CN101169060A - Exhaust cleaning device and catalyst regeneration control method for the same - Google Patents
Exhaust cleaning device and catalyst regeneration control method for the same Download PDFInfo
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- CN101169060A CN101169060A CNA2007101679185A CN200710167918A CN101169060A CN 101169060 A CN101169060 A CN 101169060A CN A2007101679185 A CNA2007101679185 A CN A2007101679185A CN 200710167918 A CN200710167918 A CN 200710167918A CN 101169060 A CN101169060 A CN 101169060A
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Abstract
The present invention discloses an internal combustion engine of a vehicle with an exhaust cleaning apparatus and control method. In the exhaust cleaning apparatus and method, exhaust from a combustion chamber is conducted to a main catalytic converter disposed in a main exhaust channel. A fuel cutting operation is performed upon determining a deceleration state in the vehicle and establishment of a condition for stopping fuel supply to the engine. Then, a main-channel blocking device closes the main exhaust channel so that the exhaust flows through a bypass catalytic converter disposed in a bypass exhaust channel upstream from the main catalytic converter and then merges again with the main exhaust channel upstream from the main catalytic converter after the fuel cutting operation and upon determining one of either an elapsed of a prescribed period of time, or an air-fuel ratio of the exhaust reaching a stable state.
Description
Technical field
The present invention relates to a kind of catalyst regeneration device that is used for the Exhaust gas purifying device of internal-combustion engine.Or rather, the present invention relates to control the internal-combustion engine with main catalytic converter and bypass catalyst, the sulphur that is used for removing the catalyzer of bypass catalyst is poisoned.
Background technique
The vehicle that great majority have internal-combustion engine all is provided with Exhaust gas purifying device.An example that is used for traditional Exhaust gas purifying device of internal-combustion engine is disclosed the disclosed patent publications No.9-88687 of Japan.At this publication, Exhaust gas purifying device comprises a pair of catalyst that is arranged in the vent systems.Described vent systems comprises the outlet pipe that has main catalytic converter and has the bypass exhaust passage of bypass catalyst.Described main exhaust passageway and bypass exhaust passage walk abreast.Bypass control valve is arranged on the point of branching place of outlet pipe and bypass exhaust passage, makes exhaust be controlled so that can flow into outlet pipe or bypass exhaust passage.
In this publication, when the internal-combustion engine preheating, described exhaust flows into bypass exhaust passage, and comes purifying exhaust gas by the bypass catalyst that is arranged in the bypass exhaust passage.After preheating, exhaust flows into outlet pipe, and comes purifying exhaust gas by the main catalytic converter that is arranged in the outlet pipe.
In view of the above, according to present disclosure, be to be apparent that to those skilled in the art, there is demand to improved catalyst regeneration device.The present invention is devoted to these demands and other demands in related domain, and these incite somebody to action apparent to those skilled in the art according to present disclosure.
Summary of the invention
High-temperature discharge gas flows through main exhaust passageway from internal-combustion engine.Usually, main catalytic converter is arranged in the main exhaust passageway in the tight downstream of internal-combustion engine.The catalyzer that is arranged in the main catalytic converter in the tight downstream of internal-combustion engine is maintained at high temperature usually, makes catalyzer in the catalyst not be vulnerable to sulphur and poisons.On the other hand, when Exhaust gas purifying device comprises when being used to make the bypass exhaust passage main exhaust passageway bypass, that have the bypass catalyst, between warming up period, make described exhaust flow into the bypass catalyst that is arranged on the tight downstream of internal-combustion engine.After preheating, switch and make exhaust in normal course of operation, flow into main exhaust passageway.Yet, adopt this structure, part exhaust even in normal course of operation, also flow to bypass.Therefore, even the heat that offers the bypass catalyst by the exhaust that flow to bypass reduces, exhaust will be flow through described bypass.In other words, problem is that when the bypass catalyst was arranged in the bypass, temperature can not be increased to sulphur and poison non-incident temperature.Also have, because catalyst is flow through in part exhaust meeting continuously, so the amount that sulphur is poisoned can continue to increase.Thus, sulphur may finally can not be removed, and because sulphur is poisoned, the performance of bypass catalyst can reduce.
Therefore, an object of the present invention is to provide a kind of catalyst of internal combustion engine regeneration method and/or a kind of Exhaust gas purifying device that is used to make catalyst regeneration, described catalyzer is used for purifying exhaust gas and is subjected to the murder by poisoning of sulphur after after a while in warm.
