CN105673169A - Method and device used for monitoring three-way catalyst in engine exhaust system - Google Patents
Method and device used for monitoring three-way catalyst in engine exhaust system Download PDFInfo
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- CN105673169A CN105673169A CN201610052919.4A CN201610052919A CN105673169A CN 105673169 A CN105673169 A CN 105673169A CN 201610052919 A CN201610052919 A CN 201610052919A CN 105673169 A CN105673169 A CN 105673169A
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- ternary catalyzing
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a method and device used for monitoring a three-way catalyst in an engine exhaust system. The method comprises the steps that the excess air coefficient of the inlet end of the three-way catalyst is adjusted according to the operation parameters of an engine; the jumping time of output voltage of a sensor installed at the outlet end of the three-way catalyst is detected; the jumping time is compared with the preset nominal time to obtain a comparative result; and according to the comparative result, whether the three-way catalyst is removed or ages is judged, and accordingly monitoring of the three-way catalyst is achieved. The three-way catalyst can be monitored online in real time by actively adjusting the excess air coefficient of the inlet end of the three-way catalyst and detecting the jumping time of output voltage of the sensor installed at the outlet end of the three-way catalyst.
Description
Technical field
The present invention relates to ternary catalyzing unit field, in particular it relates to a kind of method for monitoring ternary catalyzing unit in engine exhaust system and device.
Background technology
Ternary catalyzing unit (Three-Way-Catalyst) is mounted in automobile exhaust system most important outer purifier, and the harmful gass such as CO, HC and NOx that vehicle exhaust is discharged can be changed into harmless carbon dioxide, water and nitrogen by oxidation and reduction by it. When the vehicle exhaust of high temperature is by outer purifier, the cleanser in ternary catalyzing unit, by strengthening the activity of CO, HC and NOx these three gas, promotes it to carry out certain oxidation-reduction chemical reaction. Wherein, CO is at high temperature oxidized into colourless, nontoxic carbon dioxide; HC compound is at high temperature oxidized to water (H2And carbon dioxide O); NOx is reduced into nitrogen and oxygen. These three harmful gas becomes innocuous gas so that vehicle exhaust is purified. Owing to three kinds of main harmful substances in waste gas can be converted into innocuous substance by this catalyst converter simultaneously, therefore claim ternary. In concrete application, three major pollutants CO, HC and NOx in aerofluxus can be purified due to ternary catalyzing unit simultaneously, and conversion efficiency is the highest near chemically correct fuel, therefore, the route of chemically correct fuel+ternary catalyzing unit is widely popularized to meet the emission regulation demands of increasingly stringent.
But, if the three-way catalytic converter aging in engine exhaust system or be removed, then motor vehicle exhaust emission can be transfinited significantly. At present still do not diagnose ternary catalyzing unit conversion efficiency or/and the control strategy that is removed.
Summary of the invention
It is an object of the invention to provide a kind of method for monitoring ternary catalyzing unit in engine exhaust system and device. Wherein, the described method excess air coefficient by active adjustment ternary catalyzing unit entrance point, and detect the transit times of the output voltage of the sensor being installed on the ternary catalyzing unit port of export, it is possible to on-line real time monitoring ternary catalyzing unit.
To achieve these goals, the present invention provides a kind of for monitoring the method for ternary catalyzing unit in engine exhaust system. Described method includes: regulate the excess air coefficient of described ternary catalyzing unit entrance point according to the operational factor of electromotor; Detection is installed on the transit times of the output voltage of the sensor of the described ternary catalyzing unit port of export; Described transit times was compared with the nominal time preset, obtains comparative result; And judge whether described ternary catalyzing unit is removed or whether described ternary catalyzing unit is aging according to described comparative result, thus realizing the monitoring of described ternary catalyzing unit.
Wherein, described sensor is switching mode oxygen sensor.
Wherein, described method specifically includes: increase the excess air coefficient of described ternary catalyzing unit entrance point according to the operational factor of described electromotor so that the combustion mixture of described electromotor is lean mixture; The output voltage detecting described sensor becomes the first transit times of the first voltage; When described first transit times is more than the default nominal time, it is judged that described ternary catalyzing unit is not removed, and unaged.
