CN109870278A - A kind of engine crankcase gas leakage measuring device - Google Patents
A kind of engine crankcase gas leakage measuring device Download PDFInfo
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- CN109870278A CN109870278A CN201910243406.5A CN201910243406A CN109870278A CN 109870278 A CN109870278 A CN 109870278A CN 201910243406 A CN201910243406 A CN 201910243406A CN 109870278 A CN109870278 A CN 109870278A
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Abstract
The application provides a kind of engine crankcase gas leakage measuring device, comprising: oil-gas separation mechanism, the oil-gas separation mechanism are used to collect and carry out Oil-gas Separation to the gas leakage in crankcase；Pressure control device, the inlet end of the pressure control device are connected with the outlet side of oil-gas separation mechanism, and the gas for flowing out to oil-gas separation mechanism carries out pressure compensation；Pressurizer tank, the inlet end of the pressurizer tank are connected with the outlet side of the pressure control device, carry out pressure stabilizing for the gas after compensating to the pressure control device；Flowmeter, the flowmeter are used to measure the gas output of the outlet side of the pressurizer tank, improve the metric results of flowmeter, reduce the replacement frequency of flowmeter.
Description
Technical field
The present invention relates to automobile technical fields, and in particular to a kind of engine crankcase gas leakage measuring device.
Background technique
Internal combustion engine is known as crankcase by the gas flow that cylinder and piston group scurry into crankcase at work, by combustion chamber
Air leakage, the size of the crankcase blow-by amount reflect the cooperation and abrasion of piston ring and cylinder and piston ring and piston ring
Situation.
In existing scheme, usually crankcase blow-by amount is measured by the air-leakage quantity measuring instrument with flowmeter, is had
Body, the air-leakage quantity measuring instrument is measured to directlying adopt flowmeter after the gas pressure stabilizing from crankcase, still, due to
Burn the problems such as insufficient, the gas scurried into crankcase usually has some olesomes, these with olesome gas
It after body enters flowmeter, can be adhered on flowmeter, and then cause the measurement error of flowmeter, when the air-leakage quantity measuring instrument makes
After used time length reaches certain time length, in order to guarantee the reliability of measurement result, need to replace flowmeter in time, it is troublesome in poeration.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of engine crankcase gas leakage measuring device, to improve engine
The reliability of the measurement result of crankcase blow-by amount.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of engine crankcase gas leakage measuring device, comprising:
Oil-gas separation mechanism, the oil-gas separation mechanism are used to collect and carry out Oil-gas Separation to the gas leakage in crankcase；
Pressure control device, the inlet end of the pressure control device are connected with the outlet side of oil-gas separation mechanism, are used for
Pressure compensation is carried out to the gas of oil-gas separation mechanism outflow；
Pressurizer tank, the inlet end of the pressurizer tank are connected with the outlet side of the pressure control device, for the pressure
Gas after force control device compensates carries out pressure stabilizing；
Flowmeter, the flowmeter are used to measure the gas output of the outlet side of the pressurizer tank.
Preferably, in above-mentioned engine crankcase gas leakage measuring device, further includes:
First pressure sensor, for detecting the gas pressure of oil-gas separation mechanism outlet side；
Frequency converter, the frequency converter is connected with the motor of the oil-gas separation mechanism, for controlling in oil-gas separation mechanism
Motor speed；
Frequency-variable controller is sensed for obtaining the testing result of the first pressure sensor according to the first pressure
The testing result of device adjusts the motor speed of the oil-gas separation mechanism by the frequency converter.
Preferably, in above-mentioned engine crankcase gas leakage measuring device, further includes:
It is set to the residual device of putting of pressurizer tank bottom, it is described to put residual device for discharging remaining oil liquid in pressurizer tank.
Preferably, in above-mentioned engine crankcase gas leakage measuring device, described put in residual device is provided with level sensing
Device and for controlling the solenoid valve for putting residual switch for putting residual device；
The liquid level sensor is used for when the liquid level put in residual device reaches default liquid level, and Xiang Suoshu solenoid valve is defeated
Out for controlling the control signal putting residual switch and opening.
