WO2005124130A1 - 車両用内燃機関の排気浄化装置 - Google Patents
車両用内燃機関の排気浄化装置 Download PDFInfo
- Publication number
- WO2005124130A1 WO2005124130A1 PCT/JP2005/011132 JP2005011132W WO2005124130A1 WO 2005124130 A1 WO2005124130 A1 WO 2005124130A1 JP 2005011132 W JP2005011132 W JP 2005011132W WO 2005124130 A1 WO2005124130 A1 WO 2005124130A1
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- WO
- WIPO (PCT)
- Prior art keywords
- combustion engine
- internal combustion
- state
- fuel
- adsorbent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0835—Hydrocarbons
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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/101—Three-way catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
-
- 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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
-
- 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust gas purification device for an internal combustion engine for a vehicle, and more particularly to a technology for improving the performance of purifying HC (hydrocarbon) discharged when the internal combustion engine is cold.
- an exhaust system of an engine is provided with an exhaust purification device that purifies harmful substances (HC, CO, NOx, etc.) in exhaust gas using, for example, a three-way catalyst.
- a three-way catalyst cannot exhibit sufficient purification performance until the activation temperature is reached, and even if the three-way catalyst is arranged close to the engine body to achieve early activation, the cold start of the engine is not possible.
- the HC cannot be sufficiently purified.
- an exhaust gas purification catalyst layer is provided on an HC adsorbent layer that is effective for adsorbing HC, and the HC adsorbs the HC into the HC adsorbent layer and desorbs when reaching a certain temperature.
- an HC adsorption catalyst that oxidizes and removes oxygen using the oxygen trapped in the exhaust gas purification catalyst layer.
- the AZT generally has a fluid coupling that can be switched between a directly connected state and a non-directly connected state by a lock-up clutch (directly connected clutch).
- ⁇ having such a lock-up clutch
- the friction characteristics of the transmission oil (ATF, etc.) are not stable, so that if the vehicle is in the direct connection state, the shift control will not be stable. Due to this, the vehicle may vibrate or otherwise cause a bad feeling. Therefore, normally, it is impossible to switch the lock-up clutch to the directly connected state.
- the HC adsorbent is also relatively favorably oxidized and removed from the HC adsorbed material, but the NO adsorbed by lean combustion is rather reduced.
- An object of the present invention is to provide an exhaust system for a vehicle internal combustion engine capable of improving HC purification performance while preventing deterioration of the driver's driverness of the vehicle, particularly when the internal combustion engine is cold. It is an object of the present invention to provide a purification device.
- the present invention provides an exhaust purification device for an internal combustion engine for a vehicle.
- the internal combustion engine has a multi-cylinder power and is provided in an exhaust system, and adsorbs HC in exhaust when in a predetermined low temperature range, and desorbs the adsorbed HC when the temperature exceeds the predetermined low temperature range.
- a desorption state detection element for detecting that the internal combustion engine is in a predetermined deceleration state; a fuel supply element for supplying fuel to the internal combustion engine; When the desorption state detecting element detects that the HC adsorbent is in a state of desorbing the adsorbed HC and the deceleration state detecting element detects that the internal combustion engine is in a predetermined deceleration state.
- a control element for controlling the operation of the fuel supply element so as to stop the fuel supply and supply the fuel to the remaining cylinders.
- the desorption state detecting element includes an HC adsorbent temperature detecting element for detecting the temperature of the HC adsorbent, and the HC adsorbent temperature detecting element detects the temperature of the HC adsorbent in a predetermined range. It is better to detect that the HC adsorbent is in a state of desorbing the adsorbed HC by detecting that the HC adsorbent is in the air.
- the desorption state detecting element includes a timing element for measuring an elapsed time after the start of the internal combustion engine, and detects that the elapsed time after the start is within a predetermined range by the timing element.
- the timing element for measuring an elapsed time after the start of the internal combustion engine, and detects that the elapsed time after the start is within a predetermined range by the timing element.
- the engine control device further includes an engine temperature detecting element for detecting a temperature of the internal combustion engine, wherein the control element detects that the internal combustion engine is in a predetermined cold state by the engine temperature detecting element.
- the desorption state detection element detects that the HC adsorbent is in a state of desorbing the adsorbed HC
- the deceleration state detection element detects that the internal combustion engine is in a predetermined deceleration state. Then, it is preferable to stop the fuel supply to some cylinders of the internal combustion engine and control the operation of the fuel supply element so as to supply fuel to the remaining cylinders.
- the fuel control element supplies the fuel such that the air-fuel ratio in the remaining cylinder becomes the stoichiometric air-fuel ratio.
- a throttle opening adjusting element for adjusting a throttle opening of the internal combustion engine is further provided, and the control element desorbs the HC adsorbed by the HC adsorbent by the desorption state detecting element.