By providing a kind of catalyst regeneration controlling method that is used for the Exhaust gas purifying device of vehicle can obtain the above target basically, described method comprises: exhaust is directed to the main catalytic converter that is arranged on the main exhaust passageway from the firing chamber of internal-combustion engine; Determine the generation of vehicle deceleration state; Determine during described vehicle deceleration state, to be used to stop the foundation of at least one condition of the supply of fuel of described internal-combustion engine; When determining to have set up the described condition that stops the motor fuel supply, carry out fuel cut-off operation; And one of two conditions that reached steady state through the air fuel ratio of specified time period or described exhaust after the described fuel cut-off operation of execution after carrying out described fuel cut-off operation are when being determined, the flow channel COMM communication of control exhaust, flows through the bypass catalyst that is arranged on the described bypass exhaust passage and then imports the described main exhaust passageway of described main catalytic converter upstream the bypass exhaust passage that makes the described exhaust of discharging from described firing chamber flow into to be arranged on described main catalytic converter upstream.
From disclosing the following detailed description of the preferred embodiment of the invention in conjunction with the accompanying drawings, these and other purposes of the present invention, feature, aspect and advantage will become apparent those skilled in the art.
Description of drawings
Referring now to accompanying drawing as a disclosure original contents part:
Fig. 1 is the structural representation of example that is equipped with the internal-combustion engine of the Exhaust gas purifying device that meets illustrated embodiment;
Fig. 2 is the structural representation of the selected part of described Exhaust gas purifying device shown in Fig. 1 and internal-combustion engine;
Fig. 3 is the cross sectional view of the Exhaust gas purifying device seen of the hatching 3-3 along Fig. 2;
Fig. 4 is a flow chart, illustrate according to first embodiment by the performed bypass catalyst regeneration control procedure of controller that is shown among Fig. 1 and Fig. 2, be used to describe bypass catalyst regeneration control;
Fig. 5 is the very first time figure of the bypass catalyst regeneration control of the controller shown in explanation Fig. 1 and 2;
Fig. 6 is second time diagram of the bypass catalyst regeneration control of the controller shown in explanation Fig. 1 and 2; And
Fig. 7 is a flow chart, and the bypass catalyst regeneration control procedure by the controller execution that is shown in the Exhaust gas purifying device among Fig. 1 and Fig. 2 according to second embodiment is shown, and is used to describe the control of bypass catalyst regeneration.
Embodiment
Description makes an explanation to the selected embodiment of the present invention.It will be apparent for a person skilled in the art that the following description of the embodiment of the invention only is used for example rather than in order to limit the present invention according to present disclosure.
At first referring to Fig. 1, the internal-combustion engine 1 that schematically shows has the Exhaust gas purifying device 2 according to first embodiment.Internal-combustion engine 1 can be traditional internal-combustion engine, and therefore will described internal-combustion engine 1 is not described in detail and/or illustrate.Internal-combustion engine 1 also comprises except miscellaneous part: engine cylinder 1a, cylinder head 1b, a plurality of suction port 1c and a plurality of relief opening 1d.Engine cylinder 1a and cylinder head 1b define a plurality of firing chambers 3.Cylinder head 1b is provided with a plurality of spark plugs 4 and a plurality of Fuelinjection nozzle 5, and a spark plug 4 and a Fuelinjection nozzle 5 are set in each firing chamber 3.
As shown in Figure 2, outlet pipe 6 is connected in the relief opening 1d of cylinder head 1b via flange 6a.Outlet pipe 6 comprises gas exhaust manifold 7a, main exhaust passageway or pipe 7b and communication passage 7c.Described gas exhaust manifold 7a is connected to described relief opening 1d.Main exhaust 7b is assembled in gas exhaust manifold 7a.Communication passage 7c is provided for the arm that fluid is communicated with described gas exhaust manifold 7a.Main catalytic converter 8 is arranged among the main exhaust 7b.Main catalytic converter 8 comprises ternary catalyst purifier or the HC capture catalyst of the HC that for example is used for removing exhaust.
Described bypass outlet pipe 9 is connected to main exhaust 7b in main catalytic converter 8 upstreams.Especially, bypass outlet pipe 9 comprises first end and second end, described first end is connected to main exhaust 7b at the primary importance place of main catalytic converter 8 upstreams by communication passage 7c, and described second end is connected to main exhaust 7b at the second place place of main catalytic converter 8 upstreams.
Flow channel switching valve 11 is arranged among the main exhaust 7b in the point upstream of main exhaust 7b and bypass outlet pipe 9.Described flow channel switching valve 11 constitutes the main passage blocking device.The opening and closing of flow channel switching valve 11 are by integrated manipulator 30 control, make exhaust or mainly flow to main catalytic converter 8 via gas exhaust manifold 7a, or flow to main catalytic converter 8 via communication passage 7c.Specifically, when flow channel switching valve 11 cut out main exhaust 7b, exhaust flowed into described communication passage 7c and flows through bypass catalyst 10 and also purified by bypass catalyst 10 thus.Exhaust after the purification flows into described main catalytic converter 8 then.When main exhaust 7b opened, exhaust flowed into gas exhaust manifold 7a and is purified by main catalytic converter 8.
