SU1058518A3 - System for controlling recirculation of exhaust gases of internal combustion engine - Google Patents

Abstract

The exhaust gas feed back is regulated by a depressions switch over valve provided with one inlet union, two outlet unions and regulator inlet. The switch over valve contains two diaphragms which cause the inlet to make connection with the outlet to the fuel regulator valve and at the same time interrupt the connection between inlet and the second outlet leading to the exhaust return valve. The result is that no exhaust gas is fed back to the engine and a leaner mixture is established. The depression is additionally regulated by a magnetic valve which opens when the engine working temperature is below 60 deg.C, or the vehicle is exceeding a pre-calculated speed or the gear change lever is in fourth or direct drive position.

Description

FIELD OF THE INVENTION The invention relates to mechanical engineering, in particular, to systems for reducing the toxicity of exhaust gases of internal combustion engines. Exhaust gas control systems for engine internal combustion with inlet and exhaust pipelines connected by a bypass channel and a carburetor with a float chamber in which a metering element is located are known for supplying additional fuel to compensate for the deterioration of engine performance during recirculation, a throttle valve and a hole / throttle placed in the throttle zone, valves containing a first vacuum valve for controlling the amount of exhaust gas recirculated, located in the bypass channel and provided with a housing, a valve stem, a diaphragm and a diaphragm chamber, and a second vacuum valve for controlling the number of cm. Additional fuel by increasing the flow area of the metering element, a simple housing, a valve and a cylinder-piston device, a valve for switching the cut from the carburetor to the first and second vacuum valves, alternately equipped with a housing with one BitycKHUM and two outlets, one valve rod, diaphragm in a nafravennaya cavity, the first vacuum line connected with the carburetor, connecting the carburetor opening in the area of the Yarosezhnaya valve with the inlet opening of the switching valve of view; The second vacuum line communicating the first valve with one of the outlet openings of the vacuum valve, the third vacuum line, the second vacuum valve with the other outlet of the vacuum valve 13, however, the known recirculation control systems do not sufficiently effectively reduce engine exhaust toxicity. The purpose of the invention is to reduce the toxicity of exhaust gases. To achieve this goal, the exhaust gas recirculation control system of an internal combustion engine with inlet and outlet piping, provided by an overflow channel, and a carburetor with a float chamber in which a metering element is located to supply additional fuel to compensate for the deterioration of engine performance during recycling, a throttle valve and a hole located in the throttle valve zone containing the first vacuum valve to control the amount of recycle Exhaust gases, placed by the J bypass channel and equipped with a housing, valve stem, diaphragm and diaphragm chamber, a second vacuum valve for controlling the amount of additional fuel by increasing the flow area of the metering element, equipped with a housing, valve stem and device cw.-. a linder-piston; a vacuum valve switching valve from the carburetor to the first and second vacuum valves, alternately equipped with a housing with one. inlet and two outlet ports, valve stem, diaphragm and diaphragm cavity in communication with the carburetor, first vacuum line connecting the cartoptopopa aperture in the throttle valve area to the vacuum valve inlet opening, reporting the first valve to the outlet and the outlet valve. vacuum switch, a third vacuum line, which communicates the second vacuum valve with another valve outlet, does not switch to vacuum pressure, additionally A valve with a vacuum transfer delay valve, located in the first vacuum magistrale, equipped with a housing, a partition with an opening divided into two chambers, and in the latter a control valve is placed, one of the chambers communicating with the carburetor opening in the throttle zone, and the other with the diaphragm valve cavity switch vacuum. FIG. 1 is a block diagram of {control over; in fig. 2 shows the first vacuum valve for controlling the KqjiH4ecTjpOM recirculated exhaust gas f in FIG. 3 - a second vacuum valve for controlling the amount of additional fuel; in fig. 4, vacuum valve; in fig. 5 - the same, option; in fig. 6 - valve for delaying the transfer of vacuum. The exhaust gas recirculation control module is located on the internal combustion engine 1 with inlet 4 and exhaust pipes 2 and 3, respectively, by a carburetor 4 with a float chamber 5, in which a dosing element b is installed to supply additional fuel, which causes deterioration of engine performance during recycling, throttle a flap 7 and an opening 8 located in the throttle zone 7 .. The system contains a first vacuum valve 9 for controlling the amount of recycled exhaust gas in disposed in the bypass duct 10 and provided with a housing 11, a valve

a stem 12, a diaphragm 13 and a diaphragm chamber 14, a second vacuum valve 15, which includes a housing 16, a valve stem 17, and a cylinder-piston device 18. The third valve 19 leaves the system {the vacuum valve of the carburetor 4 to the first and second vacuum valves 9 and 15 alternately /, provided with a housing 20 with two injection and two outlets Emi 21, 21, 22 and 23, respectively, valve valve S4, diaphragm 25 and diaphragm cavity 26, connected with the carburetor 4..

