CN104948295B - A kind of exhaust gas by-pass valve of turbocharger - Google Patents
A kind of exhaust gas by-pass valve of turbocharger Download PDFInfo
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- CN104948295B CN104948295B CN201510270887.0A CN201510270887A CN104948295B CN 104948295 B CN104948295 B CN 104948295B CN 201510270887 A CN201510270887 A CN 201510270887A CN 104948295 B CN104948295 B CN 104948295B
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- valve
- exhaust gas
- flow channel
- spool
- bypass flow
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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
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a kind of exhaust gas by-pass valve of turbocharger, the exhaust gas by-pass valve has bypass flow channel that the air inlet of the turbine is connected with gas outlet and the spool for being turned on and off the bypass flow channel opening portion, the spool includes valve stem part and the valve plate part being connected on valve stem part, the valve stem part is axially movable, to drive valve plate part to be translated along bypass flow channel opening end surface, make valve plate part by the opening portion face opening or closing.This exhaust gas by-pass valve can improve the control accuracy in the case of each load operation of engine, strengthen the leakproofness of exhaust gas by-pass valve under high engine load.
Description
Technical field
The present invention relates to engine turbine pressure charging system, is specially a kind of exhaust gas by-pass valve for turbocharger.
Background technology
The basic function of booster exhaust gas by-pass valve, is the bypass exhaust flow for adjusting charger turbine, so as to fulfill
Control and adjusting to booster or even engine complete machine air quality flow and intake and exhaust pressure, ensure that engine health is stablized
Work；Since exhaust gas is the acting working medium of engine, exhaust gas by-pass valve further includes adjusting and starts while exhaust gas is adjusted
Machine intake and exhaust pressure is avoided exhaust gas from acting on generation on parts and makes us uncomfortable different to keep fuel economy as well as possible
Ring noise.
Referring to Fig. 1, current exhaust gas turbocharge internal combustion engine, comprising engine body 1, by compressor 2, exhaust gas
Port valve 3, turbine 4, catalyst converter 5.Wherein, turbine 4 connects engine exhaust system, absorbs high-temp waste gas energy, promotes same
The compressor 2 of axis connection, which rotates and compresses fresh air, enters engine body 1.Born for the specific target operation of engine
Lotus, the exhaust gas flow by turbine 4 is adjusted by exhaust gas by-pass valve 3, to adjust the operating power of turbine 4, and then is adjusted
The operating power of compressor 2, so as to adjust compressed air boost pressure and mass flow, finally realizes engine air system tune
Section, supports engine workload to adjust, torque power needed for output.
Referring to Fig. 2, existing exhaust gas by-pass valve 3, including positive pressure pressure actuator 33, actuator pedestal 34, actuator push away
Bar 33a, rocking arm 35, cover plate valve valve deck 32, bypass flow channel 31.Under default setting, the control of positive pressure pressure actuator 33 is passed through
Pressure is atmospheric pressure, and cover plate valve valve deck 32 closes by-passing valve runner, therefore the default setting of valve under the effect of its preload pressure
Often to close.When needing to adjust engine workload, the control pressure rise of input positive pressure pressure actuator 33, promotes and performs
Device push rod 33a, and then rocking arm 35 is promoted, rotating plate valve valve deck 32 opens exhaust gas bypass runner 31, and reduction passes through turbine 4
Exhaust gas flow, adjust turbine loads, and then adjust with the coaxially connected compressor load of turbine, and then adjust compressor 2
Compressed air require, so as to aid in realizing the regulatory function of engine air system.
