• The engine operates in gas mode during the suction stroke, where a lean air-gas mixture is drawn into the cylinders.
• The cylinder head is equipped with a gas admission valve positioned in the air inlet passage, and there is a fuel injector capable of both main and pilot injection.
• A common rail computer-operated pilot fuel injection system is utilised, providing precise control over the injected fuel. This system can easily regulate or shut off the fuel injected through the main injector nozzles.
• During engine startup, diesel fuel is used for ignition, employing both pilot and main injection. Once combustion is stable, the engine transitions to a gas supply. This transition typically takes about one minute, during which the substitution of fuel oil by gas occurs gradually.

(ii) Diesel Cycle:

• As a two-stroke engine uses intake air for scavenging, it's essential not to mix the gas fuel with the intake air.
• Instead, the gas fuel is injected into the compressed air, similar to the injection process for diesel fuel.
• Ignition is achieved by injecting fuel via the micro-pilot fuel injector, resulting in diffusion combustion.
• This approach not only reduces CO emissions by 20% or more but also maintains low levels of unburned gas and CO emissions without the occurrence of knocking. The utilisation of micro-pilot fuel injection ensures a controlled and efficient combustion process, optimising the performance of the dual-fuel engine burning natural gas.