The layout of flow channel switching valve 11 is not limited to flow channel switching valve wherein and is arranged on above-mentioned layout structure among the main exhaust 7b.The flow channel switching valve also can be arranged on for example point place of gas exhaust manifold 7a and communication passage 7c, as long as layout makes exhaust to switch between gas exhaust manifold 7a and bypass outlet pipe 9.
Described integrated manipulator 30 is provided as control unit of engine (ECU), with the opening and closing of control flow channel switching valve 11 and the serviceability of internal-combustion engine.Described integrated manipulator 30 preferably includes the microcomputer of the engine control procedures with controlling combustion engine serviceability, and is as described below.Described integrated manipulator 30 also comprises other conventional components, as input interface circuit, output interface circuit with such as storage devices such as ROM (ROM (read-only memory)) device and RAM (random access memory) devices.It will be apparent for a person skilled in the art that according to present disclosure the precision architecture of integrated manipulator 30 and algorithm can be any combinations that can carry out the hardware and software of function of the present invention.
Described integrated manipulator 30 is from a plurality of sensor received signals, and described sensor comprises but is not limited to: velocity transducer 31, exhaust gas temperature sensor 32 and air-fuel ratio sensor 33.Specifically, velocity transducer 31 detects the speed of a motor vehicle of vehicle, will represent the vehicle speed signal of the speed of a motor vehicle to output to integrated manipulator 30 then.The temperature of the main exhaust 7b that described exhaust gas temperature sensor 32 detects at main exhaust 7b and bypass outlet pipe 9 point places will indicate row's temperature signal of delivery temperature to output to integrated manipulator 30 then.Air-fuel ratio sensor 33 detects the air fuel ratio of the exhaust in the main exhaust 7b at main exhaust 7b and bypass outlet pipe 9 point places, will indicate the air fuel ratio signal of air fuel ratio to output to described integrated manipulator 30 then.Described air-fuel ratio sensor 33 is arranged at flow channel switching valve 11 downstreams and main catalytic converter 8 upstreams in main exhaust 7b, be used to detect the air fuel ratio of exhaust.
According to the state that opens or closes of the switching valve 11 that flows and consistent with its opening and closing, the ignition timing of the spark plug 4 of described controller 30 control setting in internal-combustion engine, or the fuel quantity and the fuel injection timing that spray by Fuelinjection nozzle 5.
In the Exhaust gas purifying device of as above configuration, the catalyzer that is arranged on as mentioned above in the bypass catalyst 10 in the bypass outlet pipe 9 is activated, and purifying exhaust gas when internal-combustion engine 1 preheating only, but this final vacuum does not import bypass catalyst 10 on one's own initiative.Therefore, when high-temperature discharge gas flowed out from internal-combustion engine, the catalyzer in the main catalytic converter 8 (being set directly at internal-combustion engine 1 downstream) remained under the high temperature usually with respect to the catalyzer in the bypass catalyst 10 that is arranged on vehicle floor below or other positions.Therefore, the catalyzer in the main catalytic converter 8 is difficult for being poisoned by sulphur.
On the other hand, under the situation of the Exhaust gas purifying device 2 of present embodiment, it comprises the catalyst 10 with main exhaust passageway (outlet pipe 6) bypass, and exhaust is caught to flow directly into during starts the bypass catalyst 10 that is set directly at internal-combustion engine 1 downstream.After starting, during normal running, exhaust is switched and flows to main exhaust passageway (outlet pipe 6).Yet, adopt this structure, even the part exhaust also can flow to bypass during normal running.Therefore, even the heat that offers catalyst 10 by the exhaust that flows to bypass exhaust passage 9 reduces, exhaust still will be flow through described bypass exhaust passage 9.In other words, experiment shows, when catalyzer was arranged at bypass, partial discharge gas will be always reach under the state that prevents to poison incident temperature value in temperature and flows through.Thus, in this case, in the catalyzer of bypass catalyst, the amount that sulphur is poisoned can increase.
Described bypass catalyst 10 can be regenerated under the state of the sulphur removal of making a return journey by the serviceability of controlling combustion engine 1.When the temperature height of for example exhaust and internal-combustion engine 1 were in the serviceability of air-fuel ratio, sulphur was removed.Present embodiment provides a kind of method that makes the catalyst regeneration that is arranged at internal-combustion engine, has wherein exempted the sulphur of catalyzer of the bypass catalyst 10 of purifying exhaust gas between warming up period and has poisoned.
Fig. 4 is the flow chart that is used to describe the regeneration control of described bypass catalyst 10.Based on the serviceability or the condition of internal-combustion engine 1, realize regeneration control by controller 30.
At first, in step S1, read the speed of a motor vehicle, and calculate the variation of the speed of a motor vehicle from velocity transducer 31.Subsequently, in step S2, determine whether the speed of a motor vehicle changes is deceleration regime.Under the deceleration situation, processing procedure just proceeds to step S3, otherwise returns step S1.Should " deceleration regime " comprise for example such situation, wherein the driver unclamps throttle or vehicle slides.
