WO2012147143A1 - 内燃機関のデポジット堆積量推定装置 - Google Patents
内燃機関のデポジット堆積量推定装置 Download PDFInfo
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- WO2012147143A1 WO2012147143A1 PCT/JP2011/060026 JP2011060026W WO2012147143A1 WO 2012147143 A1 WO2012147143 A1 WO 2012147143A1 JP 2011060026 W JP2011060026 W JP 2011060026W WO 2012147143 A1 WO2012147143 A1 WO 2012147143A1
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- Prior art keywords
- fuel injection
- amount
- fuel
- torque
- injection amount
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection 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
- 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
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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- 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
Definitions
- the present invention relates to a deposit accumulation amount estimation device for an internal combustion engine.
- combustion products that is, fuel combustion related to the combustion of fuel
- the wall surface near the injection hole outlet of the fuel injection valve that is, the wall surface of the fuel injection valve near the outlet of the fuel injection hole.
- substances produced by When combustion products accumulate on the wall surface near the nozzle hole outlet in this way even if a command for injecting the desired amount of fuel to the fuel injection valve is sent to the fuel injection valve, An amount of fuel may not be injected. If the desired amount of fuel is not injected from the fuel injection valve, the output characteristics and exhaust characteristics of the internal combustion engine may deteriorate.
- the amount of the combustion product deposited on the wall surface near the nozzle hole outlet (hereinafter referred to as “the combustion product deposited on the wall surface near the nozzle hole outlet”
- the deposit amount is referred to as “deposit accumulation amount” or more than a reference amount
- the fuel injection from the fuel injection valve is controlled so that the deposit is separated from the wall near the nozzle hole outlet. Yes.
- the deposit accumulation amount is used to determine whether or not the deposit should be peeled off from the wall surface near the nozzle hole outlet. Therefore, in the patent document, it is necessary to estimate the deposit accumulation amount.
- the amount of fuel actually injected from the fuel injection valve is referred to as an actual fuel injection amount
- the amount required as fuel to be injected from the fuel injection valve is referred to as a required fuel injection amount
- the deposit accumulation amount is zero.
- a command value given to the fuel injection valve to inject the fuel of the required fuel injection amount from the fuel injection valve is referred to as a fuel injection command value
- deposit is accumulated on the wall near the nozzle hole outlet in Patent Document 1.
- the actual fuel injection amount becomes smaller than the required fuel injection amount, and the actual fuel injection amount becomes smaller than the required fuel injection amount because the actual fuel injection amount becomes smaller than the required fuel injection amount as the deposit amount increases.
- the deposit accumulation amount is estimated based on the difference between the actual fuel injection amount and the required fuel injection amount. In this case, it is estimated that the larger the difference between the actual fuel injection amount and the required fuel injection amount, the larger the deposit accumulation amount.
- the fuel injection pressure (that is, the pressure of the fuel when the fuel is injected from the fuel injection valve) is relatively high when the deposit is deposited on the wall near the injection hole outlet, and the fuel
- the injection amount that is, the amount of fuel injected from the fuel injection valve
- the actual fuel injection amount is not smaller than the required fuel injection amount, but the actual fuel injection amount is smaller than the required fuel injection amount. It says that it will increase. That is, Patent Document 2 suggests that the actual fuel injection amount may not be less than the required fuel injection amount even if deposits are accumulated on the wall surface near the nozzle hole outlet depending on the operating state of the internal combustion engine. Yes. In such a case, even if the deposit accumulation amount is estimated by the method described in Patent Document 1, the deposit accumulation amount cannot be estimated accurately.
- an object of the present invention is to accurately estimate the deposit accumulation amount when the actual fuel injection amount is not smaller than the required fuel injection amount even if the deposit is accumulated on the wall surface near the nozzle hole outlet.
- the invention of the present application relates to an internal combustion engine provided with a fuel injection valve, an injection hole defining wall that is a wall defining a fuel injection hole of the fuel injection valve, and a wall other than the injection hole defining wall, Deposited on the wall surface of the fuel injection valve in the vicinity of the inlet of the fuel injection hole and on the wall surface of the injection hole composed of at least one of the wall surfaces of the fuel injection valve in the vicinity of the outlet of the fuel injection hole.
- the present invention relates to a deposit accumulation amount estimation device that estimates a deposit accumulation amount by calculating a deposit accumulation amount that is an amount of deposits.
- the amount of fuel actually injected from the fuel injection valve is referred to as the actual fuel injection amount
- the amount required as the amount of fuel injected from the fuel injection valve is referred to as the required fuel injection amount
- the deposit accumulation amount is zero.
- a command value given to the fuel injection valve in order to inject fuel of a required fuel injection amount from the fuel injection valve at a certain time is called a fuel injection command value
- a required fuel smaller than a predetermined amount is used.
- An increase determination is performed to determine whether or not the actual fuel injection amount when the fuel injection command value corresponding to the injection amount is given to the fuel injection valve is larger than the corresponding required fuel injection amount.
- the deposit accumulation amount is estimated based on the difference between the actual fuel injection amount and the corresponding required fuel injection amount.
- the deposit accumulation amount can be accurately estimated when the actual fuel injection amount is not smaller than the required fuel injection amount even if the deposit is accumulated on the wall surface of the nozzle hole. That is, if the required fuel injection amount is relatively large when deposits are deposited on the wall surface of the nozzle hole (that is, if the required fuel injection amount is larger than a predetermined amount as an appropriate amount), the actual fuel injection amount becomes the required fuel injection amount. Less than. However, if the required fuel injection amount is relatively small when deposit is deposited on the wall surface of the nozzle hole (that is, less than the predetermined amount), the actual fuel injection amount is larger than the required fuel injection amount. Become. Therefore, this should be considered in order to accurately estimate the deposit amount.
- the deposit accumulation amount is estimated in consideration of this. Therefore, according to the present invention, even if deposits are accumulated on the wall surface of the nozzle hole, the deposit accumulation amount can be accurately estimated when the actual fuel injection amount is not smaller than the required fuel injection amount. .
- the fuel injection valve may be any fuel injection valve as long as deposits may accumulate on the wall surface of the injection hole.
- fuel can be directly injected into the combustion chamber of the internal combustion engine.
- the tip of the fuel injection valve may be a fuel injection valve whose tip is exposed in the combustion chamber (a so-called in-cylinder fuel injection valve), or the tip may be injected so that fuel can be injected into the intake port of the internal combustion engine.
- a fuel injection valve of a type exposed in the intake port (a so-called port injection type fuel injection valve) may be used.
- a parameter representing this difference may be used for estimating the deposit accumulation amount. For example, a fuel cut in which fuel injection for injecting fuel from a fuel injection valve at a timing for generating torque is prohibited over a plurality of operating cycles of the internal combustion engine is performed, and the torque is reduced during the period during which the fuel cut is performed.
- a fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve Is referred to as a reference torque
- the difference between the actual torque applied to the fuel injection valve and the reference torque is the difference between the actual fuel injection amount and the corresponding required fuel injection amount. It may be used for estimation of the deposit amount as a difference.
- the deposit accumulation amount is estimated based on the difference between the reference torque and the actual torque.
- the actual torque at this time is the period during which the fuel cut is performed.
- a torque at the time of fuel injection in which fuel of a required fuel injection amount smaller than the predetermined amount is injected from the fuel injection valve (hereinafter, this fuel injection is referred to as “micro fuel injection”).
- this fuel injection is referred to as “micro fuel injection”.
- the minute fuel injection is performed during the fuel cut period, and during this period, the torque other than the torque generated by the combustion of the minute fuel is zero. Therefore, it is easy to grasp the torque generated by the combustion of the minute fuel. Therefore, when the deposit accumulation amount is estimated based on the difference between the reference torque and the actual torque, the deposit accumulation amount can be accurately estimated.
- the fuel cut is performed in which fuel injection for injecting fuel from the fuel injection valve at the timing of generating torque is prohibited over a plurality of operation cycles of the internal combustion engine.
- the fuel cut is performed.
- the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve at the timing of generating the torque during the period, the actual fuel injection amount becomes equal to the required fuel injection amount.
- the torque is a torque when the minute fuel injection is performed.
- the amount of fuel (that is, minute fuel) injected from the fuel injection valve by this minute fuel injection is relatively small (that is, smaller than the above-mentioned predetermined amount)
- the generated torque is also small.
- torque is generated in addition to the torque generated by the combustion of the minute fuel, it is difficult to grasp the torque generated by the combustion of the minute fuel.
- the minute fuel injection is performed during the fuel cut period, and during this period, the torque other than the torque generated by the combustion of the minute fuel is zero. Therefore, it is easy to grasp the torque generated by the combustion of the minute fuel. Therefore, it can be accurately determined whether the actual fuel injection amount is larger than the corresponding required fuel injection amount based on the reference torque and the actual torque.
- the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve at the timing of generating the torque at the time, the actual fuel injection amount matches the required fuel injection amount.
