RU2241128C2 - Device for acoustic supercharging of internal combustion engine - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: device for acoustic (wave) supercharging of internal combustion engine contains intake pipeline, branch pipes laid to cylinders and sound radiator. At least one sound radiator is built into intake pipeline, being connected with electronic control unit and it radiates sound into intake pipeline space when charge of gas-air mixture gets into engine cylinder at intake or at rarefaction near exhaust valve at end of discharge when valves close. Additional valve is installed in cylinder head channel before intake valve whose position is fixed by sensor connected with electronic control unit. Said additional valve cracks at beginning of intake cycle and then opens fully. Number and arrangement of sound source(s) are determined experimentally depending of particular intake system. Sound source can be made in form of loudspeaker.

EFFECT: improved efficiency of supercharging of internal combustion engine.

3 cl, 3 dwg

Description

The invention relates to mechanical engineering, in particular to engine building, mainly to the device of the intake systems of internal combustion engines.

A device is known for acoustic (wave) pressurization of an internal combustion engine, comprising an inlet pipe and nozzles leading to the cylinders, a sound emitter (see GB 2203488, publ. 19.10.1988). This device is selected as the closest equivalent.

The closest analogue does not provide sufficient boost efficiency.

The technical task of the invention is to increase the efficiency of pressurization of an internal combustion engine.

The technical problem is solved by a device for acoustic (wave) pressurization of an internal combustion engine, containing an inlet pipe and pipes leading to the cylinders, a sound emitter. According to the invention, at least one sound emitter is mounted in the inlet pipe, connected to the electronic control unit and emits sound into the space of the inlet pipe when a gas-air mixture enters the engine cylinder at the inlet or at a vacuum near the exhaust valve at the end of the exhaust process at the time of shutdown valves, in the channel of the cylinder head in front of the inlet valve an additional valve is installed, the position of which is fixed by a sensor connected to the electronic control unit, at the beginning of the intake stroke, the additional valve only opens slightly and then opens completely.

The quantity and location of the sound source (s) is determined experimentally for this particular intake system. The sound source may be made in the form of a speaker.

Drawings illustrating the invention:

figure 1 - General diagram of the intake system of an internal combustion engine containing an acoustic pressurization device;

figure 2 - the possible location of the device of acoustic boost in the intake manifold;

figure 3 is a graph illustrating the effect of increasing the pressure of the gas-air mixture when filled as a result of interference of pressure waves of the air flow and sound pressure generated by the device of acoustic pressurization.

The device of acoustic pressurization of the internal combustion engine contains an inlet pipe 1, nozzles 2-5 leading to valves 6 of the cylinders 7. At least one sound emitter (speaker) 8 is connected to the intake pipe 1, connected to the electronic control unit 9 and emitting sound into intake manifold space. In the channel of the cylinder head in front of the intake valve 6, an additional valve 10 is installed, the position of which is fixed by a sensor 11 connected to the electronic control unit.

The device operates as follows.

At the beginning of the intake stroke, the air-gas mixture flows through the intake pipe 1 and through the intake valve 6 and the additional valve 10 enters the cylinder 7 of the internal combustion engine. In this case, the pressure and flow rate vary in time and length of the pipeline. The sound emitter 8 emits sound into the space of the inlet pipe 1 with the necessary amplitude-frequency characteristics that are generated by the electronic control unit 9. As a result, due to interference of the pressure waves of the main air flow entering the intake system and the sound pressure generated by the acoustic pressurization device, the effect of increasing the pressure of the gas stream upon receipt of the charge of the gas-air mixture in the engine cylinder.

The operation of the additional valve is controlled by the electronic unit 9, which optimizes the moment the valve opens completely and takes into account the angle of the engine throttle α.

At the beginning of the intake stroke, the additional valve 10 only slightly opens, as a result of which a significant vacuum occurs in the cylinder. Then it opens completely, and the sound emitter 8 creates additional sound pressure. Gas flow with high speed and sound pressure rushes into the cylinder, where it is inhibited, providing acoustic boost.

The acoustic pressurization device can be pre-configured based on the geometric characteristics of the internal combustion engine gas exchange systems, for example, the dimensions of the internal diameter and length of the nozzles. Different types of intake systems are also taken into account:

- with branched nozzles for one inlet channel or for combined channels of adjacent cylinders;

- with individual short branch pipes for each cylinder attached to a common receiver;

- with individual pipes combined in a common receiver;

- with branched nozzles uniting individual pipes of different lengths, in which the intake processes are shifted at equal intervals, etc.

Effective operation of the device is achieved with the optimal number and location of the source (s) of sound, with the optimal length and cross-section of the pipelines.

The optimal length of the pipeline is determined by the timely arrival of a compression or vacuum wave before closing the valve, respectively, for the intake and exhaust systems. Timely arrival of a wave depends on the ratio of the speed of its propagation, the length of the pipeline, the duration of the valve opening. The combined influence of these factors on the arrival of the wave is taken into account by the Strouhal criterion Sh.

EFFECT: invention makes it possible to increase boost efficiency, increase engine power indicators, reduce exhaust gas toxicity and can be a useful contribution to the creation of progressive vehicles with improved operational and environmental qualities.

Claims (3)

1. Device for acoustic (wave) pressurization of an internal combustion engine, comprising an inlet pipe and nozzles leading to the cylinders, a sound emitter, characterized in that at least one sound emitter is mounted in the intake manifold, connected to the electronic control unit and emits sound into the space of the inlet pipeline when the charge of the gas-air mixture enters the engine cylinder at the inlet, or during rarefaction near the exhaust valve at the end of the exhaust process at the time of shutting off the valves, in on the side of the cylinder head, an additional valve is installed in front of the inlet valve, the position of which is fixed by a sensor connected to the electronic control unit, while at the beginning of the intake stroke, the additional valve only opens slightly and then opens completely. 2. The device according to claim 1, characterized in that the number and location of the sound source (s) is determined experimentally for this particular intake system. 3. The device according to claim 1, characterized in that the sound source is made in the form of a loudspeaker.

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