- the throttle opening adjustment element is operated to increase the throttle opening. Good to do.
- control element stops detecting that the HC adsorbent is in a state of desorbing the adsorbed HC by the desorption state detection element
- the control element detects the internal combustion state by the deceleration state detection element.
- the operation of the fuel supply element may be controlled so as to stop supplying fuel to all cylinders of the internal combustion engine.
- control element detects that the HC adsorbent is in a state of desorbing the adsorbed HC by the desorption state detection element
- the control element detects the deceleration state by the deceleration state detection element. Even when it is detected that the internal combustion engine is in a predetermined deceleration state, the operation of the fuel supply element may be controlled so as to continue supplying fuel to all cylinders of the internal combustion engine.
- the driving force of the internal combustion engine be shifted to the output shaft of the internal combustion engine via a fluid coupling which can be switched between a direct connection state and a non-connection state by a direct connection clutch, and And a clutch control element for switching the direct coupling clutch to a non-direct coupling state at least when the automatic transmission is at a predetermined low temperature, and detecting a non-direct coupling state of the direct coupling clutch.
- a clutch state detecting element wherein the control element stops fuel supply to a part of the cylinder of the internal combustion engine when the non-directly connected state of the direct coupling clutch is detected by the clutch state detecting element, and controls the remaining.
- the operation of the fuel supply element is controlled so as to supply fuel to the cylinder.
- an automatic transmission that changes the driving force of the internal combustion engine and transmits it to wheels is connected to the output shaft of the internal combustion engine via a fluid coupling that can be switched between a direct connection state and a non-direct connection state by a direct connection clutch.
- a direct connection clutch when the automatic transmission is at a predetermined low temperature, if the direct connection clutch is in the direct connection state, the speed change control is not stabilized, and the feeling of the vehicle body vibrates due to this. Therefore, the direct coupling clutch is normally switched to the non-coupling state. Thus, when the direct coupling clutch is in the non-coupling state, the partial fuel cut is performed.
- the direct coupling clutch when the direct coupling clutch is in the direct coupling state, the internal combustion engine is rotated by the power from the wheels, so that the fuel cut can be performed for all cylinders instead of the partial fuel cut, and the fuel consumption can be prevented. it can.
- FIG. 1 is a schematic configuration diagram of an exhaust gas purification device for an internal combustion engine according to the present invention mounted on a vehicle;
- FIG. 2 is a flowchart showing a fuel cut determination routine according to a first embodiment of the present invention.
- FIG. 3 is a flowchart showing a control routine of fuel cut control according to the first embodiment of the present invention.
- FIG. 4 is a flowchart showing a fuel cut determination routine according to a second embodiment of the present invention.
- FIG. 5 is a flowchart showing a control routine of fuel cut control according to a second embodiment of the present invention.
- FIG. 6 is a time chart showing an example of a control result of fuel cut control.
- FIG. 1 there is shown a schematic configuration diagram of an exhaust gas purification device for an internal combustion engine according to the present invention mounted on a vehicle, and the configuration of the exhaust gas purification device will be described below with reference to FIG.
- An automatic transmission (A / T) 10 is connected to a drive shaft 2 of an engine (internal combustion engine) 1 through a fluid coupling 4, and a differential gear unit (not shown) and an axle (not shown) are connected to the AZT 10. Are connected via a pair of wheels.
- a continuously variable transmission (CVT) may be used instead of the AZT10.
- an intake pipe injection type four-cylinder gasoline engine is adopted, and the cylinder head 20 of the engine 1 has an intake port of each cylinder (# 1, # 2, # 3, # 4).
- An intake manifold 22 is connected so as to communicate with the branch passage, and an intake pipe 24 is connected to the intake manifold 22.
- the intake pipe 24 is provided with a throttle valve 26 for adjusting the amount of intake air.
- An electromagnetic fuel injection valve (fuel supply element) 28 is provided in each branch passage of the intake manifold 22, and the fuel injection valve 28 is supplied with fuel through a fuel pipe 29.
- a unit (not shown) is connected, and fuel is supplied through the fuel pipe 29.
- An exhaust manifold 30 is connected to the cylinder head 20 so that the exhaust port of each of the cylinders (# 1, # 2, # 3, # 4) and the branch passage communicate with each other.
- An exhaust pipe 32 is connected to the exhaust manifold 30.
- a spark plug 39 is provided in the cylinder head 20 so as to face a combustion chamber for each cylinder.
- Each spark plug 39 is connected to a battery (not shown) via an ignition coil 38. It is connected to the.
- the cylinder head 20 is provided with various valve operating mechanisms in addition to an intake valve and an exhaust valve for communicating and shutting off an intake port, an exhaust port and a combustion chamber. Is omitted.
