CN102454494A - Control device of internal combustion engine - Google Patents
Control device of internal combustion engine Download PDFInfo
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- CN102454494A CN102454494A CN2011103175150A CN201110317515A CN102454494A CN 102454494 A CN102454494 A CN 102454494A CN 2011103175150 A CN2011103175150 A CN 2011103175150A CN 201110317515 A CN201110317515 A CN 201110317515A CN 102454494 A CN102454494 A CN 102454494A
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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
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention provides the control device of an internal combustion engine, which can inhibit the degradation of the internal combustion engine in an EGR system due to the corrosion of the EGR system. The control device comprises an internal combustion engine (10), an EGR channel (42), an EGR catalyst (44), and an air-fuel ratio control unit. The internal combustion engine has a plurality of cylinders and the EGR channel divides the plurality of cylinders into a first cylinder group (No.2 and No.3 cylinders) and a second cylinder group. The waste gas of the first cylinder group flows back to an air intake passage. The EGR catalyst is arranged at the halfway of the EGR channel. The air-fuel ratio control unit can separately control the air-fuel ratios of the plurality of cylinders. In an occasion wherein the fuel increment requirement is provided, the air-fuel ratio control unit controls the air-fuel ratio of the first cylinder group to be rare and the air-fuel ratio of the second cylinder group to be dense. After the air-fuel ratios of the two cylinder groups are controlled and the bed temperature of the EGR catalyst is lower than the decomposition temperature (337 DEG C) of ammonium chloride, the temperature rising control of the EGR catalyst is implemented.
Description
Technical field
The present invention relates to a kind of control gear of internal-combustion engine, particularly relate to the control gear of internal-combustion engine with egr system.
Background technique
In the past, for example as TOHKEMY 2009-264203 communique is disclosed, a known part with waste gas of the specific cylinder of making was back to the venting gas appliance of internal-combustion engine of exhaust gas recirculation (EGR) device of gas handling system.In this device, in the occasion that makes the EGR catalyzer temperature-elevating, alternately implementing to make the air fuel ratio of the waste gas of discharging from specific cylinder is that rare control and the air fuel ratio that makes above-mentioned waste gas are dense control.Like this, can when making the EGR catalyzer temperature-elevating, suppress the deterioration of the specific fuel consumption of internal-combustion engine.
The existing technology document
Patent documentation
Patent documentation 1: TOHKEMY 2009-264203 communique
Patent documentation 2: TOHKEMY 2007-023888 communique
Patent documentation 3: TOHKEMY 2001-082132 communique
Patent documentation 4: TOHKEMY 2009-264203 communique
Summary of the invention
The problem that invention will solve
, when the acceleration of internal-combustion engine, be used to satisfy the fuel increment control of torque request.Contain a large amount of dense compositions in the waste gas when fuel increment.Therefore, if this dense gas backstreaming then can be imagined in the EGR catalyzer, to generate a large amount of ammonia (NN to egr system
3).In this occasion,, then exist chlorine in the fuel to combine and generate the ammonium chloride (NH that causes that deep-etching is reacted with ammonia if use the fuel of poor quality contain a large amount of chlorine
4Cl) danger.Therefore, hope that foundation is used for reducing the ammonium chloride amount that generates at egr system, suppresses the system of the corrosion deterioration of EGR catalyzer, EGR freezing mixture etc.
The present invention makes for the problem that solves above-mentioned that kind, and its purpose is to provide a kind of control gear of internal-combustion engine, and the control gear of this internal-combustion engine can suppress the deterioration that the corrosion because of egr system causes in having the internal-combustion engine of egr system.
The means that are used to deal with problems
The 1st invention provides a kind of control gear of internal-combustion engine in order to achieve the above object, and the control gear of this internal-combustion engine is characterised in that: have internal-combustion engine, EGR passage, EGR catalyzer and air fuel ratio control unit, this internal-combustion engine has a plurality of cylinders; This EGR passage make with above-mentioned a plurality of cylinders be divided into two groups first cylinder block, the waste gas of above-mentioned first cylinder block in second cylinder block refluxes to gas-entered passageway; This EGR catalyzer is configured in above-mentioned EGR passage midway; This air fuel ratio control unit can be distinguished the air fuel ratio of controlling above-mentioned a plurality of cylinders individually; In the occasion of above-mentioned internal-combustion engine having been sent the fuel increment requirement, above-mentioned air fuel ratio control unit carries out the control of following air fuel ratio, that is, the air fuel ratio of above-mentioned first cylinder block is controlled to be rare, is controlled to be the air fuel ratio of above-mentioned second cylinder block dense.
