An automatic oil supply system for an internal combustion engine and a control method thereof

Abstract

The present application relates to the technical field of fuel supply of internal combustion engine, and particularly discloses an automatic fuel supply system of internal combustion engine and a control method thereof, which comprises a main oil tank, a first auxiliary oil tank, a second auxiliary oil tank, an air compressor and a detection control module, and constitutes two independent oil paths, two independent air paths and a detection control part. The pressure and liquid level change of the auxiliary oil tank are monitored, the two auxiliary oil tanks are controlled to alternately supply oil, and after switching the oil path, the mixed gas formed by air and fuel vapor in the previous oil supply auxiliary oil tank is discharged into the engine intake duct and finally enters the cylinder for combustion. The present application can solve the problem of serious damage of new fuel to the pump and pressure regulating valve, the fuel supply system can continuously supply oil for a long time, fuel can be saved, environmental pollution can be reduced, and data monitoring of fuel consumption rate can be realized.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine fuel supply technology, and particularly to a fuel supply system requiring high flow rate and no backflow, specifically an automated fuel supply system for internal combustion engines and its control method. Background Technology

[0002] Many new fuels have different physicochemical properties from traditional fossil fuels. If we continue to use the traditional fuel supply system, there are many inconveniences. In the traditional fuel supply system, the oil pump and pressure regulating valve are not only expensive, but also cause great wear to the pump blades when a large flow of low-viscosity fuels such as methanol and dimethyl ether is required, making them extremely easy to damage.

[0003] Taking methanol as an example, it is liquid at room temperature and pressure, toxic and corrosive to metals. Using traditional pumps and pressure regulating valves to pressurize the methanol supply pipeline will cause the pumps and pressure regulating valves to be damaged quickly, and may even contaminate the methanol fuel itself. It is necessary to replace it with methanol-specific kits to make it work. If used on a large scale, the cost of use will increase significantly.

[0004] Patent document CN205371117U discloses a fuel supply device with dual pressurized fuel tanks, which uses compressed air as power and aims to reduce energy consumption. However, it uses two fuel tanks as interchangeable supply sources without a refueling device, limiting its use in terms of time and conditions. Furthermore, when using fuels with high saturated vapor pressure, much of the evaporated fuel mixes with air to form a mixture that is released into the atmosphere, causing environmental pollution and energy waste. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an automated fuel supply system and control method for internal combustion engines. This system solves the serious damage caused to pumps and pressure regulating valves by new fuels, allows for continuous fuel supply over extended periods, saves fuel, reduces environmental pollution, and enables monitoring of data such as fuel consumption rate. The technical solution is as follows:

[0006] An automated fuel supply system for an internal combustion engine comprises three parts: a main fuel tank, a first auxiliary fuel tank, a second auxiliary fuel tank, an air compressor, and a detection and control module.

[0007] Oil circuit section:

[0008] The first oil outlet of the main oil tank is connected to the oil inlet of the first auxiliary oil tank through a first electric valve, and the oil outlet of the first auxiliary oil tank is connected to the first oil inlet of the third three-way electric valve through a first check valve.

[0009] The second oil outlet of the main oil tank is connected to the oil inlet of the second auxiliary oil tank through a second electric valve, and the oil outlet of the second auxiliary oil tank is connected to the second oil inlet of the third three-way electric valve through a second one-way valve.

[0010] The oil outlet of the third three-way electric valve is connected to the oil rail, and an injector is provided on the oil rail;

[0011] Gas system components:

[0012] The air compressor's outlet is simultaneously connected to the inlet of the first three-way electric valve and the second three-way electric valve. The first outlet of the first three-way electric valve is connected to the inlet of the first auxiliary oil tank, and the first outlet of the second three-way electric valve is connected to the inlet of the second auxiliary oil tank. The second outlets of the first three-way electric valve and the second three-way electric valve are both connected to the engine intake manifold.

[0013] Detection and control section:

[0014] The first auxiliary oil tank is equipped with a first pressure sensor and a first liquid level sensor, and the second auxiliary oil tank is equipped with a second pressure sensor and a second liquid level sensor; the signal output lines of each sensor and each electric valve are connected to the detection and control module.

[0015] A control method for an automated fuel supply system for an internal combustion engine includes the following steps:

[0016] Step 1: After the user sets the oil supply pressure, the air compressor opens the air charging channel of the first three-way electric valve between the air compressor and the first auxiliary oil tank, so that the air compressor starts working to pressurize the air in the first auxiliary oil tank. When the first pressure sensor detects that the gas in the tank has reached the set pressure, the first oil inlet of the third three-way electric valve is opened, and the system starts to supply oil through the first auxiliary oil tank; and the air charging channel of the first three-way electric valve remains open when the first auxiliary oil tank is working.