- a three-way catalyst 34 is interposed in the exhaust pipe 32 in the vicinity of the engine 1 for early activation, and an HC trap catalyst 36 is provided downstream of the three-way catalyst 34 in the exhaust gas. Interposed
- the three-way catalyst 34 contains platinum (Pt) or the like as a noble metal, and when the catalyst temperature is higher than a predetermined temperature (about 250 ° C to 350 ° C), the exhaust air-fuel specific force S stoichiometric (theoretical When the air-fuel ratio is around), it is possible to capture enough oxygen around the noble metal to oxidize and remove HC and CO and to reduce and remove NOx well.
- a predetermined temperature about 250 ° C to 350 ° C
- S stoichiometric theoretical When the air-fuel ratio is around
- the HC trap catalyst 36 contains, for example, an HC adsorbent mainly composed of zeolite ( ⁇ -type zeolite, etc.), and adsorbs HC in exhaust gas at a predetermined low-temperature region (for example, a region of less than 100 ° C.). At the same time, it has the property of releasing adsorbed HC when the catalyst temperature rises to a predetermined temperature (for example, 100 ° C to 150 ° C) or more. In other words, the HC trap catalyst 36 adsorbs HC in exhaust gas and removes HC air from the atmosphere when the engine 1 is in a cold state and the amount of HC emission is large and the three-way catalyst 34 is not yet activated. It plays a role in reducing the amount of emissions to the inside.
- the HC trap catalyst 36 contains platinum (Pt) or the like as a noble metal similarly to the three-way catalyst 34, and has a three-way catalyst function (an oxidation catalyst function and a reduction catalyst function) in addition to the HC adsorption function.
- a predetermined temperature about 250 ° C to 350 ° C
- the HC trap catalyst 36 can exhibit the oxidation catalyst function under an oxygen-excess atmosphere even when the activated state is not reached and oxygen is not sufficiently captured around the noble metal.
- HC and CO can be removed relatively satisfactorily.
- the fluid coupling 4 is known as a torque converter, and includes a pump 4a, a turbine 4b, and a stator (not shown).
- the fluid coupling 4 has a lock-up clutch (directly-coupled clutch) 6 for connecting and disconnecting the pump 4a and the turbine 4b, and a hydraulic unit 8 for controlling connection and disconnection of the lock-up clutch 6. Or the running condition of engine 1 It is possible to switch between direct connection (lock-up) and non-direct connection (slip state, disconnection state) according to the situation.
- the engine 1 is provided with a crank angle sensor 40 that detects the crank angle by monitoring the rotation of the crank shaft, and the crank angle sensor 40 detects the engine rotation speed Ne.
- the engine 1 has an idle switch (idle SW) (deceleration state detecting element) 42 for detecting an idling operation of the engine 1, and a warm-up of the engine 1 by detecting a cooling water temperature, that is, an engine water temperature.
- a water temperature sensor (engine temperature detecting element) 44 for detecting the state is provided.
- the HC trap catalyst 36 is provided with a temperature sensor (HC adsorbent temperature detecting element) 46 for detecting the temperature of the HC trap catalyst 36, that is, the HC trap temperature.
- a temperature sensor HC adsorbent temperature detecting element
- the electronic control unit (ECU) 50 is a main control device that controls various controls of the vehicle including the central processing unit (CPU) and the control of the engine 1 having the same power.
- various sensors are connected in addition to the crank angle sensor 40, the idle SW 42, the water temperature sensor 44, and the temperature sensor 46 described above.
- connection / disconnection state of the lock-up clutch 6 can be easily detected based on a control command to the hydraulic hood 8 (clutch state detection element).
- the engine 1 is configured to be able to perform so-called fuel cut control in which supply of fuel from the fuel injection valve 28 is temporarily stopped (cylinder closed) based on information from the ECU 50.
- the engine 1 includes a fuel cut (all-cylinder fuel cut) in which all the cylinders are closed and a fuel cut adsorbed on the HC trap catalyst 36.
- Fuel cut (control element).
- a routine for the fuel cut determination according to the first embodiment executed by the ECU 40 is shown in a flowchart.
- the routine for the fuel cut control according to the first embodiment is shown.
- the control routine is shown by flowcharts, and will be described below with reference to these flowcharts.
- step S10 various sensors and various data are read in order to make a fuel cut determination.
- step S12 it is determined based on the cooling water temperature information from the water temperature sensor 44 whether or not the engine water temperature is lower than the predetermined temperature Twl. If the determination result is false (No) and it is determined that the engine water temperature is equal to or higher than the predetermined temperature Twl and the engine 1 is in a warm-up state, the process proceeds to step S24, and the partial fuel cut flag is set to OFF. . That is, when engine 1 is in a warm-up state, the amount of HC emission is smaller than in a cold state, and it can be determined that the three-way catalyst 34 and the HC trap catalyst 36 are in an active state due to exhaust heat. Then, the partial fuel cut flag is set to OFF so that the partial fuel cut is not performed.
