Patent ID: 8480009
Filing Date: 2013-07-09
Classification: F02M

Abstract:
1. A fuel system comprising: a source of heavy fuel oil; a source of distillate diesel fuel; a common rail fluidly connected to at least one of the source of heavy fuel oil and the source of distillate diesel fuel; a plurality of fuel injectors that each include an injector body that defines at least one common rail inlet, a drain outlet, a nozzle outlet, a cooling inlet and a cooling outlet, and having disposed therein a pilot control chamber, an intermediate control chamber, a needle control chamber and a nozzle chamber; a pilot valve member movable between a first position at which the pilot control chamber is fluidly connected to the drain outlet, and a second position at which the pilot control chamber is blocked from the drain outlet; a control valve member with a guide surface separating a first hydraulic surface exposed to fluid pressure in the pilot control chamber, and a second hydraulic surface exposed to fluid pressure in the intermediate control chamber; a needle valve member of a direct operated nozzle check valve with a guide surface separating an opening hydraulic surface exposed to fluid pressure in the nozzle chamber, and a closing hydraulic surface exposed to fluid pressure in the needle control chamber; and an electrical actuator coupled to the direct operated nozzle check valve by the pilot valve member and the control valve member.