Wherein, when described first transit times is less than or equal to the default nominal time, described method also includes: the excess air coefficient of described ternary catalyzing unit entrance point is remained unchanged in preset time period, so that described ternary catalyzing unit absorbs oxygen to saturation; Operational factor according to described electromotor reduces the excess air coefficient of described ternary catalyzing unit entrance point so that the combustion mixture of described electromotor is rich mixture; The output voltage detecting described sensor becomes the second transit times of the second voltage; When described second transit times is less than or equal to the default nominal time, it is judged that described ternary catalyzing unit is removed.
Wherein, when described second transit times is more than the default nominal time, described method also includes: the exhaust air mass flow obtained according to described second transit times and the operational factor by described electromotor is tabled look-up and obtained the conversion efficiency of described ternary catalyzing unit; When described conversion efficiency is less than or equal to default efficiency threshold, it is judged that described three-way catalytic converter aging, when described conversion efficiency is more than default efficiency threshold, it is judged that described ternary catalyzing unit is unaged.
Correspondingly, the present invention also provides for a kind of for monitoring the device of ternary catalyzing unit in engine exhaust system. Described device includes: regulon, regulates the excess air coefficient of described ternary catalyzing unit entrance point for the operational factor according to electromotor; Detection unit, for detecting the transit times of the output voltage of the sensor being installed on the described ternary catalyzing unit port of export; Comparing unit, for being compared with the nominal time preset by described transit times, obtains comparative result; And judging unit, for judging whether described ternary catalyzing unit is removed or whether described ternary catalyzing unit is aging according to described comparative result, thus realizing the monitoring of described ternary catalyzing unit.
Wherein, described sensor is switching mode oxygen sensor.
Wherein, described regulon, it is additionally operable to the operational factor according to described electromotor and increases the excess air coefficient of described ternary catalyzing unit entrance point so that the combustion mixture of described electromotor is lean mixture; Described detection unit, the output voltage being additionally operable to detect described sensor becomes the first transit times of the first voltage; Described judging unit, for when described first transit times is more than the default nominal time, it is judged that described ternary catalyzing unit is not removed, and unaged.
Wherein, described regulon, it is additionally operable to remain unchanged in preset time period so that the excess air coefficient of described ternary catalyzing unit entrance point, so that described ternary catalyzing unit absorbs oxygen to saturation, and the excess air coefficient of the operational factor described ternary catalyzing unit entrance point of reduction according to described electromotor so that the combustion mixture of described electromotor is rich mixture; Described detection unit, the output voltage being additionally operable to detect described sensor becomes the second transit times of the second voltage;Described judging unit, is additionally operable to when described second transit times is less than or equal to the default nominal time, it is judged that described ternary catalyzing unit is removed.
Wherein, described device also includes: search unit, exhaust air mass flow for obtaining according to described second transit times and the operational factor by described electromotor is tabled look-up and is obtained the conversion efficiency of described ternary catalyzing unit, described judging unit, it is additionally operable to when described conversion efficiency is less than or equal to default efficiency threshold, judge described three-way catalytic converter aging, when described conversion efficiency is more than default efficiency threshold, it is judged that described ternary catalyzing unit is unaged.
By technique scheme, regulate the excess air coefficient of ternary catalyzing unit entrance point according to the operational factor of electromotor; Detection is installed on the transit times of the output voltage of the sensor of the ternary catalyzing unit port of export; Transit times was compared with the nominal time preset, obtains comparative result; And judge whether ternary catalyzing unit is removed or whether ternary catalyzing unit is aging according to comparative result, thus realizing the monitoring of ternary catalyzing unit, it is possible to on-line real time monitoring ternary catalyzing unit, save cost, and reliability has met actually used demand.
Accompanying drawing explanation
Fig. 1 is provided by the invention for monitoring the flow chart of the method for ternary catalyzing unit in engine exhaust system;
Fig. 2 is provided by the invention for monitoring the particular flow sheet of the method for ternary catalyzing unit in engine exhaust system;
Fig. 3 is the installation site schematic diagram of the oxygen sensor of ternary catalyzing unit and entrance point and the port of export;
Fig. 4 is provided by the invention for monitoring the structural representation of the device of ternary catalyzing unit in engine exhaust system.
