RU2006621C1 - Fuel system of dual-fuel internal combustion engine - Google Patents

Abstract

FIELD: automotive industry; internal combustion engines. SUBSTANCE: gas from liquefied gas bottle 13 is delivered to inlet channel 19 of carburetor 2 of engine 1 through gas regulator 17 and first shutoff valve 15 or second shutoff valve 16 installed in parallel. Third shutoff valve 11 on main line along which gasoline is fed to carburetor can be either closed or opened. In the latter case fuel mixture octane rating is raised which enhances environmental protection and increases service life of engine. Control of gas delivery into engine is provided by accelerator pedal which acts onto carburetor throttle valve rigidly coupled with turning spool 22 installed in intake channel of carburetor 2. To enhance vaporization of gas in bottle at intensive operation in the run, bottle is heated by air from car interior heater through air duct in which gas line is placed. EFFECT: enlarged operating capabilities. 2 cl, 2 dwg

Description

 The invention relates to the automotive industry, in particular to power systems for engines of various fuels.

 Increasing the efficiency of operating cars is possible by ensuring their operation on gaseous fuel, or on liquefied gas, or on a mixture of gasoline and gas, which increases efficiency and ensures the environmental cleanliness of internal combustion engines.

 A known power system of an internal combustion engine with two types of fuel, comprising a carburetor mounted on the engine inlet, a gas pump communicated through a gas line with a gas tank and a carburetor float chamber, a gas-liquid cylinder with an outlet fitting, a gas reducer connected by a gas line to the engine inlet through outlet fitting, carburetor inlet and throttle installed in the engine inlet, as well as shut-off valves on the highways (ed. St. N 13702 79, CL F 02 M 13/08, 1986).

 The disadvantages of the system are the low reliability of the electrically operated locking devices used in it, leading to severe consequences in case of failures due to a possible gas leak when the locking device is jammed in the open position, as well as the great complexity of the system due to the use of a two-stage automatic gearbox controlled by by the rarefaction parameter behind the throttle in the engine intake tract.

 The aim of the invention is to simplify the design and operation of the engine with two types of fuel and increase its reliability.

 For this, the fuel supply system of an internal combustion engine with two types of fuel, containing a carburetor installed on the inlet of the engine, a gas pump connected through the gas line to the gas tank and the carburetor float chamber, a gas-liquid cylinder with an outlet fitting, a gas reducer communicated through the gas line to the engine exhaust path through the outlet fitting, the carburetor inlet and the throttle installed in the engine inlet, as well as the first and second locking elements, position gas in the gas line, and the third shut-off element installed in the gas line, it is equipped with a slide valve, rigidly connected to the valve axis and installed in the carburetor inlet, and a gas bypass, and the carburetor inlet is in communication with the engine inlet cavity behind the throttle, the first locking element is installed between the outlet fitting of the gas-liquid cylinder and the gas reducer, the second locking element is mounted in the bypass gas line connected to the gas master if parallel to the gas gear, and the third locking element is located between the gas pump and the gas tank, while the first, second and third locking elements are placed in the passenger compartment within the reach of the driver’s hand.

 The gas line section between the cylinder and the first and second locking elements can be made spiral-shaped and placed in the air duct, the entrance of which is connected to the radiator-heater of the passenger compartment, and the output is directed to the surface of the cylinder.

 In FIG. 1 shows a diagram of a power system; in FIG. 2 - placement of system elements on a passenger car.

 The system is made in the form of a carburetor 2 mounted on the body of an automobile engine 1 with an air purifier 3 placed on it. A sleeve 5 from the air vent of the engine crankcase 1 is suitable for the air cleaner nozzle 4. The exhaust vent 6 of the air purifier 3 is connected by a tube 7 to a vacuum ejection tube 8 located in the lower carburetor parts. The gas pump 9 mounted on the engine 1 is connected by a pipe 10 to the carburetor 2 float chamber, and the pump 9 exit through the shut-off valve 11 is connected to the gas tank 12. A gas-liquid cylinder 13, installed by the shut-off valve and the outlet fitting forward in the direction of the vehicle’s movement and obliquely to exceed the outlet fitting 14 above the level of the liquefied gas charged into the cylinder 13, connected to the shut-off valves 15 and 16 by a line. A gas reducer 17 is installed after the valve 16. Its output and the output of the valve 15 are combined the pipe 18 is connected to the inlet channel 19 of the carburetor 2, designed to supply the vapor of the crankcase ventilation system. The inlet channel 19 through the spool 20 with a constant throttle 21 and a groove 22 on its surface is in communication with the cavity of the engine inlet tract behind the throttle valve 23. The spool 20 and the valve 23 are mounted on the shaft 24 connected to the accelerator pedal of the car. Part of the line between the cylinder 13 and valves 15 and 16 is made in the form of a spiral and placed in the water duct located between the outlet of the radiator-heater and cylinder 13. Valves 15 and 16 are located under the front edge of the driver's seat so that he can easily reach them.