The 2nd invention also has such characteristic on the basis of the 1st invention: also have bed temperature acquiring unit and intensification unit; This bed temperature acquiring unit obtains the bed temperature of above-mentioned EGR catalyzer; After having implemented above-mentioned air fuel ratio control, in the bed temperature of the above-mentioned EGR catalyzer occasion lower than set point of temperature, this intensification unit heats up the temperature of above-mentioned EGR catalyzer.
The 3rd invention also has such characteristic on the basis of the 2nd invention: the enforcement of above-mentioned intensification unit makes the ignition lag control that postpones the firing time of above-mentioned first cylinder block.
The 4th invention also has such characteristic on the basis of the 2nd invention: above-mentioned intensification unit is implemented to make the air fuel ratio of above-mentioned first cylinder block alternately be reversed to dense and rare air fuel ratio vibration control.
Also have such characteristic on the basis of the 5th invention any one invention in the 1st～the 4th: also have turbosupercharger, first exhaust passage and second exhaust passage, this turbosupercharger has turbine, and said turbine has two inlets; This first exhaust passage makes the waste gas of above-mentioned first cylinder block flow into an inlet of above-mentioned turbine; This second exhaust passage makes the waste gas of above-mentioned second cylinder block flow into another inlet of above-mentioned turbine; Above-mentioned EGR passage connects above-mentioned first exhaust passage and above-mentioned gas-entered passageway.
The effect of invention
According to the 1st invention, even the occasion that requires at the fuel increment that has internal-combustion engine, the exhaust gas recirculation that also makes rare air fuel ratio is in the EGR passage.Be difficult to generate ammonia from the waste gas of rare air fuel ratio.Therefore,, can be suppressed at the ammonia amount that generates in the EGR catalyzer effectively according to the present invention, so, ammonium chloride (NH can be reduced
4Cl) production prevents the corrosion of egr system.
According to the 2nd invention,, implement the intensification control of this EGR catalyzer in the bed temperature of the EGR catalyzer occasion lower than set point of temperature.Ammonium chloride decomposes under high temperature condition.Therefore, according to the present invention, even in egr system, produced under the situation of ammonium chloride, also can be effectively with its decomposition.
According to the 3rd invention, postponed the firing time of first cylinder block, thereby can improve the temperature that is back to the waste gas in the EGR passage, so, can improve the bed temperature of EGR catalyzer effectively.
According to the 4th invention, the air fuel ratio that is back to the waste gas (waste gas of first cylinder block) in the EGR passage alternately is inverted to dense and rare.Therefore, according to the present invention, can improve the bed temperature of EGR catalyzer effectively.
According to the 5th invention, in the internal-combustion engine that has so-called pair of inlet type turbosupercharger, can be suitable for the present invention with two inlets.
Description of drawings
Fig. 1 is used to explain the figure as the system architecture of mode of execution 1 of the present invention.
Fig. 2 has carried the figure that time of speed and air fuel ratio of the vehicle of internal-combustion engine changes for expression.
Fig. 3 for expression with respect to exhaust air-fuel ratio, ammonia generates the figure of concentration and the relation of rise time.
Fig. 4 is the flow chart of the program of enforcement in embodiment of the present invention 1.
Fig. 5 has carried the figure of the example that time of bed temperature of speed, air fuel ratio and EGR catalyzer of the vehicle of internal-combustion engine changes for expression.
Fig. 6 is the flow chart of the program of enforcement in embodiment of the present invention 2.
Embodiment
Below, according to description of drawings mode of execution of the present invention.Wherein, to the identical symbol of part mark general in each figure, and the explanation of omission repetition.In addition, the present invention can't help following mode of execution and limits.
