RU2432488C2 - Selection and supply method of different types of fuel to internal combustion engine - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: selection and supply method of different types of fuel to internal combustion engine includes fuel type selection, their ratio and supply control at engine operation by electronic control unit according to the signals from temperature sensor and engine load sensor. Additionally the signals from engine controller, input manifold pressure sensor, fuel temperature and pressure sensor, engine oxygen sensor are supplied to electronic control unit. According to these signals electronic control unit automatically selects the version and quantity of fuel and fuel mixtures for different engine operation modes.

EFFECT: invention allows without considerable design changes and modifications of existing engines mounted at domestic and foreign vehicles increasing of their efficiency and environmental friendliness at simultaneous increase of engine power using the existing fuel supply systems and their components.

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Description

The claimed technical solution relates to the field of engine building, namely to internal combustion engines operating on several types of fuel (for example, gas, gasoline, hydrogen, etc.).

The engines used in automobiles and operating on various types of fuel and their mixtures are widely known. See, for example, copyright certificates of the USSR No. 1650933, publ. 03/20/89, No. 91754, publ. 07.17.50 and others.

Closest to the claimed technical solution is a method of supplying and mixing gas and gasoline in an internal combustion engine according to Russian patent No. 2272929 publ. 03/27/2006. This method includes the supply of liquid and gaseous fuel and ignition of the fuel from electric ignition, in which the engine is started on a gas-gas mixture, and heating to a temperature of 60 ± 5 ° C on a gas-air mixture. In this case, the selection of fuels, their proportion and supply control during engine operation is carried out by an electronic control unit according to signals from temperature and load sensors on the engine, when the engine reaches a temperature of 60 ± 5 ° C, the gas injector is turned on and the liquid fuel injector is turned off, the engine is powered by gas , at the beginning of the movement, when the speed increases, the liquid fuel injector is turned on, the gas-gas mixture enters the engine, when it reaches the engine speed corresponding to the maximum power, it turns off I injector liquid fuel, the engine continues to work on gas.

The disadvantage of this method is the lack of an automatic mode of choosing the type of fuel depending on the operating mode and engine operating conditions, since it provides a tough algorithm for regulating the fuel supply, not all possible options for controlling the fuel supply are taken into account depending on the state and operating mode of the engine, the pressure of the intake manifold of the engine and the characteristics of the fuel used are not taken into account.

The objective of the proposed technical solution is to create a method:

- allowing to ensure the operation of the engine on different types of fuel and their mixtures in all operating modes with any combination of different types of fuel;

- allowing at each moment of engine operation to choose the most effective, in terms of engine performance and tasks, type of fuel,

- providing the versatility and simplicity of the technical implementation of the solution, compatible with the main electronic systems of automobiles.

The technical result consists in the possibility of applying the solution to all modern engines with injection and carburetor power systems without structural alteration of the engine, using most components of automotive fuel supply systems. This ensures the operation of the car on several types of fuel and their combinations in the following modes:

- work on liquid fuel;

- work on gaseous fuel;

- work on a mixture of liquid and gaseous fuels in any proportions required for an internal combustion engine;

- work in automatic mode - selection of types of fuel and their mixtures with maximum use of the positive properties of each type of fuel in various modes and operating conditions is carried out automatically by the electronic control unit.

This technical result is achieved as follows. In the method of selecting and supplying various types of fuel to an internal combustion engine, including the selection of types of fuel and their proportion, the fuel supply during engine operation is controlled by an electronic control unit based on signals from temperature sensors and engine load. At the same time, the electronic control unit additionally receives signals from the engine control controller, from the intake manifold pressure sensors, fuel temperature and pressure sensors, and also from the engine oxygen sensor, taking into account which the electronic control unit automatically selects the option and amount of fuel or fuel mixtures for various modes of operation of the engine.

The method can be implemented using a system for selecting and supplying various types of fuel to an internal combustion engine.

The drawing schematically shows one embodiment of such a system.

This system contains a line for supplying liquid fuel 1, a line for supplying gaseous fuel 2, on which respectively devices for supplying these types of fuel - liquid 3 and gaseous 4, are connected, connected to the intake manifold 5 of the internal combustion engine 6. The fuel supply devices 3 and 4 are electrically connected to electronic control unit 7. The number of fuel supply devices 3 and 4 (fuel injectors) on each supply line depends on the number of engine cylinders and the fuel supply circuit.

On the gas fuel supply line 2, fuel temperature 8 and fuel pressure sensors 9 are installed, electrically connected to the electronic control unit 7 and generating output voltages that are proportional to the temperature of the gaseous fuel and the pressure inside the fuel line of its supply line. 10 - exhaust manifold, in which an oxygen sensor 11 can be installed as a state and operating mode sensor, which generates an output voltage proportional to the ratio of the components of the air-fuel mixture. 12 - pressure sensor (vacuum) of the intake manifold 5, which generates a voltage proportional to the pressure in it.

