A high efficiency recirculation integrated gas mixing control method

Abstract

This invention discloses a high-efficiency recirculating integrated gas mixing control method, belonging to the field of engine technology. It solves the technical problem of reduced engine efficiency caused by traditional gas engine crankcase exhaust methods. The method involves: remixing crankcase exhaust gas, the mixture after turbocharging and intercooling, with natural gas and air, and then supplying it to the engine via a compressor and intercooler. The supply of crankcase exhaust gas and the turbocharged / intercooled mixture is controlled according to the engine's operating state to improve engine efficiency. The required gas quantity is calculated using the velocity density method based on the engine's operating speed and power, and the gas supply is controlled accordingly. The supply of the turbocharged / intercooled mixture is controlled by comparing the pressure difference across the engine's intake throttle valve with the calibrated theoretical pressure difference. Finally, the supply of crankcase exhaust gas is controlled by comparing the measured pressure within the crankcase with the calibrated theoretical pressure.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically, to a highly efficient recirculating integrated gas mixture control method. Background Technology

[0002] Traditional gas engine crankcase exhaust systems typically employ an open structure, where crankcase exhaust gases are directly vented into the atmosphere via a breather. However, this direct emission causes air pollution and reduces engine efficiency. Even closed-loop designs require independent configurations. Traditional compressors lack compressor recirculation, meaning they lack bypass valves, making it impossible to adapt the compressor to different environments. Even when a bypass valve recirculation structure is used, its design remains independent. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a highly efficient recirculating integrated gas mixing control method.

[0004] The technical solution of the present invention is: a high-efficiency recirculating integrated gas mixing control method, which remixes crankcase exhaust gas, turbocharged and intercooled mixed gas with gas and air, and supplies it to the engine through a compressor and intercooler, and controls the supply of crankcase exhaust gas and turbocharged and intercooled mixed gas according to the engine's operating state to improve engine efficiency.

[0005] As a further improvement, the required amount of gas is calculated using the velocity density method based on the engine's operating speed and power, and the gas supply is controlled according to the required amount of gas.

[0006] Furthermore, a gas control valve is installed. The ECU outputs a current or voltage signal to the gas control valve according to the required gas quantity, and controls the opening degree of the gas control valve to control the gas supply.

[0007] Furthermore, the supply of the air-fuel mixture after turbocharging and intercooling is controlled by comparing the pressure difference before and after the engine's intake throttle valve with the calibrated theoretical pressure difference.

[0008] Furthermore, a gas-fuel mixture control valve is installed. The ECU compares the pressure difference before and after the intake throttle valve with the calibrated theoretical pressure difference, and outputs a current or voltage signal to the gas-fuel mixture control valve to control the opening degree of the gas-fuel mixture control valve and thus control the supply of gas-fuel mixture.

[0009] Furthermore, the supply of exhaust gas to the crankcase is controlled by comparing the measured pressure value inside the crankcase with the calibrated theoretical pressure.

[0010] Furthermore, a crankcase exhaust gas control valve is installed. The ECU compares the pressure measurement value with the calibrated theoretical pressure and outputs a current or voltage signal to the crankcase exhaust gas control valve to control the opening degree of the crankcase exhaust gas control valve and thus control the supply of crankcase exhaust gas.

[0011] Furthermore, the crankcase exhaust gas, the mixed gas after turbocharging and intercooling, and the fuel gas and air are mixed again by the mixer.

[0012] Furthermore, the mixer is connected sequentially from the air inlet to the crankcase exhaust gas passage, the fuel gas passage, and the mixed gas passage.

[0013] Furthermore, the mixer is sequentially connected to the mixed gas passage, the crankcase exhaust gas passage, and the fuel gas passage from the air inlet.