The structure of mode of execution 1
Fig. 1 is used to explain the figure as the system architecture of embodiment of the present invention 1.As shown in Figure 1, the system of this mode of execution has internal-combustion engine 10.Internal-combustion engine 10 constitutes the four in upright arrangement by the reiteration outburst of #1 → #3 → #4 → #2.In internal-combustion engine 10, connect gas-entered passageways 14, internal cooler 16, closure 18 etc. are set midway at gas-entered passageway 14 through inlet manifold 12.Closure 18 opens and closes gas-entered passageway 14 according to accelerator opening etc., makes corresponding to this aperture to suck the air quantity increase and decrease.In addition, in each cylinder of internal-combustion engine 10, dispose the Fuelinjection nozzle 20 that is used for to in-cylinder injection fuel respectively.In addition, in the system of Fig. 1, four in upright arrangement has been described, but also can have been constituted the multiple cylinder engine of V-type.In addition, in the system of Fig. 1, the injection valve 20 that acts as a fuel uses the Fuelinjection nozzle that injects fuel directly into the direct spray type in the cylinder, but also can be the Fuelinjection nozzle of the pore jet-type in the pore that injects fuel into each cylinder.
In the internal-combustion engine 10 of this mode of execution, has turbosupercharger 30.Turbosupercharger 30 have the waste gas that utilizes internal-combustion engine 10 energy action turbine 301 and by these turbine 301 compressor driven 302.On compressor 302, connecting above-mentioned gas-entered passageway 14.Can compress sucking air through compressor 302.
Turbine 301 has two inlets.That is, this turbosupercharger 30 is the turbosupercharger of two inlet formulas (two-volute).On a side's of turbine 301 inlet, connect first discharge manifold 32, on the opposing party's inlet, connecting second discharge manifold 34.First discharge manifold 32 is connected to #2 cylinder and #3 cylinder.That is, first discharge manifold 32, converge, flow into a side's of turbine 301 inlet from #2 cylinder waste gas of discharging and the waste gas of discharging from the #3 cylinder.Below, will be called " first cylinder block " by the cylinder block that #2 cylinder and #3 cylinder constitute.
On the other hand, second discharge manifold 34 is connected to #1 cylinder and #4 cylinder.That is, second discharge manifold 34, converge, flow into the opposing party's of turbine 301 inlet from #1 cylinder waste gas of discharging and the waste gas of discharging from the #4 cylinder.Below, will be called " second cylinder block " by the cylinder block that #1 cylinder and #4 cylinder constitute.According to the turbosupercharger 30 of so two inlet formulas, can suppress the interference of the exhaust pulsation between cylinder, obtain good supercharging performance.
Outlet at turbine 301 connects exhaust passage 36.In series dispose catalyzer under start catalysts as three-way catalyst (below be called " SC ") 38 and the base plate (below be called " UFC ") 40 midway in exhaust passage 36.Internal-combustion engine 10 is that dense occasion is discharged HC and CO easily in air fuel ratio.In addition, be that rare occasion is discharged NOx easily in air fuel ratio.SC38 and UFC40 be adsorb oxygen (O in rare atmosphere on one side
2), Yi Bian make the NOx reduction (be cleaned into N
2).On the other hand, in dense atmosphere, Yi Bian discharge oxygen, Yi Bian oxidation HC and CO (are cleaned into H
2O, CO
2).In addition, under dense atmosphere, be included in nitrogen and hydrogen in the waste gas, or HC and NOx react, thereby generate ammonia (NH
3).
In addition, internal-combustion engine 10 has and makes exhaust gas recirculation arrive the EGR device of gas handling system.The EGR device has the EGR passage 42 that is connected between first discharge manifold 32 and the inlet manifold 12.In the way of EGR passage 42, be provided with EGR catalyzer 44 as oxidation catalyst.In addition, more being in the EGR passage 42 in downstream side, be provided with cooler for recycled exhaust gas 46 than EGR catalyzer 44.Cooler for recycled exhaust gas 46 constitutes by engine cooling water the waste gas that in EGR passage 42, flows is cooled off.In addition, in the EGR passage 42 that more is in the downstream side than cooler for recycled exhaust gas 46, be provided with the EGR valve 48 of the flow that is used to control EGR gas.
