CN208763748U - A gasoline direct injection supercharged engine with high thermal efficiency and low emission - Google Patents

Abstract

The utility model discloses a kind of gasoline direct engines with supercharger of high thermal efficiency low emission, including an at least combustion chamber, one high pressure direct injection system, one high-energy ignition system, one three-way catalytic converter and a selective catalysis system, high pressure direct injection system is by fuel-oil atmozation and to be sprayed onto combustion chamber, high-energy ignition system is to light the fuel oil being atomized in combustion chamber, burn indoor air-fuel ratio > 25, tail gas after burning enters three-way catalytic converter, three-way catalytic converter is to reduce the pollutant load in tail gas, through three-way catalytic converter, treated that tail gas enters selective catalysis system, selective catalysis system is to handle NOx, by treated the tail gas discharge of selective catalysis system.While solving the problems, such as that Lean Burning Technique stability is poor, improves fuel economy and reduce pollutant emission, avoid reducing cost using GPF, make emission level that can meet six emission regulation of state.

Description

A kind of gasoline direct engine with supercharger of high thermal efficiency low emission

Technical field

The utility model relates to engine arts more particularly to a kind of pressurization of the gasoline direct of high thermal efficiency low emission to start Machine.

Background technique

In recent years, more harsh oil consumption emission regulation has been issued for reply energy crisis and climate change, various countries.China the The oil consumption of four stages adds tight to hundred kilometers of 5L/, and Chinese 6th stage emission standard is compared to the 5th stage emission regulation in addition to gaseous state Pollutant adds except tight 30% ~ 50%, more defines stringent particulate matter requirement: PN (ParticulateNumber, particulate matter Quantity) < 6 × 10¹¹.The pressure of regulation promotes automobile vendor to put into more energy to go exploitation new technology, hybrid vehicle and Electric car has better fuel economy and emission performance than traditional power automobile, currently, carrying traditional vapour of internal combustion engine The hybrid vehicle of vehicle, coupling internal combustion engine and motor will continue to as mainstream, so the following fuel oil warp for promoting internal combustion engine Ji property and emission performance are highly desirable.

Lean Burning Technique can significantly improve the fuel economy of engine, but be usually associated with the unstable of burning With sharply increasing for NOx discharge.Existing Lean Burning Technique is mostly layer-stepping lean burn, will cause partial region The gaseous mixture of gaseous mixture overrich, some regions is again very dilute, this will lead to the increase of gaseous pollutant.

Therefore, it is necessary to provide a kind of new engine, solving the problems, such as the same of Lean Burning Technique stability difference When, it improves fuel economy and reduces discharge, avoid reducing cost using GPF, make emission level that can meet six exhaust method of state Rule.

Utility model content

The purpose of this utility model is to provide a kind of gasoline direct engines with supercharger of high thermal efficiency low emission, are solving While the problem of Lean Burning Technique stability difference, improving fuel economy simultaneously reduces pollutant emission, avoid using GPF reduces cost, makes emission level that can meet six emission regulation of state.

To achieve the above object, the gasoline direct pressurization that the utility model provides a kind of high thermal efficiency low emission is started Machine, including an at least combustion chamber, a high pressure direct injection system, a high-energy ignition system, a three-way catalytic converter and a selection Property catalysis system, the high pressure direct injection system is by fuel-oil atmozation and to be sprayed onto the combustion chamber, the high-energy ignition system To light the fuel oil being atomized in the combustion chamber, the indoor air-fuel ratio > 25 of burning, the tail gas after burning enters The three-way catalytic converter, the three-way catalytic converter is to reduce the pollutant load in the tail gas, through described three First catalytic converter treated tail gas enters the selective catalysis system, and the selective catalysis system is to handle NOx, by the selective catalysis system, treated that the tail gas is discharged.

Burn indoor air-fuel ratio > 25, i.e., excess air coefficient is greater than 1.7, greatly improves the thermal efficiency of engine, drops Low engine consumption；Due to very high air-fuel ratio, the discharge amount of THC and CO are all up to very low level, while the discharge of NOx The level that amount will be also reduced to when air-fuel ratio is chemically correct fuel with the raising of air-fuel ratio to 25 or more.Tail gas after burning Through three-way catalytic converter (ThreeWayCatalysts, TWC) and selective catalysis system (SelectiveCatalystReduction, SCR) processing, three-way catalytic converter can suitably reduce the proportion of noble metal, CO, THC in tail gas are converted, then NOx is handled by selective catalysis system, when exhaust temperature is higher than 250 DEG C, in tail gas NOx be reduced into N₂And H2O, gasoline engine grain catcher is not being used to realize Meet the purpose of six emission regulation of state under conditions of (Gasolineparticulatefilter, GPF).

