KR20170039398A - Fuel supply control apparatus and method of lpdi type altered vehicle - Google Patents

Abstract

The present invention relates to a fuel supply control apparatus of a vehicle modified in an LPG direct injection (LPDI) type and a control method thereof, and comprises a bombe in which fuel is stored, a fuel pump which is installed inside the bombe and pumps the fuel, a high pressure pump which pressurizes the fuel provided by pumping from the fuel pump and provides the fuel to a high pressure fuel rail, and a control unit which controls a drive of the fuel pump based on a current fuel consumption amount received via communication with a main control unit of a vehicle. Therefore, the vehicle which is modified from a gasoline direct injection type to an LPDI type, is equipped with the control unit separate from the main control unit so that the drive of the fuel pump can be controlled in accordance with a driving state of the vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fuel supply control apparatus and a control method of a direct injection type ELPHY child-

The present invention relates to a fuel supply control device and a control method for a direct injection type Elfee remodeled vehicle, and more particularly, to a fuel supply control device and a control method of a direct injection type Elfie remodeled vehicle, To a fuel supply control device and a control method of a spray type ELFY modified vehicle.

Generally, among the fuels used in vehicles, the LPG has a feature of high octane number and excellent heat resistance, and an advantage of low fuel cost, so that it is used in passenger cars, vans and the like, and is also applied to large vehicles.

When the gasoline is supplied to the engine of the vehicle, it is liquid, and when it is vaporized, it is mixed with the air and the flammability is set. Therefore, knocking does not occur more easily than gasoline and diesel. Vapor-lock or percolation It is possible to prevent the occurrence of the same phenomenon, and the range of application as an alternative fuel for gasoline or diesel fuel is gradually increasing.

Therefore, gasoline and LPG vehicles are equipped with gasoline fuel tanks, Vaporizer and Mixer, Elfie fuel tanks, solenoid valves to control the supply of LPG fuel, and electronic control units ).

In recent years, in order to improve the output of the engine and to reduce the emission of contaminants, a gasoline direct injection engine (hereinafter referred to as "Gasoline Direct Injection") which injects only air into the engine and compresses the gasoline, (Hereinafter referred to as " Liquefied Petroleum Injection ") type direct injection type ELFIA engine is being developed.

Accordingly, in order to achieve both of environmental protection and fuel consumption reduction which are gradually strengthened, development of a fuel supply control device for a gasoline, an LPG, and a gasoline LPG using a direct injection method is under development.

For example, the present applicant has filed and filed a fuel supply control device technology of a direct injection type ELFI system and an ELFIGO gasoline vehicle in many of the following Patent Documents 1 and 2 and the like.

Korean Patent Registration No. 10-1261836 (issued on May 7, 2013) Korean Patent Registration No. 10-1261831 (issued on May 8, 2013)

However, in the case of retrofitting a vehicle to which the conventional gasoline direct injection type engine is applied by a direct injection type fuel injection system, it is impossible to modify the program of the electronic control unit for controlling the driving of the gasoline fuel supply device, Separate drive logic is required.

Accordingly, when a vehicle to which a gasoline direct injection type engine is applied is directly converted to a spray type LPI system, a technique for driving the fuel pump in accordance with the driving state of the vehicle and the operating state of the fuel supply system is required.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a fuel supply control device of a direct injection type ELFY modified vehicle in which a vehicle to which a gasoline direct injection type engine is applied is converted into a direct injection type ELFY type, And a control method.

It is another object of the present invention to provide a fuel supply control device and a control method of a direct injection type ELPHI remodeling vehicle that controls driving of a fuel pump based on current fuel consumption amount.

It is still another object of the present invention to provide a fuel supply control device and a control method of a direct injection type El Pee eye remodeled vehicle which can prevent the collision and start-up of the engine due to the vaporization of the liquefied fuel due to the heat of the engine.

