JPH0723540Y2 - Inertial supercharger for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention divides a plurality of cylinders of a multi-cylinder internal combustion engine into a plurality of cylinder groups in which intake strokes do not overlap, and connects each cylinder group to each cylinder. The exhaust air of each cylinder group is independent of each turbine while the exhaust gas of each cylinder group is connected to the downstream side of each compressor of the exhaust turbocharger provided corresponding to each cylinder group. The present invention relates to the improvement of the inertia supercharger for a multi-cylinder internal combustion engine.

[Prior art]

As an inertial supercharging device for such a multi-cylinder internal combustion engine,
The one shown in Fig. 12 is known (Shokai Sho 60-4718).
Issue).

That is, it is a twin turbocharged engine having six cylinders 1 to 6, and the cylinders whose exhaust flows do not interfere with each other are collected into two groups and are driven by the exhaust pressure. Compressors 8a, 8b connected to
Is connected to the cylinder in the intake stroke. In this way, the exhaust pressure supplied to the turbine is averaged while the intake interference is prevented, and the turbine efficiency is improved. In addition, 17 is an air cleaner and 18 is a muffler.

However, in such an inertial supercharging device for a conventional multi-cylinder internal combustion engine, the collecting portions 15 and 16 of the intake passages 9 to 11 and 12 to 14 connected to the cylinders 1 to 6 are provided for each cylinder group. Since it is connected to the downstream side of the compressor 8a, 8b of the turbocharger, even if the negative pressure wave generated in the intake stroke propagates in the intake passage, the compressor 8a, 8b acts as a throttle and absorbs this negative pressure wave. Therefore, the reflected waves do not propagate to the cylinders 1 to 6. Therefore, in such a conventional inertial supercharging device, there arises a problem that the supercharging cannot be effectively performed by utilizing the inertial effect and the pulsating effect.

Therefore, the present applicant proposes, in Japanese Utility Model Application No. 62-33867, a device in which the collecting portion is connected by a resonance tube. This will be described with reference to FIG. 13 by assigning the same reference numerals to the portions corresponding to FIG.

The intake passage 30 of the engine is connected via an air cleaner 17 to compressors 33 and 34 of two exhaust turbochargers 31 and 32, respectively. The intake passages 35, 36 on the downstream side of the compressors 33, 34 are independently connected to the intake manifolds 37, 38 as a collection portion of the intake passages provided for each cylinder group divided so that the intake strokes do not overlap. ing. Also,
Exhaust manifolds 39, 40 are connected to each cylinder group, and each exhaust manifold 39, 40 is independently connected to turbines 41, 42 connected to the compressors 33, 34. An exhaust passage 43 in which the muffler 18 is interposed is connected to the downstream side of the turbines 41, 42.

Further, the intake manifolds 37 and 38 are connected to each other by a resonance pipe 44. As shown in FIG. 14, as shown in FIG. 14, in the vicinity of the resonance speed a, the volume efficiency ην is drastically increased as shown by the one-dot chain line B1 for an ordinary engine that does not perform inertial intake shown by the solid line A. And the inertial effect is improved. However, as shown in FIGS. 15 and 16,
Pumping loss is small and fuel consumption is good in the high-speed range, but pumping loss increases in the low-speed range near the resonance speed a, which deteriorates fuel consumption (shaded area in Fig. 16) and exerts inertial effect over the entire rotation speed. There is a problem that is not done.

In addition, Japanese Utility Model Laid-Open No. 61-43941 discloses a technique of interposing a valve at the assembly time of each cylinder group, but since the collection tubes are not connected by a resonance tube, the resonance of the assembly is Not available.

[Problems to be solved by the device]

Therefore, an object of the present invention is to provide an inertial supercharging device for an internal combustion engine, which can optimize the resonance of each collecting portion in accordance with the engine speed, thereby effectively exhibiting the inertial effect and improving fuel efficiency. It is in.

[Means for Solving the Problems]

According to the present invention, a plurality of cylinders of a multi-cylinder internal combustion engine are divided into a plurality of cylinder groups whose intake strokes do not overlap, and each cylinder group is formed with an intake passage connected to each cylinder. While connecting each collecting part to the downstream side of each compressor of the exhaust turbocharger provided corresponding to each cylinder group, the inertial supercharging of the multi-cylinder internal combustion engine that independently guides the exhaust gas of each cylinder group to each turbine In the device, control is provided such that the collecting portions of each cylinder group are communicated with each other by a resonance tube, the collecting portions of each cylinder group are communicated with each other by a short-circuit passage having a valve, and the valve is opened in a low speed range and the valve is closed in a high speed range. A unit is provided.

[Explanation of effects]

Therefore, in the low speed range, the valve can be opened to move the resonance rotational speed to the high speed side, thereby reducing the pumping loss in the low speed range and improving the fuel consumption. Also, in the high speed range, the valve is closed and the resonance speed is moved to the low speed side to reduce pumping loss in the high speed range and improve fuel economy. As a result, the inertial effect is exerted over the entire rotational speed range and fuel economy is improved. be able to.