Preferably, in above-mentioned engine crankcase gas leakage measuring device, further includes:
Second pressure sensor, the second pressure sensor are used to detect the gas pressure in the pressurizer tank；
Controller, for the current working phase based on preset crankcase pressure mapping data acquisition and the engine
The actual crank case pressure matched, the compensation pressure of the pressure control device is adjusted based on the actual crank case pressure, so that
The pressure value obtained in the pressurizer tank reaches the actual crank case pressure.
Preferably, in above-mentioned engine crankcase gas leakage measuring device, the controller is also used to:
When the range of the flowmeter is in the first range, judge whether the current metered flow of the flowmeter reaches
The maximum value of first range, if so, controlling the flowmeter switches to preset second range measurement pattern, when described
When the range of flowmeter is in the second range, judge whether the current metered flow of the flowmeter is less than first range
Maximum value, if so, controlling the flowmeter switches to preset first range measurement pattern.
Based on the above-mentioned technical proposal, crankcase blow-by is measured when using above-mentioned crankcase blow-by measuring device
When, it first passes through oil-gas separation mechanism and Oil-gas Separation is carried out to the gas leakage of collected crankcase, also, use pressure control device
Pressure compensation is carried out to by the gas after Oil-gas Separation, by the gas after pressure compensation by being transferred to flow after pressurizer tank pressure stabilizing
In meter, overcurrent meter is provided and carries out flow measurement, and by the gas after measurement is put into the crankcase, it can by above scheme
See, crankcase blow-by has used oil-gas separation mechanism to carry out oil gas point before entering the flowmeter in above scheme
From, and pressure compensation has also been carried out using pressure control device, it is therefore prevented that the oil droplet in crankcase blow-by is to flowmeter
Pollution, improve the metric results of flowmeter, also, since flowmeter will not be polluted by oil droplet, service life compared with
It is long, reduce the replacement frequency of flowmeter.
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 the structural schematic diagram of crankcase blow-by measuring device disclosed in the embodiment of the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to improve the measurement accuracy of crankcase blow-by amount, the replacement frequency of flowmeter 4 is reduced, this application discloses one kind
Engine crankcase gas leakage measuring device, comprising:
Oil-gas separation mechanism 1, pressure control device 2, pressurizer tank 3 and flowmeter 4；
The oil-gas separation mechanism 1 carries out Oil-gas Separation for collecting the gas leakage from crankcase, to these gases.Removal
Oil gas particle in gas is excluded the gas after separation by the outlet side of oil-gas separation mechanism 1, to prevent crankcase
Pollution of the olesome to flowmeter 4 and other measuring devices in gas leakage, improves the precision of 4 measurement result of flowmeter；
The inlet end of the pressure control device 2 is connected with the outlet side of oil-gas separation mechanism 1, for oil gas separator
The gas that structure 1 flows out carries out pressure compensation, this is because crankcase blow-by is in the gas leakage measuring device provided by this programme
When, certain crushing can be generated, also, gas piping is more complicated, generated crushing is bigger, therefore, in order to guarantee measurement knot
The accuracy of fruit, the application can also carry out one by 2 pairs of the pressure control device gases excluded through oil-gas separation mechanism 1
Fixed pressure compensation, to compensate since gas leakage measuring device is to gas leakage bring crushing；
The inlet end of the pressurizer tank 3 is connected with the outlet side of the pressure control device 2, for controlling the pressure
Gas after device 2 compensates carries out pressure stabilizing.In the present solution, crankcase gas leakage enter the pressurizer tank 3 after, by institute
It states pressurizer tank 3 and pressure stabilizing is carried out to gas leakage, the air-flow for flowing into flowmeter 4 is more steady, so as to avoid air leakage pulsation pair
The influence of the measurement result of flowmeter 4 improves the accuracy of the metric results of flowmeter 4.Wherein, the air leakage pulsation refers to
Be the air leakage larger situation of amplitude of variation in a short time, when amplitude of variation is larger within the section time for the air leakage,
The flowmeter 4 can have reflection lag, cause metric results precision lower.