[0014] Beneficial effects

[0015] Compared with the prior art, the advantages of this invention are as follows:

[0016] This invention calculates the required amount of fuel gas based on the engine's operating speed and power using the velocity density method, and controls the fuel gas supply accordingly. It also controls the supply of the turbocharged and intercooled mixture by comparing the pressure difference across the engine's intake throttle valve with the calibrated theoretical pressure difference. Furthermore, it controls the supply of crankcase exhaust gas by comparing the measured pressure in the crankcase with the calibrated theoretical pressure. Finally, the crankcase exhaust gas, the turbocharged and intercooled mixture, the fuel gas, and air are remixed in a Venturi mixer before being supplied to the engine via the compressor and intercooler. This process reduces exhaust emissions, improves engine efficiency, controls engine intake volume, enhances speed regulation and load control responsiveness, and adjusts turbocharger adaptability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] The components are: 1-engine, 2-ECU, 3-mixer, 4-turbocharger, 5-intercooler, 6-intake throttle valve, 7-intake pipe, 8-compressor, 9-intake manifold, 10-exhaust pipe, 11-turbine, 12-crankcase, 13-crankcase exhaust gas passage, 14-crankcase exhaust gas control valve, 15-mixed gas passage, 16-mixed gas control valve, 17-gas passage, 18-gas control valve, 19-first pressure sensor, 20-second pressure sensor, 21-third pressure sensor, 22-oil mist filter. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0020] See Figure 1 A high-efficiency recirculating integrated gas-fuel mixture control system includes an engine 1, an ECU 2, a mixer 3, a turbocharger 4, an intercooler 5, and an intake throttle valve 6. The mixer 3 is connected in sequence to the compressor 8 of the turbocharger 4, the intercooler 5, the intake throttle valve 6, and the intake manifold 9 of the engine 1 via an intake pipe 7. The engine 1 is connected to the turbine 11 of the turbocharger 4 via an exhaust pipe 10. The crankcase 12 of the engine 1 is connected to the mixer 3 via a crankcase exhaust gas passage 13. The crankcase exhaust gas passage 13 is equipped with a crankcase exhaust gas control valve 14. The intake pipe 7 between the intercooler 5 and the intake throttle valve 6 is equipped with a mixed gas passage 15 connecting to the mixer 3. The mixed gas passage 15 is equipped with a mixed gas control valve 16. The mixer 3 is connected to a gas passage 17, which is equipped with a gas control valve 18. The ECU 2 is electrically connected to the crankcase exhaust gas control valve 14, the mixed gas control valve 16, and the gas control valve 18.

[0021] Preferably, the mixer 3 is a Venturi mixer. The integrated Venturi mixer facilitates more uniform mixing of the gas and mixture, and the compact design reduces costs.

[0022] The crankcase exhaust gas passage 13, the combustion gas passage 17, and the mixed gas passage 15 are arranged outside the venturi mixer, and each passage is separated from the others.

[0023] Preferably, the mixer 3 is connected to the crankcase exhaust gas passage 13, the fuel gas passage 17, and the mixed gas passage 15 in sequence from the air inlet; or, the mixer 3 is connected to the mixed gas passage 15, the crankcase exhaust gas passage 13, and the fuel gas passage 17 in sequence from the air inlet, which can make the crankcase exhaust gas, the mixed gas after turbocharging and intercooling, and the fuel gas and air mix more evenly.

[0024] The intake pipe 7 at the input end of the intake throttle valve 6 is equipped with a first pressure sensor 19, and the intake pipe 7 at the output end of the intake throttle valve 6 is equipped with a second pressure sensor 20. The ECU2 is electrically connected to the first pressure sensor 19 and the second pressure sensor 20 to detect the pressure difference before and after the intake throttle valve 6.

[0025] A third pressure sensor 21 is installed inside the crankcase 12. The ECU2 is electrically connected to the third pressure sensor 21 to detect the pressure measurement value inside the crankcase 12.

[0026] The crankcase exhaust gas passage 13 is equipped with an oil mist filter 22 for filtering crankcase exhaust gas.

[0027] A highly efficient recirculating integrated gas mixing control method is proposed, which remixes crankcase exhaust gas, turbocharged and intercooled mixed gas with fuel gas and air, and then supplies the mixture to engine 1 through compressor 8 and intercooler 5. The supply of crankcase exhaust gas and turbocharged and intercooled mixed gas is controlled according to the operating state of engine 1 to improve engine efficiency.

[0028] Based on the operating speed and power of engine 1, the required amount of gas is calculated using the speed density method. The gas supply is then controlled based on the required amount of gas. If engine 1 drives a generator set, the required amount of gas can be calculated based on the generator set's speed and power.