In step S3, determine between deceleration period, whether can stop the supply of fuel (that is, whether having set up the condition of fuel shutoff) of internal-combustion engine.Particularly, for example, determine that engine speed is less than or equal to specified value (for example 2000rpm) when discharging throttle, and/or determine whether to have demand such as carrying out operations such as air-conditioning or other auxiliary load.In this case, motor 1 meeting is because of the fuel cut-off stall, so fuel will not cut off.If do not set up the condition of fuel shutoff in step S3, then processing procedure finishes.
When the condition of determining fuel shutoff in step S3 has been set up, in step S4 subsequently, from the output of temperature transducer 32, read delivery temperature, processing procedure proceeds to step S5 then.
In step S5, whether the delivery temperature of determining to be detected more than or equal to set point of temperature Tt, for example more than or equal to 700 ℃ to 800 ℃ set point of temperature.When internal-combustion engine was in the high load operation state before slowing down, delivery temperature was higher relatively.Under the situation of delivery temperature more than or equal to set point of temperature Tt, exhaust will flow into bypass catalyst 10, and definite thus bypass catalyst 10 is under the temperature that can remove sulphur and can regenerates, and then processing procedure proceeds to step S7.
When temperature in step S5 during, carry out rising I. C. engine exhaust temperature controlling less than set point of temperature Tt.Specifically, revise the ignition timing of internal-combustion engine, so that become the timing that the ignition timing when determining than slowing down more postpones.Delivery temperature is owing to the delay of ignition timing raises.Therefore, flow process turns back to step S4 subsequently.Read delivery temperature once more.In step S5, if determine delivery temperature more than or equal to set point of temperature Tt, then processing procedure proceeds to step S7.
By retarded spark timing or more thin by also the target air-fuel ratio of internal-combustion engine 1 being modified to except retarded spark timing, can in the outlet pipe in internal-combustion engine 1 downstream, cause after-burning (after burning), thus can elevated exhaust temperature.Like this, when delivery temperature during more than or equal to set point of temperature Tt, processing procedure proceeds to step S7.
In step S7, fuel sprays and stops.Fuel spray stop after, control just put rules into practice the waiting period, make the catalyst temperature of bypass catalyst 10 exceedingly not raise.Therefore, processing procedure proceeds to step S81 and S82, with put rules into practice the waiting period.Described regulation the waiting period depend on the amount of engine exhaust, but about 1 second time is once determined as rough experimental value.
In the step S81 of present embodiment, whether the timer conter N that is identified for measuring the time after supply of fuel stops is more than or equal to regulation count value Nt.If described timer conter more than or equal to regulation count value Nt, then determine from stop supply of fuel having begun to pass through regulation the waiting period, and owing to the fluctuation that stops the air fuel ratio that supply of fuel causes restrains.If described timer conter does not reach the regulation counting, then in step S82, increase counting, and described flow process turns back to step S81.
In case the waiting period of beginning to have passed through regulation from stopping supply of fuel, then processing procedure proceeds to step S9, at this control flow channel switching valve 11.Implement to switch flow channel switching valve 11 so that remove sulphur in the present embodiment and poison.Particularly, in step S9, flow channel switching valve 11 cuts out, and makes exhaust flow into bypass outlet pipe 9.Have the exhaust of keeping the temperature that is suitable for removing the catalyst temperature that sulphur poisons and therefore be introduced into bypass catalyst 10, and the sulphur that attaches to bypass catalyst 10 is removed.
Be right after fuel spray stop after the part unburned fuel can retain in from the firing chamber 3 of internal-combustion engine 1 and be discharged to the exhaust of relief opening 1d.Simultaneously, before supply of fuel stops, even described flow channel switch valve be that open and normal when making exhaust flow to main exhaust passageway during, partial discharge gas also can flow to the catalyzer of the bypass catalyst 10 in the internal-combustion engine 1 of present embodiment, and part unburned fuel etc. can adhere on the catalyzer of bypass catalyst 10.After and then the fuel injection stops, switching under the situation of described flow channel switching valve 11, be set directly at the internal-combustion engine downstream and have littler thermal capacity so that the temperature of the catalyzer of the described bypass catalyst 10 of promotion temperature rise can surpass the temperature that is suitable for controlling the removal murder by poisoning with respect to primary catalyst.
The regeneration control of carrying out described bypass catalyst 10 is till the speed of a motor vehicle decelerates to the first regulation vehicle velocity V 1 (for example 80km/h).In step S10, read vehicle velocity V with velocity transducer 31, and in step S 11, determine whether the vehicle velocity V that is read is less than or equal to the first regulation vehicle velocity V 1.If the speed of a motor vehicle is less than or equal to the first regulation vehicle velocity V 1, then processor proceeds to step S12.If the speed of a motor vehicle surpasses the first regulation vehicle velocity V 1, then processor returns step S10 so that continue the regeneration of bypass catalyst 10.