The flowmeter 4 is used to measure the gas output of the outlet side of the pressurizer tank 3, and the flowmeter 4 can be differential pressure
Formula flowmeter 4, spinner flowmeter 4, restriction flowmeter 4, slit flowmeter 4, volume-displacement 4, electromagnetic flowmeter 4, ultrasound
Wave flowmeter 4 etc..
When measuring using above-mentioned crankcase blow-by measuring device to crankcase blow-by, oil gas separator is first passed through
Structure 1 carries out Oil-gas Separation to the gas leakage of collected crankcase, also, will be after Oil-gas Separation using 2 pairs of pressure control device
Gas carries out pressure compensation, by the gas after pressure compensation by being transferred in flowmeter 4 after 3 pressure stabilizing of pressurizer tank, provides overcurrent
Meter 4 carries out flow measurement, and by the gas after measurement is put into the crankcase, by above scheme as it can be seen that above scheme
Middle crankcase blow-by has used oil-gas separation mechanism 1 to carry out Oil-gas Separation before entering the flowmeter 4, and also adopts
Pressure compensation is carried out with pressure control device 2, it is therefore prevented that pollution of the oil droplet in crankcase blow-by to flowmeter 4, mentions
The high metric results of flowmeter 4, also, since flowmeter 4 will not be polluted by oil droplet, service life is longer, reduces
The replacement frequency of flowmeter 4.
In actual work, the operating condition of engine is different for engine, and the crankcase blow-by amount that will lead to engine is different, in turn
So that the power of required oil-gas separation mechanism 1 is also just different, the function of oil-gas separation mechanism 1 if crankcase blow-by amount is excessive
Rate is too small, and will lead to the oil droplet in gas leakage can not separate completely, the function of oil-gas separation mechanism 1 if crankcase blow-by amount is too small
Rate is excessive, will lead to the power dissipation of oil-gas separation mechanism 1, in this regard, in order to enable the power of the oil-gas separation mechanism 1 can
It follows the air leakage of crankcase to change and change, in the above-mentioned measuring device of the application, can also include:
First pressure sensor 5, for detecting the gas pressure of 1 outlet side of oil-gas separation mechanism, the oil gas separator
The air leakage of the pressure follow crankcase of the outlet side of structure 1 changes and changes, and the air leakage of the crankcase is bigger, the oil gas
The gas pressure of the outlet side of separating mechanism 1 is bigger, and the output pressure of the first pressure sensor is also bigger；
Frequency converter 6, the frequency converter is connected with the motor of the oil-gas separation mechanism 1, for controlling oil-gas separation mechanism 1
In motor speed.Revolving speed of the Oil-gas Separation performance of the oil-gas separation mechanism 1 directly with the motor in oil-gas separation mechanism 1
It is positively correlated, the revolving speed of motor is faster, and the air leakage that oil-gas separation mechanism 1 can be handled is bigger, and therefore, the application can use
Frequency converter 6 controls the revolving speed of the motor in oil-gas separation mechanism 1, to realize turning for the motor in oil-gas separation mechanism 1
Speed is adjustable；
Frequency-variable controller 7 is sensed for obtaining the testing result of the first pressure sensor according to the first pressure
The testing result of device adjusts the motor speed of the oil-gas separation mechanism 1 by the frequency converter, in the present solution, the oil gas
The revolving speed of the motor of separating mechanism 1 is controlled by the frequency-variable controller 7, can be prestored in the frequency-variable controller preset
Motor speed data have in the motor speed data when getting the pressure signal of the first pressure sensor output
The motor speed to match with the pressure signal is transferred, the frequency-variable controller passes through the frequency conversion according to the motor speed
Device adjusts the revolving speed of the motor, so that the pressure signal phase that the revolving speed of the motor is exported with the first pressure sensor
Match.
