CN105443217B - A kind of method and device for detecting ternary catalyzing unit and blocking - Google Patents
A kind of method and device for detecting ternary catalyzing unit and blocking Download PDFInfo
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- CN105443217B CN105443217B CN201510956617.5A CN201510956617A CN105443217B CN 105443217 B CN105443217 B CN 105443217B CN 201510956617 A CN201510956617 A CN 201510956617A CN 105443217 B CN105443217 B CN 105443217B
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 23
- 239000003054 catalyst Substances 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 239000002912 waste gas Substances 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 230000032683 aging Effects 0.000 abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910002089 NOx Inorganic materials 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000001473 noxious effect Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000000505 pernicious effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1406—Exhaust gas pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of method for detecting ternary catalyzing unit and blocking, including：When the exhaust gas flow in blast pipe is more than zero, according to exhaust air mass flow, ternary catalyzing unit head temperature and ternary catalyzing unit forefront pressure, the pressure difference of ternary catalyzing unit rear and front end is calculated；When the pressure difference is more than preset times more than threshold pressure differential and the pressure difference more than the number of threshold pressure differential, then testing result is that ternary catalyzing unit blocks；Otherwise end pressure and the pressure difference sum after setting ternary catalyzing unit forefront pressure as current ternary catalyzing unit, and judge whether the exhaust gas flow in blast pipe is more than zero.Pressure difference of the invention by calculating ternary catalyzing unit rear and front end, so as to judge whether ternary catalyzing unit blocks, it is blocking or aging effectively to distinguish ternary catalyzing unit, avoids the potential safety hazard of engine.
Description
Technical field
The present invention relates to ternary catalyzing unit detection field, and in particular to a kind of to detect method and the dress that ternary catalyzing unit blocks
Put.
Background technology
Ternary catalyzing unit is mounted in most important outer purifier in automobile exhaust system, and it can arrange vehicle exhaust
The pernicious gases such as CO, HC and the NOx gone out are changed into harmless carbon dioxide, water and nitrogen by oxidation and reduction.Wherein,
CO represents one of carbon monoxide, the main noxious emission of gas engine；NOx is the general designation of nitric oxide and nitrogen dioxide, combustion
One of main noxious emission of gas engine, Abgasgesetz strictly controls；HC represent hydrocarbon, gas engine it is main
One of noxious emission.Lambda sensor is the standard configuration on automobile, and it is to utilize Ceramic sensible devices measurement automobile exhaust
Oxygen voltage in pipeline, corresponding oxygen concentration is calculated by chemical equilibrium theory, reaches monitoring and control air-fuel ratio, to protect
Demonstrate,prove product quality and exhaust emissions measuring cell up to standard.
Existing frequently-used detection method is judged by the oxygen sensor voltage waveform of upstream and downstream, due to three-element catalytic
Utensil has oxygen storage capacity, and when ternary catalyzing unit is blocked, oxygen storage capacity declines, and upstream and downstream oxygen sensor voltage waveform levels off to
It is identical, now need service station to carry out related test, it is blocking or aging to judge ternary catalyzing unit.
The operation principle of ternary catalyzing unit is：When the vehicle exhaust of high temperature passes through purifier, in ternary catalyzing unit
Cleanser will strengthen the activity of tri- kinds of gas of CO, HC and NOx, promote it to carry out certain oxidationreduction chemical reaction, wherein CO
Colourless, nontoxic carbon dioxide is oxidized at high temperature；HC compounds are oxidized to water and carbon dioxide at high temperature；
NOx is reduced into nitrogen and oxygen.Three kinds of pernicious gases become innocuous gas, vehicle exhaust is purified.
But when automobile long-term work is in low-temperature condition, ternary catalyzing unit can not start, the soot of engine discharge can be attached
On the surface of catalyst, cause not contacting with CO and HC, get off for a long time, just make the pore plugging of carrier；Simultaneously from
The phosphorus and zinc of lubricating oil form the surface that oxide particle is easily attracted to catalyst after burning within the engine, will also result in three
The blocking of first catalyst converter.Ternary catalyzing unit, which blocks, to cause oil consumption to raise, and power dropping can even influence the safety of engine, institute
To be necessary to diagnose to whether ternary catalyzing unit blocks.
