CN208456720U - A kind of GDI engine natural gas-gasoline double-fuel electric-control system - Google Patents
A kind of GDI engine natural gas-gasoline double-fuel electric-control system Download PDFInfo
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- CN208456720U CN208456720U CN201820909867.2U CN201820909867U CN208456720U CN 208456720 U CN208456720 U CN 208456720U CN 201820909867 U CN201820909867 U CN 201820909867U CN 208456720 U CN208456720 U CN 208456720U
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- natural gas
- gas
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- 239000000446 fuel Substances 0.000 title claims abstract description 32
- 239000003502 gasoline Substances 0.000 title claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims abstract description 41
- 239000003345 natural gas Substances 0.000 claims abstract description 40
- 238000006467 substitution reaction Methods 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 230000008450 motivation Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 abstract description 4
- 230000003313 weakening effect Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The utility model discloses a kind of GDI engine natural gas-gasoline double-fuel electric-control system, the gas outlet of natural gas tank passes sequentially through pressure-reducing chamber and gas injector is connected to mixing chamber, mixing chamber side is equipped with air inlet pipe, and the other side is connected to the air inlet of engine body by inlet manifold；Air cleaner, air inlet pressure sensor, air flow meter and electronic throttle are successively arranged in air inlet pipe starting from the inlet；The output shaft of engine body is connected to flywheel, and flywheel side is equipped with speed probe；Additional electronic control unit receives the signal of the E-Gas of original machine, air flow meter, electronic throttle, speed probe and gas injector, and the operating condition according to locating for engine calculates the substitution rate of natural gas, and communicated by CAN line with original machine ECU.The utility model realizes that double fuel flexibly steadily controls at low cost, has not only guaranteed the reliability of fuel injector after introducing natural gas, but also the power of engine can be made not decline too much.
Description
Technical field
The utility model relates to technical field of automobile engine, specially a kind of GDI engine natural gas-gasoline double-fuel
Electric-control system.
Background technique
With developing and utilizing clean alternative energy source to the lasting rising of energy demand and getting worse for environmental degradation
It is imperative.Natural gas is as a kind of clean alternative energy source and rich reserves are widely paid close attention to.Natural gas it is main at
Dividing is that methane compares natural gas low heat value height with gasoline, and anti-knock properties are good, and since it is that gaseous state is easier uniformly to mix with air
It closes.However, the flame propagation velocity of natural gas is lower than gasoline, this increases mean temperature, cause body and
The thermic load of GDIGasoline Direct Injection gasoline direct injection engine fuel injector increases, power sharp fall and
Discharge is deteriorated.Therefore, how to optimize the ignition timing of natural gas-gasoline dual fuel engine and substitution ratio of NG is allowed to more
High-efficiency cleaning, while realizing smooth transition when dual fuel mode switching and guaranteeing that the reliability of GDI engine fuel injector is
This field urgent problem to be solved.
The natural gas engine that gasoline engine is changed to by Patent No. CN104806352 A has been simply added into a set of natural gas
Air supply system does not account for the best substitution ratio of NG under each operating condition after modified, performance and economy is caused to be deteriorated.
Although Patent No. CN103016168 A more a set of electric-control systems of design outside a set of natural gas supply system of installation may be implemented
Two kinds of fuel ratios are adjustable, but do not account for influence of the substitution rate to fuel injector, and make cost greatly to original machine is modified
Increase.
In order to meet the emission regulation of continuous improvement and realize the high-efficiency cleaning of burning, it is desirable to provide a set of low cost is lower real
The electric-control system that existing double fuel flexibly steadily controls.
Utility model content
In view of the above-mentioned problems, the purpose of this utility model is to provide one kind by calibrating best substitution ratio of NG,
The power of engine after introducing natural gas is set not decline too many GDI engine natural gas-gasoline double-fuel electric-control system.Skill
Art scheme is as follows:
A kind of GDI engine natural gas-gasoline double-fuel electric-control system, including natural gas tank, the gas outlet of natural gas tank
It passes sequentially through pressure-reducing chamber and gas injector is connected to mixing chamber, mixing chamber side is equipped with air inlet pipe, and the other side passes through air inlet
General pipeline is connected to the air inlet of engine body；Air cleaner is successively arranged in the air inlet pipe starting from the inlet, by pressure side
Port valve, air inlet pressure sensor, air flow meter and electronic throttle, electronic throttle are equipped with throttle position sensor；
The output shaft of engine body is connected to flywheel, and flywheel side is equipped with speed probe；It further include original machine ECU and adding automatically controlled list
Member adds E-Gas, air inlet pressure sensor, air flow meter, electronic throttle and solar term that electronic control unit receives original machine
The signal of door position sensor, speed probe and gas injector, the operating condition according to locating for engine calculate natural gas
Substitution rate, and communicated with original machine ECU by CAN line.
