Fuel supply system device for gasoline octane number tester suitable for plateau environment

Abstract

A fuel supply system device for a gasoline octane number measuring machine suitable for plateau environments includes a high-pressure gas cylinder, a fuel tank, a first pressure gauge, a second pressure gauge, a fuel injector, an intake pipe, a gasoline octane number measuring machine combustion chamber, a gas control switch, and an oil rail; the first pressure gauge is arranged between the high-pressure gas cylinder and the gas control switch, and when the gas control switch is turned on, the high-pressure gas cylinder inputs high-pressure gas into a fuel tank storing fuel through a high-pressure oil pipe; the second pressure gauge is located between the fuel tank and the oil rail; the fuel tank is connected to the second pressure gauge, the oil rail and the fuel injector in sequence by a fuel pipe, and when the values ​​displayed by the second pressure gauge and the first pressure gauge meet a first linear relationship, the fuel tank delivers fuel to the fuel injector, and the fuel injector injects fuel into the intake pipe. The device is simple to set up, easy to install and disassemble, and low in cost. The octane number of the fuel can be accurately measured under different atmospheric pressure environments.

Description

Technical Field

[0001] The invention relates to the technical field of a fuel supply system device for a gasoline octane number measuring machine, and in particular to a fuel supply system device for a gasoline octane number measuring machine suitable for a plateau environment. Background Art

[0002] The gasoline octane number tester is used to test the octane number of fuel. In traditional gasoline engines and other spark-ignition engines, the octane number is an important indicator for evaluating the anti-knock performance of fuel. The traditional gasoline octane number tester uses a carburetor fuel supply system for fuel supply. The atmospheric pressure in the environment will affect the fuel supply function of the system. If the gasoline octane number tester tests the fuel octane number under an atmospheric pressure environment, that is, in an area with an altitude of less than about 1,500 meters, the fuel octane number can be tested normally. However, if it is in a plateau environment (an area with an altitude of more than about 1,500 meters), that is, under an atmospheric pressure environment, the carburetor fuel supply system of the traditional gasoline octane number tester will cause insufficient fuel supply and too low fuel atomization quality due to low atmospheric pressure, and the gasoline octane number tester cannot accurately measure the octane number of the fuel. In addition, the carburetor fuel supply system used by the gasoline octane number tester is different from the current gasoline engine fuel supply system, and the fuel octane number result obtained may not represent the actual condition of the fuel in the gasoline engine. Therefore, it is necessary to convert the carburetor fuel supply system into an electronically controlled fuel injection supply system, so that the gasoline octane number tester can normally carry out the fuel octane number test under different atmospheric pressure environments. However, if a small fuel pump is used to provide the fuel supply pressure in the fuel supply system, it is easy to cause the fuel supply pressure to be insufficient and unstable in the oil circuit during the long test process. This will affect the atomization quality of the fuel in the intake duct, making it impossible to accurately measure the octane number of the fuel. In addition, this small fuel pump will also generate a certain amount of heat when working, resulting in different fuel temperatures in different oil circuits in the system, which will also affect the measurement error of the octane number. If the fuel pump is frequently replaced or a cooling circulation device is used to cool the fuel temperature of each circuit, it will bring difficulties in installation and disassembly and cause certain cost problems.

[0003] In summary, there is no appropriate solution for accurately measuring the octane number of fuel in plateau areas. Therefore, in view of the above-mentioned technical difficulties, how to innovatively design the fuel supply system device of the gasoline octane number measuring machine so that the gasoline octane number measuring machine can accurately measure the octane number of fuel under different atmospheric pressure environments is a technical problem that needs to be solved in this field. Summary of the invention

[0004] In order to solve the above-mentioned technical difficulties, the present invention provides a fuel supply system device for a gasoline octane number measuring machine with a stable fuel supply pressure under different atmospheric pressure environments, so that the gasoline octane number measuring machine has a stable fuel supply pressure during long-term operation, ensuring that the fuel system has a stable fuel supply and a high injection pressure, and maintaining the temperature of the test fuel in the oil circuit at the same level, so that the gasoline octane number measuring machine can accurately measure the octane number of the fuel under different atmospheric pressure environments.

[0005] According to a first aspect of the present invention, there is provided a fuel supply system device for a gasoline octane number tester suitable for use in a plateau environment, the device comprising a high-pressure gas cylinder, a fuel tank, a first pressure gauge, a second pressure gauge, a fuel injector, an intake pipe, a combustion chamber of the gasoline octane number tester, a gas control switch, and an oil rail; the first pressure gauge is disposed between the high-pressure gas cylinder and the gas control switch, and when the gas control switch is turned on, the high-pressure gas cylinder inputs high-pressure gas into a fuel tank storing fuel through a high-pressure oil pipe; the second pressure gauge is located between the fuel tank and the oil rail; the fuel tank is connected in sequence to the second pressure gauge, the oil rail, and the fuel injector by a fuel pipe, and when the values ​​displayed by the second pressure gauge and the first pressure gauge satisfy a first linear relationship, the fuel tank delivers fuel to the fuel injector, the fuel injector injects fuel into the intake pipe, and the fuel and air are mixed in the intake pipe and enter the combustion chamber of the gasoline octane number tester; the plateau environment refers to an area with an altitude of more than 1,500 meters.

