CN1414227A

CN1414227A - Inner cylinder electric controlled direct spray pressurizing and exhausting valve type two stroke gasoline engine

Info

Publication number: CN1414227A
Application number: CN02124603A
Authority: CN
Inventors: 赖大鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-16
Filing date: 2002-06-16
Publication date: 2003-04-30

Abstract

The invented two stroke gasoline engine possesses in the cylinder, an electric-controlled direct spray system and exhaust turbo booster system, it adopts pressure air intake. It is also installed with an exhaust valve, and exhaust port and scavenging port are on the side of piston down stop-point. Advantages are: 1. it can satisfy all conditions required for stratified thin combustion and strict exhaust conditions; 2. the exhaust port is closed before the scavenging port. At 45 deg. after down stop-point, the compression stroke begins, 3. It does not use crankcase to scavenge gas and adopts splash lubrication. 4. It adopts pressure air intake.

Description

Supercharging of inner cylinder electric controlled direct spray type and outlet valve formula two-stroke gasoline engine

There is the file of examination reference role to have to the present invention: 3.1.4 in " an Automobile Engineering Manual design piece of writing " and the content of Fig. 3-2-5." Automobile Engineering Manual. a motorcycle piece of writing " in table 3-2-18 in the content of sequence number 12.The content of 6.1.3 in " automobile gas emission pollution is administered and catalytic converter ".

One, basic structure and principle

1, basic structure:

This two-stroke gasoline engine not only has the inner cylinder electric controlled direct spray system, has blowdown turbocharging system simultaneously, takes pressure breathing.And outlet valve is housed also.And designing and arranging gas port and scavenging port are all in the piston lower dead center on one side.Relief opening Before Bottom Dead Center 70 ° open; Scavenging port Before Bottom Dead Center 45 ° open.

2, principle summary:

During engine operation, exhaust driven gas turbine drives coaxial gas compressor and rotates.The pressurized air that gas compressor produces through after the switching on time and Flow-rate adjustment of scavenging air valve, is linked to each other with the scavenging port of cylinder by admission line.

When piston Before Bottom Dead Center 70 ° open relief opening after, free exhaust begins.Waste gas pours outlet pipe at a high speed under the pressure of 0.3MPa to 0.6MPa, and continues fast flow speed and direction exhaust steam turbine in outlet pipe.Owing to when waste gas flows fast, can form negative pressuren zone in outlet pipe, therefore have the pumping action that the waste gas that makes in the cylinder further reduces in the exhaust ports of cylinder.

Before bottom dead center before 15 °, scavenging air valve is in closed condition basically always in piston arrives.Therefore before bottom dead center 45 ° the time,, still there is not gas to enter cylinder in piston arrives from scavenging port though at this moment scavenging port is opened yet.

When piston reaches before bottom dead center 15 °,, also make simultaneously to be in certain negative pressure in the cylinder because the pumping action that the outlet pipe dynamic effect produces makes the waste gas in the cylinder reduce to lower degree.This moment exhaust valve closure, therefore just with the exhaust close of cylinder.

In the pent while of relief opening, scavenging air valve is opened.Pressurized air is through after the Flow-rate adjustment of scavenging air valve, and just the pressure of residual exhaust gases enters cylinder in the cylinder to be higher than.When the compressed-air actuated pressure that produces when the design gas compressor can reach 0.2MPa, piston arrives after bottom dead center 45 ° close scavenging port before, the pressure in the cylinder also can approach this pressure under the regulating action of scavenging air valve.

When 15 ° when closing relief opening Before Bottom Dead Center of outlet valves, electric injection system sprays a small amount of vaporific gasoline for the first time in the cylinder, and forming air fuel ratio with the air that enters cylinder rapidly is the thin combustible gas of 25-50.Because gasoline gasifies in cylinder, so have the effect that reduces the residual exhaust gases temperature.

Since relief opening prior to scavenging port Before Bottom Dead Center 15 ° locate just to close, therefore, when piston at 45 ° when closing scavenging port after bottom dead center, from then on compression stroke just begins.

After piston had been closed scavenging port, and then scavenging air valve was cutting out about 50 ° after bottom dead center.Its objective is in order to reduce pressurized air flows into crankcase from the slit between piston and the cylinder wall influx.Crankcase is provided with the suction port that conduit leads to gas compressor, so that the little air and a small amount of combustible gas brought into of piston gas blowby that flow into wherein are able to reuse.

When piston after bottom dead center 45 ° close scavenging port, soon, the inner cylinder electric controlled direct spray system began to provide the stratified charge desired oil spout of burning for cylinder after compression stroke began.At this moment oil spout is oil spout for the second time.

Because the interior residual a certain amount of waste gas that has of the cylinder of this two-stroke gas and oil machine, this just in time meets exhaust gas recirculation for the NO that reduces lean combustion _xThe requirement of discharging.

