Systems and methods provide for cleaning the air intake valves and surrounding areas of an engine. A gravity-fed cleaning-fluid dispenser may feed cleaning fluid into a hose through a metered device that meters a rate at which the cleaning fluid flows into the hose. A second fluid meter connected to a distal end of the hose further meters the rate at which a mixture of the cleaning fluid and air from is dispersed into the running GDI engine. Cleaning fluid may be distributed to the engine at a gradually decreasing rate as a volume of cleaning fluid in the dispenser decreases as the service progresses.

A method and system is provided for reducing surface roughness of a diesel engine component. The method and system may apply a voltage to a plasma electrolyte polishing cell. The plasma electrolyte polishing cell may include a diesel engine component and an aqueous electrolyte solution. The method and system may cause a plasma layer to form around a surface of the diesel engine component as a result of applying the voltage to the plasma electrolyte polishing cell. The method and system may terminate the voltage to the plasma electrolyte polishing cell. The method and system may apply a coating process to the diesel engine component.

This invention relates to compositions and methods for inhibiting corrosion and deposit formation in fuel handling equipment, with reduced or eliminated incidence of fuel filter plugging and internal diesel injector deposits (IDID) in the equipment that eventually employs the final commercially blended form of the fuel. More specifically, the invention relates to inhibiting corrosion from the walls of fuel pipelines and storage equipment and preventing deposits in engines.

The present invention discloses an on-line cleaning control system and method for carbon deposits in a direct injection engine fuel system. The system comprises a cleaner tank, a cleaner input pipeline, an electromagnetic flow controller and a control circuit. A liquid transfer pump is in series connection with a pipeline of the cleaner input pipeline and the cleaner tank; when the conditions that fuel is injected through a fuel injector of the engine, the temperature of a three-way catalytic converter is lower than 800 C., the rotational speed of the engine is greater than 1200 rpm and the cleaning time is shorter than set cleaning time are met, the control circuit starts a cleaning working procedure to inject a cleaner into an intake manifold of the engine. According to the present invention, the liquid transfer pump is used for actively injecting the cleaner into an intake valve of the engine, and besides, the optimal cleaning condition of the engine is controlled; a starting switch can be arranged in a cab so that on-line cleaning for the carbon deposits in the intake valve and a combustion chamber of the engine is performed actively according to the usage state of an automobile; and also, by receiving a mileage signal and presetting a mileage starting value in the controller, on-line cleaning for the carbon deposits in the intake valve and the combustion chamber of the engine can be performed automatically and periodically in accordance with mileages.

A fuel injector (1) is provided which comprises a valve member (11), a valve member guide (12) and a spring chamber (40). Discharge of fuel out of a fuel injector outlet (21) is controlled by movement of the valve member (11) within a bore (23) of the valve member guide (12). The spring chamber (40) contains a biasing member (50), for example a compression spring, which biases the valve member (11) into contact with a valve seat (20) when in a closed configuration.

A fuel supply passage (80) is provided, which by-passes the spring chamber (40), to direct a flow of the fuel to an outlet chamber (22) of the fuel injector (1) and a cleaning fluid supply passage (90) is provided to supply a pressurised cleaning fluid to a second end (25) of the bore (23) to restrict leakage of the fuel from the outlet chamber (22) towards the second end (25) of the bore (23) along a clearance (29) extending between the valve member (11) and the valve member guide (12).

A method and system is provided for reducing surface roughness of a diesel engine component. The method and system may apply a voltage to a plasma electrolyte polishing cell. The plasma electrolyte polishing cell may include a diesel engine component and an aqueous electrolyte solution. The method and system may cause a plasma layer to form around a surface of the diesel engine component as a result of applying the voltage to the plasma electrolyte polishing cell. The method and system may terminate the voltage to the plasma electrolyte polishing cell. The method and system may apply a coating process to the diesel engine component.