Injection system for an internal combustion engine
AssigneeAVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List
InventorsHerwig Ofner, Peter Herzog
Life of this patent
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Abstract
To provide an injection system for an internal combustion engine operating on self-igniting liquefied gas as a fuel, and to minimize cavitation and related problems of fuel delivery as well as wear, the fuel tank is configured as a low-pressure storage tank which is connected to a pressure control unit that includes a fuel pumping unit for drawing fuel from the storage tank and delivering the fuel to the suction line of the fuel delivery device and a pressure release line which branches off the suction line and leads back to the storage tank, the pressure release line including a release valve for maintaining a constant interior pressure in the suction line above the vapor pressure of the liquefied gas. The injection system is configured as a leakage-free system.
Claims9
Injection system for an internal combustion engine operating on self-igniting liquefied gas as a fuel, comprising an injection unit per cylinder for direct injection of the fuel comprising self-igniting liquefied gas into a combustion chamber, a fuel tank containing storage fuel, a fuel delivery device having a suction line and a pressure line for delivering said fuel coming from said fuel tank to said injection unit, said fuel tank being a low-pressure storage tank, wherein a pressure control unit is connected to said suction line for maintaining a constant residual pressure within said suction line at a level above the vapor pressure of said liquefied gas, said pressure control unit including a fuel pumping unit for drawing fuel from said storage tank and delivering said fuel to said suction line of said fuel delivery device, and wherein the injection system is leakage-free, and wherein said pressure control unit further includes a pressure release line leading back to the storage tank which branches off from said suction line, said pressure release line including a release valve for maintaining a constant interior pressure within said suction line.
Dependencies are inferred from the claim text.