CN107740717A - Secondary air valve on-line monitoring system - Google Patents
Secondary air valve on-line monitoring system Download PDFInfo
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- CN107740717A CN107740717A CN201710855472.9A CN201710855472A CN107740717A CN 107740717 A CN107740717 A CN 107740717A CN 201710855472 A CN201710855472 A CN 201710855472A CN 107740717 A CN107740717 A CN 107740717A
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
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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
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention provides a kind of secondary air valve on-line monitoring system, including：Engine, secondary air control valve, secondary air valve, secondary air pump, blast pipe, linear oxygen sensors, control module, air induction system on-line monitoring module, wherein, in the case where meeting preparatory condition, air induction system monitors module on-line and determines actual secondary air flow based on the data that linear oxygen sensors and control module are gathered, and the theoretical secondary air flow of prediction is determined based on presetting method, is realized by difference between actual secondary air flow and the theoretical secondary air flow of prediction and the sealing of secondary air valve is monitored.The secondary air valve on-line monitoring system of the present invention can obtain reliable and stable diagnostic result, so as to meet laws and regulations requirement.
Description
Technical field
The present invention relates to a kind of secondary air valve on-line monitoring system, and in particular to a kind of gasoline car secondary air valve is online
Monitoring system, the gasoline engine vehicle suitable for installing air induction system, the present invention are applied particularly to automotive electronics emission control
Technical field.
Background technology
Secondary air supply is one of evolution device outside the machine for reduce exhaust emissions, and it is by blowing into volume into waste gas
Outer air, increase wherein oxygen content.After the high temperature combustible gases discharged with engine during idling mix, in blast pipe again
Secondary oxidation, carbon monoxide (CO) and hydrocarbon (HC) is set to burn again in high temperature environments.Secondary air supply
Worked in vehicle cold start, there is this device hazardous emission and heating ternary catalyzing unit when reducing cold start-up to make its rapid
Have the function that normal working temperature, so as to meet requirement of the regulation to discharge.
Because working environment is severe, therefore the parts for being easiest to break down in air induction system are auxiliary airs
Valve.Secondary air valve belongs to mechanical valve, phenomena such as carbon distribution gets rusty easily occurs, this may result in auxiliary air valve element and base
It can not keep sealing, influence auxiliary air control accuracy, so as to can not effectively reduce discharge.Therefore can promptly and accurately detect
Can the leakage of valve for meet that laws and regulations requirement becomes extremely important.
Patent CN201210566877.8 (notification numbers：CN103573360A, the day for announcing：2014.02.12 one kind) is disclosed
Vehicle with the system and method diagnosed to secondary air injection system.Pass through oxygen sensor signal and pressure sensor
Signal is monitored to secondary air injection system, by pressure sensor monitoring charge flow rate, and it is empty in cylinder by comparing
Combustion determines whether there is failure than being compared with the air-fuel ratio that lambda sensor measures.If however, sensed using two point form oxygen
Device, the then air fuel ratio signal obtained only show dense dilute state, due to causing signal inaccurate for non-quantized value；And even with line
Property lambda sensor, because air fuel ratio signal momentary fluctuation is big, can not also ensure to obtain stable result.
It would therefore be highly desirable to need one kind that there is anti-jamming effectiveness, the diagnosis scheme of reliable and stable diagnostic result can be obtained.
The content of the invention
The example technical problems to be solved of the present invention are to provide a kind of reliable and stable diagnostic result of acquisition, so as to meet
The secondary air valve on-line monitoring system of laws and regulations requirement.
The technical solution adopted by the present invention is：
The embodiment of the present invention provides a kind of secondary air valve on-line monitoring system, including：Engine, auxiliary air control
Valve, secondary air valve, secondary air pump, blast pipe, linear oxygen sensors, control module, air induction system on-line monitoring mould
Block, the blast pipe are connected with the engine, and the secondary air valve connects with secondary air pump, and are connected with the blast pipe
Logical, the secondary air control valve is connected with the secondary air valve, and the linear oxygen sensors are arranged on the blast pipe,
The air induction system on-line monitoring module controls the operation of the secondary air control valve and the secondary air pump, described
Control module and air induction system on-line monitoring module communication connection, wherein, it is described secondary in the case where meeting preparatory condition
Air assembly monitors module on-line and determines reality based on the data that the linear oxygen sensors and the control module are gathered
Secondary air flow, and the theoretical secondary air flow for determining to predict based on presetting method, pass through actual secondary sky
Difference is realized between throughput and the theoretical secondary air flow of prediction monitors to the sealing of the secondary air valve.
