A kind of high pressure EGR system of vehicle motor
Technical field
The present invention relates to a kind of egr system, more particularly to a kind of high pressure EGR system of vehicle motor.
Background technology
EGR (English full name:Exhaust Gas Recirculation, Chinese translation:Waste gas is recycled) technology starting
The aspects such as machine fuel-economizing, emission reduction play the role of important.Increasingly harsh with oil consumption and Abgasgesetz, EGR technology is in supercharging
Application on petrol engine is increasingly becoming a kind of trend.Application EGR technology will necessarily turn into major masters on supercharging gasoline engine
One main flow of machine factory engine technology upgrading.EGR technology is applied to be broadly divided into high pressure EGR and low pressure on supercharging gasoline engine
Two kinds of technology paths of EGR, gasoline engine high pressure EGR technology relative maturity.
In the high pressure EGR technology application of current supercharging gasoline engine applying electronic booster, compared to conventional high pressure EGR
System is, it is necessary to increased multiple check valves, sensor and charge air cooler, application cost is high, difficulty is arranged in increase;Required control is held
Row device is more, demarcates more difficult;After EGR valve is arranged in cooler for recycled exhaust gas, the risk that EGR valve fails by coking carbon deposit is increased;
The pipeline diameter of EGR gaseous mixtures circulation is big, increased arrangement difficulty and cost.
The content of the invention
It is an object of the invention to provide a kind of simple structure, cost is relatively low, and arrangement is simple and is easy to the supercharging demarcated
The high pressure EGR system of gasoline engine.
Especially, the invention provides a kind of high pressure EGR system of vehicle motor, by engine, wherein, the hair
Motivation has air inlet and exhaust outlet, including:
Air inlet pipeline, before being arranged at the air inlet, the gas for the engine is flowed into;
Gas exhaust piping, is arranged at after the exhaust outlet, for the waste gas discharge of the engine;
EGR line, is connected between the engine intake and the gas exhaust piping, for by the gas exhaust piping
The portion of discharge is re-fed into the engine again after carrying out waste gas recycling, so that the part of engine discharge
Waste gas is recycled;With
Electron pressurizing unit, it passes through the side that pipeline is arranged at the air inlet pipeline, for entering the engine
Air is pressurized.
Further, the air inlet pipeline includes admission line, and the turbine being sequentially connected through the admission line increases
Depressor, check valve, charge air cooler, air throttle and inlet manifold;
Wherein, the Electron pressurizing unit is connected to the both sides of the check valve by pipeline, and positioned at the charge air cooler with
Between the turbocharger, formation parallel pipeline in parallel with the check valve.
Further, the turbocharger includes two groups of air inlet/outlets, wherein first group of air inlet/outlet be connected to it is described
In air inlet pipeline, second group of air inlet/outlet is connected in the gas exhaust piping;
The gas flows through the air inlet of first group of air inlet/outlet of the turbocharger by the admission line
Mouthful enter the turbocharger, the turbocharger to after the gas boosting by first group of air inlet/outlet outlet
Mouth out, then flows through the parallel pipeline, the charge air cooler, the air throttle and the inlet manifold to the engine successively
Air inlet flow into the engine.
Further, it is configured at the parallel pipeline, when the Electron pressurizing unit works, the check valve is closed automatically
Close, the charge air cooler is flowed to after all flowing through the Electron pressurizing unit from turbocharger gas out, it is described unidirectional
Valve is used to prevent the gas for flowing to the charge air cooler from the Electron pressurizing unit from being flowed back by the path at the check valve;Work as institute
When stating Electron pressurizing unit closing, the Electron pressurizing unit is gas passage, and two are divided into from turbocharger gas out
Part, by flowing to the charge air cooler after the check valve, remaining portion gas are through the Electron pressurizing unit for most of gas
Flow to the charge air cooler again afterwards.
Further, the gas exhaust piping includes discharge duct, and the exhaust discrimination being sequentially connected through the discharge duct
Pipe, the turbocharger, preceding catalyst converter and rear catalyst converter.
Further, one end of the EGR line is connected to the institute between the exhaust manifold and the turbocharger
State at discharge duct, the other end is connected at the air inlet of the engine;
Wherein, from the exhaust outlet of engine waste gas out by the exhaust manifold rear portion waste gas stream
Air inlet through flowing through second group of air inlet/outlet of the turbocharger by the discharge duct enters the turbine
Booster, then by second group of air inlet/outlet gas outlet out, through the preceding catalyst converter and it is described after catalyst converter heel row
Go out, another part waste gas is entered into during the EGR line send into after waste gas recycling the engine.
