摘要:
An injection unit (9) for injection of a first fuel (f1) and a second fuel (f2) in a combustion space. The injection unit (9) receives the first fuel (f1) from a fuel source (7) at a high pressure, and a second fuel (f2) from a second fuel source (15) at a lower pressure, an actuator (29) initiates a process of injecting at least the second fuel (f2) in the combustion space, and an injection nozzle (36) injects at least the second fuel (f2) in the combustion space. The injection unit includes a pressure boosting device (40) for increasing the pressure of the second fuel (f2) higher than the pressure in the second fuel source (15) by means of the pressure of the first fuel (f1), before the second fuel is injected.
摘要:
The present invention is directed to a dual fuel system and a dual fuel system assembly where liquid LPG and diesel are mixed and then distributed via the common rail to the combustion chambers. The liquid fuel mixture remains in a liquid state and under pressure for introduction to the combustion chambers. With the preferred embodiment of the dual fuel system, only minor changes are required to the diesel engine without altering the manufactures specifications and voiding the manufacturer's warranties. The resultant combustion of the liquid fuel mixture provides a cleaner emission and relatively cheaper vehicle operational costs.
摘要:
Bei einer Verbrennungskraftmaschine, die mittels eines Einspritzsystems (1) mit konventionellem Brennstoff und einer diesen teilweise ersetzenden Orimulsion beaufschlagbar ist, lassen sich dadurch der Kontakt der Orimulsion mit den Komponenten des Einspritzsystems (1) und damit die Verschleißprobleme auf ein Minimum reduzieren, dass die Druckquelle (3) für konventionellen Brennstoff über zwei parallele, mit gegenläufigen Rückschlagventilen (23, 24) versehene Strömungswege (20, 21) mit der Brennstoffleitung (16) verbunden ist, die einspritzdüsennah mit einer Orimulsionsleitung (17) verbunden ist, die mit einem in Vorlaufrichtung öffnenden Rückschlagventil (25) versehen ist und von einer im Takt der Verbrennungskraftmaschine aktivierbaren Druckquelle (7) für Orimulsion abgeht, deren Druck größer als der Öffnungsdruck des in der Orimulsionsleitung (17) angeordneten Rückschlagventils (25) sowie des in Rückströmrichtung öffnenden, der Druckquelle (3) für konventionellen Brennstoff zugeordneten Rückschlagventils (24) und kleiner als der Öffnungsdruck der Düsennadel (11) ist.
摘要:
An improved system and method for feeding fuel, which obviates the shortcomings of the fuel feeding system in the prior art, in which mixed fuel consisting of fine particles of solid fuel such as pulverized coal or the like and fuel oil, is directly sent under a pressure by means of a high-pressure pump but seizure of a pump plunger is caused, and which enables the fuel feeding system in the prior art to achieve good operations, are disclosed. A predetermined amount of fuel oil containing fine particles of solid fuel is fed into an oil reservoir (12) within an injection valve (9) through a control valve (16), and this fuel oil is injected through a nozzle hole (10) of the injection valve (9) with the aid of oil pressurized by means of a high-pressure pump (3). Thereby, only the above-mentioned fuel oil is injected, but the above-described pressurized oil is not injected, and also it never occurs that the aforementioned fuel oil enters the high-pressure pump (3), resulting in seizure of a plunger of the pump. The oil fed to the oil reservoir (12) is returned to an oil tank (1) via a circulation valve (21), and so, deterioration of the oil can be precluded. In addition, since the control valve (16) is regulated by a signal indicating a position of a control rack which controls a delivery amount of the high-pressure pump (3), fuel oil of the amount corresponding to the delivery amount of the high-pressure pump (3) is sent to the aforementioned oil reservoir (12), and so, only the above-mentioned fuel oil can be reliably injected.
摘要:
Pilot injection of a high cetane fuel (16) and main injection of a relatively lower cetane fuel (16a) is accomplished by providing dual fuel, rotary controlled, pilot and main injection apparatus. The apparatus has a first rotating valve (32) for starting and stopping pilot injection of the high cetane fuel (16) through a first nozzle (46) and for starting main injection of the lower cetane fuel (16a) through a second nozzle (46a), and a second rotating valve (32a) for stopping main injection of the lower cetane fuel (16a)
摘要:
The injection methods for diesel and DI Otto engines are currently exclusively based on a purely hydraulic jet atomisation, and in the DI Otto method there are the rudiments of an air-supported pre-chamber. In order to improve the atomisation quality, the system pressures are continuously increased, with the diesel injection occurring at over 2500 bar. This borders on mechanical and physical limits. The new solution consists of the supply of pressurised air or other gaseous substances into an air/gas groove (4), which is arranged in the nozzle body (1) or the apex (3) of the nozzle needle (2) directly at the combustion chamber-side end of the injection nozzle. The breaking up of the fuel molecules is effectively supported by the pressurised air, until it is possible to blow a continuous air flow through the nozzle holes (9). A pump unit formed by a fuel pump (20) and a pressurised air pump (21) is also associated with this solution.
摘要:
Disclosed are a fluid control system and method for controlling delivery of two variable pressure fluids to maintain a pressure bias between the two fluids within an end use device. The system employs an actively controlled vent valve which can be integrated into a fluid control module in preferred embodiments and is actuated to an open position to decrease fluid pressure in a first fluid supply line when a determined pressure differential reversal exceeds a predetermined threshold pressure differential reversal. The disclosed system is particularly useful in a high pressure direct injection (HPDI) multi-fueled engine system where the first fluid is a gaseous fuel and the second fluid is a liquid fuel. The fluid control system and method of controlling it provide for improved control of venting along with protecting system components from high back pressure and cross contamination of fluids.
摘要:
The fuel injection pump arrangement for a dual-fuel internal combustion engine comprises a pump body (1), at least one fuel chamber (10) that is arranged inside the pump body (1), at least one reciprocating plunger (2) that protrudes into the fuel chamber (10) for pressurizing liquid fuel in the chamber (10), a plunger moving mechanism (5, 11) for establishing mechanical connection between the plunger (2) and a rotating cam that drives the fuel injection pump, and means (4, 6, 7) for breaking the mechanical connection between the plunger (2) and the cam when the fuel injection pump is not used for pressurizing fuel. The invention also concerns a method for operating a dual-fuel engine.