2 thoughts on “Who knows the principle of LPG engine”
Rudolph
The principle of LPG system composition and working principle 1.1LPG system mainly composition and working principle. For composition, see Figure 1. When the fuel conversion switch is allocated to the LPG position, the gasoline electromagnetic valve is broken (cutting off the gasoline supply), and the LPG solenoid valve is powered on. The LPG liquid came out of the gas storage tank, reached the evaporator through the LPG solenoid valve, and turned into a gas with pressure and vaporization into a gas closer to the atmospheric pressure. LPG gas flows through the power regulating valve to the Wen’s tube mixture. It is fully mixed with the air in the Wen’s pipe hybrid. According to the engine’s operating conditions, a certain amount of LPG gas is supplied to the laryngeal tube of the carburetor (only the channel effect) Essence 1.2 The gas storage tank is installed in the luggage cabin at the rear of the car. Its role is to store LPG with an integrated valve installed on it to ensure the safe use of the gas storage tank and the entire system. The structure of the integrated valve is shown in Figure 2. The role of each part of the integrated valve is as follows: Employment of one -way valve: When losing LPG, the pressure of LPG overcome the spring force to open the unidirectional valve. Prevent the effect of LPG return; limited charging valve: When LPG is with LPG, limited charging floats gradually float as the LPG liquid surface increases, and when the LPG in the gas storage tank reaches the set height (about 75%-80%), the lpg in the gas storage tank, about 75%-80%),,, about 75%-80%),,, when the lpg reaches the set height (about 75%-80%),,, when Limit the shutdown valve closure, limit LPG to continue to fill, thereby providing the expansion space of LPG necessary due to increased temperature; liquid level sensor: used to perceive the height of the liquid surface in the gas storage tank, and transmit the liquid surface signal to the driving driving Indoor oil meter; safety release valve: When the pressure in the storage tank exceeds the set safety limit pressure, the safety valve automatically opens the release LPG. When the pressure drops to the setting of the setting of the set, it will be automatically closed to prevent pressure due to pressure due to pressure. Safe accidents occur. Ultra -traffic trial valve: Installed at the outlet. When the LPG pipe is ruptured and a large amount of leakage (flow exceeds 215ml/s), the gas transmission channel is turned off. Only the small hole in the middle of the valve core has 3.3ml/s liquid flowing out. Manual closure valve: In emergency situations, manually close the liquid flowing from the outlet to the gas transmission pipe. 1.3 Gasoline solenoid valve and LPG solenoid valve are skewed into a gasoline solenoid valve in the upper gasoline pipeline, and a LPG solenoid valve is set in the LPG pipeline. Their role is to connect (cut) gasoline or LPG during fuel conversion. 1.4 The evaporator evaporator (also known as the pressure regulator, vaporization device), which is to reduce the LPG from the gas storage tank through the pressure. In order to accelerate vaporization, the engine’s circulating cooling water is used for heating. There is a starting (idle) solenoid valve installed on the evaporator. When the ignition switch is turned on, the starting (idle) solenoid valve is connected. The LPG required for idle speed enters the engine cylinder. It is shown in Figure 3. 1.5 Power adjustment valve and Wen’s pipe mixture air -fuel ratio regulating valve have the function of adjusting the engine air -fuel ratio. It changes the fuel channel area by two adjustment screws to adjust the fuel flow. The Wen’s pipe mixture is installed between the air filter and the carburetor, and its throat has multiple holes to make the LPG mixes with the air here. 1.6 The fuel conversion switch is used to achieve the choice and conversion between the two fuels of gasoline and LPG. 1.7 System circuit control System circuit (1) When the conversion switch is dial to the LPG position, the 6 and 8 wiring columns of the switch are connected (green indicator light). Switch work to connect the 2 and 8 wiring columns, the entrance solenoid valve and idle computer valve are turned on, and LPG is provided to the engine. At the same time, the 5 and 7 wiring columns of the conversion switch are connected to power the LPG liquid level sensor, and the signal is passed to the oil meter in the cab to show the LPG liquid level in the gas storage tank. (2) When the conversion switch is dial to the PET (gasoline) position, the conversion switch 6 and 4 wiring columns are connected (red indicator lights), gasoline solenoid valve is turned on, and gasoline is used for automobiles. At the same time, the switch 5 and 3 are turned on, and the amount of gasoline shows