- the torque generated when the fuel is cut is referred to as a reference torque
- the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount at the timing of generating the torque during the period when the fuel cut is performed is The requirement less than the predetermined amount based on the difference between the actual torque applied to the fuel injector and the reference torque.
- a correction value for correcting the fuel injection command value is learned so that the actual fuel injection amount when the fuel injection command value corresponding to the fuel injection amount is given to the fuel injection valve matches the required fuel injection amount.
- the learned correction value may be used for estimating the deposit accumulation amount as a difference between the actual fuel injection amount and the corresponding required fuel injection amount.
- the deposit amount is estimated based on the learned correction value, and this correction value is learned based on the difference between the reference torque and the actual torque.
- the actual torque is a fuel injection that causes the fuel injection valve to inject a fuel having a required fuel injection amount that is smaller than the predetermined amount (hereinafter, this fuel injection is referred to as “micro fuel injection”). ”)" Is performed.
- this fuel is referred to as “micro fuel”.
- micro fuel since the amount of fuel injected from the fuel injection valve by this micro fuel injection (hereinafter, this fuel is referred to as “micro fuel”) is relatively small (that is, smaller than the predetermined amount), The torque generated by the minute fuel combustion is also small.
- the minute fuel injection is performed during the fuel cut period, and during this period, the torque other than the torque generated by the combustion of the minute fuel is zero. Therefore, it is easy to grasp the torque generated by the combustion of the minute fuel. Therefore, when the correction value is learned based on the difference between the reference torque and the actual torque, the correction value can be learned accurately, and thus the deposit accumulation amount can be estimated accurately.
- the increase determination includes the actual fuel injection amount when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve, and the corresponding required fuel injection amount. As long as it is performed based on this, it may be performed in connection with any fuel injection. In this regard, a fuel cut is performed in which fuel injection for injecting fuel from the fuel injection valve at a timing for generating torque is prohibited over a plurality of operating cycles of the internal combustion engine, and during the period in which the fuel cut is being performed. When the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve at the timing of generating the torque, the actual fuel injection amount matches the required fuel injection amount.
- the torque generated in this case is referred to as a reference torque
- the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount at the timing of generating the torque during the period when the fuel cut is performed is the fuel.
- the demanded fuel less than the predetermined amount based on a difference between an actual torque applied to the injection valve and the reference torque
- a correction value for correcting the fuel injection command value is learned so that the actual fuel injection amount when the fuel injection command value corresponding to the injection amount is given to the fuel injection valve matches the required fuel injection amount.
- the fuel injection valve is a fuel injection valve that directly injects fuel into the combustion chamber of the internal combustion engine, and the fuel is injected at a timing at which torque can be generated during one operation cycle of the internal combustion engine.
- the actual fuel injection amount by the sub fuel injection and the sub fuel when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve when the fuel injection is performed
- the difference between the required fuel injection amount for injection is used to estimate the deposit amount as the difference between the actual fuel injection amount and the corresponding required fuel injection amount. It may be.
- the required fuel injection amount smaller than the predetermined amount is estimated from the fuel injection valve for the purpose of estimating the deposit accumulation amount although the required fuel injection amount is equal to or larger than the predetermined amount. If injected, the performance of the internal combustion engine will deteriorate. On the other hand, if an attempt is made to minimize the deterioration of the performance of the internal combustion engine, the chance that the fuel injection amount less than the predetermined amount is injected from the fuel injection valve is reduced. In this case, the frequency of estimating the deposit accumulation amount becomes low.
- the deposit accumulation amount is estimated in relation to the sub fuel injection performed for the purpose other than the estimation of the deposit accumulation amount, the amount is forcibly set in advance for the purpose of estimating the deposit accumulation amount. Therefore, it is not necessary to inject a small required fuel injection amount from the fuel injection valve. Since the performance of the sub fuel injection does not degrade the performance of the internal combustion engine, even if the deposit accumulation amount is estimated every time the sub fuel injection is performed, the performance of the internal combustion engine is not degraded. Absent. For this reason, since the deposit accumulation amount is estimated in relation to the sub fuel injection, the deposit accumulation amount can be estimated at a higher frequency while maintaining the performance of the internal combustion engine high. is there.
- the increase determination includes the actual fuel injection amount when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve, and the corresponding required fuel injection amount.
- the fuel injection valve is a fuel injection valve that directly injects fuel into the combustion chamber of the internal combustion engine, and fuel is supplied from the fuel injection valve at a timing at which torque can be generated during one operation cycle of the internal combustion engine.
- the sub fuel When the main fuel injection to be injected and the sub fuel injection in which fuel is injected from the fuel injection valve at a timing that does not generate torque and before the execution timing of the main fuel injection are performed, the sub fuel The actual fuel injection amount by the sub fuel injection and the sub fuel injection when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve when the injection is performed Preferably, the increase determination is made based on the required fuel injection amount.
- the required fuel injection amount is smaller than the predetermined amount for the purpose of performing the increase determination, the required fuel injection amount is normally injected from the fuel injection valve even though the required fuel injection amount is equal to or larger than the predetermined amount.
- the performance of the internal combustion engine will deteriorate.
- the chance that the fuel injection amount less than the predetermined amount is injected from the fuel injection valve is reduced. In this case, the frequency of performing the increase determination is reduced.
- the increase determination is performed in connection with the sub fuel injection performed for the purpose other than the increase determination, the required fuel injection amount that is less than a predetermined amount is forcibly injected for the purpose of performing the increase determination. There is no need to inject from the valve. Since the performance of the sub fuel injection does not deteriorate the performance of the internal combustion engine, the performance of the internal combustion engine does not deteriorate even if the increase determination is made every time the sub fuel injection is performed. For this reason, by performing the increase determination in relation to the sub fuel injection, the increase determination is performed at a higher frequency while maintaining the performance of the internal combustion engine at a higher frequency, and as a result, the deposit accumulation amount is estimated. It can be done.
- the sub fuel injection is performed at a timing prior to the execution timing of the main fuel injection and does not generate torque, and a fuel having a required fuel injection amount smaller than the predetermined amount.
- any fuel injection may be used, for example, so-called pilot fuel injection or so-called pre-fuel injection may be used.
- the fuel injection valve is a fuel injection valve that directly injects fuel into the combustion chamber of the internal combustion engine, and the fuel is injected at a timing at which torque can be generated during one operation cycle of the internal combustion engine.
- the actual fuel injection amount by the sub fuel injection and the sub fuel when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve when the fuel injection is performed
- the difference between the required fuel injection amount for injection is used to estimate the deposit amount as the difference between the actual fuel injection amount and the corresponding required fuel injection amount. It may be.
- the required fuel injection amount smaller than the predetermined amount is estimated from the fuel injection valve for the purpose of estimating the deposit accumulation amount although the required fuel injection amount is equal to or larger than the predetermined amount. If injected, the performance of the internal combustion engine will deteriorate. On the other hand, if an attempt is made to minimize the deterioration of the performance of the internal combustion engine, the chance that the fuel injection amount less than the predetermined amount is injected from the fuel injection valve is reduced. In this case, the frequency of estimating the deposit accumulation amount becomes low.
- the deposit accumulation amount is estimated in relation to the sub fuel injection performed for the purpose other than the estimation of the deposit accumulation amount, the amount is forcibly set in advance for the purpose of estimating the deposit accumulation amount. Therefore, it is not necessary to inject a small required fuel injection amount from the fuel injection valve. Since the performance of the sub fuel injection does not degrade the performance of the internal combustion engine, even if the deposit accumulation amount is estimated every time the sub fuel injection is performed, the performance of the internal combustion engine is not degraded. Absent. Therefore, by estimating the deposit accumulation amount in relation to the sub fuel injection, it is possible to make an increase determination with a higher frequency while maintaining the performance of the internal combustion engine high.
- the increase determination includes the actual fuel injection amount when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve, and the corresponding required fuel injection amount.
- the fuel injection valve is a fuel injection valve that directly injects fuel into the combustion chamber of the internal combustion engine, and fuel is supplied from the fuel injection valve at a timing at which torque can be generated during one operation cycle of the internal combustion engine. In the case where the main fuel injection to be injected and the sub fuel injection in which the fuel is injected from the fuel injection valve at a timing that does not generate torque and is later than the execution timing of the main fuel injection are performed.
- the actual fuel injection amount by the sub fuel injection and the sub fuel injection when the fuel injection command value corresponding to the required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve when the injection is performed
- the increase determination is made based on the required fuel injection amount.
- the required fuel injection amount is smaller than the predetermined amount for the purpose of performing the increase determination, the required fuel injection amount is normally injected from the fuel injection valve even though the required fuel injection amount is equal to or larger than the predetermined amount.
- the performance of the internal combustion engine will deteriorate.
- the chance that the fuel injection amount less than the predetermined amount is injected from the fuel injection valve is reduced. In this case, the frequency of performing the increase determination is reduced.