In order to accomplish the above object, the fuel supply control apparatus of the direct injection type ELF child remodeling vehicle according to the present invention comprises a cylinder for storing fuel, a fuel pump for pumping fuel installed in the cylinder, Pressure fuel rail, and a control unit for controlling the driving of the fuel pump based on the current fuel consumption amount received through communication with the main control unit of the vehicle .

The present invention further includes a storage unit for storing a CAN communication unit for receiving the current fuel consumption amount through communication with the main control unit and a table mapping a motor rotation speed of the fuel pump for each fuel consumption amount of the engine, The control unit controls the motor rotational speed of the fuel pump according to the motor rotational speed corresponding to the current fuel consumption amount received from the fuel pump.

The control unit may linearly increase or decrease the motor rotation speed according to the current fuel consumption amount, or may control the motor rotation speed according to a predetermined number of control steps.

Wherein the control unit drives the fuel pump at a predetermined initial rotation speed for a preset initial time set at the time of starting the engine and controls the fuel pump to be driven at a preset minimum rotation speed while the ignition key is on do.

In order to achieve the above object, the fuel supply control method of the direct injection type ELPHI type remodeling vehicle in the gasoline direct injection system according to the present invention is characterized in that (a) when power is supplied by the ON operation of the ignition key, Driving the motor of the fuel pump at a predetermined initial rotational speed for a predetermined initial set time; (b) when the initial set time has elapsed, (C) receiving the current fuel consumption amount from the main control unit of the vehicle using the CAN communication unit, and (d) controlling the motor rotation speed of the fuel pump based on the current fuel consumption amount received by the control unit .

In the step (d), the controller controls the motor rotation speed using the motor rotation speed table mapped according to the fuel consumption amount.

In the step (d), the control unit controls the motor rotational speed of the fuel pump to increase or decrease at a rotational speed corresponding to any one of a plurality of stages preset for fuel consumption amount.

According to the fuel supply control apparatus and the control method of the direct injection type Elpie child remodeling vehicle according to the present invention, the vehicle modified from the gasoline direct injection system to the direct injection type Elpie system is provided with a control unit separately from the main control unit, The effect of being able to control the driving of the fuel pump is obtained.

Particularly, according to the present invention, it is possible to improve the fuel efficiency by optimizing the supply amount and the supply timing of the fuel supplied to the engine by controlling the fuel pump based on the amount of fuel consumed from the main control unit through the CAN communication .

According to the present invention, as the fuel consumption amount is reduced in the idling state of the vehicle, the effect of being able to reduce the motor rotation speed of the fuel pump to improve the fuel consumption and reduce the noise due to the fuel pump drive can be obtained.

According to the present invention, in the ignition key-on state, since the fuel pump is always driven at a predetermined minimum rotational speed or more, it is possible to prevent the collision of the engine and the ignition off due to the vaporization of the LPF due to the heat of the engine Effect is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a fuel supply control apparatus of a direct injection type ELPHI remodeling vehicle according to a preferred embodiment of the present invention,
2 is a graph showing the fuel consumption per RPM of the engine,
3 is a flowchart for explaining steps of a fuel supply control method of a fuel supply control apparatus of a direct injection type Elphin Eye modified vehicle according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fuel supply control apparatus and a control method of a direct injection type ELPHI remodeling vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a fuel supply control apparatus of a direct injection type ELPHI remodeling vehicle according to a preferred embodiment of the present invention.

First, a description will be given of a case where the present invention is applied to a vehicle in which an existing gasoline direct injection engine is converted into a direct injection type ELFI system.

Accordingly, the direct injection type ELFY modified vehicle is provided with a gasoline supply system such as a high-pressure fuel rail 14, an injector (not shown), and a fuel supply line S, which are applied to an existing gasoline direct injection type engine.

As shown in FIG. 1, the fuel supply control apparatus 10 of the direct injection type ELF child remodeling vehicle according to the preferred embodiment of the present invention includes a cylinder 11 in which fuel is stored, A high pressure pump 15 that pressurizes the fuel supplied by the pumping operation of the fuel pump 12 to a predetermined high pressure state and supplies the fuel to the high pressure fuel rail 14, A regulator unit 13 for delivering the fuel to the high-pressure pump 15 and maintaining the pressure of the fuel recovered in the high-pressure pump 15 at a preset pressure, and a control unit And a control unit 20 that receives the consumption amount and controls driving of the fuel pump based on the received current fuel consumption amount.