Existing exhaust gas by-pass valve there are it is following the problem of：
1st, during engine cold-start, the default setting of exhaust gas by-pass valve 3 to close, engine exhaust cannot be via exhaust gas by
3 runner of port valve is discharged, and the catalyst converter in downstream can only be flowed into via turbine 4, since turbine 4 can absorb waste-gas heat, is entered
The exhaust gas temperature of catalyst converter 5 can be cooled down by turbine 4, and the medium in catalyst converter 5 cannot be rapidly heated to operating temperature and play
Catalytic action, thus engine cold-start discharge pollutants it is more；
2nd, for engine when underload works, 33 control pressure of positive pressure pressure actuator is also corresponding relatively low, is not enough to push open
Cover plate valve valve deck 32, exhaust gas cannot be discharged via by-passing valve runner 31, catalyst converter 5 can only be flowed to by turbine runner, therefore
Air flue air pressure between engine body and charger turbine 4 is higher, is unfavorable for engine and smoothly discharges exhaust gas, therefore starts
Chance additionally consumes a part of acting ability and is used to be vented, and deteriorates fuel economy；
3rd, when engine needs to adjust air mass flow, rocking arm 35 is rotated by with cover plate valve valve deck 32 in actuator 33
Angle, opens exhaust gas by-pass valve runner 31.But the angle that the effective flow area of exhaust gas bypass runner is opened with cover plate valve is not
Linear correlation.Meanwhile exhaust gas pulse is acted on the valve face of cover plate valve, it additionally can increase or reduce valve deck stroke.Due to upper
Two reasons are stated, by-passing valve is not sufficiently stable air flow control；
4th, when high engine load works, exhaust gas air pressure is higher, due to stroke directions and its exhaust gas of cover plate valve valve deck 32
Gas pressure direction is identical, and valve deck is promoted by exhaust gas, is easy to cause it and is not closed completely to exhaust gas bypass valve passage 31, reduction is started
Machine performance.Meanwhile the interruption exhaust of engine body 1 causes exhaust gas pressure dynamic fluctuation, cover plate valve valve deck 32 is easy by its effect
Shake is produced, forms abnormal sound noise.
The content of the invention
It is an object of the invention to provide a kind of exhaust gas by-pass valve of turbocharger, when accelerating cold start-up catalyst warm-up
Between, exhaust back pressure under engine low load is reduced, improves the control accuracy in the case of each load operation of engine, strengthens engine
The leakproofness of exhaust gas by-pass valve under high load capacity, reduces exhaust gas by-pass valve abnormal sound noise.
The exhaust gas by-pass valve of turbocharger of the present invention, the exhaust gas by-pass valve have by the turbine into
The bypass flow channel and the spool for being turned on and off the bypass flow channel opening portion that gas port is connected with gas outlet, the spool bag
Valve stem part and the valve plate part being connected on valve stem part are included, the valve stem part is axially movable, to drive valve plate part
Translated along bypass flow channel opening end surface, make valve plate part by the opening portion face opening or closing.
Further, the valve stem part of the spool is axially moved by driver drives.
Further, the driver forms a valve open in usual, i.e. default shape of the driver in no external drive with spool
During state, the valve plate part keeps the state for opening the bypass circulation.
Further, the driver includes return spring and the pressure chamber and plunger shaft by diaphragm segmentation, outside control
Pressing pressure is inputted in the pressure chamber, and the push rod in the plunger shaft is connected with the valve stem part of the spool, the return bullet
Spring is set on push rod, it has the trend for making the valve plate part keep opposite bypass flow channel to open.
Further, guide plate is provided with the outside of the bypass flow channel opening portion, had and opening in the middle part of the guide plate
The air passing hole of portion's face, the guide groove slided for the valve plate part along it is formed between the guide plate and opening end surface.
For existing exhaust gas by-pass valve uses Rotary spool, exhaust gas by-pass valve of the present invention is using radially
The spool open in usual of translation, has the following advantages：
1st, by-passing valve default setting is opens, and during engine cold-start, engine exhaust can get around turbine, via useless
The runner of gas by-passing valve flows into the catalyst converter in downstream, this can reduce the waste-gas heat of turbine absorption, makes into the useless of catalyst converter
Temperature degree higher, the catalytic media preheating time of the catalyst converter in cold conditions can shorten, and catalyst converter can faster reach work
Temperature, therefore can reduce and discharge pollutants.
2nd, engine, since by-passing valve can select to fully open, increases engine exhaust stream when underload works
Logical area, is conducive to engine and smoothly discharges exhaust gas, thus compared with the prior art in can not be opened under this engine condition
The design of by-passing valve, consuming acting by exhaust the invention enables engine will lack, and fuel economy is more preferable.
