CN105736124B - A kind of diesel engine intake control device and control method - Google Patents
A kind of diesel engine intake control device and control method Download PDFInfo
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- CN105736124B CN105736124B CN201610061307.1A CN201610061307A CN105736124B CN 105736124 B CN105736124 B CN 105736124B CN 201610061307 A CN201610061307 A CN 201610061307A CN 105736124 B CN105736124 B CN 105736124B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0493—Controlling the air charge temperature
-
- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10157—Supercharged engines
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Supercharger (AREA)
Abstract
The present invention relates to technical field of engines more particularly to a kind of diesel engine intake control devices.The present invention provides a kind of diesel engine intake control device, which includes：Pass through the sequentially connected booster of air inlet pipe, charge air cooler and engine；It is provided with double-tube heat exchanger in air inlet pipe between the charge air cooler and the engine, the water inlet of the engine is connected to the water outlet of described sleeve pipe heat exchanger by water inlet pipe, the water outlet of the engine is connected to the water inlet of described sleeve pipe heat exchanger by outlet pipe, and solenoid valve is provided on the outlet pipe.Increase a double-tube heat exchanger in the air inlet pipe after charge air cooler in the diesel engine intake control device of the present invention, a water route is drawn from engine water outlet, which flows to double-tube heat exchanger.The heat that engine itself is made full use of by water route carries out heat convection to the laggard temperature degree of charge air cooler；With simple in structure and according to post-processing row's temperature need to reduce vehicle NOxThe advantages of discharge.
Description
Technical field
The present invention relates to technical field of engines, more particularly to a kind of diesel engine intake control device and control method,
Particularly a kind of simple in structure and NOxThe low diesel engine intake control device of discharge capacity and control method.
Background technology
With increasingly strict, the reduction vehicle NO of national emission regulationxDischarge is increasingly becoming the emphasis of people's research, right
For the vehicle equipped with SCR case after-treatment systems, post-processing optimum working temperature generally requires near 300 DEG C.Start
The exhaust pipe of machine is connect with SCR casees.Vehicle is in real road driving process, by road running mode and ambient temperature effect,
Average exhaust is relatively low, and the average exhaust of city class car is even less than 250 DEG C, therefore vehicle SCR post-processings system
System is relatively inaccessible to efficiency operation temperature in actual use, leads to vehicle NOxEmission level is higher.
According to engine rig test statistics indicate that：Engine Inlet Temperature often improves 1 DEG C, and delivery temperature accordingly promotes about 3
DEG C, meanwhile, engine rig test result proves：In it is cold after temperature it is smaller to fuel consumption rate influence degree, in it is cold after temperature
10 DEG C are often improved, fuel consumption rate improves about 0.5g/kWh.Vehicle in normal driving process, in it is cold after mean temperature compared with
It is low, it is appropriate to sacrifice vehicle dynamic property, economy realization reduction vehicle NO by improving intake air temperaturexThe scheme of discharge is feasible
, thus from reduce vehicle NOxDischarge angle consider, can take properly increase Engine Inlet Temperature reach promoted engine row
The purpose of temperature makes SCR system be in always within the scope of the high temperature of transformation efficiency, helps to improve the transformation efficiency of SCR system,
Realizing reduces the NO of vehiclexThe target of discharge.
In existing raising engine working process there are mainly two types of the methods of intake air temperature：One kind is using in charge air cooler
Preceding air inlet pipeline increases solenoid valve, cold by as needed according to the aperture of Engine Inlet Temperature set value calculation solenoid valve
Hot-air is introduced directly into air inlet pipe (CN201210352914.5) before device.This method is mainly used for improving the burning situation of diesel oil,
Diesel engine is improved in the combustibility of cold district, does not consider to realize that reducing vehicle discharges using promotion intake air temperature, and pass through
The aperture of solenoid valve controls final intake air temperature, it is difficult to ensure that in it is cold after temperature can reach expected control targe, the control
There is also the non-uniform deficiencies of hot and cold gas mixing for method processed.
Another kind is arranged apart with radiator by charge air cooler, and charge air cooler is controlled using independent electronic fan, root
According to the unlatching size of intake manifold temperature demand control electronic fan, the control of intake manifold temperature is realized.The main deficiency of this method exists
In：It is in certain vehicles that charge air cooler is arranged apart unrealistic with radiator by arrangement spacial influence, it cannot achieve centering
Intake air temperature directly controls after cooler.