 The system operates as follows.

 Before operation, the shut-off valve 15 is opened so that the gas system is in standby state. There are three modes of operation of the system.

 1. The mode of operation on gasoline.

 In this mode, all valves of the gas system are closed, and the valve 11 of the gas system is open. The engine is started and its operation is carried out as usual with the fuel supplied from the gas pump 9 through the pipe 10 to the float chamber of the carburetor 2. The mode is controlled from the accelerator pedal through the throttle axis 23. The mode is terminated with the intention to switch to the gas mode in the future by closing the valve 11 and the generation of fuel from the float chamber of the carburetor 2, which occurs in 7-10 s depending on the engine speed.

 2. Gas operation mode.

 When the valve 15 is closed, the ignition of the car is turned on, the accelerator pedal is pressed to open the throttle valve 23 and valve 16 is opened. The engine starts and (when using a gearbox of the RGS 1-1,2 type) operates within the low and medium revs. To obtain maximum speed and maximum power, valve 15 is additionally opened. The speed control is provided by the accelerator pedal, since the gas is supplied to the throttle space through the valve 20, connected to the axis of the throttle valve 23, in proportion to pressing the accelerator pedal, the valve opens and the valve 20 turns, increasing the flow area for gas. The transition from the second mode to the first is performed when the vehicle is moving for 2 s by closing valve 15 (or 15 and 16, if the latter was also open) and opening valve 11.

 3. The operation mode on gasoline and gas at the same time.

 This mode is used to operate an engine with a high degree of compression on low-octane fuel to increase its octane number, improve fuel combustion and improve environmental friendliness when the engine is running (propane octane number 110, so adding it to a gasoline mixture with a lower octane number allows you to get a mixture of any quality ) To do this, when the engine is running on gasoline (valve 11 is open) by slowly opening the valve 15, stop knocking and leave the valve in this position for the entire duration of the engine operation. After turning off the engine, the valve 15 should be immediately closed to avoid unproductive gas leakage from the cylinder 13. This mode significantly increases the resource and efficiency of the engine.

 In these modes, the suction of vapors from the crankcase and their combustion in the engine together with the fuel supplied to it through the carburetor is provided by feeding these vapors through a tube 7 to an ejection tube 8, which is directly connected to the input channel of the intake manifold, where the vacuum is constantly maintained during engine operation .

 In all cases, at the end of the movement on the vehicle, close valves 15, 16 and the shut-off valve of the cylinder 13.

 The use of this system significantly improves engine efficiency and environmental friendliness when operating in modes 2 and 3, carbon monoxide in the exhaust is practically absent. Fire safety is significantly improved compared to the prototype, since gas leakage in the mains in the engine compartment is easily detected due to the odor present in the composition of the odorant filled into gas-liquid cylinders. If the leak is not detected immediately or while the vehicle is running, there is no danger either, since the gas is blown out of the engine compartment under the hood and does not come into contact with the red-hot exhaust manifold, as is usually the case in a fire due to a gas leak directly from or from the carburetor the gas pipeline. (56) Copyright certificate of the USSR N 1370279, cl. G 01 M 13/08, 1988.

Claims (2)

 1. THE POWER SYSTEM OF THE INTERNAL COMBUSTION ENGINE WITH TWO TYPES OF FUEL, containing a carburetor mounted on the inlet of the engine, a gas pump communicated through a gas line with a gas tank and a carburetor float chamber, a gas-liquid gas cylinder with a gas outlet and a gas cylinder with a gas outlet engine through the outlet fitting, the carburetor inlet and the throttle installed in the engine inlet, the first and second locking elements installed in the gases second line, the third locking element installed in the gas line, characterized in that it is equipped with a slide valve, rigidly connected to the valve axis and installed in the carburetor inlet, a gas bypass, and the carburetor inlet is in communication with the engine inlet cavity behind the throttle, the first shut-off element is installed between the outlet fitting of the gas-liquid cylinder and the gas reducer, the second shut-off element is installed in the bypass gas line connected to the gas mag Tralee parallel to the gas pressure reducer, the third closure member is mounted between gasoline and the fuel tank, and the first, second and third shut-off devices arranged in the vehicle within reach of the driver's hands.  2. The system according to p. 1, characterized in that the gas line section between the cylinder and the first and second locking bodies is made spiral-shaped and placed in the air duct, the input of which is connected to the radiator-heater of the passenger compartment, and the output is directed to the surface of the cylinder.

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