LPG dual-fuel vehicle system structure and maintenance – repairs, maintenance –
Main components of C burning (G3H8) and butane (G4H10). LPG in the gas under normal temperature and pressure, just a little pressure or cooling can be turned into liquid. As the 12 higher octane number, so it is an ideal vehicle fuel. Related Reading: DIY car repair auto repair self-taught how to transform into sharp brother Improper operation of car repair care killed "five taboo"
Dual-fuel vehicles in the preservation of the original vehicle fuel system, the installation of an LPG supply system, the process required the use of petrol and LPG can freely switch between. Car fueled with LPG and fuel with gasoline as Drive Members only need to manipulate Accelerator Pedal, you can change the engine operating conditions to meet the performance requirements for car driving.
1. LPG system components and working principle
1.LPG system main components and working principle
The system by the gas tank, evaporator pressure regulator, gas solenoid valve, LPG solenoid valve, power valve, venturi mixers, fuel switch, control circuit and other components.
Switch to LPG as fuel switching position, the gas solenoid valve power (to cut off gas supplies), LPG solenoid valve power. LPG liquid from the tank out of reach through the LPG evaporator pressure regulator valve, through blood pressure, vaporized into the gas close to atmospheric pressure. LPG gas flows through the power control valve to the venturi mixer, mixer in the Venturi tube with air mix, according to engine operating conditions to the diffuser (only from the channel effect) Office supply a certain amount of LPG gas .
2. Tank Gas tank installed in the rear baggage compartment, whose role is to store LPG, installed above the integrated valve, for gas tank and the entire system to ensure safe use.
The role of integrated valve parts as follows:
Filling one-way valve: in full time plus LPG, LPG pressure to overcome the spring force open the check valve, stop charging extra time, one-way valve in the return spring automatically shut down under, play a role in preventing the return of LPG ;
Limited to filling valve: LPG charge increases, the limit of LPG filling with liquid level float increased gradually go up, when the LPG gas tank in the liquid level reaches the set (about 75% -80%), the limit of filling valve Close to restrict filling of LPG continue to provide the necessary temperature rise because the expansion of LPG space;
Level Sensor : For sensing liquid level inside the tank, and liquid level signals to the cab of the fuel gauge;
Safety release valve: When the pressure inside the tank exceeds a set safety limit pressure, the valve automatically opens the release of LPG, when the pressure drops to a lower set pressure, then automatically shut down, and prevent excessive pressure security incident.
Super flow valve: installed in a liquid mouth, when the LPG pipeline rupture, resulting in large leak (flow rate more than 215ml / s), close the gas transmission channel, only the middle spool holes have 3.3ml / s liquid outflow.
Manually close the valve: emergency, I manually shut down the flow of liquid from the liquid gas pipeline.
3. Petrol solenoid valve, LPG solenoid valve in the gas line in the original series into a gas solenoid valve, in the LPG pipe of an LPG solenoid valve, their role is to connect the fuel conversion (cut) gasoline or LPG.
4. Evaporator mobilization Evaporation regulator (also known as voltage regulator, carburetor), whose role is to come from the LPG gas tank after decompression, after evaporation, to a certain pressure to supply mixers. To speed up evaporation, using the engine cooling water to heat.
Evaporator pressure regulator installed a starter ( Idle ) Solenoid valve, when open the ignition switch, start (idle) solenoid valve was connected to the electromagnetic coil produces the magnetic force to overcome the spring tension to idle idle needle aspiration from the valve seat, idle will be required to enter the engine cylinder LPG.
5. Power control valve and venturi mixer air-fuel ratio control valve capable of regulating the functions of the engine air-fuel ratio, it is to change the fuel through the two adjusting screws to adjust the fuel flow channel area. Venturi mixer installed in the carburetor air filter and between the Department of its uniform pipe with multiple holes, so that LPG and air mix in this.
6. Fuel switch Gasoline and LPG used to implement the choice between two types of fuel conversion.
7. System circuit control system (1) switch to LPG when the change position, switch terminal connected to the 6 and 8 (green indicator light), D / 6 terminal pulse signal to the safety switches with 6 terminal, safety switches work connected to terminal 2 and 8, the entrance valve solenoid valve and idle computers to open, the engine LPG. Meanwhile, the changeover switch 5 and 7 terminal connected to the LPG level sensor power and signals to the cab of the fuel gauge shows gas tank liquid level within the LPG.
(2) when the conversion switch to PET (gasoline) position, the switch connected to terminal 6 and 4 (red indicator light), fuel solenoid valve to open, cars fueled with gasoline. 5 and 3 at the same time switch connected to the oil scale display of petrol.
(3) When the conversion switch to the middle position, two types of fuel not turn on, fuel gauge back to zero.
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