Abstract: The combustion chamber of a high speed, two stroke or four stroke, internal combustion engine is provided with a generally homogeneous mixture of combustion air and two types of fuel, one having a high resistance to ignition (high octane), the other having a low resistance to ignition (high cetane), the fuels being supplied in a ratio which optimizes combustion for varying operating conditions. A high cetane fuel may also be injected into the combustion chamber to initiate the combustion in the form of rapidly propagating, multiple flame fronts. Moderate combustion pressures, rates of combustion pressure rise and low levels of combustion knock are generated. High compression pressures and little or no combustion air throttling are employed allowing high levels of thermal efficiency, fuel efficiency, output power and low levels of exhaust emissions. Low cost engine applications employ slightly lower compression pressures and an electrical spark to initiate combustion.

Abstract: Injectors 2 are connected to a common rail 4 via respective dispensing conduits 3. A mixture of a liquid fuel fed from a liquid fuel tank 2 and an additional fluid fed from an additional fluid tank 9 is formed, and is fed to the common rail 4. The additional fluid contained in the mixture is turned to its supercritical state, and the mixture is injected from the injectors 2 to the engine. The inlets of the dispensing conduits 3 are positioned, with respect to the common rail 4, to open out into a liquid fuel layer which will be formed in the common rail 4 when a separation of the mixture occurs.

Abstract: A novel dual-fuel system for an internal combustion engine is disclosed, that utilizes a single electrically triggerable metering device, in the form of a fuel injector, to supply two distinct fuels to an internal combustion engine, either alternatively or simultaneously.

Abstract: A fuel system for an internal combustion engine having a plurality of combustion chambers is disclosed. The fuel system includes a liquid fuel and a low pressurize gaseous fuel. The fuel system further includes a fuel tank, with the liquid fuel and the low pressurize gaseous fuel forming a fuel mixture in the fuel tank. A single fuel supply rail is fluidly connected to the fuel tank and a fuel injector fluidly connects the single fuel supply rail to each of the plurality of combustion chambers. The fuel mixture is provided to each fuel injector for injection into each respective combustion chamber. A method of operating the fuel system is also disclosed.

Abstract: A universal fuel injection system for liquid and gaseous fuels and mixes thereof the universal fuel injection system having a universal fuel injection module interposed between a liquid fuel injector nozzle the universal fuel injection module having a spring-biased gaseous fuel valve connected to a pressurized gaseous fuel source and to a conical poppet mixing valve in the fuel injector nozzle where liquid fuel from the liquid fuel actuator unit and gaseous fuel selectively admitted through the spring-biased gaseous fuel valve mix for discharge through a fuel nozzle discharge orifice.

Abstract: In a gas-supply system for supplying a generic engine of a vehicle type, comprising electronic control means for controlling delivery devices associated to various engines, said electronic control means are programmed for processing the data regarding the low-pressure part of the system according to a predetermined algorithm, at predefined instants, in order to enable timely detection of incorrect functioning of a solenoid valve set in a position corresponding to a pressure-reducing device set between the gas tank and a manifold for distribution of the gas to the delivery devices. The system is moreover able to detect possible gas leaks from the low-pressure part of the system.

Abstract: A gaseous and liquid fuel injection valve for an internal combustion engine comprises an injection valve body that houses two separate concentric fuel injection valve assemblies. The first valve assembly is a pilot fuel needle valve assembly, which comprises a first needle movable in the direction of the longitudinal axis of the body between an open and a closed position. The second valve assembly is a gaseous fuel needle valve assembly, which comprises a second needle movable in the direction of the longitudinal axis between an open and a closed position. The gaseous fuel needle valve assembly controls the injection of gaseous fuel into the combustion chamber through a plurality of gaseous fuel holes formed in a nozzle tip of the gaseous fuel needle valve assembly. At least one of the nozzle tips is rotatable to thereby change the position of the pilot fuel holes with respect to the gaseous fuel holes.

Abstract: In a fuel fractionation device for separating a low-boiling fuel fraction from a liquid fuel of an internal-combustion engine, including a vessel which contains the liquid fuel, and in which a reduced pressure is generated by withdrawing the low-boiling fuel fraction in vapor form from the vessel and making it available to the internal combustion engine, the efficiency of the fractionation is improved by utilizing a carrier-gas which is introduced into the liquid fuel, and which is withdrawn from the vessel together with the fuel fraction vapor.