The system also contains the first vacuum line 27 connecting the carburetor 4 hole 8 in the zone of the throttle valve 7 with the inlet 21 of the vacuum shut-off valve 19, the second vacuum screw 28 connecting the first valve 9 with one of the vacuum shut-off valve 19 and the third vacuum line 29, communicating the second vacuum valve 1 with another outlet port 22. vacuum switch valve. In addition, the system is additionally equipped with a vacuum transfer delay valve 30, placed in the first vacuum line 27 and provided with a housing 31, a partition 34 with an opening divided into two chambers 32 and 33, with a check valve 35. The chamber 32 communicates with the opening 8 of the carburetor 4 , aksmera 33 - with diaphragm cavity diaphragm) 13 switch over vacuum.

The system also includes a solenoid valve 36, coupled to a valve 30, controlling the transmission of the vacuum and connected to the water temperature sensor 37, the gearbox switch 38, the exhaust gas temperature sensor 39 and the speedometer 40.

The system works as follows.

When the engine is idling when throttle valve 7 is closed in the opening zone 8, there is no vacuum and the jBce three valves are in the original

position Waste gas recirculation does not occur.

When the throttle valve is open, a vacuum is created in the area of the opening 8, which is transmitted to the entrance of the opening 21 of the vacuum switching valve. As a result, vacuum is applied to the second vacuum valve 15, as a result of which an additional fuel line is blocked and the lean mixture is fed to the engine. Since there is no underpressure in the intake manifold with the throttle valve open, the valve 9 for controlling the amount of recirculated gases is in the position shown in FIG. 2. As a result, there is no recirculation.

Only for a certain period of ervmeni, immediately after the opening of the pre-jusper damper 7, the vacuum created in the zone of the opening 8 comes only to the inlet 21 of the vacuum shut-off valve 19, since the negative pressure reduction is delayed by the valve 30 In this case, since the negative valve 19, the pressure is in the initial the vacuum is transferred to the diaphragm valve 14 in the valve 9 and the exhaust gases are recirculated. The second vacuum valve 15 is in the initial position, and a rich mixture is fed to the engine.

When the vacuum (after actuation of the valve 30 J begins to flow into the diaphragm cavity 26 and reaches a predetermined length, the diaphragm 25 is lowered, while the hole 21 is connected to the hole 22, and the hole 23 is cut off from the hole 21.

Exhaust gas recirculation is stopped and the lean mixture is fed to the engine.

When X is injected 21 into valve port 19 (Fig. 4 /, the recirculation is stopped. In the embodiment shown in Fig. 5 (vacuum is applied to the orifice, recirculation occurs and stops when atmospheric pressure is applied to the orifice 21).

fut.i

i1.

Zz.

22

Th

X

w zs.

sss

-25

If

19 22

ui.S

Claims (1)

RECOVERY GAS CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE with intake and exhaust pipelines communicated by bypass channel and carburetor with float chamber, in which a metering element is placed for supplying additional fuel, which compensates for the deterioration of working character. engine choke during recirculation with a throttle valve and a hole located in the throttle zone, containing a first vacuum valve for controlling the amount of recirculated exhaust gases, located in the bypass channel and equipped with a housing, valve stem, diaphragm and diaphragm chamber, a second vacuum valve for controlling the amount of additional fuel by increasing the bore of the metering element, equipped with a housing, a valve stem and a cylinder-piston device, a valve In order to reduce the pressure from the carburetor to the first second vacuum valve, alternately equipped with a housing with one inlet and two outlet openings, a valve stem, a diaphragm and a diaphragm cavity in communication with the carburetor, a first vacuum line communicating the carburetor hole in the aperture of the throttle valve with the valve inlet , a second vacuum line communicating with the first valve with one of the outlets of the vacuum switch valve, § a third vacuum line, together the second vacuum valve with another outlet of the rarefaction switching valve, cast in that, in order to reduce the toxicity of exhaust gases, it is additionally equipped with a delay valve for the transmission of rarefaction, located in the first vacuum line, equipped with a casing, divided into two chambers with a partition a hole, and in the latter there is a control valve, one of the chambers communicating with the carburetor hole in the throttle aeon, and the other with the diaphragm cavity of the switching valve. SU “„ 1058518 'I **' t? '' ¹ '.................