[0006] Further, the first linear relationship is P1=KP2, wherein P1 is the pressure value of the gas circuit between the high-pressure gas cylinder and the gas control switch monitored by the first pressure gauge, P2 is the pressure value of the fuel oil circuit between the fuel tank and the fuel rail monitored by the second pressure gauge, and K is the pressure fluctuation coefficient; when the value monitored in the second pressure gauge does not reach the required value, the pressure value of the first pressure gauge is adjusted so that the pressure value of the first pressure gauge and the pressure value of the second pressure gauge conform to the first linear relationship.

[0007] Furthermore, the pressure fluctuation coefficient is determined by obtaining a volume parameter A1 of the fuel tank, a diameter parameter A2 of the fuel pipe, and a length A3 of the fuel pipe between the top surface of the fuel tank and the top of the second pressure gauge, K=A1*A2*A3.

[0008] Furthermore, the fuel supply system device has multiple oil circuits, each of which includes a gas control switch, a fuel tank, and a second pressure gauge; the oil circuits are adjusted according to the indicators of the fuel to be measured, and only one oil circuit is opened at a time.

[0009] Furthermore, the oil supply pressure of the high-pressure gas cylinder is above 10 atmospheres, and the fuel pressure in the oil circuit is maintained at 4-5 atmospheres.

[0010] Furthermore, the fuel temperature difference in each oil circuit of the fuel supply system device is less than a preset threshold.

[0011] Beneficial effects:

[0012] (1) Compared with the existing technology, the advantages of the present invention are: the high-pressure gas cylinder transports high-pressure gas to the high-pressure resistant fuel tank, so that the fuel flows in the oil circuit and can ensure that there is a certain fuel supply pressure in the fuel system, thereby ensuring that the fuel flows to the fuel injector.

[0013] (2) The high-pressure gas cylinder of the present invention can provide a stable fuel supply pressure, which can stabilize the fuel pressure in the fuel system, thereby ensuring that the fuel injection amount can be stably supplied under different atmospheric pressure environments, ensuring a stable fuel injection pressure, so that the fuel can be fully atomized in the intake pipe. The use of electronic control unit software can ensure that the fuel reaches the maximum intensity when detonation occurs in the engine combustion chamber.

[0014] (3) In the device of the present invention, the temperature of the fuel is almost the same, which reduces the error of the fuel octane number test result. Compared with the existing fuel supply system, the system is not affected by the atmospheric pressure factor in the environment and has a stable fuel supply pressure for a long time.

[0015] (4) The fuel supply system of the present invention is simple to set up and easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the fuel supply system device with stable fuel supply pressure.

[0017] Among them are 1. high-pressure gas cylinder, 2. fuel tank, 3. second pressure gauge, 4. fuel injector, 5. intake pipe, 6. gasoline octane number measuring machine combustion chamber, 7. gas control switch, 8. fuel rail, 9. oil line transport control switch, and 10. first pressure gauge. DETAILED DESCRIPTION

[0018] The accompanying drawings show a fuel supply system device of a gasoline octane number measuring machine suitable for plateau environments according to the present invention.

[0019] The fuel supply system device of the gasoline octane number measuring machine with stable fuel supply pressure suitable for plateau environment comprises a high-pressure gas cylinder 1, a fuel tank 2, a first pressure gauge 10, a second pressure gauge 3, a fuel injector 4, an intake pipe 5, a gasoline octane number measuring machine combustion chamber 6, a gas control switch 7, and an oil rail 8; the first pressure gauge 10 is arranged between the high-pressure gas cylinder 1 and the gas control switch 7, and when the gas control switch 7 is turned on, the high-pressure gas cylinder 1 inputs high-pressure gas into the fuel tank 2 storing fuel through a high-pressure oil pipe; the second pressure gauge 3 is located between the fuel tank 2 and the oil rail; the fuel tank 2 is connected to the second pressure gauge 3, the oil rail 8 and the fuel injector 4 in sequence by a fuel pipe, and when the values ​​displayed by the second pressure gauge 3 and the first pressure gauge 10 meet a first linear relationship, the fuel tank 2 delivers fuel to the fuel injector 4, the fuel injector 4 injects fuel into the intake pipe 5, and the fuel and air are mixed in the intake pipe 5 and enter the gasoline octane number measuring machine combustion chamber 6; the plateau environment refers to an area with an altitude higher than 1500 meters.

