Abstract: A method and apparatus are provided for supplying liquid gas as fuel to an internal combustion engine. From the liquid gas stream that is supplied to at least one liquid gas injection valve of the internal combustion engine, a portion is branched off and expanded. The liquid gas stream supplied to the internal combustion engine is cooled with coldness that results during the expansion, thus ensuring that the liquid gas stream supplied to the liquid gas injection valve is at least substantially liquid. The expanded liquid gas is supplied in a vaporous state to the internal combustion engine.

Abstract: A liquified gas delivery system for a motorized platform includes a holding tank configured to receive liquified gas. A first conduit extends from a vapor holding portion of the tank to a valve device. A second conduit extends from a liquid holding portion of the tank to the valve device. Fluid coupled to the valve device is a vaporizer which is in communication with an engine. The valve device selectively withdraws either liquified gas or liquified gas vapor from the tank depending on the pressure within the vapor holding portion of the tank. Various configurations of the delivery system can be utilized for pressurizing the tank during operation.

Abstract: In a fuel gas mixer 1 including a throttle valve 4 provided in an air intake passage 2 connected to an engine for opening and closing the air intake passage 2 and a fuel gas supply passage 6 connected to the air intake passage 2 upstream of the throttle valve 4. A fuel gas control valve 5 is provided in the air intake passage 2 upstream of the connecting part of the fuel gas supply passage 6 for opening and closing the air intake passage 2, and a fuel gas control value controlling means 11 is provided for varying the degree of the opening of the fuel gas control value 5 depending upon the operating state of the engine.

Abstract: A starting method of an LPI engine in a partial cool-down state wherein an engine is allowed to start with ample fuel pressure obtained in a fuel line when an LPI engine is in a partial cool-down state, thereby enabling the engine to start smoothly, and a fuel pump is driven at a maximum speed for a prescribed period of time within the scope of not generating noise even after starting of the engine has been performed, thereby enabling a stable engine operation.

Abstract: A scooter powered by a hydrogen powered internal combustion engine fueled by a throttled stream of air into which a controlled amount of hydrogen is injected. A hydrogen fuel control system is used to control the amount of hydrogen injected into the throttled air stream using multiple parameters. The amount of hydrogen present in the hydrogen storage unit is monitored using an on-board hydrogen fuel measurement system utilizing a microcontroller and multiple sensors.

Abstract: A fuel supply apparatus reduces fuel vaporization and leakage the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus heat or cools the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus adjusts the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.

Abstract: An object of the present invention is to maintain stable air-fuel ratio on a venturi type fuel supply device, irrespective of the external load such as air-conditioner and electrical load, and to provide stable engine speed on idling state. A venturi type fuel supply device comprises a venturi chamber located in the upstream of a throttle valve and a passage for supplying air-fuel mixture gas into the venturi chamber. The passage is further equipped with a variable air bleeder valve for taking in air. When the operating state of the external load of the engine changes, the opening of the air bleeder valve is adjusted in accordance with the change so as to control the air-fuel mixture ratio of the mixture gas incoming from the passage into the venturi chamber.

Abstract: A throttle and fuel injector assembly and method of controlling fuel and air supply to an engine. The assembly and method provide combustion air through a carburetor and fuel through a carburetor.

Abstract: Fuel storage and delivery systems for compressed natural gas are provided that are constructed from ultra-high strength, low alloy steels containing less than 2.5 wt % nickel and having a tensile strength greater than 900 MPa (130 ksi). A primary benefit is that systems of this invention have substantially lower weight than that of currently available steel-based systems. Consequently, the fuel efficiency of a CNG vehicle can be improved due to the lower weight of the system of this invention, or the driving range of the CNG vehicle can be improved by increased fuel storage for the same volume at an elevated pressure, or the load-carrying capacity of the CNG vehicle can be improved. Another primary benefit is that systems of this invention have a cost per unit strength substantially lower than that of currently available systems.