In addition, the fuel supply control device 10 of the direct injection type ELF child remodeling vehicle according to the preferred embodiment of the present invention includes a CAN communication unit 21 which is communicably connected to the main control unit 30 of the vehicle and receives the current fuel consumption amount, As shown in FIG.

The main control unit 30 may be provided as an engine control unit that receives detection signals of various sensors provided in the vehicle and controls driving of the engine based on the received sensing signals.

Between the fuel pump 12 and the high-pressure fuel rail 30, a fuel supply line S for supplying the fuel supplied by the pumping operation of the fuel pump 12 in the cylinder 11 to the engine (not shown) And the regulator unit 13 and the high-pressure pump 15 can be installed on the fuel supply line S.

The cylinder 11 is provided with a pressure-resistant high-pressure gas container for storing the liquid state LPG fuel, and can be formed into a substantially cylindrical shape.

A charging pipe 16 is connected to one side of the cylinder 11 and a charging filter 17 for removing impurities or impurities contained in the fuel charged in the cylinder 11 may be provided on the charging pipe 16. [

The other side of the cylinder 11 may be provided with a multi-valve 18 for selectively delivering the fuel pumped by the fuel pump 12.

The fuel supply line S may be provided with a fuel filter 19 for removing impurities or impurities contained in the fuel supplied to the regulator unit 13 between the regulator unit 13 and the multi-valve 18.

The high-pressure pump 15 functions to pressurize the fuel supplied through the fuel supply line S to a preset high-pressure state and supply the pressurized fuel to the high-pressure fuel rail 14. [

For example, the high-pressure pump 15 may pressurize a portion of the fuel supplied through the regulator unit 13 to a high-pressure fuel rail 14, for example, from about 40 bar to about 150 bar.

The high-pressure pump 15 may be supplied to the high-pressure fuel rail 14 and recovered to the cylinder 11 through the fuel recovery line R at a low pressure before the surplus fuel is pressurized to the high-pressure state.

The regulator unit 13 includes a cut solenoid valve (not shown) that is opened and closed to supply or block fuel supplied from the fuel pump to the high-pressure pump side, a temperature sensor (not shown) that detects the temperature of the fuel supplied to the high- A pressure sensor (not shown) for sensing the pressure of the fuel recovered from the high-pressure pump 15 and a regulator (not shown) for maintaining the pressure of the fuel recovered in the high-pressure pump 15 constant at a predetermined set pressure Time).

The regulator may maintain the pressure of the pumped fuel recovered in the cylinder 11 at a predetermined set pressure, e.g., cylinder pressure +? 5 bar.

The set pressure is preset to prevent vaporization by pressurizing the fuel recovered to the cylinder 11 through the fuel recovery line R to achieve thermal equilibrium inside the cylinder 11. [

Accordingly, the fuel delivered by the fuel pump 12 and the fuel recovered from the high-pressure pump 15 are thermally balanced within the cylinder 11.

2 is a graph showing the fuel consumption per RPM of the engine.

As shown in FIG. 2, the fuel consumption gradually increases at a low load interval of about 2000 RPM or less, but increases sharply at a high load interval of about 3000 RPM or more.

Therefore, in this embodiment, the control unit 20 adjusts the pumping speed of the fuel pump according to the fuel consumption amount of the engine.

To this end, the control unit 20 stores a table in which the motor rotational speed of the fuel pump 12 is mapped in accordance with the fuel consumption amount of the engine according to the experimental values, in the storage unit 20, and, according to the current fuel consumption amount received via the CAN communication And controls the motor rotational speed of the fuel pump 12. [

For example, the control unit 20 can control the rotational speed of the motor in a plurality of preset stages, for example, five stages according to an experimental result using an actual product.