the amount of gasoline. (3) When the conversion switch is dialed to the middle position, both fuels are not turned on, and the fuel meter returns to zero. 2. The use and maintenance of the LPG system 2.1 The conversion vehicle of fuel can be converted during driving. However, in order to drive safety, it is best to change the parking and engine in idle operation. (1) The gasoline is converted to LPG to dial the fuel conversion switch to the middle position, and then gently step on the throttle until the engine is about to stop turning to the LPG position. Then step on the accelerator pedal, then you can convert from gasoline to LPG. If the engine is turned off, just start the engine. (2) The LPG is converted into a gasoline first to open the throttle (the engine speed is increased), and then quickly dial the fuel selection switch to the FET (gasoline) gear. 2.2 Precautions for usage and maintenance (L) When the car is fuel with LPG, the manual closing valve on the gas storage tank should be fully opened, otherwise it will cause insufficient fuel supply; The manual closure of the valve, because the tool is turned on or closed, it may cause permanent damage to the valve, which will cause the valve to operate in an emergency. (3) The safety release valve has been automatically released under the pressure of 2.50MPa before leaving the factory. When the pressure in the gas storage tank is reduced to 1.80MPa, it will be automatically closed. Regular (such as one week) driving with gasoline once, and mileage of at least 10 liters of gasoline with gasoline per week to ensure that the gasoline system is in a good working state; when the parking time is more than two days, the manual closing valve on the gas storage tank should be closed; 5) When using LPG, if you smell the taste of LPG (because the lpg is added with a smelling agent, if you leak, you will smell a stinky egg flavor), you should deal with On the side of the road, turn off the engine and electric equipment on the car; B. Turn off the manual shutdown valve on the gas storage tank, and then notify the maintenance personnel for maintenance; C. Take out the fire extinguisher to prepare; Cover, carefully check the leakage area and cause, be careful not to touch the leakage place with your hands to avoid frostbite skin; E. If it is due to the pipeline connection, the pipeline is re -connected. ; F. If it is a equipment problem, use gasoline to drive after the smell is dispersed, and then notify the maintenance personnel for maintenance as soon as possible. (6) When the car is maintained, the manual closing valve on the gas storage tank should be closed, and the parking area of the car should be listed as a first -class fire prevention area to avoid accidents. Road, evaporation compressor and other components.
LPG refers to a mixture of low -molecular weight hydrocarbon compounds such as butthlate and propane such as natural gas treatment plants and refining plants. The LPG produced by the natural gas treatment plant is a liquid hydrocarbon mixture based on propine and butane, and the LPG from the refinery is a liquid hybrid hydrocarbon based on propane, acryl and butane, and butylne. Line -liquefied petroleum gas can be turned into liquid at normal temperature (about 1.6MPa) at normal temperature, which is more convenient to use. After decompression and gasification of the liquid LPG, the mixer is uniformly mixed with the air. The formation and distribution of this mixture is better than gasoline, and it does not contain lead and sulfur. The engine is relatively stable. When it is cold and short -distance, the engine lubricating oil will not be diluted. The time gap between the replacement of lubricating oil can be lengthened. LPG has high thermal value, mixed gas with air, and complete combustion, which can improve the power of the car; LPG has high fire temperature and good safety; but there are also problems such as short driving distance and poor gas storage cylinders and their safety. In the low hexane value of LPG, after the fuel enters the cylinder from the premix mode, on the one hand, it will make the fire delay period of the diesel engine longer, and on the other hand, it also reduces the volume efficiency of the engine. At the same time, this part of the fuel exists in the form of homogeneous mixing gas, so that the distribution of air -combustion -ratios in the cylinder is different from pure diesel. These will affect the combustion process in the cylinder, such as burning temperature, pressure, and heat -heating rate. It affects the power, economy and emissions of the engine. There are many factors affecting LPG-diesel dual fuel engine emissions. In addition to the proportion of LPG, they are also affected by engine operating parameters (such as load and speed) and fuel injection. , The engine harmful emission changes with the change of LPG ratio and load.