In addition, the system of this mode of execution that kind as shown in Figure 1 has ECU (electronic control unit) 50.At the input part of ECU50, connect the various sensors of the engine information be used to obtain engine speed, throttle opening etc.In addition, the various actuators that connect above-mentioned closure 18, Fuelinjection nozzle 20, EGR valve 48 etc. at the carry-out part of ECU50.ECU50 is according to the operating condition of the various information Control internal-combustion engines of having imported 10.
The action of mode of execution 1
(about the control of EGR) is purpose with the generation that suppresses NOx etc. in internal-combustion engine 10, makes the part of waste gas (burnt gas) be back to the EGR of the inlet manifold 12 of this internal-combustion engine 10.More specifically, if EGR valve 48 is driven valve, then form the EGR path that is communicated with by first discharge manifold, 32 → EGR passage, 42 → inlet manifold 12.The part of the waste gas that in first discharge manifold 32, flows in above-mentioned EGR path, circulating under the differential pressure effect of exhaust pressure and suction pressure, is back to inlet manifold 12.If carry out EGR, then can reduce cold damage, so, can improve specific fuel consumption effectively.
Here, EGR passage 42 is connected to the exhaust passage at turbosupercharger 30 upper reaches in order to produce the differential pressure of exhaust pressure and suction pressure effectively.Therefore, the not purified waste gas (EGR gas) through SC38 and UFC40 is not imported in the EGR path.Yet, if the EGR gas communication that purifies to this EGR path, exists PM attached on cooler for recycled exhaust gas 46, the EGR valve 48 and the danger that causes that cooling effectiveness in the cooler for recycled exhaust gas 46 descends, the action of EGR valve 48 is bad etc.In addition, if these PM are directed to inlet manifold 12, then exist a large amount of sedimentss to be accumulated in the danger in the suction port.Therefore, in the system of this mode of execution, the upstream side of the cooler for recycled exhaust gas 46 in EGR passage 42 is provided with EGR catalyzer 44.EGR catalyzer 44 has the function as the oxidation catalyst that the PM that is included in the EGR gas is purified.Like this, in the system of this mode of execution, can effectively the PM that is included in the EGR gas be removed.
Below (the fuel increment control when quickening), the fuel increment the when acceleration of in the system of this mode of execution, implementing be described is controlled.Fig. 2 has represented to carry the figure that time of speed and air fuel ratio of the vehicle of internal-combustion engine 10 changes.As shown in the drawing, ECU50 makes internal-combustion engine 10 runnings (stoichiometric operation) by theoretical air fuel ratio (A/F=14.6) usually.On the other hand, when the acceleration that needs torque, ECU50 makes internal-combustion engine 10 runnings by the dense air fuel ratio (for example A/F=11.5) of regulation.Through this fuel increment control, output driver's the needed torque of acceleration request.
As above-mentioned, in SC38 and UFC40, under dense atmosphere, generate ammonia (NH here,
3).This also is suitable in EGR catalyzer 44.That is, as above-mentioned, the part of the waste gas in first discharge manifold 32 is passed in the EGR catalyzer 44.Therefore, state on the implementation in the fuel increment control, in EGR catalyzer 44, also generate ammonia.In addition, according to the application's inventor's opinion, the exhaust air-fuel ratio when the ammonia amount that in catalyzer, generates is controlled because of fuel increment changes.Fig. 3 for expression with respect to exhaust air-fuel ratio, ammonia generates the figure of concentration and the relation of rise time.That kind as shown in the drawing is the occasion that is near the dense slightly air fuel ratio the A/F=13 in exhaust air-fuel ratio, and ammonia concentration is the highest.Therefore, if the target A/F when fuel increment controlled is controlled to be this dense slightly air fuel ratio, then in each catalyzer, generate a large amount of ammonia.
Here, as the fuel that is used for internal-combustion engine 10, selling on the market has the fuel of poor quality that contains a large amount of chlorine, sulphur.If in the burning of internal-combustion engine 10, use this fuel of poor quality, then discharge has been comprised the waste gas of a large amount of chlorine components, sulphur composition.Therefore, in the enforcement of the fuel increment control that generates ammonia, the composition of this fuel of poor quality causes the reaction shown in the following formula with the ammonia that has generated.