Abstract: Arrangement for expanding liquefied gas. The arrangement includes a vaporizing element having a heat exchanger. The heat exchanger has an impermeable enclosure containing a heating fluid and a vaporizing tube made of a heat conducting material through which the liquefied gas passes. The vaporizing tube includes an intake connected to a supply reservoir and an outlet supplying vaporized gas. An element is provided for regulating a flow rate and a pressure of vaporized gas. A tube connects the outlet of the vaporizing tube to the element for regulating a flow rate and a pressure of vaporized gas. The element for regulating a flow rate and a pressure of vaporized gas is connected to an engine. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

Abstract: The present invention relates to a small adapter manifold that is constructed and arranged to fit into the standard fuel injector cavity for each cylinder of an automobile engine. The manifold includes a cavity for retaining the standard fuel injector and a liquid fuel passage, wherein the fuel injector can supply liquid fuel directly to the cylinder. The manifold also includes a separate hydrogen passage wherein a solenoid or servo valve regulates the flow of hydrogen entering each cylinder of the engine. A control module communicates with the on-board computer to allow the vehicle operator to choose a fuel. Once the fuel is chosen the computer utilizes the standard sensors to regulate the amount of hydrogen or gasoline supplied to the engine.

Abstract: The apparatus has a pneumatic controller, which controls the pressure in a gas conduit (1) in dependence on the pressure in an air conduit (2). Provided downstream of the regulator is a mixing device (4), which has a venturi-like mixing chamber (7). Extending into the inlet opening of the mixing chamber (7) is a nozzle (8), which is connected to the air conduit (2). Defined between the nozzle (8) and the edge (9) of the inlet opening of the mixing chamber (7) is an annular gap (10), which is connected to the gas conduit (1). Also operating in the air conduit (2) is a conical member (11) which is actuated by a linear motor (12). The mixture is withdrawn from the mixing chamber (7) by a fan (5), whose speed is controllable, and fed to the combustion device. The adjusting motor (12) for the conical member (11) operates in dependence on a signal from a sensor, which detects changes in the gas quality, the air pressure and/or the combustion air temperature.

Abstract: A method of operating an internal combustion engine under high charge dilution conditions using a hydrogen-rich fuel is disclosed. The high charge dilution conditions are attained by diluting the hydrogen-rich fuel with gases such as excess air or recycled exhaust gas. The mixture to be charged to the combustion chamber is thoroughly mixed before it is introduced into the combustion chamber while the combustion chamber maintains a substantially quiescent state such that the charge mixture is introduced with an angular momentum lower than that of a typical low emission engine. The result is an internal combustion engine with both high efficiency and low emissions, particularly, low NOx emissions.

Abstract: A method for operating a fuel system for an internal combustion engine operated with fuel gas. The fuel system has at least one electrically actuated shutoff valve (4) and at least one electrically operated heating device (14, 16).

Abstract: To reduce errors of measurement of fuel consumption resulting from air remaining in piping of a hydrogen supply apparatus, a hydrogen supply method for measuring fuel consumption of a hydrogen fuel vehicle comprises; a step (S02) of prior to supplying hydrogen from a measurement hydrogen tank to the hydrogen fuel vehicle, supplying hydrogen from a dummy hydrogen tank to hydrogen supply piping connecting the measurement hydrogen tank and the hydrogen fuel vehicle, to purge air in the hydrogen supply piping, and a step (S03) of after filling of the hydrogen supply piping with hydrogen from the dummy hydrogen tank, supplying hydrogen from the measurement hydrogen tank to the hydrogen fuel vehicle via the hydrogen supply piping.

Abstract: Method and apparatus for controlling the ration of the amount of fuel and the amount of air in a natural gas fueled internal-combustion engine intended to work in a specified engine-specific load-rotation speed diagram. The apparatus includes a throttle for controlling the amount of air supplied to the combustion chamber in the internal-combustion engine, injection devices for controlling the amount of natural gas supplied to the combustion chamber and control devices for controlling the throttle and the injection devices, whereby the control devices are arranged to control the ratio of the amount of fuel and the amount of air dependent on the current operating point in the internal-combustion engine's load-rotation speed diagram.

Abstract: A gas/air mixer assembly provides a Venturi metering system that may draw fuel from a zero governor, mix it with air to form a homogenous gas/air mixture for delivery to an internal combustion engine. The gas/air mixer assembly may also accept fuel under pressure from a gas metering valve or fuel injector for delivery to an internal combustion engine. The mixer includes an air horn, the relative position of which in relation to a shaped restriction body governs the air flow into the engine intake manifold. The flange of the air horn is configured to redirect the flow of air without generating significant turbulence, and providing a maximum velocity perpendicular flow to the injection of fuel to be mixed therein. The relative position of the air horn to the shaped restriction body is determined based on the cubic capacity and speed of the engine with which it is used.

