SU658304A1 - Internal combustion engine fuel supply system - Google Patents

Description

one

The invention relates to the field of mechanical engineering and can be used in internal combustion engines, in particular, in its power systems.

A supply system for internal combustion engines is known, comprising a carburetor equipped with a primary mixing chamber, having an idling device and communicating with the cylinder through the first inlet, and a secondary mixing chamber communicating with the cylinder through the second inlet 1.

However, in such power supply systems, there is a HIGH emission of TOXIC substances with exhaust gases and an unproductive consumption of fuel at the forced, idle speed as a result of incomplete combustion of fuel.

The aim of the invention is to reduce the content of toxic substances in exhaust gases when operating at the forced idling mode by reducing entrainment of the fuel film to the cylinder from the wall of the first inlet pipe.

For this, the second inlet is connected to a source of non-combustible gas through

the channel in which the stop valve is located with the control mechanism.

The control mechanism can be connected to the idling device.

FIG. Figure 1 shows schematically the proposed power supply system, a general view; in fig. 2 is a flow chart of the flow of the mixture during the intake process, in a cylinder with one inlet valve; in fig. 3 is a diagram of the direction of flow of the mixture during the inlet to the cylinder with two inlet valves; in fig. 4 is a diagram of the control mechanism connected to the idling device.

The power supply system of the internal combustion engine contains a carburetor 1 with a primary mixing gauge 2 and an idling device, and a secondary mixing chamber 3. The primary mixing chamber 2 communicates through a first inlet 4 with a cylinder 5. The secondary mixing chamber 3 communicates through a second an inlet 6 with a cylinder 5. The system also contains a source of non-combustible gas, which can be used as atmospheric air supplied through channel 7 through a shut-off element 8 with a control mechanism 9, or in Pop gases supplied no channel 10 through shut off device 11 to the control mechanism 12.

The idling device contains a shut-off element 13 connected to the control unit 14 (FIG. 4) and placed in a channel 15 communicated with the throttle space of the primary mixing chamber 2. The control mechanism 9 or 12 is connected to the control unit 14.

The first inlet 4 and the second inlet 6 can be combined into a common intake manifold 16 and separated therein by a baffle 17 extending to the valve seat 18. The baffle 17 has a shaped portion 19 for tangentially supplying fuel-air mixtures from the primary chamber 2 and the secondary chamber 3 into the cylinder 5. The first inlet 4 of the second inlet 6 can be connected to the cylinder 5 through separate inlet valves 20 and 21 (Fig. 3). The first inlet 4 may have a heated section 22, and the second inlet 6 - a cooled section 23.

Shown as a measure in FIG. 1, an automatic opening 24 of the throttle valve 25 of the secondary chamber 3 of the carburetor consists of a shaft 26 connected to a movable partition 27, a pneumatic box 28, one cavity 29 of which is connected to the diffusers 30 and 31 of the carburetor, and the other cavity 32 with the atmosphere. The throttle valve 25 of the secondary chamber 3 can be connected to the axis of the throttle valve 33 of the primary chamber 2 by the system of levers 34.

When the power supply system is operating at self-idling mode, the channel 15 for supplying the mixture to the primary mixing chamber 2 is open, and the shut-off member 8 of the channel 7 for supplying non-combustible gases is closed. When the crankshaft rotation speed increases by approximately 300-800 rpm above the minimum steady idle speed) and with the throttle valve 33 of the primary chamber closed (engine braking mode, for example, when driving downhill), the stop valve 13 of the idling device closes channel 15 , stopping the supply of the mixture to the primary mixing chamber 2. In this case, the control mechanism 9, acting on the shut-off member 8, opens the channel 10, providing the supply of non-combustible gases, for example air, to the second inlet 6.

When reducing the number of revolutions of forced idling to a predetermined value (approximately 200-600 rpm above the minimum idling speed), the stop valve 13 of the idling device opens channel 15, thereby restoring the flow of working mixture to the primary mixing chamber 2. At the same time, the shut-off valve authority 8, stopping the flow of non-combustible gases from channel 7 to the second inlet 6.

In the partial load mode, exhaust gases from the exhaust system can be fed into the inlet port 10 to reduce the emission of nitrogen oxides. The proposed power supply system of a gasoline engine provides a reduction in toxic emissions by 30-50%, a decrease in engine oil loss by 40-60%, fuel consumption by an average of 5%, a decrease

0 requirements for octane and an increase in mileage to overhaul. This is achieved by preventing the fuel film from being carried off the walls of the inlets at the forced idling mode, as when testing is carried out by the test drums on the driving cycles of the UNECE Regulations No. 15 and FTP 75 (USA), the engine runs only on the primary mixing chamber and is non-flammable. gases are supplied only to the second inlet 6,

Q through which, when tested, the mixture is not fed into the cylinder. In addition, this effect is achieved due to a decrease in vacuum in the cylinder during the intake stroke, purging it with non-combustible gases, and stopping the supply of fuel in the forced mode.

5 idle.

When working on one primary mixing chamber, the mixing process is improved due to an increase in the speed

the mixture in the intake manifold and the creation of more intense eddies in the cylinder. At the same time, antiknock qualities are improved at low and medium revolutions.

At high speeds and full loads, when the secondary meter is opened using an automatic device, by adjusting the flow direction angles at the cylinder inlet, it is possible to reduce charge vortices and ensure an even distribution of engine mass over the cylinders to improve fuel economy.

Claims (1)

1. A power supply system for an internal combustion engine comprising a carburetor equipped with a primary mixing chamber having an idling device and communicating with the cylinder through the first inlet and a secondary mixing chamber communicating with the cylinder through the second inlet and having a non-combustible gas source the fact that, in order to reduce the content of toxic substances in the exhaust gases when operating at the forced idling mode by reducing the entrainment of the fuel film into the cylinder from the wall of the first usknogo pipe, a second inlet connected to the non-combustible gas source through the channel to a