NH
3+ Cl → NH
4Cl (ammonium chloride) ... (1)
H
2O+Cl → HCl (hydrochloric acid)+OH
-... (2)
NH
3+ SOx → H
2SO
4(sulfuric acid) ... (3)
H
2SO
4(sulfuric acid)+HCl (hydrochloric acid) → mixed acid ... (4)
By the resultant that the reaction of following formula (1)～(4) obtains, all possibly become the corrosion of metal base, the NH that particularly generates by following formula (1)
4Cl (ammonium chloride) will cause the deep-etching reaction.Therefore, if in the process of implementing fuel increment control in EGR catalyzer 44 a large amount of these ammonium chlorides that generate, then have the danger of the corrosion such as EGR catalyzer 44, cooler for recycled exhaust gas 46 of egr system.
Therefore, in the system of this mode of execution 1,, suppress the formation reaction of ammonium chloride through suppressing and be included in the generation of the ammonia of the chlorine component reaction in the fuel of poor quality.Specifically; In the fuel increment control when generating the acceleration of ammonia usually; The air fuel ratio of first cylinder block that is connected to first discharge manifold 32 that is communicated with EGR passage 42 (#2 and #3 cylinder) is controlled to be rare air fuel ratio (for example A/F=15) of regulation, and the air fuel ratio of second cylinder block (#1 and #4 cylinder) that will be connected with second discharge manifold 34 is controlled to be the dense air fuel ratio of regulation.If the air fuel ratio of first cylinder block is controlled to be rare, then the exhaust flow of rare air fuel ratio leads in the EGR passage 42.Like this, can when satisfying desired acceleration request (fuel increment requirement), reduce the ammonia amount that in EGR catalyzer 44, generates, so, the formation reaction of ammonium chloride can be suppressed effectively.
And, consider the air fuel ratio shown in Figure 3 and the relation of ammonia concentration, the air fuel ratio of second cylinder block when fuel increment being controlled is controlled to be the air fuel ratio (for example A/F=10) that does not generate ammonia with preferably doing one's utmost.Like this, the ammonium chloride amount that in SC38 and UFC40, generates also can reduce, so, also possibly suppress the corrosion of these catalyzer.In addition,, have such tendency according to relation shown in Figure 3, that is, the air fuel ratio of waste gas more from dense air fuel ratio near chemically correct fuel, then the time till ammonia produces is elongated more.Therefore, during the target air-fuel ratio of second cylinder block when setting fuel increment control, preferably not only consider the generation concentration of ammonia, but also consider the rise time of ammonia.
The concrete processing of mode of execution 1
Below, the concrete content of the processing that explanation is implemented in this mode of execution with reference to Fig. 4.Fig. 4 is the flow chart of the program of ECU50 execution.In addition, program shown in Figure 4 is the program of in the running of internal-combustion engine 10, implementing repeatedly.
In program shown in Figure 4, the fuel increment of at first judging when whether having proposed to quicken etc. requires (step 100).As a result, being judged to be the occasion that does not propose the fuel increment requirement, implement this step 100 repeatedly.On the other hand, in above-mentioned steps 100, be judged to be the occasion that has proposed the fuel increment requirement, transferred to next step, implemented fuel increment control (step 102).Here, specifically, the air fuel ratio of first cylinder block (#2 and #3 cylinder) is controlled as rare air fuel ratio (A/F=15) of regulation, and the air fuel ratio of second cylinder block (#1 and #4 cylinder) is controlled as the dense air fuel ratio (A/F=10) of regulation.
That kind as described above, according to the system of this mode of execution 1, in the fuel increment control when quickening, the air fuel ratio of first cylinder block is controlled as rare air fuel ratio.Like this, the air fuel ratio that can make the waste gas that flows to EGR passage 42 is rare, so, can reduce the growing amount of ammonium chloride.
, in the system of above-mentioned mode of execution 1, in the system of the turbosupercharger with two inlet formulas 30, the waste gas of first discharge manifold 32 is imported to EGR passage 42, but the structure of EGR device is not limited thereto.That is,, then for example also can be the structure of discharge manifold that the EGR passage is connected to the one-sided cylinder block of V-type engine if will have the structure that the waste gas of a part of cylinder of the internal-combustion engine 10 of a plurality of cylinders imports to EGR passage 42.