- the increase determination is performed in connection with the sub fuel injection performed for the purpose other than the increase determination, the required fuel injection amount that is less than a predetermined amount is forcibly injected for the purpose of performing the increase determination. There is no need to inject from the valve. Since the performance of the sub fuel injection does not deteriorate the performance of the internal combustion engine, the performance of the internal combustion engine does not deteriorate even if the increase determination is made every time the sub fuel injection is performed. For this reason, by performing the increase determination in connection with the sub fuel injection, the increase determination is performed at a higher frequency while maintaining the performance of the internal combustion engine at a higher frequency, and as a result, the deposit accumulation amount is estimated. It can be carried out.
- the sub fuel injection is performed at a timing later than the execution timing of the main fuel injection and does not generate torque, and a fuel having a required fuel injection amount smaller than the predetermined amount.
- any fuel injection may be used, for example, so-called after fuel injection or so-called post fuel injection.
- the deposit accumulation amount may be estimated only when a fuel injection command value corresponding to a required fuel injection amount smaller than the predetermined amount is given to the fuel injection valve.
- the deposit accumulation amount may be estimated not only when the fuel injection command value corresponding to the required fuel injection amount smaller than the above amount is given to the fuel injection valve but also at other times.
- whether or not the actual fuel injection amount when the fuel injection command value corresponding to the required fuel injection amount equal to or greater than the predetermined amount is given to the fuel injection valve is smaller than the corresponding required fuel injection amount. Is determined, and when it is determined that the actual fuel injection amount is smaller than the corresponding required fuel injection amount in the decreasing determination, the difference between the actual fuel injection amount and the corresponding required fuel injection amount is determined. It is preferable that the deposit amount is estimated based on the difference.
- the deposit accumulation amount is estimated not only when the increase determination is performed but also when the decrease determination is performed, the deposit can be estimated more frequently.
- FIG. 1 10 is a main body of the internal combustion engine, 11 is a cylinder block, and 12 is a cylinder head.
- a cylinder bore 13 is formed in the cylinder block 11.
- a piston 14 is disposed in the cylinder bore 13.
- the piston 14 is connected to the crankshaft 16 via a connecting rod 15.
- an intake port 17 and an exhaust port 18 are formed in the cylinder head 12.
- the cylinder head 12 is also provided with an intake valve 19 for opening and closing the intake port 17 and an exhaust valve 20 for opening and closing the exhaust port 18.
- a combustion chamber 21 is defined by the upper wall surface of the piston 14, the inner peripheral wall surface of the cylinder bore 13, and the lower wall surface of the cylinder head 12.
- the intake port 17 is connected to an intake pipe (not shown) via an intake manifold (not shown) and constitutes a part of the intake passage.
- the exhaust port 18 is connected to an exhaust pipe (not shown) via an exhaust manifold (not shown) and constitutes a part of the exhaust passage.
- a fuel injection valve 22 is disposed on the cylinder head 12.
- the fuel injection valve 22 has a nozzle 30 and a needle 31.
- a cavity (hereinafter referred to as “internal cavity”) is formed inside the nozzle 30.
- the needle 31 is accommodated so that the movement along the center axis line (namely, center axis line of the fuel injection valve 22) CA of the nozzle 30 is possible.
- the tip of the needle 31 is tapered.
- the fuel passage 32 at the tip of the nozzle 30 forms a so-called sac 33 (hereinafter, the fuel passage 32 means a fuel passage excluding the sack 33). Furthermore, a plurality of fuel injection holes 34 are formed at the tip of the nozzle 30. These fuel injection holes 34 communicate between the sac 33 in the nozzle 30 (that is, in the fuel injection valve 22) and the outside of the nozzle 30 (that is, outside the fuel injection valve 22).
- the gap between the suck 33 and the fuel passage 32 is set. Communication is interrupted. At this time, fuel is not injected from the fuel injection hole 34 of the fuel injection valve 22.
- the needle 31 is moved in the nozzle 30 so that the outer peripheral wall surface of the tapered tip portion of the needle 31 is separated from the inner peripheral wall surface of the nozzle 30, the sac 33 and the fuel passage 32 communicate with each other. The fuel flows into the fuel passage 32 or the sac 33. The fuel that has flowed into the sac 33 flows into the fuel injection hole 34 through the inlet of the fuel injection hole 34 and is injected from the outlet through the fuel injection hole 34.
- the fuel injection valve 22 is disposed in the cylinder head 12 so as to inject fuel directly into the combustion chamber 21.
- the fuel injection valve 22 is arranged in the cylinder head 12 so that the fuel injection hole is exposed in the combustion chamber 21.
- the fuel injection valve 22 is connected to a pressure accumulating chamber (that is, a so-called common rail) 24 via a fuel supply passage 23.
- the pressure accumulating chamber 24 is connected to a fuel tank (not shown) via a fuel supply passage 25. Fuel is supplied to the pressure accumulating chamber 24 from a fuel tank through a fuel supply passage 25. A high-pressure fuel is stored in the pressure accumulating chamber 24. Further, high pressure fuel is supplied to the fuel injection valve 22 from the pressure accumulation chamber 24 through the fuel supply passage 23.
- the pressure accumulating chamber 24 is provided with a pressure sensor 26 for detecting the pressure of the fuel inside.
- a cooling water passage 27 for flowing cooling water is formed in the cylinder block 11.
- the cooling water passage 27 is formed so as to surround the cylinder bore 13. Therefore, at least the inside of the combustion chamber 21 is cooled by the cooling water flowing in the cooling water passage 27.
- the cylinder block 11 is provided with a temperature sensor 28 for detecting the temperature of the cooling water flowing in the cooling water passage 27.
- the internal combustion engine has an electronic control unit 40.
- the electronic control unit 40 includes a microcomputer, and is connected to each other by a bidirectional bus 41.
- a CPU (microprocessor) 42, a ROM (read only memory) 43, a RAM (random access memory) 44, a backup RAM 45, and an interface 46 are connected.
- Have The interface 46 is connected to the fuel injection valve 22, the pressure sensor 26, and the temperature sensor 28.
- the electronic control unit 40 controls the operation of the fuel injection valve 22, receives an output value corresponding to the fuel pressure from the pressure sensor 26, and receives an output value corresponding to the coolant temperature from the temperature sensor 28.
- the injection hole defining wall surface is “the fuel injection valve wall surface defining the fuel injection hole of the fuel injection valve”
- the injection hole inlet near wall surface is “the fuel injection hole of the fuel injection valve”.
- the fuel injection valve wall surface adjacent to the nozzle hole defining wall in the vicinity of the inlet of the fuel injection port, and the “wall surface near the nozzle hole outlet” in the vicinity of the outlet of the fuel injection hole of the fuel injection valve The valve wall.
- Combustion products are “substances generated in connection with fuel combustion”
- combustion gas is “gas generated by burning fuel in the combustion chamber”
- fuel injection Is “injection of fuel from the fuel injection hole of the fuel injection valve”
- fuel injection pressure is “pressure of fuel injected from the fuel injection hole of the fuel injection valve”
- injection hole temperature is “ The temperature inside the fuel injection hole of the fuel injection valve ”.
- the fuel injection valve when the fuel injection valve is arranged in the internal combustion engine so that the fuel injection valve directly injects the fuel into the combustion chamber, that is, the fuel injection hole of the fuel injection valve is exposed in the combustion chamber, Enters the fuel injection hole, and this combustion gas reacts with the fuel in the fuel injection hole and in the vicinity of the inlet to produce a metal-derived product.
- the adhesion force of the metal-derived product to the wall surface is relatively strong, the injection hole defining wall and the wall near the injection hole inlet despite the strong fuel flow in the fuel injection hole and the inlet thereof. Adhere to and deposit. This is presumably the reason why the metal-derived products are deposited on the wall defining the nozzle hole and the wall near the nozzle hole entrance.
- combustion products including metal-derived products (hereinafter referred to as “hole wall”) in the vicinity of the nozzle hole outlet wall, the nozzle hole defining wall, and the nozzle hole inlet wall (hereinafter referred to as “hole wall”).
- the combustion product contains a metal-derived product
- the combustion product deposited on the nozzle hole wall hereinafter, deposited on the nozzle hole wall in this way
- Combustion products called “deposits” impede fuel flow. Therefore, even if a command value that can cause the fuel injection valve to inject the fuel that is originally required (hereinafter, this amount is referred to as “required fuel injection amount”) to the fuel injection valve is required. There is a possibility that the fuel injection amount of fuel is not injected from the fuel injection valve.
- the output characteristics and exhaust characteristics of the internal combustion engine may deteriorate. Therefore, it is indispensable to know whether or not there is a possibility that such deterioration of the internal combustion engine's output characteristics and exhaust characteristics will be suppressed or improved, and such characteristics may be deteriorated. Knowing the presence or absence of sex is not a little useful. In order to know whether or not there is a possibility that such a characteristic will be deteriorated, it is necessary to accurately know the amount of deposit deposited on the wall surface of the nozzle hole (this amount is hereinafter referred to as “deposit accumulation amount”). .
- the actual fuel injection amount that is, the amount of fuel actually injected from the fuel injection valve
- the required fuel injection amount that is, from the fuel injection valve
- the fuel injection amount is compared. In the case of a large amount, if the deposit is accumulated on the wall surface of the nozzle hole, the actual fuel injection amount becomes smaller than the required fuel injection amount.