In step S12, control described flow channel switching valve 11, and make exhaust flow into described gas exhaust manifold 7a.Thereby the regeneration of bypass catalyst 10 finishes, thereby and the beginning exhaust to the removal of sulphur regeneration of its main catalytic converter 8 that flows.
In step S13, read vehicle velocity V once more, and in step S14, determine whether the vehicle velocity V that is detected is less than or equal to the second regulation vehicle velocity V 2 (for example 4km/h).If the speed of a motor vehicle is less than or equal to the second regulation vehicle velocity V 2, then processor proceeds to step S15, and ignition timing and fuel injection amount are controlled so that enter the idle speed control state of internal-combustion engine 1.
Be in the control of having described present embodiment under the constant deceleration regime at the hypothesis vehicle, but in control procedure when for example switching to acceleration mode, bypass catalyst regeneration control is interrupted.Can be according to carrying out regeneration control elapsed time or the distance of advancing since last time or determining whether to carry out the regeneration control of bypass catalyst 10 according to the amount of when control begins, slowing down or the speed of a motor vehicle.Under the low speed of a motor vehicle (for example 40km/h), when catalyst regeneration begins, carry out flow channel and be easy to especially between transfer period impact, under the described low speed of a motor vehicle, should in step S9, not switch described flow channel switching valve 11.Therefore, the speed between about 80km/h and the 40km/h is wished as the first regulation speed of a motor vehicle.When not being used to control when the bypass catalyzer is removed the flow channel of poisoning and switched, high temperature, lean burn exhaust (lean-bumingexhaust) are introduced into main catalytic converter 8, and the sulphur of main catalytic converter 8 is removed.
Fig. 5 is a very first time chart, shows the time series that the various factors of the regeneration control of accompanying bypass catalyst 10 changes.
When vehicle when t1 enters deceleration regime constantly, very fast ignition timing is revised, and delivery temperature raises.When delivery temperature arrives set point of temperature Tt (t2 constantly), fuel sprays and stops, and put rules into practice the waiting period up to through equaling the amount of time of regulation count value Nt.In the section, delivery temperature is maintained at or is higher than the temperature T t of regulation at this moment.The waiting period of regulation,, switch described flow channel switching valve 11, and make described exhaust flow into bypass outlet pipe 9 at moment t3 past tense.The regeneration of described bypass catalyst 10 begins thus.
The regeneration of carrying out described bypass catalyst 10 reaches the first regulation vehicle velocity V 1 (t4 constantly) up to vehicle velocity V.In case vehicle velocity V reaches the first regulation vehicle velocity V 1, just the flow channel switching valve is controlled, make blast air cross gas exhaust manifold 7a, and finish the regeneration control of described bypass catalyst 10.
After this, when vehicle velocity V after when reaching the second regulation vehicle velocity V 2 (constantly t5), internal-combustion engine enters idling mode and forbids to stall.Vehicle stops at moment t6.
Therefore when vehicle deceleration, the flow channel switching valve in the present embodiment is controlled, and makes lean burn exhaust flow into bypass outlet pipe 9.The sulphur that is arranged in the catalyzer of the bypass catalyst 10 in the bypass outlet pipe 9 is removed thus, and catalyzer is regenerated.When removing the sulphur of bypass catalyst 10, ignition timing is corrected and delay and fuel spray and stops, thereby delivery temperature raises, and can remove the sulphur of described bypass catalyst 10 reliably.
Through after the specified time period, execution opens and closes the control of flow channel switching valve 11 after the fuel injection stops, and empty combustion gas is minimized than the influence of fluctuating after the fuel injection stops thus.
The air fuel ratio that is detected by air-fuel ratio sensor 33 illustrates in the bottom in the time chart of Fig. 5.Air-fuel ratio feedback control makes air fuel ratio be essentially chemically correct fuel before moment t1.Yet, since from moment t1 to moment t2 the time disconnected during fuel injection amount minimizing and owing to stop (segment) in the injection of moment t2 fuel, air fuel ratio enters from the trend of chemically correct fuel state to rare state-transition.
Though the supply of fuel of motor 1 stops at moment t2 place, the output of air-fuel ratio sensor 33 is disconnected during corresponding to the regulation after the moment t2, promptly become rare output boundary (for example value is 30 air fuel ratio) quite rare or that reached air-fuel ratio sensor 33 up to air fuel ratio before up to fuel mixture, it is rare not indicating air fuel ratio.This shows because the exhaust that burning produces is still being flowed out motor 1, even and supply of fuel be cut off, exhaust does not immediately stop to contain fuel.If flow channel switching valve 11 switches under these conditions, the exhaust that contains unburned fuel so will flow into bypass catalyst 10 and and catalyst reaction, may cause catalyst temperature excessively to raise.
