CN110500209A - A kind of the monitoring system and monitoring method of EGR check valve - Google Patents
A kind of the monitoring system and monitoring method of EGR check valve Download PDFInfo
- Publication number
- CN110500209A CN110500209A CN201910944166.1A CN201910944166A CN110500209A CN 110500209 A CN110500209 A CN 110500209A CN 201910944166 A CN201910944166 A CN 201910944166A CN 110500209 A CN110500209 A CN 110500209A
- Authority
- CN
- China
- Prior art keywords
- venturi tube
- egr
- check valve
- pressure passage
- measuring pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
Abstract
The present invention provides a kind of monitoring system of EGR check valve and monitoring method, which includes differential pressure pickup, the controller that is electrically connected with differential pressure pickup, and the Venturi tube being connected in exhaust gas recirculation circuit.The aditus laryngis portion outer surface of Venturi tube offers the first measuring pressure passage (144) and the second measuring pressure passage (145), first measuring pressure passage (144) is penetrated through along straight line to the entrance of Venturi tube (141), second measuring pressure passage (145) first extends along the axis direction perpendicular to Venturi tube, then the export direction to Venturi tube is turned in the position close to aditus laryngis inner surface, final perforation to the aditus laryngis section (142) of Venturi tube and the transition portion of diffuser (143).Differential pressure pickup is using passway on aditus laryngis portion outer surface of the first measuring pressure passage (144) and the second measuring pressure passage (145) as two pressure taps.The state that check valve can be effectively monitored using monitoring system provided by the invention, the check valve after avoiding damage damage engine.
Description
Technical field
The present invention relates to EGR Technology fields, more particularly to the monitoring system and monitoring of a kind of EGR check valve
Method.
Background technique
As regulation must be increasingly stringenter emission request, (Exhaust Gas Recirculation, i.e. exhaust gas are again by EGR
Circulation) as engine NO is effectively reducedxThe means of discharge are more and more widely used.It can be to engine using check valve
Oil consumption effectively promotes EGR rate under the premise of influencing less, to effectively reduce NOxDischarge amount.But the diaphragm of check valve exists
High frequency motion state is in the course of work for a long time, is easy to produce fatigue damage, the fragment formed after diaphragm fracture, which enters, to be started
Then there is very big scuffing of cylinder bore risk in machine cylinder, therefore, how effectively to monitor the state of check valve, the check valve after avoiding damage
Engine is damaged, those skilled in the art's technical problem urgently to be resolved is become.
Summary of the invention
In view of this, the present invention provides a kind of monitoring system of EGR check valve and monitoring method, using the monitoring system
The state that check valve can effectively be monitored, the check valve after avoiding damage damage engine.
In order to achieve the above object, the invention provides the following technical scheme:
A kind of monitoring system of EGR check valve, comprising:
The Venturi tube being connected in exhaust gas recirculation circuit, the entrance and the exhaust pipe of engine of the Venturi tube connect
Logical, the aditus laryngis portion outer surface of the Venturi tube offers the first measuring pressure passage and the second measuring pressure passage, and described first, which surveys pressure, leads to
Road is penetrated through along straight line to the entrance of the Venturi tube, and second measuring pressure passage is first along the axis perpendicular to the Venturi tube
Line direction extends, and then turns the export direction to the Venturi tube in the position close to aditus laryngis inner surface, final perforation to institute
State the aditus laryngis section of Venturi tube and the transition portion of diffuser；
Differential pressure pickup, the differential pressure pickup is with first measuring pressure passage and second measuring pressure passage in aditus laryngis portion
Passway on outer surface is as two pressure taps；
The controller being electrically connected with the differential pressure pickup, the controller is also and in the exhaust gas recirculation circuit
EGR valve electrical connection.
Optionally, in above-mentioned monitoring system, the Venturi tube is located at the outlet side of the EGR check valve.
It optionally, further include the cooler being connected in the exhaust gas recirculation circuit in above-mentioned monitoring system, it is described
Cooler is between the EGR check valve and the exhaust pipe of engine.
Optionally, in above-mentioned monitoring system, the EGR valve is between the Venturi tube and the EGR check valve.
It optionally, further include the pressure being set between the Venturi tube and the EGR valve in above-mentioned monitoring system
Sensor, the pressure sensor are electrically connected with the controller.
It optionally, further include the temperature being set between the EGR check valve and the EGR valve in above-mentioned monitoring system
Sensor is spent, the temperature sensor is electrically connected with the controller.
