JPS5963320A - Supercharging type multiple cylinder internal- combustion engine - Google Patents

Abstract

PURPOSE:To reduce power loss of a supercharging cylinder at a low load area, by introducing suction air from an air cleaner to a fuel supply device at the low load area without passing same through the supercharging cylinder. CONSTITUTION:A bypass valve 24 in a bypass passage 23 is closed at a medium to a high load area where an opening degree of a throttle valve 21 in a carburetor 22 is large, and suction air from an air cleaner 17 is induced into the first cylinder 2. After the suction air is compressed in the first cylinder 2, it is fed through a carburetor 22 to the second cylinder 3 and the third cylinder 4, and accordingly an engine is operated under a supercharged condition. On the other hand, at a large load area where the opening degree of the throttle valve 21 is small, the bypass valve 24 is opened, and therefore the suction air from the air cleaner 17 is fed through the bypass passage 23 and the carburetor 22 to the second cylinder 3 and the third cylinder 4, whereby the engine is operated under a nonsupercharged condition.

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 the S-burning cylinders of music.

In this way, a multi-cylinder engine in which some of the cylinders were used as supercharging cylinders for combustion cylinders in the pond was developed in the 1970s.
Although it has been proposed in Japanese Patent Application Laid-open No. 7242, Japanese Patent Application Laid-Open No. 51-91416, and Japanese Patent Application Laid-Open No. 52-76517, these prior art methods do not allow the air-fuel mixture from the carburetor to be directly transferred to the supercharging cylinder. This is because there is a large delay in the supply of fuel to the combustion cylinders when the engine accelerates, and a large delay in the cut of fuel to the combustion cylinders when the engine decelerates. The response of acceleration and deceleration is poor, and since there is a delay in the inflow of the air-fuel mixture into the combustion cylinder when starting the engine, there is a significant delay in starting the engine. Moreover, when the engine temperature is low or when the engine is operating with a small amount of intake air, fuel tends to adhere to the inner wall surface of the supercharging cylinder, and this adhering fuel is caused by sliding contact with the outer circumferential surface of Hist I-'J. This causes so-called oil leakage that flows from the dynamic clearance into the lower crankcase. Also,
The intake air to the combustion cylinders is always passed through all the supercharging cylinders, and therefore the supercharging cylinders perform compression even in the operating range where the amount of intake air to the combustion cylinders is small. The loss of power of 1 h in the supercharging cylinder is large.

The present invention consists of 2. In the open-cylinder internal combustion engine in which some of the cylinders are used as supercharging cylinders for other combustion cylinders as described above, the intake air from the intake air cleaner is first supercharged. By introducing the compressed air into the combustion cylinder and compressing it, the compressed air is introduced into the combustion cylinder after passing through the classification supply device.This prevents fuel from entering the supercharging cylinder and prevents the oil from entering the cylinder. In addition to preventing problems caused by fuel supply delays and fuel PI force/warning delays, in low load ranges by narrowing down the throttle valve installed in the intake passage, the air cleaner By configuring the system so that all intake air is introduced into the feeder by type without passing through the supercharging cylinders, the supercharging cylinders are run dry in the low load range, and supercharging is performed in the low load range. This reduces power gain and loss in the cylinders.

Hereinafter, the present invention will be described as a fuel supply device using a throttle valve τ1.
To explain an actual example when applied to a 3-cylinder engine using a 3-cylinder carburetor,
and shows a size three-cylinder engine in which the third cylinder (4) is a four-cycle combustion cylinder and the first cylinder (2) is a two-stroke supercharging cylinder, and the second and third cylinders + 3)' +4+ includes intake boat +7+ +81 with intake valve +51 +6) and exhaust boat +111 (12) with exhaust valve +9+ flof.
+ and into the first cylinder (2) (is a check valve type intake valve (13)
) with suction boat + 141 and the same check valve type discharge valve (15)
Eh, the histograms of the second cylinder (3) and the third cylinder (4) move up and down at the same time at the same time, but the histogram of the first cylinder (2)
~n is the histogram of the 2nd Pi and 3rd cylinders 1~-, and the 2nd cylinder (3) and the 3rd cylinder (4) are 180 degrees apart at the Krasif angle so that they move up and down in the exact opposite direction to J. is the second cylinder (
The ignition order is shifted by 360 degrees at the Tarasif angle so that when cylinder 3) is in the explosion stroke, the third cylinder (4) is in the intake stroke, and during the first compression stroke of the first cylinder (2), the third cylinder (4) is in the intake stroke. ) is the intake stroke, and when the next compression stroke of the first cylinder (2), the second
Cylinder (3) is set to be on the intake stroke. In other words, while the mass of the reciprocating part and the mass of the one-rotation part in the second cylinder (3) and the third cylinder (4) are the same, the mass and rotation of the reciprocating part in the first cylinder t2) are the same. Movement) 44 minutes of movement, the cylinder of the song 9 second cylinder (3) or third cylinder (4) reciprocating motion 1 ■ mass and rotation interlocking 1η 5 minutes? By setting the weight to approximately twice that of one weight, it is configured to maintain balance with respect to the reciprocating mass and the rotating mass.