Alternatively, the preparatory condition specifically includes：In addition to secondary air pump, secondary air valve, secondary air control valve
Associated components fault-free；Engine temperature difference is more than 10 DEG C when temperature starts with this when last engine is shut down；Hair
Motivation intake air temperature scope is within 5~50 DEG C；Engine temperature is within 30~110 DEG C；Secondary air pump coil temperature is low
In 100 DEG C；Speed is 0；Current environment pressure and normal pressure ratio are more than 0.75；λ controlling elements average value deviation theory values
Scope is within ± 0.1.
Alternatively, in the case where meeting preparatory condition, the air induction system on-line monitoring module is based on the linear oxygen and passed
The data that sensor and the control module are gathered determine actual secondary air flow, and determine prediction based on presetting method
Theoretical secondary air flow, pass through difference between actual secondary air flow and the theoretical secondary air flow of prediction
Realize that the sealing monitoring to the secondary air valve specifically includes：Described in the air induction system on-line monitoring module is closed
Secondary air valve, while open the secondary air pump；The air induction system monitors module on-line from the control module
Place obtains engine intake airflow, excess air coefficient collection value, in cylinder excess air coefficient and λ closed-loop controls because
Sub- average determines the actual secondary air flow；The excess air coefficient collection value is the linear oxygen sensors institute
The value of collection is simultaneously sent to the control module, excess air coefficient and λ closed-loop control factor averages in the cylinder
The engine condition information that is obtained by the control module is calculated；Based on the actual secondary air flow and institute
State the deviation that λ closed-loop control factor mean bias determines the charge flow rate；According to the electric power storage that power supply is provided to secondary air pump
The characteristic curve of pond electricity and auxiliary air theoretical delivery determines preliminary theory flow, and identified preliminary theory flow is entered
Row amendment, to obtain the theoretical secondary air flow of the prediction；Based on the actual secondary air flow, the inlet air flow
The deviation of amount and the theoretical secondary air flow determine auxiliary air relative discharge；By identified auxiliary air relative discharge
Compared with default auxiliary air relative discharge threshold value, the sealing of the secondary air valve is determined based on comparative result.
Alternatively, the actual secondary air flow is determined by following formula (1):
Wherein, MSAIFor the secondary air flow of reality, MINKFor engine intake airflow, λO2Gathered for linear oxygen sensors
Excess air coefficient collection value, λCYLFor excess air coefficient in the cylinder of calculating, fλFor the λ closed-loop controls of calculating
Factor average.
Alternatively, the deviation of the charge flow rate is determined by following formula (2)：
ΔMINK=MINK×Δfλ (2)
Wherein, Δ MINKFor the deviation of charge flow rate, Δ fλFor λ closed-loop control factor mean bias.
Alternatively, the λ closed-loop controls factor mean bias is determined as follows：
The deviation between the λ closed-loop controls factor average and theoretical value is calculated, and to the deviation delta f of calculatingλCarry out low
Pass filter, so as to obtain the λ closed-loop controls factor mean bias.
Alternatively, the auxiliary air relative discharge is determined by following formula (3)：
Wherein, RSAIFor auxiliary air relative discharge, MSAIFor the secondary air flow of reality, MSAITFor the theory two of prediction
Secondary air mass flow, Δ MINKFor the deviation of charge flow rate.
Alternatively, it is described that identified preliminary theory flow is modified, to obtain the theoretical secondary sky of the prediction
Throughput specifically includes：Identified preliminary theory flow is multiplied by modifying factor to obtain the theoretical auxiliary air of the prediction
Flow；The modifying factor is the business of current environment pressure and standard atmospheric pressure.
Alternatively, identified auxiliary air relative discharge and default auxiliary air relative discharge threshold value are compared
Compared with the sealing for determining the secondary air valve based on comparative result includes：
If identified auxiliary air relative discharge exceedes the default auxiliary air relative discharge threshold value, then it represents that
The sealing of the secondary air valve is not tight.
Compared with prior art, secondary air valve on-line monitoring system provided in an embodiment of the present invention is based on the original oxygen of system
Sensor calculates actual secondary air flow and the theoretical secondary air flow of model prediction, and two are realized by comparing both differences
The sealing monitoring of secondary air valve, by λ closed-loop control factor mean value computation secondary air flows, by secondary air flow come
The method for monitoring secondary air valve leakage, has anti-jamming effectiveness, can obtain reliable and stable diagnostic result, disclosure satisfy that regulation
It is required that.