The content of the invention
Due to there is currently can not online real-time judge ternary catalyzing unit be blocking or aging, it is necessary to go service station by
The problem of diagnostic equipment is judged, the present invention propose a kind of method and device for detecting ternary catalyzing unit and blocking.
In a first aspect, the present invention proposes a kind of method for detecting ternary catalyzing unit and blocking, including：
When the exhaust gas flow in blast pipe is more than zero, according to exhaust air mass flow, ternary catalyzing unit head temperature and three
First catalyst converter forefront pressure, the pressure difference of ternary catalyzing unit rear and front end is calculated；
It is more than preset times when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential, then detects
As a result blocked for ternary catalyzing unit；Otherwise end pressure and described after setting ternary catalyzing unit forefront pressure as current ternary catalyzing unit
Pressure difference sum, and judge whether the exhaust gas flow in blast pipe is more than zero；
Wherein, end pressure is equal to current atmospheric pressure after ternary catalyzing unit；The ternary catalyzing unit is close to exhaust outlet end
It is front end away from exhaust outlet end for rear end.
Preferably, it is described according to exhaust air mass flow, ternary catalyzing unit head temperature and ternary catalyzing unit forefront pressure, bag
Include：
According to the air inflow of air inlet pipe and the jet amount of engine, the exhaust air mass flow is calculated.
Preferably, it is described when the pressure difference is more than threshold pressure differential, including：
The threshold pressure differential is set according to engine speed and charge.
Preferably, it is described when the pressure difference is more than threshold pressure differential and the pressure difference is more than the number of threshold pressure differential more than default
Number, then testing result is ternary catalyzing unit blocking, including：
It is more than preset times when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential, then prompts
DTC, and judge that testing result blocks for ternary catalyzing unit according to the DTC.
Preferably, it is described according to exhaust air mass flow, ternary catalyzing unit head temperature and ternary catalyzing unit forefront pressure, meter
Calculation obtains the pressure difference of ternary catalyzing unit rear and front end, including：
The pressure differential deltap P of ternary catalyzing unit rear and front end is：
Wherein, L is the length of ternary catalyzing unit, and D is the interior diameter of ternary catalyzing unit, and M is waste gas molal weight, T1For three
First catalyst converter head temperature, m are exhaust air mass flow, P1For ternary catalyzing unit forefront pressure；K、R、B、T0And μ0It is constant,
L, D obtains according to measurement result.
Preferably, the assumed condition of formula (1) includes：Exhaust gas velocity in blast pipe is constant, and exhaust gas flow is constant.
Preferably, the assumed condition of formula (1) includes：Waste gas flows no pressure loss in blast pipe, only in ternary
There is the pressure loss at catalyst.
Preferably, the assumed condition of formula (1) includes：Density of the waste gas in ternary catalyzing unit and temperature with blast pipe
The density and temperature of upstream portion are identical；Wherein, blast pipe upstream portion refers to the outlet pipe portion within ternary catalyzing unit.
Second aspect, the present invention also propose a kind of device for detecting ternary catalyzing unit and blocking, it is characterised in that including：Row
Tracheae, ternary catalyzing unit and temperature sensor；
The ternary catalyzing unit is at the pre-determined distance of exhaust outlet；
The temperature sensor is urged on the blast pipe and close to the ternary catalyzing unit front end for measuring ternary
Change device head temperature；
Wherein, the ternary catalyzing unit is rear end close to exhaust outlet end, is front end away from exhaust outlet end.
Preferably, in addition to lambda sensor；
The lambda sensor is used to measure the oxygen voltage in blast pipe, and corresponding oxygen concentration is calculated；
The lambda sensor is two, and the first lambda sensor is located on blast pipe and close ternary catalyzing unit front end, second
Lambda sensor is located on blast pipe and close to ternary catalyzing unit rear end；For being sentenced according to the voltage waveform of described two lambda sensors
Whether disconnected ternary catalyzing unit blocks.
