ore, step S103 deals with
the time delay using a timer tion time 1).
That is, when the retention time 1 elapses, determination
is made as to whether or not the exhaust gas temperature is
equal to or higher than the automatic recovery reference
ature (S107). When it is determined that the exhaust
gas temperature is equal to or higher than the automatic
recovery reference temperature, the s proceeds to step
S108 to start the automatic recovery ion in step S109 and
the uent steps.
On the other hand, when the t gas temperature is
lower than the automatic ry reference temperature, the
process proceeds to step S124 where the dummy load L is cut
off, and in step S16, determination is made as to whether or not
the PM amount is equal to or higher than the manual recovery
reference amount. When the PM amount is less than the
manual recovery reference amount, the process returns to step
S4 where the engine E is operated in a normal manner. When
the PM amount is equal to or more than the manual recovery
reference amount, the process proceeds to step S17 to issue a
manual recovery request.
The description of the operation returns to step S103.
When the load increases rapidly during the set duration for the
timer in step 103 (S104a), the process immediately proceeds to
step S105 where the dummy load L is cut off. The process then
returns to step S101. In this case, the dummy load L is cut off
in response to the rapid increase in load in order to e all
of the power supply capability of the engine tor to the
load on the assumption that the rapid increase in load is due to,
for example, starting of the electric motor. This also applies to
a period of an automatic recovery operation described below.
Furthermore, when the load becomes equal to or more
than the reference value during the set duration for the timer
(S104b), the process proceeds to step S106 where the dummy
load L is cut off using another timer (retention time 2) (S105).
The process then returns to step S101. Furthermore, when the
load becomes less than the reference value during the set
duration for another timer, the process returns to step S103
with the dummy load L remaining applied on the generator.
"Dummy load control during an automatic recovery operation
according to the present invention"
When an automatic recovery operation is started in step
$108 as bed above, the engine E is controlled to burn the
particulate matter (automatic recovery) in step 5109. The
process then proceeds to step 5110.
Step $110 determines whether or not the dummy load L
is currently d on the generator. If the dummy load is
currently d on the generator, when the load increases
rapidly (5111) or is equal to or more than the reference value
(3113), the dummy load L is cut off in step 5112.
Furthermore, when, in step 5113, the load is less than
the reference value, the process proceeds to step $114 to
ine whether or not the PM amount has reached the
automatic recovery end reference amount. When the PM
amount has reached the automatic recovery end reference
amount, the automatic recovery ends (5118). On the other
hand, when the PM amount is less than the automatic recovery
end nce amount, the process proceeds to step 5121.
Step 121 ines whether or not the exhaust gas
temperature is equal to or higher than the automatic recovery
reference temperature. When the exhaust gas ature is
equal to or higher than the automatic recovery reference
temperature, the process returns to step $109 to ue the
tic recovery operation.
If, in step $110, the dummy load L has not been applied
on the generator, when the load increases rapidly (5115) or is
equal to or more than the reference value (5116), the process
proceeds to 5114. Furthermore, when the load is less than the
reference value, the dummy load L is applied on the generator
(8117) and proceeds to step 5114 to determine whether or not
the PM amount meets the automatic recovery end nce.
When, in step 5114, the PM amount has reached the
automatic recovery end reference amount, the process proceeds
to step $118 to end the automatic recovery and then proceeds
to step 5119 to check whether or not the dummy load L has
been applied on the generator. When the dummy load L has
been applied on the generator, the process proceeds to step
S120 to cut off the dummy load L. When the dummy load L
has not been applied on the generator, the process returns to
step S4 where the engine generator is operated in a normal
manner.
On the other hand, when step S114 determines that the
PM amount does not meet the automatic recovery end reference,
step S121 determines whether or not the exhaust gas
temperature is equal to or higher than the automatic recovery
reference ature. When the t gas temperature is
lower than the automatic recovery nce temperature, the
process temporarily suspends the automatic recovery (S122)
and ds to step S123 to determine whether or not the
dummy load L has been d on the generator. When the
dummy load L has not been applied on the generator, the
dummy load L is applied on the generator (S102). When the
dummy load has been applied on the generator, (determining
the automatic recovery to be no longer effective) the dummy
load L is cut off (S124) and ds to S17 to issue a manual
recovery request.
When, in step S121, the exhaust gas ature is
equal to or higher than the tic recovery reference
temperature, the process proceeds to step S109 to continue the
automatic recovery. This is followed by the ion in step
S110 and the subsequent steps.
Now, a technical prerequisite for the present invention is
that a state is basically avoided in which, even though the
dummy load L is applied on the generator (S102) to increase
the load on the engine E, the exhaust gas temperature fails to
rise and is lower than the automatic recovery reference. Such
a state could only occur when there should have been a very
abnormal situation such as an extreme decrease in outside
temperature to an unexpected value or a failure in mechanical
element.
Embodiment 2
Embodiment 1 above is described on the e that the
output power voltage from the generator is fixed. However,
given that many generators on the markets are switchable
between a three—phase 400 V class and a three—phase 200 V
class, the dummy load L is desirably made switchable in
response to switching of the voltage.
