CN104265423A - Tail gas catalysis system and tail gas catalysis control method - Google Patents
Tail gas catalysis system and tail gas catalysis control method Download PDFInfo
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- CN104265423A CN104265423A CN201410510915.7A CN201410510915A CN104265423A CN 104265423 A CN104265423 A CN 104265423A CN 201410510915 A CN201410510915 A CN 201410510915A CN 104265423 A CN104265423 A CN 104265423A
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Abstract
The invention discloses a tail gas catalysis system and a tail gas catalysis control method. The situation that a catalyst is extremely weak in catalysis capability before startup of an engine can be eliminated while the catalysis capability of the catalyst is fully and efficiently utilized within a full rotating speed region of the engine. The tail gas catalysis system comprises a tail gas flow path in which a tail gas pipe, a catalysis device tank and a tail gas exhaust pipe are arranged, and a tail gas heating bypath in which a tail gas heating inlet pipe, a tail gas storage tank and a heated tail gas exhaust pipe are arranged; in the tail gas heating bypath, a first single-way stop valve is arranged in the tail gas heating inlet pipe; a compression pump is arranged at the position of the tail gas heating inlet pipe which is closer to a connecting part of the tail gas storage tank than the first single-way stop valve; a controllable valve is arranged in the tail gas storage tank.
Description
Technical field
The present invention relates to a kind of tail gas catalyzed system and tail gas catalyzed controlling method, particularly use CO, HC and NO that catalyzer will be discharged in vehicle exhaust by oxidation and reduction
xthe tail gas catalyzed system of harmless carbon dioxide, water and nitrogen and tail gas catalyzed controlling method is changed into Deng harmful gas.
Background technique
Tail gas catalyzed system is must obligato purification plant in motor vehicle exhaust emission process, its CO, HC and NO that can will discharge as tail gas after air and automobile burn within the engine
xharmless carbon dioxide, water and nitrogen is changed into by oxidation and reduction etc. harmful automobile.
As the tail gas catalyzed system of existing motor, such as, disclose in patent documentation 1 (Japanese Patent Laid-Open 6-212958) when after the engine started after the stipulated time, when catalyzer does not still reach the temperature of regulation, by importing the technology that extraneous gas heats catalyzer.
But, in above-mentioned patent documentation 1, still there is following technical problem:
● at the low-speed region of motor, because tail gas amount is less, the honeycomb catalyst carrier in catalyzer has part to fail to contact with tail gas, therefore, causes catalyst ability superfluous.On the other hand, at the high-speed region of motor, because tail gas amount is larger, flow velocity is fast, causes the time of contact of tail gas and catalyzer shorter and can flow through catalyst converter tank fast, therefore, cause the catalyst scarce capacity in high speed area, and then have a strong impact on purification efficiency.
● because catalyzer just starts activation when delivery temperature reaches 300 DEG C, therefore, when delivery temperature is lower than 300 DEG C, the catalytic capability of catalyzer is extremely weak, causes motor to worsen at the exhaust emissions of startup and idling initial stage.
Therefore, how can all fully effectively utilize catalyst ability and how eliminate the catalyzer situation that catalytic capability is extremely weak before an engine is started in the full rotary speed area of motor and just become technical problem urgently to be resolved hurrily.
Summary of the invention
The present invention is for solving the problems of the technologies described above and doing, its object is to provide a kind of tail gas catalyzed system and tail gas catalyzed controlling method, it eliminates the catalyzer situation that catalytic capability is extremely weak before an engine is started while all fully effectively utilizing catalyst ability in the full rotary speed area of motor.
The feature of the tail gas catalyzed system of first technological scheme of a first aspect of the present invention is, comprise: tail gas stream, offgas duct, catalyst converter tank and tail gas discharging pipe is provided with in this tail gas stream, wherein, one end of above-mentioned offgas duct is connected with the exhaust port of motor, the other end of above-mentioned offgas duct is connected with one end of above-mentioned catalyst converter tank, in above-mentioned catalyst converter tank, store catalyzer, and the tail gas after the catalyst in catalyst converter tank is discharged by above-mentioned tail gas discharging pipe, and tail gas heating bypass, tail gas heating suction tude is provided with in this tail gas heating bypass, tail gas storage tank and heating exhaust pipe, wherein, one end of above-mentioned tail gas heating suction tude and the above-mentioned offgas duct of above-mentioned tail gas stream, part by the exhaust port side of above-mentioned motor connects, the other end of above-mentioned tail gas heating suction tude is connected with above-mentioned tail gas storage tank, one end of above-mentioned heating exhaust pipe is connected with above-mentioned tail gas storage tank, the other end of above-mentioned heating exhaust pipe and the offgas duct of above-mentioned tail gas stream, part by above-mentioned catalyst converter tank side connects, in above-mentioned tail gas heating bypass, the midway of above-mentioned tail gas heating suction tude is provided with the first unidirectional stop valve, in above-mentioned tail gas heating suction tude, the position storing tank connected attachment portion with above-mentioned tail gas is more leaned on than above-mentioned first unidirectional stop valve, be provided with compressor pump, controllable valve is provided with in above-mentioned tail gas storage tank.
