NGV Engine Systems
Fumigation (mixer): This system suits vehicles with carburetors.
Principle: High-pressure NGV from the container flows to the pressure regulator, which dispatches NGV to blend with air at the inlet manifold, using the gas mixer, for eventual flow to the combustion chamber. The volume of such dispatched gas varies with how much the gas adjustment screw is set. This relatively cheap system is fairly simple to install, but has higher fuel consumption than the injection system.
Injection: This system suits fuel-injection engines found in post-1995 models.
Principle: Thanks to smart sensors of the vehicle's conditions, including temperature and atmospheric pressure, an ECU neatly emulates a fuel injector in every revolution of the engine, thus enabling the performance and engine power to closely resemble conditions of the gasoline system and fuel dispatch and be more precise. As a result, fuel consumption is superior to that of the fumigation system. Note that tuning of the gaseous system calls for a computer.
NGV Vehicle Types
- Dedicated NGV
Most of these are OEM (original equipment manufactured), designed to run solely on NGV, and by design their NGV tanks are neatly packed in both small and large vehicles
- Bi-Fuel System
Under this system suitable for gasoline engines, motorists can choose either gasoline or NGV as the fuel simply by button switching. Commonly found in small vehicles, this system is found in either NGV engines direct from manufacturers or retrofitted with NGV equipment.
- Diesel Duel Fuel System (DDF)
Under this system suitable for diesel engines, motorists can choose either the diesel-NGV combination or only diesel by button switching. The volumetric ratio of NGV to diesel varies with engine types and NGV equipment efficiency. DDF is found in vehicles of all sizes. During the early days of NGV promotion, diesel engines used to be modified to run solely on NGV, called the dedicated retrofit system, which relies on modification of cylinders and cylinder head, installation of spark plugs to induce ignition, and transformation of the diesel engine into an NGV engine, using the same chassis. This method is called re-powering.
During the early days of NGV promotion, diesel engines used to be modified to run solely on NGV, called the dedicated retrofit system, which relies on modification of cylinders and cylinder head, installation of spark plugs to induce ignition, and transformation of the diesel engine into an NGV engine, using the same chassis. This method is called re-powering.
Note: Small vehicles consist of passenger cars, pickups, and vans. Large vehicles consist of trucks, tractors, and buses.
- Gas Business
- International Trading Business
Technology and Engineering Business
- Innovation and Digital
- Engineering and Project Management
- EECi @ Wangchan Valley Project
- Businesses Invested through PTT Group Companies