CN101105427B - Three way catalytic converter critical aging test method - Google Patents
Three way catalytic converter critical aging test method Download PDFInfo
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- CN101105427B CN101105427B CN200610061674A CN200610061674A CN101105427B CN 101105427 B CN101105427 B CN 101105427B CN 200610061674 A CN200610061674 A CN 200610061674A CN 200610061674 A CN200610061674 A CN 200610061674A CN 101105427 B CN101105427 B CN 101105427B
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- 230000032683 aging Effects 0.000 title claims abstract description 43
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 26
- 238000010998 test method Methods 0.000 title description 5
- 238000012360 testing method Methods 0.000 claims abstract description 88
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000003054 catalyst Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 8
- 238000011156 evaluation Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 230000018109 developmental process Effects 0.000 abstract description 3
- 238000011056 performance test Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
A critical aging testing method for three-way catalytic converters comprises the following steps: step 1: determining the test control conditions of fast aging working state and test conditions of thecommon engine performance test bench; step 2: controlling the working state of the engine on the test bench according to the test control conditions, allowing the aging of the test sample; step 3: evaluating the catalytic conversion rate at a given time interval on the bench until the desired catalytic conversion rate is reached; step 4: loading the catalytic converter on a car, testing the exhaust emission of the whole car until the critical value; and step 5: analyzing the relationship between the catalytic conversion rate and the critical aging. The invention can predict the exhaust emission of the vehicle after driving tens of thousands kilometers within a short time period, greatly shorten the development time of vehicle exhaust system, and efficiently exerts the advantages of the bench test and whole car test. Additionally, the method has low cost and meets the EU III emission standards.
Description
[technical field]
The present invention relates to a kind of three way catalytic converter critical aging test method.
[background technology]
Europe onboard diagnostic system (EOBD) is that the abbreviation of European On Board Diagnostics is close with second generation onboard diagnostic system (OBD II), but pays attention to emission control more, and begin to promote the use of January 1 calendar year 2001.According to definition, it is " onboard diagnostic system that is used for emission control ", and must discern the possible range of fault by being stored in dead code in the computer memory.Normally, when discharging is about to exceed standard (critical conditions of emission control), alerting signal output must be arranged, with driver.Whether discharging faces and exceeds standard, and when concentration changed, the mistiming of response was judged by the lambda sensor that is loaded on the ternary catalyzing unit front and back.So, when being EOBD, must demarcate under the discharging critical conditions, the response time of lambda sensor is poor.Under the prerequisite of EMS than maturation, what emission status was played an important role is ternary catalyzing unit, on stream, it is poor that desire is demarcated the response time of lambda sensor under the discharging critical conditions, a critical aging ternary catalyzing unit must be provided, when making this ternary catalyzing unit be loaded on the car, discharging is in critical ageing state.So in the new car exploitation, need to provide several by aging ternary catalyzing unit, after these catalyst converter entruckings, test exhaust emissions situation, arrive critical conditions, by the consistance of relatively verifying catalyst converter quality and coupling to a plurality of aging catalyst converters.
How to make the ternary catalyzing unit quick aging?
Does discharging arrive critical conditions after how predicting the ternary catalyzing unit quick aging?
How about is this critical conditions judged on threst stand?
These three problems need to solve accurately and effectively, and also are the difficult points of technology.
[summary of the invention]
The purpose of this invention is to provide a kind of generic engine performance test-bed that utilizes and carry out the critical aging test method of ternary catalyzing unit, this method is simple effectively, the time is short, cost is low.
The critical aging testing method of a kind of ternary catalyzing unit comprises the steps:
Step 1: test controlled condition and the test condition on the generic engine performance test-bed of determining conditions of fast aging working;
Step 2: on test-bed, engine is carried out operating mode control according to test controlled condition, test specimen is worn out;
Step 3: timing evaluation catalytic conversion on stand, until the catalytic conversion that reaches demarcation;
Step 4: with the catalyst converter entrucking, car load carries out emission test, until reaching the discharging critical value;
Step 5: sum up critical aging catalytic conversion and critical aging relation.
Described test controlled condition is: engine excess air coefficient equal 1 or greater than 1 situation under alternately steady working condition, oil-break working condition tests; Delivery temperature is controlled at the condition of high temperature, and remains on 700 ℃-800 ℃; The air speed of exhaust remains on 60000h
-1
Described engine is carried out in the operating mode control, by carrying out the engine load characteristic test, the connection and the disconnection of control oil spout main circuit equal 1 or greater than 1 operating mode to obtain the engine exhaust excess air coefficient.