Abstract: A system for controlling the temperature of gaseous fuel for a coolant cooled engine having a liquid to gas converter where the coolant is adapted to heat the converter. The system includes a gas temperature sensor adapted to measure the temperature of gas exiting the converter and a valve means adapted to regulate the flow of coolant into the converter. A control means determined when said gas temperature falls below a pre-determined value and opens the valve to cause an increased flow of coolant into the converter thus heating it. The system further includes an embodiment where the control means causes the valve means to close only when the temperature of gas exiting the converter is greater than a pre-determined value. A coolant temperature sensor also ensures that the valve can not be completely closed off unless the coolant temperature is above a pre-set value such as 50 degrees Centigrade.

Abstract: A method and apparatus are provided for supplying liquid gas as fuel to an internal combustion engine. From the liquid gas stream that is supplied to at least one liquid gas injection valve of the internal combustion engine, a portion is branched off and expanded. The liquid gas stream supplied to the internal combustion engine is cooled with coldness that results during the expansion, thus ensuring that the liquid gas stream supplied to the liquid gas injection valve is at least substantially liquid. The expanded liquid gas is supplied in a vaporous state to the internal combustion engine.

Abstract: The invention relates to a method for operating a gas-operated internal combustion engine, with the gas being injected into the combustion chamber by way of an injection apparatus and a stratified charge being produced. A fuel gas, preferably natural gas, hydrogen or a mixture of combustible gases, is injected into a chamber which is separated from the combustion chamber and can be connected with the same by means of a switchable valve and is mixed with a second gas, and that said gas mixture is injected directly into the combustion chamber by opening the switchable valve.

Abstract: Method and apparatus for controlling the ration of the amount of fuel and the amount of air in a natural gas fueled internal-combustion engine intended to work in a specified engine-specific load-rotation speed diagram. The apparatus includes a throttle for controlling the amount of air supplied to the combustion chamber in the internal-combustion engine, injection devices for controlling the amount of natural gas supplied to the combustion chamber and control devices for controlling the throttle and the injection devices, whereby the control devices are arranged to control the ratio of the amount of fuel and the amount of air dependent on the current operating point in the internal-combustion engine's load-rotation speed diagram.

Abstract: A fuel system for an internal combustion engine (12) operated with fuel gas includes an evaporator (1) in which the liquid fuel gas is transformed by the addition of heat into a gaseous state. The evaporator (1) has a first heating device (13) configured to transmit a portion of the waste heat of the internal combustion engine (12) to the fuel gas in the evaporator (1). The evaporator (1) has a second heating device, by means of which the fuel gas in the evaporator (1) can be heated regardless of the condition of the internal combustion engine (12). The second heating device (14) can include an electrical heating element, e.g., a PTC heating element.

Abstract: An emission control device for use with stationary or mobile gas-fueled internal combustion engines is described, which is placed in the fuel supply line and operates with full fuel authority. An oxygen sensor measures exhaust oxygen content. The valve internally houses a programmable microprocessor, a pressure transducer and a fuel flow conduit throttled by a balanced poppet valve. Signals to the microprocessor from the oxygen sensor, the pressure transducer indicating outflow gas pressure cause the microprocessor to motivate an actuator to move the valve within the gas stream and thus regulate the outlet pressure and also the gas flow rate to maintain a desired air/fuel ratio to the engine and keep exhaust emissions at an optimum level consistent with the engine operating load requirements and characteristics. Finite incremental control of valve position, preferably assisted by an internal position transducer, permits close control of the exhaust emissions.

Abstract: A Liquefied Petroleum Gas (LPG) fuel composition estimation method is provided that determines an LPG fuel composition from saturation vapor pressure data and an estimated fuel temperature and fuel pressure inside the fuel tank. A Liquefied Petroleum Gas Injection (LPI) System that employs the method is provided that employs the method of the invention.