Table 1 is a table showing the rotation speed of the motor provided in the fuel pump according to the number of stages.

division Rotation speed 1st stage 500 2nd stage 1000 3rd stage 1500 4 stage 2000 5 stage 2800

As shown in Table 1, the controller 20 can control the rotation speed of the motor by dividing the driving of the motor into the first to fifth stages set at about 500 RPM, 1000 RPM, 1500 RPM, 2000 RPM, and 2800 RPM, respectively, have.

For example, the control unit 20 controls the motor rotational speed of the fuel pump 12 to decrease as the fuel consumption amount is decreased in the idling state of the vehicle, and when the fuel consumption amount increases, Can be controlled to increase.

As described above, according to the present invention, as the amount of fuel consumed in the idling state of the vehicle is reduced, the rotational speed of the motor of the fuel pump can be reduced to improve the fuel economy and reduce the noise caused by driving the fuel pump.

Here, the controller 20 can control the motor to be driven at about 400 RPM to 500 RPM or more set in at least one stage in consideration of the characteristics of the LPG fuel vaporized by the temperature rise.

 When the fuel is vaporized by the heat of the engine in the state where the driving of the fuel pump 12 is stopped, it becomes a main cause of generating the engine stall and the starting off.

Accordingly, in the present invention, when the ignition key is turned on, the fuel pump is always driven at a minimum of one stage, that is, about 400 RPM to 500 RPM to prevent engine braking and starting off caused by vaporization of fuel by heat of the engine can do.

The controller 20 controls the fuel pump 12 to supply fuel to the fuel supply line S, the high-pressure pump 15 and the high-pressure fuel rail 14 at an early stage of engine startup, The motor can be controlled to be driven at an initial rotational speed, for example, about 2000 RPM corresponding to four stages.

For example, the initialization time may be set to about 3 to 7 seconds. Of course, the initial setting time can be variously changed according to the specifications of the fuel pump 12 or the motor, and the specifications of the engine.

Of course, the control unit 20 may further control the driving of the motor by further subdividing the number of control stages, and may control to increase or decrease the rotation speed of the motor linearly in accordance with an experiment result using an actual product.

To this end, the control unit 20 includes a motor driving unit (not shown) for driving the motor provided in the fuel pump 12 and a motor for generating a control signal to the motor driving unit to adjust the rotational speed of the motor based on the present fuel consumption amount. Controller (not shown).

The control unit 20 is integrally provided on one side of the cylinder 11, for example, the multi-valve 18 or separately provided so as to minimize the influence of electromagnetic waves generated in the vehicle by minimizing the distance to the fuel pump 12, Can be installed.

Next, a fuel supply control method of the fuel supply control apparatus of the direct injection type ELPHI remodeling vehicle according to the preferred embodiment of the present invention will be described in detail with reference to FIG.

3 is a flowchart for explaining the fuel supply control method of the fuel supply control apparatus of the direct injection type ELPHI remodeling vehicle according to the preferred embodiment of the present invention step by step.

When the ignition key is turned on in step S10 of FIG. 3, the controller 20 receives power from the battery and starts driving.

At this time, the controller 20 controls the fuel pump 12 for a predetermined initial set time so as to quickly supply the fuel to the fuel supply line S, the high-pressure pump 15 and the high-pressure fuel rail 14 at the start of the engine. To be driven at about 2000 RPM, that is, four stages (S12).

When the initial set time has elapsed, the control unit 20 controls the motor of the fuel pump 12 to drive at the minimum rotation speed of the first stage (S14).

Accordingly, in the present invention, when the ignition key is turned on, the fuel pump is always driven at a temperature of at least about 400 to 500 RPM or more to prevent the fuel tank from being turned off .

Through the above process, when the fuel pump 12 is driven, the CAN communication unit 21 receives the current amount of fuel consumption from the main control unit 30 of the vehicle through the CAN communication, and transfers it to the control unit 20 (S16).

In step S18, the control unit 20 checks whether or not the received fuel consumption amount changes.