- the fuel injection amount is relatively small (particularly when the fuel injection amount is very small)
- the actual fuel injection amount may be less than the required fuel injection amount. On the contrary, it increases.
- the pressure of the fuel in the sac of the fuel injection valve increases as the amount of fuel that can pass through the fuel injection hole decreases.
- the increase in fuel pressure in the sac causes the valve opening speed of the needle of the fuel injection valve (that is, the needle so that the outer wall surface of the tapered tip of the needle is separated from the inner peripheral wall of the nozzle tip). (Moving speed) becomes faster.
- a fuel injection period (that is, a period during which fuel is injected from the fuel injection hole, and corresponds to a period in which the outer wall surface of the tapered tip of the needle is separated from the inner wall surface of the nozzle tip. ) Is a little longer.
- the fuel injection period is relatively long. Therefore, it is better to reduce the amount of fuel passing through the fuel injection holes than to extend the fuel injection period due to the increase in fuel pressure in the sack. It is dominant to the fuel injection amount.
- deposits are accumulated on the wall surface of the nozzle hole when the fuel injection amount is relatively large, it is presumed that the actual fuel injection amount becomes smaller than the required fuel injection amount.
- the fuel injection period is relatively short. Therefore, the fuel injection period is longer due to the increase in the pressure of the fuel in the sack than the fuel quantity passing through the fuel injection amount is reduced. It is dominant to the fuel injection amount. As a result, when deposits are accumulated on the wall surface of the injection hole when the fuel injection amount is relatively small, it is assumed that the actual fuel injection amount becomes larger than the required fuel injection amount.
- the deposit accumulation amount must be estimated in consideration of the fact that the actual fuel injection amount is larger than the required fuel injection amount. Therefore, the deposit amount cannot be estimated accurately.
- the deposit accumulation amount is estimated using the torque difference during execution of the minute fuel injection. That is, in the first embodiment, fuel cut is performed to prohibit fuel injection (that is, fuel injection from the fuel injection valve) when the accelerator pedal depression amount becomes zero (that is, during so-called deceleration). While the fuel cut is being executed, fuel injection is prohibited.
- one operation cycle of the internal combustion engine that is, four strokes of an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke). 1 minute operation injection), minute fuel injection for injecting a small amount of fuel from the fuel injection valve is executed.
- a command value (hereinafter referred to as a command value) to be given to the fuel injection valve in order to cause the fuel injection valve to inject the required fuel injection amount when no deposit is deposited on the wall surface of the injection hole. (Referred to as “fuel injection command value”) for each required fuel injection amount.
- fuel injection command value for each required fuel injection amount.
- the fuel injection command value corresponding to the required fuel injection amount is obtained by using a minute amount as the required fuel injection amount Given to.
- timing at which fuel is injected from the fuel injection valve in the minute fuel injection is set to the timing at which the fuel burns so as to generate torque.
- the required fuel injection amount in the minute fuel injection is such that the actual fuel injection amount is determined when deposits are accumulated on the injection hole wall surface when the fuel injection command value corresponding to the required fuel injection amount is given to the fuel injection valve. Any amount may be used as long as it is greater than the required fuel injection amount. That is, when a fuel injection command value corresponding to the required fuel injection amount is given to the fuel injection valve, if the deposit is accumulated on the wall surface of the injection hole, the actual fuel injection amount becomes larger than the required fuel injection amount. Assuming that the largest required fuel injection amount among the required fuel injection amounts is a “predetermined amount”, the required fuel injection amount in the minute fuel injection is any amount as long as it is equal to or less than the predetermined amount. May be.
- the fuel injection amount is preferably the smallest amount of fuel that can be injected from the fuel injection valve.
- the torque generated by the combustion of the fuel injected by the minute fuel injection is obtained in advance by experiments or the like.
- the obtained torque is stored in the electronic control device as a reference torque.
- the minute fuel injection is executed during the fuel cut, the torque generated by the combustion of the fuel injected by the minute fuel injection is detected (hereinafter, this torque is referred to as “detected torque”).
- this torque is referred to as “detected torque”.
- the actual fuel injection amount in the minute fuel injection is larger than the required fuel injection amount.
- the detection is performed by subtracting the reference torque from the detected torque.
- a difference between the torque and the reference torque is calculated as a torque difference.
- the difference between the actual fuel injection amount and the required fuel injection amount based on the calculated torque difference (this difference corresponds to a value obtained by subtracting the required fuel injection amount from the actual fuel injection amount, This is referred to as “increase in fuel injection amount”). Note that the increase in the fuel injection amount calculated here is larger as the torque difference is larger.
- the deposit accumulation amount corresponding to the increase in the fuel injection amount when the actual fuel injection amount is larger than the required fuel injection amount when the minute fuel injection is executed is obtained in advance by experiments or the like.
- the determined deposit accumulation amount Xd is stored in the electronic control unit in the form of a map of a function of the fuel injection amount increase ⁇ Qi.
- the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the fuel injection amount increase ⁇ Qi calculated when the minute fuel injection is executed.
- the deposit accumulation amount Xd calculated here is larger as the fuel injection amount increase ⁇ Qi is larger.
- the deposit accumulation amount is calculated in consideration of this. Therefore, according to the first embodiment, the deposit accumulation amount is accurately calculated.
- a map for calculating the deposit accumulation amount a map for calculating the deposit accumulation amount based on the increase amount ⁇ Qi of the fuel injection amount is prepared. After converting into the increase amount ⁇ Qi, the deposit accumulation amount is calculated using the increase amount ⁇ Qi of the fuel injection amount.
- a map for calculating the deposit accumulation amount based on the torque difference may be prepared as a map for calculating the deposit accumulation amount, and the deposit accumulation amount may be directly calculated using the torque difference. Therefore, in the first embodiment, it can be said that the deposit accumulation amount is calculated based on the increase in the fuel injection amount in the minute fuel injection, and the deposit accumulation amount is calculated based on the torque difference in the minute fuel injection. It can be said that it is.
- the detected torque is a torque corresponding to the actual fuel injection amount in the minute fuel injection
- the reference torque is a torque corresponding to the required fuel injection amount in the minute fuel injection. From this, in the first embodiment, it can be said that it is determined whether or not the actual fuel injection amount is larger than the required fuel injection amount when the minute fuel injection is executed.
- This routine is shown in FIG.
- the routine of FIG. 4 is executed every time a predetermined time elapses.
- the fuel cut flag Ffc is set when the fuel cut is started, and is reset when the deposit accumulation amount is calculated by the routine of FIG.
- step 100 minute fuel injection is executed.
- step 102 the torque TQ is detected.
- step 103 it is judged if the torque (ie, detected torque) TQ detected at step 102 is larger than the reference torque TQst (TQ> TQst).
- TQ> TQst that is, when the actual fuel injection amount is larger than the required fuel injection amount, a torque larger than the reference torque is generated
- the routine performs step. Proceed to 104.
- TQ ⁇ TQst the routine ends as it is.
- step 104 the fuel injection amount is increased based on the difference between the torque TQ detected in step 102 and the reference torque TQst (ie, torque difference). ⁇ Qi is calculated.
- step 105 the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the fuel injection amount increase ⁇ Qi calculated at step 104.
- step 106 the fuel cut flag Ffc is reset (Ffc ⁇ 0), and the routine ends.
- the deposit accumulation amount is estimated using the learning correction value learned by the minute fuel injection amount learning.
- the estimation of the deposit accumulation amount will be described.
- the minute fuel injection amount learning will be described.
- the fuel cut is performed when the accelerator pedal depression amount becomes zero. While the fuel cut is being executed, the fuel injection is prohibited. On the contrary, the same minute fuel injection as that of the first embodiment is executed during one operation cycle of the internal combustion engine.
- the torque generated by the combustion of the fuel injected by the minute fuel injection is obtained by experiments or the like.
- the obtained torque is stored in the electronic control unit as a reference torque.
- the minute fuel injection is executed during the fuel cut, the torque generated by the combustion of the fuel injected by the minute fuel injection is detected (hereinafter, this torque is referred to as “detected torque”).
- a difference between the detected torque and the reference torque is calculated as a torque difference by subtracting the reference torque from the detected torque.
- the torque difference is greater than zero, the actual fuel injection amount is greater than the required fuel injection amount. Therefore, in order to make the actual fuel injection amount coincide with the required fuel injection amount, the fuel corresponding to the required fuel injection amount It is necessary to shorten the fuel injection period (that is, the period during which fuel is injected from the fuel injection hole) by correcting the fuel injection command value so that the injection command value becomes smaller. Therefore, when the torque difference is larger than zero, a correction value for reducing the fuel injection command value is calculated, and the calculated correction value is updated at the previous execution of the minute fuel injection amount learning and stored in the electronic control unit.
- the learning correction value is updated by being added to the learning correction value (that is, learned), and is stored as a new learning correction value in the electronic control unit (that is, learned).
- a correction value larger than zero is calculated. Therefore, the learning correction value is increased by adding the correction value to the learning correction value.
