JPS5963321A - Supercharging type multiple cylinder internal-combustion engine - Google Patents

Abstract

PURPOSE:To provide strong swirl in a combustion cylinder, by introducing a part of compressed air in a supercharging cylinder to a suction port in the combustion cylinder at a low load area without supplying fuel. CONSTITUTION:Pressurized air sucked from an air cleaner 19 to the second cylinder 3 and compressed therein is alternately sucked into the first cylinder 2 and the third cylinder 4. When an opening degree of a throttle valve 23 in a carburetor 24 is large, pressure differential across the throttle valve 23 is small, and accordingly pressurized air in a surge tank 21 is almost never discharged from discharge ports 17 and 18. On the other hand, when the opening degree of the throttle valve 23 is small, the pressure differential across the valve 23 is large, and accordingly a part of the pressurized air in the surge tank 21 is discharged through the discharged ports 17 and 18 to intake manifolds 7 and 8 without being passed through the carburetor 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-cylinder internal combustion engine in which some of the cylinders are used for supercharging other combustion cylinders.

In this way, a multi-cylinder engine in which some of the cylinders in the number of cylinders are used as supercharging cylinders for combustion cylinders in all cylinders,
This has been proposed in Japanese Patent Application Laid-open No. 7242, Japanese Patent Application Laid-Open No. 51-914163, and Japanese Patent Application Laid-Open No. 52-76517, but these prior art methods use all the air-fuel mixture from the air and container once for supercharging. Since it is sent to the cylinder for compression and then supplied to the combustion cylinder of the tanochi pond, there is a delay in the supply of fuel to the combustion cylinder when the engine accelerates, and when the engine decreases, the force of the fuel to the combustion cylinder is reduced. Since the engine start-up delay is large, the engine response is poor, and since there is a delay in the flow of the air-fuel mixture into the combustion cylinder when starting the engine, there is a significant engine start-up delay. Moreover, when the engine temperature is low or the intake air amount is low, fuel tends to adhere to the inner wall surface of the supercharging cylinder due to the cage, and this adhering fuel is transferred from the sliding gap between the outer periphery of the cylinder and the JJJ to the bottom. The so-called oil leakage occurs in the classif case.

The present invention provides a multi-cylinder internal combustion engine in which some of the plurality of cylinders are used as supercharging cylinders for other combustion cylinders as described above, and the intake air from the intake air cleaner is supplied first. The fuel t1 is prevented from entering the supercharging cylinder by compressing the compressed air into the supercharging cylinder, and then introducing this compressed air into the combustion cylinder after passing through the fuel supply device. In addition to preventing oil dilution, this also prevents problems caused by fuel supply delays and fuel type cut-off delays. By guiding a portion of the compressed air in the cylinder to the intake boat in the combustion cylinder and forming a swirl inside the combustion cylinder without supplying baked stones, the engine improves the no-liff resistance in the low load range. The aim is to increase charging efficiency, improve output and fuel efficiency.

The following describes an embodiment in which the present invention is applied to a three-cylinder engine that uses a throttle valve with a throttle valve as a fuel supply device. This shows a three-cylinder engine in which cylinder (4) is a 4-cycle combustion cylinder and second cylinder (3) is a two-stroke supercharging cylinder.The first and third cylinders (21+4
+ has an intake valve +5] Intake port with +6+ (7) +
Exhaust bow with 81 and exhaust valve (9) (river) 1- fill
(121 and 2nd cylinder (3) have a back valve type suction valve ↑ (13) with a suction valve (141 and a check valve type discharge JP f15 + discharge valve 1-feel), respectively. Eh, 1st cylinder (2) and 3rd cylinder (4)
-:, I moves up and down at the same time and in the same phase, but the second cylinder (
3) The histonia of the first and third cylinders are shifted by 180 degrees in cranic angle so that they move up and down in the exact opposite direction to the histosis of the first and third cylinders, while the first cylinder (2) and the third cylinder (4) are @
The firing order is shifted by 360 degrees in crank angle so that the first cylinder (2) is on the explosion stroke and the third cylinder (4) is on the intake stroke, and during the first compression stroke of the second cylinder (3), the third cylinder is on the intake stroke. The cylinder (4) is set to be in the intake stroke, and the first cylinder (2) is set to be in the intake stroke when the second cylinder (3) is in the next compression stroke. In other words, the mass of the reciprocating part and the mass of the rotating part in the first cylinder (2) and the third cylinder (4) are the same, and the mass of the reciprocating part in the second cylinder (3) located in the middle is the same. And the mass for the rotational movement tsqs is set to approximately twice the mass of the reciprocating movement part and the mass of the rotational movement part of the candy cylinder hanging first cylinder (2) or 1l-1: third cylinder (4) By doing so, it is configured to maintain balance with respect to reciprocating mass and rotating mass.