A kind of monitoring method of EGR check valve, the monitoring method use the monitoring system as disclosed in above-mentioned any one
System, the monitoring method include:
Pressure at first measuring pressure passage described in real-time measurement subtracts the difference of the pressure at second measuring pressure passage, when
When the difference is negative value and is less than preset value, the EGR valve is closed.
Optionally, in above-mentioned monitoring method, the preset value is -3hPa~0hPa.
According to the above technical scheme it is found that in the monitoring system of EGR check valve provided by the invention, exhaust gas recirculation circuit
In be provided with Venturi tube, the first measuring pressure passage and second that differential pressure pickup is opened up with the aditus laryngis portion outer surface of the Venturi tube
Measuring pressure passage is as two pressure taps.First measuring pressure passage is penetrated through along straight line to the entrance of Venturi tube, the second measuring pressure passage
First extend along the axis direction perpendicular to Venturi tube, then turns the outlet to Venturi tube in the position close to aditus laryngis inner surface
Direction, final perforation to the aditus laryngis section of Venturi tube and the transition portion of diffuser.
Since the entrance of Venturi tube is connected to the exhaust pipe of engine, so giving up when EGR check valve is in normal condition
Gas flows to diffuser by entrance, and the flow velocity of aditus laryngis section is greater than the flow velocity of entrance, and the pressure at the first measuring pressure passage subtracts the
The difference of pressure at two measuring pressure passages is positive.Assuming that reverse flow occurs in Venturi tube in exhaust gas, i.e., flowed to by diffuser
Entrance, then, since the second measuring pressure passage turns the export direction to Venturi tube, institute in the position close to aditus laryngis inner surface
It will appear stagnation in the corner of the second measuring pressure passage with exhaust gas, cause the pressure at the first measuring pressure passage to subtract the second survey pressure logical
The difference of pressure at road is negative, accordingly it is considered that exception occurs in EGR check valve.When differential pressure pickup detects above-mentioned difference
When value is negative, controller controls the EGR valve in exhaust gas recirculation circuit and closes, and the check valve after avoiding damage causes engine
It destroys.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of schematic diagram of the monitoring system of EGR check valve provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of Venturi tube 14 in Fig. 1.
In the figure, it is marked as
1, air filter；2, compressor；3, intercooler；4, throttle valve；5, EGR mixer；6, air inlet pipe；7, engine；8,
Exhaust pipe；9, worm gear machine；10, the first EGR valve；11, cooler；12, check valve；13, the second EGR valve；14, Venturi tube；
141, entrance；142, aditus laryngis section；143, diffuser；144, the first measuring pressure passage；145, the second measuring pressure passage；15, pressure difference passes
Sensor.
Specific embodiment
In order to make it easy to understand, the invention will be further described with reference to the accompanying drawing.
Referring to Fig. 1 and Fig. 2, Fig. 1 is a kind of schematic diagram of the monitoring system of EGR check valve provided in an embodiment of the present invention,
Fig. 2 is the structural schematic diagram of Venturi tube 14 in Fig. 1.
The monitoring system of EGR check valve provided in an embodiment of the present invention includes controller (not shown), Venturi tube
14 and differential pressure pickup 15, wherein Venturi tube 14 is connected in exhaust gas recirculation circuit, the entrance of Venturi tube 14 with start
The exhaust pipe 8 of machine 7 is connected to, and the aditus laryngis portion outer surface of Venturi tube 14 offers the first measuring pressure passage 144 and the second measuring pressure passage
145, the first measuring pressure passage 144 is penetrated through along straight line to the entrance 141 of Venturi tube 14, and the second measuring pressure passage 145 is first along vertical
Extend in the axis direction of Venturi tube 14, then turns the exporter to Venturi tube 14 in the position close to aditus laryngis inner surface
To final perforation to the aditus laryngis section 142 of Venturi tube 14 and the transition portion of diffuser 143.Differential pressure pickup 15 is surveyed with first
The passway of pressure passageway 144 and the second measuring pressure passage 145 on aditus laryngis portion outer surface is as two pressure taps, moreover, pressure difference passes
Sensor 15 is electrically connected with the controller, and controller is also electrically connected with the EGR valve in exhaust gas recirculation circuit.