The principle of LPG system composition and working principle 1.1LPG system mainly composition and working principle. For composition, see Figure 1. When the fuel conversion switch is allocated to the LPG position, the gasoline electromagnetic valve is broken (cutting off the gasoline supply), and the LPG solenoid valve is powered on. The LPG liquid came out of the gas storage tank, reached the evaporator through the LPG solenoid valve, and turned into a gas with pressure and vaporization into a gas closer to the atmospheric pressure. LPG gas flows through the power regulating valve to the Wen’s tube mixture. It is fully mixed with the air in the Wen’s pipe hybrid. According to the engine’s operating conditions, a certain amount of LPG gas is supplied to the laryngeal tube of the carburetor (only the channel effect) Essence 1.2 The gas storage tank is installed in the luggage cabin at the rear of the car. Its role is to store LPG with an integrated valve installed on it to ensure the safe use of the gas storage tank and the entire system. The structure of the integrated valve is shown in Figure 2. The role of each part of the integrated valve is as follows: Employment of one -way valve: When losing LPG, the pressure of LPG overcome the spring force to open the unidirectional valve. Prevent the effect of LPG return; limited charging valve: When LPG is with LPG, limited charging floats gradually float as the LPG liquid surface increases, and when the LPG in the gas storage tank reaches the set height (about 75%-80%), the lpg in the gas storage tank, about 75%-80%),,, about 75%-80%),,, when the lpg reaches the set height (about 75%-80%),,, when Limit the shutdown valve closure, limit LPG to continue to fill, thereby providing the expansion space of LPG necessary due to increased temperature; liquid level sensor: used to perceive the height of the liquid surface in the gas storage tank, and transmit the liquid surface signal to the driving driving Indoor oil meter; safety release valve: When the pressure in the storage tank exceeds the set safety limit pressure, the safety valve automatically opens the release LPG. When the pressure drops to the setting of the setting of the set, it will be automatically closed to prevent pressure due to pressure due to pressure. Safe accidents occur. Ultra -traffic trial valve: Installed at the outlet. When the LPG pipe is ruptured and a large amount of leakage (flow exceeds 215ml/s), the gas transmission channel is turned off. Only the small hole in the middle of the valve core has 3.3ml/s liquid flowing out. Manual closure valve: In emergency situations, manually close the liquid flowing from the outlet to the gas transmission pipe. 1.3 Gasoline solenoid valve and LPG solenoid valve are skewed into a gasoline solenoid valve in the upper gasoline pipeline, and a LPG solenoid valve is set in the LPG pipeline. Their role is to connect (cut) gasoline or LPG during fuel conversion. 1.4 The evaporator evaporator (also known as the pressure regulator, vaporization device), which is to reduce the LPG from the gas storage tank through the pressure. In order to accelerate vaporization, the engine’s circulating cooling water is used for heating. There is a starting (idle) solenoid valve installed on the evaporator. When the ignition switch is turned on, the starting (idle) solenoid valve is connected. The LPG required for idle speed enters the engine cylinder. It is shown in Figure 3. 1.5 Power adjustment valve and Wen’s pipe mixture air -fuel ratio regulating valve have the function of adjusting the engine air -fuel ratio. It changes the fuel channel area by two adjustment screws to adjust the fuel flow. The Wen’s pipe mixture is installed between the air filter and the carburetor, and its throat has multiple holes to make the LPG mixes with the air here. 1.6 The fuel conversion switch is used to achieve the choice and conversion between the two fuels of gasoline and LPG. 1.7 System circuit control System circuit (1) When the conversion switch is dial to the LPG position, the 6 and 8 wiring columns of the switch are connected (green indicator light). Switch work to connect the 2 and 8 wiring columns, the entrance solenoid valve and idle computer valve are turned on, and LPG is provided to the engine. At the same time, the 5 and 7 wiring columns of the conversion switch are connected to power the LPG liquid level sensor, and the signal is passed to the oil meter in the cab to show the LPG liquid level in the gas storage tank. (2) When the conversion switch is dial to the PET (gasoline) position, the conversion switch 6 and 4 wiring columns are connected (red indicator lights), gasoline solenoid valve is turned on, and gasoline is used for automobiles. At the same time, the switch 5 and 3 are turned on, and the amount of gasoline shows the amount of gasoline. (3) When