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KR-102962205-B1 - APPARATUS AND METHOD FOR FILLING LPG FUEL OF BI-FUEL VEHICLE

KR102962205B1KR 102962205 B1KR102962205 B1KR 102962205B1KR-102962205-B1

Abstract

The present invention comprises a gasoline mixing chamber mounted on the side of an LPG cylinder, a gasoline fuel supply line connecting the gasoline mixing chamber and a fuel tank, wherein gasoline fuel moves to the gasoline mixing chamber as a first valve is opened, an LPG fuel supply line connecting the LPG cylinder and the gasoline mixing chamber, wherein LPG fuel moves to the gasoline mixing chamber as a second valve is opened, and a controller that controls the opening of the first valve and the recirculation of LPG fuel together with gasoline fuel to the LPG cylinder by means of the pressure of the LPG fuel moving to the gasoline mixing chamber when the internal pressure of the LPG cylinder reaches a preset reference pressure.

Inventors

  • 김창한
  • 지성환
  • 최승훈
  • 임준식

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260507
Application Date
20210322

Claims (13)

  1. Gasoline mixing chamber mounted on the LPG cylinder side; A gasoline fuel supply line connecting the above-mentioned gasoline mixing chamber and the fuel tank, wherein gasoline fuel moves to the above-mentioned gasoline mixing chamber as the first valve is opened; An LPG fuel supply line connecting the above LPG cylinder and the above gasoline mixing chamber, wherein LPG fuel moves to the above gasoline mixing chamber as the second valve opens; and A controller that controls the opening of the first valve as the internal pressure of the LPG cylinder reaches a preset reference pressure, and the recirculation of the LPG fuel together with the gasoline fuel to the LPG cylinder by means of the pressure of the LPG fuel moving to the gasoline mixing chamber; The above gasoline mixing chamber is, An LPG fuel filling device for a bifuel vehicle, characterized by being mounted on a quick coupling classified to a relatively low pressure from the LPG cylinder by a check valve installed on the LPG cylinder side.
  2. In Article 1, The above controller is, An LPG fuel filling device for a bifuel vehicle, characterized by blocking the first valve when a preset supply time elapses according to the capacity of the gasoline mixing chamber, and operating the LPI (Liquefield Petroleum gas Injection) pump installed in the LPG cylinder to open the second valve for supplying LPG fuel.
  3. In Article 1, The above controller is, An LPG fuel filling device for a bifuel vehicle, characterized in that when a preset supply time elapses according to the capacity of the gasoline mixing chamber, the first valve is shut off and the second valve is maintained in a shut-off state, and LPG fuel is introduced into the LPG cylinder together with the gasoline fuel contained in the gasoline mixing chamber using the filling pressure of the LPG charger.
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  5. In Article 1, The above gasoline mixing chamber is, A gasoline supply unit connected to the above gasoline fuel supply line; LPG supply unit connected to the above LPG fuel supply line; A body portion that receives together gasoline fuel and LPG fuel introduced through the gasoline supply portion and the LPG supply portion, respectively; and An LPG fuel filling device for a bifuel vehicle, characterized by having a discharge portion connected to the LPG cylinder so that, as LPG fuel is supplied to the body portion, gasoline fuel and LPG fuel move together to the LPG cylinder due to an increase in internal pressure.
  6. A comparison step that compares the internal pressure of the LPG cylinder with a preset reference pressure through a controller; A gasoline fuel supply step in which, if the internal pressure of the LPG cylinder in the comparison step exceeds a preset reference pressure, the first valve is opened through the controller to allow gasoline fuel to move to the gasoline mixing chamber along the gasoline fuel supply line; An LPG fuel supply step in which, while gasoline fuel is contained in the gasoline mixing chamber, a second valve is opened through the controller to allow LPG fuel to move into the gasoline mixing chamber; and A fuel recirculation step in which the LPG fuel is supplied to the LPG cylinder together with the gasoline fuel contained in the gasoline mixing chamber by means of the pressure of the LPG fuel moving to the gasoline mixing chamber; The above gasoline mixing chamber is, A method for filling LPG fuel of a bifuel vehicle, characterized by being mounted on a quick coupling classified at a relatively low pressure from the LPG cylinder by a check valve installed in the LPG cylinder.
  7. In Article 6, The above LPG fuel supply step is, A method for filling LPG fuel of a bifuel vehicle, characterized by blocking the first valve when a preset supply time elapses according to the capacity of the gasoline mixing chamber, and operating the LPI (Liquefield Petroleum gas Injection) pump installed in the LPG cylinder through the controller to open the second valve for supplying LPG fuel.
  8. In Article 7, The above LPG fuel supply step is, An LPI pump operation step of operating the LPI pump by blocking the first valve through the controller; and A method for filling LPG fuel of a bifuel vehicle, characterized by comprising: a second valve opening step that causes the LPG fuel contained in the above LPG cylinder to have pressure and be supplied to the above gasoline mixing chamber.
  9. In Article 8, The above fuel recirculation step is, A method for filling LPG fuel in a bifuel vehicle, characterized by having an LPI pump operation stop step that stops the operation of the LPI pump as the filling pressure of the LPG fuel becomes greater than the pressure of the LPG cylinder.
  10. In Article 6, The above LPG fuel supply step is, A method for filling LPG fuel of a bifuel vehicle, characterized by having a fueling mode determination step that blocks the first valve and determines whether to enter a fueling mode while gasoline fuel is contained in the gasoline mixing chamber.
  11. In Article 10, The above refueling mode determination step is, A method for refueling LPG in a bifuel vehicle, characterized by maintaining the closed state of the second valve when determining entry into the refueling mode, and using the charging pressure of the LPG charger to supply LPG fuel together with gasoline fuel contained in the gasoline mixing chamber to the LPG cylinder.
  12. In Article 10, The above refueling mode determination step is, A method for refueling LPG in a bifuel vehicle, characterized by determining that the above refueling mode has not been entered, and when a pre-set supply time based on the capacity of the above gasoline mixing chamber has elapsed, closing the above first valve, and operating the LPI pump installed in the above LPG cylinder through the above controller to open the above second valve in order to supply LPG fuel.
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Description