Description of reference numerals
10 entrance point oxygen sensor 20 ternary catalyzing unit 30 port of export oxygen sensors
40 regulons 50 detect unit 60 comparing unit 70 judging unit
80 search unit
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail. It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
Fig. 1 is provided by the invention for monitoring the flow chart of the method for ternary catalyzing unit in engine exhaust system. Include for monitoring the method for ternary catalyzing unit in engine exhaust system as it is shown in figure 1, provided by the invention: in step S101, regulate the excess air coefficient of described ternary catalyzing unit entrance point according to the operational factor of electromotor. Then, in step s 102, detection is installed on the transit times of the output voltage of the sensor of the described ternary catalyzing unit port of export. And then, in step s 103, described transit times was compared with the nominal time preset, obtains comparative result. Finally, in step S104, judge whether described ternary catalyzing unit is removed or whether described ternary catalyzing unit is aging according to described comparative result, thus realizing the monitoring of described ternary catalyzing unit. Thereby, it is possible to on-line real time monitoring ternary catalyzing unit, save cost, and reliability has met actually used demand.
Fig. 2 is provided by the invention for monitoring the particular flow sheet of the method for ternary catalyzing unit in engine exhaust system. As in figure 2 it is shown, before applying method provided by the invention, it is necessary to judge whether to meet the condition of monitoring ternary catalyzing unit. Wherein, described condition includes reaching monitoring interval, and engine speed and exhaust air mass flow and keep a period of time in certain scope, and row's temperature, ambient temperature and ambient pressure are in normal scope, and oxygen closed loop, without related sensor mistake etc. When judging to meet monitoring ternary catalyzing unit, increase the excess air coefficient of described ternary catalyzing unit entrance point according to the operational factor of described electromotor so that the combustion mixture of described electromotor is lean mixture. Wherein, when excess air coefficient is equal to 1, the combustion mixture of described electromotor is theoretical mixture gas (now fuel burns completely with the oxygen in air), when excess air coefficient is less than 1, the combustion mixture of described electromotor is rich mixture, when excess air coefficient is more than 1, the combustion mixture of described electromotor is lean mixture.Specifically, the excess air coefficient increasing ternary catalyzing unit entrance point is offset (as make excess air coefficient be 1.05) by theoretical value 1 to partially rare direction. It is then detected that the output voltage of described sensor becomes the first transit times of the first voltage, and judge that whether described first transit times is more than the default nominal time. When described first transit times is more than the default nominal time, illustrate that ternary catalyzing unit oxygen storage capacity is strong, and conversion efficiency is high, judge that described ternary catalyzing unit is not removed, and unaged, after cumulative time zero setting being monitored, electromotor normal closed loop works, and the monitoring time adds up. Wherein, described first voltage is low-voltage, it is specially 0.1V-0.3V, described first transit times refers to the time jumping to voltage 0.1V-0.3V from voltage 0.3V-0.7V, and the described default nominal time is comprehensively determined by exhaust air mass flow, row's temperature, ternary catalyzing unit length and engine on time. Specifically, the output voltage of sensor is when 0.1V-0.3V, then show that the combustion mixture from ternary catalyzing unit output is lean mixture, the output voltage of sensor is when 0.3V-0.7V, then show that the combustion mixture from ternary catalyzing unit output is theoretical mixture gas, the output voltage of sensor is when 0.7V-1V, then show that the combustion mixture from ternary catalyzing unit output is rich mixture, when the first transit times is more than the default nominal time, then show the oxygen in the combustion mixture that ternary catalyzing unit is little by little drawn into, until by full for oxygen storage. After ternary catalyzing unit is by oxygen storage completely, the output voltage instruction of sensor is lean mixture from the combustion mixture of ternary catalyzing unit output.