Therefore, in this embodiment, in the past flow channel switching valve 11 cuts out, thereby prevents that catalyst temperature from excessively raising during amount the stipulated time after moment t2 place stops in supply of fuel.In this embodiment, constantly the air fuel ratio that is set at exhaust of the stipulated time amount (equaling regularly the amount of time of phase counting Nt) after the t2 becomes stable amount of time.More specifically say, as shown in the time chart of Fig. 5, set for up to close flow channel switching valve 11 stipulated time amount in the past at the moment t3 place when t2 stops fuel from the moment, make the air fuel ratio that flows to the exhaust of main exhaust 7b from motor 1 only can suppose basically just air.During this stipulated time amount, the air fuel ratio of exhaust is stable at predetermined range (t3 constantly).
Also acceptablely be, to measure the stipulated time according to the characteristic of sensor and to be set at the time of exporting the required amount of time of its rare output threshold value above sensor, or for example be set at the time that air fuel ratio surpasses regulation air fuel ratio threshold value (for example 30), under this regulation air fuel ratio threshold value, can suppose only be that air is flowing basically.
When the described speed of a motor vehicle reaches the first regulation vehicle velocity V 1, control described flow channel switching valve 11, and make exhaust flow into gas exhaust manifold 7a, can switch the sulphur that removes main catalytic converter 8 thus.In the present embodiment, when between deceleration period, having set up the rated condition of fuel shutoff, flow channel switching valve 11 is switched and makes exhaust to flow to the catalyzer of bypass catalyst 10, but only when detecting the rated condition that is used to calculate the toxic dosage relevant and when having set up the rated condition of toxic dosage with the toxic dosage of described bypass catalyst, described flow channel switching valve 11 also can be closed, and makes exhaust flow into described bypass exhaust passage 9.
The toxic dosage of the catalyzer in the bypass catalyst 10 is along with elapsed time when flow channel switching valve 11 is opened and increase or increase with accumulative total operating time of internal-combustion engine 1 simply.Therefore these periods are the parameters relevant with the toxic dosage of bypass catalyst 10.In case exhaust arrives high temperature, then the toxic dosage of the catalyzer in the bypass catalyst 10 degree that can be extended with the recovery time reduces, and therefore when flow channel switching valve 11 cuts out the device elapsed time also be the parameter relevant with the toxic dosage of bypass catalyst 10.
Flow channel switching valve 11 is not to continue to cut out and flow channel switching valve 11 only surpasses rated condition and detects in the structure of just cutting out when slowing down at toxic dosage during vehicle deceleration therein, compare with the situation that valve all switches when slowing down at every turn, the number of times that flow channel switching valve 11 switches can reduce.The wear life of described flow channel switching valve 11 can be set to longer thus, and can improve the wear life of valve as Exhaust gas purifying device, and this also is favourable from the cost angle.
Present embodiment has such structure, and wherein said bypass outlet pipe 9 is connected to main exhaust 7b between described flow channel switching valve 11 and main catalytic converter 8, and the exhaust that flows into bypass outlet pipe 9 thus is introduced into main catalytic converter 8.As a result, even when internal-combustion engine 1 preheating, main catalytic converter 8 also can be deflated heating.
Fig. 6 is second time chart, and the time series that the various factors of the regeneration control of accompanying bypass catalyst 10 changes is shown.
Second time chart part different with the very first time chart of Fig. 5 is: slowing down when determining, delivery temperature is higher than Tt.When internal-combustion engine 1 had continued to reach a certain degree under high load operation before determining deceleration, this situation was associated especially.Because delivery temperature is higher than Tt when determining slowing down, therefore in the ignition timing of spark plug 4 or be used to increase delivery temperature and other actions of carrying out are not done to stop fuel under the situation of any delay and sprayed.Equally in this case, fuel spray do temporarily to pause after stopping and making the stipulated time in the past after, carry out the switching of flow channel switching valve 11, and therefore fuel sprays the influence that stops the fluctuation of air fuel ratio afterwards and is minimized.Therefore, can prevent that the temperature of the catalyzer of described bypass catalyst 10 from surpassing the temperature that is suitable for controlling the removal murder by poisoning, and poison to remove and carried out.
Referring now to Fig. 7, will discuss to the modification control of described controller 30.In first embodiment, timer conter is used for determining the endurance of specified time period in step S81, but replaces determining the time in the past, can determine also whether the air fuel ratio of exhaust has reached steady state.Particularly, in the flow chart of Fig. 7, the step S81 of Fig. 4 flow chart and S82 are substituted by step S8.Alternative steps S81 and S82, the air-fuel ratio sensor 33 of available main catalytic converter 8 upstreams reads the air fuel ratio of exhaust, and can determine that steady state that whether described air fuel ratio reached regulation (for example, whether air fuel ratio shows dilution up to specification, or whether air fuel ratio has stablized and whether the variable quantity of time per unit is in predetermined range or approximates 0).