As shown from the above technical solution, the pressure difference of the invention by calculating ternary catalyzing unit rear and front end, so as to judge three
Whether first catalyst converter blocks, and it is blocking or aging effectively to distinguish ternary catalyzing unit, avoids the potential safety hazard of engine.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these figures.
Fig. 1 is the schematic flow sheet for the method that a kind of detection ternary catalyzing unit that one embodiment of the invention provides blocks；
Fig. 2 is the structural representation for the device that a kind of detection ternary catalyzing unit that one embodiment of the invention provides blocks.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of invention is further described.Following examples are only used for more clear
Illustrate to Chu technical scheme, and can not be limited the scope of the invention with this.
Fig. 1 shows the schematic flow sheet for the method that a kind of detection ternary catalyzing unit that the present embodiment provides blocks, including：
S1, when the exhaust gas flow in blast pipe be more than zero when, according to exhaust air mass flow, ternary catalyzing unit head temperature and
Ternary catalyzing unit forefront pressure, the pressure difference of ternary catalyzing unit rear and front end is calculated；
S2, when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential it is more than preset times, then
Testing result blocks for ternary catalyzing unit；Otherwise after setting ternary catalyzing unit forefront pressure as current ternary catalyzing unit end pressure and
The pressure difference sum, and judge whether the exhaust gas flow in blast pipe is more than zero；
Wherein, end pressure is equal to current atmospheric pressure after ternary catalyzing unit；The ternary catalyzing unit is close to exhaust outlet end
It is front end away from exhaust outlet end for rear end.
The present embodiment is by calculating the pressure difference of ternary catalyzing unit rear and front end, so as to judge whether ternary catalyzing unit blocks,
It is blocking or aging effectively to distinguish ternary catalyzing unit, avoids the potential safety hazard of engine.
It is described according to exhaust air mass flow, ternary catalyzing unit head temperature and ternary as the preferred scheme of the present embodiment
Catalyst converter forefront pressure, including：
According to the air inflow of air inlet pipe and the jet amount of engine, the exhaust air mass flow is calculated.
By the way that the air inflow of air inlet pipe is added with the jet amount of engine, exhaust mass stream can be easily obtained
Amount.Wherein, the air inflow of air inlet pipe can be by intake flow sensor acquisition or acquisition of tabling look-up, and the jet amount of engine, which can table look-up, to be obtained
.
Further, it is described when the pressure difference is more than threshold pressure differential, including：
The threshold pressure differential is set according to engine speed and charge.
Engine speed is obtained by speed probe, and charge can table look-up acquisition.
Further, it is described when the pressure difference is more than threshold pressure differential and the pressure difference is more than more than the number of threshold pressure differential
Preset times, then testing result is ternary catalyzing unit blocking, including：
It is more than preset times when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential, then prompts
DTC, and judge that testing result blocks for ternary catalyzing unit according to the DTC.
By prompting DTC, user can be easy to be apparent from the failure situation of ternary catalyzing unit.
Specifically, it is described according to exhaust air mass flow, ternary catalyzing unit head temperature and ternary catalyzing unit forefront pressure, meter
Calculation obtains the pressure difference of ternary catalyzing unit rear and front end, including：
The pressure differential deltap P of ternary catalyzing unit rear and front end is：
Wherein, L is the length of ternary catalyzing unit, and D is the interior diameter of ternary catalyzing unit, and M is waste gas molal weight, T1For three
First catalyst converter head temperature, m are exhaust air mass flow, P1For ternary catalyzing unit forefront pressure；K、R、B、T0And μ0It is constant,
L, D obtains according to measurement result, and M obtains according to tabling look-up.
Further, the assumed condition of formula (1) includes：Exhaust gas velocity in blast pipe is constant, and exhaust gas flow is constant.
Further, the assumed condition of formula (1) includes：Waste gas flows no pressure loss in blast pipe, only exists
There is the pressure loss at three-way catalyst.
Further, the assumed condition of formula (1) includes：Density and temperature of the waste gas in ternary catalyzing unit are with arranging
The density and temperature of tracheae upstream portion are identical；Wherein, blast pipe upstream portion refers to the exhaust pipe portion within ternary catalyzing unit
Point.