- the torque difference is smaller than zero, the actual fuel injection amount is smaller than the required fuel injection amount. Therefore, in order to make the actual fuel injection amount coincide with the required fuel injection amount, the fuel corresponding to the required fuel injection amount It is necessary to lengthen the fuel injection period by correcting the fuel injection command value so that the injection command value becomes large. Therefore, when the torque difference is smaller than zero, a correction value for increasing the fuel injection command value is calculated, and the calculated correction value is updated at the previous execution of the minute fuel injection amount learning and stored in the electronic control unit.
- the learning correction value is updated by being added to the learning correction value (that is, learned), and is stored as a new learning correction value in the electronic control unit (that is, learned).
- a correction value smaller than zero is calculated. Therefore, the learning correction value is reduced by adding the correction value to the learning correction value.
- the fuel injection command value is corrected by subtracting the learning correction value from the fuel injection command value corresponding to the required fuel injection amount, and the corrected fuel injection command value Is provided to the fuel injector. According to this, when the required fuel injection amount is relatively small, the actual fuel injection amount can be matched with the required fuel injection amount.
- the actual fuel injection amount is larger than the required fuel injection amount.
- the torque difference when the minute fuel injection is executed is larger than zero, that is, the actual fuel injection amount when the minute fuel injection is executed is the required fuel. If it is larger than the injection amount, a correction value greater than zero is calculated, and this correction value is added to the learning correction value.
- the learning correction value when the learning correction value is a value larger than zero, when the fuel injection command value corresponding to the required fuel injection amount is given to the fuel injection valve in the minute fuel injection, the actual fuel injection amount becomes smaller than the required fuel injection amount. Become more. That is, when the learning correction value is a value larger than zero, the deposit is deposited on the nozzle hole wall surface.
- the difference between the actual fuel injection amount and the required fuel injection amount that is, the increase in the fuel injection amount
- the learning correction value when the learning correction value is learned by the minute fuel injection amount learning, the learned learning correction value is acquired. Then, it is determined whether or not the learning correction value is greater than zero.
- the learning correction value when it is determined that the learning correction value is larger than zero, the actual fuel injection amount in the minute fuel injection is larger than the required fuel injection amount. Further, in the minute fuel injection, a relatively small amount of fuel is injected from the fuel injection valve. Therefore, when the actual fuel injection amount is larger than the required fuel injection amount, deposits are accumulated on the wall surface of the injection hole. Become. Therefore, in the first embodiment, when the learning correction value is larger than zero, it is determined that the deposit is accumulated on the wall surface of the nozzle hole.
- the fuel injection amount is increased based on the learning correction value.
- the minute (this corresponds to a value obtained by subtracting the required fuel injection amount from the actual fuel injection amount) is calculated. Note that the increase in the fuel injection amount calculated here is larger as the learning correction value is larger.
- the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the increase ⁇ Qi of the fuel injection amount thus calculated. The deposit accumulation amount Xd calculated here is larger as the fuel injection amount increase ⁇ Qi is larger.
- the deposit accumulation amount is calculated in consideration of this. Therefore, according to the second embodiment, the deposit accumulation amount is accurately calculated.
- a map for calculating the deposit accumulation amount based on the fuel injection amount increase ⁇ Qi is prepared as a map for calculating the deposit accumulation amount.
- the deposit accumulation amount is calculated using the increase amount ⁇ Qi of the fuel injection amount after being converted into the increase amount ⁇ Qi.
- a map for calculating the deposit accumulation amount based on the learning correction value may be prepared as a map for calculating the deposit accumulation amount, and the deposit accumulation amount may be directly calculated using the learning correction value. Therefore, in the second embodiment, it can be said that the deposit accumulation amount is calculated based on the increase in the fuel injection amount in the minute fuel injection, and the deposit accumulation amount is calculated based on the learning correction value. I can say that.
- the learning correction value is a value corresponding to the increase in the fuel injection amount. From this, it can be said that in the second embodiment, it is determined whether or not the actual fuel injection amount is larger than the required fuel injection amount when the minute fuel injection amount learning is executed.
- This routine is shown in FIG. Note that the routine of FIG. 5 is executed every time a predetermined time elapses.
- the fuel cut flag Ffc is set when the fuel cut is started, and is reset when the learning correction value is learned by the routine of FIG.
- step 20 minute fuel injection is executed.
- step 22 a torque difference ⁇ TQ is calculated.
- step 23 a correction value K is calculated based on the torque difference ⁇ TQ calculated at step 22.
- step 24 a new learning correction value KG is learned by adding the correction value K calculated in step 23 to the learning correction value learned in step 24 during the previous execution of the routine of FIG. .
- step 25 the fuel cut flag Ffc is reset (Ffc ⁇ 0), the learning completion flag Fkg used in the routine of FIG. 6 is set (Fkg ⁇ 1), and the routine ends.
- This routine is shown in FIG. Note that the routine of FIG. 6 is executed every time a predetermined time elapses.
- the learning completion flag Fkg is set when learning of the learning correction value is completed by the routine of FIG. 5 (specifically, in step 15 of the routine of FIG. 5), and the deposit accumulation amount is calculated by the routine of FIG. Then it is reset.
- Fkg 0, the routine ends as it is.
- step 202 it is judged if the learning correction value KG acquired at step 201 is larger than zero (KG> 0).
- KG> 0 that is, when the learning correction value is greater than zero because the actual fuel injection amount is larger than the required fuel injection amount
- the routine is performed. Proceeds to step 203.
- the routine ends as it is.
- step 202 When it is determined in step 202 that KG> 0 and the routine proceeds to step 203, the fuel injection amount increase amount ⁇ Qi is calculated based on the learning correction value KG acquired in step 201.
- step 204 the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the fuel injection amount increase ⁇ Qi calculated at step 203.
- step 205 the learning completion flag Fkg is reset (Fkg ⁇ 0), and the routine ends.
- the deposit accumulation amount is estimated using the particulate generation amount difference during the execution of pilot fuel injection.
- the estimation of the deposit amount will be described, but the pilot fuel injection will be described before the description.
- main fuel injection When fuel injection for injecting fuel from a fuel injection valve at a timing at which torque can be generated during one operation cycle of the internal combustion engine (for example, timing near compression top dead center) is referred to as “main fuel injection”
- the sub fuel injection in which the fuel is injected from the fuel injection valve at the timing before the execution timing of the main fuel injection and without generating the torque (this sub fuel injection is “pilot fuel”).
- pilot fuel A pilot fuel injection mode for performing “injection”.
- pilot fuel burns before the execution timing of the main fuel injection.
- main fuel the fuel injected from the fuel injection valve by the main fuel injection
- main fuel the main fuel injection
- main fuel the main fuel
- the amount of particulate produced due to the combustion of is reduced.
- the amount of particulates generated due to the operation state of the internal combustion engine for example, when improvement in ignitability of the main fuel is required or due to combustion of the main fuel is reduced).
- a pilot fuel injection mode is selected (when requested) and a pilot fuel injection is performed.
- the actual fuel injection amount is larger than the required fuel injection amount.
- the amount of pilot fuel that is, fuel injected from the fuel injection valve by pilot fuel injection
- the amount is very small. That is, it can be said that the pilot fuel injection is a minute fuel injection.
- the amount of particulates generated due to combustion of the main fuel that is, fuel injected from the fuel injection valve by main fuel injection
- this amount is referred to as “particulate generation”).
- the amount of particulate generation is smaller as the amount of pilot fuel is larger.
- the particulate generation amount when the actual fuel injection amount in the pilot fuel injection matches the required fuel injection amount is obtained in advance by experiments or the like, and the obtained particulate generation amount is the reference The amount of particulate generation is stored in the electronic control unit. Then, the particulate generation amount when the pilot fuel injection is executed is detected (hereinafter, this particulate generation amount is referred to as “detected particulate generation amount”). Then, it is determined whether or not the detected particulate generation amount is smaller than the reference particulate generation amount. Here, when it is determined that the detected particulate generation amount is smaller than the reference particulate generation amount, the actual fuel injection amount in the pilot fuel injection is larger than the required fuel injection amount.
- the reference particulate generation amount By subtracting the detected particulate generation amount from the difference, the difference between the reference particulate generation amount and the detected particulate generation amount is calculated as the particulate generation amount difference. Then, an increase in the fuel injection amount (this corresponds to a value obtained by subtracting the required fuel injection amount from the actual fuel injection amount) is calculated based on the calculated particulate generation amount difference. Note that the amount of increase in the fuel injection amount calculated here is larger as the particulate generation amount difference is larger.
- the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the fuel injection amount increase ⁇ Qi thus calculated.
- the deposit accumulation amount Xd calculated here is larger as the fuel injection amount increase ⁇ Qi is larger.
- the deposit accumulation amount is calculated in consideration of this. Therefore, according to the third embodiment, the deposit accumulation amount is accurately calculated.
- a map for calculating the deposit accumulation amount based on the fuel injection amount increase ⁇ Qi is prepared as a map for calculating the deposit accumulation amount. After converting into an increase amount ⁇ Qi of the injection amount, the deposit accumulation amount is calculated using the increase amount ⁇ Qi of the fuel injection amount.