- step S12 determines whether the engine water temperature is lower than the predetermined temperature Twl and the engine 1 is in a cold state (predetermined cold state).
- HC adsorbs a large amount of HC, and it can be determined that there is a high possibility that the adsorbed HC is desorbed due to a rise in the temperature of the HC trap catalyst 36. move on.
- step S14 it is determined whether or not the idle SW 42 is ON and the engine 1 is in an idle operation state. More specifically, here, it is determined whether or not the vehicle is decelerating and the engine 1 is in an idle operation state, as well as when the vehicle is stopped and the engine 1 is in an idle operation state. When the determination result is false (No), the process proceeds to step S24. On the other hand, Idle SW42 In another result is true (Y es) is ON, i.e., the vehicle is not a decelerating particularly required power output engine, is determined also situations where problems such ⁇ implemented partial fuel cut In this case, the process proceeds to step S16.
- step S16 based on the information from the temperature sensor 46, the temperature of the HC trap catalyst 36 is higher than a predetermined low temperature T1 (for example, 100 ° C) at which HC starts desorbing from the C trap catalyst 36. It is determined whether or not (desorption state detection element). If the determination result is false (No) and it is determined that the temperature of the HC trap catalyst 36 is still equal to or lower than the predetermined low temperature T1, HC is adsorbed satisfactorily on the HC trap catalyst 36, while the HC trap catalyst 36 Since the HC does not desorb from the fuel, the process goes to step S24 where partial fuel cut is not necessary. On the other hand, if the result of the determination is true (Yes) and the temperature of the HC trap catalyst 36 is determined to be greater than the predetermined low temperature TU, the process proceeds to step S18.
- T1 for example, 100 ° C
- step S18 similarly to the above, it is determined whether or not the temperature of the HC trap catalyst 36 is lower than a predetermined high temperature Th (for example, T1 + 200 ° C.) at which HC is not desorbed from the HC trap catalyst 36.
- a predetermined high temperature Th for example, T1 + 200 ° C.
- the flow proceeds to step S24 to prevent the unnecessary partial fuel cut from being performed.
- the determination result is true (Yes) and it is determined that the temperature of the HC trap catalyst 36 is lower than the predetermined high temperature Th, the process proceeds to step S20.
- step S16 and step S18 By performing the determinations in step S16 and step S18 in this manner, the time when the temperature of the HC trap catalyst 36 is between the predetermined low temperature T1 and the predetermined high temperature Th (within a predetermined range), that is, It is possible to easily perform the partial fuel cut in accordance with the time when HC is desorbed from the HC trap catalyst 36, and it is possible to carry out efficiently.
- step S20 it is determined whether or not lock-up clutch 6 is OFF, that is, is in a non-directly connected state.
- step S20 it is determined whether or not the AZT 10 is in a cold state and the lock-up clutch 6 is in the non-coupled state, and the AZT 10 is in a non-coupled state.
- step S20 If the result of the determination in step S20 is false (No) and the lock-up clutch 6 is in the directly engaged state, the power from the wheels rotates the engine 1, so even if the engine 1 is cut off in all cylinders, the engine There is no possibility that the rotation speed Ne drops sharply. In other words, if the lock-up clutch 6 is in a directly connected state, it is not necessary to perform a partial fuel cut and secure the engine rotation by injecting fuel into the remaining cylinders. Therefore, in this case, the process proceeds to step S24 to prevent the unnecessary partial fuel cut. On the other hand, if the result of the determination in step S20 is true ( Yes ) and it is determined that the lockup clutch 6 is in the non-direct connection state, the process proceeds to step S22.
- step S22 the partial fuel cut flag is set to ON. That is, the engine water temperature is lower than the predetermined temperature Twl, the idle SW is ON, the vehicle is in a deceleration state, the temperature of the HC trap catalyst 36 is between the predetermined low temperature T1 and the predetermined high temperature Th, and the lock-up clutch 6 is In the case of a non-direct connection state, the partial fuel cut flag is set to ON to allow partial fuel cut.
- step S30 based on the fuel cut determination, it is determined whether or not the preset partial fuel cut flag force is ON. When the determination result is true (Yes) and the partial fuel cut flag is ON, the process proceeds to step S32, and the partial fuel cut control is performed.
- the fuel supply is stopped for two of the four cylinders (for example, # 1, # 4 cylinders), and the remaining two cylinders (for example, # 2, # 3 cylinders) are supplied with fuel as usual.
- Implement supply At this time, fuel injection is performed for the remaining two cylinders to be supplied with fuel so that the stoichiometric air-fuel ratio (stoichiometric air-fuel ratio) is obtained.