When described first transit times is less than or equal to the default nominal time, illustrates that ternary catalyzing unit has been removed or ternary catalyzing unit is not removed but oxygen has stored up full, then need further method to determine the state of ternary catalyzing unit. Described method includes: first so that the excess air coefficient of described ternary catalyzing unit entrance point remains unchanged in preset time period, so that described ternary catalyzing unit absorbs oxygen to saturation. Secondly, the excess air coefficient of described ternary catalyzing unit entrance point is reduced according to the operational factor of described electromotor so that the combustion mixture of described electromotor is rich mixture. Specifically, the excess air coefficient extremely partially dense state (such as 0.95) of engine combustion gaseous mixture is reduced. It is then detected that the output voltage of described sensor becomes the second transit times of the second voltage, and judge that whether described second transit times is more than the default nominal time. When described second transit times is less than or equal to the default nominal time, it is judged that described ternary catalyzing unit is removed, and system reports DFC (fault detection system). Wherein, described second voltage is high voltage, is specially 0.7V-1V, and described second transit times refers to the time jumping to voltage 0.7V-1V from voltage 0.1V-0.3V. Specifically, ternary catalyzing unit absorbs oxygen to saturation, and second transit times less than or equal to the default nominal time when, the output voltage instruction of sensor is rich mixture from the combustion mixture of ternary catalyzing unit output, show that ternary catalyzing unit is removed, system reports DFC, triggers corresponding degradation.
When described second transit times is more than the default nominal time, illustrate that ternary catalyzing unit is not removed, flow into the overrich waste gas of ternary catalyzing unit first by the oxygen compensatory reactionBu Changfanying of ternary catalyzing unit, until the oxygen of ternary catalyzing unit releases sensor completely and dense waste gas just detected, but whether uncertain ternary catalyzing unit is aging, then whether ternary catalyzing unit is aging to need further method to determine.Described method includes: first, and the exhaust air mass flow obtained according to described second transit times and the operational factor by described electromotor is tabled look-up and obtained the conversion efficiency of described ternary catalyzing unit. Finally, it is judged that whether conversion efficiency is more than default efficiency threshold. When described conversion efficiency is less than or equal to default efficiency threshold, it is judged that described three-way catalytic converter aging, system reports DFC, triggers corresponding degradation. When described conversion efficiency is more than default efficiency threshold, it is judged that described ternary catalyzing unit is unaged, will after monitoring cumulative time zero setting, electromotor normal closed loop works, and the monitoring time adds up.
Fig. 3 is the installation site schematic diagram of the oxygen sensor of ternary catalyzing unit and entrance point and the port of export. As shown in Figure 3, it is installed on the entrance point oxygen sensor 10 of ternary catalyzing unit entrance point, for measuring the excess air coefficient of ternary catalyzing unit entrance point, whether system is measured, according to entrance point oxygen sensor 10, the excess air coefficient obtained and is judged whether to be regulated by the excess air coefficient of ternary catalyzing unit 20 entrance point to put in place, it is installed on the port of export oxygen sensor 30 of the ternary catalyzing unit port of export, for the dense rare output voltage signal according to engine combustion gaseous mixture, that is to say with voltage signal measurement waste gas dense rare. In a particular embodiment, entrance point oxygen sensor 10 is broad domain oxygen sensor, and port of export oxygen sensor 30 is switching mode oxygen sensor.
Correspondingly, the present invention also provides for a kind of for monitoring the device of ternary catalyzing unit in engine exhaust system. Fig. 4 is provided by the invention for monitoring the structural representation of the device of ternary catalyzing unit in engine exhaust system. As shown in Figure 4, provided by the invention include for monitoring the device of ternary catalyzing unit in engine exhaust system: regulon 40, regulate the excess air coefficient of described ternary catalyzing unit entrance point for the operational factor according to electromotor; Detection unit 50, for detecting the transit times of the output voltage of the sensor being installed on the described ternary catalyzing unit port of export; Comparing unit 60, for being compared with the nominal time preset by described transit times, obtains comparative result; And judging unit 70, for judging whether described ternary catalyzing unit is removed or whether described ternary catalyzing unit is aging according to described comparative result, thus realizing the monitoring of described ternary catalyzing unit.
Wherein, described sensor is switching mode oxygen sensor.
Specifically, described regulon 40, it is additionally operable to the operational factor according to described electromotor and increases the excess air coefficient of described ternary catalyzing unit entrance point so that the combustion mixture of described electromotor is lean mixture; Described detection unit 50, the output voltage being additionally operable to detect described sensor becomes the first transit times of the first voltage; Described judging unit 70, for when described first transit times is more than the default nominal time, it is judged that described ternary catalyzing unit is not removed, and unaged.