[0020] The high-pressure gas cylinder 1 inputs high-pressure gas into the high-pressure resistant fuel tank 2 storing fuel through a high-pressure oil pipe, so that the fuel flows in the oil circuit, and the gas control switch is used to control the gas delivery, and the oil circuit delivery control switch is used to control each oil circuit to enter the fuel injector. A second pressure gauge 3 is installed in the oil circuit; the high-pressure resistant fuel tank 2 is connected to the second pressure gauge 3, the fuel rail 8 and the fuel injector 4 in sequence through a fuel pipe. The fuel is delivered to the fuel injector 4, and the fuel injector 4 injects the fuel into the intake pipe.

[0021] Each oil circuit has an independent switch to control the delivery of fuel. The high-pressure gas cylinder 1 can provide a stable fuel supply pressure in the fuel system, which can reach a maximum of 10 atmospheric pressures, which is much higher than the required fuel supply pressure (4-5 atmospheric pressures) in the fuel system.

[0022] By installing the second pressure gauge 3, it is possible to check at any time whether the oil pressure in the oil circuit has reached the required pressure value.

[0023] The fuel injection amount of the fuel injector 4 is controlled by an electronic control unit, and the fuel injection amount when the engine reaches the maximum knock can be accurately found. The fuel injector 4 is installed on the intake pipe not far from the engine intake valve. The intake pipeline of the engine is connected to the set fuel system. The fuel injected from the fuel injector 4 is fully atomized in the intake pipe of the gasoline octane number tester and fully mixed with the air before entering the combustion chamber of the engine.

[0024] In the process of determining the octane number of the fuel, toluene reference fuel, high standard sample fuel, low standard sample fuel and the fuel to be tested are respectively stored in the high pressure resistant fuel tank. The fuel injector 4 is controlled by an electronic control unit. During the warm-up process of the engine, the gas control switch of the oil circuit equipped with the high standard sample or the low standard sample and the oil circuit delivery control switch are turned on to make the fuel in the oil circuit flow and have a stable fuel supply pressure, and the electronic control unit is used to control the injection timing and injection amount of the fuel injector. When the various operating parameters of the gasoline octane number measuring machine meet the octane number test conditions, the octane number of the fuel is tested according to the corresponding steps.

[0025] In this embodiment, the first linear relationship is P1=KP2, wherein P1 is the pressure value of the gas circuit between the high-pressure gas cylinder 1 and the gas control switch 7 monitored by the first pressure gauge 10, P2 is the pressure value of the fuel oil circuit between the fuel tank 2 and the fuel rail monitored by the second pressure gauge 3, and K is the pressure fluctuation coefficient; when the value monitored by the second pressure gauge 3 does not reach the required value, the pressure value of the first pressure gauge 10 is adjusted so that the pressure value of the first pressure gauge 10 and the pressure value of the second pressure gauge 3 meet the first linear relationship.

[0026] In this embodiment, the pressure fluctuation coefficient is determined by obtaining a volume parameter A1 of the fuel tank 2, a diameter parameter A2 of the fuel pipe, and a length A3 of the fuel pipe between the top surface of the fuel tank 2 and the top of the second pressure gauge 3, wherein K=A1*A2*A3.

[0027] In this embodiment, the fuel supply system device has multiple oil circuits, each of which includes a gas control switch 7, a fuel tank 2, and a second pressure gauge 3; the oil circuits are adjusted according to the indicators of the fuel to be measured, and only one oil circuit is opened at a time.

[0028] In this embodiment, the oil supply pressure of the high-pressure gas cylinder 1 is above 10 atmospheres, and the fuel pressure in the oil circuit is maintained at 4-5 atmospheres.

[0029] In this embodiment, the difference in fuel temperature in each oil circuit of the fuel supply system device is less than a preset threshold.

[0030] Another embodiment of the fuel supply system device of the gasoline octane number measuring machine suitable for plateau environment of the present invention comprises four high-pressure resistant fuel tanks (capable of withstanding a pressure of 10 atmospheres) of the same volume, a high-pressure gas cylinder, a pressure gauge, a fuel injector, an air intake pipe, an electronic controller unit, a pressure valve switch, a pressure relief valve switch, a gas control switch, an oil rail, and an oil circuit control switch. The high-pressure gas cylinder is connected to the high-pressure resistant fuel tank through a high-pressure pipe, the gas control switch is used to control the delivery of gas, and the oil circuit delivery control switch is used to control the oil in the fuel tank to enter the fuel injector. The high-pressure resistant fuel tank is connected to each second pressure gauge by using a fuel pipe. A pressure gauge, a pressure regulating valve and a pressure relief valve are arranged in the fuel tank. The second pressure gauge is connected to the fuel rail and the fuel injector in sequence through an oil pipe. The second pressure gauge is installed in the oil circuit to facilitate the monitoring of whether the pressure in the oil circuit system reaches the set pressure value at all times and to monitor whether the fuel system can work normally for a long time.