- the engine 1 is a V-type engine and each bank has an exhaust passage and each exhaust passage has an air-fuel ratio sensor
- the fuel injection is stopped for one bank side. It is also possible to implement stoichiometric feedback control by supplying fuel to the other bank. is there.
- the air-fuel ratio is set to open-loop control.
- the partial fuel cut control is performed as described above, for example, when the all-cylinder fuel cut is performed when the lock-up clutch 6 is in the non-direct connection state, the engine rotation speed Ne sharply decreases, and At this time, the fuel return rotation speed is reached and fuel injection is restarted, and oxygen cannot be supplied to the exhaust system by the fuel cut, and HC desorbed from the HC adsorbent is sufficiently oxidized.
- the reduction of the engine rotation speed Ne is prevented, and air is discharged well from some cylinders to the exhaust system, and the oxygen in the air is used as surplus oxygen and the HC adsorbent
- the HC to be desorbed can be sufficiently oxidized by the oxidizing catalyst function of the HC trap catalyst 36.
- the opening of the throttle valve 26 ( By adjusting the throttle opening) to the increasing side and adjusting the fuel supply accordingly, the engine torque can be increased while maintaining a low engine speed Ne and a stoichiometric condition that reduces the driver's drivership. Is possible.
- step S34 it is determined whether or not the engine speed Ne has become lower than the fuel return speed.
- the fuel return rotation speed is set to be higher as the engine water temperature is lower V, according to the engine water temperature.
- step S30 determines whether the result of the determination in step S30 is false (No) and the partial fuel cut flag is OFF.
- step S38 it is determined whether or not the condition for executing the all-cylinder fuel cut is satisfied.
- the conditions for executing the all-cylinder fuel cut for example, whether or not the idle SW is ON and the vehicle is in a deceleration state is applied. Therefore, here, for example, if the idle SW is OFF, the determination result is false (No), and the process proceeds to step S36, in which fuel injection is performed for all cylinders, and normal operation is performed.
- the partial fuel cut flag is OFF but the idle SW is ON, for example, the determination result is true (Yes), and the process proceeds to step S40.
- step S40 while the partial fuel cut flag is OFF, the result of the determination in step S16 is true (Yes), ie, whether the power of the HC trap catalyst 36 is higher than the predetermined low temperature T by a large amount. Determine whether or not. If the determination result is true (Yes), the program proceeds to step S44 in response to fulfillment of the all-cylinder fuel cut execution condition, performs all-cylinder fuel cut, and determines the engine speed Ne by the determination in step S34. As long as the engine speed does not fall below the fuel return rotation speed, the fuel cut for all cylinders is continued.
- step S20 the determination result of step S20 is false (No), and the partial fuel cut flag is OFF because the lockup clutch 6 is in the directly connected state.
- the all-cylinder fuel cut is performed.
- the engine speed Ne will drop sharply even if fuel is cut off for all cylinders in the first cylinder. Unnecessary fuel supply can be suppressed and fuel consumption can be prevented from deteriorating.
- the determination result is false (No)
- the HC trap catalyst 36 has not yet reached the desorption temperature. Therefore, even if the execution condition of the all-cylinder fuel cut is satisfied, the process proceeds to step S36, and the fuel injection is performed for all the cylinders. As a result, the temperature of the HC trap catalyst 36 can be prevented from lowering.
- FIG. 6 an example of a control result of the fuel cut control is shown in a time chart.
- the idle SW is turned on.
- the temperature of the HC trap catalyst 36 is between the predetermined low temperature T1 and the predetermined high temperature Th, and the lock-up clutch 6 is not directly connected, the partial fuel cut is performed.
- sufficient oxygen is secured in the exhaust system.
- HC desorbed by the HC adsorbent is sufficiently oxidized and removed by the oxidation catalyst function of the HC trap catalyst 36 while preventing the driver's utility of the vehicle from being degraded.
- a determination routine of the fuel cut determination according to the second embodiment executed by the ECU 40 is shown in a flowchart.
- the routine of the fuel cut control according to the second embodiment is shown.
- the control routine is shown by flowcharts, and will be described below with reference to these flowcharts.
- the second embodiment is different from the first embodiment in that the time when HC is desorbed from the HC trap catalyst 36 is determined not based on the temperature of the HC trap catalyst 36 but on the elapsed time after the engine 1 is started.
- differences from the first embodiment will be described, and the same parts as those in the first embodiment will be briefly described with the same step numbers attached thereto, and the differences from the first embodiment will be mainly described.
- step S12 the determination result in step S12 is true (Yes), that is, it is determined that the engine water temperature is lower than the predetermined temperature Twl and the engine 1 is in a cold state (predetermined cold state). If so, the process proceeds to step S13.
- step S13 predetermined post-start time tl and t2 (tl ⁇ t2) of engine 1 corresponding to the time when HC is desorbed from HC trap catalyst 36 according to the engine water temperature are set.
