SU1511448A1 - Supply system for ic-engine - Google Patents

Abstract

The invention makes it possible to reduce fuel operating costs and reduce the emission of harmful substances. The mixing chamber 11 is made in the form of a cylinder 18 and a cone-shaped constriction 19 interconnected. Between the fuel channel 9 and the confused section 16 there is a connecting channel 13 equipped with an air nozzle 15. Between the throttle section 6 of the main air channel 4 and section 16 there is a bypass channel 14 Between the fuel metering device 8 and the minimum cross-section 17 of the confused-diffuser section 12, the fuel channel 9 is located. The ratio of the area of sections of the section 12 and the channel 14 at the entrance to the section 16 is made in the range of 0.5-2.0. The channel 14 at the entrance to the cylindrical part of the section 16 is made tangential. Chamber 11 communicates with a small diffuser 5 by means of channel 21. In all modes, fuel is atomized due to the energy of the air flow having a sonic or close to sonic velocity in section 17. In loading modes, additional mixing takes place in diffuser 5 due to high speed through it flow. The fine dispersion of fuel in the throttle nozzle 1, as well as the distribution of the fuel cycle charge throughout the cycle, reduce the uneven distribution of the mixture through the cylinders. 4 hp f-ly, 2 ill.

Description

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four;

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The invention relates to machine building, in particular, to power systems for internal combustion engines.

The aim of the invention is to reduce fuel operating costs and reduce the emission of harmful substances.

FIG. 1 is a schematic diagram of a power supply system for internal combustion engines; in fig. 2 shows section A-A in FIG. one.

The power supply system contains a throttle nozzle 1 with a housing 2, a throttle valve 3, a main air channel 1 with a small diffuser 5, with a rear seat and throttle spaces 6 and 7, respectively, a fuel metering device 8, assembled in the form of an electronically controlled nozzles and a communicating with a small diffuser 5, fuel channel 9s adjusting screw 10, mixing chamber 11, confusion-diffuse section 12, connecting and bypass channels 13 and 14, respectively.

The connecting channel 13 is equipped with an air jet 15 and pa: placed between the fuel channel 9 and confused section 16. Bypass channel 14 is located between the throttle space 6 and confused section 16. Fuel channel 9 is located between the fuel metering device 8 and the minimum cross section 17 of confusing-diffuser section 12 The mixing chamber 11 is made as conjugated .UHt,. Lindra 18 and cone; Eugene 19.

The volume of fuel channel 9 is equal to 2–4 volumes of the minimum cyclic fuel charge.

The bypass channel 14 at the inlet 20 to the cylindrical part 18 of the mixing chamber 11 is made tangential. The mixing chamber 11 communicates with a small diffuser 5, for example, by means of a channel 21.

When the engine is idling, the air enters through the bypass channel 14, confused-diffuser section 12, equipped with an adjusting screw 10, through the mixing chamber 11 into the machine head diffuser 5.

The ratio of the cross-section confused area 16, adjustable screw 10, and the previous section;

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5 0 5

0 5

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in the range of 0.5-2.0, which ensures optimal sensitivity of the adjustable parameter, for example, the engine speed.

In the minimum cross section 17 of the confused-diffuser section 12, the air has a maximum speed close to the local speed of sound, since the idle is characterized by a supercritical pressure drop. The fuel enters the confused-diffuse area 12, and the dispersion occurs under the influence of the air flow with the maximum use of its energy.

When switching to load modes, the vacuum in throttle space 7 in a certain range of loads is still supercritical. At high loads, due to the increase in air flow, the vacuum in the small diffuser 5 increases and a large vacuum remains in the minimum cross section 17, and therefore

and close to sound speeds of air in this section 17.

Fuel is dispensed into fuel channel 9, and at low loads, when the injection duration is much less than the engine camshaft revolution time, the fuel enters the almost empty channel 9 and the flow into the bypass channel 14 takes place as an emulsion. The diameter of the nozzle 15 is chosen so that the pressure drop over the channel length is substantially less than the injection pressure and the emulsion velocity in the channel is in the range of 0.05-0.2 m / s. Due to the fact that the volume of the fuel channel 9 is equal to 2-4 volumes of the minimum cycle charge, the resulting emulsion speed in channel 9 reduces the discreteness of the fuel supply to the mixing zone with air at low and medium loads. At high loads, an increase in the dose of fuel, and consequently, the duration of the injection, is accompanied by a lawful increase in the uniformity of fuel delivery over time.

The increase in the volume of the fuel channel 9 above the specified increases the uniformity of the mixture, but at the same time this leads to an increase in the inertia of the process of fuel supply to the engine.

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An additional effect on the nature of the fuel flow into the air to increase the uniformity of the mixture composition over time is carried out in the chamber 11, where the air and flippant make a rotational movement, increasing the time of mutual contact on the scale of one period of injection, which ensures an almost constant composition of the mixture during the time between the individual injections of fuel dispenser. When the mixing chamber 11 is coaxially arranged in the narrowing of the air path, there is an intensive distribution of fuel over the cross section of the air path, which ensures even distribution of fuel in a multi-cylinder engine with a decrease in fuel consumption and exhaust gas toxicity.

Thus, in all modes, fuel disintegration occurs due to the energy of the air flow having a sonic or close to sonic velocity in section 17. In load modes, additional mixing takes place in the small diffuser 5 due to the high speed of the air flow passing through it. The fine dispersion of the mixture formed in the throttle nozzle 1, as well as the distribution of the fuel cycle charge throughout the cycle, reduce the uneven flow of the mixture through the cylinders, which leads to a decrease in specific fuel consumption and a decrease in emissions of harmful substances into the atmosphere with the exhaust gases.

Claims (5)

1. A power supply system for an internal combustion engine comprising a throttle body with a housing, a throttle valve, a main air duct with a small diffuser, and a throttle and throttle body. MI, a fuel metering device, made in the form of an electronically controlled injector and communicated with a small diffuser, fuel channel and adjustment screw, which, in order to reduce fuel consumption and reduce harmful emissions, the system is additionally equipped with a mixing chamber, confusion-diffuser section, with-- a sole and bypass channel, and the connecting channel is equipped with an air jet and is located between fuel channel directly at fuel metering device and confuser section, bypass channel located between throttle space and confused section, fuel channel located between fuel metering unit and minimum confuser-diffuser section, and mixing chamber communicated with confusion-diffuser section and small diffuser. 2. The system according to claim 1, of tl and - chyushcha. due to the fact that the adjusting screw is located in the confuser-diffuser section, and the ratio of the areas of the adjustable cross section of the confusing section and the cross section at the entrance to the confusing section is made in the di- and apason 0.5-2.0. 3. The system of PP. 1 and 2, it is about the fact that the volume of the fuel channel is 2-4 times the volume of the minimum fuel cycle charge. 4. The system of PP. 1-3, characterized in that the mixing chamber is made in the form of a cylinder and a cone-shaped constriction interconnected and mounted coaxially in the main air duct. 5. Power system according to claims. 1-4, characterized in that the bypass at the entrance to the cylindrical part of the mixing chamber is made tangential. ff (put.2