Fuel system and corresponding method
AssigneeVolvo Lastvagnar AB
InventorSergi Yudanov
Life of this patent
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Abstract
A fuel system includes a low pressure fuel system, a high-pressure fuel pump, a common rail, at least one fuel injector, and an engine management system. The engine management system may initiate a recirculating cooling fuel flow through the high-pressure fuel pump for avoiding fuel boiling by either increasing the target pressure of the fuel within the common rail above a threshold level, which triggers opening a high-pressure fuel relief valve, such that fuel supplied by the high-pressure fuel pump is returned to the low pressure fuel system via the high-pressure fuel relief valve, or providing increased internal fuel leakage within the at least one fuel injector, such that fuel supplied by the high-pressure fuel pump is returned to the low pressure fuel system by a return line.
Claims14
Fuel system for supplying pressurised low viscosity fuel to an internal combustion engine, the fuel system comprising a low pressure fuel system, a high-pressure fuel pump, a common rail, at least one fuel injector, and an engine management system, the high-pressure fuel pump is arranged to supply pressurised fuel to the common rail, and the common rail is arranged to supply high-pressure fuel to the at least one fuel injector, which is configured to inject high-pressure fuel into a combustion chamber of the combustion engine, wherein the engine management system is arranged to initiate a recirculating cooling fuel flow through at least the high-pressure fuel pump for avoiding fuel boiling by means of either increasing the target pressure of the fuel within the common rail above a threshold level, which triggers opening a high-pressure fuel relief valve that is arranged, downstream of the high-pressure fuel pump, such that at least part of the fuel supplied by the high-pressure fuel pump is returned to the low pressure fuel system via the high-pressure fuel relief valve, or
- providing increased internal fuel leakage within the at least one fuel injector, such that at least part of the fuel supplied by the high-pressure fuel pump is returned to the low pressure fuel system by a return line.
Method for providing a recirculating cooling fuel flow through at least a high-pressure fuel pump, wherein the high pressure fuel pump is part of a fuel system that is configured to supply pressurised low viscosity fuel, in particular dimethyl ether (DME) or a blend thereof, to an internal combustion engine, in particular a compression ignition engine, the fuel system comprising a low pressure fuel system, a high-pressure fuel pump, a common rail, at least one fuel injector, and an engine management system, wherein the high-pressure fuel pump is arranged to supply pressurised fuel to the common rail, and wherein the common rail is arranged to supply high-pressure fuel to the at least one fuel injector, which is configured to inject high-pressure fuel into a combustion chamber of the combustion engine, the method comprising:
- initiating a recirculating cooling fuel flow through at least the high-pressure fuel pump for avoiding fuel boiling by means of either
- increasing the target pressure of the fuel within the common rail above a threshold level that triggers opening a high-pressure fuel relief valve that is arranged downstream of the high-pressure fuel pump, such that at least part of the fuel supplied by the high-pressure fuel pump is returned to the low pressure fuel system via the high-pressure fuel relief valve, or
- providing increased internal fuel leakage within the at least one fuel injector, such that at least part of the fuel supplied by the high-pressure fuel pump is returned to the low pressure fuel system by a return line.
Dependencies are inferred from the claim text.