Apparatus and Method for Filling LPG Fuel of Bi-Fuel Vehicle The present invention relates to an LPG fuel filling device and method for a bi-fuel vehicle, and more specifically, to an LPG fuel filling device and method for a bi-fuel vehicle in which a gasoline mixing chamber is separately installed in an LPG cylinder, and gasoline is moved to the gasoline mixing chamber so that gasoline fuel and LPG fuel are selectively recirculated together into the LPG cylinder, thereby enabling cooling inside the LPG cylinder and reducing the vapor pressure of the LPG fuel, and thereby improving LPG refillability. Currently, LPG fuel vehicles are equipped with a fuel supply system that returns a portion of the LPG fuel supplied to the engine back to the LPG cylinder. In other words, since it is difficult to accurately control the actual amount of fuel supplied to the engine due to the phenomenon of some of the LPG fuel supplied to the engine vaporizing at high temperatures (vapor lock), a system is being applied to supply a sufficient amount of LPG fuel to the engine—more than is required for combustion—and return the remaining unburned fuel to the LPG cylinder, taking this into account. The charging process of such an LPG fuel vehicle is described with reference to FIG. 1 and consists of a step of driving a charging pump (2) at a charging station, a step of sending LPG fuel from an LPG storage (1) at the charging station to a charging gun (3) by driving the charging pump (2), and a step of charging LPG fuel into an LPG cylinder of a vehicle by the LPG charging pressure of the charging gun (3). At this time, there is a problem in that if the internal temperature and pressure of the LPG cylinder rise as unburned fuel (which has been heated by the high-temperature engine) supplied to the engine is returned to the LPG cylinder, it becomes impossible to refill the LPG fuel. In other words, if the internal temperature and pressure of the LPG cylinder rise above the pressure required to fill the cylinder with LPG fuel due to the high-temperature LPG fuel returned from the engine, there is a problem in that it becomes impossible to refill the LPG cylinder with LPG fuel from the filling gun. Moreover, under conditions where the external temperature rises rapidly due to extreme heat, the pressure inside the LPG cylinder becomes higher than the LPG filling pressure, which makes LPG fuel filling even more impossible. Figure 1 is a schematic diagram illustrating the charging process of an LPG vehicle. FIG. 2 is a drawing for showing a gasoline system for an LPG fuel filling device of a bi-fuel vehicle according to an embodiment of the present invention. FIG. 3 is a drawing for showing an LPG system for an LPG fuel filling device of a bi-fuel vehicle according to an embodiment of the present invention. Figure 4 is a schematic diagram illustrating the layout of the LPG-gasoline bifuel system structure of a conventional LPG vehicle. FIG. 5 is a drawing for showing a first embodiment of an LPG fuel charging device for a bi-fuel vehicle according to an embodiment of the present invention. FIG. 6 is a drawing for showing a second embodiment of an LPG fuel filling device for a bi-fuel vehicle according to an embodiment of the present invention. FIG. 7 is a drawing for showing a gasoline mixing tank for an LPG fuel filling device of a bifuel vehicle according to an embodiment of the present invention. FIG. 8 is a drawing for sequentially showing a first embodiment of an LPG fuel charging method for a bi-fuel vehicle according to another embodiment of the present invention. FIG. 9 is a diagram showing the change in internal pressure of an LPG cylinder relative to the ratio of gasoline fuel and LPG fuel for an LPG fuel charging method of a bifuel vehicle according to another embodiment of the present invention. FIG. 10 is a drawing for sequentially showing a second embodiment of an LPG fuel charging method for a bi-fuel vehicle according to another embodiment of the present invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. The advantages and features of the present invention and the method for achieving them will become clear by referring to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited by the embodiments disclosed below but may be implemented in various different forms, and these embodiments are provided merely to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. In addition, in describing the present invention, if it is determined that related known technologies, etc., may obscure the essence of the present invention, a detailed explanation thereof will be omitted. FIG. 2 is a drawing for showing a gasoline system