By setting the assumed condition of formula (1), the pressure difference of more accurate ternary catalyzing unit rear and front end can be obtained
Result of calculation.
Based on above-mentioned assumed condition, the pressure drop in ternary catalyzing unit is mainly friction drop, as ternary catalyzing unit
The pressure differential deltap P of rear and front end, it is represented by equation below (2)：
Wherein, L is the length of ternary catalyzing unit, and D is the interior diameter of ternary catalyzing unit, and ρ is fluid density, and u puts down for fluid
Equal speed, λ are coefficient of friction；L, D obtains according to measurement result, and ρ obtains according to mass balances equation, such as formula (3)；According to gas
Body flow Q=ρ Su understand that fluid average speed u is calculated according to formula (4)；λ repaiies this (Blasius) formula according to para
It is calculated, such as formula (5)；
In formula (3), P1For ternary catalyzing unit forefront pressure, M is waste gas molal weight, and R is proportionality constant, T1For ternary
Catalyst converter head temperature；M obtains according to tabling look-up；
In formula (4), V is exhaust gas volume flow, and S is the sectional area of ternary catalyzing unit；V calculates according to mass balances equation
Obtain, such as formula (6)；
In formula (5), ReFor Reynolds number, it is calculated according to formula (7)；
In formula (6), K is constant, and m is exhaust air mass flow；
In formula (7), μ is fluid viscosity coefficient, is calculated according to Sutherland formula (8)；
In formula (8), B, T0And μ0It is constant；For waste gas, B=110.4K, T0=288.15K, μ0=1.7932
×10-5Pa·s。
Formula (3)-(8) are brought into formula (2) and can obtain formula (1), it follows that according to exhaust air mass flow,
Ternary catalyzing unit head temperature and ternary catalyzing unit forefront pressure, you can obtain the pressure difference of ternary catalyzing unit rear and front end, still
Because current execution cycle upstream pressure is unknowable, therefore the upstream pressure that can use an execution cycle is calculated, therefore
The real-time pressure difference at ternary catalyzing unit both ends can be calculated with the method for iteration.
When engine is not actuated, ternary catalyzing unit forefront pressure and rear end pressure are equal to atmospheric pressure P0, it is useless when detecting
When gas mass flow is more than zero, the pressure differential deltap P of ternary catalyzing unit rear and front end is calculated using formula (1), and used in formula (1)
To the initial forefront pressure of ternary catalyzing unit be atmospheric pressure P0, temperature is the actual temperature T measured of temperature sensor1, now
Judge whether pressure difference is more than certain threshold value (tabled look-up and tried to achieve by rotating speed and charge), if being not greater than threshold value or pressure difference more than threshold value
Number is not up to preset times, then (is atmospheric pressure P with end pressure after ternary catalyzing unit0) obtained plus the pressure difference calculated
Ternary catalyzing unit forefront pressure, this pressure are used for the pressure difference of next execution computation of Period ternary catalyzing unit rear and front end, until
The pressure difference of calculating is more than threshold value and circulation reaches certain number, then the DTC for reporting ternary catalyzing unit to block
(Diagnostic Fault Check Handing, DFC).
The present embodiment calculates the pressure difference at ternary catalyzing unit both ends using pressure drop formula and alternative manner, can not only be
Whether line real-time judge ternary catalyzing unit blocks, and when chocking-up degree reaches certain value, goes to service station to urge ternary in time
Change device to be cleared up, can effectively extend the service life of ternary catalyzing unit, and can guarantee that the safety of engine.And the present embodiment is adopted
It is less with formula computational methods, scalar quantity.
Fig. 2 shows the structural representation for the device that a kind of detection ternary catalyzing unit that the present embodiment provides blocks, including：
Blast pipe 1, ternary catalyzing unit 2 and temperature sensor 3；
The ternary catalyzing unit 2 is at the pre-determined distance that blast pipe 1 exports；
The temperature sensor 3 is on the blast pipe 1 and close to the front end of ternary catalyzing unit 2, for measuring three
First head temperature of catalyst converter 2；
Wherein, the ternary catalyzing unit 2 is rear end close to the port of export of blast pipe 1, is front end away from the port of export of blast pipe 1.