[0029] Specifically, ECU2 obtains the operating speed and power of engine 1, calculates the required amount of gas using the speed density method, controls the gas supply based on the required amount of gas, and outputs a current or voltage signal to gas control valve 18 based on the required amount of gas, thereby controlling the opening degree of gas control valve 18 to control the gas supply.

[0030] The supply of the air-fuel mixture after turbocharging and intercooling is controlled by comparing the pressure difference before and after the intake throttle valve 6 of engine 1 with the calibrated theoretical pressure difference, so that the pressure difference before and after the intake throttle valve 6 is within the set range. The calibrated theoretical pressure difference can be in the form of a MAP table or a fitted curve.

[0031] Specifically, ECU2 detects the pressure difference before and after the intake throttle valve 6 through the first pressure sensor 19 and the second pressure sensor 20. Based on the comparison between the pressure difference before and after the intake throttle valve 6 and the calibrated theoretical pressure difference, it outputs a current or voltage signal to the air-fuel mixture control valve 16 to control the opening degree of the air-fuel mixture control valve 16 and thus control the supply of air-fuel mixture.

[0032] The supply of exhaust gas to the crankcase is controlled by comparing the measured pressure value inside the crankcase 12 with the calibrated theoretical pressure, so that the pressure inside the crankcase 12 is maintained within the set range. The calibrated theoretical pressure can be in the form of a MAP table or a fitted curve.

[0033] Specifically, ECU2 detects the pressure measurement value inside crankcase 12 through third pressure sensor 21. Based on the comparison between the pressure measurement value and the calibrated theoretical pressure, it outputs a current or voltage signal to crankcase exhaust gas control valve 14 to control the opening degree of crankcase exhaust gas control valve 14 and thus control the supply of crankcase exhaust gas.

[0034] This invention remixes crankcase exhaust gas, the mixed gas after turbocharging and intercooling, and fuel gas and air through a venturi mixer before supplying them to the engine via a compressor and intercooler. This reduces exhaust emissions, improves engine efficiency, controls engine intake volume, enhances speed regulation and load control responsiveness, and adjusts turbocharger adaptability.

[0035] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A highly efficient recirculating integrated gas mixing control method, characterized in that, By mixing the crankcase exhaust gas, the turbocharged and intercooled mixed gas with fuel gas and air again, and then supplying it to the engine (1) through the compressor (8) and intercooler (5), the supply of crankcase exhaust gas and turbocharged and intercooled mixed gas is controlled according to the working state of the engine (1) in order to improve engine efficiency. Based on the engine speed and power of the engine (1), the required amount of gas is calculated by the speed density method, and the gas supply is controlled according to the required amount of gas. Set up a gas control valve (18). The ECU (2) outputs a current or voltage signal to the gas control valve (18) according to the required gas quantity, and controls the opening of the gas control valve (18) to control the gas supply. The supply of the mixed gas after turbocharging and intercooling is controlled by comparing the pressure difference before and after the intake throttle valve (6) of the engine (1) with the calibrated theoretical pressure difference. Set up a gas-mixing control valve (16). The ECU (2) outputs a current or voltage signal to the gas-mixing control valve (16) based on the pressure difference before and after the intake throttle valve (6) and the calibrated theoretical pressure difference, thereby controlling the opening degree of the gas-mixing control valve (16) to control the supply of gas-mixing. The supply of exhaust gas to the crankcase is controlled by comparing the measured pressure value inside the crankcase (12) with the calibrated theoretical pressure. The crankcase exhaust gas control valve (14) is set up. The ECU (2) outputs a current or voltage signal to the crankcase exhaust gas control valve (14) based on the comparison between the pressure measurement value and the calibrated theoretical pressure, and controls the opening degree of the crankcase exhaust gas control valve (14) to control the supply of crankcase exhaust gas. The crankcase exhaust gas, the mixed gas after turbocharging and intercooling, and the fuel gas and air are mixed again by the mixer (3).

2. The efficient recirculating integrated gas mixing control method according to claim 1, characterized in that, The mixer (3) is connected in sequence from the air inlet to the crankcase exhaust gas passage (13), the gas passage (17), and the mixed gas passage (15).

3. The efficient recirculating integrated gas mixing control method according to claim 1, characterized in that, The mixer (3) is connected in sequence to the mixed gas passage (15), crankcase exhaust gas passage (13), and gas passage (17) from the air inlet.

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