JPS5936088B2 - ninenkikan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a plurality of cylinders and screws 1 to 1 in each cylinder.
and a pre-combustion chamber each communicating with each main combustion chamber via a nozzle, each of the pre-combustion chambers having an ignition device and an ignition device for a first air-fuel mixture. One valve is provided for entering the pre-combustion chamber, and a second
The present invention relates to an internal combustion engine of a type that supplies an air-fuel mixture of 1 to the main combustion chamber.

As is well known, in order to achieve good ignition, the air-fuel mixture must have a fuel content of 10 to 15 L:fO, but at the same time,
The engine gets maximum power.

On the other hand, relatively lean mixtures, such as those desired in order to reduce the toxic content of the exhaust gas to a very low level, are difficult to ignite.

For this reason, so-called stratified-air engines were developed from internal combustion engines with a pre-combustion chamber.

A rich air-fuel mixture is ignited in the pre-combustion chamber, which generates a flame flow that propagates toward the main combustion chamber, but the flame right ignites the lean mixture that is difficult to ignite in the main combustion chamber. useful for.

As a result, the toxic components in the exhaust gas are significantly reduced and at the same time fuel consumption becomes more economical.

In devices of this type, fuel is fed into the combustion chamber into the intake pipe or directly into the combustion chamber, as is known.

Direct feeding into the combustion chamber is usually carried out via an injector at a suitable discharge pressure, but this requires considerable expenditure.

In addition, this type of direct injector also poses important problems regarding the composition of the air/fuel mixture in the combustion chamber.

The same thing essentially applies to the method of supplying the air-fuel mixture to the main combustion chamber via the engine intake valve and directly injecting it into the pre-combustion chamber.

Internal combustion engines of the type mentioned at the outset, in which fuel is metered for each engine cylinder at one point and a portion of this metered fuel quantity is then branched off and injected into the precombustion chamber via a separate pump. is publicly known.

In this known internal combustion engine, the first fuel metering device and the same IU
It is not necessary to provide a second fuel metering device for each cylinder, which must be operated independently, but a separate pumping device is required.

The object of the invention is to improve an internal combustion engine of the type mentioned in the introduction so that only one fuel metering device is required, without the need for an additional fuel pumping system for each pre-combustion chamber. It is to do so.

The gist of the present invention to solve this problem is that one suction conduit branched from the intake pipe in the upstream region of the engine intake valve of each cylinder is connected to the pre-combustion member 1 of the preceding cylinder in the ignition order. ”, and fuel is stored in the intake pipe prior to each opening stroke of each engine intake valve,
The point is that a portion of the fuel is sucked into the pre-combustion chamber of the ignition advance cylinder via the branch suction conduit during the suction stroke of the piston of the ignition advance cylinder.

The storage of fuel during the planing of the engine intake valve takes place at the appropriate point in time when the intake stroke of the preceding cylinder in the firing sequence is able to draw the appropriate amount into the pre-combustion chamber.

In order to be able to utilize the shift of the flammability limit in the entire characteristic curve range to the lean power mixture region produced in this way, the fuel metering device must be operated by every flammability limit adjustment device. .

In a preferred embodiment of the invention, the entry valve into the precombustion chamber is a flutter valve which is controlled by the pressure in the precombustion chamber, and the flank valve is designed as a plate valve or a reed valve.

Such flutter valves operate with a movable valve body of extremely low mass, which results in extremely precise opening and closing characteristics even up to high rotational speeds, said movable valve body controlling the flow cross section. .

Since a large number of flow ports are used in such flutter valves, the homogeneity of the air/fuel mixture is not adversely affected, but on the contrary, the desired heating and composition of the air/fuel mixture is obtained. Moreover, since the total mass of the flutter valve becomes small and the cooling effect of the sucked air-fuel mixture occurs, overheating is induced which leads to premature ignition of the air-fuel mixture. Not at all.

Next, a practical example of the present invention will be explained in detail with reference to the illustrated embodiment.

A cylinder head 1 of a stratified air supply type (stratified charge combustion type) internal/combustion engine shown in FIG. 1 has a pre-combustion chamber 2, a main combustion chamber 3, and an engine intake valve 4. 5 to main combustion chamber 3
Control communication to.

Furthermore, a seafood plug 6 and a flutter valve 7 are arranged in the pre-combustion chamber 2, and an injection nozzle 8 is opened in the intake pipe 5.

The fuel metered by a fuel metering device (not shown) is
Before the engine intake valve 4 opens, it is stored in a spatial region 10 upstream of the engine intake valve.

A suction conduit 11 branching off from the spatial region 10 leads to the precombustion chamber 2 of the preceding engine cylinder in the firing sequence, in which a settable throttle 12 is arranged.

In other words, the branch intake conduit 13 opening into the illustrated precombustion chamber 2 extends from said spatial region 10 of the intake pipe 5 of the next cylinder to fire in the firing sequence.