Abstract: The invention is directed to a method and an arrangement for operating an internal combustion engine wherein the vapor pressure curve is determined with a pressure sensor in the fuel metering pipe during the shutoff phase of the engine and the fuel injection quantity in a subsequent start of the engine is corrected in correspondence to this pressure curve.

Abstract: A control valve module for gaseous fuels on spark ignited reciprocating engines is presented. The control valve module has a valve that controls gaseous fuel flow to a mixer or other device for air/fuel ratio control, an actuator for moving the valve position, and a controller. The controller receives a signal from a heated exhaust gas oxygen (HEGO) sensor that is an indication of the fuel/air ratio and actuates the valve to control the combustion mixture to a precise stoichiometric ratio.

Abstract: A natural gas fuel regulator for a natural gas fueled internal combustion engine for driving a co-generation plant, which allows exhaust recycled gas combustion while maintaining lower head temperatures to reduce thermal NOx emissions. The gas regulator has a modulation chamber, which modulates incremental pressure changes from the carburetion system to allow the engine to respond to load changes without the necessity for dynamic control feed back valve. In one aspect, a non-diaphragm venturi fuel/air-mixing unit with post turbo charger throttle adjustment is downstream of the natural gas fuel regulator to provide lean burn, low thermal NOx operation of the co-generation unit from no load to full load electrical generation.

Abstract: A LPG fuel system for an internal combustion engine, including a LPG fuel tank and a pump immersed in the fuel tank and driven by an electric motor, the pump being kept constantly running when the temperature is below 0° C. or above 80° C., whilst the supply voltage of the electric motor driving the pump is chopper-controlled when the temperature is between the two said values.

Abstract: A compact and efficient rotary pressure swing adsorption (PSA) apparatus with laminated sheet adsorbers is used to supply enriched oxygen and/or nitrogen streams to an internal combustion engine, allowing for reduced noxious emissions and enhanced engine performance.

Abstract: The present invention concerns apparatus, kits and methods for converting ICE vehicles to run on hydrogen fuel. Certain embodiments of the invention may comprise HIPAs, hydrogen gas manifolds and/or hydrogen fuel sources. The HIPAs are designed to replace the spark plugs in internal combustion engines and may comprise a hydrogen input tap, hydrogen channel, spark producer and/or one or more feedback sensors. In some embodiments, a computer and/or CPU may electronically control the timing of hydrogen ignition. The computer or CPU may be remotely programmed by modem and telephone connection to provide highly accurate ignition and other engine parameters to optimize vehicle performance and eliminate backfiring and/or pre-ignition. The hydrogen fuel may be packaged into cassettes or other modular storage systems. Cassettes may be inserted into Decom™ units to provide hydrogen fuel to the vehicle.

Abstract: A gas/air mixer assembly provides a Venturi metering system that may draw fuel from a zero governor, mix it with air to form a homogenous gas/air mixture for delivery to an internal combustion engine. The gas/air mixer assembly may also accept fuel under pressure from a gas metering valve or fuel injector for delivery to an internal combustion engine. The mixer includes an air horn, the relative position of which in relation to a shaped restriction body governs the air flow into the engine intake manifold. The flange of the air horn is configured to redirect the flow of air without generating significant turbulence, and providing a maximum velocity perpendicular flow to the injection of fuel to be mixed therein. The relative position of the air horn to the shaped restriction body is determined based on the cubic capacity and speed of the engine with which it is used.

Abstract: In a tank for a system for injection supply of LPG for internal-combustion engines, a number of hydraulic-connection elements associated to a service flange which closes the top opening of the tank are mounted on said flange by fixing to the bottom surface of the latter, without having any parts that are mounted via through holes of the flange. Provided inside the tank is an electrically operated pump which is fixed to the bottom wall of the tank structure and which in turn carries the structure of a level-sensing device of a capacitive type.

Abstract: A liquified gas delivery system for a motorized platform includes a holding tank configured to receive liquified gas. A first conduit extends from a vapor holding portion of the tank to a valve device. A second conduit extends from a liquid holding portion of the tank to the valve device. Fluid coupled to the valve device is a vaporizer which is in communication with an engine. The valve device selectively withdraws either liquified gas or liquified gas vapor from the tank depending on the pressure within the vapor holding portion of the tank. Various configurations of the delivery system can be utilized for pressurizing the tank during operation.

