Hydraulically-actuated system having a variable delivery fixed displacement pump

A hydraulically actuated system comprising:

• a fixed displacement pump with at least one piston defining an internal passage and that reciprocates in a pump housing that defines a high pressure area and a low pressure area;
• a control valve attached to said housing and being moveable between a first position in which said piston displaces fluid in a first proportion between said high pressure area and said low pressure area, and a second position in which said piston displaces fluid in a second proportion between said high pressure area and said low pressure area, and said control valve including a sleeve surrounding each said piston, and said sleeve being moveable with respect to said pump housing by an actuator between said first position and a second position, and said actuator being stoppable at a plurality of positions between said first position and said second position;
• a spring operably positioned to bias said control valve toward a position at which said piston displaces a majority of said fluid into said low pressure area;
• a plurality of hydraulically actuated fuel injectors connected to said high pressure area;
• a source of low pressure fluid connected to said low pressure area of said pump;
• and
• an electronic control module in communication with and capable of controlling a position of said control valve.

A hydraulically actuated system comprising:

• a fixed displacement pump with at least one piston defining an internal passage and that reciprocates in a pump housing that defines a high pressure area and a low pressure area;
• a control valve attached to said housing and being moveable between a first position in which said piston displaces fluid in a first proportion between said high pressure area and said low pressure area, and a second position in which said piston displaces fluid in a second proportion between said high pressure area and said low pressure area, and said control valve including a sleeve surrounding each said piston, and said sleeve being moveable with respect to said pump housing by an actuator between said first position and a second position, and said actuator being stoppable at a plurality of positions between said first position and said second position;
• a plurality of hydraulically actuated fuel injectors fluidly connected to said high pressure area;
• a source of low pressure fluid connected to said low pressure area of said pump;
• an electronic control module in communication with and capable of controlling a position of said control valve to stop at said plurality of positions;
• a pressure sensor operably connected to said high pressure area and capable of communicating a pressure signal to said electronic control module;
• and
• an engine operating condition sensor capable of communicating an operating condition signal to said electronic control module.