Further, the EGR line includes EGR conduit according to exhaust gas flow direction, and by the EGR conduit successively
The EGR valve of connection, cooler for recycled exhaust gas and EGR gas rails, flow through the EGR line waste gas be assigned to by the EGR gas rail it is described
In engine.
Further, the engine is three cylinder supercharging gasoline engines.
Be arranged at Electron pressurizing unit on the air inlet pipeline of high pressure EGR system by the present invention, parts compared to existing technology
Few, application cost is low, and arrangement difficulty is relatively low, and the actuator of required control is less, it is easy to demarcate.Solve in the prior art
The high cost of presence, difficult arrangement, demarcation difficult problem, so as on the premise of the feasibility of application is ensured, improve electronics
The oil-saving effect that booster and high pressure EGR technology are applied on supercharging gasoline engine, and then promoted Electron pressurizing unit and high pressure EGR
Application of the technology on supercharging gasoline engine.
Fresh air different flow pipe corresponding from EGR exhaust in system of the invention, required pipeline diameter is smaller,
It is easier to arrangement.
Before EGR valve is arranged in into cooler for recycled exhaust gas in the EGR circulatory systems of the invention, it is to avoid EGR valve is because of coking carbon deposit
Failure.
This programme is applied to three cylinder supercharging gasoline engines, and three cylinder machines, can be further by Electron pressurizing unit without exhaust interference
Scavenging efficiency is improved, gas in the jar temperature is reduced, so as on the premise of engine is working properly, increase ignition advance angle, carried
High-energy utilization rate, further lifts the fuel economy of three cylinder supercharging gasoline engines.
Brief description of the drawings
Describe some specific embodiments of the invention in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.In accompanying drawing:
Fig. 1 is the structural representation of the high pressure EGR system of vehicle motor according to an embodiment of the invention.
Specific embodiment
Fig. 1 is the structural representation of the high pressure EGR system of supercharging gasoline engine according to an embodiment of the invention.
Especially, refering to Fig. 1, the invention provides a kind of high pressure EGR system 100 of vehicle motor, by engine
10, wherein, the engine 10 has air inlet and exhaust outlet.The high pressure EGR system 100 of the vehicle motor can include into
Air pipe 20, gas exhaust piping 30, EGR line 40 and Electron pressurizing unit 50.Wherein, air inlet pipeline 20 be arranged at the air inlet it
Before, the gas for the engine 10 is flowed into.Gas exhaust piping 30 is arranged at after the exhaust outlet, for the engine 10
Waste gas discharge.EGR line 40 is connected between the air inlet of the engine 10 and the gas exhaust piping 30, for by the row
The portion discharged at air pipe 30 is re-fed into the engine 10 again after carrying out waste gas recycling, so that described start
The portion of the discharge of machine 10 is recycled.Electron pressurizing unit 50 is arranged at the side of the air inlet pipeline 20 by pipeline,
For being pressurized to the air for entering the engine 10.
Be arranged at Electron pressurizing unit 50 on the air inlet pipeline 20 of high pressure EGR system by the present invention, and compared to existing technology zero
Part is few, and application cost is low, and arrangement difficulty is relatively low, and the actuator of required control is less, it is easy to demarcate.Solve existing skill
The problems such as high cost present in art, difficult arrangement, difficult demarcation and the coking carbon deposit of EGR valve 42 failure risk, so that
On the premise of ensureing the feasibility of application, improve Electron pressurizing unit 50 and high pressure EGR technology applies on supercharging gasoline engine
Oil-saving effect, and then promoted the application of Electron pressurizing unit 50 and high pressure EGR technology on supercharging gasoline engine.
Used as a specific embodiment, the air inlet pipeline 20 includes admission line 21, and through the admission line 21 according to
The turbocharger 22 of secondary connection, check valve 23, charge air cooler 24, air throttle 25 and inlet manifold 26.Wherein, the electronics supercharging
Device 50 is connected to the both sides of the check valve 23 by pipeline, and positioned at the charge air cooler 24 and the turbocharger 22 it
Between, formation parallel pipeline in parallel with the check valve 23.