Abstract: A nozzle for delivering fuel to an engine is disclosed which is profiled with adjoining converging and diverging sections to accelerate the flow of fuel to a supersonic rate.

Abstract: The invention is in a regulator and converter operated to fumigate a volatile material, preferably a liquified petroleum gas (LPG), under vacuum, into an intake air flow of an internal combustion diesel engine to provide, on demand generated by an operator closing a throttle, passage of LPG to the regulator and converter wherein it is vaporized and the LPG vapors are passed into the engine intake air flow that travels into the engine. The injection of LPG vapors provides for an increase in engine output power and an improvement in fuel percentage of burn. The regulator and converter is connected the engine coolant system to receive a hot coolant flow, heating an LPG flow path therethrough to vaporize the LPG with the LPG vapors then directed from the regulator and converter into the engine intake air flow.

Abstract: An air-natural gas carburetor for a constant load stationary internal combustion engine including an air inlet passage connected to the intake manifold of an engine, a manually-controlled air valve in the inlet passage, a gas inlet conduit entering the air inlet passage and terminating in a discharge opening; a downstream pressure gas regulator supplying a constant gas pressure to the gas conduit and a manually-controlled valve in the gas conduit between the pressure regulator and the discharge opening which is independent in operation from the air valve.

Abstract: A scooter powered by a hydrogen powered internal combustion engine fueled by a throttled stream of air into which a controlled amount of hydrogen is injected. A hydrogen fuel control system is used to control the amount of hydrogen injected into the throttled air stream using multiple parameters. The amount of hydrogen present in the hydrogen storage unit is monitored using an on-board hydrogen fuel measurement system utilizing a microcontroller and multiple sensors.

Abstract: A method and internal combustion engine operable in a premixed charge compression ignition mode, comprising a combustion chamber, an intake system for delivering intake air, a mixing device that mixes a first fuel with the intake air to provide a premixed charge of air and the first fuel, a direct fuel injector adapted to directly inject a second fuel into the combustion chamber, and a control system adapted to control the direct fuel injector in a manner to provide a post-ignition injection where the second fuel is directly injected into the combustion chamber after onset of ignition of the premixed charge in the combustion chamber. The second fuel is preferably injected into the combustion chamber during combustion of the premixed charge and/or shortly after combustion of the premixed charge in the combustion chamber.

Abstract: A fuel injector system according to the present invention has a housing (52) having a valve assembly (56) disposed therein. A solenoid (54) is also disposed within the housing (52). A valve assembly (56) is disposed between an inlet port (82) and an outlet port (80). The valve assembly has a valve seat (74) having an opening (84) therein. A drive pin (108) extends at least partially through valve opening (84). A stop (78) has a spring (86) thereon. A valve element (76) is urged against the valve opening (84) by spring (86). The drive pin is at least partially coated with a lubricating coating. In the preferred embodiment at least a concave surface (144) of drive pin (108) is coated. In addition, a concave surface (140) of stop (108) is also coated. In addition, spring seat (79) may also be coated with a lubricating coating as well.

Abstract: A mixer for a multicylinder gas engine is provided in which a plurality of intake passages extend to a plurality of cylinders. A plurality of gaseous fuel nozzles, each having a nozzle orifice opening in a venturi part of the corresponding intake passage, are provided in a mixer main body. The plurality of gaseous fuel nozzles are connected to a gaseous fuel supply device, wherein a common surge tank housing the plurality of gaseous fuel nozzles and having a fuel intake pipe opening therein is provided on the mixer main body. The fuel intake pipe extends to the gaseous fuel supply device. Intake pressure pulsations that have passed through the gaseous fuel nozzles are attenuated within the surge tank, thereby achieving uniform distribution of a gaseous mixture to each cylinder, minimizes the number of parts, and prevents fluctuations in the fuel concentration of the gaseous mixture.

Abstract: An air-natural gas carburetor for a constant load stationary internal combustion engine including an air inlet passage connected to the intake manifold of an engine, a manually-controlled air valve in the inlet passage, a gas inlet conduit entering the air inlet passage and terminating in a discharge opening; a downstream pressure gas regulator supplying a constant gas pressure to the gas conduit and a manually-controlled valve in the gas conduit between the pressure regulator and the discharge opening which is independent in operation from the air valve.