Brief description of the drawings
Fig. 1 is the structural representation of secondary air valve on-line monitoring system provided in an embodiment of the present invention；
Fig. 2 is the monitoring method schematic flow sheet of secondary air valve on-line monitoring system provided in an embodiment of the present invention；
Fig. 3 is the graph of a relation of maximum secondary air relative discharge threshold value and excess air coefficient.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
Fig. 1 is the structural representation of secondary air valve on-line monitoring system provided in an embodiment of the present invention；Fig. 2 is the present invention
The monitoring method schematic flow sheet for the secondary air valve on-line monitoring system that embodiment provides；Fig. 3 is that maximum secondary air is relative
The graph of a relation of flow threshold and air-fuel ratio.
As shown in figure 1, the embodiment of the present invention provides a kind of secondary air valve on-line monitoring system, including：Engine 1, two
Secondary air control valve 2, secondary air valve 3, secondary air pump 4, blast pipe 5, linear oxygen sensors 6, control module 9, secondary sky
Device of air monitors module 10 on-line, and the blast pipe 5 is connected with the engine 1, the secondary air valve 3 and secondary air pump
4 connections, and connected with the blast pipe 5, the secondary air control valve 2 is connected with the secondary air valve 3, the linear oxygen
Sensor 6 is arranged on the blast pipe 5, and the air induction system on-line monitoring module 10 controls the auxiliary air to control
The operation of valve 2 and the secondary air pump 4, the control module 9 and air induction system on-line monitoring module 10 communicate
Connection, control module 9 is mainly responsible for engine ignition, oil spout, air inlet, the control of moment of torsion, so that engine normal operation.Its
In, in the case where meeting preparatory condition, air induction system on-line monitoring module 10 is based on linear oxygen sensors 6 and described
The data that control module 9 is gathered determine actual secondary air flow and determine the theoretical secondary of prediction based on presetting method
Air mass flow, realized by difference between actual secondary air flow and the theoretical secondary air flow of prediction to described
The sealing monitoring of secondary air valve, specific availability data acquisition channel 7 and control module communication port 11 monitor secondary sky
The sealing of air valve 3, specifically, it can be obtained by data acquisition channel 7 or control module communication port 11 at control module 9
Status information on engine 1 etc. is taken, by running the monitoring algorithm of related software so that judge whether can be to auxiliary air
Valve is monitored.As shown in figure 1, air induction system monitor on-line module 10 by wire harness respectively with secondary air control valve 2
Connected with secondary air pump 4, the opening and closing of secondary air control valve 2 and secondary air pump 4 behaviour is controlled in setting time
Make.In the present invention, the associated components of secondary air valve on-line monitoring system are all prior art, therefore, to avoid repeating, this
The specific introduction to them is omitted in invention.
Specifically, the preparatory condition in the present invention may include following condition：
(1) the associated components fault-free in addition to air induction system；
(2) engine temperature difference is more than 10 DEG C when temperature starts with this when last engine is shut down；
(3) intake air temperature scope is within 5~50 DEG C；
(4) engine temperature is within 30~110 DEG C；
(5) secondary air pump coil temperature should be less than 100 DEG C；
(6) speed is 0；
(7) current environment pressure and normal pressure ratio should be greater than 0.75；
(8) for λ controlling elements average value deviation theory value scope within ± 0.1, the representative value of general theory value is 1.
Above-mentioned preparatory condition can be obtained by data acquisition channel 7 or by control module communication port 11 from control mould
Obtained at block 9, after above-mentioned condition is satisfied simultaneously, air induction system on-line monitoring module 10 can be after preset time be postponed
Start to be monitored the sealing of secondary air valve 3, general preset time is 1 second or so.
Specifically, as shown in Fig. 2 meeting at the same time under above-mentioned preparatory condition, the air induction system monitors mould on-line
The data that block is gathered based on the linear oxygen sensors 6 and the control module 9 determine actual secondary air flow and
The theoretical secondary air flow of prediction is determined based on presetting method, passes through actual secondary air flow and the theory of prediction
Difference realizes that the sealing monitoring to the secondary air valve specifically may include following steps between secondary air flow：
S101, air induction system on-line monitoring module are closed the secondary air valve, while opened described secondary
Air pump.