If the fuel consumption is changed as a result of the test in step S18, the control unit 20 searches the motor rotation speed of the fuel pump 12 corresponding to the changed fuel consumption amount in the table stored in the storage unit 22, (Step S20).

For example, the control unit 20 can control the motor to rotate at a rotational speed set to any one of a plurality of stages, that is, a control stage divided into a first stage to a fifth stage according to the current fuel consumption amount.

In step S22, the control unit 20 checks whether the engine start is stopped and the power supply is interrupted by turning off the ignition key.

If it is determined in step S22 that the ignition key remains on continuously, the control unit 20 controls the control unit 20 to repeat steps S16 to S22.

On the other hand, if it is determined in step S22 that the ignition key is turned off, the control unit 20 stops driving the fuel pump 12 and terminates the process.

On the other hand, when the engine is restarted, the control unit 20 repeats steps S10 to S24, and controls the fuel pump 12 to be driven in four stages during the initial set time, especially at the beginning of the restart.

Through the above-described process, the present invention can control the driving of the fuel pump according to the traveling state of the vehicle by providing a control unit separately from the main control unit in the vehicle modified from the gasoline direct injection method to the direct injection type LPI system.

Although the invention made by the present inventors has been described concretely with the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a technique of providing a separate control unit for CAN communication with a main control unit in a vehicle modified from a gasoline direct injection system to a direct injection type ELFI system and controlling driving of the fuel pump according to the running state of the vehicle.

10: Fuel supply control device of direct injection type Elpie's remodeling vehicle
11: Bomb 12: Fuel pump
13: Regulator unit 14: High-pressure fuel rail
15: High pressure pump 16: Charging pipe
17: Charging filter 18: Multi-valve
19: fuel filter 20:
21: CAN communication unit 22:
30:

Claims (7)

1. A fuel supply control device for a vehicle, which is adapted from a gasoline direct injection system to a direct injection type fuel injection system,
The bomb,
A fuel pump installed in the cylinder to pump the fuel,
A high-pressure pump which pressurizes the fuel supplied by the pumping operation of the fuel pump to a predetermined high-pressure state and supplies the high-pressure fuel rail to the high-
And a control unit for controlling driving of the fuel pump based on a current fuel consumption amount received through communication with the main control unit of the vehicle. The method according to claim 1,
A CAN communication unit for receiving the current fuel consumption amount through communication with the main control unit,
Further comprising: a storage unit for storing a table mapping the motor rotational speed of the fuel pump for each fuel consumption amount of the engine,
Wherein the control unit controls the motor rotation speed of the fuel pump in accordance with the motor rotation speed corresponding to the current fuel consumption amount received in the storage unit. The method according to claim 1,
Wherein the control unit controls the motor rotation speed in accordance with a preset number of control steps or linearly increases or decreases the motor rotation speed according to the current fuel consumption amount, . 4. The method according to any one of claims 1 to 3,
Wherein the control unit drives the fuel pump at a predetermined initial rotation speed for a preset initial set time at the start of the engine,
And controls the fuel pump to drive at least the predetermined minimum rotational speed while the ignition key is in the on-state. A fuel supply control method of a vehicle modified from a gasoline direct injection system to a direct injection type ELIE system,
(a) driving the motor of the fuel pump at a preset initial rotational speed for a predetermined initial set time, when power is supplied by an on-operation of the ignition key,
(b) driving the motor of the fuel pump at a predetermined minimum rotational speed by the control unit when the initial set time has elapsed,
(c) receiving the current fuel consumption amount from the main control unit of the vehicle using the CAN communication unit and
(d) controlling the motor rotational speed of the fuel pump based on the current fuel consumption amount received by the control unit. 6. The method of claim 5,
Wherein the control unit controls the motor rotation speed using the motor rotation speed table mapped according to the fuel consumption amount in the step (d). 6. The method of claim 5,
Wherein the control unit controls the motor rotational speed of the fuel pump to increase or decrease at a rotational speed corresponding to any one of a plurality of stages preset for each fuel consumption amount in the step (d) Control method.

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