Vehicle with SCR after-treatment devices is in use, it may appear that vehicle NOxThe very high phenomenon of discharge, causes this
Temperature required when SCR high transformation efficiencies is not achieved in the delivery temperature that phenomenon is primarily due to vehicle.As SCR low temperature is urged
The research and development of agent alleviate the problem, but since low temperature catalyst is expensive, virtually improve vehicle to a certain extent
Use cost, therefore remain difficult to fundamentally solve vehicle NO at presentxDischarge high problem.
Invention content
(1) technical problems to be solved
The technical problem to be solved by the present invention is to the methods of intake air temperature in existing raising engine working process not to examine
Consider and realize that reducing vehicle discharges using promotion intake air temperature, and control final intake air temperature by the aperture of solenoid valve, very
Cold rear temperature can reach expected control targe in being difficult to guarantee, and there is also the non-uniform deficiencies of hot and cold gas mixing.And by vehicle
Arrangement space influences, and cannot achieve to the laggard temperature degree of charge air cooler the problem of directly controlling.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of diesel engine intake control device, the diesel engine intakes
Control device includes：Pass through the sequentially connected booster of air inlet pipe, charge air cooler and engine；The charge air cooler and the engine
Between air inlet pipe on be provided with double-tube heat exchanger, the water outlet of the water inlet and described sleeve pipe heat exchanger of the engine passes through
Water inlet pipe is connected to, and the water outlet of the engine is connected to the water inlet of described sleeve pipe heat exchanger by outlet pipe, the water outlet
Solenoid valve is provided on pipe.
Preferably, further include temperature sensor and electronic control unit, the temperature sensor and the solenoid valve with it is described
Electronic control unit connects.
Preferably, the temperature sensor includes exhaust gas temperature sensor and intake air temperature sensor, the delivery temperature
Sensor is set on the exhaust pipe between the engine and SCR casees, and the intake air temperature sensor is set to the air inlet
Guan Shang.
Preferably, the temperature sensor further includes the environment temperature sensor for corresponding to engine setting.
Preferably, the inlet end of the booster is provided with air cleaner.
Preferably, the booster is turbocharger.
The present invention also provides a kind of diesel engine intake control methods, including diesel engine intake as described above control dress
It sets, which is characterized in that include the following steps：
S1, calibration temperature is preset according to the high transformation efficiency temperature range of SCR catalyst carrier attribute；
S2, the actual exhaust air temperature of exhaust gas temperature sensor detection is compared with calibration temperature：If actual exhaust air temperature
It spends not equal to calibration temperature, then the valve opening of solenoid valve is according to the two temperature difference and intake air temperature pass corresponding with delivery temperature
System, determines the target set point of intake air temperature, the target set point and intake air temperature sensor measure practical inlet air temperature value into
Row compares, and combines double-tube heat exchanger itself exchange capability of heat, calculates the branch water flow of demand, control waterway electromagnetic valve break-make and
Opening size；
S3, electronic control unit is controlled into signal according to the valve opening value output of determining solenoid valve, solenoid valve is adjusted to
Determining valve opening.
Preferably, taking a step forward for the S3 corrects valve opening, including：
S21, in advance calibration are with a series of correction factor determined by different environment temperatures；
S22, the actual temperature of environment temperature sensor detection is compared with calibration temperature：If actual temperature is equal to mark
Constant temperature degree, then revised valve opening is that the valve opening value that S3 is determined is multiplied by corresponding calibration coefficient, not equal to calibration temperature
Degree is transferred to S23；
S23, revised valve opening are two calibration that the valve opening value that S3 is determined is multiplied by that the actual temperature is fallen into
The average value of calibration coefficient corresponding to temperature.
Preferably, if the actual temperature that intake air temperature sensor measures is more than maximum calibration temperature, the solenoid valve closes
It closes.
