FUEL INJECTION SYSTEM WITH PRESSURE-CONTROLLED BLEED FUNCTION

• US 20130213357A1
• Filed: 06/15/2011
• Published: 08/22/2013
• Est. Priority Date: 07/14/2010
• Status: Active Grant

• Current Assignee: Volvo Lastvagnar AB (Volvo AB)
• Original Assignee: Volvo Lastvagnar AB (Volvo AB)
• Inventors: Yudanov, Sergi
• Granted Patent: US 9,541,045 B2
• Time in Patent Office: Days
• US Class Current: 123/445
• CPC Class Codes: F02M 21/0245 High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
• CPC Class Codes: F02M 37/0029 Pressure regulator in the low pressure fuel system pressure regulator in low-pressure injection apparatus F02M69/54
• CPC Class Codes: F02M 37/0052 Details on the fuel return circuit; Arrangement of pressure regulators
• CPC Class Codes: F02M 47/00 Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure fuel- injectors actuated by the pressure in engine working cylinders F02M49/00
• CPC Class Codes: F02M 59/34 by throttling of passages to pumping elements or of overflow passages , e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
• CPC Class Codes: F02M 63/0052 with means for adjusting the opening pressure, e.g. electrically controlled
• CPC Class Codes: F02M 63/02 Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

A fuel injection system with a high-pressure fuel injection pomp is provided for pressurizing fuel and delivering it for injection into an internal combustion engine. The system and the high-pressure fuel injection pump have an inlet, a return port, at least one plunger, a suction, channel positioned between the inlet and plunger, and a bleed valve connectively arranged at the suction channel of the high-pressure fuel injection pump, A selector valve is provided between the inlet, and return port.

Claims

1. A high-pressure fuel injection system for pressurizing fuel and delivering it for injection into an internal combustion engine, the system comprising a high-pressure fuel injection pump with an inlet, at least one plunger, a suction channel positioned between the inlet and plunger, the system further comprising a return port, and a bleed valve connectively arranged at the suction channel of the high-pressure fuel injection pump, wherein a selector valve is provided between the inlet and return port.

2. A fuel injection system according to claim 1, wherein the bleed valve is connectively arranged between the suction channel and the return port.

3. A fuel injection system according to claim 1, wherein the selector valve is able to control hydraulic flow restriction between the inlet and return port.

4. A fuel injection system according to claim 1, wherein the selector valve is able to open or close the hydraulic connection between the inlet and return port.

5. A fuel injection system according to claim 1, wherein the selector valve is controlled by pressure developed by the plunger.

6. A fuel injection system according to claim 5, wherein the selector valve is fully closed when, the pressure developed by the plunger is below a predetermined level, and is partially or fully open when the pressure is at or above the predetermined level.

7. A fuel injection system according to claim 1, wherein the selector valve is electronically controlled.

8. A fuel injection system according to claim 1, wherein the bleed valve is controlled by pressure developed by the plunger.

9. A fuel injection system according to claim 1, wherein the bleed valve is fully open when the pressure developed by the plunger is below a predetermined level and is partially or fully closed when the pressure is at or above the predetermined level.

10. A fuel injection system according to claim 1, wherein the bleed valve is electronically controlled.

12. A fuel injection system according to claim 1, wherein an hydraulic flow restrictor is installed between the inlet and return port.

13. A fuel injection system according to claim 1, wherein an hydraulic flow restrictor is installed downstream of the return port.

14. A fuel injection system according to claim 1, wherein an inlet metering valve is connectively arranged between said the inlet and the suction channel.

11. A fuel injection system according to, wherein the bleed valve is a non-return valve connected by its inlet to the suction channel.