The turbocharger 22 includes two groups of air inlet/outlets, wherein first group of air inlet 221, gas outlet 222 are connected to
In the air inlet pipeline 20, second group of air inlet 223, gas outlet 224 are connected in the gas exhaust piping 30.As shown in figure 1, figure
Middle arrow A signified direction is the flow direction of gas in the air inlet pipeline before engine 10, and the air inlet gas is by the air inlet
The air inlet 221 that pipeline 21 flows through first group of air inlet/outlet of the turbocharger 22 enters the turbocharger
22, after 22 pairs of gas boostings of the turbocharger by first group of air inlet/outlet gas outlet 222 out, then successively
Flow through the parallel pipeline, the charge air cooler 24, the air throttle 25 and the inlet manifold 26 entering to the engine 10
Gas port flows into the engine 10.Electron pressurizing unit of the present invention 50 is arranged between charge air cooler 24 and turbocharger 22, work
When fresh air is pressurized, increase response spy of the engine 10 under the operating modes such as cold start-up, anxious accelerations, slow-speed of revolution underload
Property.When engine 10 starts, cylinder temperature is relatively low, and fuel atomization effect is bad, is usually present the situation of oil spout overrich, the operation
In interval, exhaust-driven turbo-charger exhaust-gas turbo charger 22 not yet intervenes work, adds after Electron pressurizing unit 50, can increase the air into cylinder
Amount, promotes full combustion of fuel, improves fuel economy, reduces engine 10 and discharges, additionally, there is part oil spout before contrast
Overrich and lose the situation of part of fuel, the heat that loss part fuel combustion is discharged can the warming-up of acceleration motor 10, drop
Low friction work(.After applying electronic booster 50, the non pressurized operating mode of the engine such as cold start-up and slow-speed of revolution underload 10 can be made up,
The intake velocity of engine 10 can be increased, shorten response speed, under EGR operation areas, anxious accelerating mode, response lag, electricity
Sub- booster 50 again may be by increasing the response time of air inflow and admission pressure to shorten engine 10.
Specifically, it is configured at the parallel pipeline, when the Electron pressurizing unit 50 works, the check valve 23 is automatic
Close, the charge air cooler 24 flowed to after all flowing through the Electron pressurizing unit 50 from the gas out of the turbocharger 22,
The check valve 23 is used to prevent the gas for flowing to the charge air cooler 24 from the Electron pressurizing unit 50 from passing through the check valve 23
The path backflow at place.When the Electron pressurizing unit 50 is closed, the Electron pressurizing unit 22 is gas passage, is increased from the turbine
The gas out of depressor 22 is divided into two parts, and most of gas is remaining by flowing to the charge air cooler 24 after the check valve 23
Portion gas flow to the charge air cooler 24 again after the Electron pressurizing unit 50.Now the path of check valve 23 primarily serves bypass
Effect.
Used as a specific embodiment, as shown in fig. 1, arrow B signified direction is in the gas exhaust piping after engine 10
The flow direction of gas.Wherein, the gas exhaust piping 30 includes discharge duct 31, and the row being sequentially connected through the discharge duct 31
Gas manifold 32, the turbocharger 22, preceding catalyst converter 33 and rear catalyst converter 34.Preceding catalyst converter 33 and rear catalyst converter 34 mainly rise
To the vehicle motor 10 being discharged into in air tail gas be catalytically decomposed after discharge, reduce tail gas in pernicious gas,
Reduce pollution.
Further, one end of the EGR line 40 be connected to the exhaust manifold 32 and the turbocharger 22 it
Between the discharge duct 31 at, the other end is connected at the air inlet of the engine 10.Wherein, from the engine
10 exhaust outlet waste gas out is flowed through by the rear portion waste gas of the exhaust manifold 32 by the discharge duct 31
The air inlet 223 of second group of air inlet/outlet of the turbocharger 22 enters the turbocharger 22, then by institute
State second group of gas outlet of air inlet/outlet 224 out, through the preceding catalyst converter 33 and it is described after discharge after catalyst converter 34, another portion
Point waste gas is entered into during the EGR line 40 send into after waste gas recycling the engine 10.Specifically, arrow C in Fig. 1
Signified direction is flow direction of the waste gas in EGR line.The EGR line 40 includes EGR conduit 41, and by described
EGR valve 42, cooler for recycled exhaust gas 43 and EGR gas rail 44 that EGR conduit 41 is sequentially connected, the waste gas for flowing through the EGR line 40 passes through
The EGR gas rail 44 is assigned in the engine 10.
Now, EGR line 40 is arranged on before turbocharger 22 takes gas point, and using single pipeline directly by part
Waste gas is exported and reused in engine 10, and the fresh air entered from engine 10 is individually split up into different pipelines, makes
Required pipeline diameter is smaller, it is easier to arrange.Before the EGR valve 42 on EGR line 40 is arranged in cooler for recycled exhaust gas 43 simultaneously, keep away
Exempt from EGR valve 42 to be failed because of coking carbon deposit.
Engine of the present invention 10 is three cylinder supercharging gasoline engines.Because three cylinder machines are without exhaust interference, it is pressurized by electronics
Device 5021 can further improve scavenging efficiency, reduce gas in the jar temperature, so that on the premise of engine 10 is working properly,
Increase ignition advance angle, improves capacity usage ratio, further the fuel economy of three cylinder supercharging gasoline engines of lifting.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple of the invention and show
Example property embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure
It is determined that or deriving many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all these other variations or modifications.