UA46334A - GAS FUEL SUPPLY SYSTEM IN A CAR ENGINE - Google Patents

Abstract

A gas fuel supplying system for an automobile engine, providing a separate control for an idle running mode and an unloading devices by delivering to them a rarefaction from various cavities - from an inlet collector, and from the over throttle space of the carburetor. For this the idle running device is connected to the inlet collector pipe, in which a normally open electromagnetic valve is installed, equipped by its own control unit, connected to an end switch, mechanically connected to the carburetor throttle, and the unloading device is directly connected to its over throttle space.

Description

Description of the invention

The invention relates to the field of engine construction, in particular, to power systems of gas cylinder cars with 2 carburetor internal combustion engines (ICEs) running on liquefied gas.

There are well-known liquefied gas fuel supply systems for a car engine, which provide dosing of fuel supply depending on the operating mode and load on the engine, containing a gas cylinder, an intake pipe, a carburetor-mixer with a throttle valve and a two-stage gas reducer. In such systems, control is carried out by supplying rarefaction into the specified cavities of the gas reducer or by additional introduction of adjustable devices, for example, with a kinematic connection (11.

There are well-known internal combustion engine power systems in which the improvement of the control characteristics is achieved, for example, by installing additional control elements in the supply regulator fitting channels (21.

There are well-known power systems for gas internal combustion engines, the technical solutions of which are aimed at increasing fuel economy and reducing the toxicity of exhaust gases (ZI. 12. The disadvantage of known systems is that they almost do not take into account the inertia of gas-dynamic processes during transient engine operation modes, which leads to discrete regulation , or achieve its reduction by introducing a number of additional elements into the system that require regulation, which complicates the system constructively and technologically and reduces their reliability.

The closest technical analogue of the proposed system is the gas fuel supply system in

Internal combustion engine, made of a set of gas cylinder equipment, forming a circuit for supplying the engine with gas fuel

And, 15.

Common features of the claimed and known systems are a set of gas cylinder equipment, which includes a gas cylinder, a reducer-evaporator with an idle device and an unloading device, a mixer, a carburetor with a throttle valve, an intake manifold. 29 The known system has a gas supply tee (hereinafter referred to as a tee) intended for supplying and "adjusting the amount of gas supplied to separate chambers of the mixer, intended, in turn, for supplying and dosing gaseous fuel into the air flow entering the engine through the carburetor , that is, to prepare the working mixture for the engine cylinders.

In this system, the idle speed device and the unloading device are structurally made in the case of the 30 reducer-evaporator, have a common control, carried out by supplying vacuum from the intake manifold through a common tee. Dosing of fuel supply is carried out by changing the position of the valve, which has a rigid connection with the membrane device. The position of the valve depends on the pressure difference in the cavities located to the right and left of the membrane. The main disadvantages of such a fuel supply system are: Ge) increased fuel consumption at idle and partial loads;

Increased fuel consumption in the mode of forced idling; M increased value of exhaust gas toxicity.

The basis of the invention is the task of improving the gas fuel supply system in the automobile engine, optimizing the fuel supply control algorithm in idle and transient modes "in order to increase fuel efficiency and reduce the toxicity of exhaust gases. C 70 In order to achieve this technical result in the gas fuel supply system in the car engine, which includes a gas cylinder, a reducer-evaporator with an idle device and an unloading device,

From" a mixer, a carburetor with a throttle valve, an intake manifold, to increase fuel economy and reduce the toxicity of exhaust gases, according to the invention, separate control of the idling device and the unloading device is carried out by separately supplying them with vacuum, for which 45 the idling device is connected to intake manifold through a pipeline in which a normally open solenoid valve is installed in series, supplied by its own electronic control unit, having

Gee! communication with a limit switch mechanically connected to the throttle of the carburettor, and the unloading device is directly connected by a pipe to its overthrottle space. o There is a cause-and-effect relationship between distinctive features and the technical result achieved. со 20 In the proposed system, separate control of the idling device and the unloading device from different cavities - the intake manifold and the overthrottle space of the carburetor - is carried out.

T» Control of the idle speed device with the help of an electromagnetic valve made it possible to eliminate the supply of gaseous fuel during engine braking modes, to reduce the total fuel consumption, control of the unloading device by supplying vacuum from the overthrottle space of the carburetor made it possible to improve the operation of the engine in transitional modes from the speed of the idle speed to the load, and in also improve the adaptability of the engine to load changes. Thanks to this, a new technical result was obtained - the fuel supply algorithm was optimized in idle and transient modes.