Abstract: Method and system for processing an irregular gas flow which may contain a fuel. This gas flow is supplied to an internal-combustion engine, the fuel which may be present being utilized to good effect and the environment being exposed to the minimum possible pollution from hazardous substances. An auxiliary fuel is provided for any further support. According to the invention, a regulating arrangement is provided, by which the amount of auxiliary fuel can be controlled as a function of the operating conditions of the engine. Moreover, there is a regulating arrangement which is able to control the primary gas flow. The regulating arrangement is designed in such a manner that it is attempted to use as little auxiliary fuel as possible. In the most optimum scenario, no auxiliary fuel is used.

Abstract: An improved injection valve apparatus for variably controlling the injection of nitrous oxide and supplemental fuel into a combustion engine, and method for controlling and varying the amounts of nitrous oxide and supplemental fuel injected into a combustion engine based on existing engine conditions. The method comprises programming engine parameters for the timing and volume of nitrous oxide injected into an engine, continuously monitoring engine performance and engine conditions, and adjusting the amount of nitrous oxide injected and additional fuel supplied in response to changing engine conditions.

Abstract: A methane gas control system, including a blower having an inlet for generating an air stream and a discharge section for expelling the air stream from the blower, a fuel collector attached to the blower at the discharge section for collecting methane gas contained in the air stream, a heated dryer connected to the fuel collector for eliminating moisture from the methane gas, and an engine connected to the heated dryer that is at least partially fueled by the methane gas. In operation, the methane gas control system removes methane from a borehole by generating and collecting an air stream from the borehole using a blower, collecting methane contained in the air stream using a fuel collector, removing moisture from the methane using a heated dryer, and transporting the methane from the heated dryer to an engine that is at least partially fueled by the methane gas.

Abstract: An internal combustion engine adapted to use an environmentally clean multi-fuel composition, comprising acetylene as a primary fuel and a combustible fuel, such as one or more fluids selected from an alcohol such as ethanol, methanol or any other alcohol or alcohols from the group comprising C1-C12 carbon chains, ethers such as from the group comprising dimethyl ether, diethyl ether, methyl t-butyl ether, ethyl t-butyl ether, t-amyl methyl ether, di-isopropyl ether and the like, low-molecular-weight esters such as from the group comprising methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, ethyl malate, butyl malate, and the like, or other suitable combustible fluid such as mineral spirits and the like, as a secondary fuel for operatively preventing early ignition and knock arising from the primary fuel.

Abstract: A universal fuel injection system for liquid and gaseous fuels and mixes thereof the universal fuel injection system having a universal fuel injection module interposed between a liquid fuel injector nozzle the universal fuel injection module having a spring-biased gaseous fuel valve connected to a pressurized gaseous fuel source and to a conical poppet mixing valve in the fuel injector nozzle where liquid fuel from the liquid fuel actuator unit and gaseous fuel selectively admitted through the spring-biased gaseous fuel valve mix for discharge through a fuel nozzle discharge orifice.

Abstract: In an internal-combustion engine designed to operate selectively with gasoline or gas, after each switching of fuel the injectors of the fuel-supply system that has been activated are controlled differently with respect to operation at the normal engine running rate to compensate for the transient phenomena due to the change of fuel.

Abstract: A fuel delivery system which selectively controls two pressure sources to deliver fuel from a tank to the engine for consumption by the engine. The fuel system has a pair of fuel supply passages through which fuel is discharged from the fuel tank to a main fuel supply line for delivery to the engine. One fuel passage communicates with an outlet of an electric fuel pump disposed within the fuel tank. The second fuel passage permits fuel to flow out of the fuel tank into the main fuel supply line independently of the fuel pump within the tank. Preferably, a valve is disposed in the second fuel passage to selectively permit fuel flow through the second fuel passage. The fuel system also has a controller which selectively provides electric power to the fuel pump so that the fuel pump in the fuel tank operates only when it is needed to discharge fuel from the tank.