The engine crankcase gas leakage measuring device in actual use, divides although can pass through the oil gas
Structure 1 of disembarking separates most of oil droplet in crankcase blow-by, and still, still suffering from a part of oil droplet, to follow gas leakage to be flowed into subsequent
Equipment in, wherein most of oil droplet in this part of oil droplet is fallen into the pressurizer tank 3, these oil droplets can be deposited at
The bottom of the pressurizer tank 3, for this purpose, in above scheme disclosed in the above embodiments of the present application, 3 bottom of pressurizer tank can be with
Be provided with one and put residual device 10, the entrained oil droplet in the pressurizer tank 3 can import it is described put in residual device 10, it is described to put residual dress
Set facility and put residual switch, when it is described put residual switch open when, the oil droplet put in residual device 10 can by it is described put it is residual
Switch excludes the pressurizer tank 3.
It is described put residual switch can for manual switch may be automatic switch, when its be manual switch mode when, use
Family can discharge the entrained oil droplet put in residual device by way of opening and closing manually, when it is is automatically switched, Ke Yitong
Cross the mode that liquid level in residual device is put described in detection, by solenoid valve automatically control described in put the folding of residual switch.Preferably,
It to be an automatic switch that residual switch is put described in disclosed in the above embodiments of the present application, and described put is provided with liquid level biography in residual device
Sensor and for controlling the solenoid valve for putting residual switch for putting residual device；The liquid level sensor is used to described put residual dress for detecting
Interior oil liquid liquid level is set, when the liquid level for putting the oil liquid in residual device reaches default liquid level (at this point, the liquid level sensor
The signal detected reaches preset value), the output of Xiang Suoshu solenoid valve is for controlling the control signal putting residual switch and opening, institute
Solenoid valve is stated when getting the control signal, residual switch is put described in control and is opened, so that putting oil liquid in residual device along institute
It states and puts the discharge of residual switch, after delay after a period of time, the solenoid valve controls again described puts residual close the switch.
In actual use, the operating condition of engine is different for the engine crankcase gas leakage measuring device, can make
The air leakage for obtaining the crankcase of engine is different, and then the pressure compensator is needed to provide different pressure compensations, therefore,
In above scheme disclosed in the above embodiments of the present application, it is additionally provided with second pressure sensor 8 and controller 9, second pressure
Force snesor 8 is used to detect the gas pressure in the pressurizer tank 3；The controller 9, for obtaining the current work of engine
Condition, based on engine current working, by the current working of preset crankcase pressure mapping data acquisition and the engine
The actual crank case pressure to match, the compensation pressure of the pressure control device 2 is adjusted based on the actual crank case pressure,
So that the pressure value in the pressurizer tank 3 reaches the actual crank case pressure, wherein the crankcase pressure maps data
In prestore mapping relations between engine operating condition and the actual crank case pressure.It can be seen that in the present embodiment, institute
The target pressure value (actual crank case pressure) that controller 9 obtains the pressurizer tank 3 based on engine operating condition is stated, the mesh is based on
Difference between mark pressure value and the output pressure of the second sensor adjusts the compensation pressure of the pressure control device 2
Size, so that the output pressure of the second sensor is identical as target pressure value, so that the outlet side of the pressurizer tank 3
Pressure be actual crank case leakage pressure.
Further, in above scheme, the variation range of the air leakage of the engine crankcase is larger, in order to guarantee to survey
The positive accuracy and reliability of result are measured, multiple ranges have can be set in flowmeter 4 described in above scheme, can flow by control
The mode of the scanning switch of meter 4 switches over flowmeter 4 between different ranges, for example, in the embodiment of the present application public affairs
In the technical solution opened, the flowmeter 4 be can be set there are two range, i.e. the first range and the second range, and described first
The measurement range of range less than the second range measurement range, at this point, the controller is also used to: when the amount of the flowmeter 4
When journey is in the first range, judge whether the current metered flow of the flowmeter 4 reaches the maximum value of first range, such as
Fruit is, by switching the scanning switch of the flowmeter 4, to control the flowmeter 4 and switch to preset second range measurement mould
Formula judges whether the current metered flow of the flowmeter 4 is less than institute when the range of the flowmeter 4 is in the second range
The maximum value of the first range is stated, if so, controlling the flowmeter 4 by the scanning switch for switching the flowmeter 4 and switching to
Preset first range measurement pattern.
