KR101403071B1 - LPG 2 Method for two step Controlling Fuel of LPG gas injection type fuel pump - Google Patents

Abstract

The present invention provides a method for controlling a fuel in two steps, capable of reducing noise generated in a fuel pump and supporting efficient combustion of the fuel by controlling the fuel pump in multiple steps according to an engine loading area. When a tank pressure exceeds 360 kPa which is preset information, power applied to the fuel pump is turned off. When the tank pressure exceeds 50 kPa, the fuel pump is operated by comparing a fuel flex element and the preset information.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a two-stage fuel control method for a LPG gas injection type fuel pump,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel control method, and more particularly, to an LPG gas injection type fuel pump that supports efficient combustion of fuel through multi-stage control of a fuel pump in accordance with an engine load region, Stage fuel control method.

In general, gas fuels such as liquefied petroleum gas (LPG) and compressed natural gas (CNG) are much cheaper than gasoline or light oil, and knocking hardly occurs because of high octane number, (LPG) and compressed natural gas (CNG), which are cheaper than gasoline and light oil, are being used in recent years in the high oil price era. .

For example, the LPGI (LPG Injection) engine described in Korean Patent No. 10-0758490 uses LPG (Liquefied Petroleum Gas) as a fuel, which is charged in a liquid state The liquid fuel is sent from the cylinder to the fuel line by the filling pressure of about 3 Bar, and the liquid fuel is converted from the vaporizer to the gas of the gas (GAS) and injected into each combustion chamber through the injector.

At this time, the amount of fuel injected into each combustion chamber is corrected by the intake air amount and various various conditions of the vehicle so that the calculated fuel amount is injected, and the fuel pressure of the gas phase formed in the fuel line from the vaporizer to the injector is maintained at a constant pressure It is fitted with a manual pressure regulator in the carburetor.

When the temperature of the liquefied petroleum gas fuel is increased due to the engine radiant heat, the pressure in the fuel line rises as the saturated vapor pressure increases linearly. In particular, during parking after long-term driving, the fuel fed from the carburetor is stagnated in the line and the temperature of the engine is high, so that the increase in the pressure becomes even higher.

Accordingly, when the engine is turned off after driving, the fuel in the fuel line in the engine room rises in temperature due to the heat of the engine. In addition, the pressure rises and the pressure-increased fuel acts on the injector, (Tip), the evaporated fuel will leak, and the amount of leakage will increase as the injector is used for a long time.

As described above, when the fuel leaks, the fuel stays in the engine intake port or the combustion chamber and adversely affects the starting performance at the next startup.

In the conventional LPGI engine system, the engine control module (ECM) controls the fuel pump on / off by using the relays based on the fuel tank pressure. .

In addition, in the above-described conventional LPGI engine system, there is a problem that the fuel can not be efficiently used because the fuel pump according to the engine load is controlled only in one step.

In order to solve the above problems, an object of the present invention is to provide a fuel pump which is capable of controlling the fuel pump in one stage in a low engine load region, Stage fuel control method of a LPG gas injection type fuel pump for reducing noise generated in a fuel injection pump.

In order to solve the above problems, a two-stage fuel control method of a LPG gas injection type fuel pump according to the present invention is characterized in that (a) a fuel injection optimization module (FICM) Identifying a flex factor, and a throttle position sensor; (b) loading an engine control module (ECM) with the sensed information from the tank pressure, the fuel flex factor, and the throttle position sensor; And (c) controlling the fuel pump to be turned off or operated at a low voltage according to a result of comparing the tank pressure, the fuel flex factor, and the information sensed at the throttle position sensor with predetermined information, Or a high-voltage operation in two steps.

Preferably, in the step (c), the power applied to the fuel pump is turned off when the tank pressure exceeds 360 kPa, which is the predetermined information.

Preferably, the fuel control method further comprises: (d) comparing the tank pressure to 50 kPa when the tank pressure is equal to or less than 360 kPa.

Advantageously, step (d) comprises: (d1) operating the second relay in the fuel injection optimization module when the tank pressure is less than or equal to 50 kPa; (d2) operating the second relay; And (d3) controlling the fuel pump in the second step by applying 12V to the motor as the second relay is operated.

