Patent ID: 9068539
Filing Date: 2015-06-30
Classification: F02D,F02M,Y02T

Abstract:
1. A fuel injector comprising: an injector body defining a first fuel type inlet, a second fuel type inlet, a first nozzle outlet set, a second nozzle outlet set and a drain outlet, and having disposed therein a first control chamber and a second control chamber; a first check valve member defining a through passage and being positioned entirely inside the injector body with a closing hydraulic surface exposed to a fluid pressure in the first control chamber, and being movable between a closed position in contact with a first seat on the injector body covering the first nozzle outlet set to fluidly block the first fuel type inlet to the first nozzle outlet set, and an open position out of contact with the first seat to fluidly connect the first fuel type inlet to the first nozzle outlet set, wherein the fluid pressure present at the closing hydraulic surface in the first control chamber acts to keep or move the first check valve member in the closed position, the fluid pressure at the closing hydraulic surface when the first check valve member is in the closed position being higher than the fluid pressure for the open position of the first check valve member; a second check valve member positioned entirely inside the injector body with a closing hydraulic surface exposed to a fluid pressure in the second control chamber, and being movable between a closed position in contact with a second seat on the first check valve member to fluidly block the second fuel type inlet to the through passage and the second nozzle outlet set, and an open position out of contact with the second seat to fluidly connect the second fuel type inlet to the through passage and the second nozzle outlet set, wherein the fluid pressure present at the closing hydraulic surface in the second control chamber acts to keep or move the second check valve member in the closed position, the fluid pressure at the closing hydraulic surface when the second check valve member is in the closed position being higher than the fluid pressure for the open position of the second check valve member; a first control valve attached to the injector body and having a first configuration at which the first control chamber is fluidly blocked to the drain outlet, and a second configuration at which the first control chamber is fluidly connected to the drain outlet; and a second control valve attached to the injector body and having a first configuration at which the second control chamber is fluidly blocked to the drain outlet, and a second configuration at which the second control chamber is fluidly connected to the drain outlet.