- the relationship between the engine water temperature and the predetermined elapsed time tl and t2 after the start is set in advance as a map based on experiments and the like.In practice, the predetermined elapsed time tl and t2 after the start are determined by the engine water temperature. The map power is read out accordingly.
- step S14 If the determination result of step S14 is true (Yes) and the idle SW 42 is ON, the process proceeds to step S16 '.
- step S 16 ′ it is determined whether or not the elapsed time after the start of the engine 1 measured by the timer of the ECU 50 is greater than the predetermined elapsed time tl after the start (detachment state detection element). . If the determination result is false (No) and it is determined that the elapsed time after the start is still equal to or less than the predetermined elapsed time tl after the start, the HC trap catalyst 36 adsorbs HC well, while the HC trap catalyst 36 From 36, it can be determined that HC does not desorb, and the partial fuel cut proceeds to the necessary step S24, and the partial fuel cut flag is set to OFF. On the other hand, if the determination result is true (Yes) and it is determined that the post-start elapsed time is greater than the predetermined post-start elapsed time tl, the process proceeds to step S18 '.
- step S18 ′ similarly to the above, it is determined whether or not the force is such that the elapsed time after the start of the engine 1 is smaller than the predetermined elapsed time t2 after the start (disengagement state detection element). If the determination result is false (No) and it is determined that the post-start elapsed time is equal to or longer than the predetermined post-start elapsed time t2, the process proceeds to step S24 to prevent unnecessary partial fuel cuts from being performed. On the other hand, if the determination result is true (Yes) and it is determined that the post-start elapsed time is shorter than the predetermined post-start elapsed time t2, the process proceeds to step S20.
- step S16 and step S18 the elapsed time after the start of the engine 1 is between the predetermined elapsed time tl and the predetermined elapsed time t2 (the predetermined range). It is possible to easily perform the partial fuel cut in accordance with the timing of (2), that is, the timing when HC is desorbed from the HC trap catalyst 36, and to carry out efficiently.
- step S20 it is determined whether or not the lock-up clutch 6 is OFF, that is, whether or not the lock-up clutch 6 is in a non-direct connection state. Proceed to step S24 to prevent the execution of a special partial fuel cut. On the other hand, if the result of the determination in step S20 is true (Yes) and it is determined that the lock-up clutch 6 is not directly connected, the process proceeds to step S22 where a partial fuel cut is to be performed, and the partial fuel cut is performed. Set the on flag to ON.
- step S30 of FIG. 5 it is determined whether or not the partial fuel cut flag set in the fuel cut determination is ON, and the determination result is true (Yes), and the partial fuel cut flag is ON. In this case, the process proceeds to step S32, and the partial fuel cut control is performed.
- HC can be sufficiently oxidized by the oxidizing catalyst function of the HC trap catalyst 36, and hunting of the engine output and the engine speed Ne can be avoided to prevent the drivability of the vehicle from deteriorating. can do.
- throttle opening By adjusting the opening of the throttle valve 26 (throttle opening) to an increasing side during the partial fuel cut control, it is possible to increase the amount of air exhausted from some cylinders and, consequently, the amount of excess oxygen. By adjusting the fuel supply, the engine torque can be increased while maintaining the stoichiometry without deteriorating the driver's spirit.
- step S34 it is determined whether or not the engine rotation speed Ne is lower than the fuel return rotation speed. If the determination result is false (No), the partial fuel cut control is continuously performed. If true (Yes), the process proceeds to step S36, fuel injection is performed for all cylinders, and normal operation is performed.
- step S30 determines whether or not the conditions for implementing all-cylinder fuel cut have been satisfied.
- the determination result of step S38 is false (No)
- the process proceeds to step S36, in which fuel injection is performed for all cylinders, and normal operation is performed.
- the partial fuel cut flag is OFF but the idle SW is ON, for example, the determination result is true (Yes), and the process proceeds to step S40.
- step S40 ' while the partial fuel cut flag is OFF, the determination result in step S16' above is true (Yes), that is, the elapsed time after the start of the engine 1 is a predetermined start time. It is determined whether or not the elapsed time t is longer. If the determination result is true (Yes), the program proceeds to step S44 in response to fulfillment of the conditions for performing all-cylinder fuel cut, and performs all-cylinder fuel cut. As a result, unnecessary fuel supply can be suppressed and fuel consumption can be prevented.
- the engine water temperature is lower than the predetermined temperature Twl.
- the elapsed time after starting the engine 1 is between the predetermined elapsed time tl after the start and the predetermined elapsed time t2 after the start, and the lock-up clutch 6 is not directly connected.
- a partial fuel cut is performed and excess oxygen is sufficiently secured in the exhaust system.