During the described test condition of determining on the generic engine performance test-bed, according to the principle of the mass conservation, determine the operating point on the conventional test stand, this operating point satisfies air speed and fuel consumption requirement simultaneously.
During described evaluation catalytic conversion, 250 ℃-500 ℃ of row's temperature, engine under sub-load, testing catalytic device transformation efficiency.
In the described step 6, in the catalyst converter service testing,, think that so catalyst converter is aged to critical condition if discharging exceeds standard 5%.
Described operating point determines that method comprises: after obtaining target row's temperature and target airspeed, by carrying out the part throttle characteristics test, at different rotating speeds, the operating mode that needs is progressively sought in the operation down of different throttles.
The critical aging testing method of described ternary catalyzing unit: rotating speed is 200rpm at interval, accelerator open degree interval 2%.
The connection of described control oil spout main circuit and disconnection realize by setting up in the on-off circuit of oil spout main circuit front end.
The critical aging testing method of described ternary catalyzing unit a: buffer capacitor is set, in described on-off circuit to reduce the recoil electromotive force of described oil spout main circuit.
The present invention can dope the emission behaviour of vehicle after exercising tens thousand of kilometers at short notice.Shorten the development time of vehicle widely at exhaust system; Can bring into play the advantage of bench test and complete vehicle test effectively.Bench test can be aging apace with ternary catalyzing unit, and complete vehicle test has reflected the emission behaviour when ternary catalyzing unit is aged to this stage exactly; When the automobile of EU III emission standard was satisfied in exploitation, owing to will discharge critical warning, this method can be aged to critical conditions with catalyst converter effectively, and can demarcate.Because the test condition of this method can keep consistency, therefore can accurately test: Europe III type approval and conformity of production emission limit meet EU III definition requirement; And this method cost is very low, can finish the work of the overwhelming majority on common threst stand.
[description of drawings]
The critical aging method process flow diagram of Fig. 1 ternary catalyzing unit.
Fig. 2 engine fuel injection control circuit sketch.
[embodiment]
The present invention is described in further detail below by embodiment.
Step 1: confirmed test controlled condition;
According to the chemical property of ternary catalyzing unit, when its working temperature was 700 ℃-800 ℃, products of combustion and the combination gas partially rare products of combustion of combination gas under the EMS closed-loop control made ternary catalyzing unit aging easily.According to studies show that of Delphi (delphi), under the rare partially condition of work of combination gas, the time of the work of catalyst converter must not surpass 1% of its life time; According to the technical requirement and the test method of GB/T18377 gasoline automotive catalytic converter, decision uses threst stand that three-way catalytic converter is worn out again.
Test controlled condition is as follows:
Step 2: on the generic engine performance test-bed, the definite test condition that needs of the principle of the utilization mass conservation;
The present invention uses the principle of the mass conservation, under air speed is certain situation, and for according to converting under the standard state, and the composition of exhaust is to be formed by air and gasoline combustion product, its density under standard state can be calculated, so the quality of exhaust can be calculated.Computation process is as follows:
A/F＝14.7
Q1=ρ arranges h
-1L
Q2＝A+F
Q1＝Q2
Wherein, A is the specific air consumption under the engine closed-loop control; F is the fuel consumption under the engine closed-loop control; A/F is an air-fuel ratio; Q1 is the exhaust gross mass under the demand air speed; Q2 is the gross mass of the fuel oil of air inlet and burning; L is the catalyst converter volume.
As shown from the above formula, under the corresponding air speed,, can calculate the quality of consumed cabin air by the consumption quality of test fuel oil.By the principle of the mass conservation, can search out the fuel consumption operating mode of a correspondence.On the generic engine performance test-bed, seek a suitable operating point, satisfy air speed and fuel consumption requirement simultaneously.
Step 3: the correlation test sample is installed on test-bed;
When the correlation test sample is installed, note consistent with the exhaust system of former automobile as far as possible.And the installation of exhaust temperature sensor, from front end catalyst converter inlet 1cm, the contrary 30 ℃ of central authorities that extend gas outlet of air-flow of probe.
Step 4: engine is carried out operating mode control by test controlled condition;
By carrying out the engine load attribute testing, the connection and the disconnection of control oil spout main circuit are to obtain the situation of engine exhaust air excess factor=1 and λ＞1; By carrying out part throttle characteristics test, at different rotating speeds, test under the different throttles, wherein, rotating speed is 200rpm at interval, and each accelerator open degree at interval 2% is progressively sought the operating mode that needs, and seeks with the method, only needs 2 hours.