Preferably, the fuel control method further comprises the steps of: (d1) comparing the fuel pressure factor with the predetermined information when the tank pressure exceeds 50 kPa to operate the fuel pump; And further comprising:

Advantageously, the step (e) includes the steps of: (e1) applying 12V to the motor when the fuel flex factor exceeds 60%, which is the preset information, so that the fuel pump is controlled and operated in the two steps; And (e2) comparing the sensed information with the preset information if the fuel flex factor is less than or equal to 60%.

Preferably, in the step (e2), when the information sensed by the throttle position sensor exceeds 60%, which is the preset information, 12V is applied to the motor, Is controlled to operate in the two steps; And (g) when the information sensed by the throttle position sensor is less than or equal to 60%, 6 to 7 V is applied to the motor by the first relay so that the fuel pump is controlled to operate in the first stage and operated .

The present invention as described above has an effect of reducing the noise generated in the fuel pump by operating the fuel pump in a state where the fuel pump is reduced by 50% in the low engine load region.

Further, the present invention can control the fuel pump in one stage in the low engine load region and control the fuel pump in two stages in the high engine load region to efficiently burn the fuel.

1 is a flowchart of a two-stage fuel control method of a LPG gas injection type fuel pump according to an embodiment of the present invention, and Fig.
2 is a conceptual diagram showing the components for controlling the fuel pump applied in the two-stage fuel control method of the LPG gas injection type fuel pump of the present invention.

The components for implementing the two-stage fuel control method of the LPG gas injection type fuel pump of the present invention can be used integrally or individually as needed. In addition, some components may be omitted depending on the usage form.

A preferred embodiment of a two-stage fuel control method of a LPG gas injection type fuel pump according to the present invention will be described with reference to Figs. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.

Hereinafter, a two-stage fuel control method of the LPG gas injection type fuel pump according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

The two-stage fuel control method of the LPG gas injection type fuel pump according to the embodiment of the present invention is characterized in that (a) the fuel injection optimization module 130 controls the fuel pressure of the tank 110, the fuel flex factor, (B) loading the sensed information from tank 110 pressure, fuel flex factor, and throttle position sensor, (b) engine control module 140 loading the sensed information in tank pressure, fuel flex factor, And a step of controlling the fuel pump 112 to be turned off or to be operated in a low level or a high level in accordance with a result of comparing the information sensed by the throttle position sensor with preset information, .

Here, the fuel flex factor includes a function of fuel injection time and engine RPM.

First, in step (a), when the driver starts the vehicle, the pressure of the tank 110 is recognized by the pressure sensor 120 adjacent to the tank 110 while the power is applied, and the fuel flex factor, Check the information.

Next, as in step (b), the controller 110 receives the pressure, fuel flex factor, and information sensed by the throttle position sensor, which are stored in the engine control module 140.

Next, the step (c) includes turning off the power applied to the fuel pump 112 when the pressure of the tank 110 exceeds 360 kPa, which is predetermined information. The state at this time means that the fuel that has been previously supplied by the fuel pump 112 is sufficient in the state in which no additional fuel is required.

In addition, the fuel control method further includes the step (c) of: (d) comparing the pressure of the tank 110 to 50 kPa when the pressure of the tank 110 is 360 kPa or less.

More specifically, the step (d) includes: (d1) operating the second relay 152 in the fuel injection optimization module when the pressure of the tank 110 is less than or equal to 50 kPa, which is the reset information, (d2) And (d3) the second relay 152 is operated, 12V is applied to the motor 111 so that the fuel pump 112 is controlled in two steps and operated.

On the other hand, the fuel control method further includes a step (d1) of: (e) operating the fuel pump 112 by comparing the fuel flex factor with preset information when the pressure of the tank 110 exceeds 50 kPa .

The step (e) includes the steps of (e1) when the fuel flex factor exceeds 60%, which is predetermined information, 12V is applied to the motor 111 so that the fuel pump 112 is controlled in two steps, And (e2) comparing the sensed information with predetermined information in the throttle position sensor when the fuel flex factor is less than or equal to 60%.