In concrete application, described regulon 40, it is additionally operable to remain unchanged in preset time period so that the excess air coefficient of described ternary catalyzing unit entrance point, so that described ternary catalyzing unit absorbs oxygen to saturation, and the excess air coefficient of the operational factor described ternary catalyzing unit entrance point of reduction according to described electromotor so that the combustion mixture of described electromotor is rich mixture; Described detection unit 50, the output voltage being additionally operable to detect described sensor becomes the second transit times of the second voltage;Described judging unit 70, is additionally operable to when described second transit times is less than or equal to the default nominal time, it is judged that described ternary catalyzing unit is removed.
In a particular embodiment, described device also includes: search unit 80, exhaust air mass flow for obtaining according to described second transit times and the operational factor by described electromotor is tabled look-up and is obtained the conversion efficiency of described ternary catalyzing unit, described judging unit 70, it is additionally operable to when described conversion efficiency is less than or equal to default efficiency threshold, judge described three-way catalytic converter aging, when described conversion efficiency is more than default efficiency threshold, it is judged that described ternary catalyzing unit is unaged.
It should be noted that, for monitoring in engine exhaust system, the method for ternary catalyzing unit is described in detail provided by the invention for monitoring the detail that in engine exhaust system, the device of ternary catalyzing unit further relates to for provided by the invention, is not repeating at this.
The present invention need not install any equipment additional, gets final product line real time diagnosis ternary catalyzing unit efficiency or/and remove by existing apparatus, has saved cost, and reliability meets actually used demand. Oxygen storage capacity diagnosis efficiency according to ternary catalyzing unit is or/and remove, change the excess air coefficient of ternary catalyzing unit entrance point, observe the response time of the oxygen sensor of the ternary catalyzing unit port of export, as response time is too short, ternary catalyzing unit is removed, and as ternary catalyzing unit does not remove, response time and exhaust air mass flow are tabled look-up and obtained ternary catalyzing unit efficiency.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode, in order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by the present invention separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. one kind is used for monitoring the method for ternary catalyzing unit in engine exhaust system, it is characterised in that described method includes:
Operational factor according to electromotor regulates the excess air coefficient of described ternary catalyzing unit entrance point;
Detection is installed on the transit times of the output voltage of the sensor of the described ternary catalyzing unit port of export;
Described transit times was compared with the nominal time preset, obtains comparative result; And
Judge whether described ternary catalyzing unit is removed or whether described ternary catalyzing unit is aging according to described comparative result, thus realizing the monitoring of described ternary catalyzing unit.
2. according to claim 1 for monitoring the method for ternary catalyzing unit in engine exhaust system, it is characterised in that described sensor is switching mode oxygen sensor.
3. according to claim 1 for monitoring the method for ternary catalyzing unit in engine exhaust system, it is characterised in that described method specifically includes:
Operational factor according to described electromotor increases the excess air coefficient of described ternary catalyzing unit entrance point so that the combustion mixture of described electromotor is lean mixture;
The output voltage detecting described sensor becomes the first transit times of the first voltage;
When described first transit times is more than the default nominal time, it is judged that described ternary catalyzing unit is not removed, and unaged.
4. according to claim 3 for monitoring the method for ternary catalyzing unit in engine exhaust system, it is characterised in that when described first transit times is less than or equal to the default nominal time, described method also includes:
The excess air coefficient making described ternary catalyzing unit entrance point remains unchanged in preset time period, so that described ternary catalyzing unit absorbs oxygen to saturation;
Operational factor according to described electromotor reduces the excess air coefficient of described ternary catalyzing unit entrance point so that the combustion mixture of described electromotor is rich mixture;
The output voltage detecting described sensor becomes the second transit times of the second voltage;
When described second transit times is less than or equal to the default nominal time, it is judged that described ternary catalyzing unit is removed.
5. according to claim 4 for monitoring the method for ternary catalyzing unit in engine exhaust system, it is characterised in that when described second transit times is more than the default nominal time, described method also includes:
The exhaust air mass flow obtained according to described second transit times and the operational factor by described electromotor is tabled look-up and is obtained the conversion efficiency of described ternary catalyzing unit;
When described conversion efficiency is less than or equal to default efficiency threshold, it is judged that described three-way catalytic converter aging, when described conversion efficiency is more than default efficiency threshold, it is judged that described ternary catalyzing unit is unaged.