Thus, in second embodiment's shown in Figure 7 processing procedure, second embodiment's step S1 to S7 and S9 to S15 are identical with step S1 to S7 and S9 to S15 among first embodiment.In step S8, the air fuel ratio of exhaust reads by the air-fuel ratio sensor 33 of main catalytic converter 8 upstreams, and whether definite air fuel ratio reaches the steady state of regulation.
Although only selected selected embodiment that the present invention is described, it will be apparent for a person skilled in the art that not breaking away under the scope of the invention situation according to present disclosure and can make various changes and modification.For example, the size of various parts, shape, position or direction all can on demand and/or be expected to change.Be shown as the parts that are connected to each other directly or contact and have setting intermediate structure therebetween.The function of an element can be carried out by two elements, and vice versa.An embodiment's function and structure can be used among other embodiments.Needn't in a certain specific embodiment, have all advantages simultaneously.With other each specific characteristic of prior art phase region, self or with the combining of other features, also should be counted as claimant's the further description respectively of invention, comprise the structure and/or the concept of function of this kind feature instantiation.Thus, only be used for explaining according to the aforementioned description of the embodiment of the invention, and not in order to limit the invention.
Claims (16)
1. catalyst regeneration controlling method that is used for the Exhaust gas purifying device of vehicle comprises:
Exhaust is directed to the main catalytic converter that is arranged on the main exhaust passageway from the firing chamber of internal-combustion engine;
Determine the generation of vehicle deceleration state;
Determine during described vehicle deceleration state, to be used to stop the foundation of at least one condition of the supply of fuel of described internal-combustion engine;
When determining to have set up the described condition that stops the motor fuel supply, carry out fuel cut-off operation; And
When one of two conditions that reached steady state through the air fuel ratio of specified time period or described exhaust after the described fuel cut-off operation of execution after carrying out described fuel cut-off operation are determined, the flow channel COMM communication of control exhaust, flows through the bypass catalyst that is arranged on the described bypass exhaust passage and then imports the described main exhaust passageway of described main catalytic converter upstream the bypass exhaust passage that makes the described exhaust of discharging from described firing chamber flow into to be arranged on described main catalytic converter upstream.
2. the catalyst regeneration controlling method described in claim 1 wherein, also comprises:
Be between deceleration period and before the described fuel cut-off operation, the ignition timing that postpones described internal-combustion engine is with elevated exhaust temperature at described vehicle.
3. the catalyst regeneration controlling method described in claim 1 wherein, also comprises
With the air-fuel ratio correction of described internal-combustion engine is the rarer value of air fuel ratio that produces before determining than deceleration regime, during the described deceleration regime and carry out the correction of described air fuel ratio before the described fuel cut-off operation.
4. the catalyst regeneration controlling method described in claim 1, wherein
Closing the period of keeping regulation of described flow channel COMM communication, the period of this regulation, this period finished when the fuel from described engine exhaust to described catalyzer no longer exists corresponding to such period.
5. the catalyst regeneration controlling method described in claim 1, wherein
Describedly stop supply of fuel and be included in the fuel that stops when having determined described deceleration regime and definite delivery temperature in the described internal-combustion engine and spray more than or equal to set point of temperature.
6. the catalyst regeneration controlling method described in claim 1 wherein, also comprises
When definite speed of a motor vehicle is reduced to the regulation speed of a motor vehicle, open described flow channel COMM communication, make to flow into described main exhaust passageway from the exhaust of described firing chamber discharging.
7. the catalyst regeneration controlling method described in claim 1, wherein
Closing the period of keeping described regulation of described flow channel COMM communication.
8. the catalyst regeneration controlling method described in claim 1, wherein
When reaching described steady state, the air fuel ratio of described exhaust closes described flow channel COMM communication.
9. Exhaust gas purifying device comprises:
Main exhaust passageway, described main exhaust passageway is communicated with at least one relief opening fluid of at least one firing chamber of vehicle internal combustion engine;
Main catalytic converter, described main catalytic converter are arranged in the described main exhaust passageway;
The bypass exhaust passage that comprises first end and second end, described first end is connected with described main exhaust passageway at the primary importance place of described main catalytic converter upstream, and described second end is connected with described main exhaust passageway at the second place place of described main catalytic converter upstream;
The bypass catalyst is in the described bypass exhaust passage that described bypass catalyst is provided with between described first end and second end;
The flow channel COMM communication, described flow channel COMM communication is arranged in the described main exhaust row passage, optionally to open and close described main exhaust passageway, make that the exhaust from the discharging of described firing chamber flows into described bypass exhaust passage when described flow channel COMM communication is closed;
Controller, when the rated condition that exists deceleration regime and at least one item to be used to carry out fuel cut-off operation in determining described vehicle was satisfied, described controller stopped the supply of fuel to described internal-combustion engine;
One of two conditions that the air fuel ratio of specified time period or described exhaust after the described fuel cut-off operation of execution reached steady state after carrying out described fuel cut-off operation, pass by when being determined, described controller is controlled the flow channel COMM communication of described exhaust, the bypass exhaust passage that makes the described exhaust of discharging from described firing chamber flow into to be arranged on described main catalytic converter upstream, flows through the bypass catalyst that is arranged on the described bypass exhaust passage and then imports the described main exhaust passageway of described main catalytic converter upstream.