Disclosed in another embodiment of the application in technical solution, the controller 9 can for vehicle secondary meter or
Person's entire car controller.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (6)
1. a kind of engine crankcase gas leakage measuring device characterized by comprising
Oil-gas separation mechanism, the oil-gas separation mechanism are used to collect and carry out Oil-gas Separation to the gas leakage in crankcase；
Pressure control device, the inlet end of the pressure control device are connected with the outlet side of oil-gas separation mechanism, for oil
The gas of gas separating mechanism outflow carries out pressure compensation；
Pressurizer tank, the inlet end of the pressurizer tank are connected with the outlet side of the pressure control device, for the pressure control
Gas after device processed compensates carries out pressure stabilizing；
Flowmeter, the flowmeter are used to measure the gas output of the outlet side of the pressurizer tank.
2. engine crankcase gas leakage measuring device according to claim 1, which is characterized in that further include:
First pressure sensor, for detecting the gas pressure of oil-gas separation mechanism outlet side；
Frequency converter, the frequency converter are connected with the motor of the oil-gas separation mechanism, for controlling the electricity in oil-gas separation mechanism
Machine revolving speed；
Frequency-variable controller, for obtaining the testing result of the first pressure sensor, according to the first pressure sensor
Testing result adjusts the motor speed of the oil-gas separation mechanism by the frequency converter.
3. engine crankcase gas leakage measuring device according to claim 1, which is characterized in that further include:
It is set to the residual device of putting of pressurizer tank bottom, it is described to put residual device for discharging remaining oil liquid in pressurizer tank.
4. engine crankcase gas leakage measuring device according to claim 3, which is characterized in that
Described put is provided with liquid level sensor and for controlling the solenoid valve for putting residual switch for putting residual device in residual device；
The liquid level sensor is used for when the liquid level put in residual device reaches default liquid level, and the output of Xiang Suoshu solenoid valve is used
The control signal that residual switch is opened is put described in the control.
5. engine crankcase gas leakage measuring device according to claim 1, which is characterized in that further include:
Second pressure sensor, the second pressure sensor are used to detect the gas pressure in the pressurizer tank；
Controller matches for the current working based on preset crankcase pressure mapping data acquisition and the engine
Actual crank case pressure adjusts the compensation pressure of the pressure control device based on the actual crank case pressure, so that institute
It states the pressure value in pressurizer tank and reaches the actual crank case pressure.
6. engine crankcase gas leakage measuring device according to claim 5, which is characterized in that the controller is also used
In:
When the range of the flowmeter is in the first range, judge whether the current metered flow of the flowmeter reaches described
The maximum value of first range, if so, controlling the flowmeter switches to preset second range measurement pattern, when the flow
When the range of meter is in the second range, judge whether the current metered flow of the flowmeter is less than the maximum of first range
Value, if so, controlling the flowmeter switches to preset first range measurement pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243406.5A CN109870278A (en) | 2019-03-28 | 2019-03-28 | A kind of engine crankcase gas leakage measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243406.5A CN109870278A (en) | 2019-03-28 | 2019-03-28 | A kind of engine crankcase gas leakage measuring device |
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| CN109870278A true CN109870278A (en) | 2019-06-11 |
Family
ID=66921404
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| CN201910243406.5A Pending CN109870278A (en) | 2019-03-28 | 2019-03-28 | A kind of engine crankcase gas leakage measuring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110320045A (en) * | 2019-07-09 | 2019-10-11 | 安徽江淮汽车集团股份有限公司 | The device and method of oil measurement are altered for engine |
| CN112051047A (en) * | 2020-09-07 | 2020-12-08 | 中国第一汽车股份有限公司 | Crankcase ventilation system carries out machine oil and measures and recovery unit |
| CN113670624A (en) * | 2021-07-30 | 2021-11-19 | 东风汽车集团股份有限公司 | Engine detection system and engine detection method |
| CN113882931A (en) * | 2021-11-10 | 2022-01-04 | 湖南道依茨动力有限公司 | Detection device of engine, engine and vehicle |
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Application publication date: 20190611 |