CN208564747U - Petrol engine suitable for medium and heavy vehicle - Google Patents
Petrol engine suitable for medium and heavy vehicle Download PDFInfo
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- CN208564747U CN208564747U CN201821096485.9U CN201821096485U CN208564747U CN 208564747 U CN208564747 U CN 208564747U CN 201821096485 U CN201821096485 U CN 201821096485U CN 208564747 U CN208564747 U CN 208564747U
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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 utility model discloses the petrol engines for the petrol engine method for controlling combustion for being suitable for medium and heavy vehicle, the exhaust outlet of each cylinder of engine is communicated by exhaust manifold with exhaust main, engine speed detector is equipped on a cylinder crankshaft of engine, intake manifold pressure sensor is equipped in an inlet manifold, air flow sensor is equipped on the inlet manifold, lambda sensor is equipped on the exhaust main, exhaust gas recirculation circuit is connected between exhaust main and inlet manifold, direction is recycled along exhaust gas, EGR valve is connected in turn on the exhaust gas recirculation circuit, intercooler and check valve；A water jet is respectively disposed in the inlet manifold of each cylinder, water tank exports the water jet that high-pressure hydraulic pump and each cylinder are sequentially connected by water pipe.The present apparatus can effectively widen the range of high-efficiency cleaning burning.
Description
Technical field
The utility model relates to a kind of method for controlling combustion suitable for petrol engine, especially design a kind of medium and heavy vehicle
Petrol engine method for controlling combustion and engine suitable for this method.
Background technique
In recent years, according to the development trend of truck energy diversification and the good application prospect of Fuel Petroleum truck, have
Necessity exploitation and optimization are applied to the gasoline engine and extended-range hybrid power system of medium and heavy vehicle.But at present for medium and heavy vehicle vapour
The exploitation of oil turbine and Optimization Work are not very sufficiently that traditional gasoline engine discharge capacity is low, it is difficult to meet medium and heavy
The demand of car market.
With reference to the design of natural gas heavy type spark ignition engine, if can realize that gasoline is lighted a fire on diesel oil machine platform
Burning, using the high cylinder block strength of diesel engine, can bear the characteristics of higher detonation pressure, be sprayed using high supercharging pressure level, high compression ratio, super-pressure
Advanced combustion technologies such as (> 400bar) is penetrated, is expected to realize the further promotion of the gasoline engine thermal efficiency, meets it medium and heavy
Application requirement on vehicle.However, since cylinder diameter is big, tumble flow is weaker and as the continuous improvement of compression ratio and pressure ratio is led
The more harsh surroundings caused, necessarily will increase the probability of happening of pinking, limit what geometrical compression ratio improved in turn
Potentiality, the final promotion for restricting fuel economy.Therefore, it needs to explore effective combustion control theme control engine and inhibits quick-fried
Shake, to extend the load range of high-efficiency cleaning burning.
Existing research shows that exhaust gas recycling (EGR) on the one hand can reduce end mixture temperature and burning velocity, separately
Inert composition in one side exhaust gas will increase the degree of extinguishing reaction, extend the autoignition time of end gaseous mixture, thus
Effectively inhibit pinking.Alger et al. applies the result of study in GDI engine to show in Smaller load sub-load work EGR
Condition, EGR can reduce by 4% oil consumption by reducing pumping loss, and NOx is reduced；And in higher load, the introducing of EGR is effectively excellent
Change combustion phase, reduces delivery temperature, to inhibit pinking, and avoid fuel oil enriching, therefore oil consumption reduction by 10%~
20%.Lattimore et al. research is studied in middle small load condition changes EGR (0-13%) to unsupercharged GDI gasoline engine
It influences, as a result, it has been found that the available inhibition of pinking, combustion phase is optimized with the increase of EGR rate.But due to using
High concentration EGR would generally reduce flame propagation velocity, and circular wave increases, and need to cooperate using other modes and accelerate burning speed
Degree, to improve EGR in the tolerance of partial load condition.
