CN-116696619-B - Efficient recycling type integrated gas mixing control method

CN116696619BCN 116696619 BCN116696619 BCN 116696619BCN-116696619-B

Abstract

The invention discloses a high-efficiency recirculation type integrated gas mixing control method, which belongs to the technical field of engines and solves the technical problem of reduced gas engine efficiency in the exhaust mode of a traditional gas engine crankcase, and the method comprises the steps of mixing crankcase waste gas, mixed gas after supercharging and intercooling with gas and air again, supplying the mixed gas to an engine through a gas compressor and an intercooler, and controlling the supply quantity of the crankcase waste gas and the mixed gas after supercharging and intercooling according to the working state of the engine so as to improve the engine efficiency; the method comprises the steps of calculating the required gas quantity according to the running speed and power of an engine through a speed density method, controlling the supply quantity of the gas according to the required gas quantity, controlling the supply quantity of the mixed gas after supercharging and intercooling according to the comparison of the pressure difference of an air inlet throttle of the engine and a calibrated theoretical pressure difference, and controlling the supply quantity of crankcase waste gas according to the comparison of a pressure measured value in a crankcase and the calibrated theoretical pressure.

Inventors

SU ZHANWANG
TANG LAN
Miao longsen
HUANG YONGZHONG
ZENG ZHILONG
WU ZENGGANG
MO YUAN
WANG JIAXIANG
JIN WEI
LAI ZHUBO
CAI XIAOXIA

Assignees

广西玉柴船电动力有限公司

Dates

Publication Date: 20260505
Application Date: 20230707

Claims (3)

1. The high-efficiency recirculation type integrated gas mixing control method is characterized in that after the mixed gas after crankcase waste gas and supercharging and intercooling is mixed with gas and air again, the mixed gas is supplied to an engine (1) through a gas compressor (8) and an intercooler (5), and the supply quantity of the mixed gas after crankcase waste gas and supercharging and intercooling is controlled according to the working state of the engine (1), so that the engine efficiency is improved; According to the rotating speed and power of the engine (1), calculating the required gas quantity by a speed density method, and controlling the supply quantity of the gas according to the required gas quantity; setting a gas control valve (18), and outputting a current or voltage signal to the gas control valve (18) by the ECU (2) according to the required gas quantity, and controlling the opening degree of the gas control valve (18) to control the gas supply quantity; according to the comparison between the pressure difference of the front and the rear of an air inlet throttle valve (6) of the engine (1) and the calibrated theoretical pressure difference, the supply quantity of the mixed gas after supercharging and intercooling is controlled; Setting a mixed gas control valve (16), and comparing the pressure difference before and after the air inlet throttle valve (6) with a calibrated theoretical pressure difference by the ECU (2), outputting a current or voltage signal to the mixed gas control valve (16), and controlling the opening degree of the mixed gas control valve (16) to control the supply quantity of the mixed gas; Controlling the supply of crankcase exhaust gas based on a comparison of the pressure measurement in the crankcase (12) with a calibrated theoretical pressure; Setting a crankcase waste gas control valve (14), and comparing the pressure measured value with a calibrated theoretical pressure by the ECU (2), outputting a current or voltage signal to the crankcase waste gas control valve (14), and controlling the opening degree of the crankcase waste gas control valve (14) to control the supply amount of crankcase waste gas; And mixing the crankcase waste gas, the mixed gas after supercharging and intercooling with fuel gas and air again through a mixer (3).
2. An efficient recirculation type integrated gas mixing control method according to claim 1, characterized in that the mixer (3) is connected to the crankcase off-gas channel (13), the gas channel (17), the mixed gas channel (15) in order from the air inlet.
3. An efficient recirculation type integrated gas mixing control method according to claim 1, characterized in that the mixer (3) is connected to the mixed gas channel (15), the crankcase off-gas channel (13) and the gas channel (17) in this order from the air inlet.

Description

Efficient recycling type integrated gas mixing control method Technical Field The invention relates to the technical field of engines, in particular to a high-efficiency recycling type integrated gas mixing control method. Background The traditional crankcase exhaust mode of the gas engine generally adopts an open structure, namely, the exhaust gas of the crankcase is directly exhausted to the atmosphere through a respirator, but the direct exhaust can cause the atmosphere to pollute the environment, and the efficiency of the gas engine is reduced, and even if the crankcase exhaust mode adopts a closed structure, the crankcase exhaust mode is designed independently. The traditional compressor is not designed for compressor recirculation, namely, the bypass valve is not designed, the adaptive adjustment and matching of the supercharger under different environments cannot be realized, and the design is independent even if a bypass valve recirculation structure is adopted. Disclosure of Invention The invention aims to solve the technical problems of the prior art and aims to provide a high-efficiency recycling type integrated gas mixing control method. According to the technical scheme, the high-efficiency recycling type integrated gas mixing control method comprises the steps of mixing the mixed gas obtained by supercharging and intercooling the crankcase waste gas with the gas and air again, supplying the mixed gas to an engine through a gas compressor and an intercooler, and controlling the supply quantity of the mixed gas obtained by supercharging and intercooling the crankcase waste gas according to the working state of the engine so as to improve the efficiency of the engine. As a further improvement, the required gas amount is calculated by a speed density method according to the rotation speed and power of the engine operation, and the supply amount of the gas is controlled according to the required gas amount. Further, a gas control valve is arranged, and 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 quantity. Further, the supply amount of the mixed gas after supercharging and intercooling is controlled according to the comparison between the pressure difference of the front and rear of the air inlet throttle of the engine and the calibrated theoretical pressure difference. Further, a mixed gas control valve is arranged, and the ECU outputs a current or voltage signal to the mixed gas control valve according to the comparison of the pressure difference of the front and the rear of the air inlet throttle valve and the calibrated theoretical pressure difference, and controls the opening degree of the mixed gas control valve to control the supply quantity of the mixed gas. Further, the supply of crankcase exhaust gas is controlled based on a comparison of the pressure measurement in the crankcase with a calibrated theoretical pressure. Further, a crankcase waste gas control valve is arranged, the ECU outputs a current or voltage signal to the crankcase waste gas control valve according to the comparison of the pressure measured value and the calibrated theoretical pressure, and the opening degree of the crankcase waste gas control valve is controlled to control the supply quantity of crankcase waste gas. Further, the crankcase waste gas and the mixed gas after supercharging and intercooling are mixed with fuel gas and air again through a mixer. Further, the mixer is connected with the crankcase waste gas channel, the fuel gas channel and the mixed gas channel in sequence from the air inlet. Further, the mixer is sequentially connected with the mixed gas channel, the crankcase waste gas channel and the fuel gas channel from the air inlet. Advantageous effects Compared with the prior art, the invention has the advantages that: The invention calculates the required gas quantity according to the running speed and power of the engine by a speed density method, controls the gas supply quantity according to the required gas quantity, controls the supply quantity of the mixed gas after supercharging and intercooling according to the comparison between the pressure difference before and after an air inlet throttle of the engine and the calibrated theoretical pressure difference, controls the supply quantity of crankcase waste gas according to the comparison between the pressure measured value in a crankcase and the calibrated theoretical pressure, and mixes the crankcase waste gas, the supercharged and intercooling mixed gas, the gas and the air again through a venturi mixer and then supplies the mixture to the engine through a gas compressor and an intercooler, thereby reducing the exhaust emission, improving the engine efficiency, controlling the air inflow of the engine, improving the speed regulation and load control responsiveness and adjusting the supercharger ada