(3) advantageous effect
The above-mentioned technical proposal of the present invention has the following advantages that：In in diesel engine intake control device provided by the invention
Double-tube heat exchanger, the water inlet of engine and the water outlet of double-tube heat exchanger are provided in air inlet pipe between cooler and engine
It is connected to by water inlet pipe, the water outlet of engine is connected to the water inlet of double-tube heat exchanger by outlet pipe, is arranged on outlet pipe
There is solenoid valve.Increase a double-tube heat exchanger in the air inlet pipe after charge air cooler in the diesel engine intake control device of the present invention,
A water route is drawn from engine water outlet, which flows to double-tube heat exchanger.Engine itself is made full use of by water route
Heat carries out heat convection to the laggard temperature degree of charge air cooler；With simple in structure and NOxThe low advantage of discharge.
Description of the drawings
Fig. 1 is the positive structure schematic of diesel engine intake control device of the embodiment of the present invention.
In figure：1, air cleaner；2, booster；3, charge air cooler；4, double-tube heat exchanger；5, solenoid valve；6, engine；7、
Water inlet pipe；8, outlet pipe.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, diesel engine intake control device provided in an embodiment of the present invention, the diesel engine intake control device packet
It includes：Pass through the sequentially connected booster 2 of air inlet pipe, charge air cooler 3 and engine 6；Between the charge air cooler 3 and the engine 6
Air inlet pipe on be provided with double-tube heat exchanger 4, the water outlet of the water inlet and described sleeve pipe heat exchanger 4 of the engine 6 passes through
Water inlet pipe 7 is connected to, and the water outlet of the engine 6 is connected to the water inlet of described sleeve pipe heat exchanger 4 by outlet pipe 8, described
Solenoid valve 5 is provided on outlet pipe 8.
The present invention increases a double-tube heat exchanger 4 in the air inlet pipe after charge air cooler 3, one is drawn from engine water outlet
Water route, the water route flow to double-tube heat exchanger 4, and a solenoid valve 5 is installed in the water route, by controlling the break-make of solenoid valve 5 and opening
Size is spent, controlling brancher water flow makes intake air temperature reach the temperature value of setting.Engine 6 itself is made full use of by water route
Heat, to after charge air cooler 3 intake air temperature carry out heat convection.It is simple in structure that the present invention need not increase additional heating device,
And intake air temperature can be accurately controlled according to vehicle SCR actual temperature demands using the technology, to promote the conversion effect of SCR system
Rate has very big help to further decreasing vehicle NOx emission.The device can also promote burning of the diesel engine in cold district simultaneously
Performance, to reduce the abrasion under diesel engine movement parts low temperature, improve diesel engine have in the economy and reliability of cold district it is huge
It is big to help.
Further include temperature sensor and electronic control unit in diesel engine intake control device provided by the invention, the temperature passes
Sensor and the solenoid valve 5 are connect with the electronic control unit (ECU), and electronic control unit receives the signal from temperature sensor,
A series of operation is carried out, aperture or the keying of solenoid valve 5 are controlled.
Temperature sensor described in the present embodiment includes exhaust gas temperature sensor and intake air temperature sensor, the exhaust temperature
Degree sensor is set on the exhaust pipe between the engine and SCR casees, the intake air temperature sensor be set to it is described into
On tracheae.According to the correspondence of the two temperature difference and intake air temperature and delivery temperature, the target set point of intake air temperature is determined,
The target set point measures practical inlet air temperature value with intake air temperature sensor and is compared, certainly in combination with double pipe heat exchanger
The heat-exchange capacity of body calculates the branch water flow of demand.By demarcating electromagnetism valve opening and water flow correspondence, water is controlled
Way solenoid valve break-make and opening size.
In order to enable aperture is more accurate, the temperature sensor in the present embodiment further includes corresponding to engine to be arranged
Environment temperature sensor.I.e. environment temperature sensor is set to aperture of the surrounding of engine for correcting solenoid valve 5.
The inlet end of booster described in the present embodiment is provided with air cleaner, and the booster is turbocharger.
In winter under cold conditions, by booster compression and absorb the waste-gas heat that is passed to by booster, fresh air
Temperature increased.