As described above, according to the present invention, the collecting portions that collect the intake passages connected to the respective cylinders are communicated with each other through the resonance pipes, and the valves between them are opened and closed to increase the volume efficiency in the rotation range and to reduce the pumping loss. Can be lowered.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the intake manifolds 37, 38 shown in FIG. 13 are communicated with each other by a resonance pipe 44A, and a short-circuit passage 45 is formed in the resonance pipe 44A. Its short-circuit passage 45
A butterfly valve 46 is interposed in the valve, and a stepping motor 47 is attached to the valve 46 as shown in FIG. The stepping motor 47 is a control unit
Connected to the control unit 50, the engine speed sensor 48
And a rack position sensor 49 for detecting a load are connected.

Therefore, when the valve 46 is opened, the resonance tube 44A is short-circuited midway, the length of the air column of the resonance tube 44A is shortened and the forced vibration is deactivated, and the pressure of the intake manifolds 37 and 38 is reduced as shown in FIG. The vibration characteristic becomes smaller than when the valve 46 is closed (shown by the solid line D) (shown by the chain line E1), and as shown in FIG. 4, the resonance rotational speed a moves to the rotational speed b on the high speed side. To do.

Therefore, the valve 46 is opened in the low speed range, and the valve 46 is opened in the high speed range.
Rotation sensor 48, rack position sensor 49 to close 46
It is controlled by the control unit 50 based on the signal from the. As a result, in FIGS. 4 to 6, the characteristic C is obtained in the low speed range and the characteristic B is obtained in the high speed range, the pumping loss is small, the fuel consumption is improved, and the inertia effect can be exhibited in the entire rotation speed range.

FIG. 7 shows another embodiment of the present invention, in which the intake manifold 3
This is an example in which 7, 38 are directly short-circuited by a short-circuit passage 45A equipped with a valve 46 and the other parts are configured in the same manner as in FIG. In this embodiment, when the valve 46 is opened, the pressure change in the intake manifolds 37 and 38 is almost eliminated as shown in FIG. 8, and the characteristic C is changed to the characteristic A as shown in FIGS. 9 to 11. That is, the characteristics can be made similar to those of an ordinary internal combustion engine that does not perform inertial air supply, and the same operational effects as those in FIG. 1 can be obtained.

As described above, the present invention has the following excellent effects.

(I) Since the resonance pipes communicate between the collecting portions that collect the supply passages connected to the cylinders and the valves are turned on and off, the resonance rotational speed of the collecting portions can be changed.

(Ii) The volume efficiency can be improved in both the low speed region and the high speed region, and the pumping loss can be reduced.

(Iii) As a result, the deterioration of fuel efficiency caused by inertial supercharging can be eliminated and the inertial effect can be exhibited.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part showing an embodiment of the present invention, FIG. 2 is a configuration diagram around a butterfly valve, and FIG. 3 is a vibration characteristic diagram of a pressure in a supply manifold for explaining the operation, FIG. Figures 5 and 6 show the volume efficiency / revolution speed characteristic diagram, pumping loss / revolution speed characteristic diagram, and fuel consumption
In-cylinder injection amount characteristic diagram, FIG. 7 is a configuration diagram of a main part showing another embodiment of the present invention, FIG. 8 is a diagram corresponding to FIG. 3 for explaining the action, FIG. 9, FIG. FIG. 11 is a drawing for explaining the effect, which corresponds to FIG. 4, FIG. 5 and FIG. 6, respectively.
12 and 13 are overall configuration diagrams showing different conventional devices, respectively, and FIGS. 14, 15, and 16 are respectively the fourth diagram.
7 is a drawing corresponding to characteristics A and B in FIGS. 5, 5 and 6. 31,32 …… Exhaust turbocharger, 33,34 …… Compressor, 35,36 …… Intake passage, 37,38 …… Supply manifold, 4
1,42 …… Turbine, 44,44A …… Resonance tube, 46 …… Butterfly valve, 47 …… Stepping motor, 48 …… Engine rotation sensor, 49 …… Rack position sensor, 50 …… Control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02B 37/16

Claims (1)

[Scope of utility model registration request] 1. A plurality of cylinders of a multi-cylinder internal combustion engine are divided into a plurality of cylinder groups whose intake strokes do not overlap,
Each cylinder group is formed with a collecting portion that collects the intake passages connected to each cylinder, and each collecting portion is connected to the downstream side of each compressor of the exhaust turbocharger provided corresponding to each cylinder group. In an inertial supercharger for a multi-cylinder internal combustion engine in which the exhaust gas of each group is independently guided to each turbine, the collecting parts of each cylinder group are connected by a resonance pipe, and a valve is provided between the collecting parts of each cylinder group. An inertial supercharging device for an internal combustion engine, comprising: a control unit that communicates through a passage and opens the valve in a low speed range and closes the valve in a high speed range.