- a map for calculating the deposit accumulation amount a map for calculating the deposit accumulation amount based on the particulate generation amount difference is prepared, and the deposit accumulation amount may be directly calculated using the particulate generation amount difference. Good. Therefore, in the third embodiment, it can be said that the deposit accumulation amount is calculated based on the increase in the fuel injection amount in the pilot fuel injection, and the deposit accumulation amount is calculated based on the particulate generation amount difference in the pilot fuel injection. It can also be said that is calculated.
- the detected particulate generation amount is a particulate generation amount corresponding to the actual fuel injection amount in pilot fuel injection
- the reference particulate generation amount is a particulate generation amount corresponding to the required fuel injection amount in pilot fuel injection.
- the amount of nitrogen oxide (NOx) generated due to combustion of the main fuel that is, fuel injected from the fuel injection valve by main fuel injection
- this amount is referred to as “NOx generation amount”.
- a sub fuel injection in which fuel is injected from the fuel injection valve at a timing before the execution timing of the main fuel injection and without generating torque this sub fuel injection is a so-called “pre-fuel injection”.
- the amount of fuel injected from the fuel injection valve by the pre-fuel injection is the actual fuel injection amount when the deposit is accumulated on the wall surface of the injection hole. Is an amount that is small enough to be greater than the required fuel injection amount.
- the pre-fuel injection is a minute fuel injection. Therefore, when the pre-fuel injection mode is prepared, in the third embodiment, instead of the particulate generation amount difference when the pilot fuel injection is performed, the difference in the NOx generation amount when the pre-fuel injection is performed is used.
- the deposit accumulation amount may be estimated.
- the NOx generation amount when the actual fuel injection amount in the pre-fuel injection matches the required fuel injection amount is obtained in advance by experiments or the like and stored in the electronic control unit.
- the reference NOx generation amount is used, and the NOx generation amount detected when pre-fuel injection is executed is used instead of the detected particulate generation amount.
- a NOx generation amount difference calculated by subtracting the detected NOx generation amount from the reference NOx generation amount is used instead of the particulate generation amount difference. Note that the increase in the fuel injection amount calculated based on the NOx generation amount difference is larger as the NOx generation amount difference is larger.
- the idea included in the third embodiment is a sub-fuel injection in which fuel is injected from the fuel injection valve at a timing that does not generate torque for a specific purpose before the execution timing of the main fuel injection. This is applicable when there is a parameter that correlates with the difference between the actual fuel injection amount and the required fuel injection amount in the sub fuel injection.
- This routine is shown in FIG. Note that the routine of FIG. 7 is executed every time a predetermined time elapses.
- the pilot fuel injection flag Fpl is set when the pilot fuel injection mode is selected, and is reset when the selection of the pilot fuel injection mode is cancelled.
- Fpl 0, the routine ends as it is.
- step 302 it is determined whether or not the particulate generation amount (ie, detected particulate generation amount) PM detected at step 301 is smaller than the reference particulate generation amount PMst (PM ⁇ PMst).
- PM ⁇ PMst the reference particulate generation amount
- the routine proceeds to step 303.
- the routine ends as it is.
- step 302 When it is determined in step 302 that PM ⁇ PMst and the routine proceeds to step 303, the difference between the particulate generation amount PM detected in step 301 and the reference particulate generation amount PMst (that is, the particulate generation amount). On the basis of the difference, an increase amount ⁇ Qi of the fuel injection amount is calculated.
- step 304 the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the fuel injection amount increase ⁇ Qi calculated in step 303, and the routine ends.
- the deposit accumulation amount is estimated using the catalyst temperature difference when the post fuel injection is performed.
- the estimation of the deposit amount will be described, but the post fuel injection will be described before the description.
- main fuel injection When fuel injection for injecting fuel from a fuel injection valve at a timing at which torque can be generated during one operation cycle of the internal combustion engine (for example, timing near compression top dead center) is referred to as “main fuel injection”
- a post fuel injection mode for executing (this sub fuel injection is “post fuel injection”) is prepared.
- the fuel injected from the fuel injection valve by the post fuel injection hereinafter, this fuel is referred to as “post fuel”) is discharged from the combustion chamber as it is into the exhaust passage without being combusted in the combustion chamber, and is disposed in the exhaust passage.
- a purification catalyst (not shown) is reached.
- the fuel that has reached the exhaust purification catalyst burns in the exhaust purification catalyst, whereby the temperature of the exhaust purification catalyst (hereinafter referred to as “catalyst temperature”) is raised.
- the post fuel injection mode is selected and post fuel injection is executed according to the operating state of the internal combustion engine (for example, when an increase in the catalyst temperature is requested).
- the actual fuel injection amount is larger than the required fuel injection amount.
- the amount of post fuel that is, fuel injected from the fuel injection valve by post fuel injection
- the amount is very small. That is, it can be said that the post fuel injection is a minute fuel injection.
- the catalyst temperature rises. The degree of increase in the catalyst temperature increases as the amount of post fuel increases.
- the catalyst temperature when the actual fuel injection amount in the post fuel injection coincides with the required fuel injection amount is obtained in advance by experiments or the like, and the obtained catalyst temperature is used as the reference catalyst temperature as an electronic value. It is stored in the control device. Then, the catalyst temperature when the post fuel injection is executed is detected (hereinafter, this catalyst temperature is referred to as “detected catalyst temperature”). Then, it is determined whether or not the detected catalyst temperature is higher than the reference catalyst temperature. Here, when it is determined that the detected catalyst temperature is higher than the reference catalyst temperature, the actual fuel injection amount in the post fuel injection is larger than the required fuel injection amount. In the post fuel injection, a relatively small amount of fuel is injected from the fuel injection valve.
- the reference catalyst temperature is subtracted from the detected catalyst temperature.
- the difference between the detected catalyst temperature and the reference catalyst temperature is calculated as the catalyst temperature difference.
- an increase in the fuel injection amount (this corresponds to a value obtained by subtracting the required fuel injection amount from the actual fuel injection amount) is calculated.
- the increase in the fuel injection amount calculated here is larger as the catalyst temperature difference is larger.
- the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the increase amount ⁇ Qi of the fuel injection amount thus calculated.
- the deposit accumulation amount Xd calculated here is larger as the fuel injection amount increase ⁇ Qi is larger.
- the deposit accumulation amount is calculated in consideration of this. Therefore, according to the fourth embodiment, the deposit accumulation amount is accurately calculated.
- a map for calculating the deposit accumulation amount based on the fuel injection amount increase ⁇ Qi is prepared as a map for calculating the deposit accumulation amount.
- the deposit accumulation amount is calculated using the increase amount ⁇ Qi of the fuel injection amount after being converted into the increase amount ⁇ Qi.
- a map for calculating the deposit accumulation amount based on the catalyst temperature difference may be prepared as a map for calculating the deposit accumulation amount, and the deposit accumulation amount may be directly calculated using the catalyst temperature difference. Therefore, in the fourth embodiment, it can be said that the deposit accumulation amount is calculated based on the increase in the fuel injection amount in the post fuel injection, and the deposit accumulation amount is calculated based on the catalyst temperature difference in the post fuel injection. It can be said that they are doing.
- the detected catalyst temperature is a catalyst temperature corresponding to the actual fuel injection amount in the post fuel injection
- the reference catalyst temperature is a catalyst temperature corresponding to the required fuel injection amount in the post fuel injection. From this, it can be said that in the fourth embodiment, it is determined whether or not the actual fuel injection amount is larger than the required fuel injection amount when the post fuel injection is executed.
- the amount of particulate discharged from the combustion chamber by burning the particulate generated due to the combustion of the main fuel (that is, the fuel injected from the fuel injection valve by the main fuel injection) (hereinafter this amount)
- the amount of fuel injected from the fuel injection valve by the after fuel injection depends on the deposit on the wall surface of the nozzle hole. The amount is so small that the actual fuel injection amount becomes larger than the required fuel injection amount when the fuel is deposited.
- the after fuel injection is a minute fuel injection. Therefore, when the after fuel injection mode is prepared, in the fourth embodiment, instead of the catalyst temperature difference at the time of post fuel injection, the deposit is calculated by using the difference in particulate discharge at the time of after fuel injection. The accumulation amount may be estimated. In this case, instead of the reference catalyst temperature, the particulate discharge amount when the actual fuel injection amount in the after fuel injection matches the required fuel injection amount is obtained in advance by experiments or the like and stored in the electronic control unit. The reference particulate discharge amount is used, and the particulate discharge amount detected when the after fuel injection is executed is used instead of the detected particulate generation amount.
- particulate discharge amount difference calculated by subtracting the detected particulate discharge amount from the reference particulate discharge amount is used instead of the particulate generation amount difference.
- the increase in the fuel injection amount calculated based on the particulate discharge amount difference is larger as the particulate discharge amount difference is larger.
