Abstract:
A method of operating a dual fuel internal combustion engine of the diesel-type, comprising a combustion chamber being at least partly delimited by a piston, a first fuel supply for a first fuel, said first fuel supply being located in or at the combustion chamber and/or in or at an inlet port thereof, and a second fuel supply for a second fuel, the method comprising the steps of: • pre-mixing said first fuel in said combustion chamber and/or in said inlet port, • compressing the charge containing the first fuel to conditions that allow auto- ignition of the second fuel • performing a first injection of the second fuel into said combustion chamber to initiate auto-ignition of said second fuel for igniting said first fuel, thereby initiating conditions for pre-mixed flame propagation combustion of the first fuel, further comprising the step of • performing at least one subsequent injection, said subsequent injection supplying additional kinetic energy into the combustion process to thereby enhance turbulence intensity and propagation speed of said flame and/or enhance late mixing in the combustion chamber, so a to improve late oxidation during combustion. The invention also relates to a dual fuel combustion engine of the diesel engine type.
Abstract:
The present invention relates to a method of selecting between two operation modes in a dual fuel internal combustion engine of the diesel-type, comprising a combustion chamber being at least partly delimited by a piston, a first fuel supply for a first fuel, said first fuel supply being located in or at the combustion chamber and/or in or at an inlet port thereof, and a second fuel supply for a second fuel, - the engine having two different operation modes, both operation modes comprising the steps of: - pre-mixing said first fuel in said combustion chamber and/or in said inlet port, - compressing the charge containing the first fuel to conditions that allow auto-ignition of the second fuel, - performing a first injection of the second fuel into said combustion chamber to initiate auto-ignition of said second fuel, thereby initiating conditions for combustion of the fuel remaining in the combustion chamber after auto-ignition of the second fuel, wherein - said first operation mode is distinguished by homogeneous ignition and combustion of the remaining fuel, - said second operation mode is distinguished by pre-mixed flame propagation combustion of the remaining fuel, said method further comprising the step of: - adjusting the amount of the second fuel injected in said first injection of the second fuel, and/or the timing of said first injection of the second fuel, so as to control the combustion chamber temperature and pressure after auto-ignition of the second fuel such that selection between said first and second operation modes is achieved. The invention also relates to a dual fuel internal combustion engine of the diesel-type.
Abstract:
A method and device for powering a diesel engine (1) with dual fuel feed, namely diesel fuel and gas, in particular gasoil and methane, said engine (1) comprising a plurality of diesel electro-injectors (2) for feeding the gasoil into corresponding cylinders, and activated and controlled by an electronic control unit (4) which supervises their operativity on the basis of predefined control parameters, gasoil injection taking place in accordance with a modality which comprises at least one pilot injection (P1; P2) followed by a main injection (I) into the corresponding cylinder; it is provided that the gasoil quantity fed into the cylinder is reduced, at least during the main injection (I), the lacking gasoil quantity being replaced with a gas quantity enabling the engine to operate normally, said electric signal being fed to the electronic control unit (4) to mask said reduction in injected gasoil (I).
Abstract:
A method for controlling the supply of a first fuel and a second fuel to an engine, which engine is fuelled by the first fuel only in a first mode of operation and by a mixture of the first fuel and the second fuel in a second mode of operation, the method comprising the steps of: 1) calculating the mass of first fuel Md required by the engine if running in the first mode; 2) calculating from the mass Md, the fuel energy Fe that the amount of mass Md would provide; 3) determining a minimum reduced amount of diesel fuel Fdmin with which it is desired to operate in the second mode; 4) calculating the amount of second fuel Msub, which together with the reduced amount of diesel fuel Fdmin will provide a fuel energy equivalent to Fe.
Abstract:
Die Erfindung bezieht sich auf eine Brennstoffzumesseinrichtung (1) für insbesondere eine selbstzündende, luftverdichtende Brennkraftmaschine mit einer ersten Kraftstoffpumpe (5) zur Förderung eines ersten Kraftstoffes wie einen Dieselkraftstoff sowie mit einer zweiten Kraftstoffpumpe (4) zur Zuführung eines zweiten Kraftstoffes, insbesondere eines Liquified-Petroleum-Gas (LPG)-Kraftstoffes, wobei der erste Kraftstoff und der zweite Kraftstoff jeweils einem Tank (2, 3) entnehmbar und einem Druckmischbehälter (11) aufgebbar sind, wobei aus dem Druckmischbehälter (11) ein Mischkraftstoff über eine Hochdruckpumpe (8) dem Einspritzsystem (15) der Brennkraftmaschine zuführbar ist, und wobei das Einspritzsystem (15) eine von einem Druck- und Bypassventil gesteuerte Rückführleitung (10) aufweist, über die im Einspritzsystem (15) überschüssiger Mischkraftstoff dem Druckmischbehälter (11) zuführbar ist. Um eine Brennstoffzumesseinrichtung mit verminderten Betriebsrisiken geschaffen zu haben, zeichnet sich diese dadurch aus, dass der Druckmischbehälter (11) einen Dampfdruckpufferraum (12) aufweist, der an eine Dampfrückführleitung anschließbar ist, die in den Dampfdruckraum (2.1) des Tanks (2) des zweiten Kraftstoffes mündet.
