CN107542558A - Catalyst converter diagnosed system and method - Google Patents
Catalyst converter diagnosed system and method Download PDFInfo
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- CN107542558A CN107542558A CN201610482005.1A CN201610482005A CN107542558A CN 107542558 A CN107542558 A CN 107542558A CN 201610482005 A CN201610482005 A CN 201610482005A CN 107542558 A CN107542558 A CN 107542558A
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- catalyst converter
- oxygen sensor
- processing module
- post oxygen
- signal
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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
Abstract
The present invention relates to a kind of catalyst converter diagnosed system and method, it includes：Post oxygen sensor, it is arranged at the exhaust end downstream of catalyst converter；And processing module, it couples with post oxygen sensor.The signal using post oxygen sensor can be only needed by using the catalyst converter diagnosed system and method for the present invention, and dense dilute state of combustion mixture need not be made to change, so as to improve the control efficiency of engine and operational efficiency, reduce and discharge and reduce integral vehicle cost.
Description
Technical field
The present invention relates to vehicle catalyst converter diagnosed field, and more specifically, be related to a kind of catalyst converter diagnosed system and
Method, it diagnoses catalyst converter state using the signal of post oxygen sensor.
Background technology
Set up on vehicle and be equipped with catalyst converter as purifier, so as to will be from engine (typically petrol engine)
Various pollutants in the tail gas of discharge purge.These pollutants include but is not limited to carbon monoxide (CO), hydrocarbon
And oxynitrides (NO (Hydrocarbon)x) etc..It is known in the art that catalyst converter with use it is possible that purification
Or the decline of transformation efficiency is even failed.In the case where catalyst converter efficiency reduces or fails, the clean-up effect of Vehicular exhaust will
It is affected.Therefore, GB18352.5-2013 discharge national standard (state's V discharge standards) catalyst converter diagnosed is proposed it is tighter
The requirement of lattice.
Conventional method is to detect the state of catalyst converter, such as dioxygen sensor by detecting the oxygen storage capacity of catalyst converter
Active detecting method.Specifically, catalyst converter is connected on the exhaust pipe of engine, and the exhaust of the upstream and downstream in catalyst converter
Two lambda sensors are set respectively in pipe, also known as preceding lambda sensor and post oxygen sensor.When engine is in specific operating work
When under condition, ECU (Electronic Controller Unit, ECU) active enriching and enleanment enter in-engine
Combustion mixture.In the process, the interval of preceding lambda sensor and post oxygen sensor the measurement dense dilute state change of combustion mixture
Time.Because the measurement process needs to make dense dilute state of combustion mixture to change, therefore to the closed loop control of engine fuel
System generates detrimental effect.
It is therefore desired to design a kind of catalyst converter diagnosed system and method, it can be at least overcome in above mentioned problem
It is at least one.
The content of the invention
It is an object of the invention to provide a kind of catalyst converter diagnosed system, and it can be not provided with preceding lambda sensor.The present invention's
Purpose, which also resides in, provides a kind of catalyst converter diagnosed method.The catalyst converter diagnosed method only needs the signal using post oxygen sensor.
The purpose of the present invention is achieved by the following technical solution：
A kind of catalyst converter diagnosed system, wherein, it includes：
Post oxygen sensor, it is arranged at the exhaust end downstream of catalyst converter；And
Processing module, it couples with post oxygen sensor.
Above-mentioned catalyst converter diagnosed system, wherein, processing module is ECU or ECU.
A kind of catalyst converter diagnosed method, wherein, it comprises the following steps：
（1）Judge engine stabilizer condition and catalyst converter diagnosed condition；
（2）Processing module compartment of terrain gathers signal by post oxygen sensor；
（3）Processing module is handled the signal collected from post oxygen sensor；
（4）Processing module calculates catalyst converter oxygen storage capacity using the post oxygen sensor signal after processing；
（5）Judge diagnostic result.
Above-mentioned catalyst converter diagnosed method, wherein, processing module to gather from post oxygen sensor with 15.6ms time interval
Signal.
Above-mentioned catalyst converter diagnosed method, wherein, the magnitude of voltage of signal of the processing module to being collected from post oxygen sensor enters
Row processing.
Above-mentioned catalyst converter diagnosed method, wherein, processing module is according to following equation come to being collected from post oxygen sensor
The magnitude of voltage of post oxygen sensor signal is handled：
Wherein：
FT [N]For the high-pass filtering value of n-hour；
FT [N-1]For the high-pass filtering value at N-1 moment；
FT [N-2]For the high-pass filtering value at N-2 moment；
For the post oxygen sensor signal value of n-hour；
For the post oxygen sensor signal value at N-1 moment；
For the post oxygen sensor signal value at N-2 moment；And
Number time interval of the time difference between two adjacent moment for processing module from post oxygen sensor collection signal；
B1、B2、A3 HesA2 be filter factor.