The present invention also provides a kind of diesel engine intake control methods, including diesel engine intake as described above control dress
It sets, which is characterized in that include the following steps：
S1, calibration temperature is preset according to the high transformation efficiency temperature range of SCR catalyst carrier attribute, this humidity province
Between determined completely by the physical characteristic of carrier；
S2, the actual exhaust air temperature of exhaust gas temperature sensor detection is compared with calibration temperature:If actual exhaust air temperature
The valve opening of the solenoid valve 5 on outlet pipe 8 is then arranged according to the two temperature difference and intake air temperature not equal to calibration temperature in degree
With the correspondence of delivery temperature, the target set point of intake air temperature is determined, which surveys with intake air temperature sensor
It obtains practical inlet air temperature value to be compared, and combines itself exchange capability of heat of double-tube heat exchanger 4 (if double-tube heat exchanger 4 itself changes
Thermal energy power is strong, then solenoid valve need not be opened too much, and on the contrary then solenoid valve 5 needs to open by a relatively large margin), calculate the branch of demand
Water flow controls the break-make and opening size of the solenoid valve 5 in water route；
S3, electronic control unit is controlled into signal according to the valve opening value output of determining solenoid valve 5, solenoid valve 5 is adjusted
To determining valve opening.
Preferably, taking a step forward for the S3 corrects valve opening, including：
S21, in advance calibration are with a series of correction factor determined by different environment temperatures；
S22, the actual temperature of environment temperature sensor detection is compared with calibration temperature：If actual temperature is equal to mark
Constant temperature degree, then revised valve opening is that the valve opening value that S3 is determined is multiplied by corresponding calibration coefficient, not equal to calibration temperature
Degree is transferred to S23；
S23, revised valve opening are two calibration that the valve opening value that S3 is determined is multiplied by that the actual temperature is fallen into
The average value of calibration coefficient corresponding to temperature.
If the actual temperature that intake air temperature sensor measures in the present embodiment is more than maximum calibration temperature, the solenoid valve
It closes.
Diesel engine intake control device provided in an embodiment of the present invention will be in use, the exhaust temperature sensor before SCR casees will be surveyed
Practical row's temperature and set according to 3 high transformation efficiency of charge air cooler target row temperature be compared, foundation the two temperature difference and into
The correspondence of temperature degree and delivery temperature determines the target set point of intake air temperature, which passes with intake air temperature
Sensor measures practical inlet air temperature value and is compared, and in combination with the heat-exchange capacity of itself of double pipe heat exchanger 4, calculates demand
Branch water flow.By demarcating 5 aperture of solenoid valve and water flow correspondence, controls waterway electromagnetic valve break-make and aperture is big
It is small.If the intake air temperature that intake air temperature sensor measures is more than the inlet air temperature value of engine technical requirements requirement, it is contemplated that
Excessively high intake air temperature can seriously affect vehicle dynamic property, economy, therefore when Engine Inlet Temperature is more than limit value, electromagnetism
Valve 5 is not turned on.
In conclusion the air inlet pipe between charge air cooler and engine in diesel engine intake control device provided by the invention
On be provided with double-tube heat exchanger, the water inlet of engine is connected to the water outlet of double-tube heat exchanger by water inlet pipe, engine
Water outlet is connected to the water inlet of double-tube heat exchanger by outlet pipe, and solenoid valve is provided on outlet pipe.The diesel engine of the present invention
Increase a double-tube heat exchanger in the air inlet pipe after charge air cooler in Intaker controller, a water is drawn from engine water outlet
Road, the water route flow to double-tube heat exchanger.The heat that engine itself is made full use of by water route, to the laggard temperature degree of charge air cooler into
Row heat convection；With simple in structure and NOxThe low advantage of discharge.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (8)
1. a kind of diesel engine intake control method, including diesel engine intake control device, the diesel engine intake control device
Including passing through the sequentially connected booster of air inlet pipe, charge air cooler and engine；Between the charge air cooler and the engine into
Double-tube heat exchanger is provided on tracheae, the water outlet of the water inlet and described sleeve pipe heat exchanger of the engine is connected by water inlet pipe
Logical, the water outlet of the engine is connected to the water inlet of described sleeve pipe heat exchanger by outlet pipe, is arranged on the outlet pipe
There is solenoid valve；It is characterized by comprising the following steps：
S1, calibration temperature is preset according to the high transformation efficiency temperature range of SCR catalyst carrier attribute；
S2, the actual exhaust air temperature of exhaust gas temperature sensor detection is compared with calibration temperature：If actual exhaust air temperature is not
Equal to calibration temperature, then the valve opening of solenoid valve according to both temperature difference and intake air temperature and delivery temperature correspondence,
Determine the target set point of intake air temperature, which measures practical inlet air temperature value with intake air temperature sensor is compared
Compared with, and double-tube heat exchanger itself exchange capability of heat is combined, the branch water flow of demand is calculated, waterway electromagnetic valve break-make and aperture are controlled
Size；
S3, electronic control unit is controlled into signal according to the valve opening value output of determining solenoid valve, solenoid valve is adjusted to determining
Valve opening.