To achieve this, for example, a voltage detecting relay
may be provided in an input n of the dummy load L so as
to allow automatic switching of the dummy load L according to
the voltage of the generator. In the dummy load L, resistors
may be connected to be switchable between a series connection
and a parallel connection or between a star connection and a
delta connection. When the output power voltage from the
generator is high, the connection may be ed to the series
connection or the star tion. When the output power
voltage from the generator is low, the connection may be
ed to the parallel connection or the delta connection.
DESCRIPTION OF SYMBOLS
E Engine
G Generator
DPF Diesel particulate filter
DOC ion catalyst
TD Temperature measuring device
PMD Particulate matter amount measuring device
ECU Engine control unit
G—ECU Engine controlling additional unit
MC Contactor
L Dummy load
Claims (6)
1. A Diesel Particulate Filter (DPF) recovery system for an engine which drives a generator, having a particulate matter 5 amount measuring device which detects the amount of particulate matter attached to the DPF, and a temperature measuring device which detects the temperature of the exhaust gas of the engine so as to carry out a recovery process of the DPF to remove particulate matter generated by combustion of 10 fuel for the engine when an amount of the particulate matter attached to the DPF exceeds a predetermined value, by performing an automatic recovery operation to raise a temperature of the t gas so as to burn the particulate matter, the DPF recovery system sing: 15 a dummy load to be connectable to the generator; and a control device, including an engine control unit and an engine controlling additional unit, for allowing the engine to perform the automatic recovery operation by cooperation of the engine control unit and the engine controlling additional unit 20 according to the detected signals from the ulate matter amount measuring device and from the temperature measuring device; wherein the control device operates the engine in such a manner that, when the amount of the particulate matter 25 exceeds the predetermined value, it immediately allows the automatic recovery operation when the temperature of the exhaust gas reaches an automatic recovery reference temperature, and it connects the dummy load to the generator when the temperature of the exhaust gas does not reach the 30 automatic ry reference temperature to raise the temperature of the t gas so as to carry out the automatic recovery ion; n the l device r comprises: a first timer for setting a retention time which is required for raising 35 the temperature of the exhaust gas to reach the automatic recovery operation reference since connecting the dummy load, wherein the control device judges whether the temperature of the exhaust gas exceeds the automatic recovery reference temperature, 5 carries out a recovery process immediately when the temperature of the exhaust gas exceeds the tic recovery reference temperature, connects the dummy load to the generator when the temperature of the exhaust gas does not exceed the automatic 10 recovery reference temperature, judges whether the temperature of the exhaust gas exceeds the automatic recovery reference temperature after the retention time of the first timer has passed, carries out the automatic recovery operation when the 15 temperature of the exhaust gas exceeds the automatic recovery reference temperature, cuts off the dummy load when the temperature of the t gas does not exceed the automatic ry reference temperature, and 20 judges whether the amount of particulate matter s a manual recovery nce amount, so as to generate a manual recovery request if the amount of the particulate matter s the manual recovery reference, or to carry out a normal operation of the engine if 25 the amount of the particulate matter does not exceed the same.
2. The DPF recovery system for the engine according to Claim 1, wherein the control device comprises: 30 a second timer for producing an output, when a predetermined time for disconnecting the dummy load has passed, wherein the l device measures the amount of the load of the generator, 35 judges r the amount of the load exceeds a manual recovery reference, cuts off the dummy load when the load of the generator does not exceed the reference but increases rapidly, cuts off the dummy load after the ion time of the second timer has passed when the load of the generator does 5 not exceed the reference but increases rapidly, and does not cut off the dummy load and return to the state just after connecting the dummy load when the load of the generator decreases below the reference during the retention time of the second timer.
3. The DPF recovery system for the engine according to Claim 1, wherein the control device measures an amount of the load connected to the generator, 15 judges whether the amount of the load of the generator exceeds a predetermined nce value, in the case the dummy load is connected under the automatic recovery operation, cuts off the dummy load when the amount of the load 20 of the generator exceeds the nce value, or when the amount of the load of the generator does not exceed the reference value but increases rapidly, in the case the dummy load is not connected under the automatic recovery operation, 25 connects the dummy load when the amount of the load of the generator does not exceed the reference value, measures the amount of the particulate matter, ends the automatic recovery operation if the reference for ending the tic recovery operation is satisfied, and 30 measures the ature of the exhaust gas by means the temperature measuring device, continuously carrying out the automatic recovery ion when the temperature of the t gas exceeds the reference, and stops the automatic recovery operation when the 35 exhaust gas does not exceed the predetermined reference, judges if the dummy load is connected, and judges whether the amount of the particulate matter exceeds the manual recovery reference, and connects the dummy load if disconnected so as to restart the preparation for the automatic recovery ion.
4. The DPF recovery system for the engine according to Claim 1, wherein the control device judges whether the dummy load is connected to the 10 generator after ending the automatic recovery operation, and cuts off the dummy load if the dummy load is connected.
5. The DPF recovery system for the engine according to Claim 1, wherein 15 the dummy load is built to be switchable in relation to the voltage of the tor.
6. A Diesel ulate Filter (DPF) recovery system for an engine substantially as herein bed with reference to any 20 one of the embodiments illustrated in
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013159627A JP5917457B2 (en) | 2013-07-31 | 2013-07-31 | DPF system for engine generator |
JP2013-159627 | 2013-07-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ627799A NZ627799A (en) | 2016-01-29 |
NZ627799B true NZ627799B (en) | 2016-05-03 |
Family
ID=
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