Above-mentioned catalyst converter diagnosed method, wherein, if before the post oxygen sensor signal filter value of latter calculating cycle is less than
The filter value of one calculating cycle, then ECU will retain previous cycle post oxygen sensor signal filter value, until latter calculating cycle
Filter value is more than this value.
Above-mentioned catalyst converter diagnosed method, wherein, maximum retention time is 50 calculating cycles.
Above-mentioned catalyst converter diagnosed method, wherein, processing module calculates catalyst converter oxygen storage capacity using following equation：
Wherein,K aFor conversion coefficient.
Above-mentioned catalyst converter diagnosed method, wherein, processing module is ECU or ECU.
The beneficial effects of the present invention are：Profit can be only needed by using the catalyst converter diagnosed system and method for the present invention
The state of catalyst converter is judged with the signal of post oxygen sensor, and dense dilute state of combustion mixture need not be made to change,
So as to improve the control efficiency of engine and operational efficiency, reduce and discharge and reduce integral vehicle cost.
Brief description of the drawings
The present invention is explained in further detail for connection with figures and preferred embodiment below, but art technology
Personnel will be appreciated that these accompanying drawings are only in order at the purpose for explaining preferred embodiment and drawn, and therefore should not make
For limiting the scope of the invention.In addition, unless otherwise indicated, accompanying drawing is only intended to the group of conceptually object described by expression
Into or construct and expansiveness may have been carried out show, and accompanying drawing is also not necessarily drawn to scale.
Fig. 1 is the schematic diagram of the catalyst converter diagnosed system of prior art.
Fig. 2 is the schematic diagram of one embodiment of the catalyst converter diagnosed system of the present invention.
Fig. 3 is the flow chart of one embodiment of the catalyst converter diagnosed method of the present invention.
Embodiment
The preferred embodiments of the present invention are described in detail below with reference to accompanying drawing.Skilled artisans will appreciate that
These descriptions are only descriptive, exemplary, and should not be interpreted as limiting protection scope of the present invention.
Firstly, it is necessary to explanation, the top that is previously mentioned herein, bottom, upward, towards inferior orientation term be relative
Come what is defined, they are relative concepts in direction in each accompanying drawing, and therefore can be according at it different positions
Put and change with different practical states.So these or other orientation term should not be interpreted as restricted term.
In addition, it should be further noted that for described in the embodiments herein or implicit any single technical characteristic, or
Any single technical characteristic for being shown in the drawings or implying, it still is able to continue between these technical characteristics (or its equivalent)
It is combined, so as to obtain the other embodiment of the invention not referred to directly herein.
In addition, in different drawings, identical reference number represents same or about part.
Fig. 1 is the schematic diagram of the catalyst converter diagnosed system of prior art.Wherein, catalyst converter 10 is connected on pipeline 20, pipe
Gas in line 20 substantially moves in the direction indicated by the arrow.Lambda sensor 11 before being provided with the upstream of catalyst converter 10, and
And post oxygen sensor 12 is provided with the downstream of catalyst converter 10, preceding lambda sensor 11 and post oxygen sensor 12 are respectively coupled to handle
In module 30 (for example, ECU).Processing module 30 is configured to gather the data from preceding lambda sensor 11 and post oxygen sensor 12,
To monitor the state of catalyst converter.
Fig. 2 is the schematic diagram of one embodiment of the catalyst converter diagnosed system of the present invention.With the prior art shown in Fig. 1
Catalyst converter diagnosed system compare, which removes preceding lambda sensor 11.
Fig. 3 is the flow chart of one embodiment of the catalyst converter diagnosed method of the present invention.Wherein, processing module utilizes rear oxygen
The vibration frequency of the signal that sensor 12 measures under the different conditions of catalyst converter and amplitude calculate catalyst converter oxygen storage capacity.Tool
For body, following diagnosis algorithm is included：
（1）Judge engine stabilizer condition and catalyst converter diagnosed condition；
（2）ECU compartment of terrains gather signal by post oxygen sensor；
（3）The magnitude of voltage of signals of the ECU to being collected from post oxygen sensor is handled；
（4）ECU uses the post oxygen sensor signal of change catalyst converter oxygen storage capacity after processing；
（5）Judge diagnostic result.
