SU1325181A1 - I.c.engine fuel system - Google Patents

Abstract

The invention relates to mechanical engineering and allows to increase the operational reliability of the power supply system. An additional flow channel 28 of a high-octane fuel metering device (BOT) with a diffuser 26 and a sprayer 22 is located between the carburetor diffuser 2 and its throttle valve (DZ) 3. The dispenser 5 is also equipped with a mixing chamber 25 with a DZ 27. DZ. 27 is kinematically connected with a vacuum drive 10. In idle mode, the spring-loaded diaphragm (PD) 7 covers the DZ 27, preventing the flow of BOT through the chamber 25. When the engine is loaded, the PD 7 increases the opening angle of the DZ 27 and partial replacement of the BOT fuel occurs. At maximum loads, PD 7 opens the DZ 27 and the engine runs on the HERE, thereby preventing detonation of the engine. 1 il. g 24 2D 16 & (L with HchE ate 00

Description

The invention relates to construction engineering, in particular to power systems for an internal combustion engine.

The purpose of the invention is to improve the operational reliability of the power supply system,

The drawing is a schematic diagram of a power supply system for an internal combustion engine.

The system contains a carburetor 1 with a diffuser 2 and a throttle 3 placed in the main flow channel 4, and a dispenser 5 with a regulating mechanism 6 made in the form of a diaphragm 7 with a spring 8, a driving shaft 9 and a vacuum drive 10, the working cavity 11 of which is connected to throttling space of the channel 4. The spring 8 has an adjusting screw 12 of the pre-tightening. The system also includes a high-octane fuel supply circuit 13 and a low-octane fuel supply circuit 14. The circuits 13 and 14 have individual float chambers 15 and 16, respectively, connected via fuel injection pumps 17 and 18 to fuel tanks 19 and 20. A metering system 21 with a sprayer 22 is connected to the float chamber 15 of high-octane fuel and a metering unit to the float chamber 16 system 23 with a spray 24.

The dispenser 5 is made in the form of an additional mixing chamber 25 with diffu-yura 26 and the throttle valve 27.

The throttle valve 27, installed in the additional channel 28 of the chamber 25, is connected by a driving rod 9 to the diaphragm 7 of the regulating mechanism 6. The flow channel 28 by the throttle part 29 communicates with the flow channel 4 of the carburetor 1 between its diffuser 2 and the throttle 3. The spray gun 22 is located in the diffuser 2 carburetor 1, and. atomizer 24 high-octane fuel - in the diffuser 26.

The system works as follows.

When the engine is not running, the throttle valve 27 of the additional mixing chamber 25 is fully open by the adjusting mechanism 6.

When starting a cold engine to eliminate the consumption of high-octane fuel, throttle valve 27 is forcibly covered from the driver’s cabin along with an air damper (not shown) of the main carburetor. A warm-up engine is started without forced closure of valve 27, since in this case throttle valve 3 is closed and the vacuum above this valve is so small that the supply of high-octane fuel through the mixing chamber 25 is excluded.

After starting, the engine is switched to idle mode. Vacuum from

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the throttle space of the carburetor 1 is transferred to the working cavity 11 of the mechanism 6. The diaphragm 7, compressing the spring 8, covers the valve 27, preventing the consumption of high-octane fuel through the mixing chamber 25.

When the engine is loaded, the vacuum in the throttle space of the carburetor 1 decreases and when it reaches a certain value, the diaphragm 7 begins to slightly open the flap 27. The opening of the flap 27, and therefore, the start of the high-octane fuel-air mixture through the mixing chamber 25 can be set using the adjusting screw 12 of the mechanism 6. With a further decrease in the vacuum in the throttle space of the carburetor 1, the diaphragm 7 increases the opening angle of the flap 27, the vacuum at the sprayer 22 increases, and at sprayer 24, it decreases. Due to this, there is a partial replacement of low-octane fuel with high-octane. As the load approaches and to the nominal proportion of high-octane fuel in the mixture prepared in the carburetor 1, it increases and, accordingly, the proportion of low-octane fuel decreases. Pa maximum loads, when the throttle valve 3 is fully open and the vacuum in the throttle space is practically reduced to zero, the diaphragm 7 opens the valve 27 and the engine runs on high-octane fuel, thereby preventing detonation of the engine.

In the proposed feed system, gas can be used as a high-octane fuel by supplying it from a cylinder through a reducer to the diffuser of the mixing chamber, or methanol and its solutions.

Such constructive implementation of the system provides an increase in its operational reliability.

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Claims (1)

Invention Formula The power supply system for an internal combustion engine, containing a carburetor with a main flow channel and a dosing system, a diffuser and a throttle valve placed in it, a high-octane fuel metering device with an adjustable mechanism in the form of a spring-loaded diaphragm with a drive brush and a vacuum drive, the working cavity of which is connected to a rear-end choke. , and the contours of the supply of high-octane and low-octane fuels, each of which is equipped with a spray and a float chamber connected to the fuel th tank, and connected to the metering system, the low-octane fuel atomizer disposed in the diffuser circuit karbyu1325181 3 Rator, characterized in that, with the aim of the slon, and an additional way to increase operational reliability, the channel is located between diff :( The high-octane fuel metering device is equipped with a carburetor and its throttle (.) thru an additional flow channel with a diffuser, and the throttle valve is dispensed with an infuser and an atomizer and an additional magnetically associated with a vacuum impurity mixing chamber with a throttle body.