Historically, the first cylinder (2) and the third cylinder (4) are provided with ejection holes t171 +181, respectively, which communicate with the intake bows 1- +71 +8+.
The injection opening into the intake port t-+7+ +8+ of the small output (1η(18)) is located at the approximately rear side of the intake valve +51 (6) at the intake port +7+ +81 and the cylinder (21+4).
In other words, the flow from the outlet opening into the intake boat +71 to +81 is directed in such a direction as to swirl in the intake port and in the cylinder.

t1q+:j An air cleaner for suction a, which connects the air cleaner (191) to the second cylinder (3) via the passage (20).
) is connected to the suction hoard (14) of the second cylinder (3
) of the discharge bow 1-
1) f: The intake air intake hole (7) of the first cylinder (2) and the third cylinder (4) are
), and the intake passage (22) has a carburetor (24) with a throttle valve (%) on the downstream side of the surge tank 121), parallel to the first and third cylinders.
and furthermore, the first and third cylinders (114 output f171 +181 (!:
Sir';evening'y'7 [2+17! : 'l: 通K [251 (2f'il k) is connected via.

In addition, surge tank! 211 has the corresponding surge voltage 1
A pressure regulating valve (27) is provided to adjust the boost pressure by releasing the boost pressure to the atmosphere when the boost pressure in the cylinder 21 exceeds a certain pressure.
2) Exhaust bow 1- fill 02 at +41]
An exhaust manifold (28) is connected to the exhaust manifold (28).

In this configuration, the first compression stroke of the second cylinder (3) is ! The third cylinder (4) is on the intake stroke, and the second cylinder (3)
) During the next compression stroke, the first cylinder (2) is in the intake stroke, so pressurized air is drawn into the second cylinder (3) from the air cleaner (19) and compressed in the second cylinder (3). The air is alternately taken into the first cylinder (2) (!: third cylinder (4), and in this case, the carburetor (24) that supplies fuel to the pressurized air is used for supercharging. 2nd cylinder for (
3) By installing it on the downstream side, the Qihi device (2)
The fuel PI supplied from 4 (24
It is sent to the first cylinder (2) and third cylinder (4) for combustion without passing through 1k.

Then, the pressurized air in the throttle valve in the carburetor (24) (when the opening degree of the sign is large, the pressure difference before and after the throttle valve Cl5i is small, so the pressurized air in the surge tank 1) is ejected into the surge tank 1- +17) f1g+ However, when the opening time of the throttle valve 1231 is small, the 11° force difference before and after it is large, so the conditioned air in the negative part of the surge valve (21) flows into the carburetor (24). ) will be ejected from the ejection hole 1-17+ +181 into the intake manifold [7) +8j,
This amount of ejection increases as the flow rate of the throttle J↑(c) becomes smaller, so in the low load range where the opening of the throttle valve is small, the pressurized air ejected from the ejection bow 1-〇η(18) A strong swirling flow is given in the intake hole 1-+7) (8) and the cylinder f2)+4), and as the ignition combustion and dawn become better and the ignition performance improves, the jet flow becomes weaker. This makes it possible to overcome the negative effects caused by the swirling flow in the intake boats and cylinders becoming too strong in a high load range where the throttle valve opening is large.