[0017] Step 2: When the liquid level in the first auxiliary oil tank drops to the first warning level, open the air charging channel of the second three-way electric valve between the air compressor and the second auxiliary oil tank, so that the air compressor starts working to start charging the air in the second auxiliary oil tank;

[0018] Step 3: When the liquid level in the first auxiliary oil tank drops to the second warning level, close the first oil inlet of the third three-way electric valve and open the second oil inlet, so that the oil rail supply channel is connected to the second auxiliary oil tank; close the air charging channel of the first three-way electric valve connected to the air compressor and open the channel connected to the engine intake manifold of the first three-way electric valve, so that the high pressure gas in the first auxiliary oil tank begins to depressurize, and the mixture of air and fuel vapor is discharged into the engine intake manifold and finally enters the cylinder for combustion;

[0019] Step 4: When the first pressure sensor in the first auxiliary oil tank detects that the gas pressure has returned to normal, the depressurization process ends and the oil replenishment process begins. Open the first electric valve connecting the main oil tank and the first auxiliary oil tank to replenish oil. When the first liquid level sensor detects that the oil level has returned to the upper limit, the oil replenishment process ends, the first electric valve is closed, and one working cycle is completed.

[0020] Furthermore, when it is necessary to stop the oil supply system, the third three-way electric valve is directly closed, and then the auxiliary oil tank automatically starts the pressure relief process.

[0021] Furthermore, it also includes calculating the fuel consumption rate based on the initial upper limit liquid level data and the first warning liquid level data recorded by the detection and control module; as shown in the following formula:

[0022] Liquid level change = Upper limit liquid level data - First warning liquid level data

[0023] Fuel consumption rate = ;

[0024] Where t is the user-defined calculation time for single fuel consumption rate, and 3600 is the coefficient for converting the fuel consumption rate unit to kg / h.

[0025] The beneficial effects of this invention are:

[0026] 1) The automatic fuel supply system and control method for internal combustion engines of the present invention can solve the serious damage to pumps and pressure regulating valves caused by new fuels. Since the present invention uses air pressure to pressurize the fuel without direct contact with the fuel, there is no need to worry about the above problems. The fuel pressure can be flexibly adjusted by the electric valve to charge and release the gas. Users only need to input the set value into the system, and there is no need to manually adjust the pressure with tools like traditional pressure regulating valves.

[0027] 2) The fuel supply system of the present invention can supply fuel continuously for a long time, save fuel, reduce environmental pollution, and realize data monitoring such as fuel consumption rate. Attached Figure Description

[0028] Figure 1 This is a structural diagram of the automated fuel supply system for internal combustion engines of the present invention.

[0029] Figure 2 This is a schematic diagram of the liquid level in the auxiliary oil tank.

[0030] Figure 3(a) is a schematic diagram of the automatic control process and indicator lights of the automatic fuel supply system for internal combustion engines of the present invention.

[0031] Figure 3(b) is a schematic diagram of the calculation method of the detection and control module of the internal combustion engine automatic fuel supply system of the present invention.

[0032] In the diagram: 1-Main oil tank, 2-First electric valve, 3-Second electric valve, 4-First pressure sensor, 5-First liquid level sensor, 6-First three-way electric valve, 7-Air compressor, 8-Second three-way electric valve, 9-Second liquid level sensor, 10-Second pressure sensor, 11-First auxiliary oil tank, 12-Second auxiliary oil tank, 13-First check valve, 14-Second check valve, 15-Third three-way electric valve, 16-Fuel rail, 17-Injector, 18-Detection and control module. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] The structure of the automated fuel supply system for internal combustion engines of the present invention is as follows: Figure 1 As shown, it includes a large atmospheric pressure oil reservoir, two small high-pressure oil supply tanks, an electric valve, an air pressure source, two pressure sensors, two level sensors, a fuel rail, injectors (the same number as the cylinders), and a detection and control module. These components together form the oil circuit, air circuit, and detection and control sections of the fuel supply system.

[0035] Oil circuit section: The main oil tank 1 has two openings, which are connected to the first auxiliary oil tank 11 and the second auxiliary oil tank 12 via two first electric valves 2 and a second electric valve 3, respectively. The first auxiliary oil tank 11 and the second auxiliary oil tank 12 are connected to the third three-way electric valve 15 via two first one-way valves 13 and a second one-way valve 14, respectively. The outlet end of the third three-way electric valve 15 is connected to the oil rail, and the injector 17 is installed on the oil rail 16. The oil flow path is consistent with the above oil circuit connection sequence. The function of the first electric valve and the second electric valve 3 is to control the oil replenishment time; the function of the third three-way electric valve 15 is to switch the oil circuit and control the oil circuit connection path.