If the information sensed by the throttle position sensor exceeds 60%, which is the preset information, 12V is applied to the motor 111 and the fuel pump 112 is operated. (G) when the information sensed by the throttle position sensor is 60% or less, the first relay 151 applies 6 to 7V to the motor 111 so that the fuel pump 112 is controlled in two steps .

When the first relay 151 operates, power is applied to the motor 111 via the resistor 160. When the second relay 152 operates, the voltage applied to the motor 111 is directly supplied to the motor 111 6 to 7 V and 12 V are applied to the motors to operate the fuel pump 112 according to the resistance difference as described above.

In summary, the fuel control method of the present invention stops the supply of additional fuel when the pressure inside the tank 110 is sufficient.

On the other hand, if the tank pressure exceeds 50 kPa and the fuel flex factor is 60% or less and the information sensed by the throttle position sensor is 60% or less, the fuel control is performed in the first step.

That is, the first relay 151 operates to operate the resistor 160, and a voltage of 6 to 7 V is applied to the motor 111 by the resistance of the resistor 160 to operate the fuel pump 112.

On the other hand, if the tank pressure is less than 50 kPa, or 2) the tank pressure is more than 50 kPa and the fuel flex factor is more than 60%, or 3) the tank pressure is less than 50 kPa and the fuel flex factor is less than 60% If the information is more than 60%, the fuel control is performed in two steps.

That is, in any one of the above three cases, the second relay 152 operates, and a voltage of 12 V is applied to the motor 111 to operate the fuel pump 112.

The fuel control method of the present invention described above operates the fuel pump 112 in two stages while confirming the pressure of the tank 110, the fuel flex factor, and the throttle position sensor in real time during the operation of the vehicle, thereby generating unnecessary combustion and noise There is an advantage to minimize.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

110: tank
111: Motor
112: fuel pump
120: Pressure sensor
130: fuel injection optimization module
140: Engine control module
150: Relay
151: first relay
152: second relay
160: Register

Claims (7)

(a) identifying a tank pressure, a fuel flex factor, and a throttle position sensor associated with the fuel pump by a fuel injection optimization module (FICM);
(b) loading an engine control module (ECM) with the sensed information from the tank pressure, the fuel flex factor, and the throttle position sensor; And
(c) the fuel pump is turned off or controlled to operate at a low voltage according to a result of comparing the tank pressure, the fuel flex factor, and the information sensed at the throttle position sensor with preset information, or A second step of operating at a high voltage,
(d1) operating the second relay in the fuel injection optimization module when the tank pressure is 50 kPa or less;
(d2) operating the first relay; And
(d3) the step of operating the fuel pump by controlling the fuel pump in the two steps by applying 12V to the motor as the second relay is operated.
Two - Stage Fuel Control Method of LPG Gas Injection Fuel Pump.
The method according to claim 1,
In the step (c)
And the power applied to the fuel pump is turned off when the tank pressure exceeds the preset information of 360 kPa.
Two - Stage Fuel Control Method of LPG Gas Injection Fuel Pump.
delete delete The method according to claim 1,
The fuel control method includes:
In the step (d1)
(e) operating the fuel pump by comparing the fuel flex factor with the predetermined information when the tank pressure is greater than 50 kPa. < RTI ID = 0.0 >
Two - Stage Fuel Control Method of LPG Gas Injection Fuel Pump.
6. The method of claim 5,
The step (e)
(e1) when the fuel flex factor exceeds 60%, which is the preset information, 12V is applied to the motor to control the fuel pump to operate in the two steps; And
(e2) comparing the sensed information with the preset information when the fuel flex factor is less than or equal to 60%.
Two - Stage Fuel Control Method of LPG Gas Injection Fuel Pump.
The method according to claim 6,
The fuel control method includes:
In the step (e2)
(f) when the information sensed by the throttle position sensor exceeds the preset information of 60%, 12V is applied to the motor to control the fuel pump to operate in the two steps; And
and (g) when the information sensed by the throttle position sensor is equal to or less than 60%, 6 to 7 V is applied to the motor by the first relay so that the fuel pump is controlled to operate in the first stage and operated As a result,
Two - Stage Fuel Control Method of LPG Gas Injection Fuel Pump.

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