3rd, when engine needs to adjust air mass flow, spool moves along a straight line in guide groove, and spool is opened effectively logical
Flow area is related to its stroke linear, therefore flow control, closer to linearly, control accuracy is obviously improved with accuracy.Meanwhile
The exhaust gas pulse on valve plate part is acted on, the direction of motion of its active force and spool is mutually perpendicular to, and will not cause spool malfunction,
Therefore flow control is more stable.
4th, when high engine load works, although exhaust gas air pressure is higher, due to valve core movement direction and its suffered air pressure
Pressure direction is mutually perpendicular to, and will not produce malfunction, better tightness of the by-passing valve to exhaust gas because exhaust gas pressure acts on, it is ensured that
More waste gas flow direction turbines, improve the operating power of compressor using the energy of exhaust gas, help engine body to obtain more
More fresh airs.Meanwhile spool is spacing by guide groove structure, malfunction or shake will not be acted on by exhaust pulses, can effectively kept away
Exempt from abnormal sound noise.
Brief description of the drawings
Fig. 1 is turbocharged engine system structure schematic diagram；
Fig. 2 is the structure diagram of existing exhaust gas by-pass valve；
Fig. 3 is the structure diagram of exhaust gas by-pass valve of the present invention；
Fig. 4 is the A-A profiles of Fig. 3；
Fig. 5 is the front view of the spool.
Embodiment
The present invention is further elaborated with reference to the accompanying drawings and examples, and following embodiments are only used for explaining this
Invention, is not intended to limit the scope of the present invention..
The exhaust gas by-pass valve of turbocharger shown in Fig. 3, the exhaust gas by-pass valve have the air inlet of the turbine
Bypass flow channel 31 that mouth is connected with gas outlet, the spool 36 that is turned on and off the bypass flow channel opening portion, and control
The driver 33 of spool movement.
Referring to Fig. 5, the spool 36 includes valve stem part 36a and the valve plate part 36b being connected on valve stem part, this reality
It is rectangle plate face shape to apply valve plate part 36b in example, and certain valve plate part is alternatively polygon or circular plate face, only needs to protect
For card after spool completely closes, valve plate part 36b can block the opening portion completely.
The driver 33 uses positive pressure formula driver, it is identical with the structure and working forms of existing driver,
Such as patent CN101749104 and CN204003081 discloses associated drive structure.The driver 33 includes return bullet
The spring 33b and pressure chamber 33c split by diaphragm and plunger shaft 33d, exterior control pressure are inputted in the pressure chamber, the work
The push rod 33a of plug intracavitary is connected with the valve stem part 36b of the spool by pin 36c, and the return spring is set in push rod
On 33a.The valve stem part 36a can be driven by the push rod 33a and be moved axially, to drive valve plate part 36b along bypass flow channel
Be open end surface translation, makes valve plate part by the opening portion face opening or closing, the moving direction and bypass of valve plate part
Runner airflow direction near normal.The return spring 33b is compression spring, it has the trend for driving push rod to move up.
Therefore the driver 33 forms a valve open in usual with spool 36, i.e. the pressure chamber 33c of driver is lacked what no external drive inputted
During province's state, under the action of the return spring 33b, the valve plate part moves up, the state for keeping bypass flow channel to open.
Referring to Fig. 4, guide plate 37 is additionally provided with the outside of the bypass flow channel opening portion, is had in the middle part of the guide plate with opening
The air passing hole 37a of oral area face, forms between the guide plate and opening end surface and is led for what the valve plate part was slided along it
To groove 37b.
During above-mentioned exhaust gas by-pass valve work, under default setting, spool is in position shown in Fig. 3, and bypass flow channel 31 is kept
Unimpeded unlatching, the catalyst converter 5 of the exhaust gas of engine exhaust directly by bypass flow channel flow direction downstream.Therefore, it is seen that engine
During in cold start, the catalytic media in catalyst converter can be rapidly heated to operating temperature, play catalysis.Work as engine
In idling or low load condition without plenum when, the bypass flow channel 31 of unimpeded unlatching can help engine to keep as far as possible
Low exhaust back pressure, so as to improve fuel economy.