The tail gas catalyzed system of second technological scheme of a first aspect of the present invention is on the basis of the tail gas catalyzed system of the first technological scheme in a first aspect of the present invention, it is characterized in that, in the above-mentioned tail gas storage tank of above-mentioned tail gas heating bypass, be provided with heater circuit.
The tail gas catalyzed system of the 3rd technological scheme of a first aspect of the present invention is on the basis of the tail gas catalyzed system of the second technological scheme in a first aspect of the present invention, it is characterized in that, above-mentioned heater circuit comprises heater circuit switch, metal-oxide-semiconductor current amplifier and resistance wire.
The tail gas catalyzed system of the 4th technological scheme of a first aspect of the present invention is on the basis of the tail gas catalyzed system of the first technological scheme in a first aspect of the present invention, it is characterized in that, in tail gas stream, than the attachment portion be connected with the above-mentioned tail gas heating suction tude of above-mentioned tail gas heating bypass slightly by the position in downstream, be provided with open-close type valve.
The tail gas catalyzed system of the 5th technological scheme of a first aspect of the present invention is on the basis of first technological scheme of a first aspect of the present invention or the tail gas catalyzed system of the second technological scheme, it is characterized in that, in above-mentioned tail gas storage tank, be also provided with machine security Decompression valves, pressure transducer and temperature transducer, the midway of above-mentioned heating exhaust pipe is provided with the second unidirectional stop valve.
The tail gas catalyzed controlling method of first technological scheme of a second aspect of the present invention uses the catalysis of tail gas catalyzed system to tail gas of the 5th technological scheme of a first aspect of the present invention to control, it is characterized in that, before above-mentioned motor powers on and not yet starts, utilize the compression of above-mentioned compressor pump, or utilize the heat effect of the compression of above-mentioned compressor pump and above-mentioned heater circuit, the air be stored in above-mentioned tail gas storage tank is heated, during the activation temperature of the air temperature in above-mentioned tail gas storage tank higher than above-mentioned catalyzer, the air of above-mentioned tail gas storage tank is introduced above-mentioned catalyst converter tank and the catalyzer in above-mentioned catalyst converter tank is heated.
The tail gas catalyzed controlling method of second technological scheme of a second aspect of the present invention is on the basis of the tail gas catalyzed controlling method of the first technological scheme in a second aspect of the present invention, it is characterized in that, at above-mentioned engine start, during idling, above-mentioned open-close type valve is closed, utilize the compression of above-mentioned compressor pump, or utilize the heat effect of the compression of above-mentioned compressor pump and above-mentioned heater circuit, the tail gas be stored in above-mentioned tail gas storage tank is heated, after exhaust temperature in above-mentioned tail gas storage tank reaches 300 DEG C, wait for the stipulated time, after the afore mentioned rules time, above-mentioned controllable valve is made to carry out switch motion.
In addition, in the tail gas catalyzed controlling method of second technological scheme of a second aspect of the present invention, the switch motion of above-mentioned controllable valve is by the primary importance of above-mentioned offgas duct, namely above-mentioned tail gas stream is positioned at, the relation between the exhaust flow of position in exhaust gas flow downstream side and the theoretical delivery of catalytic effect the best is more leaned on to carry out than the attachment portion be connected with the above-mentioned heating exhaust pipe of above-mentioned tail gas heating bypass, when the exhaust flow of the primary importance of above-mentioned offgas duct is less than above-mentioned theory flow, increase the aperture of above-mentioned controllable valve gradually, when the exhaust flow of the primary importance of above-mentioned offgas duct is more than above-mentioned theory flow, reduce the aperture of above-mentioned controllable valve gradually.
The tail gas catalyzed controlling method of the 3rd technological scheme of a second aspect of the present invention is on the basis of the tail gas catalyzed controlling method of the first technological scheme in a second aspect of the present invention, it is characterized in that, when motor is in normal operation, above-mentioned open-close type valve is opened, in the second place of above-mentioned offgas duct, namely above-mentioned tail gas stream is positioned at, when more leaning on the exhaust flow of the position of exhaust gas flow upstream side to be greater than above-mentioned theory flow than the attachment portion be connected with the above-mentioned tail gas heating suction tude of above-mentioned tail gas heating bypass, be judged as that the catalytic capability of the catalyzer of above-mentioned catalyst converter tank is not enough, when the exhaust flow of the second place of above-mentioned offgas duct is less than above-mentioned theory flow, be judged as that the catalytic capability of the catalyzer of above-mentioned catalyst converter tank is superfluous.
The tail gas catalyzed controlling method of the 4th technological scheme of a second aspect of the present invention is on the basis of the tail gas catalyzed controlling method of the first technological scheme in a second aspect of the present invention, it is characterized in that, when above-mentioned catalytic capability is not enough, by the relation between the exhaust flow of the primary importance of above-mentioned offgas duct and above-mentioned theory flow, control the exhaust capacity of above-mentioned compressor pump, when the exhaust flow of the primary importance of above-mentioned offgas duct is greater than above-mentioned theory flow, increase the exhaust capacity of above-mentioned compressor pump, when the exhaust flow of the primary importance of above-mentioned offgas duct is below above-mentioned theory flow, reduce the exhaust capacity of above-mentioned compressor pump.