Further, the injection pressure > 300bar of the high pressure direct injection system.High injection pressure can substantially reduce spray Oily a possibility that running through away from spraying partial size, improving fuel atomization effect, reduce wet wall, control distributive value, guarantee air-fuel ratio >= 25。

Further, each ignition energy >=120 joule of the high-energy ignition system.When air-fuel ratio >=25, air and combustion The mixed gas of oil is thin, is lighted by high-energy ignition system to thin mixed gas, improves its combustion stability, protects COV (cyclical variations amount) < 5% is demonstrate,proved, by homogeneous lean combustion, fuel combustion efficiency is greatly increased, improves engine thermal effect Rate, while the discharge amount of CO, THC are substantially reduced, keep NOx discharge in a relatively low level.

Further, the gasoline direct engine with supercharger of the high thermal efficiency low emission further includes an inlet manifold, a row Gas manifold and a turbocharger, the inlet manifold to the combustion chamber input air, the exhaust manifold to The tail gas after burning is expelled to the three-way catalytic converter, the turbocharger is set to the inlet manifold and institute It states on exhaust manifold.

Further, the gasoline direct engine with supercharger of the high thermal efficiency low emission further includes being set to the inlet manifold On an air cleaner, into the air in the inlet manifold again through the turbocharger after the air cleaner Pressurization.

Further, the gasoline direct engine with supercharger of the high thermal efficiency low emission further includes being set to the inlet manifold On an intercooler and a throttle body.

Compared with prior art, the gasoline direct pressurization that the utility model provides a kind of high thermal efficiency low emission is started Machine, using high pressure direct injection system, high-energy ignition system, air-fuel ratio >=25 (homogeneous lean combustion), three-way catalytic converter and Selective catalysis system is used cooperatively, and while solving the problems, such as that Lean Burning Technique stability is poor, improves fuel oil warp Ji property simultaneously reduces pollutant emission, avoids reducing cost using GPF, makes emission level that can meet six emission regulation of state.

Detailed description of the invention

Fig. 1 is the schematic diagram of the gasoline direct engine with supercharger of the high thermal efficiency low emission of the utility model.

Specific embodiment

The embodiments of the present invention are described referring now to the drawings, similar element numbers represent similar member in attached drawing Part.

The utility model provides a kind of gasoline direct engine with supercharger 1 of high thermal efficiency low emission, thin solving It while the problem of combustion technology stability difference, improves fuel economy and reduces pollutant emission, avoid reducing using GPF Cost makes emission level that can meet six emission regulation of state.

As shown in Figure 1, the gasoline direct engine with supercharger 1 of high thermal efficiency low emission includes that an at least combustion chamber 10, one is high Press direct-injection system 20, a high-energy ignition system 30, a three-way catalytic converter 40, a selective catalysis system 50, an air inlet discrimination Pipe 60, an exhaust manifold 70, a turbocharger 80, an air cleaner 62, an intercooler 64 and a throttle body 66.

Specifically, in the present embodiment, engine 1 is three-cylinder engine 1, so having 3 combustion chambers 10, certainly, Yu Qi In his embodiment, the quantity of combustion chamber 10 can be selected as needed, and this is not restricted.

High pressure direct injection system 20 is by fuel-oil atmozation and to be sprayed onto combustion chamber 10, the injection pressure of high pressure direct injection system 20 > 300bar.High injection pressure can substantially reduce oil spout run through away from injection partial size, improve fuel atomization effect, reduce wet wall A possibility that, distributive value is controlled, guarantees air-fuel ratio >=25.

High-energy ignition system 30 is to light the fuel oil being atomized in combustion chamber 10, air-fuel ratio > 25 in combustion chamber 10, high It can each ignition energy >=120 joule of ignition system 30.When air-fuel ratio >=25, the mixed gas of air and fuel oil is thin, passes through High-energy ignition system 30 lights thin mixed gas, improves its combustion stability, guarantees COV (cyclical variations amount) < 5%, by homogeneous lean combustion, greatly increase fuel combustion efficiency, improve 1 thermal efficiency of engine, while substantially reduce CO, The discharge amount of THC keeps NOx discharge in a relatively low level.

Tail gas after burning enters three-way catalytic converter 40, and three-way catalytic converter 40 is to reduce the pollution in tail gas CO, THC in object content, conversion tail gas, through three-way catalytic converter 40, treated that tail gas enters selective catalysis system 50, Treated the tail gas of selective catalysis system 50 is discharged to handle NOx for selective catalysis system 50.