Abstract: A conversion system for converting a spark ignition engine to operate on gaseous fuel is disclosed. The conversion system includes an electronic controller which operates on several novel principles to provide superior performance/responsiveness and to reduce exhaust emissions. The controller in accordance with the invention assumes complete control of spark ignition timing when gaseous fuel mode is enabled and generates independent spark ignition signals tailored to the gaseous fuel. The controller also generates an independent pulse width modulated gaseous fuel injection signal that controls a high performance electronic solenoid injector valve to supply gaseous fuel to the engine. Variable injector speed is used to compensate for the dynamic range of the engine. A novel dual array block learn scheme is used to provide efficient fuel control in engines equipped with closed-loop monitoring systems and exhaust gas recirculation.

Abstract: A gaseous fuel adaptor for modifying an internal combustion engine having a liquid fuel carburetor. The carburetor has an air intake for receiving air to mix with a liquid fuel. The adaptor includes a body mounted over the carburetor air intake and a passageway having an inlet and an outlet formed in the body. Air enters the passageway through the inlet and air exits the passageway through the outlet into the carburetor air intake. A gaseous fuel feed port disposed between the passageway inlet and outlet feeds gaseous fuel into the passageway, and a butterfly valve disposed in the passageway between the gaseous fuel feed port and the passageway inlet meters air entering the passageway to mix with the gaseous fuel.

Abstract: An electronic pressure reducer for liquid petroleum gasses comprises a heat exchanger (2,3) located upstream of an evaporation chamber (4) connected to a pressure reducing valve (5); the chambers (13,14) of the reducing valve (5) are separated by a passage section (15) for the fuel in the state of superheated vapor; the area of the passage section (15) is changed by a conic closing device (16) manoeuvred by a step motor (17) controlled by the central unit (6); the control central unit (6) defines the displacement of the conic closing device (16) from a first position of maximum flow to a second position of minimum flow by changing the area of the passage section (15), the dimension of which defines the flow and the pressure of the fuel coming out of the reducing valve (5) through an outlet orifice (18) connected to a metering valve (10).

Abstract: A system and assembly for modifying a diesel powered electric generator preferably of the reciprocating engine type to the extent that the generator is capable of running on either 100% diesel fuel or in a “bi-fuel” mode which is defined as a mixture of methane based gas and diesel fuel. The system and associated assembly is specifically designed to provide for the automatic or manual switching between the full diesel mode and the gas-diesel fuel or bi-fuel mode for continuous generator operation without interruption in generator output and at substantially equivalent or comparable efficiency levels.

Abstract: A fill block is provided for a CNG fuel system for a transit bus or similar vehicle. The fill block includes a integral one piece body having first and second ends defining a length therebetween. The body has a main bore defined therein. A ball valve is received in the body and has a handle extending from the body. The ball valve is movable between open and closed positions, wherein the main bore is opened and closed, respectively. A fueling port is defined in the body and communicated with the main bore. A defueling port is defined in the body and communicated with the main bore. A fueling receptacle is connected to the fueling port. A defueling receptacle is connected to the defueling port. A defueling valve is provided for selectively communicating the defueling port with the main bore or isolating the defueling port from the main bore.

Abstract: A fuel control system is provided including a fuel tank, a purge vapor canister, a vapor line, and a fuel injector connected to an internal combustion engine. A purge vapor canister vent valve seals the purge vapor canister from the atmosphere such that the fuel tank, purge vapor canister, and fuel injector form a closed system. Upon initial starting of the engine, the purge vapor pressure is such that the purge vapor is drawn to the fuel injector from the dome portion of the fuel tank after passing through the purge vapor canister. Simultaneously therewith, the amount of liquid fuel is reducing or increasing by an amount of equally increasing or decreasing, respectively, vapor fuel so that a necessary mass flow rate is achieved to support combustion. As the amount of fuel vapors decreases to a negligible amount, combustion is supported by the atomization of liquid fuel.

Abstract: A premixed charge compression ignition engine, and a control system, is provided which effectively initiates combustion by compression ignition and maintains stable combustion while achieving extremely low nitrous oxide emissions, good overall efficiency and acceptable combustion noise and cylinder pressures. The present engine and control system effectively controls the combustion history, that is, the time at which combustion occurs, the rate of combustion, the duration of combustion and/or the completeness of combustion, by controlling the operation of certain control variables providing temperature control, pressure control, control of the mixture's autoignition properties and equivalence ratio control. The combustion control system provides active feedback control of the combustion event and includes a sensor, e.g. pressure sensor, for detecting an engine operating condition indicative of the combustion history, e.g.