In addition, in the tail gas catalyzed controlling method of the 4th technological scheme of a second aspect of the present invention, when above-mentioned catalytic capability is superfluous, by the relation between the exhaust flow of the primary importance of above-mentioned offgas duct and above-mentioned theory flow, control the aperture of above-mentioned controllable valve, when the exhaust flow of the primary importance of above-mentioned offgas duct is less than above-mentioned theory flow, increase the aperture of above-mentioned controllable valve gradually, when the exhaust flow of the primary importance of above-mentioned offgas duct is more than above-mentioned theory flow, reduce the aperture of above-mentioned controllable valve gradually.
The tail gas catalyzed controlling method of the 5th technological scheme of a second aspect of the present invention is on the basis of the tail gas catalyzed controlling method of the arbitrary technological scheme in the 4th technological scheme in first technological scheme of a second aspect of the present invention, it is characterized in that, when the force value that the pressure transducer being located at above-mentioned tail gas storage tank detects is greater than the utmost carrying ability force value of above-mentioned tail gas storage tank, open above-mentioned safety relief valve.
According to tail gas catalyzed system of the present invention and tail gas catalyzed controlling method, when vehicle launch, the catalyzer in catalyst converter tank has reached 300 DEG C, therefore, compared with prior art, the catalyzer technical problem that catalytic capability is extremely weak before an engine is started can be solved.
According to tail gas catalyzed system of the present invention and tail gas catalyzed controlling method, by when tail gas amount is too much, partial tail gas compression is stored in tail gas storage tank, when tail gas amount is less, suitably the tail gas in tail gas storage tank is discharged, by this, in the full rotary speed area of motor, all fully catalyst ability can effectively be utilized.
Accompanying drawing explanation
Fig. 1 is the integrally-built schematic diagram of the tail gas catalyzed system representing embodiment of the present invention.
Fig. 2 represents before activation, the schematic diagram of the action (working procedure 1 of tail gas catalyzed system) of the tail gas heating bypass that the tail gas catalyzed system of embodiment of the present invention has and associated components.
Fig. 3 represents in startup, idling stage, the schematic diagram of the action (working procedure 2 of tail gas catalyzed system) of the tail gas heating bypass that the tail gas catalyzed system of embodiment of the present invention has and associated components.
Fig. 4 represents in startup, idling stage, the schematic diagram of the action (working procedure 2 of tail gas catalyzed system) of the tail gas heating bypass that the tail gas catalyzed system of embodiment of the present invention has and associated components.
Fig. 5 is the figure of the effect of the heatable catalyst represented in the working procedure 1 of above-mentioned tail gas catalyzed system and working procedure 2.
Fig. 6 is the schematic diagram of the working procedure 3 (storage compartment tail gas) of the tail gas catalyzed system representing embodiment of the present invention.
Fig. 7 is the schematic diagram of the working procedure 4 (tail gas that discharge unit stores) of the tail gas catalyzed system representing embodiment of the present invention.
Fig. 8 is that the system represented in the working procedure 3 of above-mentioned tail gas catalyzed system and working procedure 4 stores, the effect of emission.
Fig. 9 is the control flow chart of the tail gas catalyzed system of embodiment of the present invention.
Embodiment
Below, with reference to Fig. 1 ~ Fig. 8, the overall structure of the tail gas catalyzed system of embodiment of the present invention and action are described in detail.
Fig. 1 is the integrally-built schematic diagram of the tail gas catalyzed system 100 representing embodiment of the present invention.
As shown in Figure 1, the tail gas catalyzed system 10 of motor E comprises: tail gas stream 100, offgas duct 110, catalyst converter tank 120 and tail gas discharging pipe 130 is provided with in this tail gas stream 100, wherein, one end of above-mentioned offgas duct 110 is connected with the exhaust port of motor E, the other end of above-mentioned offgas duct 110 is connected with one end of catalyst converter tank 120, store the catalyzer for carrying out catalysis to tail gas in above-mentioned catalyst converter tank 120, the tail gas (clean tail gas) after the catalyst in catalyst converter tank 120 is discharged by above-mentioned tail gas discharging pipe 130, and tail gas heating bypass 200, tail gas heating suction tude 210 is provided with in this tail gas heating bypass 200, tail gas storage tank 220 and heating exhaust pipe 230, wherein, one end of above-mentioned tail gas heating suction tude 210 and the offgas duct 110 of above-mentioned tail gas stream 100, part by the exhaust port side of motor E connects, the other end is connected with tail gas storage tank 220, the tail gas do not heated for being discharged by the exhaust port from motor E introduces tail gas storage tank 220, one end of above-mentioned heating exhaust pipe 230 is connected with tail gas storage tank 220, the offgas duct 110 of the other end and above-mentioned tail gas stream 100, part by catalyst converter tank 120 side connects, for the tail gas after tail gas storage tank 220 heats is discharged.
Tail gas stream 100, than the position of the attachment portion be connected with the tail gas heating suction tude 210 of tail gas heating bypass 200 slightly by downstream, be provided with open-close type valve m.Be provided with unidirectional stop valve a (the first unidirectional stop valve) in the midway of tail gas heating suction tude 210, tail gas only can enter tail gas storage tank 220 via tail gas heating suction tude 210.In addition, tail gas heating suction tude 210, the position of attachment portion of unidirectional stop valve a more by being connected with tail gas storage tank 220 is provided with compressor pump (variable capacity compressor pump) b.