2. diesel engine intake control method according to claim 1, it is characterised in that：Valve is corrected in taking a step forward for the S3
Door aperture, including：
S21, in advance calibration are with a series of correction factor determined by different environment temperatures；
S22, the actual temperature of environment temperature sensor detection is compared with calibration temperature：If actual temperature is equal to calibration temperature
Degree, then revised valve opening is that the valve opening value that S3 is determined is multiplied by corresponding calibration coefficient, is turned not equal to calibration temperature
Enter S23；
S23, revised valve opening are two calibration temperature that the valve opening value that S3 is determined is multiplied by that the actual temperature is fallen into
The average value of corresponding calibration coefficient.
3. diesel engine intake control method according to claim 1, it is characterised in that：What if intake air temperature sensor measured
Actual temperature is more than maximum calibration temperature, then the solenoid valve is closed.
4. diesel engine intake control method according to claim 1, it is characterised in that：Further include temperature sensor and automatically controlled
Unit, the temperature sensor and the solenoid valve are connect with the electronic control unit.
5. diesel engine intake control method according to claim 4, it is characterised in that：The temperature sensor includes exhaust
Temperature sensor and intake air temperature sensor, the exhaust gas temperature sensor are set to the row between the engine and SCR casees
On tracheae, the intake air temperature sensor is set in the air inlet pipe.
6. diesel engine intake control method according to claim 5, it is characterised in that：The temperature sensor further includes pair
The environment temperature sensor that should be arranged in engine.
7. diesel engine intake control method according to claim 1, it is characterised in that：The inlet end of the booster is arranged
There is air cleaner.
8. diesel engine intake control method according to claim 1, it is characterised in that：The booster is turbocharging
Device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610061307.1A CN105736124B (en) | 2016-01-28 | 2016-01-28 | A kind of diesel engine intake control device and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610061307.1A CN105736124B (en) | 2016-01-28 | 2016-01-28 | A kind of diesel engine intake control device and control method |
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| CN105736124B true CN105736124B (en) | 2018-08-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107771002B (en) * | 2016-08-15 | 2019-11-08 | 湖南中车时代电动汽车股份有限公司 | Electric machine controller cooling system and method applied to the system |
| CN106768204B (en) * | 2016-12-30 | 2019-11-01 | 潍柴动力股份有限公司 | A kind of engine intake airflow scaling method with self-learning function |
| CN108757240A (en) * | 2018-06-05 | 2018-11-06 | 潍柴动力股份有限公司 | A kind of diesel engine gas handling system and thermal management algorithm, device |
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| GB2483271A (en) * | 2010-09-02 | 2012-03-07 | Gm Global Tech Operations Inc | Oil heating and charge cooling of a turbocharged internal combustion engine |
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| CN104564440A (en) * | 2014-11-22 | 2015-04-29 | 白子榆 | Pipeline auxiliary system |
| CN104832257A (en) * | 2015-04-28 | 2015-08-12 | 潍柴动力股份有限公司 | Exhaust gas temperature control device for engine, motor vehicle and control method |
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|---|---|---|---|---|
| CN1568402A (en) * | 2001-10-09 | 2005-01-19 | 瓦特西拉芬兰有限公司 | Arrangement and method in connection with diesel engine |
| GB2483271A (en) * | 2010-09-02 | 2012-03-07 | Gm Global Tech Operations Inc | Oil heating and charge cooling of a turbocharged internal combustion engine |
| CN103410591A (en) * | 2013-07-26 | 2013-11-27 | 长城汽车股份有限公司 | Exhaust gas heat exchange system of automobile engine |
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