S102, the air induction system on-line monitoring module obtained at the control module engine intake airflow,
Excess air coefficient and λ closed-loop control factor averages determine the reality in excess air coefficient collection value, cylinder
Secondary air flow；
In this step, linear oxygen sensors 6 are based primarily upon to determine the secondary air flow of reality.The excess air
Coefficient collection value is by value that the linear oxygen sensors gather and is sent to the control module, mistake in the cylinder
Amount air coefficient and the engine condition information that is obtained by the control module of λ closed-loop control factor averages are calculated,
The related software that can be specifically carried by control module 9 carries out computing and obtained.Specifically, air induction system on-line monitoring module
10 by data acquisition channel 7, i.e., single-chip microcomputer hardware A/D passages and data acquisition control passage 8 be single-chip microcomputer hardware driving and
A/D passages obtain λ signals, charge flow rate signal and λ closed-loop control factor mean value signals at control module 9, wherein, it is described
Actual secondary air flow can be determined by following formula (1):
Wherein, MSAIFor the secondary air flow of reality, MINKFor engine intake airflow, λO2Gathered for linear oxygen sensors
Excess air coefficient collection value, λCYLFor excess air coefficient in the cylinder of calculating, fλFor the λ closed-loop controls of calculating
Factor average, for correcting the dense dilute state of engine mixed gas.
S103, based on the actual secondary air flow and the λ closed-loop controls factor mean bias determine described in enter
The deviation of throughput.
In this step, the deviation of the charge flow rate is determined by following formula (2)：
ΔMINK=MINK×Δfλ (2)
Wherein, Δ MINKFor the deviation of charge flow rate, Δ fλFor λ closed-loop control factor mean bias.
Wherein, the λ closed-loop controls factor mean bias can be determined as follows：
The deviation between the λ closed-loop controls factor average and theoretical value is calculated, and to the deviation delta f of calculatingλCarry out low
Pass filter (filter time constant representative value：100 milliseconds), so as to obtain the λ closed-loop controls factor mean bias.
S104, according to secondary air pump provide power supply accumulator electric-quantity and auxiliary air theoretical delivery characteristic curve
Preliminary theory flow is determined, and identified preliminary theory flow is modified, to obtain the theoretical secondary sky of the prediction
Throughput.
In this step, the characteristic curve of auxiliary air theoretical delivery is provided by supplier, is accumulator electric-quantity and secondary
The fixed correspondence of air preliminary theory flow, corresponding secondary preliminary theory flow can be found according to accumulator electric-quantity.Examine
The influence of exhaust back pressure and atmospheric density is considered, it is necessary to be modified to identified preliminary theory flow, it is described so as to obtain
The theoretical secondary air flow of prediction, is specifically included：It is described to obtain that identified preliminary theory flow is multiplied by into modifying factor
The theoretical secondary air flow of prediction；The modifying factor is the business of current environment pressure and standard atmospheric pressure.
S105, based on the actual secondary air flow, the deviation of the charge flow rate and the theoretical auxiliary air
Flow determines auxiliary air relative discharge.
In this step, auxiliary air relative discharge can be determined by following formula (3)：
Wherein, RSAIFor auxiliary air relative discharge, MSAIFor the secondary air flow of reality, MSAITFor the theory two of prediction
Secondary air mass flow, Δ MINKFor the deviation of charge flow rate.
S106, by identified auxiliary air relative discharge compared with default auxiliary air relative discharge threshold value,
The sealing of the secondary air valve is determined based on comparative result.
In this step, if identified auxiliary air relative discharge exceedes the default auxiliary air relative discharge
Threshold value, then it represents that the sealing of the secondary air valve is not tight, gas leak phenomenon be present, wherein auxiliary air relative discharge threshold value and
Excess air coefficient is relevant, and as shown in Figure 3, the physical relationship can be provided physical relationship by supplier.
To sum up, the present invention need not increase any cost, and actual secondary air flow is calculated based on the original lambda sensor of system
With the theoretical secondary air flow of model prediction, realize that the sealing of secondary air valve monitors by comparing both differences, pass through
Closed-loop control factor mean value computation secondary air flow, the method that secondary air valve is revealed is monitored by secondary air flow,
With anti-jamming effectiveness, reliable and stable diagnostic result can be obtained, disclosure satisfy that laws and regulations requirement.