Abstract:
A gaseous fuel engine including an exhaust gas recirculation system (28) and method for operating a gaseous fuel engine are provided. The exhaust gas recirculation system (28) has an adjustable flow and is operable to supply exhaust gas to at least one engine cylinder. The engine further includes means for determining a value indicative of a charge density of a combustion mixture that includes gaseous fuel, air and exhaust gas supplied to the at least one cylinder, and adjusting a flow quantity through the exhaust gas recirculation system (28) based at least in part on the value.
Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer mit gasförmigem Kraftstoff betriebenen Brennkraftmaschine, wobei zumindest in einem Motorbetriebsbereich die Verbrennung des in einen Hauptbrennraum (5) eingebrachten Brenngas/Luftgemisches durch Entzündung eines zündfähigen Kraftstoff/Luftgemisches in einer Vorkammer (6) eingeleitet wird, wobei in der Vorkammer ein Kraftstoff/Luftgemisch erzeugt wird, welches gegen Ende des Kompressionstaktes durch einen Selbstzündungsvorgang eines flüssigen Kraftstoffes verbrennt. Um den Wirkungsgrad zu erhöhen und die Emissionen zu reduzieren, ist vorgesehen, dass während eines Arbeitszyklus mehrmals flüssiger Kraftstoff in die Vorkammer (6) eingespritzt wird.
Abstract:
A method for responding to detection of an open fault condition in a gaseous fuel admission valve (30) for providing a flow of gaseous fuel to affected combustion cylinder (14) of an engine (12), the engine (12) including at least one other gaseous fuel admission valve (30) for providing a flow of gaseous fuel to at least one other combustion cylinder (14), a gaseous fuel shut off valve (38) for controlling gaseous fuel flow from a source of gaseous fuel to a gaseous fuel manifold (32) in communication with the gaseous fuel admission valve (30), and apparatus for causing ignition of a mixture of the gaseous fuel and air in each combustion cylinder (14). The present method involves the steps of closing the gaseous fuel shut off valve (38); disabling the ignition of the mixture of gaseous fuel and air in the affected combustion cylinder (14); and continuing operation of the at least one other gaseous fuel admission valve (30) to allow flow of remaining gaseous fuel in the gaseous fuel manifold (32) through the at least one other gaseous fuel admission valve (30) into the at least out other combustion cylinder (14) of the engine (12) where the gaseous fuel can be combusted. In the instance of an engine (12) operating in a dual fuel mode, at a suitable point, operation can be shifted to a liquid fuel mode. In the instance of an engine (12) that operates solely on gaseous fuel, once the gaseous fuel remaining in the gaseous fuel manifold (32) is exhausted, the engine (12) will come to rest.
Abstract:
In one embodiment of the present invention an apparatus (30) for controlling one or more engines (32) by synchronizing the functions of two or more electronic control modules (70, 72, 74) includes a master electronic control module (70), one or more slave electronic control modules (72, 74), and one or more data links (76, 106) for transferring data between the electronic control modules (70, 72, 74). Engine control and monitoring functions are divided between the master electronic control module (70) and the slave electronic control modules (72, 74). The present invention may be used to control and monitor dual fuel engines (32) and engines that operate on one type of fuel. The master electronic control module (70) may transition operation of the engine (32) to the diesel fuel only mode in the event of a failure of any dual fuel mode specific components. The master ECM (70) coordinates timing and speed of fuel injection to engine cylinders (34, 35) using input from an adjustable engine speed command device and a speed sensor connected to each engine (32). The loads driven by the engines (32) may be allocated evenly or unevenly.
Abstract:
A dual fuel compression ignition engine (10) comprises a gas fuel supply system (20-25) for the engine (10), and a diesel fuel supply system (12-16) for the engine, including an injection pump (11) having a governor and a control member to control the amount of diesel fuel injected into the engine by the pump (11), and means (13') to arrest movement of the control member (11a) in the direction to increase the supply of diesel fuel to the engine, at a position to supply pilot fuel at a constant, or substantially constant, rate, the position for arrest being determined in accordance with at least one operating condition of the engine, such as the engine speed. Another embodiment shows a present rail system. In both, the amount of pilot diesel fuel is adjusted by a feed-back signal indicative of the amount of pilot fuel injected.