The present embodiment is by temperature sensor measurement Tail Pipe Temperature, to calculate the pressure difference of ternary catalyzing unit rear and front end,
So as to judge whether ternary catalyzing unit blocks, it is blocking or aging effectively to distinguish ternary catalyzing unit, avoids the peace of engine
Full hidden danger.
As the preferred scheme of the present embodiment, in addition to lambda sensor 4；
The lambda sensor 4 is used to measure the oxygen voltage in blast pipe 1, and corresponding oxygen concentration is calculated；
The lambda sensor is two, and the first lambda sensor is located on blast pipe and close ternary catalyzing unit front end, second
Lambda sensor is located on blast pipe and close to ternary catalyzing unit rear end；For being sentenced according to the voltage waveform of described two lambda sensors
Whether disconnected ternary catalyzing unit blocks.
The test of correlation can be carried out using two lambda sensors, so as to judge that ternary catalyzing unit is blocking or aging,
And cleaning is taken according to judged result or changes the measure of ternary catalyzing unit.
In the specification of the present invention, numerous specific details are set forth.It is to be appreciated, however, that embodiments of the invention can be with
Put into practice in the case of these no details.In some instances, known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this description.
Claims (10)
- A kind of 1. method for detecting ternary catalyzing unit and blocking, it is characterised in that including：When the exhaust gas flow in blast pipe is more than zero, urged according to exhaust air mass flow, ternary catalyzing unit head temperature and ternary Change device forefront pressure, the pressure difference of ternary catalyzing unit rear and front end is calculated；It is more than preset times when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential, then testing result Blocked for ternary catalyzing unit；Otherwise end pressure and the pressure difference after setting ternary catalyzing unit forefront pressure as current ternary catalyzing unit Sum, and judge whether the exhaust gas flow in blast pipe is more than zero；Wherein, end pressure is equal to current atmospheric pressure after ternary catalyzing unit；After the ternary catalyzing unit is close to exhaust outlet end End, it is front end away from exhaust outlet end.
- 2. according to the method for claim 1, it is characterised in that described according to exhaust air mass flow, ternary catalyzing unit front end Temperature and ternary catalyzing unit forefront pressure, including：According to the air inflow of air inlet pipe and the jet amount of engine, the exhaust air mass flow is calculated.
- 3. according to the method for claim 2, it is characterised in that it is described when the pressure difference is more than threshold pressure differential, including：The threshold pressure differential is set according to engine speed and charge.
- 4. according to the method for claim 3, it is characterised in that described when the pressure difference is more than threshold pressure differential and the pressure difference Number more than threshold pressure differential is more than preset times, then testing result blocks for ternary catalyzing unit, including：It is more than preset times when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential, then prompts failure Diagnostic code, and judge that testing result blocks for ternary catalyzing unit according to the DTC.
- 5. according to the method for claim 4, it is characterised in that described according to exhaust air mass flow, ternary catalyzing unit front end Temperature and ternary catalyzing unit forefront pressure, the pressure difference of ternary catalyzing unit rear and front end is calculated, including：The pressure differential deltap P of ternary catalyzing unit rear and front end is：<mrow> <mi>&Delta;</mi> <mi>P</mi> <mo>=</mo> <mfrac> <mrow> <mn>2.5312</mn> <msub> <mi>LMT</mi> <mn>1</mn> </msub> <msup> <mi>K</mi> <mn>2</mn> </msup> <msup> <mi>m</mi> <mn>2</mn> </msup> </mrow> <mrow> <msup> <mi>&pi;</mi> <mn>2</mn> </msup> <msub> <mi>RP</mi> <mn>1</mn> </msub> <msup> <mi>D</mi> <mn>5</mn> </msup> </mrow> </mfrac> <mroot> <mfrac> <mrow> <msub> <mi>&pi;RD&mu;</mi> <mn>0</mn> </msub> <msup> <msub> <mi>T</mi> <mn>1</mn> </msub> <mn>1.5</mn> </msup> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mn>0</mn> </msub> <mo>+</mo> <mi>B</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mn>4</mn> <msup> <msub> <mi>KmMT</mi> <mn>0</mn> </msub> <mn>1.5</mn> </msup> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mn>1</mn> </msub> <mo>+</mo> <mi>B</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mn>4</mn> </mroot> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>Wherein, L is the length of ternary catalyzing unit, and D is the interior diameter of ternary catalyzing unit, and M is waste gas molal weight, T1Urged for ternary Change device head temperature, m is exhaust air mass flow, P1For ternary catalyzing unit forefront pressure；K、R、B、T0And μ0It is constant, L, D root Obtained according to measurement result.