Further, the exhaust main rear end of the engine body is successively arranged ternary catalyzing unit and exhaust pipe, exhaust
General pipeline is equipped with exhaust temperature sensor and preceding lambda sensor, and ternary catalyzing unit back end line is equipped with post oxygen sensor.
Further, the exhaust pipe is connected to turbine air-intake all the way, and another way is equipped with whirlpool end by-passing valve, and even
It is connected to the escape pipe of turbine.
Further, switch electromagnetic valve is additionally provided between the natural gas tank and pressure-reducing chamber, the switch electromagnetic valve connects
It is connected to additional electronic control unit.
The beneficial effects of the utility model are: in view of GDI starts when the utility model demarcates maximum substitution ratio of NG
Machine fuel injector affected by hot loading height needs fuel oil cooling, guarantees the reliability of fuel injector after introducing natural gas；A set of gas supply is only added
System and additional electronic control unit weaken sensor signal in gas circuit, and the change in this way in original machine is little, at low cost；
Additional electronic control unit is added, calibrating best substitution ratio of NG decline the power of engine after introducing natural gas will not too
It is more.
Detailed description of the invention
Fig. 1 is the utility model GDI engine natural gas-gasoline double-fuel electric-control system structural schematic diagram.
Fig. 2 is the utility model GDI engine natural gas-gasoline double-fuel electric-control system signal transmission figure.
Fig. 3 is the utility model GDI engine natural gas-gasoline double-fuel electric-control system MAP relational graph.
In figure: 1- natural gas tank；2- switch electromagnetic valve；The pressure-reducing chamber 3-；4- gas injector；5- mixing chamber；6- air inlet
Pipe；7- inlet manifold；8- high-pressure oil pipe；9- engine body；10- exhaust main；11- exhaust temperature sensor；Oxygen senses before 12-
Device；13- gasoline ejector；14- spark plug；15- electronic throttle；16- air flow meter；17- flywheel；18- admission pressure passes
Sensor；19- E-Gas；20- pressure side by-passing valve；21- compressor；22- turbine；23- original machine ECU；24- adds electronic control unit；
25- air cleaner；The whirlpool 26- end by-passing valve；27- post oxygen sensor；28- ternary catalyzing unit；29- speed probe；30- solar term
Door position sensor.
Specific embodiment
The utility model is described in further details in the following with reference to the drawings and specific embodiments.As shown in Figure 1, a kind of
GDI engine natural gas-gasoline double-fuel electric-control system, comprising: natural gas supply system, original machine actuator and sensor, control
System processed.
Natural gas supply system includes: natural gas tank 1, switch electromagnetic valve 2, pressure-reducing chamber 3, gas injector 4, mixing chamber
5.The gas outlet of natural gas tank 1 passes sequentially through pressure-reducing chamber 3 and gas injector 4 is connected to mixing chamber 5.Gas injector 4
Injection pressure can be adjusted according to admission pressure, avoid injection back pressure excessively high.5 side of mixing chamber is equipped with air inlet pipe 6, and the other side passes through
Inlet manifold 7 is connected to the air inlet of engine body 9.It is successively arranged air cleaner starting from the inlet in the air inlet pipe 6
25, pressure side by-passing valve 20, air inlet pressure sensor 18, air flow meter 16 and electronic throttle 15 are set on electronic throttle 15
There is throttle position sensor 30；The output shaft of engine body 9 is connected to flywheel 17, and 17 side of flywheel is equipped with speed probe
29。
Control system includes original machine ECU23 and additional electronic control unit 24, adds the electronics oil that electronic control unit 24 receives original machine
Door 19, air inlet pressure sensor 18, air flow meter 16, electronic throttle 15 and throttle position sensor 30, revolution speed sensing
The signal of device 29 and gas injector 4, and communicated by CAN line with original machine ECU23.
Original machine actuator and sensor include: E-Gas 19, air flow meter 16, electronic throttle 15, electronic throttle
Door position sensor 30, speed probe 29, preceding lambda sensor 12, post oxygen sensor 27, air inlet pressure sensor 18.
