Method and system of intensifier piston control

A fuel injector comprising:

• a high pressure actuation fluid source;
• a low pressure drain;
• a flow control valve connected with said high pressure actuation fluid source and said low pressure drain;
• an intensifier piston connected to said flow control valve;
• said flow control valve controlling the flow rate between said flow control valve and said intensifier piston and having a first flow rate in a first direction and a second flow rate, different from said first flow rate, in a second direction.

A fuel injector comprising:

• a high pressure actuation fluid source;
• a low pressure drain;
• at least one fluid line selectively connected to one of said high pressure actuation fluid source and said low pressure drain;
• an intensifier piston fluidly connected to said fluid line;
• a flow control valve in fluid communication with said fluid line and said intensifier piston and positioned to control flow to and from said intensifier piston;
• and
• said flow control valve having a flow in a first direction and a second direction and said flow control valve having a flow restriction for said flow in said first direction.

A fuel injector comprising:

• a high pressure actuation fluid source;
• a low pressure drain;
• at least one fluid line;
• means for selectively connecting said fluid line to one of said high pressure actuation fluid source and said low pressure drain;
• an intensifier piston fluidly connected to said fluid line;
• a flow control valve in fluid communication with said fluid line and said intensifier piston and positioned to control a rate of flow to and from said intensifier piston;
• and
• said flow control valve having a first flow rate in a first direction and a second rate, different from said first rate in a second direction.