Specifically, in a preferred embodiment of the invention, in step (2), ECU is with 15.6ms time interval
To gather signal from post oxygen sensor.In step (3), ECU is according to following equation come to the letter collected from post oxygen sensor
Number magnitude of voltage carry out Digital High Pass Filter：
Wherein：
FT [N]For the high-pass filtering value of n-hour；
FT [N-1]For the high-pass filtering value at N-1 moment；
FT [N-2]For the high-pass filtering value at N-2 moment；
For the post oxygen sensor signal value of n-hour；
For the post oxygen sensor signal value at N-1 moment；
For the post oxygen sensor signal value at N-2 moment；
B 1、B 2、A3 HesA2 be filter factor.
It should be noted that preferably, time difference between adjacent two moment is processing module from post oxygen sensor
Gather the time interval of signal.In other words, in above preferred embodiment, the time difference between n-hour and N-1 moment is equal to
Time interval between the time that ECU gathers signal from post oxygen sensor, for example, 15.6ms；Between N-1 moment and N-2 moment
Time difference be also equal to the time interval.And it is 0 in the high-pass filtering value of start time (namely 0 moment).
In addition, the factor for avoiding estimating is preferably included in step (3) causes shadow to the diagnostic result of catalyst converter
Loud setting.Specifically, if the post oxygen sensor signal filter value of latter calculating cycle is less than the filter of previous calculating cycle
Wave number, then ECU will retain previous cycle post oxygen sensor signal filter value, until the filter value of latter calculating cycle is more than this
Value.In a preferred embodiment, maximum retention time is 50 calculating cycles.
In step (4), ECU is integrated and changed to filtered post oxygen sensor signal, show that catalyst converter stores up oxygen
Ability valueFN [N], formula is as follows:
Wherein,KaFor conversion coefficient.
For a person skilled in the art it is easily understood thatB 1、B 2、A 3、A2 HesKA value can be according to different
Engine and the construction and parameter of gas extraction system determine, and also can by being tested, data acquisition and data processing and
The process of fitting determines.
In step (5), ECU judges the diagnostic result of catalyst converter, such as catalyst converter oxygen storage capacity is normal, then is judged to leading to
Cross；If catalyst converter oxygen storage capacity is abnormal, it is determined as that catalyst converter fails.
In a preferred embodiment of the invention, processing module 30 is ECU.However, according to being actually needed, processing of the invention
Other control modules in module 30 or vehicle, such as entire car controller or engine controller etc..The catalysis of the present invention
Device diagnostic method both realize by the software module in available processes module 30, also can be by individually or the circuit module of separation carrys out reality
It is existing.
Those skilled in the art are to be appreciated that catalyst converter diagnosed system and method for the invention only need to pass using rear oxygen
The data of sensor, therefore lambda sensor before can not being set in catalyst converter diagnosed system, so as to reduce cost.It is also possible to manage
Solution, catalyst converter diagnosed method of the invention can also be applied in existing catalyst converter diagnosed system.
Those skilled in the art will also be appreciated that above-mentioned catalyst converter diagnosed system and method are without to the flammable of engine
Blender carries out dense dilute switching, therefore the closed-loop control to engine fuel will not have an impact, so as to improve engine
Control efficiency and operational efficiency, reduce and discharge and reduce integral vehicle cost.
The present invention is disclosed with reference to the accompanying drawings in this specification, and those skilled in the art is implemented the present invention, bag
Include manufacture and using any device or system, the method from suitable material and using any combination.The scope of the present invention
Limited by claimed technical scheme, and other examples expected comprising those skilled in the art.As long as such other show
Example includes not including and request different from the structural detail of claimed technical scheme literal language, or other such examples
The literal language of the technical scheme of protection does not have the equivalent structural elements of essential distinction, then other such examples should be considered as place
In determined by claims of the present invention claimed technical scheme in protection domain.
Claims (10)
1. a kind of catalyst converter diagnosed system, it is characterised in that it includes：
Post oxygen sensor, it is arranged at the exhaust end downstream of catalyst converter；And
Processing module, it couples with the post oxygen sensor.
2. catalyst converter diagnosed system according to claim 1, it is characterised in that the processing module is ECU or automatically controlled lists
Member.
A kind of 3. catalyst converter diagnosed method, it is characterised in that it comprises the following steps：
(1) engine stabilizer condition and catalyst converter diagnosed condition are judged；
(2) processing module compartment of terrain gathers signal by post oxygen sensor；
(3) processing module is handled the signal collected from the post oxygen sensor；
(4) processing module calculates catalyst converter oxygen storage capacity using the post oxygen sensor signal after processing；
(5) diagnostic result is judged.