A temperature sensor 13 of the engine (refrigerant) is installed on the engine, generating an output voltage that is proportional to the temperature of the engine. 14 - a standard (installed by the manufacturer of the car) engine control controller, the output signals of the nozzle control of which are connected to the input of the electronic control unit 7. 15 - a switch unit and an indication of the operating modes of the system. 16 - air intake.

The system operates as follows.

The operation of the described embodiment of the claims is based on the principle of using a control signal for the operation of each liquid fuel supply device generated by a standard (installed by the vehicle manufacturer) engine control controller 14. These control signals, as well as signals generated by the sensors of the state and operating mode of the engine 11 , 12, 13, sensors of the characteristics of the types of fuel 8, 9, are processed by the electronic control unit 7, which controls all the fuel supply devices (nozzle mi) of all the fuel supply lines.

The required amount of fuel is supplied to the manifold 5 of the engine 6 through the fuel supply devices 3 and 4 connected to the fuel supply lines 1 and 2. The fuel supply devices 3 and 4 are controlled by the output signals of the electronic control unit 7, which generates these signals based on the signals generated by the sensors of the state and operating mode of the engine 11, 12, 13, fuel characteristics sensors 8.9, and the engine control controller - 14.

The proposed automated multi-fuel system can operate in the following modes specified by the switch mode 15:

- in position 1, the engine runs on liquid fuel;

- in position 2, the engine runs on gaseous fuel;

- in position 3, the engine runs on fuel, which is a mixture of liquid and gaseous fuels in the proportions required for the internal combustion engine;

- in position 4, the engine runs in automatic mode (the choice of fuel is carried out automatically depending on the settings, fuel characteristics, condition and mode of operation of the engine).

In automatic mode, the system operates as follows. When the engine is powered on, the electronic control unit 7 determines the temperature of the engine by the signal of the temperature sensor 13 and, if the engine starts and reaches 450 rpm, opens in different combinations the liquid and gaseous fuel supply devices, feeding only liquid or only gaseous fuel, or a mixture of liquid and gaseous fuels in the proportions required for an internal combustion engine. The selected type of fuel supplied depends on the engine program and its settings related to specific conditions and tasks of operating vehicles.

The engine is heated to operating temperature on liquid fuel or a mixture of liquid and gaseous fuels. When the engine reaches operating temperature, the temperature sensor 13 sends a signal to the electronic control unit 7, which turns off the fuel supply devices 3 and turns on the fuel supply devices 4. Next, idling is carried out on gaseous fuel. At medium speeds and in smooth acceleration mode, the engine runs on a mixture of fuels in the proportions required for the internal combustion engine.

The engine in accelerator pump mode (with a sharp press on the gas pedal) is carried out on a mixture of fuels or on liquid fuel. Another important difference: work at stable speeds that do not require a load is carried out on gaseous fuel. The reference signals for the operation of the electronic control unit 7 are the signals of the engine control controller 14 and the oxygen sensor 11.

In position 3 of switch 15, the engine works similarly to working in automatic mode, except for operation in accelerator pump mode and at stable speeds. In position 3, operation in accelerator pump mode and at stable speeds that do not require a load is carried out on a mixture of fuels in the proportions required for an internal combustion engine.

When the car is moving, the engine control controller 14 and all the sensors constantly transmit information (data) to the electronic control unit 7, which automatically corrects the control signals of the fuel supply devices 3 and 4, supplying optimal (for) conditions for the type and quantity of fuels ( but).

The implementation option described above is illustrative and non-restrictive. The scope of the present description is determined by the content of the claims, and not the foregoing description, and should be considered to include any changes within the scope of the claims and the meaning of the features equivalent to the content of the claims.

Thus, the method of supplying different types of fuel and their mixtures compatible with simultaneous operation in an internal combustion engine, presented in this technical solution, allows, without significant structural changes and alterations of existing engines installed on domestic and foreign passenger cars, to increase their efficiency and environmental friendliness while increasing engine power, use existing fuel supply systems, as well as their components.

Claims (1)

A method for selecting and supplying various types of fuel to an internal combustion engine, including selection of types of fuel, their proportion and supply control during engine operation by an electronic control unit based on signals from temperature and load sensors on the engine, characterized in that the electronic control unit additionally receives signals from the engine control controller, from the intake manifold pressure sensors, fuel temperature and pressure sensors, and also from the engine oxygen sensor, taking into account which the electronic unit automatic control selects the option and amount of fuel or fuel mixtures for various modes of engine operation.

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