10 rear end of exhaust main of engine body 9 is successively arranged ternary catalyzing unit 28 and exhaust pipe in the present embodiment, row
Gas general pipeline 10 is equipped with exhaust temperature sensor 11 and preceding lambda sensor 12, and 28 back end line of ternary catalyzing unit is equipped with post oxygen sensor
27.And exhaust pipe is connected to 22 air inlet of turbine all the way, another way is equipped with whirlpool end by-passing valve 26, and is connected to going out for turbine 22
Tracheae.The exhaust gas by turbine 22 can be reduced when whirlpool end by-passing valve 26 is opened.
Since with a part of gasoline of substitute gas, then gasoline injection amount should be reduced, the present embodiment passes through additional
Electronic control unit weakens voltage and the air flow meter signal of E-Gas signal to realize the reduction of the amount of injection of final gasoline.
The additional electronic control unit is the electronic control unit of independent development, needs to carry out weakening mark to original machine sensor signal
It is fixed, need to receive E-Gas 19, air inlet pressure sensor 18, air flow meter 16,15 and of electronic throttle of original machine simultaneously
Tach signal, and the operating condition according to locating for engine, calculate the substitution rate of natural gas.After calculating the substitution rate of natural gas
By after weakening E-Gas signal and air flow meter signal original machine ECU is passed to by CAN line together with tach signal and is used for
Gasoline injection amount is calculated, according to the substitution rate of natural gas, air flow meter signal and tach signal calculate the injection of natural gas
Amount.
The transmission and processing of each transducing signal: the ECU of additional electronic control unit and original machine is mutually communicated by CAN line.Input
The signal of additional electronic control unit includes E-Gas signal, tach signal, air flow meter signal, electronic throttle position sensing
Device signal.E-Gas signal and air flow meter signal weaken by additional electronic control unit, are transferred to after tach signal duplication
Original machine ECU.Since natural gas is the volume that gaseous state can occupy air, electronic throttle needs additional electronic control unit to control again
System.After the signal of air flow meter is transferred to additional electronic control unit, when calculating air capacity, air is divided by additional electronic control unit
Two parts, portion is transferred to original machine for calculating distributive value for the air flow meter signal after weakening, another is for calculating day combustion
The amount of injection of gas.
Natural gas-gasoline double-fuel the course of work: according to hair after additional electronic control unit receives the signal of E-Gas
The revolving speed and load of motivation call best substitution ratio of NG MAP.Additional electronic control unit will be electric according to best substitution ratio of NG
Sub- throttle signal and air flow meter signal are transferred to original machine ECU for calculating the amount of injection of gasoline after weakening.Original machine ECU connects
The air flow sensor signal de-emphasis amount received must match with E-Gas signal de-emphasis amount.Additional electronic control unit according to
Substitution ratio of NG calls the amount of injection of gas injector conduction time MAP control natural gas.Additional electronic control unit tune simultaneously
It is to re-scale with electronics throttle signal MAP driving air throttle electronic throttle aperture MAP, control throttle opening is protected
Card can also make engine be in equivalent proportion burning after introducing natural gas.It is open loop that the amendment of air-fuel ratio, which is natural gas by original machine control,
Control, the amount of injection of gasoline do closed-loop control by original machine.
In order to make its normal work, need to demarcate the MAP mentioned among the above:
Recycle minimum gasoline injection amount MAP: since the fuel injector of GDI engine is exposed in high-temperature fuel gas, so needing
Fuel oil is lubricated and cools down to it, this, which is just determined, recycles minimum fuel injection amount firstly the need of calibrating each operating condition gasoline
MAP.Its X-axis is torque [N/m], and Y-axis is delivery temperature [°C].Engine exhaust temperature under each operating condition is measured, according to difference
Delivery temperature calibrate the minimum gasoline injection amount of fuel injector.
Electronic throttle aperture MAP: since natural gas is the volume that gaseous state can occupy air, while the air-fuel ratio of natural gas
Greater than gasoline, therefore electronic throttle is unable to meet demand in the air inflow of original aperture, needs by adding electronic control unit weight
New control.Its X-axis of electronic throttle aperture MAP is substitution ratio of NG [%], and Y-axis is charge flow rate [kg/min].According to difference
Substitution rate calculate total air inflow, the electronic throttle under different substitution rates is calibrated according to air flow sensor and is opened
Degree.
Gas injector conduction time MAP: gas injector conduction time uses off-line calibration.The injection of natural gas
Valve in a pre-installation demarcates it, and X-axis is substitution ratio of NG [%], and Y-axis is gas pressure [bar], calibrates difference
Conduction time under substitution rate.