As shown in Figure 1, fresh air is first successively by air filter 1, compressor 2, intercooler 3 and section when engine 7 works
It flows valve 4 and reaches EGR mixer 5, fresh air is flowed by air inlet pipe 6 after mixing with the exhaust gas from exhaust gas recirculation circuit and sent out
The cylinder of motivation 7, the exhaust gas a part generated after burning flow to worm gear machine 9 from exhaust pipe 8, and another part enters from exhaust pipe 8
In exhaust gas recirculation circuit.In the present embodiment, waste gas flow direction is provided with the first EGR valve 10, cooling in exhaust gas recirculation circuit
Device 11, check valve 12, the second EGR valve 13 and Venturi tube 14.
It should be noted that " EGR valve " refers to can cut off opening for exhaust gas circulation passage in exhaust gas recirculation circuit
Close valve.
As depicted in figs. 1 and 2, the diffuser 143 of Venturi tube 14 is connect with EGR mixer 5, when check valve 12 is in just
When normal state, exhaust gas flows to diffuser 143 by entrance 141, since the flow velocity of aditus laryngis section 142 is greater than the flow velocity of entrance 141,
So the difference that the pressure at the first measuring pressure passage 144 subtracts the pressure at the second measuring pressure passage 145 is positive.
Assuming that reverse flow occurs in Venturi tube 14 in exhaust gas, i.e., entrance 141 is flowed to by diffuser 143, then, by
The export direction to Venturi tube 14 is turned in the position close to aditus laryngis inner surface in the second measuring pressure passage 145, so exhaust gas exists
The corner of second measuring pressure passage 145 will appear stagnation, and the pressure at the first measuring pressure passage 144 is caused to subtract the second measuring pressure passage
The difference of pressure at 145 is negative, and accordingly it is considered that exception occurs in check valve 12, should control EGR valve closing at this time, keep away
Exempt from the fragment after check valve 12 damages and enter cylinder, achievees the purpose that protect engine 7.
It should be noted that Venturi tube 14 in addition to it is as shown in Figure 1 positioned at the outlet side of check valve 12 other than, may be used also
To be arranged in the inlet side of check valve 12.
Cooler 11 is located between check valve 12 and the exhaust pipe 8 of engine 7, and the work of check valve 12 can be made relatively low
Temperature in, protect check valve 12 not destroy because temperature is excessively high.
In specific practical application, controller can be both both electrically connected with the first EGR valve 10 and the second EGR valve 13, can also be with
Only be electrically connected with one of, for example, controller can with the second EGR valve between Venturi tube 14 and check valve 12
13 electrical connections.
In specific practical application, some pressure sensors and temperature sensor can also be arranged in monitoring system, such as Fig. 1 institute
Show, in the present embodiment, pressure sensor (unmarked in figure), the pressure are provided between Venturi tube 14 and the second EGR valve 13
Sensor is electrically connected with the controller, the temperature sensor (unmarked in figure) between check valve 12 and the second EGR valve 13, the temperature
Sensor is electrically connected with the controller.
Based on monitoring system provided by the invention, the present invention also provides a kind of monitoring method of EGR check valve, the monitorings
Method includes: the difference for the pressure that the pressure at the first measuring pressure passage of real-time measurement 144 subtracts at the second measuring pressure passage 145, when
When the difference is negative value and is less than preset value, EGR valve is closed.
In view of in actual working environment, it is possible to which there is no damages for check valve 12, but differential pressure pickup 15 is measured
Above-mentioned difference be zero near negative value, in order to avoid judging by accident as far as possible, above-mentioned " preset value " can be selected according to the actual situation,
For example, the arbitrary value within the scope of -3hPa~0hPa can be selected as preset value.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
A variety of modifications of embodiment will be readily apparent to those skilled in the art, it is as defined herein general
Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will not
It can be restricted to embodiment illustrated herein, and be to fit to consistent with the principles and novel features disclosed in this article most wide
Range.
Claims (8)
1. a kind of monitoring system of EGR check valve characterized by comprising
The Venturi tube (14) being connected in exhaust gas recirculation circuit, the entrance and the exhaust pipe of engine of the Venturi tube (14)
Connection, the aditus laryngis portion outer surface of the Venturi tube (14) offers the first measuring pressure passage (144) and the second measuring pressure passage
(145), first measuring pressure passage (144) is penetrated through along straight line to the entrance of the Venturi tube (14) (141), and described second
Measuring pressure passage (145) first extends along the axis direction perpendicular to the Venturi tube (14), then close to aditus laryngis inner surface
The export direction to the Venturi tube (14) is turned in position, the aditus laryngis section (142) of final perforation to the Venturi tube (14) with
The transition portion of diffuser (143)；
Differential pressure pickup (15), the differential pressure pickup (15) surveys to press with first measuring pressure passage (144) and described second leads to
Passway of the road (145) on aditus laryngis portion outer surface is as two pressure taps；
The controller being electrically connected with the differential pressure pickup (15), the controller is also and in the exhaust gas recirculation circuit
EGR valve electrical connection.
