What is CNG?

Compressed Natural Gas (CNG) is one of the most environment friendly alternative fuels available in the market today.

There are more than 5 million cars driving on CNG in the world today.


What is it ? The Product

The new sequential system offers better performance and reliability to the driver. This advanced system injects gas directly into the intake manifold eliminating any possibility of backfire which may damage the intake manifold. The precision injection of gas offers better fuel consumption, mileage savings and performance when compared to the mixer system. The kit reduces emissions and extends the life of catalytic converter as the ECU detects optimum combustion parameters and engine operating conditions.



How it Works

DREAM XXI P is an advanced injection system, designed for use with the latest petrol powered cars. The gas is delivered from the tank to the Pressure Regulator, that supplies it at a constant pressure to the Injection Unit. This is controlled by the Electronic Control Unit, that computes the correct gas injection timings in function of the petrol injection timings and other system parameters. Gas is injected into the intake manifold ducts in the right sequence and at the right time. The pressure stability of the regulator together with sophisticated electronic carburation control, guarantees a fast response of the system to quick power demands, and a smooth acceleration from cut-off phase. DREAM XXI P also optimizes consumption and performance.


ECU:
The new ECU grants a perfect carburation under all operating conditions. It also guarantees low fuel consumption and excellent driving performances. Designed and manufactured entirely by OMVL spa, it easily handles full-group, semi-sequential and phased sequential injection systems, with Slave and Stand Alone modes on the same board. 2 ECU versions are available: 3-4 cylindersa nd 6-8 cylinders.

The DREAM P has got complete diagnostics features and it is OBD compatible.
The ECU sports: petrol injectors emulator on board, RPM amplifier on board, Oxygen sensor emulator on board, 2 Oxygen sensors supported, suitable for CNG and LPG.

Injector RAIL:
The injection unit ensures that the right quantity of gas is delivered into the intake manifold at the intake valves. The electronic injectors are opened in the right sequence and at the right time to suit the engine's ignition cycle.

Regulator:
The pressure regulator reduces gas pressure and, in the case of the LPG, it also ensures that the liquid gas is completely vaporised. A solenoid valve shuts off the gas flow to the engine, when the engine is not operating.

Gas/Petrol Fuel Switch:
This is the electronic switch that connects to DREAM XXI P ECU. The switch allows toggling between the two fuels and sports a 5-leds level gauge showing the amount of gas remaining in the tank.



Galileo conversion kit
The Galileo conversion kit consists of several parts, which need to be built in the car.

Regulator:
The regulator is the "heart" of the CNG kit; it reduces the pressure, and supplies the CNG to the engine.

Switch:
Switch and fuel gauge in one - with this little device, the driver can chose between driving with Petrol or CNG. A small, integrated LED fuel gauge indicates how much CNG is left in the gas cylinder.

Timing Advance Processor:
Due to the fact that natural gas has different thermodynamic properties, the timing must be modified in order to adapt it to the new fuel.

Inner filling valve:
The gas is pumped through this valve when filling the cylinder.

Petrol Solenoid Valve:
Most of the cars on Singapore's roads are advanced injection engines. However, there are still some vehicles, which have a carburetted engine. No matter what kind of car you have - the Galileo Conversion Kit fits for all Petrol engines. The Petrol Solenoid Valve is one of the few parts which need to be installed additionally, if you have a carburetted car.

Gas cylinder:
The CNG is stored in the gas cylinder under 200 bar pressure. In this example, two gas cylinders are installed. It is absolutely no problem to install more than one cylinder. Doing that increases the mileage before the car needs to be refilled.


First vehicle converted!
Our first vehicle conversion was performed on 1st and 2nd of August. The car is owned by a governmental agency of Singapore.

Vehicle type: Mitsubishi
Displacement: 1.8l
Year of manufacture: 1995

The vehicle is prepared for the retrofitting. Before the installation process is carried out, a diagnosis test of the ECU is performed (only injection engines). This way, possible engine problems can easily be detected.
The Kit with all its components. It consists of several parts, such as the regulator, the timing advance processor, lambda sensor emulator, injector emulator, and a number of valves and hoses. The white pipe on the right is a high-pressure pipe. The gas flows through it with a pressure of 200 bar.
The regulator is the "heart" of the conversion kit. It reduces the pressure of the CNG coming from the cylinder from 200 bar to the operating pressure of 3 bar.

In this picture, the regulator is already fixed in the engine compartment. The thick black hose leads directly to the mixer, which is installed in front of the air-inlet of the engine.

Fuel gauge and filling valve. The instrument on the left is an analogue fuel gauge. It basically measures the gas pressure in the cylinder(s). This value is then digitalized and sent to the LED-fuel gauge, which is installed in the dashboard of the vehicle.

The Timing Advance Processor (TAP), the Injector Emulator, and the Lambda Sensor Emulator. The TAP is probably the most important electronic device of the kit. It controls the exact timing of the spark, and therefore cares for the optimal combustion of the CNG.

After the installation, various tests are performed. In this picture, the emissions of the vehicle are tested with a four-gas analyser. With this device, the vehicle can be "tuned", until the combustion reaches optimal emission values.
Dynamometer Test. With this optional test, the torque of the vehicle is measured. It can be determined at which rotation the highest torque is rendered.

During the test, the car is accelerated, and is operated in different gears.
The boot of the station wagon before the installation. The boot is big enough to accommodate some luggage.
After the installation: the cylinder is installed and tightly fixed. It weighs 67.5 kg (empty), has a capacity of 60l, which is 15 m³, has a diameter of 35 cm and is 95 cm in length.

If the cylinder should not be visible, a wooden "box" can be installed around the cylinder, in order to conceal it. This "box" is strong enough, that bags or other items can be placed on it.