The claimed technical solution is new because it is not known from the state of the art, has an inventive level, because the proposed separate control of the idle device and the unloading device 60 from different rarefaction cavities does not clearly follow from the state of the art, industrially applicable because it is intended for use in automobile engines.

The technical essence of the proposed invention is explained by the drawing (fig.), which schematically shows the gas fuel supply system in the car engine.

The gas cylinder 1 is connected by pipeline 2 to the reducer-evaporator З, which has a non-working device 4 and an unloading device 5 with connecting fittings 6 and 7, respectively. A pipeline 8 is connected to the nozzle 6 of the idle device 4, which connects it to the electromagnetic valve 9, which, in turn, is connected by a pipeline 10 to the nozzle 11 of the intake manifold 12, connected to the carburetor 13, having a throttle valve 14. Electromagnetic the valve 9 is supplied with its own electronic control unit 15, connected to the limit switch 16, mechanically linked to the throttle valve 14.

The unloading device 5 is connected to the nozzle 18 of the overthrottle space of the carburetor 13 by means of a fitting 7 through a pipeline 17.

The system works in the following way.

When the engine is idling, fuel is supplied only through the idling device 4, to which vacuum is supplied from the intake manifold 12 through the pipeline 10, while the electromagnetic valve 9 and pipeline 8 are open. When the opening angle of the throttle valve 14 of the carburetor 13 is increased, the vacuum is supplied from of the overthrottle space of the carburetor to the unloading device 5 through the pipeline 17, while the fuel supply through the unloading device to the engine increases, and its rotation frequency increases, and the fuel supply through the idle speed device 4 decreases.

When the throttle valve 14 is returned to its original position, the process occurs in the reverse order, namely: the fuel supply through the unloading device 5 stops, fuel enters the engine through the idle speed device 4 - the engine operates at idle speed.

During the movement of the car, the mode of forced idle often occurs in the case of movement of the car with the throttle valve 14 closed and the kinematic connection between the wheels of the car and the engine turned on. In this case, the fuel supply system works as follows. The throttle valve 14 is closed, the limit switch 16 is turned on, mechanically connected to the throttle valve 14, the solenoid valve 9 is closed, fuel supply can be carried out through the idle speed device 4 at the command of the electronic control unit 15. At a rotation frequency of more than 1000 rpm, the solenoid valve 9 is closed and no fuel is supplied to the engine.

When the rotation frequency is reduced to less than 1000 rpm, on the command of the electronic control unit 15, the valve 9 is opened, while the vacuum is supplied to the idle speed device 4, and fuel enters the engine through it. "

The electronic control unit 15 is a mass-produced product for the automotive industry and is an electronic device for which the input signals are the position of the limit switch 16 and the voltage of the car's on-board electrical network. "Eco The proposed system provides long-term fuel supply in idle mode, transitional modes and forced idle mode, allows to reduce fuel consumption and the level of toxicity of exhaust gases. with

According to the proposed scheme, the power supply system of the 3M3-402 engine installed on the Gazelle car was made, the operation of which showed a positive result of the proposed technical solution. ise)

Used sources "E 1. Patent of the Russian Federation Mo2002091, cl. РО2М21/02, 1993. 2. Patent of the Russian Federation Mo2008492, cl. E02M21 /02, 1994

Z. Author's certificate of the USSR Mo1537871, cl. ЕО2М21/02, 1990. 4. Prospectus of the Novogrudsk Gas Equipment Plant "Gas cylinder equipment sets for passenger cars running on liquefied petroleum gas." Operating manual 2101 - 4400.000.000RZ. OJSC o ptv) with "Novogrudsky Gas Equipment Plant", 200 Or. P. 4; 8; 9; 11; 25-27; 39; 40; 43; Fig. 1.1; 1.2; 1.4; 8.1; 8.2; 9. 5. Prospectus of the Novogrudsk Gas Equipment Plant "Set of gas cylinder equipment for cars (for AZLK and VAZ cars)". Technical description and operating instructions. Novogrudsk, Grodno Region, 1992, p. 3, 4.

Claims (1)

The formula of the invention o Gas fuel supply system in a car engine, which includes a gas cylinder, a reducer-evaporator with a 5r idle device and an unloading device, a mixer, a carburetor with a throttle valve, o an intake manifold, which is distinguished by the fact that it has separate control of the idle device stroke and Y" unloading device by separately supplying them with vacuum, for which the idle stroke device is connected to the intake manifold by a pipeline in which a normally open solenoid valve is serially installed, equipped with its own electronic control unit that is connected to the limit switch, mechanically connected to the throttle valve of the carburetor, and the unloading device is directly connected by a pipeline to its suprathrottle space. 60 b5