Embodiment described above, it is only the embodiment of the present invention, to illustrate technical scheme, rather than
It is limited, protection scope of the present invention is not limited thereto, although having been carried out in detail to the present invention with reference to the foregoing embodiments
Illustrate, it will be understood by those within the art that：Any one skilled in the art the invention discloses
In technical scope, it can still modify to the technical scheme described in previous embodiment or can readily occur in change, or
Person carries out equivalent substitution to which part technical characteristic；And these modifications, change or replacement, do not make appropriate technical solution
Essence departs from the spirit and scope of technical scheme of the embodiment of the present invention, should all be included within the scope of the present invention.Therefore,
Protection scope of the present invention described should be defined by scope of the claims.
Claims (9)
- A kind of 1. secondary air valve on-line monitoring system, it is characterised in that including：Engine, secondary air control valve, secondary sky Air valve, secondary air pump, blast pipe, linear oxygen sensors, control module, air induction system on-line monitoring module, the row Tracheae is connected with the engine, and the secondary air valve connects with secondary air pump, and is connected with the blast pipe, and described two Secondary air control valve is connected with the secondary air valve, and the linear oxygen sensors are arranged on the blast pipe, described secondary Air assembly on-line monitoring module controls the operation of the secondary air control valve and the secondary air pump, the control module Communicated to connect with air induction system on-line monitoring module,Wherein, in the case where meeting preparatory condition, air induction system on-line monitoring module be based on the linear oxygen sensors and The data that the control module is gathered determine actual secondary air flow, and the theory of prediction is determined based on presetting method Secondary air flow, pass through difference realization pair between actual secondary air flow and the theoretical secondary air flow of prediction The sealing monitoring of the secondary air valve.
- 2. secondary air valve on-line monitoring system according to claim 1, it is characterised in that the preparatory condition is specifically wrapped Include：Associated components fault-free in addition to secondary air pump, secondary air valve, secondary air control valve；Last engine is shut down Engine temperature difference is more than 10 DEG C when Shi Wendu and this starting；Engine Inlet Temperature scope is within 5~50 DEG C；Start Machine temperature is within 30~110 DEG C；Secondary air pump coil temperature is less than 100 DEG C；Speed is 0；Current environment pressure and standard Pressure ratio is more than 0.75；λ controlling elements average value deviation theory value scopes are within ± 0.1.
- 3. secondary air valve on-line monitoring system according to claim 1 or 2, it is characterised in that meeting preparatory condition Under, data and the control module that the air induction system on-line monitoring module is gathered based on the linear oxygen sensors Related data determines actual secondary air flow, and the theoretical secondary air flow of prediction is determined based on presetting method, leads to Difference between actual secondary air flow and the theoretical secondary air flow of prediction is crossed to realize to the secondary air valve Sealing monitoring, specifically include：The air induction system on-line monitoring module closes the secondary air valve, while opens the secondary air pump；The air induction system on-line monitoring module obtains engine intake airflow, excess air system at the control module Number collection values, excess air coefficient and λ closed-loop control factor averages determine the actual auxiliary air in cylinder Flow；The excess air coefficient collection value is by value that the linear oxygen sensors gather and is sent to the control module, The engine shape that excess air coefficient and λ closed-loop control factor averages are obtained by the control module in the cylinder State information and be calculated；The inclined of the charge flow rate is determined based on the actual secondary air flow and the λ closed-loop controls factor mean bias Difference；Determined according to the characteristic curve of accumulator electric-quantity and auxiliary air theoretical delivery that power supply is provided to secondary air pump preliminary Theoretical delivery, and identified preliminary theory flow is modified, to obtain the theoretical secondary air flow of the prediction；Two are determined based on the actual secondary air flow, the deviation of the charge flow rate and the theoretical secondary air flow Secondary air relative discharge；By identified auxiliary air relative discharge compared with default auxiliary air relative discharge threshold value, tied based on comparing Fruit determines the sealing of the secondary air valve.
- 4. secondary air valve on-line monitoring system according to claim 3, it is characterised in that the actual auxiliary air Flow is determined by following formula (1):<mrow> <msub> <mi>M</mi> <mrow> <mi>S</mi> <mi>A</mi> <mi>I</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>M</mi> <mrow> <mi>I</mi> <mi>N</mi> <mi>T</mi> <mi>K</mi> </mrow> </msub> <mrow> <mo>(</mo> <mfrac> <msub> <mi>&lambda;</mi> <mrow> <mi>O</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>&lambda;</mi> <mrow> <mi>C</mi> <mi>Y</mi> <mi>L</mi> </mrow> </msub> </mfrac> <mo>&times;</mo> <msub> <mi>f</mi> <mi>&lambda;</mi> </msub> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>Wherein, MSAIFor the secondary air flow of reality, MINKFor engine intake airflow, λO2For the mistake of linear oxygen sensors collection Measure air coefficient collection value, λCYLFor excess air coefficient in the cylinder of calculating, fλFor the λ closed-loop control factors of calculating Average.