In addition; In the system of above-mentioned mode of execution 1, when carrying out fuel increment control, the air fuel ratio of first cylinder block is controlled to be rare air fuel ratio of regulation; The air fuel ratio of second cylinder block is controlled to be the dense air fuel ratio of regulation, but the action opportunity of this air fuel ratio control is not limited thereto.That is, also can detect the proterties of the fuel of supply, only contain the chlorine more than the normality, the occasion of sulphur composition, the air fuel ratio control when implementing this fuel increment control.Like this, can suppress the following state of affairs effectively, that is, under the situation of the normal fuel that the resultants such as ammonium chloride that become reason for corrosion do not generate, implement unnecessary control.
And in above-mentioned mode of execution 1, #2 and #3 cylinder are equivalent to " first cylinder block " of above-mentioned the 1st invention, and #1 and #4 cylinder are equivalent to " second cylinder block " of above-mentioned the 1st invention, and inlet manifold 12 is equivalent to " gas-entered passageway " of above-mentioned the 1st invention.In addition, in above-mentioned mode of execution 1, ECU50 implements the processing of above-mentioned steps 100～102, thereby realizes " the air fuel ratio control unit " of above-mentioned the 1st invention.
The characteristic of mode of execution 2
Below, with reference to Fig. 5 mode of execution 2 of the present invention is described.This mode of execution 2 can be realized through the program of stating after using system shown in Figure 1 that ECU50 is carried out shown in Figure 6.
In the system of above-mentioned mode of execution 1, when fuel increment is controlled, import to EGR catalyzer 44 through waste gas with rare air fuel ratio, reduce the growing amount of ammonia, its result reduces the growing amount of ammonium chloride.
In the system of this mode of execution 2, be characterised in that, the ammonium chloride that in EGR catalyzer 44, has generated is decomposed.That is, the reaction of above-mentioned formula (1) is reversible reaction, if temperature is more than 337 ℃, and then on the contrary can also be with ammonium chloride (NH
4Cl) decompose ammonification and chlorine.
Yet the catalyzer bed temperature of EGR catalyzer 44 is corresponding to the operating condition of internal-combustion engine 10 and change.Fig. 5 has carried the figure of the example that time of bed temperature of speed, air fuel ratio and EGR catalyzer 44 of the vehicle of internal-combustion engine 10 changes for expression.In the example shown in this figure, even be the state that the catalyzer bed temperature does not reach the decomposition temperature (337 ℃) of ammonium chloride, the fuel increment control when also quickening.In this occasion, the formation reaction of ammonium chloride takes place, but the decomposition reaction of the ammonium chloride that can not generate on the contrary.
Therefore, in the system of this mode of execution 2, do not reach at the catalyzer bed temperature of EGR catalyzer 44 under the state of decomposition temperature and carry out under the situation of fuel increment control, implement the intensification control of catalyzer bed temperature.More specifically, the bed temperature of the EGR catalyzer 44 when detecting fuel increment control than decomposing the low occasion of temperature (337 ℃), is implemented the intensification control of EGR catalyzer 44 at this bed temperature.Control as bed temperature; Postpone control the firing time that for example can implement to make firing time of first cylinder block to postpone; Alternately make the air fuel ratio of first cylinder block be changed to pulsation control than rare side of chemically correct fuel and a dense side, or with a side's of first cylinder block cylinder (for example #2 cylinder) be controlled to be rare air fuel ratio, R-L that the opposing party's cylinder (for example #3 cylinder) is controlled to be dense air fuel ratio controls etc.Like this, can make the catalyst bed temperature rise temperature of EGR catalyzer 44 effectively, so, the decomposition reaction of ammonium chloride, the generation of inhibition corrosion can be promoted.
The concrete processing of mode of execution 2
Below, the concrete content of the processing that explanation is implemented in this mode of execution with reference to Fig. 6.Fig. 6 is the flow chart of the program of ECU50 execution.Program shown in Figure 6 is implemented in the running of internal-combustion engine 10 repeatedly.
In program shown in Figure 6, at first, the fuel increment of judging when whether having proposed to quicken etc. requires (step 200).Its result judging the occasion that does not propose the fuel increment requirement, implements this step 200 repeatedly.On the other hand, in above-mentioned steps 200, proposed in judgement to transfer to next step under the situation of fuel increment requirement, implemented fuel increment control (step 202).Specifically, implement the processing same here, with above-mentioned steps 102.