- 6. according to the method for claim 5, it is characterised in that the assumed condition of formula (1) includes：Waste gas in blast pipe Speed is constant, and exhaust gas flow is constant.
- 7. according to the method for claim 6, it is characterised in that the assumed condition of formula (1) includes：Waste gas is in blast pipe No pressure loss is flowed, only there is the pressure loss at three-way catalyst.
- 8. according to the method for claim 7, it is characterised in that the assumed condition of formula (1) includes：Waste gas is in three-element catalytic Density and temperature in device is identical with the density and temperature in blast pipe upstream portion；Wherein, blast pipe upstream portion refers to three Outlet pipe portion within first catalyst converter.
- A kind of 9. device for detecting ternary catalyzing unit and blocking, it is characterised in that including：Blast pipe, ternary catalyzing unit and temperature pass Sensor；The ternary catalyzing unit is at the pre-determined distance of exhaust outlet；The temperature sensor is on the blast pipe and close to the ternary catalyzing unit front end, for measuring ternary catalyzing unit Head temperature；Wherein, when the exhaust gas flow in the blast pipe is more than zero, according to exhaust air mass flow, the ternary catalyzing unit front end Temperature and the ternary catalyzing unit forefront pressure, the pressure difference of the ternary catalyzing unit rear and front end is calculated；It is more than preset times when the pressure difference is more than threshold pressure differential and the pressure difference and is more than the number of threshold pressure differential, then testing result Blocked for the ternary catalyzing unit；Otherwise after setting the ternary catalyzing unit forefront pressure as current ternary catalyzing unit end pressure and The pressure difference sum, and judge whether the exhaust gas flow in the blast pipe is more than zero；The ternary catalyzing unit is rear end close to exhaust outlet end, is front end away from exhaust outlet end.
- 10. device according to claim 9, it is characterised in that also including lambda sensor；The lambda sensor is used to measure the oxygen voltage in blast pipe, and corresponding oxygen concentration is calculated；The lambda sensor is two, and the first lambda sensor is located on blast pipe and passed close to ternary catalyzing unit front end, the second oxygen Sensor is located on blast pipe and close to ternary catalyzing unit rear end；For judging three according to the voltage waveform of described two lambda sensors Whether first catalyst converter blocks.
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| CN109944671B (en) * | 2017-12-20 | 2020-11-13 | 中国航天系统工程有限公司 | Three-way catalyst health state judgment system and method based on front and rear oxygen sensors |
| CN109057929A (en) * | 2018-08-30 | 2018-12-21 | 广东工业大学 | A kind of method and device of detection ternary catalyzing unit blocking |
| CN110872976A (en) * | 2018-09-04 | 2020-03-10 | 南京林业大学 | Three-way catalytic converter blocks up detection device |
| DE102018218209A1 (en) * | 2018-10-24 | 2020-04-30 | Robert Bosch Gmbh | Method for monitoring an exhaust gas aftertreatment system of an internal combustion engine |
| JP7207236B2 (en) * | 2019-08-28 | 2023-01-18 | トヨタ自動車株式会社 | engine device |
| CN110714824B (en) * | 2019-10-31 | 2022-05-17 | 重庆长安汽车股份有限公司 | End cone structure for detecting air outlet of three-way catalyst blockage |
| CN112648059B (en) * | 2020-12-23 | 2022-09-09 | 东风汽车集团有限公司 | Quick catalyst ignition device in cold start stage of engine and control method |
| CN113483948B (en) * | 2021-07-13 | 2023-09-12 | 无锡威孚力达催化净化器有限责任公司 | Differential pressure tube detection device and method |
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