[0031] The position of the fuel injector is selected on the intake pipe not far from the intake valve. The fuel injector has a large injection pressure, which can fully atomize the fuel in the pipe and fully mix it with the air. The injection pressure is almost the same as the injection pressure of the actual engine, which can fully represent the combustion condition of the fuel in the actual gasoline engine. By using the electronically controlled fuel injector, the mixing ratio of fuel and air can be accurately found when the knock intensity generated by the engine reaches the maximum value.

[0032] The purpose of installing a pressure gauge in the high-pressure resistant fuel tank is to monitor the pressure in the fuel tank at all times, and the purpose of installing a pressure relief valve switch is to prevent the pressure from being higher than a set value, thereby avoiding damage to the fuel tank and injury to the tester.

[0033] In summary, the present invention proposes a fuel supply system device for a gasoline octane number measuring machine with a stable fuel supply pressure under different atmospheric pressure environments, which ensures that the fuel system has a stable fuel supply pressure when the gasoline octane number measuring machine works for a long time, thereby avoiding the fuel supply of the gasoline octane number measuring machine from being affected by the atmospheric pressure in the environment, and also ensures that the fuel temperature in the fuel system is almost the same, ensuring that the octane number of the fuel can be accurately measured.

[0034] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions obtained by technicians in this technical field through logical analysis and reasoning based on the concept of the present invention on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A fuel supply system device for a gasoline octane number measuring machine suitable for plateau environments, characterized in that: The invention comprises a high-pressure gas cylinder (1), a fuel tank (2), a first pressure gauge (10), a second pressure gauge (3), a fuel injection nozzle (4), an air intake pipe (5), a gasoline octane number measuring machine combustion chamber (6), a gas control switch (7), and a fuel rail (8); the first pressure gauge (10) is arranged between the high-pressure gas cylinder (1) and the gas control switch (7); when the gas control switch (7) is turned on, the high-pressure gas cylinder (1) inputs high-pressure gas into the fuel tank (2) containing fuel through a high-pressure oil pipe; the second pressure gauge (3) is located in the fuel tank (2) and the fuel rail; the fuel tank (2) is connected to the second pressure gauge (3), the fuel rail (8) and the fuel injector (4) in sequence by a fuel pipe; when the values ​​displayed by the second pressure gauge (3) and the first pressure gauge (10) satisfy a first linear relationship, the fuel tank (2) delivers the fuel to the fuel injector (4), the fuel injector (4) injects the fuel into the intake pipe (5), and the fuel and air are mixed in the intake pipe (5) and enter the combustion chamber (6) of the gasoline octane number measuring machine; the plateau environment refers to an area with an altitude of more than 1,500 meters; The first linear relationship is P1=KP2, wherein P1 is the pressure value of the gas circuit between the high-pressure gas cylinder (1) and the gas control switch (7) monitored by the first pressure gauge (10), P2 is the pressure value of the fuel oil circuit between the fuel tank (2) and the fuel rail monitored by the second pressure gauge (3), and K is the pressure fluctuation coefficient; when the value monitored by the second pressure gauge (3) does not reach the required value, the pressure value of the first pressure gauge (10) is adjusted so that the pressure value of the first pressure gauge (10) and the pressure value of the second pressure gauge (3) meet the first linear relationship; The fuel supply system device has a plurality of oil circuits, and the difference in fuel temperature in each oil circuit of the fuel supply system device is less than a preset threshold value; Each oil circuit includes a gas control switch (7), a fuel tank (2), and a second pressure gauge (3); the oil circuit is adjusted according to the index of the fuel to be measured, and only one oil circuit is opened at a time; The oil supply pressure of the high-pressure gas cylinder (1) is above 10 atmospheres; The fuel pressure in the oil circuit is maintained at 4 atmospheres; In the process of measuring the octane number of fuel, a toluene reference fuel, a high standard sample fuel, a low standard sample fuel and a fuel to be tested are respectively stored in a high pressure resistant fuel tank; an electronic control unit is used to control the fuel injection nozzle (4); During the engine warm-up process, turn on the gas control switch of the oil circuit equipped with the high-standard sample or low-standard sample and the oil circuit delivery control switch to keep the fuel in the oil circuit flowing with a stable fuel supply pressure. Use the electronic control unit to control the injection timing and amount of the injector. When the various operating parameters of the gasoline octane number tester meet the octane number test conditions, test the octane number of the fuel according to the corresponding steps.

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