- Gas inlet
- Vapour phase gas filter
- Gas injectors
- LPG controller
Shows the gas level in the tank. It also features a button that allows you to select the fuel type used by the engine.
A fuel tank where liquid gas is stored. It is usually mounted in the spare wheel housing or suspended under the car (in the case of toroidal tanks). On the other hand, cylinder-shaped tanks are typically mounted inside the boot. Some vehicles have more than one tank installed.
It is an essential tank component that controls the gas fueling process and the proper gas flow to downstream parts of the system. Includes 7 mini-valves, i.e. an electromagnetic valve, pressure relief device, non-return valve, 80% filling limiter, excess flow valve, pressure relief valve and manual service valve.
Gas inlet with a non-return valve – it is usually found under the fuel tank flap, right next to the petrol filler.
Reducer with an integrated gas valve. Otherwise known as an evaporator. It performs two tasks, i.e. heating the liquid gas to turn it into vapour and maintaining the appropriate gas pressure during engine operation.
Eliminates contaminants and centrifuges the gas to eliminate oil fractions. It is mounted before the gas injectors.
Measures the temperature and pressure of the gas stream. It feeds this data to the controller so that the latter can set the correct operating parameters for the injectors.
They inject precisely calculated doses of gas into the intake manifold channels. Gas injectors are installed either individually or in the form of the so-called injection rails.
A sophisticated computer that controls and monitors the operation of all system components.
An autogas system step by step
- The first step is to fill the tank with autogas. The fuel stored in the tank starts to travel towards the engine once the latter has been started. A multivalve opens at the very start and feeds liquid LPG into a gas distributor under high pressure.
- Fuel flows through an LPG solenoid valve, and once it has been pre-cleaned, to the regulator. At this stage, the gas evaporates and its pressure is reduced to about 2 bar.
- Though already in the vapour phase, the gas does not slow down and goes to the vapour phase filter for the next stage of contaminant removal.
- The mapsensor measures the pressure of the gas fed to the injectors and the negative pressure generated in the intake system. It then passes this data to the controller, which corrects accordingly and selects the appropriate gas injection timing.
- Afterwards, the clean and ready-to-combust gas goes directly to the LPG injectors, then to the intake manifold (separately to each intake channel), and finally to the engine combustion chambers. The timing of feeding the gas to the intake manifold’s individual channels is identical to the sequence of engine operation on petrol.
- This complex operation is managed by a sophisticated computer – the controller. It controls the electromagnetic valves , monitors the gas parameters (temperature and pressure) and determines the injector opening/closing times (which can be different for each cylinder).
- Finally, it also ensures smooth switching between fuel types upon pressing the petrol/gas button located on the car’s dashboard control panel – the final component of the system. What is the result? Click the button and drive on autogas.
Smart technologies by ALEX
The gas is managed by intelligent electronics included in the gas system components every step of the way from the tank to the engine.
Sometimes when you accelerate while the engine is still cold, the fuel type immediately switches from gas to petrol. Surely you already know it is no accident. This happens when the engine receives too large a dose of cold fuel. This is detected by the reducer, which is equipped with a housing temperature sensor. It immediately sends a signal to the controller, which reacts by switching the fuel type to petrol. Only once the engine reaches the right temperature will the controller switch the system back to using gas.
It is worth noting that despite the engine start process automatically using petrol by default, all ALEX systems also feature an emergency start function that allows you to start your engine using gas in case of a failure in the petrol system.
Did you know that the multivalve OCTOPUS consists of as many as 7 mini-valves? It is these valves that ensure the safe operation of your LPG system.
The first one is an 80% filling limiter, which leaves a 20% air buffer in the tank.
The pressure relief valve protects the system against excessive pressure build-up.
The pressure relief device activates at temperatures above 110oC.
It opens when the engine starts and closes once the engine stops running.
It protects the system against an excessive gas flow exceeding the engine’s requirements.
It ensures that LPG fuel flows only towards the gas tank during refueling.
It is primarily used for maintenance work, e.g. filter replacement.
Allows you to easily check the tank fill level.
A safe and proven system
Fourth-generation LPG systems are safe and smart solutions.
They have been refined to perfection over time, ensuring their technological maturity, and feature advanced electronics, thoroughly tested components and the finest materials available. Despite the existence of next-generation LPG systems, the most commonly installed LPG systems in the world are still the sequential autogas injection systems.