More specifically, the air-fuel ratio > 25 in combustion chamber 10, i.e. excess air coefficient are greater than 1.7, engine 1 is greatly improved The thermal efficiency, reduce by 1 oil consumption of engine；Due to very high air-fuel ratio, the discharge amount of THC and CO are all up to very low level, The water that the discharge amount of NOx will be also reduced to when air-fuel ratio is chemically correct fuel with the raising of air-fuel ratio to 25 or more simultaneously It is flat.Tail gas after burning is through three-way catalytic converter 40 (ThreeWayCatalysts, TWC) and selective catalysis system 50 (SelectiveCatalystReduction, SCR) processing, three-way catalytic converter 40 can suitably reduce matching for noble metal Than, CO, THC in tail gas are converted, then NOx is handled by selective catalysis system 50, when exhaust temperature is higher than 250 DEG C, NOx in tail gas is reduced into N₂And H2O, gasoline engine grain catcher is not being used to realize Meet the purpose of six emission regulation of state under conditions of (Gasolineparticulatefilter, GPF).

Inlet manifold 60 is to 10 input air of combustion chamber, exhaust manifold 70 is to be expelled to three for the tail gas after burning First catalytic converter 40, turbocharger 80 are set on inlet manifold 60 and exhaust manifold 70.Air cleaner 62, intercooler 64 And throttle body 66 is set in inlet manifold 60, enters the path of combustion chamber 10 with air for sequence, air cleaner 62 is set to The front end of turbocharger 80, intercooler 64 and throttle body 66 are sequentially arranged in the rear end of turbocharger 80.

Compared with prior art, the utility model provides a kind of gasoline direct engine with supercharger of high thermal efficiency low emission 1, utilize high pressure direct injection system 20, high-energy ignition system 30, air-fuel ratio >=25 (homogeneous lean combustion), three-way catalytic converter 40 and selective catalysis system 50 be used cooperatively, while solving the problems, such as that Lean Burning Technique stability is poor, improve Fuel economy simultaneously reduces pollutant emission, avoids reducing cost using GPF, makes emission level that can meet six emission regulation of state.

It above disclosure is merely preferred embodiments of the utility model, certainly cannot be practical new to limit this with this The interest field of type, therefore equivalent variations made according to the patent scope of the utility model still belong to the utility model and are covered Range.

Claims (6)

1. A gasoline direct injection turbocharged engine with high thermal efficiency and low emission, the gasoline direct injection turbocharged engine with high thermal efficiency and low emission comprises: at least one combustion chamber; a high pressure direct injection system for atomizing and injecting fuel into the combustion chamber; a high-energy ignition system, the high-energy ignition system is used to ignite the fuel atomized in the combustion chamber, and the air-fuel ratio in the combustion chamber is >25; A three-way catalytic converter, the exhaust gas after combustion enters the three-way catalytic converter, and the three-way catalytic converter is used to reduce the pollutant content in the exhaust gas; and a selective catalytic system, the exhaust gas treated by the three-way catalytic converter enters the selective catalytic system, the selective catalytic system is used to treat NOx, and the exhaust gas treated by the selective catalytic system is The exhaust gas is discharged. 2 . The gasoline direct injection supercharged engine with high thermal efficiency and low emission according to claim 1 , wherein the fuel injection pressure of the high-pressure direct injection system is greater than 300 bar. 3 . 3 . The gasoline direct injection supercharged engine with high thermal efficiency and low emission according to claim 1 , wherein the high-energy ignition system has an ignition energy of ≥120 joules per time. 4 . 4. The gasoline direct injection turbocharged engine with high thermal efficiency and low emission as claimed in claim 1, wherein the gasoline direct injection turbocharged engine with high thermal efficiency and low emission further comprises: an intake manifold for feeding air into the combustion chamber; an exhaust manifold for discharging the combusted exhaust gas to the three-way catalytic converter; and a turbocharger, the turbocharger is arranged on the intake manifold and the exhaust manifold. 5 . The gasoline direct injection supercharged engine with high thermal efficiency and low emission as claimed in claim 4 , wherein the gasoline direct injection supercharged engine with high thermal efficiency and low emission further comprises a gasoline direct injection supercharged engine arranged on the intake manifold. 6 . An air filter, the air entering the intake manifold passes through the air filter and then is supercharged by the turbocharger. 6 . The gasoline direct injection turbocharged engine with high thermal efficiency and low emission according to claim 4 , wherein the gasoline direct injection turbocharged engine with high thermal efficiency and low emission further comprises a gasoline direct injection turbocharged engine arranged on the intake manifold. 7 . An intercooler and throttle body.