The operating mode time adopts " stablize 60s " and " oil-break 5s " to hocket, and equals 1 at the engine excess air coefficient, excess air coefficient hockets test under greater than 1 situation, and working temperature is controlled at 760 ℃, and the air speed of maintenance exhaust is at 60000h
-1, up to using catalyst converter to be aged to critical condition, about more than 200 hours.
Frock in this test neither needs special EMS, ECU, does not also influence the serviceability of engine and EMS.In circuit as shown in Figure 2, increased a suitable buffer capacitor C, avoid relay K when break-make, fuel injector recoil electromotive force is to the influence of EMS.Realize the requirement of operating condition of test by the break-make of pilot relay.
Step 5: after a period of time is carried out in test, on stand, estimate catalytic conversion;
According to above-mentioned test condition, after digestion time has been carried out 200 hours, in the catalytic conversion of engine bench test three-way catalytic converter.Get between near the row's warm area 300 ℃ and test, engine every 50 ℃, is tested a point under sub-load, and the storage necessary data.Mainly be to investigate hydrocarbon (HC) conversion ratio with this test.
Step 6: with the catalyst converter entrucking, car load carries out emission test;
According to EU III15 operating condition method (when whether testing vehicle satisfies Europe III type approval and conformity of production emission limit, during vehicle test, the operating mode of operation), test discharging on chassis dynamometer is observed catalytic conversion and whether is reached critical value.
Whether check reaches the discharging critical value of EU III (Central European III type approval of European Union's relevant regulations and conformity of production emission limit) regulation.
According to the rules of China, when emission test, test value can be allowed and exceeded standard 20%.In this example, exceed standard 5%, be considered as discharging and arrived critical value, critical aging the completing of ternary catalyzing unit if catalyst converter in above-mentioned test, discharges; If do not arrive critical value, ternary catalyzing unit return engine test-bed to be tested, every test repeated above-mentioned test after 10 hours, reached till the requirement.
Step 7: sum up critical aging catalytic conversion and critical aging relation;
The catalytic conversion that will reach critical value is as the aging important judgement reference frame of similar catalyst converter next time, and obtain the conversion ratio that catalyst converter arrives catalyst converter under the critical aging condition by above-mentioned steps, directly ternary catalyzing unit is carried out critical aging test at stand.Reduce on car load test discharging, the stand and continue aging circulation back and forth.
The present invention can dope the emission behaviour of vehicle after exercising tens thousand of kilometers at short notice.Shorten the development time of vehicle widely at exhaust system; Can bring into play the advantage of bench test and complete vehicle test effectively.Bench test can be aging apace with ternary catalyzing unit, and complete vehicle test has reflected the emission behaviour when ternary catalyzing unit is aged to this stage exactly; When the automobile of EU III emission standard was satisfied in exploitation, owing to will discharge critical warning, this method can be aged to critical conditions with catalyst converter effectively, and can demarcate.Because the test condition of this method can keep consistency, therefore can accurately test: Europe III type approval and conformity of production emission limit meet EU III definition requirement; And this method cost is very low, can finish the work of the overwhelming majority on common threst stand.
Claims (9)
1. the critical aging testing method of ternary catalyzing unit comprises the steps:
Step 1: test controlled condition and the test condition on the generic engine performance test-bed of determining conditions of fast aging working;
Step 2: on test-bed, engine is carried out operating mode control according to test controlled condition, test specimen is worn out;
Step 3: timing evaluation catalytic conversion on stand, until the catalytic conversion that reaches demarcation;
Step 4: with the catalyst converter entrucking, car load carries out emission test, until reaching the discharging critical value;
Step 5: sum up critical aging catalytic conversion and critical aging relation.
2. the critical aging testing method of ternary catalyzing unit according to claim 1 is characterized in that; Described test controlled condition is: engine excess air coefficient equal 1 or greater than 1 situation under alternately steady working condition, oil-break working condition tests; Delivery temperature is controlled at the condition of high temperature, and remains on 700 ℃-800 ℃; The air speed of exhaust remains on 60000h
-1
3. the critical aging testing method of ternary catalyzing unit according to claim 1, it is characterized in that: described engine is carried out in the operating mode control, by carrying out the engine load characteristic test, the connection and the disconnection of control oil spout main circuit equal 1 or greater than 1 operating mode to obtain the engine exhaust excess air coefficient.
4. the critical aging testing method of ternary catalyzing unit according to claim 1, it is characterized in that: during the described test condition of determining on the generic engine performance test-bed, principle according to the mass conservation, determine the operating point on the conventional test stand, this operating point satisfies air speed and fuel consumption requirement simultaneously.