6. one kind is used for monitoring the device of ternary catalyzing unit in engine exhaust system, it is characterised in that described device includes:
Regulon, regulates the excess air coefficient of described ternary catalyzing unit entrance point for the operational factor according to electromotor;
Detection unit, for detecting the transit times of the output voltage of the sensor being installed on the described ternary catalyzing unit port of export;
Comparing unit, for being compared with the nominal time preset by described transit times, obtains comparative result; And
According to described comparative result, judging unit, for judging whether described ternary catalyzing unit is removed or whether described ternary catalyzing unit is aging, thus realizing the monitoring of described ternary catalyzing unit.
7. according to claim 6 for monitoring the device of ternary catalyzing unit in engine exhaust system, it is characterised in that described sensor is switching mode oxygen sensor.
8. according to claim 6 for monitoring the device of ternary catalyzing unit in engine exhaust system, it is characterised in that
Described regulon, is additionally operable to the operational factor according to described electromotor and increases the excess air coefficient of described ternary catalyzing unit entrance point so that the combustion mixture of described electromotor is lean mixture;
Described detection unit, the output voltage being additionally operable to detect described sensor becomes the first transit times of the first voltage;
Described judging unit, for when described first transit times is more than the default nominal time, it is judged that described ternary catalyzing unit is not removed, and unaged.
9. according to claim 8 for monitoring the device of ternary catalyzing unit in engine exhaust system, it is characterised in that
Described regulon, it is additionally operable to remain unchanged in preset time period so that the excess air coefficient of described ternary catalyzing unit entrance point, so that described ternary catalyzing unit absorbs oxygen to saturation, and the excess air coefficient of the operational factor described ternary catalyzing unit entrance point of reduction according to described electromotor so that the combustion mixture of described electromotor is rich mixture;
Described detection unit, the output voltage being additionally operable to detect described sensor becomes the second transit times of the second voltage;
Described judging unit, is additionally operable to when described second transit times is less than or equal to the default nominal time, it is judged that described ternary catalyzing unit is removed.
10. according to claim 9 for monitoring the device of ternary catalyzing unit in engine exhaust system, it is characterised in that described device also includes:
Searching unit, the exhaust air mass flow for obtaining according to described second transit times and the operational factor by described electromotor is tabled look-up and is obtained the conversion efficiency of described ternary catalyzing unit,
Described judging unit, is additionally operable to when described conversion efficiency is less than or equal to default efficiency threshold, it is judged that described three-way catalytic converter aging, when described conversion efficiency is more than default efficiency threshold, it is judged that described ternary catalyzing unit is unaged.
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| CN107542558A (en) * | 2016-06-28 | 2018-01-05 | 上汽通用汽车有限公司 | Catalyst converter diagnosed system and method |
| CN108119214A (en) * | 2017-12-18 | 2018-06-05 | 潍柴动力股份有限公司 | A kind of ternary catalyzing unit fault detection method and device |
| CN108150264A (en) * | 2017-12-26 | 2018-06-12 | 潍柴动力股份有限公司 | A kind of method and device for detecting ternary catalyzing unit failure |
| CN109915268A (en) * | 2017-12-12 | 2019-06-21 | 丰田自动车株式会社 | Catalyst deterioration detecting apparatus |
| CN110284947A (en) * | 2019-06-28 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of three-way catalytic converter aging detection method and device |
| CN112177737A (en) * | 2020-09-17 | 2021-01-05 | 安徽江淮汽车集团股份有限公司 | Method and device for testing performance of three-way catalyst, terminal and storage medium |
| CN112267929A (en) * | 2020-10-16 | 2021-01-26 | 潍柴动力股份有限公司 | Method for saving precious metal consumption of three-way catalyst, tail gas treatment system and vehicle |
| CN113586214A (en) * | 2021-09-13 | 2021-11-02 | 潍柴动力股份有限公司 | Three-way catalyst monitoring method, vehicle exhaust system and vehicle |
| CN114810302A (en) * | 2022-03-17 | 2022-07-29 | 上海新动力汽车科技股份有限公司 | Anti-dismantling diagnosis method for three-way catalytic converter of fuel gas heavy truck |
| CN115126584A (en) * | 2022-07-20 | 2022-09-30 | 潍柴动力股份有限公司 | Removal detection method and device for three-way catalytic converter |
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