Abstract: A pressurized fuel tank maintains fuel in its liquid phase and is connected to a fuel pump providing fuel to an accumulator. Control valves control fuel flow to injectors feeding fuel to combustion cylinders. When the engine is shut down, one way check valves connected between the control valves and the injectors close to seal the injectors from the control valves; and at the same time, a dump valve opens to connect the injectors to an adsorber device while an air inlet valve also opens to connect the adsorber device to the engine air inlet. When the engine is restarted, the check valves open and the dump valve and air inlet valve close. Subsequently, a purge valve opens to connect the adsorber device to a source of purge air, while the air inlet valve opens simultaneously. A purge process then occurs, whereupon the purge valve and air inlet valve simultaneously close, and the engine operates with the dump valve, the air inlet valve and the purge valve in closed position until the engine shuts down again.

Abstract: A liquid gas engine includes at least one combustion chamber, in which a liquid gas/air mixture is introduced and ignited, the liquid gas engine having an injection device which injects liquid gas via an injection nozzle. The injection nozzle opens into the combustion chamber, so that the liquid gas is injected directly into the combustion chamber.The direct injection of the liquid gas achieves ideal combustion conditions, particularly since liquid gas evaporating in the combustion chamber induces cooling which is utilized particularly under a high load.The liquid gas engine is preferably provided with an injection device which is designed as an alternating piston pump and which works on the energy accumulation principle.

Abstract: This system uses the fuel tank not only to store fuel, but as a generator to create a raw overly rich air/fuel mixture through the use of a bubble pan in the bottom of the fuel tank. This raw air/fuel mixture is then measured by sensors linked to a computer and additional air or fuel may be added by computer demand. Thus the computer can completely regulate the air/fuel mixture at all times in an ever changing way to meet climatic, engine, and load conditions. This total control of the air/fuel mixture in flexible and ever changing way should result in optimum combustion, a clean burn, extreme economy, and maximum engine power. This then is a system of computer controlled mixture.

Abstract: A conversion system for converting a spark ignition engine to operate on gaseous fuel is disclosed. The conversion system includes an electronic controller which operates on several novel principles to provide superior performance/responsiveness and to reduce exhaust emissions. The controller in accordance with the invention assumes complete control of spark ignition timing when gaseous fuel mode is enabled and generates independent spark ignition signals tailored to the gaseous fuel. The controller also generates an independent pulse width modulated gaseous fuel injection signal that controls a high performance electronic solenoid injector valve to supply gaseous fuel to the engine. Variable injector speed is used to compensate for the dynamic range of the engine. A novel dual array block learn scheme is used to provide efficient fuel control in engines equipped with closed-loop monitoring systems and exhaust gas recirculation.

Abstract: A supplemental fuel regulator for diesel engines, and a system for adding supplemental fuel to diesel engines is provided. The fuel regulator has two chambers, one which receives fuel from the fuel tank through a fuel inlet valve, which also reduces the pressure of the fuel. The fuel at much reduced pressure is passed to a second chamber through a fuel control valve. Fuel is drawn from the second chamber into an outlet duct, directly into the airflow duct of the diesel engine. A vacuum line from the engine pulls fuel from the second chamber. As engine demand increases, the engine vacuum increases, and additional fuel is supplied by the regulator. A solenoid switch provides control over the system, which can be activated by a user when the supplemental fuel system is deemed desirable. The solenoid switch can be configured to shut off the supplemental fuel system whenever the diesel engine is shut off.

Abstract: A fuel control system for delivering gaseous fuel from a source through an air/fuel mixture to a gas-operated engine that includes at least one sensor for operative coupling to the engine to provide at least one electronic sensor signal responsive to engine operating conditions. An electronic control unit is responsive to the sensor signal(s) for providing a fuel control signal indicative of a desired quantity of fuel to be delivered to the engine. A pressure regulator, for disposition between the fuel source and the fuel/air mixture, is responsive to the fuel control signal for controlling delivery of gaseous fuel to the mixer. The pressure regulator includes a housing having an inlet for connection to the fuel source and an outlet for connection to the mixer. A valve is disposed within the housing and biased toward closure by a primary pressure regulating spring for controlling flow of fuel from the inlet to the outlet.