- the HC adsorbent power is sufficiently oxidized by the oxidation catalyst function of the HC trap catalyst 36 while preventing the driver's drivership of the vehicle from deteriorating. Removed.
- the engine water temperature is lower than the predetermined temperature Twl (step S12), the idle SW is turned on, the vehicle is in a deceleration state (step S14), and the HC is disconnected from the HC trap catalyst 36.
- the partial fuel cut is performed on condition that the lock-up clutch 6 is in the disengaged state (step S16 and step S18 or step S16 'and step S18') and the lock-up clutch 6 is not directly connected (step S20).
- the idle SW is ON and the vehicle is in a deceleration state (step S14), and the HC is separated from the HC trap catalyst 36.
- Step S 16 and Step S 18 or step S16 'and step S18' and the partial fuel cut may be performed on condition that the lock-up clutch 6 is in a non-direct connection state (step S20).
- the partial fuel cut may be performed on condition that the HC is desorbed from the HC trap catalyst 36 (step S16 and step S18 or step S16 and step S18). .
- step S14 regardless of whether the lock-up clutch 6 is in the non-direct connection state when the engine 1 is cold, the idle SW is ON and the vehicle is in a deceleration state (step S14), and the HC
- the partial fuel cut may be performed only on condition that the fuel is desorbed from the HC trap catalyst 36 (step SI6 and step SI8 or step S16 and step S18).
- an intake pipe injection type four-cylinder gasoline engine is adopted as the engine 1.
- the engine 1 is composed of multiple cylinders and may be any engine as long as the fuel can be cut off only in a part of the cylinders. You can.
- the fuel cut is performed for two half cylinders of the four cylinders, and the fuel supply is performed for the other half cylinders.
- the number of fuel cut cylinders and the number of fuel supply cylinders are set. The distribution may be appropriately set within a range in which the excess oxygen can be sufficiently secured without deteriorating the driver's driverness of the vehicle.
- the three-way catalyst 34 is provided close to the engine 1, but the present invention is applicable without the three-way catalyst 34.
- the HC trap catalyst 36 is provided with an oxidation catalyst function to remove HC desorbed from the HC trap catalyst 36 by the oxidation catalyst function.
- a three-way catalyst or an oxidation catalyst may be separately provided downstream of the trap catalyst 36.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/629,500 US7614216B2 (en) | 2004-06-21 | 2005-06-17 | Exhaust cleaning-up device for internal combustion engine for vehicle |
| DE112005001452T DE112005001452B4 (de) | 2004-06-21 | 2005-06-17 | Abgasreinigungsvorrichtung für einen Verbrennungsmotor für ein Fahrzeug |
| JP2006514797A JP4525938B2 (ja) | 2004-06-21 | 2005-06-17 | 車両用内燃機関の排気浄化装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004182812 | 2004-06-21 | ||
| JP2004-182812 | 2004-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005124130A1 true WO2005124130A1 (ja) | 2005-12-29 |
Family
ID=35509740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/011132 Ceased WO2005124130A1 (ja) | 2004-06-21 | 2005-06-17 | 車両用内燃機関の排気浄化装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7614216B2 (ja) |
| JP (1) | JP4525938B2 (ja) |
| DE (1) | DE112005001452B4 (ja) |
| WO (1) | WO2005124130A1 (ja) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2898320A1 (fr) * | 2006-03-13 | 2007-09-14 | Toyota Motor Co Ltd | Dispositif et procede de controle de groupe motopropulseur arriere-plan de l'invention |
| JP2008106696A (ja) * | 2006-10-26 | 2008-05-08 | Mitsubishi Motors Corp | 内燃機関の排気浄化装置 |
| EP2085592A4 (en) * | 2006-11-16 | 2009-12-16 | Yanmar Co Ltd | METHOD FOR CONTROLLING INTERNAL COMBUSTION ENGINE |
| US7874145B2 (en) | 2006-09-15 | 2011-01-25 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Emmision control device for internal combustion engine |
