KR20000004508U - Fuel supply device with improved acceleration response in Elpji vehicles - Google Patents

Abstract

The present invention relates to a fuel supply device for an LPI vehicle having an improved acceleration characteristic to respond to rapid acceleration of an acceleration pedal. Said fuel supply apparatus is the fuel supply apparatus of the Elphi vehicle provided with the vapor riser which has a primary pressure chamber and the secondary pressure chamber which adjusts the pressure of the elf-fuel fuel depressurized by the said primary pressure chamber to atmospheric pressure level, The said secondary pressure A mixer for mixing the LPG fuel supplied through the low pressure pipe connected to the chamber and the air through the intake pipe; A collector for supplying a high pressure fuel input to the mixer and the high pressure inlet from the mixer to the engine; A duty solenoid valve connected between the primary pressure chamber of the vaporizer 12 and the high pressure inlet of the collector and opened and closed by a duty control signal to supply the high pressure LLP fuel in the primary pressure chamber to the high pressure inlet of the collector; And a control unit for driving the duty solenoid valve at a duty ratio corresponding to an accelerator opening amount.

Description

Fuel supply device with improved acceleration response in Elpji vehicles

The present invention relates to a fuel supply device for an LPG vehicle, and more particularly, to an fuel supply device for an LPG vehicle having an improved acceleration characteristic to respond to rapid acceleration of an acceleration pedal at high speed.

In general, a vehicle using LPG as a fuel includes a vaporizer which discharges the pressure of LPG flowing from a fuel cylinder (not shown) to atmospheric pressure according to the pressure reduction, vaporization, and pressure action, and LPG supplied by adjusting the atmospheric pressure from the vaporizer. It has a mixer that mixes fuel and air. At this time, the primary pressure chamber of the vaporizer is a high pressure of about 0.325kg / ㎠, the secondary pressure chamber has a function to adjust the pressure of the Elpgi to the atmospheric pressure level. The vaporizer and the mixer are connected with a low pressure hose. The construction of the LPG fuel supply device is described in great detail on pages 241 to 257 of the "Automotive Electronic Control Textbook (Basic)" published on March 12, 1995 by the book publisher Golden Bell.

Referring to FIG. 1, a vaporizer 12 having a primary pressure chamber and a secondary pressure chamber for regulating the pressure of the Elpji fuel supplied from a fuel cylinder (not shown) to the primary and secondary pressures, the air supplied from the suction pipe 13, and the vaporizer 12 Mixer 14 for mixing the Elpji fuel pressure adjusted to the atmospheric pressure level in the secondary pressure chamber of, and the low pressure pipe 16 and the low pressure pipe 16 connected between the secondary pressure chamber of the vaporizer 12 and the mixer 14 in parallel to the duty control A duty solenoid valve 18 which is driven by and supplies the atmospheric pressure LLP fuel to the mixer 14, a collector 20 positioned below the mixer 16 to reduce intake pulsation, and an LLP fuel supplied from the collector 20. An operating engine 22 is shown.

First, before describing the fuel supply process according to the related art with reference to FIG. 1, the Elpji fuel required for idling rotation is supplied to the mixer 14 through the cylinder 10, the primary pressure chamber and the secondary pressure chamber of the vaporizer 12, and the low pressure tube 16. It is assumed that this is a state in which

When an accelerator pedal (not shown) is stepped in and stepped in by a driver's operation, a depression amount of the accelerator pedal is detected by a throttle position sensor (not shown). The detected pedal depression amount is supplied to an ECU 5, and the ECU 5 outputs a signal for controlling the opening degree of the throttle valve 15 in the mixer 14 in advance in response to the input accelerator depression amount. Outputs the set duty solenoid valve drive signal DSVD.

For example, a large amount of depression of the accelerator pedal supplies a signal having a duty for driving the duty solenoid valve 18 for a relatively long time. On the contrary, if the accelerator pedal has a small depression amount, a signal having a duty for driving the duty solenoid valve shortly is supplied.

Therefore, the conventional LLP fuel supply device having the structure as shown in FIG. 1 controls the " on " duty of the duty solenoid valve 18 connected between the secondary pressure chamber of the vaporizer 12 and the mixer 14 according to the depression amount of the accelerator pedal to increase the fuel amount. It can be seen that.

However, the conventional fuel amount control device having the structure as shown in FIG. 1 provides fuel to the mixer 14 through the duty solenoid valve 18 through the duty solenoid valve 18 with the fuel flowing out of the secondary pressure chamber of the vaporizer 12 that regulates the amount of Elpgi fuel at about the same level as atmospheric pressure. The fuel was not supplied in response to the accelerator pedal depression.

In other words, by supplying the fuel in the secondary pressure chamber of the vaporizer 12 having a pressure almost equal to the atmospheric pressure to the mixer 14 by the negative pressure of the engine, when the throttle valve 15 is opened by the depression of the accelerator pedal, the venturi part of the venturi part There is a case where the fuel supply by the air flow rate is not made immediately.

Accordingly, an object of the present invention is to provide a fuel amount supply control device for controlling the amount of fuel supplied to the engine to be accelerated at high speed in accordance with the depression amount of the accelerator pedal.