10. the Exhaust gas purifying device described in claim 9, wherein
Described controller is also in order to during the described vehicle deceleration and before the described fuel cut-off operation, and the ignition timing that postpones described internal-combustion engine is with elevated exhaust temperature.
11. the Exhaust gas purifying device described in claim 9, wherein, described controller is the rarer value of air fuel ratio that produces before determining than deceleration regime in order to the air-fuel ratio correction with described internal-combustion engine also, during the described deceleration regime and carry out the correction of described air fuel ratio before the described fuel cut-off operation.
12. the Exhaust gas purifying device described in claim 9, wherein, described controller is also in order to the period with described flow channel COMM communication closed rule, and the period of this regulation finishes when the fuel from described engine exhaust to described bypass catalyst no longer exists.
13. the Exhaust gas purifying device described in claim 9, wherein, described controller has been also in order to when having determined described deceleration regime and definite delivery temperature more than or equal to set point of temperature, sprays and stops supply of fuel by stopping fuel in the described internal-combustion engine.
14. the Exhaust gas purifying device described in claim 9, wherein, described controller also in order to when definite speed of a motor vehicle is reduced to the regulation speed of a motor vehicle, is opened described flow channel COMM communication, makes to flow into described main exhaust passageway from the exhaust of described firing chamber discharging.
15. the Exhaust gas purifying device described in claim 9, wherein, described controller is also in order to close described flow channel COMM communication the period of described regulation.
16. the Exhaust gas purifying device described in claim 9 wherein, cuts out described flow channel COMM communication when described controller also reaches described steady state in order to the air fuel ratio when described exhaust.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP292251/06 | 2006-10-27 | ||
| JP2006292251 | 2006-10-27 | ||
| JP245383/07 | 2007-09-21 |
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| Publication Number | Publication Date |
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| CN101169060A true CN101169060A (en) | 2008-04-30 |
| CN100570131C CN100570131C (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007101679185A Expired - Fee Related CN100570131C (en) | 2006-10-27 | 2007-10-26 | The catalyst regeneration controlling method of Exhaust gas purifying device and Exhaust gas purifying device |
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| CN (1) | CN100570131C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817676A (en) * | 2011-06-09 | 2012-12-12 | 通用汽车环球科技运作有限责任公司 | Method for operating a spark-ignition, direct-injection internal combustion engine |
| CN104373233A (en) * | 2013-08-15 | 2015-02-25 | 福特环球技术公司 | Two-stage catalyst regeneration |
| CN105899789A (en) * | 2014-01-10 | 2016-08-24 | 丰田自动车株式会社 | Control system of internal combustion engine |
| CN108150296A (en) * | 2017-12-27 | 2018-06-12 | 潍柴动力股份有限公司 | Binary channels SCR catalytic convention designs and its control method |
| CN109693661A (en) * | 2017-10-20 | 2019-04-30 | 铃木株式会社 | The control device of vehicle |
-
2007
- 2007-10-26 CN CNB2007101679185A patent/CN100570131C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817676A (en) * | 2011-06-09 | 2012-12-12 | 通用汽车环球科技运作有限责任公司 | Method for operating a spark-ignition, direct-injection internal combustion engine |
| CN102817676B (en) * | 2011-06-09 | 2015-09-23 | 通用汽车环球科技运作有限责任公司 | The method of operation spark-ignited direct injection explosive motor |
| CN104373233A (en) * | 2013-08-15 | 2015-02-25 | 福特环球技术公司 | Two-stage catalyst regeneration |
| CN105899789A (en) * | 2014-01-10 | 2016-08-24 | 丰田自动车株式会社 | Control system of internal combustion engine |
| CN105899789B (en) * | 2014-01-10 | 2018-12-07 | 丰田自动车株式会社 | The control system of internal combustion engine |
| CN109693661A (en) * | 2017-10-20 | 2019-04-30 | 铃木株式会社 | The control device of vehicle |
| CN109693661B (en) * | 2017-10-20 | 2022-03-01 | 铃木株式会社 | Vehicle control device |
| CN108150296A (en) * | 2017-12-27 | 2018-06-12 | 潍柴动力股份有限公司 | Binary channels SCR catalytic convention designs and its control method |
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| Publication number | Publication date |
|---|---|
| CN100570131C (en) | 2009-12-16 |
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