Water spray can equally improve the thermodynamic state of end gaseous mixture, inhibit pinking.Studies have shown that if can be to starting
The design of machine optimizes, and water spray strategy can not only improve power output, reduce discharge, and have apparent fuel-economizing energy
Power.Water mainly has following characteristics as the working medium for carrying thermal energy: (1) evaporation latent heat is big (2430kJ/kg), is RON95E5 vapour
6 times of oily (~397kJ/kg), are 2.5 times of ethyl alcohol (~952kJ/kg)；(2) bigger than the specific heat capacity of air.So compressing
With can bring additional cooling effect in combustion process, reduce the ignition temperature in cylinder, on the one hand reduce heat transfer, on the other hand replace
For fuel oil enriching, inhibit pinking, optimize combustion phase, to significantly improve oil consumption, the promotion thermal efficiency in acquisition.However, due to
There are inert gas (water) in air-intake component, although amount is few, it can influence laminar flame speed and end gas simultaneously
Spontaneous combustion tendency, it is therefore desirable to optimize the injection strategy of water and gasoline, thus under the premise of keeping certain laminar flame speed most
The delay period of the extension end gas of big degree.
Summary of the invention
The shortcomings that the purpose of the utility model is to overcome prior arts provides one kind and realizes on diesel engine platform base
Gasoline spark ignition combustion increases discharge capacity, the thermal efficiency of small load condition in raising, widens being applicable in for load in high load working condition
In the petrol engine of medium and heavy vehicle.
The petrol engine of petrol engine method for controlling combustion suitable for medium and heavy vehicle, including starting with multi-cylinder
Machine, high pressure common rail fuel injection system and air throttle, the high pressure common rail fuel injection system is by common rail chamber and fuel injector group
At fuel injector is mounted on the cylinder cap of each cylinder of engine, and inlet manifold passes through each gas of inlet manifold and engine
Cylinder communicates, and the exhaust outlet of each cylinder of engine is communicated by exhaust manifold with exhaust main, in a cylinder of engine
Crankshaft is equipped with engine speed detector, intake manifold pressure sensor is equipped in an inlet manifold, in the air inlet
General pipeline is equipped with air flow sensor, and lambda sensor is equipped on the exhaust main, total in the exhaust main and air inlet
It is connected with exhaust gas recirculation circuit between pipe, recycles direction along exhaust gas, is connected in turn on the exhaust gas recirculation circuit
EGR valve, intercooler and check valve；A water jet, water tank outlet are respectively disposed in the inlet manifold of each cylinder
The water jet of high-pressure hydraulic pump and each cylinder is sequentially connected by water pipe；The air flow sensor, air throttle,
Intake manifold pressure sensor, water jet, fuel injector, common rail chamber, engine speed detector, lambda sensor and EGR valve point
It is not connected in electronic controller.
Compared with prior art, the utility model has the beneficial effects that
The utility model can overcome the problems, such as that conventional gasoline machine discharge capacity is small, the thermal efficiency is low, and high load working condition passes through EGR
It couples air intake duct water spray and inhibits pinking, can effectively widen the range of high-efficiency cleaning burning, meet it on medium and heavy vehicle
Using；
The utility model couples air intake duct water spray by EGR and inhibits pinking, largely reduces the dependence to EGR.
It is compared since the evaporation latent heat of water is big with EGR, in-cylinder combustion temperature can effectively reduce using a small amount of water, reduce heat transfer, suppression
Pinking effect processed is more significant, can further promote the thermal efficiency, reduces oil consumption.
Air intake duct water injector used by the utility model is smaller to engine block change, at low cost.
The utility model utilizes the existing high pressure common rail fuel injection system of diesel engine, can guarantee to reduce the same of change
When, it realizes the high-pressure injection of gasoline, accelerates the mixing of gasoline and air.
Detailed description of the invention
Fig. 1 is a kind of petrol engine schematic diagram suitable for medium and heavy vehicle of the utility model.