Abstract: A method for transitioning between a first operating mode of a dual fuel engine and a second operating mode of the dual fuel engine includes establishing a final liquid fuel amount desired to be delivered to the engine upon completion of the transition to the second operating mode. Delivery of liquid fuel to the engine is adjusted by a first amount and, correspondingly, delivery of gaseous fuel to the engine is adjusted by a second amount, where an energy content of the first amount of liquid fuel is substantially the same as an energy content of the second amount of gaseous fuel. A determination is made as to whether liquid fuel is being delivered to the engine in an amount which is substantially the same as the desired final liquid amount previously established.

Abstract: An internal combustion engine of the Diesel type has an injection system with injectors which at high pressure injects compressed liquid gas into the combustion chambers of the cylinders. The liquid gas may be produced from volatile organic compounds evaporated from crude oil tanks. The engine can be a high-compression engine with a compression ration of at least 1:14, and the liquid gas can have a methane number of less than 10.

Abstract: A method for adjusting a fuel control system of an internal combustion engine to account for variations in the energy content of a fuel delivered to the engine involves monitoring the O.sub.2 level of the engine exhaust gases. The fuel may be a gaseous fuel for example. The fuel control system utilizes a stored gaseous fuel energy content value (E.sub.G) to determine the necessary duration of a gaseous fuel admission valve control signal. The method includes sensing an actual engine exhaust gas O.sub.2 level and comparing the actual exhaust gas O.sub.2 level with a desired exhaust gas O.sub.2 level. The stored gaseous fuel energy content value (E.sub.G) is adjusted based upon the comparison. The desired exhaust gas O.sub.2 level may be determined as a function of one or more engine operating parameters which indicate a desired or expected air/fuel ratio, the level of O.sub.2 in the exhaust gases being an indicator of the air/fuel ratio.

Abstract: A bi-fuel injection system includes a source of first liquid fuel; a source of second liquid fuel; at least one variable vapor pressure fuel injector; a common fuel rail for supplying first or second fuels to the fuel injector; a first valve structure in selective communication with the source of first or second fuels and in communication with an inlet of the fuel rail to selectively control supply of one of the first and second fuels to the fuel rail; and a second valve structure in communication with an outlet of the fuel rail and in selective communication with the source of first or second fuels to return fuel exiting the fuel rail to the source of first or second fuels. The second valve structure may be in selective communication with a vapor purge system to receive fuel vapors exiting the fuel rail.

Abstract: A mixture of gaseous fuel (natural gas or propane) and gasoline is used to fuel the internal combustion engine of a motor vehicle. The ratio of gaseous fuel to gasoline is preadjusted by the manual settings of an electronic processor which is used to change the gasoline fuel injection rate and the manual settings of an air/vacuum balance valve connected to a low pressure regulator and mixer are used to regulate the pressure of the gaseous fuel and mix it with air to provide the desired ratio. The fuel injection is also controlled in response to a signal fed to the processor which is in accordance with the output of the vehicle's exhaust oxygen sensors. The flow rate of gaseous fuel to the engine is controlled by means of a mixer which is preadjusted for a desired flow rate. This flow rate is automatically varied in response to the intake manifold pressure of the engine. This manifold pressure drives a valve which controls the gaseous fuel flow rate.

Abstract: A method for responding to detection of an open fault condition in a gaseous fuel admission valve for providing a flow of gaseous fuel to an affected combustion cylinder of an engine, the engine including at least one other gaseous fuel admission valve for providing a flow of gaseous fuel to at least one other combustion cylinder, a gaseous fuel shut off valve for controlling gaseous fuel flow from a source of gaseous fuel to a gaseous fuel manifold in communication with the gaseous fuel admission valve, and apparatus for causing ignition of a mixture of the gaseous fuel and air in each combustion cylinder.

Abstract: The present invention relates to an injection system for an internal combustion engine operated with liquefied petroleum gas and with a plurality of injection nozzles for the direct injection of fuel into the cylinders of the internal combustion engine, which injection system comprises the following:a fuel supply system in which fuel is held under a gas pressure;a high-pressure pump in order to make fuel available which stands under injection pressure;a high-pressure line which is connected with the high-pressure pump in order to supply the fuel being under injection pressure to the injection nozzles.A secure operation is achieved in such a way that a control line is provided further which can optionally be brought into connection with the injection nozzles, with fuel being present in the control line having a pressure which is higher than the gas pressure.