- the concept included in the fourth embodiment is a sub fuel injection in which fuel is injected from the fuel injection valve at a timing that is later than the execution timing of the main fuel injection for a specific purpose and does not generate torque. This is applicable when there is a parameter that correlates with the difference between the actual fuel injection amount and the required fuel injection amount in the sub fuel injection.
- This routine is shown in FIG. Note that the routine of FIG. 8 is executed every time a predetermined time elapses.
- the post fuel injection flag Fpo is set when the post fuel injection mode is selected, and is reset when the selection of the post fuel injection mode is cancelled.
- Fpo 0, the routine ends as it is.
- step 402 it is judged if the catalyst temperature detected at step 401 (that is, the detected catalyst temperature) Tcat is higher than the reference catalyst temperature Tcatst (Tcat> Tcatst).
- Tcat> Tcatst that is, when the catalyst temperature is higher than the reference catalyst temperature because the actual fuel injection amount in the post fuel injection is larger than the required fuel injection amount.
- the routine proceeds to step 403.
- Tcat ⁇ Tcatst the routine ends as it is.
- step 403 the fuel is based on the difference between the catalyst temperature Tcat detected in step 401 and the reference catalyst temperature Tcatst (that is, the catalyst temperature difference).
- An increase amount ⁇ Qi of the injection amount is calculated.
- step 404 the deposit accumulation amount Xd is calculated from the map of FIG. 3 based on the fuel injection amount increase ⁇ Qi calculated at step 403, and the routine is terminated.
- the deposit amount is estimated only in connection with the minute fuel injection.
- fuel injection other than micro fuel injection that is, fuel injection for injecting more fuel than the required fuel injection amount when the deposit is accumulated on the wall surface of the injection hole
- the deposit accumulation amount may be estimated in relation to the relatively large fuel injection amount (main fuel injection).
- the required fuel injection amount is equal to or greater than a predetermined amount (that is, a fuel injection amount that causes the actual fuel injection amount to be smaller than the required fuel injection amount when deposits are deposited on the injection hole wall surface).
- a predetermined amount that is, a fuel injection amount that causes the actual fuel injection amount to be smaller than the required fuel injection amount when deposits are deposited on the injection hole wall surface.
- the actual fuel injection amount in the main fuel injection is smaller than the required fuel injection amount.
- the main fuel injection a relatively large amount of fuel is injected from the fuel injection valve. Therefore, when the actual fuel injection amount is smaller than the required fuel injection amount, deposits are accumulated on the wall surface of the injection hole. Become. Therefore, in the fifth embodiment, when the detected torque at the time of executing the main fuel injection is smaller than the reference torque, it is determined that the deposit is accumulated on the wall surface of the nozzle hole.
- the difference between the reference torque and the detected torque is calculated as the torque difference.
- the difference between the actual fuel injection amount and the required fuel injection amount based on the calculated torque difference (this difference corresponds to a value obtained by subtracting the actual fuel injection amount from the required fuel injection amount, This is referred to as “a decrease in fuel injection amount”). Note that the amount of decrease in the fuel injection amount calculated here is larger as the torque difference is larger.
- the determined deposit accumulation amount Xd is stored in the electronic control unit in the form of a map of the function of the fuel injection amount decrease ⁇ Qd. Then, the deposit accumulation amount Xd is calculated from the map of FIG. 9 based on the decrease ⁇ Qd of the fuel injection amount calculated when the main fuel injection is executed.
- the deposit accumulation amount Xd calculated here is larger as the fuel injection amount reduction amount ⁇ Qd is larger.
- FIG. 10 The routine of FIG. 10 is executed every time a predetermined time elapses. Further, since steps 501 to 506 of the routine of FIG. 10 are the same as steps 101 to 106 of the routine of FIG. 4, description of these steps is omitted.
- the fuel cut flag Ffc is set when the fuel cut is started, and is reset when the deposit accumulation amount is calculated in step 505 of the routine of FIG.
- step 508 When it is determined in step 507 that Qmain ⁇ Qth and the routine proceeds to step 508, the torque TQ is detected.
- step 509 it is determined whether or not the torque (ie, detected torque) TQ detected at step 508 is smaller than the reference torque TQst when executing main fuel injection (TQ ⁇ TQst).
- TQ ⁇ TQst that is, when the actual fuel injection amount is smaller than the required fuel injection amount, a torque smaller than the reference torque is generated
- the routine performs step. Proceed to 510.
- TQ ⁇ TQst the routine ends as it is.
- step 509 When it is determined in step 509 that TQ ⁇ TQst, and the routine proceeds to step 510, based on the difference (ie, torque difference) between the torque TQ detected in step 508 and the reference torque TQst when main fuel injection is performed. Thus, a decrease amount ⁇ Qd of the fuel injection amount is calculated.
- step 511 the deposit accumulation amount Xd is calculated from the map of FIG. 9 based on the fuel injection amount decrease ⁇ Qd calculated at step 510.
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Description
Claims (10)
- 燃料噴射弁を備えた内燃機関において、燃料噴射弁の燃料噴射孔を画成する壁面である噴孔画成壁面、該噴孔画成壁面以外の壁面であって燃料噴射孔の入口近傍の燃料噴射弁の壁面、および、前記噴孔画成壁面以外の壁面であって燃料噴射孔の出口近傍の燃料噴射弁の壁面の少なくとも1つから構成される噴孔壁面に堆積しているデポジットの量であるデポジット堆積量を算出することによってデポジット堆積量を推定するデポジット堆積量推定装置であって、燃料噴射弁から実際に噴射される燃料の量を実燃料噴射量と称し、燃料噴射弁から噴射させる燃料の量として要求される量を要求燃料噴射量と称し、デポジット堆積量が零であるときに要求燃料噴射量の燃料を燃料噴射弁から噴射させるために燃料噴射弁に与えられる指令値を燃料噴射指令値と称したとき、予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実燃料噴射量がそれに対応する要求燃料噴射量よりも多いか否かを判断する増量判断が行われ、該増量判断において実燃料噴射量がそれに対応する要求燃料噴射量よりも多いと判断されたときには該実燃料噴射量とそれに対応する要求燃料噴射量との間の差に基づいてデポジット堆積量が推定されるデポジット堆積量推定装置。
- トルクを発生させるタイミングで燃料を燃料噴射弁から噴射させる燃料噴射が内燃機関の複数の作動サイクルに亘って禁止されるフューエルカットが行われ、該フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与られたときに実燃料噴射量が要求燃料噴射量に一致している場合に発生するトルクを基準トルクと称した場合、フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない前記要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実際のトルクと前記基準トルクとの間の差が実燃料噴射量とそれに対応する要求燃料噴射量との間の差としてデポジット堆積量の推定に用いられる請求項1に記載のデポジット堆積量推定装置。
- トルクを発生させるタイミングで燃料を燃料噴射弁から噴射させる燃料噴射が内燃機関の複数の作動サイクルに亘って禁止されるフューエルカットが行われ、該フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与られたときに実燃料噴射量が要求燃料噴射量に一致している場合に発生するトルクを基準トルクと称した場合、フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない前記要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実際のトルクが前記基準トルクよりも大きい場合、実燃料噴射量がそれに対応する要求燃料噴射量よりも多いと判断される請求項1または2に記載のデポジット堆積量推定装置。