In figure:
1 --- diesel-engine body 2 --- spark plug 3 --- engine speed detector
4 --- fuel injector 5 --- common rail chamber 6 --- water jets
7 --- inlet manifold 8 --- air throttle 9 --- inlet manifolds
10 --- air flow sensor 11 --- intake manifold pressure sensor 12 --- exhaust manifolds
13 --- lambda sensor 14 --- exhaust main 15 --- EGR lines
16 --- EGR valve 17 --- intercooler 18 --- check valves
19 --- electronic controller 20 --- high-pressure hydraulic pump 21 --- water tanks
Specific embodiment
In order to be more clear the technical solution of the utility model, the utility model is done further in detail below in conjunction with attached drawing
It describes in detail bright.It should be appreciated that specific example described herein is only to explain the utility model, but it is not limited to this example.
As shown in Figure 1, a kind of petrol engine suitable for medium and heavy vehicle of the utility model is in existing diesel engine
The improvement carried out in machine structure, the existing petrol engine suitable for medium and heavy vehicle includes the engine with multi-cylinder, exhaust gas
(EGR) system of recycling and electronic controller 19.
The engine of the multi-cylinder includes diesel-engine body 1, high pressure common rail fuel injection system, spark plug 2 and solar term
Door 8.The high pressure common rail fuel injection system is made of common rail chamber 5 and fuel injector 4, and fuel injector 4 is mounted on each of engine
On the cylinder cap of cylinder.Inlet manifold 9 is communicated by inlet manifold 7 with each cylinder of engine, each cylinder of engine
Exhaust outlet is communicated by exhaust manifold 12 with exhaust main 14.
The improvement structure of the utility model includes: that engine speed detector is equipped on a cylinder crankshaft of engine
3, it is equipped with intake manifold pressure sensor 11 in an inlet manifold 7, air mass flow is equipped on the inlet manifold 9 and is sensed
Device 10 is equipped with lambda sensor 13 on the exhaust main.
Exhaust gas recirculation circuit 15 is connected between the exhaust main 14 and inlet manifold 9.Along exhaust gas recycling side
To being connected with EGR valve 16, intercooler 17 and check valve 18 in turn on the exhaust gas recirculation circuit 15.
A water jet 6 is respectively disposed in the inlet manifold 7 of each cylinder, the outlet of water tank 21 passes through water pipe
It is sequentially connected the water jet 6 of high-pressure hydraulic pump 20 and each cylinder.
The air flow sensor 10, air throttle 8, intake manifold pressure sensor 11, water jet 6, fuel injector 4,
Common rail chamber 5, engine speed detector 3, lambda sensor 13 and EGR valve 16 are connected respectively at electronic controller 19.
The control method of the present apparatus is divided into middle small load condition control method and big duty control method:
The middle small load condition control method, comprising the following steps:
Electronic controller 19 acquires engine rotational speed signal i, Induction air flow signal a, manifold pressure sensor signal
B analyzes and determines the rate of load condensate of engine, when engine load is being more than or equal to 10% and when less than 60%, the electronics control
Device 19 processed issues fuel injector pulse width signal e, water jet pulse width signal d controls the opening of fuel injector 4 of each cylinder respectively, is mounted on
Water jet 6 in each inlet manifold is closed, and common rail pressure is adjusted to be greater than 400bar, realizes gasoline superhigh pressure jetting,
And it is mounted on the exhaust gas recirculation circuit between exhaust main 14 and inlet manifold 9 by EGR valve opening amount signal g control
Aperture is opened and adjusted to EGR valve 16, introduces exhaust gas to inlet manifold 9, according to the difference of rate of load condensate, makes EGR rate control in 5%-
15%, to increase throttle opening, reduce pumping loss, improves the thermal efficiency, wherein rate of load condensate is bigger, then EGR rate is higher；
Electronic controller 19 is by issuing oxygen sensor signal h to the lambda sensor 13 that is mounted on exhaust main 14, while to each
The fuel injector 4 of cylinder issues the gasoline distributive value of corresponding fuel injector pulse width signal e control fuel injector 4, guarantees in each cylinder
Gaseous mixture equivalent proportion be 1.