Below, whether the bed temperature of judging EGR catalyzer 44 here, specifically, judges whether the catalyzer bed temperature of EGR catalyzer 44 fuel increment control after than the decomposition temperature (337 ℃) of ammonium chloride lower than decomposing temperature lower (step 204).As a result, failing to confirm the occasion that this condition of catalyzer bed temperature＜decomposition temperature is set up, judging that the temperature conditions of the decomposition reaction that is used for ammonium chloride is set up.In this occasion, even being heated up, the bed temperature of EGR catalyzer 44 do not carry out the decomposition reaction of ammonium chloride, so this program promptly finishes yet.On the other hand; In above-mentioned steps 204, confirming to judge that the temperature conditions of the decomposition reaction of ammonium chloride is false under the situation that this condition of catalyzer bed temperature＜decomposition temperature is set up; Transfer to next step, implement the catalyzer temperature-elevating control (step 206) of EGR catalyzer 44.Specifically, implement to postpone above-mentioned firing time any in control, pulsation control and the R-L control here, for first cylinder block.
That kind as described above according to the system of this mode of execution 2, after the fuel increment control when quickening, does not reach the occasion of the decomposition temperature of ammonium chloride in the intensification of EGR catalyzer 44, implements the catalyzer temperature-elevating control of this EGR catalyzer 44.Like this, can in EGR catalyzer 44, promote the decomposition reaction of ammonium chloride, so, the corrosion of the egr system that can prevent effectively to cause by ammonium chloride.
, in the system of above-mentioned mode of execution 2, though in the system of the turbosupercharger with two inlet formulas 30, the waste gas of first discharge manifold 32 is imported in the EGR passage 42, the structure of EGR device is not limited thereto.That is,, then for example also can be the structure of discharge manifold that the EGR passage is connected to the one-sided cylinder block of V-type engine if will have the structure that the waste gas of a part of cylinder of the internal-combustion engine 10 of a plurality of cylinders imports to EGR passage 42.
In addition; In the system of above-mentioned mode of execution 2; When fuel increment is controlled, the air fuel ratio of first cylinder block is controlled to be rare air fuel ratio of regulation, the air fuel ratio of second cylinder block is controlled to be the dense air fuel ratio of regulation, but the action opportunity of this air fuel ratio control is not limited thereto.That is, also can detect the proterties of the fuel of supply, only contain the chlorine more than the normality, the occasion of sulphur composition, the air fuel ratio control when implementing this fuel increment control.Like this, can suppress the following state of affairs effectively, that is,, implement unnecessary control in the occasion of the normal fuel of the resultants such as ammonium chloride that do not become reason for corrosion.
In addition; In the system of above-mentioned mode of execution 2,, explained to postpone control, pulsation control and R-L control firing time as the catalyzer temperature-elevating control of EGR catalyzer 44; But enforceable catalyzer temperature-elevating control is not limited thereto, and also can implement other known catalyzer temperature-elevating control.
And; In above-mentioned mode of execution 2, ECU50 realizes " the air fuel ratio control unit " of above-mentioned the 2nd invention through implementing the processing of above-mentioned steps 200～202; Through implementing the processing of above-mentioned steps 204; Realize " the bed temperature acquiring unit " of above-mentioned the 2nd invention,, realize " the intensification unit " of above-mentioned the 2nd invention through implementing the processing of above-mentioned steps 204～206.