Abstract: A process and apparatus are provided for in-situ production of hydrogen (H2) by alcohol decomposition for emission reduction from internal combustion engines. Hydrogen is generated by a catalytic process for in-situ production from alcohols, either neat, or in a hydrocarbon mixture, such as gasoline. The in-situ production of hydrogen is achieved using a solid basic catalytic bed provided with the internal combustion engine. The preferred catalyst is a copper (Cu) containing layered double hydroxide (LDH)-derived catalyst, such as a Cu/Al LDH-derived catalyst. At least a portion of an alcohol containing fuel is passed through the catalyst bed to generate hydrogen gas from the alcohol substantially without producing carbon monoxide. The fuel and generated hydrogen gas is injected into the internal combustion engine. Catalytic reactions are provided at temperatures in a range between ambient and 500° C., preferably between 150° C. through 400° C.

Abstract: On-off valve intended to be arranged at the outlet of the gas accumulation reservoir in an electronic gas injection system for an internal combustion engine, presenting a valve member made of metallic material, co-operating with a valve seat made in a body, which is also made of metallic material, to ensure the good quality of tightness in all operative temperature and pressure conditions, with prolonged reliability in time.

Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.

Abstract: A separate metering and metering unit for a diesel and/or propane or similar gas/liquid fuel powered internal combustion engine such as a dual fueled engine incorporates an intake filter, a lockout solenoid, and a metering device into a single integrated unit remote of the carburetor of the engine. The metering unit includes a heater immediately adjacent to the output of the injector metering device in order to provide heat necessary to prevent any freezing of the unit injector or gaseous fuel or oxidizers downstream of the metering unit. The injection of the propane allows for correct operation of a catalytic converter.

Abstract: An evaporation chamber controlled by a pressure drop across an intake valve is used in conjunction with a regulator to supply fuel such as propane in its gaseous state regardless of the chamber's orientation to a portioning fuel injection system for portable engines such as can be used for gas-powered fastening tools.

Abstract: A method of operating an internal combustion engine under high charge dilution conditions using a hydrogen-rich fuel is disclosed. The high charge dilution conditions are attained by diluting the hydrogen-rich fuel with gases such as excess air or recycled exhaust gas. The mixture to be charged to the combustion chamber is thoroughly mixed before it is introduced into the combustion chamber while the combustion chamber maintains a substantially quiescent state such that the charge mixture is introduced with an angular momentum lower than that of a typical low emission engine. The result is an internal combustion engine with both high efficiency and low emissions, particularly, low NOx emissions.

Abstract: An apparatus for diagnosing and controlling combustion of an internal combustion engine is provided which makes smooth operation of an engine possible by adjusting the combustion condition at the occurrence of knock, misfire, and flame quenching and also makes it possible to detect the occurrence of abnormality in cylinder pressure detectors without delay and deal with the abnormality without stopping the operation of the engine. The apparatus comprises a means to calculate the maximum pressure ratio Pp/P0, Pp being the maximum cylinder pressure, P0 being the compression pressure at one or a plurality of crank angles in the compression stroke, a means to compare said Pp/P0 with pressure ratios (threshold pressure ratios) predetermined for each of diagnosis categories, and a means(step) to diagnose the combustion condition such as cylinder pressure by judging the result of said comparison every cycle or every plural cycle.

Abstract: A MIXING DEVICE OF GAS FUEL WITH AIR FOR INTERNAL COMBUSTION ENGINES, apt to be inserted in an air supply conduit towards the carburetor, in coaxial arrangement and in direct communication with the air inlet opening of the same carburetor, of the type that comprises a cylindrical and hollow external body inside which a hollow body in the form of a truncated cone is seated, the open base of smaller diameter of the same faces the air inlet opening that defines said external cylindrical body, while its open bigger base corresponds with the outlet opening of the same external cylindrical body, the assembly being completed with a lateral connector pick that projects itself outwards from the same external cylindrical body.

Abstract: An engine includes air-assisted fuel injection including fuel injectors supplying fuel through cylinder head-mounted air injectors. An internal air passage in the cylinder head connects with internal air pockets receiving the injectors and supplying them with air. Seals on the air injectors prevent air leakage from the air pockets. The air temperature in the head is affected by an adjacent coolant passage.