(1η is an air cleaner for intake, and the air cleaner (1η)
71 to the suction port (14) of the first cylinder (2) through the passage (18+k), and the discharge port 1-+161 of the first cylinder (2) to the second cylinder (3) and the third cylinder (3). It is connected to the intake manifold (19) for the intake boats (7) and (8) of the cylinder (4) via an intake passage (20), and the intake passage (20) has a throttle valve located near the intake manifold (19). ↑Ig11 (=l vaporizer (221
Further, the air intake passage (20) is provided with an air conditioner +221.
A bypass passage +2:ll for the first cylinder (2) is provided between the 1:9 upstream side and the passage (18) from the air cleaner device 1, and a bypass passage +2:ll for the first cylinder (2) is provided.
It is equipped with a 7S I-pass valve (241) which is linked to the above-mentioned IHI device (throttle valve 121 in 221) and closes in medium to high load ranges where the engine requires supercharging. 2nd and 3rd cylinder +31 +4
) is connected to the exhaust manifold (25j) to the exhaust boats +111 to +121.

The smell of this configuration is the vaporizer (slot 1 in 221).
In medium to high load ranges where the opening degree of the valve (21) is large, the bypass valve ('24+ (l-j) in the bypass passage (23)
When the air cleaner is closed, all the intake air from the air cleaner (1η) enters the first cylinder (2), and the compressed air is transferred to the second cylinder (3) and third cylinder through the air cleaner [221]. (4), so the engine is operated in a supercharged state. In the load range, the bypass valve (
24) opens, the intake air from the air cleaner (17) flows from the bypass passage (2, 31) to the ignition device (22).
1 to the second cylinder (3) and third cylinder (4), and the engine is operated in a non-supercharged state, and when operating in this non-supercharged state, the first Cylinder (2)
The cylinder only supplies and discharges a small amount of air, but does not function as a supercharger, and is in a state of dry operation, and only a small amount of the air that is supplied and discharged from the first cylinder (2) is used. Part of the air will be mixed with the air to the carburetor (221), and the rest will be sucked into the first cylinder (2).

In both the tω feeding and non-supercharging operating ranges, the intake air to the second cylinder (3) and the third cylinder j4) is supplied to the carburetor installed downstream from the first cylinder (2). (221
Since the fuel is supplied by the carburetor (221), it is introduced into the second cylinder (3) and the third cylinder (4) without passing through the first cylinder (2) for supercharging. It will be done.

Note that the above embodiment is for the first cylinder (2) in a three-cylinder engine.
In this case, the second cylinder (3) or the third cylinder (4) may be used as the supercharging cylinder, and the cylinder in the song may be used as the combustion cylinder. It is a matter of course that the present invention can be similarly applied to a multi-cylinder engine with 6 cylinders or 6 cylinders. Although the above embodiment was applied to a carburetor type internal combustion engine, it is not to say that it can also be applied to a fuel injection type internal combustion engine. It is sufficient to provide only a fuel injection nozzle on the downstream side of the fuel injection nozzle.

As described above, the present invention allows some of the plurality of cylinders to
In a multi-cylinder internal combustion engine configured as a supercharging cylinder for a combustion cylinder, an air cleaner is connected to the intake boat I of the supercharging cylinder via a passage, and a combustion Thrower 1- in the intake passage leading to the cylinder.
A valve and a fuel valve 1 supply device are provided, and an opening J characteristic of the throat sottle valve is small in a portion 1i-7J of the intake passage upstream of the throat sottle valve and the passage from the air cleaner. It is equipped with a bypass means that guides the air from the air cleaner to the fuel supply device, which allows the combustion air from the fuel supply device to be guided to the combustion cylinder without passing through the supercharging cylinder. This eliminates supply delays and power/softening delays due to fuel passing through the supercharging cylinder (responsiveness to engine acceleration/deceleration is significantly improved, and there is no engine startup delay. Moreover, there is no possibility of generating oil pollution in the supercharging cylinder.

The civil engineering invention is to guide the air from the air cleaner to the fuel supply device without passing through the supercharging cylinder when the opening degree of the slot 11) valve is small during non-supercharging; Since the engine is running almost dry, it is possible to reduce the power extinguishing of the supercharging cylinder in the low load range of the engine. , the temperature increases by supplying and discharging the air, which performs the action 1 of heating the intake air from the air cleaner to the fuel co-feeding device, so it has the effect of simultaneously achieving effectively preheating the supply air in the low debt range. .

[Brief explanation of drawings]

The drawing is a plan view showing an embodiment of the present invention. (1)...Engine, +2) +31 [41...Cylinder, (1η...Air cleaner, (]8)...Passage, (
20)... Intake passage, (221... Carburetor, (21
)...throttle well, (2:i+...bypass passage, (241...bypass valve).

Claims (1)

[Claims] (1) In a multi-cylinder internal combustion engine in which some of the cylinders are configured as supercharging cylinders for combustion cylinders in the pond, an air cleaner is connected to the suction port of the supercharging cylinder. On the other hand, a throttle valve and a fuel supply device are provided in the intake passage from the discharge port of the supercharging cylinder to the combustion cylinder, and a throttle valve pxp and a fuel supply device are provided in the intake passage. 7) A bypass means is provided between the passage from the air cleaner and the air cleaner to guide the air from the air cleaner to the fuel supply device when the degree of opening of the D-little valve is small. Supercharged multi-cylinder internal combustion engine.