Hydraulic fuel system

A hydraulically-operated electronically controlled fuel injector system for an internal combustion engine for actuating a fuel injector, the system comprising:

• a controller able to receive an actuating fluid pressure measurement from an ICP sensor;
• an IPR valve;
• an internal high pressure oil circuit comprising at least one high pressure oil reservoir, a high pressure pump disposed in a high pressure puma housing and operatively connected to the integrated low pressure oil reservoir, and an internally disposed high pressure oil line operatively connected to the high pressure pump and the at least one high pressure oil reservoir;
• wherein the high pressure pump housing comprises a high pressure pump cover and a high pressure pump mounting in a first area of a crank case;
• and
• a low pressure oil circuit comprising an integrated oil reservoir;
• wherein the controller selectively modifies pressure in the high pressure oil circuit via selective actuation of the IPR valve to obtain a desired pressure in the high pressure oil circuit.

A high pressure oil circuit for use in an internal combustion engine for actuating a fuel injector, the high pressure oil circuit comprising:

• an ICP sensor;
• an IPR valve;
• at least one high pressure oil reservoir;
• a high pressure pump housing comprising a high pressure pump cover and a high pressure pump mounting in a rear top crank case area;
• a high pressure pump disposed in the high pressure pump housing and operatively connected to an integrated low pressure oil reservoir;
• an internally disposed high pressure oil line operatively connected to the high pressure pump and the at least one high pressure oil reservoir;
• wherein a controller selectively modifies pressure in the high pressure oil circuit via selective actuation of the IPR valve to obtain a desired pressure in the high pressure oil circuit.

An integrated tow pressure oil reservoir for use in a hydraulically-operated electronically controlled fuel Injector system for an internal combustion engine for actuating a fuel injector, the oil reservoir comprising:

• a low pressure oil cooler;
• a low pressure oil housing in a front top crank case area;
• a high pressure pump filter;
• and
• a high pressure pump feed passage.

A hydraulically-operated electronically controlled unit fuel injector system for an internal combustion engine having at least one fuel injector, a controller, an injection control pressure sensor, an injection pressure regulator valve, a high pressure check valve, and at least one high pressure oil reservoir, the improvement comprising:

• an integrated low pressure oil reservoir;
• a high pressure pump housing comprising a high pressure pump cover and a high pressure pump mounting in a rear top crank case area;
• a high pressure pump disposed in the high pressure pump housing and operatively connected to the integrated low pressure oil reservoir;
• an internally disposed high pressure oil line operatively connected to the high pressure pump and the at least one high pressure oil reservoir;
• wherein the controller selectively modifies pressure in the high pressure oil circuit via selective actuation of the IPR valve to obtain a desired pressure in the high pressure oil reservoir and thereby allow an actuated fuel injector to deliver fuel.