The explanation of symbol
10 internal-combustion engines
12 inlet manifolds
14 gas-entered passageways
16 internal coolers
18 closures
20 Fuelinjection nozzles
30 turbosupercharger
301 turbines
302 compressors
32 first discharge manifolds
34 second discharge manifolds
36 exhaust passages
38 start catalysts (SC)
Catalyzer under 40 base plates (UFC)
42 EGR passages
44 EGR catalyzer
46 coolers for recycled exhaust gas
48 EGR valves
50 ECU (electronic control unit)
Claims (5)
1. the control gear of an internal-combustion engine is characterized in that: have internal-combustion engine (10), EGR passage (42), EGR catalyzer (44) and air fuel ratio control unit (50),
This internal-combustion engine (10) has a plurality of cylinders;
This EGR passage (42) make with above-mentioned a plurality of cylinders be divided into two groups first cylinder block, the waste gas of above-mentioned first cylinder block in second cylinder block refluxes to gas-entered passageway (12);
This EGR catalyzer (44) is configured in above-mentioned EGR passage midway;
This air fuel ratio control unit (50) can be distinguished the air fuel ratio of controlling above-mentioned a plurality of cylinders individually;
In the occasion of above-mentioned internal-combustion engine having been sent the fuel increment requirement, above-mentioned air fuel ratio control unit carries out the control of following air fuel ratio, that is, the air fuel ratio of above-mentioned first cylinder block is controlled to be rare, is controlled to be the air fuel ratio of above-mentioned second cylinder block dense.
2. the control gear of internal-combustion engine according to claim 1 is characterized in that: also have bed temperature acquiring unit and intensification unit;
This bed temperature acquiring unit obtains the bed temperature of above-mentioned EGR catalyzer;
After having implemented above-mentioned air fuel ratio control, in the bed temperature of the above-mentioned EGR catalyzer occasion lower than set point of temperature, this intensification unit heats up the temperature of above-mentioned EGR catalyzer.
3. the control gear of internal-combustion engine according to claim 2 is characterized in that: the ignition lag control that postpones the firing time of above-mentioned first cylinder block is implemented to make in above-mentioned intensification unit.
4. the control gear of internal-combustion engine according to claim 2 is characterized in that: above-mentioned intensification unit is implemented to make the air fuel ratio of above-mentioned first cylinder block alternately be reversed to dense and rare air fuel ratio vibration control.
5. according to the control gear of any one described internal-combustion engine in the claim 1～4, it is characterized in that: also have turbosupercharger (30), first exhaust passage (32) and second exhaust passage (34),
This turbosupercharger (30) has turbine, and said turbine has two inlets;
This first exhaust passage (32) makes the waste gas of above-mentioned first cylinder block flow into an inlet of above-mentioned turbine;
This second exhaust passage (34) makes the waste gas of above-mentioned second cylinder block flow into another inlet of above-mentioned turbine;
Above-mentioned EGR passage (42) connects above-mentioned first exhaust passage (32) and above-mentioned gas-entered passageway (12).
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| CN103557098A (en) * | 2013-10-29 | 2014-02-05 | 潍柴动力股份有限公司 | Exhaust gas recirculation system and exhaust gas recirculation rate control method |
| CN104948325A (en) * | 2014-03-26 | 2015-09-30 | 周向进 | Gasoline engine and method for testing gasoline octane value thereof |
| CN105378242A (en) * | 2013-07-04 | 2016-03-02 | 丰田自动车株式会社 | Exhaust gas cleaning system for internal combustion engine |
| CN106795852B (en) * | 2014-10-03 | 2018-08-07 | 康明斯公司 | Variable igniting energy management |
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| JP5598370B2 (en) * | 2011-02-18 | 2014-10-01 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| JP7196391B2 (en) * | 2017-11-08 | 2022-12-27 | トヨタ自動車株式会社 | Control device for internal combustion engine |
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| JP2007023888A (en) * | 2005-07-15 | 2007-02-01 | Mitsubishi Motors Corp | Control device of internal combustion engine |
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| JP2009264203A (en) * | 2008-04-23 | 2009-11-12 | Toyota Motor Corp | Exhaust device for internal combustion engine |
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| JP2007023888A (en) * | 2005-07-15 | 2007-02-01 | Mitsubishi Motors Corp | Control device of internal combustion engine |
| CN101405501A (en) * | 2006-03-23 | 2009-04-08 | 丰田自动车株式会社 | Exhaust gas control system for internal combustion engine |
| JP2007278160A (en) * | 2006-04-06 | 2007-10-25 | Toyota Motor Corp | Control device for internal combustion engine |
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| CN104948325A (en) * | 2014-03-26 | 2015-09-30 | 周向进 | Gasoline engine and method for testing gasoline octane value thereof |
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| JP2012087673A (en) | 2012-05-10 |
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Application publication date: 20120516 |