The flutter valve consists of a valve seat plate 15, a valve seat body 16, and a disc 17 as a movable valve body.

An ignition passage 19 is arranged between the pre-combustion chamber 2 and the main combustion chamber 3, and the ignition flame is ejected from the pre-combustion chamber 2 into the main combustion chamber 3 via the ignition passage.

In the variant embodiment of the flutter valve 7 and the precombustion chamber 2 shown in FIG. A flutter valve 7 is disposed within the annular chamber 20.

In this case, a ring disk 21 is used as a movable valve body of the flutter valve 7.
is used, and the ring disc includes a connecting bush 22 serving as a valve body and a spark plug holder 2 with a valve seat.
It is movably arranged between 3 and 3.

The four-cylinder internal combustion engine 25 shown in plan view in FIG. 3 operates in the normal firing order, ie, in the order of ■-■-■-■.

The engine cylinders are marked ■ and ■ in Figure 3. Indicated by ■, ■.

The main combustion chamber receives the air/fuel mixture via a branch pipe of the intake pipe 5, into which fuel is injected via an injection nozzle 8 into a spatial region 10 upstream of the engine intake valve. Ru.

One branch suction conduit 11°1 from the spatial region 10 respectively
1', 13.13' are branched.

Therefore, in the present invention, the intake pipe 5 of cylinder (2) of the engine is connected to the pre-combustion chamber of cylinder (2) via a branch suction conduit 13, and the intake pipe of cylinder (2) is connected to the pre-combustion chamber of cylinder (2) via a branch suction conduit 13'. The intake pipe of the cylinder (2) and the cylinder (2) are connected via a branch suction conduit 11 to the precombustion chamber of the cylinder (2), and the intake pipe of the cylinder (2) is connected to the precombustion chamber of the cylinder (2) via a branch suction conduit 11'. There is.

The fuel is injected via a fuel metering device 26, for example a jet pump, into the spatial region 10 upstream of the engine intake valve (not shown).

The internal combustion engine of the present invention operates as follows.

An underpressure is created in the pre-combustion chamber of the ignition lead cylinder as a result of the suction stroke of the piston of this cylinder, which underpressure causes a portion of the pre-stored fuel to flow into the branch suction conduit 11.1.
1', 13, 13' and the flutter valve 7 into the pre-combustion chamber 2. is stored in advance.

Only then is the engine intake valve 4 opened, and the remainder of the pre-stored fuel reaches from the spatial region 10 into the main combustion chamber 3 due to the suction action of the engine cylinders.

The amount of fuel flowing into the pre-combustion chamber 2 is determined by the throttle 12.

As soon as the engine intake valve 4 closes again and the corresponding compression stroke ends in the main combustion chamber 3, the rich air-fuel mixture present in the pre-combustion chamber 2 is ignited by the spark plug 6. The ignition flame ejected from the nozzle of the ignition passage 19 can ignite the lean air-fuel mixture in the main combustion chamber 3.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the engine cylinder head, FIG. 2 is a sectional view of the pre-combustion chamber section in different practical configurations, and FIG. 3 is a schematic diagram showing the arrangement of the suction conduits for a given firing sequence. FIG. 1... Cylinder head, 2... Pre-combustion chamber, 3... Main combustion chamber, 4... Engine intake valve, 5... Intake pipe, 6... Spark plug, 7... Flutter valve, 8... Injection nozzle, 10... Spatial range upstream of intake valve, 11
, 11'...branched suction conduit, 12...
... Throttle, 13.13'... Branched suction conduit, 15... Valve seat plate, 16... Valve receiver is body, 17... Movable Disc as valve body, 19...
...Ignition passage, 20...Annular chamber, 21...
...Ring disk as a movable valve body, 22...
Connection bushing, 23...Spark plug holder, 2
5...Four-cylinder internal combustion engine, 26...Fuel metering device.

Claims (1)

[Scope of Claims] 1. A combustion chamber comprising a plurality of cylinders, a main combustion chamber limited by a piston in each cylinder, and a main combustion chamber communicating with each main combustion chamber through a nozzle, and the pre-combustion chamber. 1 for each
an ignition device as well as a precombustion chamber artificial valve for the first air-fuel mixture, and a second air-fuel mixture via an intake pipe and an engine intake valve communicating the intake pipe with the main combustion chamber. In an internal combustion engine of the type in which the air-fuel mixture is supplied to the main combustion chamber, one intake conduit ILII' branches off from the intake pipe 5 in the spatial region 10 upstream of the engine intake valve 4 of each cylinder. 13, 13' reach the entry valve 7 of the precombustion chamber 2 of the preceding cylinder in the ignition order, and prior to each opening stroke of each intake valve 4, the intake pipe 5 A portion of the fuel is stored in the branch suction conduit 11, 11', 13, into the pre-combustion chamber 2 of the ignition precursor cylinder during the suction stroke of the ignition precursor cylinder.
13'.