[0036] Air circuit section: The outlet end of the air compressor 7 is connected to the first auxiliary oil tank 11 and the second auxiliary oil tank 12 via the first three-way electric valve 6 and the second three-way electric valve 8, respectively. The other ends of the first three-way electric valve 6 and the second three-way electric valve 8 are both connected to the engine's intake manifold. The function of the air compressor is to pressurize the air in the first auxiliary oil tank 11 and the second auxiliary oil tank 12 to provide the required oil supply pressure; the function of the first three-way electric valve 6 and the second three-way electric valve 8 is to control the pressurization and depressurization process.

[0037] The detection and control section includes: a first auxiliary oil tank 11 equipped with a first pressure sensor 4 and a first liquid level sensor 5; a second auxiliary oil tank 12 equipped with a second pressure sensor 10 and a second liquid level sensor 9; and red, green, and yellow indicator lights. The signal output lines of the pressure and liquid level sensors, as well as the control lines of the indicator lights, are all connected to the detection and control module. The sensors are used to detect the system status; the indicator lights are used to indicate the system's operating status.

[0038] The automatic control process and indicator light diagram of this invention are shown in Figure 3(a), and the calculation method of the detection control module is shown in Figure 3(b). The automatic control method is as follows:

[0039] When the system is not started, the red indicator lights of the first auxiliary oil tank 11 and the second auxiliary oil tank 12 are constantly on. When the start button is clicked on the detection control module, the red indicator light turns off and the yellow indicator light turns on. The sensor will start detecting, and the current gas pressure and oil volume in the first auxiliary oil tank 11 and the second auxiliary oil tank 12 will be displayed on the detection control module. At this time, the user can set the required oil supply pressure. After the oil supply pressure is set, the air passage of the first three-way electric valve 6 between the air compressor 7 and the first auxiliary oil tank 11 will be opened, and the air compressor will start working to pressurize the air in the first auxiliary oil tank 11. When the first pressure sensor 4 detects that the gas in the tank has reached the set pressure, the system will prompt that oil supply can start. After the user selects to start oil supply, the yellow indicator light will turn off and the green indicator light will turn on. At this time, the oil supply passage of the third three-way electric valve 15 connecting the oil outlet end of the first auxiliary oil tank 11 and the oil rail will be opened, and the system will start supplying oil.

[0040] When the oil supply system is running normally, the green indicator light is always on, and the screen will display the oil supply pressure, oil level, oil volume, and oil consumption per unit time in real time. As the oil supply system continues to work, the oil level drops, and the air compressor needs to work continuously to maintain the stability of the gas pressure in the tank. Therefore, the air charging channel of the first three-way electric valve 6 needs to be kept open when the first auxiliary oil tank 11 is working.

[0041] When the liquid level in the first auxiliary oil tank 11 drops to Figure 2 When the oil level reaches level 2 (first warning level), it indicates that the oil volume is not high. At this time, the green light on the first auxiliary oil tank 11 remains constantly lit, while the yellow light begins to flash. If continued oil supply is required, the system will automatically open the electric valve between the air compressor and the second auxiliary oil tank 12 to pressurize the air in the second auxiliary oil tank 12. At this time, the yellow indicator light on the second auxiliary oil tank 12 remains constantly lit. When the pressurization is complete and oil supply is ready to begin, the yellow indicator light goes out, and the green indicator light flashes.

[0042] When the oil level in the first auxiliary oil tank 11 drops to level 3 (the second warning level), the oil rail supply channel of the third three-way electric valve 15 is switched to connect with the second auxiliary oil tank 12. At this time, the oil supply line of the first auxiliary oil tank 11 is cut off, and the second auxiliary oil tank 12 begins to supply oil to the system. The green indicator light changes from flashing to solid. The yellow and green lights on the first auxiliary oil tank 11 go out, the red indicator light flashes, the channel of the first three-way electric valve 6 connected to the air compressor of the first auxiliary oil tank 11 is closed, and the channel connected to the engine intake manifold is opened. The high-pressure gas in the first auxiliary oil tank 11 begins to depressurize, and the mixture of air and fuel vapor is discharged into the engine intake manifold and finally enters the cylinder for combustion. This not only saves fuel but also reduces environmental pollution.

[0043] When the first pressure sensor 4 in the first auxiliary oil tank 11 detects that the gas pressure has returned to normal, the depressurization process ends. At this time, the red indicator light on the first auxiliary oil tank 11 remains constantly lit and the yellow indicator light flashes, and the oil replenishment process begins. The first electric valve connecting the main oil tank and the first auxiliary oil tank 11 is opened to replenish the oil. When the level sensor detects that the oil level has returned to level 1 (upper limit level), the oil replenishment process ends, the system closes the first electric valve, and the yellow indicator light goes out. This completes one working cycle of the system.