Because scavenging air valve has the function of switching on time and Flow-rate adjustment simultaneously, so, as long as the moment that scavenging air valve is opened advances to before bottom dead center before 15 °, at this moment relief opening is not also closed, therefore enter the pressurized air of cylinder from scavenging port, just can play the effect of scavenging, thereby the waste gas residual quantity in the cylinder is reduced.

Therefore, the exhaust gas inside cylinder recirculation rate of this two-stroke gasoline engine can be controlled easily.

For the Flow-rate adjustment of scavenging air valve, and synchronous with it first time fuel injection quantity and form the fuel injection quantity second time of stratified mixture combustion condition, the scavenging air valve of controlling ER EGR Rate in addition is on-off action on time, all is self-adjusting by automatical control system.And these at first are by people's device of engine speed for a change, and the mechanism that promptly can be described as " throttle " sends and begins after the instruction.

Near piston rose to top dead center, spark plug was lighted denseer inflammable mixture around it, and motor just carries out the stratified mixture combustion work done.

Crossed about 60 ° of atdc when piston, outlet valve is opened once more, for exhaust is prepared.

Two, the start mode of motor

After opening manual starting switch, a motor is when driving the bent axle rotation, and another motor drives blowdown turbocharging system is worked.At this moment automatical control system is in the engine start program.Therefore scavenging air valve was opened before exhaust close, entered the pressurized air of cylinder, and waste gas residual in the cylinder or air are discharged.

Locate for 15 ° Before Bottom Dead Center, outlet valve with exhaust close after, the primary fuel injection quantity of automatical control system height when running well is so that the air fuel ratio of the combustible gas that forms in the cylinder reduces.After compression stroke began, the start-up sequence oil spout of setting was for the second time pressed by the in-cylinder direct injection system, thereby motor is started smoothly.

Three, conclusion

Compare with existing EFI two-stroke gasoline engine, supercharging of this inner cylinder electric controlled direct spray type and outlet valve formula two-stroke gasoline engine, the advantage or the good effect that have have:

1, can satisfy the desired tangent condition of layering lean combustion.And existing EFI two-stroke gasoline engine can't be realized underpressure layered burning effectively.

2, relief opening is closed prior to scavenging port.Therefore at 45 ° after bottom dead center, compression stroke just begins to carry out.This effective compression stroke than existing EFI two-stroke gasoline engine shifts to an earlier date.Simultaneously, owing to have pressurization system, so before compression stroke begins, the pressure in the cylinder just can be higher than and has the EFI two-stroke gasoline engine now.So the power per liter of motor also can surpass existing EFI two-stroke gasoline engine.

3,, therefore adopt splash lubrication without crankcase scavenging.This has also solved some EFI two-stroke gasoline engine and also has been subjected to crankcase scavenging to limit the problem of the insufficient lubrication that is caused.

4, adopt pressure breathing, fully air inlet is so only establish scavenging port at the relief opening offside.Therefore the cylinder of multicylinder engine is arranged the same with four stroke engine.And existing EFI two-stroke gasoline engine, because also must there be scavenging port the cylinder both sides, so the arrangement of multi-cylinder is comparatively complicated.

Simplified as long as 5 will have the inner cylinder electric controlled direct spray four-stroke gasoline engine now, just can use the equipment of producing the in-cylinder direct injection four-stroke gasoline engine, produce this simple in structure, running steadily, can satisfy strict Abgasgesetz, power per liter can reach the two-stroke gasoline engine of four-stroke gasoline engine twice.

Four, description of drawings

Accompanying drawing is a schematic representation.

Claims

For supercharging of inner cylinder electric controlled direct spray type and outlet valve formula two-stroke gasoline engine, this patent of invention needs the scope of request patent protection to be: the basic structure of this motor and principle.

Main points are:

Motor has the inner cylinder electric controlled direct spray system.Has blowdown turbocharging system.Outlet valve is housed.Relief opening and scavenging port are all in the piston lower dead center on one side.Relief opening Before Bottom Dead Center 70 ° open; Scavenging port Before Bottom Dead Center 45 ° open.

Before putting 15 ° before ending under the piston arrives, scavenging air valve can be in closed condition always.

Point is located for 15 ° before ending under the piston arrives, and exhaust valve closure is about to exhaust close; Scavenging air valve is opened simultaneously, and pressurized air enters the vaporific gasoline that cylinder and electric injection system spray for the first time and forms thin combustible gas.

Scavenging air valve has simultaneously on time and to open and close and flow regulating function, can be at the exhaust close front opening, and therefore ER EGR Rate in the control cylinder easily.

The oil spout second time of inner cylinder electric controlled direct spray system can make motor realize the layering lean combustion.

Outlet valve is After Top Center opened about 60 °.