In general, in an internal combustion engine, both valves are open at the same time between the intake valve 1lll and the exhaust valve closing.
-Rad section mJ exists, and a part of the intake air mixture from the intake hoard will blow through to the exhaust boat due to this oat''+-RA 1 section.
However, according to the present invention, there is a jet hoard (171) in the intake boats (7) and (8) even when the intake valve [5] f6+ is closed.
Pressurized air is supplied from (1, 8), and intake -R (5)
Near the back of (6), only the highest Qi has accumulated,
When the intake valve opens, the air accumulated near the back of the intake valve enters the cylinder, and then the air-fuel mixture enters the cylinder.
In the interval from the opening of the intake valve to the closing position of the exhaust valve, the blowing of the air-fuel mixture to the exhaust boat side can be reduced by the amount of air that flows into the cylinder first, and the injection hoard t171 +18+ intake boat (7)
(8) When opening into the intake valve f5) as shown in Fig. 3, it opens at the 100-discharge surface of [6), and connects the IVM opening of 181 to the intake valve +5.
It is also possible to open and close (6) and 1ij1 o'clock, so even outside this field, when intake valve f5) +61 opens, pressurized air from jet boat (18) flows out and enters the cylinder Since the inflow of air precedes the inflow of the mixture, it is possible to reduce the blow-by of the mixture in the Oharatsu section.

Note that in the above embodiment, the central second cylinder (3) of a three-cylinder engine was used as a supercharging cylinder, but the first cylinder (3) was used as a supercharging cylinder.
2) Or, the third cylinder (4) can be used as a supercharging cylinder, and the pond cylinder can be used as a full combustion cylinder. Needless to say, it can be applied to Although the above embodiment was applied to a vaporization type internal combustion engine, it is needless to say that it can be similarly applied to a fuel injection type internal combustion engine. It suffices to provide only a fuel tank and a fuel tank downstream thereof.

In summary, the present invention provides for some cylinders among a plurality of cylinders to
In a multi-cylinder internal combustion engine, the air cleaner is connected to the intake port of the supercharging cylinder, and the discharge port of the supercharging cylinder is connected to the supercharging cylinder connected to the other combustion cylinder.
A throttle valve and a differential supply device are provided in the intake passage leading from the combustion cylinder to the combustion cylinder. This system is equipped with an ejection hoard that allows the fuel to be ejected to the combustion cylinder without passing through the supercharging cylinder, so the fuel can be supplied by passing through the supercharging cylinder. There is no delay or cut delay, and the response to engine adjustment is significantly improved. There isn't.

Furthermore, the present invention provides the combustion cylinder with an 11-port boat that injects pressurized air upstream from the throttle valve into the intake ports 1 to 1 of the cylinder.
The intake swirl in the combustion cylinder can be made stronger as the load decreases without making it unnecessarily strong in the high negative range of the engine, increasing knock resistance and charging efficiency in the low load range, reducing output and fuel efficiency. In addition, it is possible to reduce the blow-through of the intake air-fuel mixture to the air intake air hoard, and it has the effect of making the exhaust residue more creasey.

[Brief explanation of drawings]

Drawing 1 shows an embodiment of the present invention, and Fig. 1 is a plan view;
Fig. 12 shows an enlarged view of Fig. II-II, and Fig. 3 shows another real Qilj, for example.・This is an enlarged 119+ diagram of the same part as Figure 2. (1)...Mechanical rules, +2) +31 [4)...Cylinder,
(19)... Air cleaner, 120)... Passage, (
221... Intake passage, (24)... Carburetor, (2:
+1...Storm, 171 +181...Gushing boat.

Claims (1)

[Scope of Claims] [1] In a multi-cylinder internal combustion engine in which some of the plurality of cylinders are configured as supercharging cylinders for other combustion cylinders, an air cleaner is provided in the intake boat of the supercharging cylinder. On the other hand, a slot I+j square and a type supply system are provided in the intake passage from the discharge boat of the supercharging cylinder to the combustion cylinder, and the combustion cylinder is provided with a 1. A supercharged multi-cylinder internal combustion engine, characterized in that a jet boat is provided to jet pressurized air from the side into an intake bowl L- of the cylinder.