the conversion switch is dialed to the middle position, both fuels are not turned on, and the fuel meter returns to zero. 2. The use and maintenance of the LPG system 2.1 The conversion vehicle of fuel can be converted during driving. However, in order to drive safety, it is best to change the parking and engine in idle operation. (1) The gasoline is converted to LPG to dial the fuel conversion switch to the middle position, and then gently step on the throttle until the engine is about to stop turning to the LPG position. Then step on the accelerator pedal, then you can convert from gasoline to LPG. If the engine is turned off, just start the engine. (2) The LPG is converted into a gasoline first to open the throttle (the engine speed is increased), and then quickly dial the fuel selection switch to the FET (gasoline) gear. 2.2 Precautions for usage and maintenance (L) When the car is fuel with LPG, the manual closing valve on the gas storage tank should be fully opened, otherwise it will cause insufficient fuel supply; The manual closure of the valve, because the tool is turned on or closed, it may cause permanent damage to the valve, which will cause the valve to operate in an emergency. (3) The safety release valve has been automatically released under the pressure of 2.50MPa before leaving the factory. When the pressure in the gas storage tank is reduced to 1.80MPa, it will be automatically closed. Regular (such as one week) driving with gasoline once, and mileage of at least 10 liters of gasoline with gasoline per week to ensure that the gasoline system is in a good working state; when the parking time is more than two days, the manual closing valve on the gas storage tank should be closed; 5) When using LPG, if you smell the taste of LPG (because the lpg is added with a smelling agent, if you leak, you will smell a stinky egg flavor), you should deal with On the side of the road, turn off the engine and electric equipment on the car; B. Turn off the manual shutdown valve on the gas storage tank, and then notify the maintenance personnel for maintenance; C. Take out the fire extinguisher to prepare; Cover, carefully check the leakage area and cause, be careful not to touch the leakage place with your hands to avoid frostbite skin; E. If it is due to the pipeline connection, the pipeline is re -connected. ; F. If it is a equipment problem, use gasoline to drive after the smell is dispersed, and then notify the maintenance personnel for maintenance as soon as possible. (6) When the car is maintained, the manual closing valve on the gas storage tank should be closed, and the parking area of the car should be listed as a first -class fire prevention area to avoid accidents. Road, evaporation compressor and other components.
LPG refers to a mixture of low -molecular weight hydrocarbon compounds such as butthlate and propane such as natural gas treatment plants and refining plants. The LPG produced by the natural gas treatment plant is a liquid hydrocarbon mixture based on propine and butane, and the LPG from the refinery is a liquid hybrid hydrocarbon based on propane, acryl and butane, and butylne. Line -liquefied petroleum gas can be turned into liquid at normal temperature (about 1.6MPa) at normal temperature, which is more convenient to use. After decompression and gasification of the liquid LPG, the mixer is uniformly mixed with the air. The formation and distribution of this mixture is better than gasoline, and it does not contain lead and sulfur. The engine is relatively stable. When it is cold and short -distance, the engine lubricating oil will not be diluted. The time gap between the replacement of lubricating oil can be lengthened. LPG has high thermal value, mixed gas with air, and complete combustion, which can improve the power of the car; LPG has high fire temperature and good safety; but there are also problems such as short driving distance and poor gas storage cylinders and their safety.
In the low hexane value of LPG, after the fuel enters the cylinder from the premix mode, on the one hand, it will make the fire delay period of the diesel engine longer, and on the other hand, it also reduces the volume efficiency of the engine. At the same time, this part of the fuel exists in the form of homogeneous mixing gas, so that the distribution of air -combustion -ratios in the cylinder is different from pure diesel. These will affect the combustion process in the cylinder, such as burning temperature, pressure, and heat -heating rate. It affects the power, economy and emissions of the engine. There are many factors affecting LPG-diesel dual fuel engine emissions. In addition to the proportion of LPG, they are also affected by engine operating parameters (such as load and speed) and fuel injection. , The engine harmful emission changes with the change of LPG ratio and load.