- トルクを発生させるタイミングで燃料を燃料噴射弁から噴射させる燃料噴射が内燃機関の複数の作動サイクルに亘って禁止されるフューエルカットが行われ、該フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与られたときに実燃料噴射量が要求燃料噴射量に一致している場合に発生するトルクを基準トルクと称し、フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない前記要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実際のトルクと前記基準トルクとの間の差に基づいて前記予め定められた量よりも少ない前記要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実燃料噴射量が前記要求燃料噴射量に一致するように前記燃料噴射指令値を補正するための補正値が学習される場合、該学習された補正値が実燃料噴射量とそれに対応する要求燃料噴射量との間の差としてデポジット堆積量の推定に用いられる請求項1~3のいずれか1つに記載のデポジット堆積量推定装置。
- トルクを発生させるタイミングで燃料を燃料噴射弁から噴射させる燃料噴射が内燃機関の複数の作動サイクルに亘って禁止されるフューエルカットが行われ、該フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与られたときに実燃料噴射量が要求燃料噴射量に一致している場合に発生するトルクを基準トルクと称し、フューエルカットが行われている期間中にトルクを発生させるタイミングで前記予め定められた量よりも少ない前記要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実際のトルクと前記基準トルクとの間の差に基づいて前記予め定められた量よりも少ない前記要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実燃料噴射量が前記要求燃料噴射量に一致するように前記燃料噴射指令値を補正するための補正値が学習される場合、該学習された補正値に基づいて前記増量判断が行われる請求項1~4のいずれか1つに記載のデポジット堆積量推定装置。
- 前記燃料噴射弁が内燃機関の燃焼室内に燃料を直接噴射する燃料噴射弁であり、内燃機関の1回の作動サイクル中にトルクを発生させることができるタイミングで燃料を燃料噴射弁から噴射させるメイン燃料噴射とトルクを発生させることがないタイミングであって前記メイン燃料噴射の実行タイミングよりも前のタイミングで燃料を燃料噴射弁から噴射させるサブ燃料噴射とが行われる場合、該サブ燃料噴射が行われるときに前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの該サブ燃料噴射による実燃料噴射量と該サブ燃料噴射に関する要求燃料噴射量との間の差が実燃料噴射量とそれに対応する要求燃料噴射量との間の差としてデポジット堆積量の推定に用いられる請求項1~5のいずれか1つに記載のデポジット堆積量推定装置。
- 前記燃料噴射弁が内燃機関の燃焼室内に燃料を直接噴射する燃料噴射弁であり、内燃機関の1回の作動サイクル中にトルクを発生させることができるタイミングで燃料を燃料噴射弁から噴射させるメイン燃料噴射とトルクを発生させることがないタイミングであって前記メイン燃料噴射の実行タイミングよりも前のタイミングで燃料を燃料噴射弁から噴射させるサブ燃料噴射とが行われる場合、該サブ燃料噴射が行われるときに前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの該サブ燃料噴射による実燃料噴射量と該サブ燃料噴射に関する要求燃料噴射量とに基づいて前記増量判断が行われる請求項1~6のいずれか1つに記載のデポジット堆積量推定装置。
- 前記燃料噴射弁が内燃機関の燃焼室内に燃料を直接噴射する燃料噴射弁であり、内燃機関の1回の作動サイクル中にトルクを発生させることができるタイミングで燃料を燃料噴射弁から噴射させるメイン燃料噴射とトルクを発生させることがないタイミングであって前記メイン燃料噴射の実行タイミングよりも後のタイミングで燃料を燃料噴射弁から噴射させるサブ燃料噴射とが行われる場合、該サブ燃料噴射が行われるときに前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの該サブ燃料噴射による実燃料噴射量と該サブ燃料噴射に関する要求燃料噴射量との間の差が実燃料噴射量とそれに対応する要求燃料噴射量との間の差としてデポジット堆積量の推定に用いられる請求項1~7のいずれか1つに記載のデポジット堆積量推定装置。
- 前記燃料噴射弁が内燃機関の燃焼室内に燃料を直接噴射する燃料噴射弁であり、内燃機関の1回の作動サイクル中にトルクを発生させることができるタイミングで燃料を燃料噴射弁から噴射させるメイン燃料噴射とトルクを発生させることがないタイミングであって前記メイン燃料噴射の実行タイミングよりも後のタイミングで燃料を燃料噴射弁から噴射させるサブ燃料噴射とが行われる場合、該サブ燃料噴射が行われるときに前記予め定められた量よりも少ない要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの該サブ燃料噴射による実燃料噴射量と該サブ燃料噴射に関する要求燃料噴射量とに基づいて前記増量判断が行われる請求項1~8のいずれか1つに記載のデポジット堆積量推定装置。
- 前記予め定められた量以上の要求燃料噴射量に対応する燃料噴射指令値が燃料噴射弁に与えられたときの実燃料噴射量がそれに対応する要求燃料噴射量よりも少ないか否かを判断する減量判断が行われ、該減量判断において実燃料噴射量がそれに対応する要求燃料噴射量よりも少ないと判断されたときには該実燃料噴射量とそれに対応する要求燃料噴射量との間の差に基づいてデポジット堆積量が推定される請求項1~9のいずれか1つに記載のデポジット堆積量推定装置。
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PCT/JP2011/060026 WO2012147143A1 (ja) | 2011-04-25 | 2011-04-25 | 内燃機関のデポジット堆積量推定装置 |
CN201180008935.9A CN102859162B (zh) | 2011-04-25 | 2011-04-25 | 内燃机的淀积物堆积量推断装置 |
JP2011538760A JP5083584B1 (ja) | 2011-04-25 | 2011-04-25 | 内燃機関のデポジット堆積量推定装置 |
US13/574,118 US8869605B2 (en) | 2011-04-25 | 2011-04-25 | Deposit amount estimation device of engine |
EP11860715.9A EP2703628A4 (en) | 2011-04-25 | 2011-04-25 | DEVICE FOR MEASURING THE MOUNTING OF DEPOSITS IN A COMBUSTION ENGINE |
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EP (1) | EP2703628A4 (ja) |
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EP2703635B1 (en) * | 2011-04-25 | 2017-07-19 | Toyota Jidosha Kabushiki Kaisha | Combustion product production amount estimation device, deposit separation amount estimation device, deposit accumulation amount estimation device, and fuel injection control device of internal combustion engine. |
US9416748B2 (en) * | 2011-04-29 | 2016-08-16 | International Engine Intellectual Property Company, Llc. | Method of compensating for injector aging |
JP6013722B2 (ja) * | 2011-11-18 | 2016-10-25 | 三菱自動車工業株式会社 | 内燃機関の制御装置 |
EP2982856B1 (en) * | 2013-04-03 | 2017-08-09 | Toyota Jidosha Kabushiki Kaisha | Fuel injection device |
US9777697B2 (en) | 2013-12-19 | 2017-10-03 | Ford Global Technologies, Llc | Spark plug fouling detection for ignition system |
JP2016145531A (ja) * | 2015-02-06 | 2016-08-12 | いすゞ自動車株式会社 | 内燃機関及び排気ガスの成分量推定方法 |
JP6446078B2 (ja) * | 2017-02-28 | 2018-12-26 | 株式会社Subaru | エンジン制御装置 |
DE102017217080B4 (de) | 2017-09-26 | 2021-08-26 | Audi Ag | Verfahren zum Betreiben einer Brennkraftmaschine sowie entsprechende Brennkraftmaschine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008309081A (ja) * | 2007-06-15 | 2008-12-25 | Toyota Motor Corp | 内燃機関の制御装置 |
JP2009257100A (ja) | 2008-04-11 | 2009-11-05 | Toyota Motor Corp | 内燃機関の噴射制御装置 |
JP2009264333A (ja) * | 2008-04-28 | 2009-11-12 | Toyota Motor Corp | 燃料噴射装置 |
JP2010065537A (ja) | 2008-09-08 | 2010-03-25 | Denso Corp | 内燃機関の燃料噴射制御装置及び燃料噴射制御システム |
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---|---|---|---|---|
CN1374890A (zh) * | 1999-07-12 | 2002-10-16 | Asml美国公司 | 使用组合化学品原位清洗半导体制造装置的方法和系统 |
AUPQ708100A0 (en) * | 2000-04-20 | 2000-05-18 | Orbital Engine Company (Australia) Proprietary Limited | Deposit control in fuel injector nozzles |
DE10135735B4 (de) * | 2001-07-21 | 2009-04-16 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine, insbesondere mit Direkteinspritzung, sowie Computerprogramm und Steuer- und/oder Regelgerät |
DE102006027405B3 (de) * | 2006-06-13 | 2007-12-13 | Siemens Ag | Verfahren zum Betreiben einer Brennkraftmaschine und Brennkraftmaschine |
ATE524537T1 (de) * | 2006-08-04 | 2011-09-15 | Infineum Int Ltd | Verfahren und anwendung zum vermeiden von ablagerungen in einem kraftstoffinjektor |
US20080060608A1 (en) * | 2006-09-07 | 2008-03-13 | Angela Priscilla Breakspear | Method and use for the prevention of fuel injector deposits |
JP4928335B2 (ja) * | 2007-04-17 | 2012-05-09 | 日野自動車株式会社 | 排気浄化装置 |
EP2703635B1 (en) * | 2011-04-25 | 2017-07-19 | Toyota Jidosha Kabushiki Kaisha | Combustion product production amount estimation device, deposit separation amount estimation device, deposit accumulation amount estimation device, and fuel injection control device of internal combustion engine. |
-
2011
- 2011-04-25 WO PCT/JP2011/060026 patent/WO2012147143A1/ja active Application Filing
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- 2011-04-25 CN CN201180008935.9A patent/CN102859162B/zh not_active Expired - Fee Related
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008309081A (ja) * | 2007-06-15 | 2008-12-25 | Toyota Motor Corp | 内燃機関の制御装置 |
JP2009257100A (ja) | 2008-04-11 | 2009-11-05 | Toyota Motor Corp | 内燃機関の噴射制御装置 |
JP2009264333A (ja) * | 2008-04-28 | 2009-11-12 | Toyota Motor Corp | 燃料噴射装置 |
JP2010065537A (ja) | 2008-09-08 | 2010-03-25 | Denso Corp | 内燃機関の燃料噴射制御装置及び燃料噴射制御システム |
Non-Patent Citations (1)
Title |
---|
See also references of EP2703628A4 |
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US8869605B2 (en) | 2014-10-28 |
EP2703628A1 (en) | 2014-03-05 |
EP2703628A4 (en) | 2014-12-17 |
JPWO2012147143A1 (ja) | 2014-07-28 |
JP5083584B1 (ja) | 2012-11-28 |
CN102859162B (zh) | 2015-08-12 |
US20120318053A1 (en) | 2012-12-20 |
CN102859162A (zh) | 2013-01-02 |
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