(19)
(11)EP 3 578 784 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
11.12.2019 Bulletin 2019/50

(21)Application number: 19460028.4

(22)Date of filing:  31.05.2019
(51)International Patent Classification (IPC): 
F02D 19/06(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 05.06.2018 PL 42582218

(71)Applicant: Certools Spólka Jawna Piotr Czekalski Krzysztof Hanke
95-200 Pabianice (PL)

(72)Inventors:
  • Czekalski, Pawel
    95-200 Pabianice (PL)
  • Hanke, Krzysztof
    95-200 Pabianice (PL)
  • Czekalski, Piotr
    95-200 Pabianice (PL)

(74)Representative: Dziubinska, Joanna 
Kancelaria Patentowa ul. Wyszynskiego 58 m 25
94-047 Lodz
94-047 Lodz (PL)

  


(54)PETROL/DIESEL AND LPG FUEL SUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINES


(57) The subject of the invention is a system of supplying combustion engines with fuel, alternately with petrol / diesel oil or LPG, especially engines with multi-point or direct injection.
According to the invention, in the supply system there is a petrol / diesel oil tank 1 and a LPG tank 2. A sealed glass 3 is placed in the LPG tank 2, which by its upper plate 4 is fixed in the upper plate 5 of the cup 6, placed in the LPG tank 2, At the inlet to the sealed glass 3 there is a solenoid valve 7, which controls the switching of fuel from petrol/diesel oil to LPG. To one input of the solenoid valve 7 there is supplied petrol / diesel oil through solenoid valve 13, and to the second input LPG is supplied - the electrovalve 7 opens the LPG flow instead of gasoline / diesel oil and vice versa. From the sealed glass 3 fuel: petrol / diesel or LPG is fed to the high pressure pump 8 and then to the engine 9. The low pressure branch at the outlet of the high pressure pump 8 is connected to the manifold 10 of the small and big fuel circuit. The small circuit valve 11 is connected to the sealed glass 3, whereas the large circuit valve 12 is connected to the LPG tank 2.




Description


[0001] The subject of the invention is a system of supplying combustion engines with fuel, alternately with petrol / diesel oil or LPG, especially engines with multi-point or direct injection.

[0002] The description of the Polish invention No. PL222798 presents a system supplying combustion engines with fuels such as petrol/diesel oil and interchangeably LPG. This system consists of a pump feeding fuel to the high pressure pump and a multivalve controlling the change of fuel in the supply system. In the LPG tank there is a pump, ahead of which a fuel type switch is placed, from this pump the fuel is fed to the high pressure pump. Downstream the high pressure pump, which feeds fuel directly to the engine, on the return pipe connecting the high pressure pump with the LPG tank, a return valve is located which receives signals from the sensors measuring the fuel pressure and temperature. In a situation when LPG is in the supply system, the correct pressure and temperature are maintained. When in the system there is petrol / diesel oil, these parameters change and it is necessary to switch on the damping nozzle and change the pump efficiency in the LPG tank. When switching from LPG supply to petrol / diesel oil, the flow opens to bypass the damping nozzle and the fuel system is quickly emptied from LPG (burn-out). When petrol reaches the high-pressure pump, pressure and temperature sensors give signals and the return valve closes the return line, thus shutting off the fuel supply to the LPG tank. When switching back to the LPG supply, the return valve opens and there is flow through the damping nozzle.

[0003] According to the invention system supplying combustion engines with fuel, alternately with petrol / diesel oil or LPG, is characterized in that in the LPG tank in a sealed glass isolated from the LPG tank a low pressure pump is placed, which at the input is equipped with elecrovalve as a fuel change switch from petrol / diesel oil to LPG, wherein the low pressure branch at the outlet of the high pressure pump feeding the engine is connected to the manifold of the small and big fuel circuit, in which the small circuit valve is connected to the inlet of the low pressure pump in a sealed glass and the big circuit valve is connected to the LPG tank, where the petrol / diesel oil is supplied to the inlet of the sealed glass via the electrovalve.

[0004] Sealed glass is placed in the LPG tank via the cup, the sealed glass being the upper plate attached to the main plate of the cup.

[0005] On the main plate of the cup on the LPG return line a non-return valve is mounted to block gas outflow from the LPG tank and on the LPG supply line to the low pressure pump a manual shut-off valve is installed.

[0006] In the manifold of the small and big circuit a manual service valve is mounted.