- 5. secondary air valve on-line monitoring system according to claim 3, it is characterised in that the deviation of the charge flow rate Determined by following formula (2)：ΔMINK=MINK×Δfλ (2)Wherein, Δ MINKFor the deviation of charge flow rate, Δ fλFor λ closed-loop control factor mean bias.
- 6. secondary air valve on-line monitoring system according to claim 5, it is characterised in that the λ closed-loop controls factor Mean bias is determined as follows：The deviation between the λ closed-loop controls factor average and theoretical value is calculated, and to the deviation delta f of calculatingλCarry out low pass filtered Ripple, so as to obtain the λ closed-loop controls factor mean bias.
- 7. secondary air valve on-line monitoring system according to claim 3, it is characterised in that the auxiliary air is relative to flow Amount is determined by following formula (3)：<mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mi>A</mi> <mi>I</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>M</mi> <mrow> <mi>S</mi> <mi>A</mi> <mi>I</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>&Delta;M</mi> <mrow> <mi>I</mi> <mi>N</mi> <mi>K</mi> </mrow> </msub> </mrow> <msub> <mi>M</mi> <mrow> <mi>S</mi> <mi>A</mi> <mi>I</mi> <mi>T</mi> </mrow> </msub> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>Wherein, RSAIFor auxiliary air relative discharge, MSAIFor the secondary air flow of reality, MSAITFor the theoretical secondary sky of prediction Throughput, Δ MINKFor the deviation of charge flow rate.
- 8. secondary air valve on-line monitoring system according to claim 3, it is characterised in that described to identified preliminary Theoretical delivery is modified, and to obtain the theoretical secondary air flow of the prediction, is specifically included：By identified preliminary theory Flow is multiplied by modifying factor to obtain the theoretical secondary air flow of the prediction；The modifying factor be current environment pressure with The business of standard atmospheric pressure.
- 9. secondary air valve on-line monitoring system according to claim 3, it is characterised in that by identified auxiliary air Relative discharge determines the secondary air valve compared with default auxiliary air relative discharge threshold value, based on comparative result Sealing includes：If identified auxiliary air relative discharge exceedes the default auxiliary air relative discharge threshold value, then it represents that described The sealing of secondary air valve is not tight.
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| CN201710855472.9A CN107740717B (en) | 2017-09-20 | 2017-09-20 | Secondary air valve on-line monitoring system |
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| CN201710855472.9A CN107740717B (en) | 2017-09-20 | 2017-09-20 | Secondary air valve on-line monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187592A (en) * | 2021-06-09 | 2021-07-30 | 中国第一汽车股份有限公司 | Secondary air system monitoring method, device, equipment and storage medium |
| CN113847118A (en) * | 2021-09-10 | 2021-12-28 | 浙江吉利控股集团有限公司 | System and method for actively sounding exhaust silencer assembly |
| CN115217597A (en) * | 2022-02-16 | 2022-10-21 | 长城汽车股份有限公司 | Secondary air control valve fault diagnosis method, device and system and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113187592A (en) * | 2021-06-09 | 2021-07-30 | 中国第一汽车股份有限公司 | Secondary air system monitoring method, device, equipment and storage medium |
| CN113187592B (en) * | 2021-06-09 | 2023-03-14 | 中国第一汽车股份有限公司 | Secondary air system monitoring method, device, equipment and storage medium |
| CN113847118A (en) * | 2021-09-10 | 2021-12-28 | 浙江吉利控股集团有限公司 | System and method for actively sounding exhaust silencer assembly |
| CN115217597A (en) * | 2022-02-16 | 2022-10-21 | 长城汽车股份有限公司 | Secondary air control valve fault diagnosis method, device and system and vehicle |
| CN115217597B (en) * | 2022-02-16 | 2023-11-24 | 长城汽车股份有限公司 | Secondary air control valve fault diagnosis method, device and system and vehicle |
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|---|---|
| CN107740717B (en) | 2020-01-24 |
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