4. catalyst converter diagnosed method according to claim 3, it is characterised in that the processing module is with 15.6ms time
Interval to gather signal from the post oxygen sensor.
5. catalyst converter diagnosed method according to claim 3, it is characterised in that the processing module from the rear oxygen to passing
The magnitude of voltage for the signal that sensor collects is handled.
6. catalyst converter diagnosed method according to claim 3, it is characterised in that the processing module according to following equation come
The magnitude of voltage of post oxygen sensor signal to being collected from the post oxygen sensor is handled：
Wherein：
FT [N]For the high-pass filtering value of n-hour；
FT [N-1]For the high-pass filtering value at N-1 moment；
FT [N-2]For the high-pass filtering value at N-2 moment；
For the post oxygen sensor signal value of n-hour；
For the post oxygen sensor signal value at N-1 moment；
For the post oxygen sensor signal value at N-2 moment；And
Number time difference between two adjacent moment for the processing module from the post oxygen sensor gather signal when
Between be spaced；
B 1、B 2、A3 HesA2 be filter factor.
7. catalyst converter diagnosed method according to claim 6, it is characterised in that if the rear oxygen sensing of latter calculating cycle
Device signal filter value is less than the filter value of previous calculating cycle, then ECU will retain previous cycle post oxygen sensor signal filter value,
Until the filter value of latter calculating cycle is more than this value.
8. catalyst converter diagnosed method according to claim 7, it is characterised in that maximum retention time is 50 and calculates week
Phase.
9. catalyst converter diagnosed method according to claim 7, it is characterised in that the processing module is come using following equation
Calculate catalyst converter oxygen storage capacity：
Wherein,K aFor conversion coefficient.
10. the catalyst converter diagnosed method according to any one of claim 3-9, it is characterised in that the processing module is
ECU or ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610482005.1A CN107542558B (en) | 2016-06-28 | 2016-06-28 | Catalyst diagnostic system and method |
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|---|---|---|---|
| CN201610482005.1A CN107542558B (en) | 2016-06-28 | 2016-06-28 | Catalyst diagnostic system and method |
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| CN107542558A true CN107542558A (en) | 2018-01-05 |
| CN107542558B CN107542558B (en) | 2020-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879133A (en) * | 2019-11-29 | 2021-06-01 | 北京车和家信息技术有限公司 | Catalyst diagnosis method and device and vehicle |
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| US5372036A (en) * | 1993-11-22 | 1994-12-13 | Ford Motor Company | Exhaust leak detection |
| US6691020B2 (en) * | 2001-06-19 | 2004-02-10 | Ford Global Technologies, Llc | Method and system for optimizing purge of exhaust gas constituent stored in an emission control device |
| CN101832172A (en) * | 2010-04-23 | 2010-09-15 | 北京锐意泰克汽车电子有限公司 | Fault diagnosis method for three-way catalytic converter of automobile |
| CN105089746A (en) * | 2014-05-20 | 2015-11-25 | 现代自动车株式会社 | Exhaust gas processing apparatus and method |
| CN105673169A (en) * | 2016-01-27 | 2016-06-15 | 潍柴动力股份有限公司 | Method and device used for monitoring three-way catalyst in engine exhaust system |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372036A (en) * | 1993-11-22 | 1994-12-13 | Ford Motor Company | Exhaust leak detection |
| US6691020B2 (en) * | 2001-06-19 | 2004-02-10 | Ford Global Technologies, Llc | Method and system for optimizing purge of exhaust gas constituent stored in an emission control device |
| CN101832172A (en) * | 2010-04-23 | 2010-09-15 | 北京锐意泰克汽车电子有限公司 | Fault diagnosis method for three-way catalytic converter of automobile |
| CN105089746A (en) * | 2014-05-20 | 2015-11-25 | 现代自动车株式会社 | Exhaust gas processing apparatus and method |
| CN105673169A (en) * | 2016-01-27 | 2016-06-15 | 潍柴动力股份有限公司 | Method and device used for monitoring three-way catalyst in engine exhaust system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879133A (en) * | 2019-11-29 | 2021-06-01 | 北京车和家信息技术有限公司 | Catalyst diagnosis method and device and vehicle |
| CN112879133B (en) * | 2019-11-29 | 2021-11-19 | 北京车和家信息技术有限公司 | Catalyst diagnosis method and device and vehicle |
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| CN107542558B (en) | 2020-06-23 |
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