[0007] The system according to the invention makes it possible to quickly change the fuel supplying the engine, while protecting against mixing of fuels in the LPG tank, which will be explained in detail when describing an example of the system solution.

[0008] The system supplying the engines with fuel, alternately with petrol /diesel oil LPG, is shown in the drawing presenting its scheme.

[0009] As shown, in the supply system there is a petrol / diesel oil tank 1 and a LPG tank 2. A sealed glass 3 is placed in the LPG tank 2, which by its upper plate 4 is fixed in the upper plate 5 of the cup 6, placed in the LPG tank 2, At the inlet to the sealed glass 3 there is a solenoid valve 7, which controls the switching of fuel from petrol/diesel oil to LPG. To one input of the solenoid valve 7 there is supplied petrol / diesel oil through solenoid valve 13, and to the second input LPG is supplied - the electrovalve 7 opens the LPG flow instead of gasoline / diesel oil and vice versa. From the sealed glass 3 fuel: petrol / diesel or LPG is fed to the high pressure pump 8 and then to the engine 9. The low pressure branch at the outlet of the high pressure pump 8 is connected to the manifold 10 of the small and big fuel circuit. The small circuit valve 11 is connected to the sealed glass 3, whereas the large circuit valve 12 is connected to the LPG tank 2.

[0010] The operation of the system is as follows: when starting the supply system petrol / diesel is supplied to the inlet of the sealed glass 3, then the electrovalve 7 opens the petrol / diesel oil flow from the tank 1. From the sealed glass 3 petrol / diesel oil glass is supplied to the high pressure pump 8 and then to engine 9. In the manifold 10, the small circuit valve 11 is opened, petrol / diesel oil from the low pressure branch returns to the inside of the sealed glass 3 without mixing with LPG. When switching the system to LPG supply, the electrovalve 7 opens the LPG flow from the tank 2, petrol / diesel oil residues being in the small circuit flow into the sealed glass 3 and burn out in engine 9, in manifold 10 the small circuit valve 11 closes and the large circuit valve 12 opens and then LPG is fed to the supply system via the electrovalve 7. Returning to the petrol / diesel oil supply in the manifold 10 the big circuit valve 12 closes and the small circuit valve 11 opens, the electrovalve 7 closes the LPG supply and then petrol flows in a small circuit until the LPG is burned out in the system.

[0011] As you can see, the risk of mixing fuels in the LPG tank 2 is minimized and more precisely the dilution of LPG in LPG tank 2 by petrol or diesel oil.

[0012] In order to facilitate service work in the main plate 5 of cup 6, a non-return valve 14 is mounted in the LPG return pipe, which blocks the gas flow from the LPG tank 2, and a manual shut-off valve 15 is installed on the LPG supply line to the low pressure pump. In the manifold 10 of the big and small circuit a manual service valve 16 is installed.


Claims

1. The system supplying combustion engines with fuel, alternately with petrol / diesel oil or LPG, with a high pressure pump supplying fuel to the engine, a low pressure pump supplying selected fuel to the high pressure pump, with a fuel type switch placed ahead of the low pressure pump, with valves controlling the operation of the fuel change system from petrol /diesel oil to LPG, characterized in that in the LPG tank (2) in a sealed glass (3) isolated from the LPG tank (2) a low pressure pump (17) is placed, which at the input is equipped with elecrovalve (7) as a fuel change switch from petrol / diesel oil to LPG, wherein the low pressure branch at the outlet of the high pressure pump (8) feeding the engine (9) is connected to the manifold (10) of the small and big fuel circuit, in which the small circuit valve (11) is connected to the inlet of the low pressure pump (17) in a sealed glass (3) and the big circuit valve (12) is connected to the LPG tank (2), where the petrol / diesel oil is supplied to the inlet of the sealed glass (3) via the electrovalve (7).
 
2. A system according to claim 1, characterized in that the sealed glass (3) is placed in the LPG tank (2) via the cup (6), the sealed glass (3) being the upper plate (4) attached to the main plate (5) of the cup (6).
 
3. A system according to claim 1, characterized in that on the main plate (5) of the cup (6) on the LPG return line a non-return valve (14) is mounted to block gas outflow from the LPG tank and on the LPG supply line to the low pressure pump (17) a manual shut-off valve is installed (15).
 
4. A system according to claim 1, characterized in that in the manifold (10) of the small and big circuit a manual service valve (16) is mounted.
 




Drawing







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Search report




Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description