Abstract: A combined system and method is shown and described which uses a vaporous fuel mixture energy source comprised of air and a vaporous fuel as a source of fuel for an internal combustion engine. This mixture of air and vaporous fuel is injected into each one of a plurality of cylinders of an internal combustion engine. The air and vaporous fuel mixture is cooled prior to being injected into the internal combustion engine. In another embodiment, an electric generator is coupled to the internal combustion engine.

Abstract: A gas/air mixer for injecting gas into the intake air stream of an internal cumbustion engine using a combination of radial holes and radial tubes located around the perimeter of an air flow passage. The gas/air mixer includes an intake air passage which has a combination of radial holes and radial tubes arranged so that the gas is injected into the air stream. The gas passage contains gas which is at a higher pressure than the intake air. The gas flows around an annulus which distributes the gas to all the radial holes and radial tubes. The size of the intake air passage, the number and size of the radial holes, and the number, size and length of the radial tubes can be varied in any combination to achieve adequate gas/air mixing for the particular engine application. This combination can even include a device that contains all radial holes or all radial tubes. The distance that the gas is injected into the air stream is small at the radial holes and larger at the radial tubes.

Abstract: A standard diesel injection system and a mechanical direct-gas injection system are selectively operable, in combination with a continuous pilot injection system, to provide a combustion system that is capable of operating in either a conventional diesel mode or a dual-fuel mode. Operation between convention diesel or dual-fuel combustion modes is mechanically controlled by a two-position, four-way control valve. The mechanical direct-gas injection system is actuated by pulsed diesel fuel directed to the actuation chamber of a gas injector by the same injection pump used to provide diesel fuel to the combustion chamber during conventional diesel operation.

Abstract: A multipoint fuel delivery system for an internal combustion engine includes fuel metering device(s) such as fuel injector(s) associated for selectively controlled injection of the second fuel to corresponding combustion chamber(s) of the internal combustion engine. A fuel supply manifold associates with fuel injector(s) for directing the second fuel to each fuel injector. An intake port adaptor mechanism adapts the intake port of the associated combustion chamber to receive the selectively controlled injection of the fuel from an associated fuel injector. The intake port adaptor mechanism may also engage the intake port so as to permit selective flow of the first fuel or the second fuel to the intake port of the selected combustion chamber. A control mechanism selectively controls the flow of the second fuel through each injector(s).

Abstract: An engine assembly includes a plenum member having an inlet opening and an outlet opening defined therein. The engine assembly further includes an air source in fluid communication with the inlet opening. The engine assembly still further includes a fuel combustion assembly having an engine block having a piston cylinder defined therein, an engine head secured to the engine block and having an intake port defined therein, and a piston which translates within the piston cylinder. The piston, the piston cylinder, and the engine head cooperate so as to define a combustion chamber. The engine assembly further includes a gaseous fuel supply valve which controls the amount of gaseous fuel advanced from a gaseous fuel source to the first intake conduit. The engine assembly still further includes an intake conduit interposed between the outlet opening and the intake port.

Abstract: A fuel pressure relief system for a dual fuel engine including at least one gaseous fuel admission valve positioned between a gaseous fuel inlet region and an air intake region is provided. The system includes a first pressure sensor positioned in the gaseous fuel inlet region and a second pressure sensor positioned in the air intake region. An electronic controller is connected to the first pressure sensor and the second pressure sensor. A gaseous fuel vent path extends between the gaseous fuel inlet region and a portion of an air intake path of the engine. A vent valve is positioned along the gaseous fuel vent path and is connected to the electronic controller for control thereby. When the differential pressure across the gaseous fuel admission valve exceeds a predetermined level the fuel vent valve is opened to relieve the pressure.

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.

Abstract: A multipoint fuel delivery system for an internal combustion engine includes fuel metering device(s) such as fuel injector(s) associated for selectively controlled injection of the second fuel to corresponding combustion chamber(s) of the internal combustion engine. A fuel supply manifold associates with fuel injector(s) for directing the second fuel to each fuel injector. An intake port adaptor mechanism adapts the intake port of the associated combustion chamber to receive the selectively controlled injection of the fuel from an associated fuel injector. The intake port adaptor mechanism may also engage the intake port so as to permit selective flow of the first fuel or the second fuel to the intake port of the selected combustion chamber. A control mechanism selectively controls the flow of the second fuel through each injector(s).