5. the critical aging testing method of ternary catalyzing unit according to claim 1 is characterized in that: during described evaluation catalytic conversion, 250 ℃-500 ℃ of row's temperature, engine under sub-load, testing catalytic device transformation efficiency.
6. as the critical aging testing method of ternary catalyzing unit as described in the claim 4, it is characterized in that: described operating point determines that method comprises: after obtaining target row's temperature and target airspeed, by carrying out the part throttle characteristics test, at different rotating speeds, the operating mode that needs is progressively sought in the operation down of different throttles.
7. as the critical aging testing method of ternary catalyzing unit as described in the claim 6, it is characterized in that: rotating speed is 200rpm at interval, accelerator open degree at interval 2%.
8. as the critical aging testing method of ternary catalyzing unit as described in the claim 3, it is characterized in that: the connection of described control oil spout main circuit and disconnecting by setting up in the on-off circuit of oil spout main circuit front end realizes.
9. as the critical aging testing method of ternary catalyzing unit as described in the claim 8, it is characterized in that: a buffer capacitor is set, in described on-off circuit to reduce the recoil electromotive force of described oil spout main circuit.
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| CN200610061674A CN101105427B (en) | 2006-07-12 | 2006-07-12 | Three way catalytic converter critical aging test method |
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| CN200610061674A CN101105427B (en) | 2006-07-12 | 2006-07-12 | Three way catalytic converter critical aging test method |
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| CN101105427B true CN101105427B (en) | 2010-05-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169057B (en) * | 2010-02-27 | 2013-08-07 | 比亚迪股份有限公司 | Aging method for three-way catalytic converter |
| CN102419260A (en) * | 2011-09-08 | 2012-04-18 | 中国汽车技术研究中心 | Bench test method orienting to rapid ageing of car catalytic converter |
| CN103234760B (en) * | 2013-03-30 | 2015-10-28 | 长城汽车股份有限公司 | A kind of method of testing judging consistency of original emission performance of engine |
| CN107219323B (en) * | 2017-05-22 | 2019-12-10 | 中自环保科技股份有限公司 | method for evaluating durability of motorcycle catalyst |
| CN108844794B (en) * | 2018-06-21 | 2020-09-15 | 天津索克汽车试验有限公司 | Preparation method of equivalent full-life ash degradation sample piece of gasoline car particle catcher |
| CN109387377B (en) * | 2018-09-04 | 2021-05-11 | 昆明贵研催化剂有限责任公司 | Rapid aging method for catalytic gasoline particle trap |
| CN112664303B (en) * | 2020-12-25 | 2022-07-15 | 潍柴动力股份有限公司 | Engine aftertreatment protection method, device, equipment and storage medium |
| CN114659795A (en) * | 2021-12-03 | 2022-06-24 | 江铃汽车股份有限公司 | Bench experiment method for ignition performance of vehicle catalytic converter |
| CN114705433A (en) * | 2022-03-31 | 2022-07-05 | 江铃汽车股份有限公司 | Aging measurement method, system, computer equipment and storage medium for catalytic converter stand |
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|---|---|---|---|---|
| US6216448B1 (en) * | 1998-01-17 | 2001-04-17 | Robert Bosch Gmbh | Method of diagnosing an NOX storage catalytic converter during operation of an internal combustion engine |
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| CN1142819C (en) * | 1998-02-27 | 2004-03-24 | 大众汽车有限公司 | Control of an NOx-absorbing catalytic converter |
| EP0980967B1 (en) * | 1998-08-19 | 2004-10-13 | Toyota Jidosha Kabushiki Kaisha | Catalyst deterioration detector and method of detecting deterioration of catalyst |
| CN1789678A (en) * | 2004-12-14 | 2006-06-21 | 日产自动车株式会社 | Catalytic converter degradation determining system |
-
2006
- 2006-07-12 CN CN200610061674A patent/CN101105427B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6216448B1 (en) * | 1998-01-17 | 2001-04-17 | Robert Bosch Gmbh | Method of diagnosing an NOX storage catalytic converter during operation of an internal combustion engine |
| CN1142819C (en) * | 1998-02-27 | 2004-03-24 | 大众汽车有限公司 | Control of an NOx-absorbing catalytic converter |
| EP0980967B1 (en) * | 1998-08-19 | 2004-10-13 | Toyota Jidosha Kabushiki Kaisha | Catalyst deterioration detector and method of detecting deterioration of catalyst |
| CN1415045A (en) * | 1999-12-31 | 2003-04-30 | 罗伯特-博希股份公司 | Method for operating three-way catalyst of IC engine |
| CN1789678A (en) * | 2004-12-14 | 2006-06-21 | 日产自动车株式会社 | Catalytic converter degradation determining system |
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