When engine needs more high load capacity, the control pressure for inputting the driver pressure chamber 33c raises, described in promotion
Push rod moves down, so that valve plate part 36b turns down the sectional flow area of bypass flow channel opening portion, so as to reduce by useless
The exhaust gas flow of gas by-passing valve, makes more waste gas flow direction turbines, increases turbine operating efficiency, and then increase and be coaxial therewith
Compressor work efficiency.
Claims (3)
1. a kind of exhaust gas by-pass valve of turbocharger, the exhaust gas by-pass valve has the air inlet and outlet of the turbine
The bypass flow channel that mouth is connected（31）With the spool for being turned on and off the bypass flow channel opening portion（36）, it is characterised in that：
The spool includes valve stem part（36a）With the valve plate part being connected on valve stem part（36b）, the valve stem part can
Axial movement, to drive valve plate part to be translated along bypass flow channel opening end surface, makes valve plate part open the opening end surface
Open or close；The valve stem part of the spool is by driver（33）Drive and be axially moved；The driver is normal with spool composition one
In the default setting of no external drive, the valve plate part keeps making what the bypass circulation was opened for open valve, i.e. driver
State.
2. the exhaust gas by-pass valve of turbocharger according to claim 1, it is characterised in that：The driver（33）Including
Return spring（33b）And the pressure chamber split by diaphragm（33c）And plunger shaft（33d）, the exterior control pressure input pressure
Power intracavitary, the push rod in the plunger shaft（33a）It is connected with the valve stem part of the spool, the return spring is set in push rod
On, it has the trend for making the valve plate part keep opposite bypass flow channel to open.
3. the exhaust gas by-pass valve of turbocharger according to claim 1, it is characterised in that：In the bypass flow channel opening
Guide plate is provided with the outside of portion（37）, guide plate middle part has the air passing hole with opening portion face（37a）, the guide plate with
The guide groove slided for the valve plate part along it is formed between opening end surface（37b）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510270887.0A CN104948295B (en) | 2015-05-26 | 2015-05-26 | A kind of exhaust gas by-pass valve of turbocharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510270887.0A CN104948295B (en) | 2015-05-26 | 2015-05-26 | A kind of exhaust gas by-pass valve of turbocharger |
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| Publication Number | Publication Date |
|---|---|
| CN104948295A CN104948295A (en) | 2015-09-30 |
| CN104948295B true CN104948295B (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510270887.0A Active CN104948295B (en) | 2015-05-26 | 2015-05-26 | A kind of exhaust gas by-pass valve of turbocharger |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640348B (en) * | 2015-10-28 | 2019-03-26 | 长城汽车股份有限公司 | Booster exhaust gas bypass valve arrangement and booster exhaust gas by-pass valve |
| US20200370471A1 (en) * | 2017-03-30 | 2020-11-26 | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. | Exhaust bypass device and turbocharger |
| DE102020215120B4 (en) * | 2020-12-01 | 2022-12-22 | Langlechner GmbH & Co. KG | combined heat and power plant |
| CN112682166A (en) * | 2020-12-18 | 2021-04-20 | 合肥工业大学 | Multistage control device of turbocharger |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6488259B1 (en) * | 1999-02-09 | 2002-12-03 | Mitsubishi Denki Kabushiki Kaisha | Valve device |
| CN201747485U (en) * | 2010-08-17 | 2011-02-16 | 无锡隆盛科技有限公司 | Electric EGR valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5982739B2 (en) * | 2011-06-03 | 2016-08-31 | いすゞ自動車株式会社 | Flow path switching valve, internal combustion engine, and EGR method for internal combustion engine |
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2015
- 2015-05-26 CN CN201510270887.0A patent/CN104948295B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6488259B1 (en) * | 1999-02-09 | 2002-12-03 | Mitsubishi Denki Kabushiki Kaisha | Valve device |
| CN201747485U (en) * | 2010-08-17 | 2011-02-16 | 无锡隆盛科技有限公司 | Electric EGR valve |
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| CN104948295A (en) | 2015-09-30 |
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