SU379776A1 - INLET ENGINE INTERNAL - Google Patents

Description

one

This invention relates to the design of intake systems for internal combustion engines.

Known intake systems for internal combustion engines include a manifold connected by a pipe to an air cleaner and a Helmholtz resonator.

The purpose of the invention is to increase the filling ratio of the engine.

This is achieved in that the Helmholtz resonator is connected to the pipeline at a distance from its connection to the collector, which is equal to the resonant length of the pipe pipe.

The figure shows schematically the proposed intake system.

The engine intake system contains a manifold 1, which connects several cylinders 2 (is absent in a single-cylinder engine), an air cleaner 3 connected to the collector by a conduit 4, and a Helmholtz resonator 5.

The pipeline section between the collector and the Helmholtz resonator has a length equal to the resonant length for the frequency of disturbing oscillations from the joint operation of all cylinders connected by the collector.

The resonator must also be tuned to this frequency. For this, the length of the inlet 6 of the resonator 5 is chosen in accordance with the ratio

Zv- y

1 22.5 - - / Ldv / Kr

where / p - the length of the inlet of the resonator, m;

p is the cross-sectional area of the nozzle; R2 Vp is the cavity volume, L43;

Izb - speed of sound propagation,

MJceK; Yadv - the number of revolutions of the crankshaft

engine rpm;

i is the number of cylinders connected by a manifold (); t - the number of strokes of the engine.

When the engine is operating, the air oscillations created by the inlet to the individual cylinders propagate through the connecting pipe 4. When it reaches the Helmholtz resonator 5, the pressure waves are reflected from the inlet section of the nozzle and move back to the valves of the cylinders 2.

Tuning the resonator to the frequency of forced oscillations contributes to an increase in the amplitude of the reflected wave and a change in its phase by 180 °. Performing a resonant pipeline

the length of the section between the collector and the resonator leads to the fact that the reflected pressure waves approach the inlet valves 360 ° after the start of the cycle. Here they are combined in one phase with direct pressure waves, increasing the amplitude of oscillations. Since the maximum positive air pressure upstream of the valves coincides with the moment they are closed, the filling of the cylinders with air increases.

Subject invention

The internal combustion engine intake system comprising a manifold connected by pipeline to an air cleaner and a Helmholtz resonator, characterized in that, in order to increase the filling ratio, the resonator is connected to the pipeline at a distance from its connection to the collector equal to the resonant length of the pipeline.

 D

x /