RU2811230C1 - Fuel supply system to internal combustion engine of gas-powered vehicle - Google Patents

Abstract

FIELD: combustion engines.

SUBSTANCE: invention relates to systems for supplying fuel to an internal combustion engine of a gas-powered vehicle running on compressed natural gas (hereinafter referred to as CNG) and liquefied natural gas (hereinafter referred to as LNG). The fuel supply system to internal combustion engine 1 of a gas-powered vehicle is proposed, containing controller 4 with its own software, CNG-LNG switch button 3, CNG cylinder 7, CNG supply valve 6, LNG supply valve 12, reducer temperature sensor 8, LNG reducer 9 , LNG heat exchanger temperature sensor 10, LNG heat exchanger 11, LNG cylinder 13. The process of monitoring gas temperature in LNG heat exchanger 11 and controlling the switching of the fuel type is carried out automatically by controller 4, through which CNG and LNG supply valves 6, 12 are automated, while the fuel type is switched when the temperature of the LNG heat exchanger and the gas temperature reach the CNG/LNG switching threshold.

EFFECT: increased level of safety and durability of the fuel system of cars with gas equipment under low ambient temperatures.

1 cl, 1 dwg

Description

The invention relates to the field of operation of a fuel supply system to an internal combustion engine of a gas-powered vehicle operating on compressed natural gas (hereinafter referred to as CNG) and liquefied natural gas (hereinafter referred to as LNG).

A device for supplying gaseous fuel to an internal combustion engine of a car is known, containing a gas cylinder connected by a pipeline to a reducer, a fitting installed on the gas cylinder and connecting the pipeline to the cylinder, equipped with a fuel solenoid valve mounted on the pipeline and electrically connected to a temperature sensor mounted on the engine, additional pipeline and fitting connecting the gas cylinder with the fuel electromagnetic valve, while the additional fitting is installed in the upper part of the gas cylinder (Pat. 2325546 Russian Federation, IPC F02M 21/02. Device for supplying gaseous fuel to the internal combustion engine of a car / Shcherbatyuk A.P. , Ogly Z.P. - No. 2006117594/06; application 12/10/2007; published 05/27/2008; Bulletin No. 15).

The disadvantages of this design are: the mechanical vulnerability of pipelines that are not supported by shut-off valves on the fittings in the event of a pipeline breakdown, as well as the design itself complicates the safe installation and operation of the cylinder in the passenger compartment, making it difficult to identify gas leaks after installing the cylinder.

A known device is a belt electric heater of coolant, equipped with two belt, ring heating elements, coaxially placed in the middle part of the heater body; a twist chamber is located in the heater cover, communicating with the body cavity through peripheral holes (Pat. 2231677 Russian Federation, IPC F02M 17/ 06. Belt electric coolant heater / Robustov V.V., Fomin S.G., Sharapov V.K. - No. 2002124117/06; application 09.10.2002; publ. 06.27.2004).

The disadvantage of this device is the need to integrate the device into the engine cooling system, a large number of components and parts involved, high labor intensity of replacement and cost, the impossibility of using it as an electric heating device for a gas fuel cylinder of cars with gas cylinder equipment due to design features.

A known tape electric heating device for a gas fuel cylinder of cars with gas-cylinder equipment is capable of optimizing the internal temperature of a gas fuel cylinder in order to compensate for the increase in gas volume when used in conditions of low temperatures and large temperature changes in the environment, which is adopted as a prototype (Patent 173108 Russian Federation, MPK F02M 31/125, MPK F02M 21/06. Belt electric heating device for a gas fuel cylinder of cars with gas-cylinder equipment / Kuznetsov E.E., Shchitov S.V., Ushakov R.M., Goncharuk A.I., Kovalevsky V.N., - No. 2016149635; application 12/16/2016; published 08/11/2017).

The disadvantage of this device is the large number of components and parts involved, the high complexity of replacement and the impossibility of automated control of the device.

The objective of the invention is to prevent the liquid fraction of LNG from entering the car engine and freezing of elements of gas cylinder equipment (hereinafter - LPG) when the coolant temperature in the LNG heat exchanger is insufficient.

The technical result of the proposed invention is to increase the level of safety and durability of the fuel system of cars with LPG in conditions of low ambient temperatures.

The desired result is achieved by installing a controller with its own software, through which the CNG and LNG supply valves are automatically controlled, while the fuel type is switched when the temperature of the LNG heat exchanger and the gas temperature reach the CNG/LNG switching threshold

The essence of the invention is as follows.

The proposed connection diagram (Fig.) contains an engine 1, injectors 2, a CNG-LNG switch button 3, a controller 4, a CNG reducer 5, a CNG supply valve 6, a CNG cylinder 7, a reducer temperature sensor 8, an LNG reducer 9, an LNG heat exchanger temperature sensor 10, LNG heat exchanger 11, LNG supply valve 12, LNG cylinder 13.

When the CNG-LNG switching button 3 is turned on and there is engine speed at the controller input 4, the coolant temperature control mode in the CNG heat exchanger is activated (light indication by the LED built into the CNG-LNG switching button with a period of 1 time per second).

The temperature data of the CNG heat exchanger 11 is compared with those set in controller 4 and when the switching threshold (+40°C) is reached, the CNG supply valves 6 are switched off, and voltage is applied to the CNG supply valve 12 (the LED built into the CNG-LNG switch button stops flickering and switches to the constant operating mode, an additional short beep will sound via the buzzer built into the controller).

Switching to CNG occurs when the CNG-LNG switch button 3 is turned off, or in automatic mode when the gas temperature drops to the one set in the settings (0°C).

The controller has a self-diagnosis function: reducer temperature sensor 8, CNG heat exchanger temperature sensor 10. If a malfunction occurs in the electrical circuit of heat exchanger temperature sensor 10 or reducer temperature sensor 8, the fuel will switch to CNG, at the same time the CNG-LNG switch button 3 begins to flicker, displaying a fault code , for the temperature sensor of the LNG heat exchanger 10 - three flashes, for the temperature sensor of the reducer 8 - five flashes (the light indication is duplicated by an audio signal).

If malfunctions occur simultaneously in two sensors 8 and 10, the indication priority will be given to the gearbox temperature sensor 8. Controller 4 is equipped with a protection system: protection against polarity reversal, protection against breakage and short circuit of the gearbox temperature sensor 8. In the event of a malfunction of controller 4, the vehicle will continue to operate at CNG.

The invention can find wide application in Gazprom Transgaz Ufa LLC when operating vehicles powered by compressed natural gas.

Claims (1)

A fuel supply system to the internal combustion engine of a gas-powered vehicle, containing a controller with its own software, a compressed natural gas (CNG) cylinder, a liquefied natural gas (LNG) cylinder, a CNG-LNG switch button, a CNG supply valve, an LNG supply valve, a temperature sensor reducer, LNG reducer, LNG heat exchanger temperature sensor, LNG heat exchanger, characterized in that the process of monitoring the gas temperature in the LNG heat exchanger and controlling the switching of the fuel type is carried out automatically due to the controller, through which the CNG and LNG supply valves are automated, while The fuel type is switched when the LNG heat exchanger temperature and the gas temperature reach the CNG/LNG switching threshold.