| US8096286B2 (en) | 2006-11-16 | 2012-01-17 | Yanmar Co., Ltd. | Method of controlling internal combustion engine |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090183498A1 (en) * | 2008-01-22 | 2009-07-23 | Kazuya Uchida | Exhaust emission control device |
| DE102015008722A1 (de) * | 2015-07-04 | 2017-01-05 | Man Truck & Bus Ag | Innenmotorischer Heizbetrieb durch Lasterhöhung |
| JP7234996B2 (ja) * | 2020-04-10 | 2023-03-08 | トヨタ自動車株式会社 | エンジン装置およびこれを備えるハイブリッド自動車 |
| JP7700735B2 (ja) * | 2022-06-15 | 2025-07-01 | トヨタ自動車株式会社 | 車両の制御装置 |
| US12480433B2 (en) | 2023-12-20 | 2025-11-25 | Saudi Arabian Oil Company | Active hydrocarbon trap for reduction of emissions from internal combustion engines using a four valve configuration |
| US12435655B2 (en) | 2023-12-20 | 2025-10-07 | Saudi Arabian Oil Company | Active hydrocarbon trap for reduction of emissions from internal combustion engines using a three-valve configuration |
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| JP2000356155A (ja) * | 1999-06-15 | 2000-12-26 | Nissan Motor Co Ltd | エンジンの制御装置 |
| JP2001098935A (ja) * | 1999-10-01 | 2001-04-10 | Nissan Motor Co Ltd | ディーゼルエンジンの制御装置 |
| JP2004353516A (ja) * | 2003-05-28 | 2004-12-16 | Nissan Motor Co Ltd | 車両用エンジンの排気浄化装置 |
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| US5479898A (en) | 1994-07-05 | 1996-01-02 | Ford Motor Company | Method and apparatus for controlling engine torque |
| JP2937034B2 (ja) * | 1994-10-05 | 1999-08-23 | 三菱自動車工業株式会社 | 作動気筒数可変内燃機関を有する車両の運転制御装置 |
| JP3564966B2 (ja) * | 1997-09-19 | 2004-09-15 | トヨタ自動車株式会社 | 排気浄化装置の故障診断装置 |
| JP3951422B2 (ja) | 1998-03-23 | 2007-08-01 | トヨタ自動車株式会社 | 多気筒内燃機関の排気浄化装置 |
| JPH11294146A (ja) * | 1998-04-08 | 1999-10-26 | Nippon Soken Inc | 触媒温度制御方法 |
| JP3680244B2 (ja) * | 1999-02-12 | 2005-08-10 | トヨタ自動車株式会社 | 内燃機関の未燃燃料成分吸着材の吸着量算出装置 |
| JP3374782B2 (ja) * | 1999-04-28 | 2003-02-10 | トヨタ自動車株式会社 | 内燃機関の触媒劣化検出装置 |
| DE60121834T2 (de) * | 2000-02-16 | 2006-11-23 | Nissan Motor Co., Ltd., Yokohama | Abgasreinigungsvorrichtung einer Brennkraftmaschine |
| JP2002038927A (ja) | 2000-07-27 | 2002-02-06 | Toyota Motor Corp | 車輌用エンジン排気装置 |
| JP2002317655A (ja) * | 2001-04-18 | 2002-10-31 | Mitsubishi Motors Corp | 内燃機関の排気浄化装置 |
| JP4206694B2 (ja) | 2002-05-23 | 2009-01-14 | 三菱自動車エンジニアリング株式会社 | 内燃機関の排気浄化装置 |
| JP2004092535A (ja) * | 2002-08-30 | 2004-03-25 | Mitsubishi Motors Corp | 排ガス浄化装置 |
-
2005
- 2005-06-17 JP JP2006514797A patent/JP4525938B2/ja not_active Expired - Fee Related
- 2005-06-17 DE DE112005001452T patent/DE112005001452B4/de not_active Expired - Fee Related
- 2005-06-17 WO PCT/JP2005/011132 patent/WO2005124130A1/ja not_active Ceased
- 2005-06-17 US US11/629,500 patent/US7614216B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000356155A (ja) * | 1999-06-15 | 2000-12-26 | Nissan Motor Co Ltd | エンジンの制御装置 |
| JP2001098935A (ja) * | 1999-10-01 | 2001-04-10 | Nissan Motor Co Ltd | ディーゼルエンジンの制御装置 |
| JP2004353516A (ja) * | 2003-05-28 | 2004-12-16 | Nissan Motor Co Ltd | 車両用エンジンの排気浄化装置 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2898320A1 (fr) * | 2006-03-13 | 2007-09-14 | Toyota Motor Co Ltd | Dispositif et procede de controle de groupe motopropulseur arriere-plan de l'invention |
| US7874145B2 (en) | 2006-09-15 | 2011-01-25 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Emmision control device for internal combustion engine |
| JP2008106696A (ja) * | 2006-10-26 | 2008-05-08 | Mitsubishi Motors Corp | 内燃機関の排気浄化装置 |
| EP2085592A4 (en) * | 2006-11-16 | 2009-12-16 | Yanmar Co Ltd | METHOD FOR CONTROLLING INTERNAL COMBUSTION ENGINE |
| US8096286B2 (en) | 2006-11-16 | 2012-01-17 | Yanmar Co., Ltd. | Method of controlling internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2005124130A1 (ja) | 2008-04-10 |
| JP4525938B2 (ja) | 2010-08-18 |
| DE112005001452T5 (de) | 2007-04-26 |
| US7614216B2 (en) | 2009-11-10 |
| DE112005001452B4 (de) | 2009-02-19 |
| US20070180817A1 (en) | 2007-08-09 |
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