The high load working condition control method, comprising the following steps:
Electronic controller 19 acquires engine rotational speed signal i, Induction air flow signal a, manifold pressure sensor signal
B analyzes and determines the rate of load condensate of engine, when engine load be more than or equal to 60% and be less than or equal to 100% when, it is described
Electronic controller 19 issues fuel injector pulse width signal e, water jet pulse width signal d controls the fuel injector 4 of each cylinder, installation respectively
Water jet 6 in each inlet manifold is opened, and common rail pressure is adjusted to be greater than 400bar, realizes the spray of gasoline super-pressure
It penetrates, and EGR valve 16 is controlled by EGR valve opening amount signal g and opens and adjust aperture, exhaust gas is introduced to inlet manifold 9, according to negative
The difference of lotus rate makes EGR rate control in 10%-20%, and wherein rate of load condensate is bigger, then EGR rate is higher；Electronic controller 19 passes through
The injection pulse width of fuel injector, the injection pulse width of water jet are adjusted, control sprays into the water of each cylinder and quality of gasoline ratio is
5%-40%, wherein rate of load condensate is bigger, then water and the quality of gasoline ratio for spraying into each cylinder are bigger.Electronic controller 19 passes through
Oxygen sensor signal h is issued to the lambda sensor 13 being mounted on exhaust main, while issuing phase to the fuel injector of each cylinder 4
The gasoline distributive value for the fuel injector pulse width signal e control fuel injector 4 answered guarantees that the equivalent proportion of gaseous mixture in cylinder is 1.Engine exists
In-cylinder combustion temperature will be effectively reduced using " EGR " coupling " water spray " strategy in big load, inhibits pinking；On the other hand, can also subtract
Few heat transfer loss, replacing fuel oil enriching strategy, to significantly improve oil consumption and the thermal efficiency.
Claims (1)
1. being suitable for the petrol engine of medium and heavy vehicle, it is characterised in that: including engine, high-pressure common rail fuel oil with multi-cylinder
Spraying system and air throttle, the high pressure common rail fuel injection system are made of common rail chamber and fuel injector, and fuel injector is mounted on
On the cylinder cap of each cylinder of engine, inlet manifold is communicated by inlet manifold with each cylinder of engine, engine
The exhaust outlet of each cylinder is communicated by exhaust manifold with exhaust main, and engine is equipped on a cylinder crankshaft of engine
Rotating speed detector is equipped with intake manifold pressure sensor in an inlet manifold, and air stream is equipped on the inlet manifold
Quantity sensor is equipped with lambda sensor on the exhaust main, is connected with exhaust gas between the exhaust main and inlet manifold
Recirculating line, along exhaust gas recycle direction, be connected in turn on the exhaust gas recirculation circuit EGR valve, intercooler and
Check valve；A water jet is respectively disposed in the inlet manifold of each cylinder, water tank outlet passes through water pipe successively
Connect the water jet of high-pressure hydraulic pump and each cylinder；The air flow sensor, air throttle, intake manifold pressure sensing
Device, water jet, fuel injector, common rail chamber, engine speed detector, lambda sensor and EGR valve are respectively at electronic controller phase
Even.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821096485.9U CN208564747U (en) | 2018-07-11 | 2018-07-11 | Petrol engine suitable for medium and heavy vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821096485.9U CN208564747U (en) | 2018-07-11 | 2018-07-11 | Petrol engine suitable for medium and heavy vehicle |
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| Publication Number | Publication Date |
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| CN208564747U true CN208564747U (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821096485.9U Active CN208564747U (en) | 2018-07-11 | 2018-07-11 | Petrol engine suitable for medium and heavy vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843446A (en) * | 2018-07-11 | 2018-11-20 | 天津大学 | Petrol engine method for controlling combustion and petrol engine suitable for medium and heavy vehicle |
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2018
- 2018-07-11 CN CN201821096485.9U patent/CN208564747U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843446A (en) * | 2018-07-11 | 2018-11-20 | 天津大学 | Petrol engine method for controlling combustion and petrol engine suitable for medium and heavy vehicle |
| CN108843446B (en) * | 2018-07-11 | 2023-08-29 | 天津大学 | Gasoline engine combustion control method suitable for medium and heavy duty vehicle and gasoline engine |
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