Heater circuit (heater circuit switch d, metal-oxide-semiconductor current amplifier e, resistance wire f), machine security Decompression valves c, pressure transducer g, temperature transducer i and controllable valve j is provided with in the tail gas storage tank 220 of tail gas heating bypass 200.
The midway of heating exhaust pipe 230 is provided with unidirectional stop valve k (the second unidirectional stop valve), and tail gas only can be discharged from tail gas storage tank 220 via heating exhaust pipe 230.
Fig. 2 represents before motor E starts, the schematic diagram of the action (working procedure 1 of tail gas catalyzed system 10) of the tail gas heating bypass 200 that tail gas catalyzed system 10 has and associated components (compressor pump b, machine security Decompression valves c, heater circuit switch d, controllable valve j and open-close type valve m etc.).
As shown in Figure 2, before upper electrical switch is opened while being "Off" (namely, upper electrical switch), open-close type valve m opens, and air temperature is in normal temperature, and compressor pump b closes simultaneously, and heater circuit switch d opens, and controllable valve j closes.
Such as, after upper electrical switch is opened (namely, upper electrical switch is when being "ON", and now motor starts not yet, rotates car key, makes vehicle be energized), open-close type valve m opens, and controllable valve j closes.Now, compressor pump b is changed into from closedown and opens, heater circuit switch d is changed into from closedown and opens, thus by heater circuit, the air in tail gas storage tank 220 is heated.
After utilizing temperature transducer i to detect that the air temperature in tail gas storage tank 220 reaches the activation temperature (300 DEG C) of catalyzer, closes compression pump b, closedown heater circuit switch d, and controllable valve j is opened, tail gas in tail gas storage tank 220 is stored in (now to utilize, because motor not yet starts, be therefore still the air after heating) catalyzer in catalyst converter tank 120 is heated.
Before an engine is started, because offgas duct 110 internal memory leaves large quantity of air, by heating air, thus catalyst temperature can be made to be promoted to activation temperature (about 300 DEG C) as early as possible, by this, before can utilizing engine start, air is heated, make the activate of catalyzer in advance.
In the working procedure 1 of tail gas catalyzed system 10, carry out following action:
(1) by the suction of compressor pump b, the air in offgas duct is pumped in tail gas storage tank 220, and air is compressed.A large amount of heat can be produced in air compressing process, thus the air in tail gas storage tank 220 is heated.
(2) by the resistance wire f evolution of heat in heater circuit, the air in tail gas storage tank 220 is heated.
(3) after the air temperature in tail gas storage tank 220 reaches 300 DEG C, by tail gas storage tank 220 by the air venting that heats to catalyst converter tank 120 place, with the catalyzer in heatable catalytic converter tank 120.
Fig. 3 and Fig. 4 represents in motor E startup, idling stage, the schematic diagram of the action (working procedure 2 of tail gas catalyzed system 10) of the tail gas heating bypass 200 that tail gas catalyzed system 10 has and associated components (compressor pump b, machine security Decompression valves c, heater circuit switch d, controllable valve j and open-close type valve m etc.).
Composition graphs 1, Fig. 3 and Fig. 4 are known, assuming that be that the catalytic effect of the catalyzer of θ g/min is best through the exhaust flow of catalyst converter tank 120.Owing to depositing the problem of catalytic capability surplus and the catalytic capability deficiency mentioned in the introduction in catalytic process, therefore, tested by catalyst performance, can know the concrete numerical value of θ, namely θ is constant.
In addition, the ECU of motor E evaluates offgas duct A place (as shown in Figure 1 by rotating speed and load, be positioned at tail gas stream 100, than the attachment portion be connected with the tail gas heating suction tude 210 of tail gas heating bypass 200 more by the position A of exhaust gas flow upstream side) exhaust flow, be such as β g/min.
In addition, the ECU of motor E is by the force value of the pressure transducer g in tail gas heating bypass 200, and in conjunction with the aperture of controllable valve j and/or the opening value of variable capacity compressor pump b, evaluate offgas duct B place (as shown in Figure 1, be positioned at tail gas stream 100, than the attachment portion be connected with the heating exhaust pipe 230 of tail gas heating bypass 200 more by the position B in exhaust gas flow downstream side) exhaust flow, be such as γ g/min.
When motor E starts, (namely, the enable switch of motor E changes "ON" into from "Off", such as rotate car key to light a fire) after, open-close type valve m is closed, compressor pump b is opened, heater circuit switch d is opened, and controllable valve j is closed.Now, the tail gas produced after burning in motor E not via tail gas stream road 100, but is stored in tail gas storage tank 220 via the tail gas heating suction tude 210 of tail gas heating bypass 200, and utilizes heater circuit to heat tail gas wherein.
After the exhaust temperature in tail gas storage tank 220 reaches 300 DEG C, wait for stipulated time T1, to make exhaust temperature in tail gas storage tank 220 higher than 300 DEG C.
When after afore mentioned rules time T1, controllable valve j is made to carry out switch motion.
The switch motion of above-mentioned controllable valve j is undertaken by the relation between the exhaust flow γ at offgas duct B place and the theoretical delivery θ of catalytic effect the best.When the exhaust flow γ < theoretical delivery θ at offgas duct B place, make the aperture of controllable valve j become large gradually, level off to theoretical delivery θ to make the exhaust flow γ forward at the offgas duct B place exhaust flow γ of offgas duct B place (namely increase).During exhaust flow γ >=theoretical delivery θ at offgas duct B place, the aperture of controllable valve j is reduced gradually, oppositely (namely reduce the exhaust flow γ at offgas duct B place) to make the exhaust flow γ at offgas duct B place and level off to theoretical delivery θ.
In startup and the idling stage of motor E, exhaust temperature may, lower than 300 DEG C, by heating tail gas, can make catalyst temperature be promoted to 300 DEG C as early as possible, thus improves catalyzer to the purification efficiency of tail gas.
In the working procedure 2 of tail gas catalyzed system 10, carry out following action:
(1) utilize compressor pump b to be pumped in tail gas storage tank 220 by whole tail gas, a large amount of heat can be produced in the compression process of tail gas, thus tail gas is heated.
(2) by the resistance wire f evolution of heat in heater circuit, the tail gas in tail gas storage tank 220 is heated.
(3) after the exhaust temperature in tail gas storage tank 220 reaches 300 DEG C, by tail gas storage tank 220 by the exhaust emissions that heats to catalyst converter tank 120 place, with the catalyzer in heatable catalytic converter tank 120.
Fig. 5 is the figure of the effect of the heatable catalyst represented in the working procedure 1 of above-mentioned tail gas catalyzed system 10 and working procedure 2.
As shown in Figure 5, in the prior art, in the process that vehicle powers between t1 ~ vehicle launch t2, catalyst temperature in catalyst converter tank 120 is in normal temperature, after vehicle launch t2, just start to heat the catalyzer in catalyst converter tank 120, thus the catalyzer in catalyst converter tank 120 such as just can reach 300 DEG C in the t3 moment.On the contrary, in the present invention, in the process that vehicle powers between t1 ~ vehicle launch t2, utilize the heat effect of the pumping action (compression) of compressor pump b and the resistance wire f of heater circuit, air in tail gas storage tank 220 is raised, after more than 300 DEG C, the catalyzer in catalyst converter tank 120 is heated.
In addition, in the present invention, after the catalyzer shown in catalyst converter tank 120 reaches 300 DEG C, the example that vehicle could start.Like this, in the present invention, such as, in the vehicle launch t2 moment, the catalyzer in catalyst converter tank 120 has reached 300 DEG C, therefore, compared with prior art, can solve the catalyzer technical problem that catalytic capability is extremely weak before an engine is started.
Fig. 6 and Fig. 7 is all the figure represented under motor E normal operation, wherein, Fig. 6 is the schematic diagram of the working procedure 3 (storage compartment tail gas) of the tail gas catalyzed system 10 representing present embodiment, and Fig. 7 is the schematic diagram of the working procedure 4 (tail gas that discharge unit stores) of the tail gas catalyzed system representing embodiment of the present invention.
In Fig. 6, Fig. 7, when normal working of engine, open-close type valve m is in open mode.
As shown in Figure 6, during exhaust flow β≤theoretical delivery θ at offgas duct A place, the catalytic effect being judged as the catalyzer in catalyst converter tank 120 preferably or catalytic capability still have more than needed, namely there is not the situation of catalytic capability deficiency.
As the exhaust flow β > theoretical delivery θ at offgas duct A place, be judged as that the catalytic capability of the catalyzer in catalyst converter tank 120 is not enough.This be due to enter tail gas in catalyst converter tank 120 too much caused by.Now, controllable valve j is closed, and compressor pump b is opened, be stored in tail gas storage tank 220 to extract tail gas from offgas duct 110.
In addition, the switch motion of the exhaust capacity of above-mentioned compressor pump b is undertaken by the relation between the exhaust flow γ at offgas duct B place and the theoretical delivery θ of catalytic effect the best.When the exhaust flow γ > theoretical delivery θ at offgas duct B place, increase the exhaust capacity of compressor pump b, with make the exhaust flow γ at offgas duct B place oppositely (i.e. the exhaust flow γ at reduction offgas duct B place) level off to theoretical delivery θ.When the exhaust flow γ < theoretical delivery θ at offgas duct B place, reduce the exhaust capacity of compressor pump b, level off to theoretical delivery θ to make the exhaust flow γ forward at offgas duct B place (i.e. the exhaust flow γ at increase offgas duct B place).
In the working procedure 3 of tail gas catalyzed system 10, as the exhaust flow β > theoretical delivery θ at offgas duct A place, appropriate tail gas is stored in tail gas storage tank 220, makes the exhaust flow of inflow catalyst converter tank 120 constant in θ g/min.Now, following action is carried out:
(1) partial tail gas is pumped in tail gas storage tank 220 by compressor pump b, and all the other tail gas are expelled in air after the catalyst process of catalyst converter tank 120.
(2) ECU exports the working state controlling variable capacity compressor pump b by dutycycle.In addition, ECU, by the difference of the theoretical delivery θ of the exhaust flow γ and catalytic effect the best that compare offgas duct B place, feeds back the working state of compressor pump.
As shown in Figure 7, when the exhaust flow β > theoretical delivery θ at offgas duct A place, be judged as that the catalytic capability of the catalyzer in catalyst converter tank 120 is not enough, now, compressor pump b is in open mode.
When exhaust flow β < (or≤) the theoretical delivery θ at offgas duct A place, be judged as that the catalytic capability of the catalyzer in catalyst converter tank 120 still has more than needed.This is caused by the tail gas deficiency owing to entering in catalyst converter tank 120.Now, controllable valve j is opened, and compressor pump b is closed, discharge via from heating tail gas discharging pipe 230 with the tail gas that will be stored in tail gas storage tank 220.
The switch motion of above-mentioned controllable valve j is undertaken by the relation between the exhaust flow γ at offgas duct B place and the theoretical delivery θ of catalytic effect the best.When the exhaust flow γ < theoretical delivery θ at offgas duct B place, make the aperture of controllable valve j become large gradually, level off to theoretical delivery θ to make the exhaust flow γ forward at the offgas duct B place exhaust flow γ of offgas duct B place (namely increase).During exhaust flow γ >=theoretical delivery θ at offgas duct B place, the aperture of controllable valve j is reduced gradually, oppositely (namely reduce the exhaust flow γ at offgas duct B place) to make the exhaust flow γ at offgas duct B place and level off to theoretical delivery θ.
In the working procedure 4 of tail gas catalyzed system 10, as the exhaust flow β < theoretical delivery θ at offgas duct A place, tail gas storage tank 220 discharges appropriate tail gas to catalyst converter tank 120 place, makes the exhaust flow of inflow catalyst converter tank 120 constant in θ g/min.Now, following action is carried out:
(1) opened by controllable valve j, the exhaust emissions after compression in tail gas storage tank 220 being stored is to catalyst converter tank 120 place.
(2) ECU exports the working state controlling controllable valve j by dutycycle.In addition, ECU, by the difference of the theoretical delivery θ of the exhaust flow γ and catalytic effect the best that compare offgas duct B place, feeds back the working state of compressor pump.
Fig. 8 is that the system represented in the working procedure 3 of above-mentioned tail gas catalyzed system 10 and working procedure 4 stores, the effect of emission.
In the prior art, in the running process of vehicle, there is high-speed region and low-speed region in the rotating speed of motor, when low-speed region, because tail gas amount is few, therefore, tail gas amount in catalyst converter tank 120 is few, and make the catalytic capability of catalyzer wherein superfluous, on the contrary, when high-speed region, because tail gas amount is many, therefore, the tail gas amount in catalyst converter tank 120 is many, and makes the catalytic capability of catalyzer wherein not enough.By this, in the tail gas catalyzed system of prior art, the catalytic capability of the catalyzer in catalyst converter tank 120 switches all the time between catalytic capability is not enough and catalytic capability is superfluous, cause the waste of the catalytic capability when tail gas amount is few, cannot be processed fully at tail gas amount tail gas of many times simultaneously, and then be caused pollution of atmosphere.
In the present invention, by when tail gas amount is too much, partial tail gas compression is stored in tail gas storage tank 220, when tail gas amount is less, suitably the tail gas in tail gas storage tank 220 is discharged, by this, in the full rotary speed area of motor, all fully can effectively utilize catalyst ability.
Below, with reference to Fig. 9, tail gas catalyzed controlling method of the present invention is described in detail.
Fig. 9 is the control flow chart of the tail gas catalyzed system of embodiment of the present invention.
As shown in Figure 9, vehicle power on (that is, rotate car key, motor is energized) afterwards (step S100), compressor pump b is worked, close heater circuit switch d, controllable valve j, open open-close type valve m, and make enable switch lose efficacy (step S200).
Then, judge whether the air temperature in the tail gas storage tank 220 that detected by temperature transducer i reaches the activation temperature (such as 300 DEG C) (step S310) of catalyzer.
When being judged as activation temperature (being judged as "No" in step S310) not yet reaching catalyzer, return step S200.
After being judged as that the air temperature in tail gas storage tank 220 reaches the activation temperature (being judged as "Yes" in step S310) of catalyzer, stopping compressor pump b, and heater circuit switch d, controllable valve j are opened (step S320).Then, make enable switch effectively (step S330).
Then, whether motor E is started judge (step S400).
If motor E not yet starts (being judged as "No" in step S400), then return step S200.
If motor E starts (being judged as "Yes" in step S400), then make compressor pump b work, and heater circuit switch d, controllable valve j and open-close type valve m are closed (step S510).
Then, judge whether the exhaust temperature in the tail gas storage tank 220 that detected by temperature transducer i reaches the activation temperature (such as 300 DEG C) (step S520) of catalyzer.
When being judged as activation temperature (being judged as "No" in step S520) not yet reaching catalyzer, return step S510.
After being judged as that the air temperature in tail gas storage tank 220 reaches the activation temperature (being judged as "Yes" in step S520) of catalyzer, after the T1 time, controllable valve j is opened (step S530) with initial angle.
Then, the relation between the exhaust flow γ at offgas duct B place and theoretical delivery θ is judged (step S540).
When being judged as exhaust flow γ≤theoretical delivery θ (being namely judged as "No" in step S540) at offgas duct B place, increase the aperture (step S541) of controllable valve j.
When being judged as exhaust flow γ > theoretical delivery θ (being namely judged as "Yes" in step S540) at offgas duct B place, reduce the aperture (step S542) of controllable valve j.
Then, whether be in idling to motor E to judge (step S600).
When being judged as that motor is in idling mode (being namely judged as "Yes" in step S600), return step S510.
When being judged as that motor is in non-idle (being namely judged as "No" in step S600), controllable valve m is opened (step S710).
Then, the relation between the exhaust flow β at offgas duct A place and theoretical delivery θ is judged (step S720).
When exhaust flow β > theoretical delivery θ (being namely judged as "Yes" in step S720) at offgas duct A place, make compressor pump b with initial flow action, and heater circuit switch d is opened, controllable valve j is closed (step S721A).
Then, the relation between the exhaust flow γ at offgas duct B place and theoretical delivery θ is judged (step S730A).
When being judged as exhaust flow γ≤theoretical delivery θ (being namely judged as "No" in step S730A) at offgas duct B place, reduce the compressed capability of bleeding (step S731A) of compressor pump b.
When being judged as exhaust flow γ > theoretical delivery θ (being namely judged as "Yes" in step S730A) at offgas duct B place, increase the compressed capability of bleeding (step S732A) of compressor pump b.
Then, the limit pressure P (step S740A) whether force value M that pressure transducer g records exceedes tail gas storage tank 220 and carry is judged.
When the force value M that pressure transducer g records exceedes limit pressure P (being judged as "Yes" in step S740A) of tail gas storage tank 220 carrying; open safety relief valve c (step S741A), the shutdown then carrying out vehicle judges (step S750).
When the force value M that pressure transducer g records does not exceed limit pressure P (being judged as "No" in step S740A) of tail gas storage tank 220 carrying, the shutdown directly carrying out vehicle judges (step S750).
If be judged as that not being in vehicle shuts down (that is, vehicle is not in switch-off) state (being judged as "No" in step S750), then return step S720.
Otherwise, if vehicle is in switch-off state (being judged as "Yes" in step S750), then terminate whole control flow.
On the other hand, during exhaust flow β≤theoretical delivery θ (being namely judged as "No" in step S720) at offgas duct A place, compressor pump b is quit work (step S721B), then makes controllable valve j open (step S722B) with initial angle.
Then, the relation between the exhaust flow γ at offgas duct B place and theoretical delivery θ is judged (step S730B).
When being judged as exhaust flow γ≤theoretical delivery θ (being namely judged as "No" in step S730B) at offgas duct B place, increase the aperture (step S731B) of controllable valve j.
When being judged as exhaust flow γ > theoretical delivery θ (being namely judged as "Yes" in step S730B) at offgas duct B place, reduce the aperture (step S732B) of controllable valve j.
Then, the shutdown carrying out vehicle judges (step S750).
Above by reference to the accompanying drawings to invention has been exemplary description, obvious specific implementation of the present invention is not by the restriction of above-mentioned mode of execution.Those of ordinary skill in the art are easy to advantage and the amendment of expecting other.Therefore, in it is more wide in range, shown in the present invention is not limited to here and described detail and representative embodiment.Therefore, can not depart from as appended claims and equivalent thereof make various amendment under the prerequisite of the spirit or scope of this general inventive concept that limits.
Such as, in the above-described embodiment, show the situation that heater circuit comprises heater circuit switch d, metal-oxide-semiconductor current amplifier e, resistance wire f, but the present invention is not limited to this, as long as heater circuit can heat the air/tail gas in tail gas storage tank, then the structure of heater circuit is not by the restriction of embodiment of the present invention.
Such as, in the above-described embodiment, show after the exhaust temperature in tail gas storage tank 220 reaches 300 DEG C, wait for stipulated time T1, and after afore mentioned rules time T1, make controllable valve j carry out switch motion, but the present invention is not limited to this, also can not wait for stipulated time T1, and make controllable valve j carry out switch motion.
Claims (10)
1. a tail gas catalyzed system (10), is characterized in that, comprising:
Tail gas stream (100), offgas duct (110), catalyst converter tank (120) and tail gas discharging pipe (130) is provided with in this tail gas stream (100), wherein, one end of above-mentioned offgas duct (110) is connected with the exhaust port of motor (E), the other end of above-mentioned offgas duct (110) is connected with one end of described catalyst converter tank (120), in described catalyst converter tank (120), store catalyzer, the tail gas after the catalyst in catalyst converter tank (120) is discharged by described tail gas discharging pipe (130); And
Tail gas heating bypass (200), tail gas heating suction tude (210) is provided with in this tail gas heating bypass (200), tail gas storage tank (220) and heating exhaust pipe (230), wherein, one end of described tail gas heating suction tude (210) and the described offgas duct (110) of described tail gas stream (100), part by the exhaust port side of described motor (E) connects, the other end of described tail gas heating suction tude (210) is connected with described tail gas storage tank (220), one end of described heating exhaust pipe (230) is connected with described tail gas storage tank (220), the other end of described heating exhaust pipe (230) and the offgas duct (110) of described tail gas stream (100), part by described catalyst converter tank (120) side connects,
In described tail gas heating bypass (200), the midway of described tail gas heating suction tude (210) is provided with the first unidirectional stop valve (a),
Described tail gas heating suction tude (210), than the position of attachment portion of described first unidirectional stop valve (a) more by being connected with described tail gas storage tank (220), be provided with compressor pump (b),
Controllable valve (f) is provided with in described tail gas storage tank (220).
2. tail gas catalyzed system (10) as claimed in claim 1, is characterized in that,
Heater circuit is provided with in the described tail gas storage tank (220) of described tail gas heating bypass (200).
3. tail gas catalyzed system (10) as claimed in claim 2, is characterized in that,
Described heater circuit comprises heater circuit switch (d), metal-oxide-semiconductor current amplifier (e) and resistance wire (f).
4. tail gas catalyzed system (10) as claimed in claim 1, is characterized in that,
In tail gas stream (100), than the attachment portion be connected with the described tail gas heating suction tude (210) of described tail gas heating bypass (200) slightly by the position in downstream, be provided with open-close type valve (m).
5. tail gas catalyzed system (10) as claimed in claim 1 or 2, is characterized in that,
Machine security Decompression valves (c), pressure transducer (g) and temperature transducer (i) is also provided with in described tail gas storage tank (220),
The midway of described heating exhaust pipe (230) is provided with the second unidirectional stop valve (k).
6. a tail gas catalyzed controlling method, uses tail gas catalyzed system (10) catalysis to tail gas described in claim 5 to control, it is characterized in that,
Before described motor (E) powers on and not yet starts, utilize the compression of described compressor pump (b) or utilize the heat effect of the compression of described compressor pump (b) and described heater circuit, the air be stored in described tail gas storage tank (220) is heated
During the activation temperature of the air temperature in described tail gas storage tank (220) higher than described catalyzer, the air of described tail gas storage tank (220) is introduced described catalyst converter tank (120) and the catalyzer in described catalyst converter tank (120) is heated.
7. tail gas catalyzed controlling method as claimed in claim 6, is characterized in that,
When described motor (E) startup, idling, described open-close type valve (m) is closed,
Utilize the compression of described compressor pump (b) or utilize the heat effect of the compression of described compressor pump (b) and described heater circuit, the tail gas be stored in described tail gas storage tank (220) is heated,
After exhaust temperature in described tail gas storage tank (220) reaches 300 DEG C, wait for the stipulated time (T1), after the described stipulated time (T1), make described controllable valve (j) carry out switch motion,
The switch motion of described controllable valve (j) by the primary importance (B) of described offgas duct, be namely positioned at described tail gas stream (100), more undertaken by the relation between the exhaust flow (γ) of position in exhaust gas flow downstream side and the theoretical delivery (θ) of catalytic effect the best than the attachment portion be connected with the described heating exhaust pipe (230) of described tail gas heating bypass (200)
When the exhaust flow (γ) of the primary importance (B) of described offgas duct is less than described theoretical delivery (θ), increase the aperture of described controllable valve (j) gradually,
Time more than the exhaust flow (γ) of the primary importance (B) of described offgas duct is for described theoretical delivery (θ), reduce the aperture of described controllable valve (j) gradually.
8. tail gas catalyzed controlling method as claimed in claim 6, is characterized in that,
When motor (E) is in normal operation, described open-close type valve (m) is opened,
The second place (A) in described offgas duct (110), be namely positioned at described tail gas stream (100), when being more greater than described theoretical delivery (θ) by the exhaust flow (β) of position of exhaust gas flow upstream side than the attachment portion be connected with the described tail gas heating suction tude (210) of described tail gas heating bypass (200), be judged as that the catalytic capability of the catalyzer of described catalyst converter tank (120) is not enough
When the exhaust flow (β) of the second place (A) of described offgas duct (110) is less than described theoretical delivery (θ), be judged as that the catalytic capability of the catalyzer of described catalyst converter tank (120) is superfluous.
9. tail gas catalyzed controlling method as claimed in claim 8, is characterized in that,
When described catalytic capability is not enough,
By the relation between the exhaust flow (γ) of the primary importance (B) of described offgas duct (110) and described theoretical delivery (θ), control the exhaust capacity of described compressor pump (b),
When the exhaust flow (γ) of the primary importance (B) of described offgas duct (110) is greater than described theoretical delivery (θ), increase the exhaust capacity of described compressor pump (b),
The exhaust flow (γ) of the primary importance (B) in described offgas duct (110) for described theoretical delivery (θ) below time, reduce the exhaust capacity of described compressor pump (b),
When described catalytic capability is superfluous,
By the relation between the exhaust flow (γ) of the primary importance (B) of described offgas duct (110) and described theoretical delivery (θ), control the aperture of described controllable valve (j),
When the exhaust flow (γ) of the primary importance (B) of described offgas duct is less than described theoretical delivery (θ), increase the aperture of described controllable valve (j) gradually,
Time more than the exhaust flow (γ) of the primary importance (B) of described offgas duct is for described theoretical delivery (θ), reduce the aperture of described controllable valve (j) gradually.
10. the tail gas catalyzed controlling method according to any one of claim 6 to 9, is characterized in that,
When the force value (M) that the pressure transducer (g) being located at described tail gas storage tank (220) detects is greater than utmost carrying ability force value (P) of described tail gas storage tank (220), open described safety relief valve (c).
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