Abstract: A system for storing, handling, and controlling the delivery of the gaseous fuel to internal combustion engine powered devices adapted to run simultaneously on both a liquid fuel and a gaseous fuel. The invention provides a control system having a float controlled solenoid for ensuring that a consistent supply of dry gas is delivered to the engine. The invention uses the sensors and computer of the existing electronic fuel delivery system of the device to adjust the amount of liquid fuel delivery to compensate for the amount of gaseous fuel injection. The invention provides a gaseous fuel control system for a dual fuel device which is integrated and compact, and which preferably includes a fuel fill connection for the gaseous fuel. The invention also provides a horizontal fuel reservoir comprised of end interconnected parallel conduits and, preferably, includes two separate compartments and a pressure relief system for permitting expansion into a relief compartment from a main compartment.

Abstract: A fuel supplying device for an engine comprises a carburetor (1) having a mixing body (2) in which a venturi passage (3) is provided, a float chamber (4) being arranged in the mixing body (2), a liquid fuel nozzle (5) communicating with the float chamber (4), a liquid fuel nozzle outlet (6) facing the venturi passage (3). The mixing body (2) is provided with a gaseous fuel nozzle (7). The liquid fuel nozzle outlet (6) and a gaseous fuel nozzle outlet (8) are faced to the same venturi passage (3) so as to be able to supply the alternative of a liquid fuel or a gaseous fuel.

Abstract: An auxiliary injector arrangement in a fuel supply system for an internal combustion engine. The auxiliary injector arrangement includes at least one injector mounted in the inlet manifold upstream or downstream of the throttle and adapted to supply fuel at times when the main fuel supply system cannot supply sufficient fuel. The main fuel supply system and the auxiliary injector may be operated on LPG, natural gas or petrol. The auxiliary injector may be a liquid fuel injector or gaseous fuel injector.

Abstract: An apparatus for operating an internal combustion engine, in particular for driving a motor vehicle, alternatingly with two different types of fuel, includes two separate fuel circuits each being associated with a respective one of first and second different types of fuel. Each of the fuel circuits has at least one electrically triggerable metering device in the form of an injection valve. A switch device switches over from one of the fuel circuits to the other of the fuel circuits. A single electronic control unit controls both operation of the engine with the first type of fuel and operation of the engine with the second type of fuel. The electronic control has a power portion with end stages for triggering the injection valves. Each of the end stages is assigned both one injection valve for the first fuel type and one injection valve for the second fuel type.

Abstract: A twin-piston engine (1), i.e., a crankcase scavenged two-stroke internal combustion engine comprising two pistons (2,3) travelling in essentially the same direction, and wherein one (4) of the cylinder bores, the exhaust bore (4), contains all exhaust ports (6), and the other cylinder bore (5), the scavenging cylinder bore, contains a number of scavenging ports (7,8,9).

Abstract: A multipoint fuel delivery system for an internal combustion engine includes fuel metering device(s) such as fuel injector(s) associated for selectively controlled injection of the second fuel to corresponding combustion chamber(s) of the internal combustion engine. A fuel supply manifold associates with fuel injector(s) for directing the second fuel to each fuel injector. An intake port adaptor mechanism adapts the intake port of the associated combustion chamber to receive the selectively controlled injection of the fuel from an associated fuel injector. The intake port adaptor mechanism may also engage the intake port so as to permit selective flow of the first fuel or the second fuel to the intake port of the selected combustion chamber. A control mechanism selectively controls the flow of the second fuel through each injector(s).

Abstract: The delivery system of the invention consists of a pair of LNG fuel tanks mounted on a vehicle. A solenoid valve associated with each tank allows the vehicle operator to select the tank from which LNG is to be delivered to the engine. An automatic override system is provided whereby if the pressure in the non-selected tank rises above a predetermined level, the operator's tank selection is overridden and gas from the non-selected tank is used until the pressure falls below the predetermined level. This override system eliminates the need to vent gas to the atmosphere to avoid pressure building up and thereby eliminates waste of the LNG. Each tank is also provided with a pressure building capability such that the gas will always be delivered to the engine with sufficient pressure. The system is designed such that LNG from a stationary low pressure storage tank can be delivered at high pressure to refuel the tanks.