Another object of the present invention is to provide an apparatus for supplying fuel amount of an Elphi vehicle, which improves a response time by supplying an collector of Elphi fuel in a primary pressure chamber of a vaporizer having a relatively high pressure when acceleration is detected.

In order to achieve the above object, the present invention provides a fuel supply apparatus for an LPG vehicle having a primary riser and a vapor riser having a secondary pressure chamber that adjusts the pressure of the LPG fuel decompressed by the primary pressure chamber to an atmospheric pressure level. A mixer for mixing the Elpji fuel supplied through the low pressure pipe connected to the secondary pressure chamber and the air through the intake pipe; A collector for supplying a high pressure fuel input to the mixer and the high pressure inlet from the mixer to the engine; A duty solenoid valve connected between the primary pressure chamber of the vaporizer 12 and the high pressure inlet of the collector and opened and closed by a duty control signal to supply the high pressure LLP fuel in the primary pressure chamber to the high pressure inlet of the collector; And a control unit for driving the duty solenoid valve at a duty ratio corresponding to an accelerator opening amount.

1 is a view showing a fuel supply opening of an LLP vehicle according to the prior art.

Figure 2 is a view showing the configuration of the fuel supply system of the LLP vehicle configured according to the present invention, which shows the configuration of supplying the fuel of the primary pressure chamber of the vaporizer directly to the collector during acceleration.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to obscure the subject matter of the present invention.

Figure 2 is a view showing the configuration of the fuel supply system of the LLP vehicle configured according to the present invention, which shows the configuration of supplying the fuel of the primary pressure chamber of the vaporizer directly to the collector during acceleration. Referring to FIG. 2, a duty solenoid valve 18, which is opened and closed in response to a duty control signal output from ECU 5, a control unit, is connected between the primary pressure chamber of the vaporizer 12 and the collector 20, and the high pressure inlet or the duty solenoid of the collector 20 is connected. At the outlet side of the fuel pipe connected to the valve 18, a swirler is added for efficiently distributing fuel into the collector 20.

In addition, the ECU 5 shown in FIG. 2 is masked with a program for detecting how much the depression amount of the accelerator pedal is changed within a predetermined time, and the program for detecting the change of depression amount of the accelerator pedal is an output of a throttle position sensor. It is called and operated by the change of. In the ECU 5, a duty control program set differently according to the opening amount of the throttle valve is set.

Before describing the operation of the apparatus according to the present invention with reference to FIG. 2, the Elpji fuel necessary for idling rotation is supplied to the mixer 14 through the primary pressure chamber and the secondary pressure chamber of the vaporizer 12 and the vaporizer 12 and the low pressure tube 16. Explain under the assumption.

Now, when an accelerator pedal (not shown) is stepped in and stepped in by a driver's operation, the depression amount of the accelerator pedal is detected by a throttle position sensor (not shown). The detected pedal depression amount is supplied to an ECU 5, and the ECU 5 detects a degree of change in the input accelerator depression amount.

For example, if the change in the depression amount is large within the preset time, it is determined that it is a rapid acceleration state.

When it is determined that the search result is the rapid acceleration state, the ECU 5 determines the operation time and the opening degree of the duty solenoid valve 18 according to a preset value according to the opening amount of the throttle valve, and has a duty ratio corresponding to the determined state. Outputs the drive control signal DSVD. Therefore, it can be seen that the solenoid valve 18 shown in FIG. 2 is opened and closed in accordance with the opening amount of the throttle valve by the control of the ECU 5.

When the duty solenoid valve 18 is opened and closed, the high-pressure lpage fuel having a pressure of about 0.35 cm 2 / kg is directly supplied to the collector 20 by the primary pressure chamber of the vaporizer 12. At this time, the high pressure fuel inlet of the collector 20 or the outlet side of the fuel pipe connected to the duty solenoid valve 18 is provided with a swirler is injected to distribute the high-pressure fuel supplied into the collector 20.

Therefore, the elbow fuel supply device having the configuration as shown in FIG. 2 can accelerate the acceleration response speed by directly injecting the high-pressure vellum fuel adjusted in the primary pressure chamber of the vaporizer to the collector when the accelerator pedal is pressed for acceleration. have.

As described above, the present invention can improve the exhaust performance by improving the response speed during acceleration by supplying fuel directly to a surge tank such as a collector through the high pressure LP of the vaporizer during acceleration, and at the same time, the acceleration and deceleration can be improved.

Claims (2)

A fuel supply apparatus for an Elphi vehicle having a vapor riser having a primary pressure chamber and a secondary pressure chamber that adjusts the pressure of the Elpji fuel decompressed by the primary pressure chamber to an atmospheric pressure level. A mixer for mixing the Elpji fuel supplied through the low pressure pipe connected to the secondary pressure chamber and the air through the intake pipe; A collector for supplying a high pressure fuel input to the mixer and the high pressure inlet from the mixer to the engine; A duty solenoid valve which is opened and closed by a duty control signal and supplies a high pressure LLP fuel in a primary pressure chamber to a high pressure inlet of the collector; And a control unit for driving the duty solenoid valve at a duty ratio corresponding to an accelerator opening amount. The fuel supply device of claim 1, wherein the high pressure inlet of the collector is provided with a swirler for improving fuel distribution.