[0044] When it is necessary to stop the oil supply system, simply click the stop button on the detection and control module to close the third three-way electric valve 15, and then the auxiliary oil tank will automatically start the pressure relief process.

[0045] The fuel consumption rate is calculated by first detecting and controlling the module to record an initial liquid level data 1, and then recording another liquid level data 2 after t seconds. The change in liquid level height is calculated as: liquid level data 1 - liquid level data 2.

[0046] Fuel consumption rate (kg / h) = ;

[0047] Where t is the user-defined calculation time for single fuel consumption rate, and 3600 is the coefficient for converting the fuel consumption rate unit to kg / h.

[0048] In summary, this invention can solve the problem of severe damage to pumps and pressure regulating valves caused by new fuels, and the fuel supply system can continuously supply fuel for a long time, while saving fuel, reducing environmental pollution, and enabling data monitoring such as fuel consumption rate.

Claims

1. An automated fuel supply system for an internal combustion engine, characterized in that, It includes a main oil tank (1), a first auxiliary oil tank (11), a second auxiliary oil tank (12), an air compressor (7), and a detection and control module (18). Oil circuit section: The first oil outlet of the main oil tank (1) is connected to the oil inlet of the first auxiliary oil tank (11) through the first electric valve (2), and the oil outlet of the first auxiliary oil tank (11) is connected to the first oil inlet of the third three-way electric valve (15) through the first check valve (13). The second oil outlet of the main oil tank (1) is connected to the oil inlet of the second auxiliary oil tank (12) through the second electric valve (3), and the oil outlet of the second auxiliary oil tank (12) is connected to the second oil inlet of the third three-way electric valve (15) through the second one-way valve (14). The oil outlet of the third three-way electric valve (15) is connected to the oil rail (16), and an injector (17) is provided on the oil rail (16). Gas system components: The air outlet of the air compressor (7) is simultaneously connected to the air inlet of the first three-way electric valve (6) and the second three-way electric valve (8). The first air outlet of the first three-way electric valve (6) is connected to the air inlet of the first auxiliary oil tank (11). The first air outlet of the second three-way electric valve (8) is connected to the air inlet of the second auxiliary oil tank (12). The second air outlets of the first three-way electric valve (6) and the second three-way electric valve (8) are connected to the engine intake manifold. Detection and control section: The first auxiliary oil tank (11) is equipped with a first pressure sensor (4) and a first liquid level sensor (5), and the second auxiliary oil tank (12) is equipped with a second pressure sensor (10) and a second liquid level sensor (9); the signal output lines of each sensor and each electric valve are connected to the detection and control module (18).

2. A control method for an automated fuel supply system for an internal combustion engine as described in claim 1, characterized in that, Includes the following steps: Step 1: After the user sets the oil supply pressure, the air compressor (7) opens the air charging channel of the first three-way electric valve (6) between the air compressor (7) and the first auxiliary oil tank (11), so that the air compressor (7) starts to work to pressurize the air in the first auxiliary oil tank (11). When the first pressure sensor (4) detects that the gas in the tank has reached the set pressure, the first oil inlet of the third three-way electric valve (15) is opened, and the system starts to supply oil through the first auxiliary oil tank (11); and the air charging channel of the first three-way electric valve (6) remains open when the first auxiliary oil tank (11) is working. Step 2: When the liquid level in the first auxiliary oil tank (11) drops to the first warning level, open the air charging channel of the second three-way electric valve (8) between the air compressor (7) and the second auxiliary oil tank (12) so that the air compressor (7) starts working to start charging the air in the second auxiliary oil tank (12); Step 3: When the liquid level in the first auxiliary oil tank (11) drops to the second warning level, close the first oil inlet of the third three-way electric valve (15) and open the second oil inlet, so that the oil rail (16) supply channel is connected to the second auxiliary oil tank (12); close the charging channel of the first three-way electric valve (6) connected to the air compressor (7) of the first auxiliary oil tank (11), and open the channel connected to the engine intake manifold of the first three-way electric valve (6), so that the high pressure gas in the first auxiliary oil tank (11) begins to depressurize, and discharge the mixture of air and fuel vapor into the engine intake manifold and finally enter the cylinder for combustion; Step 4: When the first pressure sensor (4) in the first auxiliary oil tank (11) detects that the gas pressure has returned to normal, the depressurization process ends and the oil replenishment process begins. The first electric valve (2) connecting the main oil tank (1) and the first auxiliary oil tank (11) is opened to replenish the oil. When the first liquid level sensor (5) detects that the oil level has returned to the upper limit, the oil replenishment process ends and the first electric valve (2) is closed to complete one working cycle.

3. The control method according to claim 2, characterized in that, When it is necessary to stop the oil supply system, directly close the third three-way electric valve (15), and then the auxiliary oil tank will automatically start the depressurization process.

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