2. monitoring system according to claim 1, which is characterized in that it is unidirectional that the Venturi tube (14) is located at the EGR
The outlet side of valve.
3. monitoring system according to claim 2, which is characterized in that further include being connected in the exhaust gas recirculation circuit
Cooler, the cooler is between the EGR check valve and the exhaust pipe of engine.
4. monitoring system according to claim 3, which is characterized in that the EGR valve be located at the Venturi tube (14) and
Between the EGR check valve.
5. monitoring system according to claim 4, which is characterized in that further include being set to the Venturi tube (14) and institute
The pressure sensor between EGR valve is stated, the pressure sensor is electrically connected with the controller.
6. monitoring system according to claim 5, which is characterized in that further include being set to the EGR check valve and described
Temperature sensor between EGR valve, the temperature sensor are electrically connected with the controller.
7. a kind of monitoring method of EGR check valve, which is characterized in that the monitoring method is used as any in claim 1~6
Monitoring system described in one, the monitoring method include:
Pressure at first measuring pressure passage (144) described in real-time measurement subtracts the pressure at second measuring pressure passage (145)
Difference closes the EGR valve when the difference is negative value and is less than preset value.
8. monitoring method according to claim 7, which is characterized in that the preset value is -3hPa~0hPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910944166.1A CN110500209A (en) | 2019-09-30 | 2019-09-30 | A kind of the monitoring system and monitoring method of EGR check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910944166.1A CN110500209A (en) | 2019-09-30 | 2019-09-30 | A kind of the monitoring system and monitoring method of EGR check valve |
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| Publication Number | Publication Date |
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| CN110500209A true CN110500209A (en) | 2019-11-26 |
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ID=68593155
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910944166.1A Pending CN110500209A (en) | 2019-09-30 | 2019-09-30 | A kind of the monitoring system and monitoring method of EGR check valve |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120156A (en) * | 2019-12-31 | 2020-05-08 | 潍柴动力股份有限公司 | Engine EGR rate deviation fault monitoring method and device |
| CN111156114A (en) * | 2020-04-02 | 2020-05-15 | 潍柴动力股份有限公司 | One-way valve assembly |
| CN114233534A (en) * | 2021-12-23 | 2022-03-25 | 潍柴动力股份有限公司 | Method, device and system for judging failure of EGR (exhaust gas recirculation) one-way valve |
| CN114233486A (en) * | 2021-11-12 | 2022-03-25 | 潍柴动力股份有限公司 | Control method and device of EGR valve and ECU |
| CN114922750A (en) * | 2022-06-13 | 2022-08-19 | 潍柴动力股份有限公司 | Check valve detection method and device |
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| CN105043468A (en) * | 2015-05-26 | 2015-11-11 | 潍柴动力股份有限公司 | Venturi tube, EGR flow measuring system and measuring method thereof |
| CN205559110U (en) * | 2016-03-15 | 2016-09-07 | 潍柴动力股份有限公司 | Measurable exhaust gas flow's venturi |
| CN206694152U (en) * | 2017-05-02 | 2017-12-01 | 江苏海事职业技术学院 | A kind of boat diesel engine gas recirculation system |
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| CN103016214A (en) * | 2012-12-11 | 2013-04-03 | 山东绿环动力设备有限公司 | Diesel engine exhaust air recirculation system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120156A (en) * | 2019-12-31 | 2020-05-08 | 潍柴动力股份有限公司 | Engine EGR rate deviation fault monitoring method and device |
| CN111156114A (en) * | 2020-04-02 | 2020-05-15 | 潍柴动力股份有限公司 | One-way valve assembly |
| CN114233486A (en) * | 2021-11-12 | 2022-03-25 | 潍柴动力股份有限公司 | Control method and device of EGR valve and ECU |
| CN114233486B (en) * | 2021-11-12 | 2023-08-18 | 潍柴动力股份有限公司 | Control method and device for EGR valve and ECU |
| CN114233534A (en) * | 2021-12-23 | 2022-03-25 | 潍柴动力股份有限公司 | Method, device and system for judging failure of EGR (exhaust gas recirculation) one-way valve |
| CN114922750A (en) * | 2022-06-13 | 2022-08-19 | 潍柴动力股份有限公司 | Check valve detection method and device |
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Application publication date: 20191126 |
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