Best natural gas substitution rate MAP: measuring at this moment torque and discharge under a certain operating condition, then determine one it is natural
Gas substitution rate, R are substitution rate, and m is the every circulating fuel injection quantity of original machine, mgasFor introduce natural gas quality, the substitution ratio of NG
Minimum value is logical to be determined by the precision of gas injector.Maximum substitution rate is by the minimum gasoline injection amount MAP of each Operation mode cycle
Limitation.Best its X-axis of natural gas substitution rate MAP is revolving speed [r/min], and Y-axis is torque [N/m].Logical bench test adjustment is natural
The substitution rate of gas until the maximum substitution rate under the operating condition, and records 50 torque points under each substitution rate in 2 minutes
And emissions data.If this group of torque average value and original machine comparison decline combine discharge, such substitution rate can within 5%
To realize stable burning.Above-mentioned test is repeated under each operating condition can obtain the MAP.
MAP is engine Map table, and a corresponding output valve can be found according to the input value in chart.
Claims (4)
1. a kind of GDI engine natural gas-gasoline double-fuel electric-control system, which is characterized in that including natural gas tank (1), naturally
The gas outlet of gas tank (1) passes sequentially through pressure-reducing chamber (3) and gas injector (4) is connected to mixing chamber (5), mixing chamber (5) one
Side is equipped with air inlet pipe (6), and the other side is connected to the air inlet of engine body (9) by inlet manifold (7)；The air inlet pipe
(6) air cleaner (25), pressure side by-passing valve (20), air inlet pressure sensor (18), air are successively arranged on starting from the inlet
Flowmeter (16) and electronic throttle (15), electronic throttle (15) are equipped with throttle position sensor (30)；Engine machine
The output shaft of body (9) is connected to flywheel (17), and flywheel (17) side is equipped with speed probe (29)；It further include original machine ECU(23)
With additional electronic control unit (24), add electronic control unit (24) receive the E-Gas (19) of original machine, air inlet pressure sensor (18),
Air flow meter (16), electronic throttle (15) and throttle position sensor (30), speed probe (29) and natural gas
The signal of injection valve (4), the operating condition according to locating for engine calculate the substitution rate of natural gas, and pass through CAN line and original machine ECU
(23) it communicates.
2. GDI engine natural gas-gasoline double-fuel electric-control system according to claim 1, which is characterized in that the hair
Exhaust main (10) rear end of motivation body (9) is successively arranged ternary catalyzing unit (28) and exhaust pipe, and exhaust main is set on (10)
There are exhaust temperature sensor (11) and preceding lambda sensor (12), ternary catalyzing unit (28) back end line is equipped with post oxygen sensor (27).
3. GDI engine natural gas-gasoline double-fuel electric-control system according to claim 2, which is characterized in that the row
Tracheae is connected to turbine (22) air inlet all the way, and another way is equipped with whirlpool end by-passing valve (26), and is connected to going out for turbine (22)
Tracheae.
4. GDI engine natural gas-gasoline double-fuel electric-control system according to claim 1, which is characterized in that the day
It is additionally provided with switch electromagnetic valve (2) between right gas tank (1) and pressure-reducing chamber (3), the switch electromagnetic valve (2), which is connected to, adds automatically controlled list
First (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820909867.2U CN208456720U (en) | 2018-06-13 | 2018-06-13 | A kind of GDI engine natural gas-gasoline double-fuel electric-control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820909867.2U CN208456720U (en) | 2018-06-13 | 2018-06-13 | A kind of GDI engine natural gas-gasoline double-fuel electric-control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208456720U true CN208456720U (en) | 2019-02-01 |
Family
ID=65159884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820909867.2U Expired - Fee Related CN208456720U (en) | 2018-06-13 | 2018-06-13 | A kind of GDI engine natural gas-gasoline double-fuel electric-control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208456720U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219733A (en) * | 2019-06-27 | 2019-09-10 | 西华大学 | A kind of natural gas/gasoline double fuel GDI engine and its control method |
-
2018
- 2018-06-13 CN CN201820909867.2U patent/CN208456720U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219733A (en) * | 2019-06-27 | 2019-09-10 | 西华大学 | A kind of natural gas/gasoline double fuel GDI engine and its control method |
| CN110219733B (en) * | 2019-06-27 | 2024-01-23 | 西华大学 | Natural gas/gasoline dual-fuel GDI engine and control method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |