Abstract: A continuously variable valve lift (CVVL) apparatus may include a control shaft that is disposed in parallel with a camshaft and is rotatably disposed on a journal that is disposed on a cam carrier, a CVVL device that is disposed on the control shaft, a journal bearing that is disposed on the journal such that the control shaft rotates on the journal bearing, and a washer that is disposed on the control shaft across the journal bearing. An engine comprising a CVVL apparatus is also disclosed.

Abstract: An electronic control unit (100) detects the position of an output shaft (221) by counting a position count value based on pulse signals generated from position sensors (S4, S5) in accordance with rotation of a motor (210). The electronic control unit (100) determines that the motor (210) is in a predetermined rotational phase, based on the pulse signals generated from the position sensors (S4, S5). The electronic control unit (100) determines the number of revolutions that have been made by the motor (210) when the determination is made, based on the magnitude of current applied to the motor (210) when the determination is made, and updates the position count value based on a reference count value stored in association with the predetermined rotational phase.

Abstract: In a valve timing control apparatus, phase-retard and phase-advance hydraulic chambers are defined among a plurality of shoes formed in a housing and a plurality of vanes formed integral with a rotor fixed to a camshaft. The rotor has a large-diameter portion formed between a first group of adjacent vanes and a small-diameter portion formed between a second group of adjacent vanes. The innermost end of a shoe of the shoes, opposed to the outer peripheral surface of the small-diameter portion, is configured to protrude radially inward rather than the innermost end of a shoe of the shoes, opposed to the outer peripheral surface of the large-diameter portion. A lock pin is located in the large-diameter portion of the rotor, whereas a lock hole, with which the lock pin slides into and out of engagement, is located in the inner face of a sprocket.

Abstract: A control valve for controlling a pressure fluid, said control valve comprising: a valve housing (10) comprising a valve inlet (P) for the pressure fluid, a control port (A, B) for connecting to an assembly which is to be operated using the pressure fluid, and a valve outlet (TA, TB); a valve piston (20) which can be moved in the valve housing (10) along an axis (R) and which comprises a hollow space (21) through which the pressure fluid can flow from the valve inlet (P) to the control port (A, B); and a filter device (30) which is arranged in the control valve and comprises a filter cross-section (35) which filters the pressure fluid as it passes through it, wherein at least a part of the filter cross-section (35) of the filter device (30) is situated in the hollow space (21) of the valve piston (20).

Abstract: A method for operating an internal combustion engine in the event of a fault in a crankshaft sensor is provided, the internal combustion engine having at least two camshafts and a speed and/or a position of the internal combustion engine being derived from a signal taken from the camshaft. In order to improve the exhaust gas performance of the internal combustion engine even in a crankshaft emergency operating mode, only a first camshaft is used to determine the speed and/or the position of the internal combustion engine, while the second camshaft. is adjusted in its angle of rotation in order to set a variable valve operating mechanism on the intake and exhaust valves of the internal combustion engine that are driven by the second camshaft.

Abstract: A crank trigger distributor assembly and method for sealing the crankcase from leaking vacuum through the distributor installation hole. A crank trigger distributor assembly and method for minimizing and/or preventing crankcase leakage, while being adjustable and adaptable to engine blocks or intake manifolds of various manufacturers. A crank trigger having a distributor stem, a collar located on the distributor stem, and at least one sealing element, the at least one sealing element incorporated within the collar. A crank trigger distributor assembly and method for adjusting rotor tip phasing without touching the distributor hold-down, as the cap itself can be adjusted.

Abstract: The present invention provides a piston for a spark-ignition engine, comprising: a land part 18, an upper surface part of which has a crown part 26 forming a combustion chamber; a pair of skirt parts 20 extending downward from a peripheral part of the land part 18 and facing each other in a radial direction thereof; a pair of sidewall parts 19 coupling side end parts of the pair of skirt parts 20 to each other; and a pin boss part 21 that is formed in each of the sidewall parts 19. The present invention can inhibit the generation of HC produced at the time of combustion, while thermally protecting a top ring 30 fitted into a top ring groove 24a on an outer circumferential surface of the land part 18. The crown part 26 is configured by a flat base surface 27 and a bulging part 15 bulging upward above the base surface 27, and a thinned part 40 provided in the land part 18 is formed deep such that the deepest part thereof is positioned inside the bulging part 15.

Abstract: In one exemplary embodiment of the invention, an assembly for an internal combustion engine includes a crankshaft, a drive mechanism coupled to the crankshaft and an oil pump actuated by the drive mechanism. The engine also includes a vacuum pump actuated by the drive mechanism, wherein the drive mechanism, oil pump and vacuum pump are disposed in an oil pan and a housing disposed between the oil pump and vacuum pump configured to enclose at least a portion the drive mechanism and restrict a flow of oil from the oil pan into the housing to reduce aeration of the oil during operation of the internal combustion engine.

Abstract: A lubrication system in an internal combustion engine is provided. The lubrication system includes a crankshaft bearing supporting a crankshaft, a supply line including an outlet flowing oil to the crankshaft bearing and an inlet receiving oil from an oil gallery, and thermal insulation at least partially surrounding at least a portion of an inner wall of the supply line and/or the oil gallery.

Abstract: Exemplary connecting rods and methods of making a connecting rod are disclosed. A method of making a connecting rod may include the step of providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end. The method may further include forming a crankshaft pin recess in the crankshaft end of the connecting rod blank and a piston pin recess in the piston pin end, and forming at least one lubrication recess in the piston pin end of the connecting rod blank. The lubrication recess and the piston pin recess may both formed concurrently.

Abstract: The two and three piece bullet aluminum timing chain cover with removable upper half and adjustable needle bearing idler sprocket is a unique non-conventional timing chain cover and sprocket combination that utilizes a sprocket to allow a longer chain to be used for the additional height separation from crank center to cam center line. It takes up timing chain slack or excessive side play within the chain, and allows it to be mounted and assembled on Dart engineering Chevy Engine Blocks part numbers 31282465 through 31293875.

Abstract: A combustible fluid-operated orbital engine having sets of cooperating cylinder and piston members with respective parallel axes of rotation. Respective cylinder and piston carrier wheels with respective axes of rotation parallel to the piston/cylinder axes of rotation carrying the pistons/cylinders circularly and orbitally and at all times in opposed relation on a common longitudinal axis along intersecting counter paths. Respective gearing structures or belts/sprockets supported by the cylinder and piston carrier wheels rotate the pistons/cylinders counter to their circular motion direction to maintain their opposed relation for their periodic interfittment when their respective paths intersect. A combustible fluid supply is provided to the cylinder member for combustion coincident with the periodic interfittment in engine operating relation. The pistons/cylinders may include ceramic material. The compression sealing system is located in the entry of each cylinder rather than being connected to the piston.

Abstract: A rotary engine that performs intake-exhaust, compression and explosive combustion without having moving piston heads in the rotor, is capable of obtaining large output with simpler construction. A flywheel rotor is arranged inside a cylinder that is inside a housing of a rotary engine, and is integrated into a single unit with a piston head that comes in contact with the inner wall. Direction of rotation of the rotor, An exhaust valve, an explosion pressure stopper valve and a fuel-intake closing valve are provided in the cylinder, Each of these valves operate via active pins that are engaged in guide grooves on the outer surface of the rotor and a guide groove on a cam of the output shaft, to execute the intake-exhaust, compression and explosive combustion.

Abstract: An internal combustion engine includes an engine assembly that defines a bore, and a piston disposed and moveable within the bore. The piston and the engine assembly cooperate to define a combustion chamber therebetween. A direct injection fuel system directs a fuel spray into the combustion chamber along a linear path. The combustion chamber includes a contoured surface having a plurality of annular recesses. The contoured surface divides and re-directs the fuel spray from the linear path into each of the annular recesses to form a plurality of independent rotating vortices.

Abstract: A method for reducing the particle emissions of a spark-ignition, direct-injection internal combustion engine is provided. The method comprises operating at least one cylinder superstoichiometrically, responsive to an injector coking level and sufficiently high cylinder temperature, for a duration to increase oxidation of coking residues.

Abstract: Various systems and methods for an engine system which includes a throttle turbine generator having a turbine which drives an auxiliary generator and disposed in a throttle bypass are described. In some examples, a throttle bypass valve is controlled to adjust airflow through the throttle bypass responsive to airflow to cylinders of the engine. In other examples, an operating parameter such as throttle position is controlled based on transient operating conditions of the engine. In still other examples, charging of a battery is coordinated between the auxiliary generator and a primary generator.

Abstract: Various systems and methods for an engine system which includes a throttle turbine generator having a turbine which drives an auxiliary generator and disposed in a throttle bypass are described. In some examples, a throttle bypass valve is controlled to adjust airflow through the throttle bypass responsive to airflow to cylinders of the engine. In other examples, an operating parameter such as throttle position is controlled based on transient operating conditions of the engine. In still other examples, charging of a battery is coordinated between the auxiliary generator and a primary generator.

Abstract: In various described embodiments skip fire control is used to deliver a desired engine output. A controller determines a skip fire firing fraction and (as appropriate) associated engine settings that are suitable for delivering a requested output. In one aspect, the firing fraction is selected from a set of available firing fractions, with the set of available firing fractions varying as a function of engine speed such that more firing fractions are available at higher engine speeds than at lower engine speeds. The controller then direct firings in a skip fire manner that delivers the selected fraction of firings.

Abstract: In various described embodiments skip fire control is used to deliver a desired engine output. A controller determines a skip fire firing fraction and (as appropriate) associated engine settings that are suitable for delivering a requested output. In one aspect, the skip fire controller is arranged to select a base firing fraction that has a repeating firing cycle length that will repeat at least a designated number of times per second at the current engine speed. Such an arrangement can be helpful in reducing the occurrence of undesirable vibrations.

Abstract: A fuel injector assembly has a fuel injector and a coupling device for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine. The coupling device includes a fuel injector cup configured to be hydraulically coupled to the fuel rail and to engage a fuel inlet portion of the fuel injector, a plate element fixedly coupled to the fuel injector cup and comprising a groove, and a snap ring arranged in the groove and configured to fixedly couple the plate element to the fuel injector to retain the fuel injector in the fuel injector cup in direction of a central longitudinal axis of the fuel injector and to prevent a movement of the fuel injector relative to the plate element in a first direction of the central longitudinal axis. A circlip arranged axially between the fuel injector and the plate element prevents a movement of the fuel injector relative to the plate element in a second, opposite direction of the central longitudinal axis.

Abstract: 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.

Abstract: In an inlet connector (4) for connecting at least one high-pressure line of a common-rail injection system to an inlet bore (6) of a fuel injector, a pressure pipe (7) connectable to the inlet bore (6) and a housing (8) including a connection for the at least one high-pressure line are connected to each other so as to form a sliding seat.

Abstract: The invention relates to engine building, and specifically to reciprocating internal combuston engines. The technical result of the invention consists in simplifying the design, the possibility of monitoring and regulating the moment of self-ignition of a homogenized fuel-air mix, and reducing the specific flow rate of the fuel. The method for operating an internal combustion engine consists in feeding a charge to the combustion chamber of a main cylinder and an auxiliary cylinder which are connected to one another and have different diameters, and in which the pistons are arranged. The piston of the auxiliary cylinder is delayed in accordance with the shaft rotation phase with respect to the piston of the main cylinder and as the piston of the main cylinder reaches the upper dead center thereof, when the majority of the charge is located in the auxiliary cylinder, and the charge to the piston of the auxiliary cylinder is boosted.

Abstract: The present invention provides a fuel heating system for preheating a vegetable oil based fuel for use in a diesel engine, said fuel heating system comprising a fuel tank (1), a heating device (3), a heat carrier arrangement (4,6) comprising a liquid heat carrier, and a heat exchanger (6) arranged inside said fuel tank, wherein said heating device is arranged to use vegetable oil based fuel from said fuel tank for heating the heat carrier, said heat carrier arrangement allows transport of hot heat carrier from said heating device to said heat exchanger and transport of cold heat carrier from said heat exchanger back to said heating device, and said heat exchanger is arranged to allow heat transfer from said heat carrier to said vegetable oil based fuel in said fuel tank.

Abstract: A control device for an internal combustion engine. The control device is arranged in a bypass duct between a pressure side and an intake side of a supercharging device. The control device includes a bypass valve comprising a valve-closure body which is configured to be pneumatically actuatable, and a control pressure space. A solenoid valve is configured so that a fluidic connection can be established and closed via the control pressure space between either the pressure side and the intake side or between the pressure side and the atmosphere: When the bypass valve is in a completely open position, the fluidic connection exists at least temporarily via the control pressure space between either the pressure side and the intake side or between the pressure side and the atmosphere. A closure of the fluidic connection brings about a resulting force in a closing direction on the valve-closure body.

Abstract: In a method for operating an internal combustion engine, a measured NOx actual value is compared to an NOx setpoint value, and an exhaust gas recirculation is controlled as a function of a deviation of the NOx actual value from the NOx setpoint value. Respective portions of internally recirculated exhaust gases and externally recirculated exhaust gases of a total of recirculated exhaust gases are adjusted for controlling the exhaust gas recirculation.

Abstract: Ignition is performed in such a way that a bias voltage is applied to a first electrode of an ignition plug and a current detection device detects a current that flows in the first electrode, that based on the value of the detected current, a smolder level detection device detects the level of a smolder produced in the ignition plug, and that a control device controls, based on the detected smolder level, at least one of the timing of ignition, the number of ignition events per power stroke of an internal combustion engine, and the amount of energy accumulated in an ignition coil device.

Abstract: A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side.

Abstract: A piñata device includes a main body housing an open-top container that may be filled with candy, toys, or other items. The open-top container is spring loaded using and arrangement of elastomeric bands and a locking mechanism which, when triggered, releases the open-top container, thereby causing the container to immediately accelerate towards an opening on the main body and launch the items outwards of the main body and onto the floor for collecting by the participants. In a preferred embodiment, the locking mechanism is triggered by hitting a target with a ball. After use, the container may be pushed or pulled back into a loaded position for reuse.

Abstract: A quick release buckle includes male and female members which are fastened together via a hinge connection. The male member includes a laterally extending pin which fits within a recess in the top front portion of the female member. The recess includes and undercut portion for receiving and retaining the male member pin. Both members include laterally extending top bars on the upper surfaces thereof. Pinching the top bars together releases the male member pin from the female member recess to unfasten the buckle.

Abstract: A back-tension archery release finger includes a housing containing a chamber which is adapted to receive a soft rubber insert. The housing includes at least one opening in a side wall thereof which communicates with the chamber to provide access to the insert. The insert projects through the side wall opening to define a contact surface for the finger of an archer. The housing may be contoured to match multiple fingers of the archer.

Abstract: A pneumatic assembly for a paintball gun is provided. The pneumatic assembly includes a valve stem, and a bolt slidably mounted on the valve stem. The bolt includes at least one bolt port arranged through a sidewall of the bolt. A sealing member is provided on the valve stem in communication with an inner surface of the bolt. The bolt slides from a rearward position to a forward position along the valve stem. Compressed gas flows through the bolt port and through the bolt aperture to fire a projectile when the bolt is in the forward position. A paintball gun incorporating the pneumatic assembly is also provided.

Abstract: A quiver for holding arrows or bolts. The quiver may be releasably attached to a mounting rail on a bow, belt, or the like. The quiver includes a frame connecting two end structures, each end structure having arrow head pockets, arrow shaft clips, and a connector for attachment to the frame. At a midsection of the frame is a mounting block with an attachment mechanism for releasably securing the quiver to the mounting rail. The preferable mounting rail is of the Picatinny type. A first set of arrows (three in the preferred embodiment) may be positioned with arrow heads in the arrow head pockets of one end structure and arrow shafts in the arrow shaft clips of the second end structure. A second set of arrows is positioned in a similar manner but in the opposite direction between the end structures on the frame.

Abstract: Methods, wires, and apparatus for use in cutting (e.g., slicing) hard, brittle materials is provided. The wire can be a super-abrasive wire that includes a wire core and super-abrasive particles bonded to the wire core via a metal bonding layer. This wire, or another type of wire, can be used to slice workpieces useful for producing wafers. The workpieces can be aligned within a holder to produce wafers using the device and methods presently provided. The holder rotates about its central axis, which translates to workpieces moving in orbit around this axis. A single abrasive wire, or multiple turns of wire stretched tightly between wire guides, is then contacted with the rotating holder to slice the workpieces.

Abstract: A portable gas-fired heater comprising a housing, a burner assembly, and a carbon dioxide detector system. The housing is adapted to at least partially enclose a fuel source. The burner assembly is enclosed by the housing.

Abstract: An oven includes a cooking chamber configured to receive a food product, a user interface configured to display information associated with processes employed for cooking, first and second energy sources, and a cooking controller. The first energy source provides primary heating and the second energy source provides secondary heating for the food product. The cooking controller may be operably coupled to the first and second energy sources. The cooking controller may include processing circuitry configured to enable an operator to make a browning control selection via the user interface by providing operator instructions to a selected control console rendered at the user interface. The selected control console may be selected based on a cooking mode of the oven. The browning control selection may provide control parameters to direct application of heat to the food product via the second energy source.

Abstract: A device is provided that includes a rectangular strip of metal joined on opposing ends to form a wall of a hollow, open-ended cylinder having a length of less than eighteen inches and a diameter less than twelve inches, a metal baffle disposed within the cylinder proximate a first end of the cylinder in a spaced apart relationship with the first end, a coupler defining a passageway extending through the wall of the cylinder proximate the metal baffle and on a side of the baffle opposite the first end and a blower connected to the coupler that blows air through the coupler into the cylinder.

Abstract: A multipurpose charcoal igniter makes a fire with much charcoal in safety, which can be carried easily, and which can be used in cooking foods as a burner for portable pots or pans. The multipurpose charcoal igniter includes a case in which charcoal is put and an igniter joined below the case for igniting fire. The case includes a brazier mounted inside the case to put charcoal therein and the igniter includes a fuel inlet to which a portable fuel bottle is joined, so that charcoal catches fire when the igniter is lit by receiving fuel from the portable fuel bottle.

Abstract: Energy recovery devices, systems and methods, and energy recovery control systems and methods for efficient extraction and reuse of waste heat from exhaust fumes generated from cooking appliances.

Abstract: A gas burner for household may include a zone for mixing combustible gas with air to form an air-gas mixture, an inner chamber with an inner table, and including sides with crenellated walls. A vertex may be formed on each end of the sides, which may be formed by intersecting curved surfaces. A port zone may be on an upper face of the crenellated walls. The port zone includes main ports, which may be centric relative to the vertexes. The symmetry axes of the main ports may be aligned towards the vertex closest to a corresponding port. The ports may be equidistant relative to one another. A lid may close the inner chamber and pass the mixture through the ports. The curved surfaces may have different geometries. The lid may include a cavity, where another burner may be placed.

Abstract: Heating a room in a structure with a fireplace includes feeding combustible gas to a burner of a combustion assembly of the fireplace to create heat and flames with hot exhaust air passing out of a combustion chamber of the fireplace through an exhaust duct and into an exhaust air conduit of a secondary heat exchanger and out of the structure.

Abstract: A system for heating a pool of water is provided. An inlet is provided for liquid to be delivered to the pool of water. The system includes an attachment apparatus having a body defining a fluid passageway from a first opening to a second opening. A third opening is disposed between the first and second opening. The attachment connects to the inlet for receiving the liquid. An adjustable diverging mechanism is mounted to the attachment operable to redirect flow out of the third opening. A tube having a flow channel and thermally conductive outer surface is coupled to the third opening and extends out of the pool to be exposed to environmental conditions and absorb thermal energy. The liquid passing through the flow channel of the tube returns to the pool of liquid and heated when passing through the tube prior to returning to the pool.

Abstract: An adjusting device is provided for solar tracker. The adjusting device is used for testing off-axis beam damage of a CPV module. A universal transmission unit is comprised for adjustment. Thus, a CPV module is exactly focused to a predestined position. Furthermore, a focusing point of the CPV module can be biased to the predestined position for testing off-axis beam damage.

Abstract: Solar energy generates steam in a “once-through” configuration without recirculation, with closely managed steam quality, to produce wet steam from high-contaminant feed water without scaling or fouling. Feed water is pressurized, preheated, and evaporated in a series of pipes exposed to concentrated solar energy to produce a water-steam mixture for direct distribution to an industrial process such as enhanced oil recovery or desalination. Water flow rates are managed based on measurements of solar energy and steam production to manage variations in the solar energy. Steam generator piping system uses continuous receiver pipe that is illuminated by segmented parabolic mirrors enabled to track the sun. Provisions for steam generator piping recurring maintenance are provided. Thermal energy from hot condensate and/or from low quality steam is recaptured and warms inlet water.

Abstract: A solar collector system is provided that comprises an absorber tube, a primary reflector, and a secondary reflector. In certain embodiments, the primary and secondary reflectors are positioned on opposing sides of the absorber tube, such that their respective focal points converge upon a longitudinal axis of the absorber tube. The secondary reflector may be configured with a substantially transparent surface facing away from the absorber tube, so as to permit passage of light beams there-through. Opposing surfaces of the secondary and primary reflectors, namely those facing substantially toward the absorber tube contain a reflective coating thereon to facilitate redirection of light beams toward the absorber tube. The solar collector system includes in certain embodiments a frame assembly, whereby the primary reflector, the secondary reflector, and the absorber tube are all configured to unitarily rotate about a common pivot axis defined by at least a portion of the frame assembly.

Abstract: A focal display panel is situated in a parabolic solar energy collection array having reflective surfaces and a tube containing a working fluid to be heated. The panel comprises a target area to display patterns of light and shadow reflected from the array, and provides a visual means for determining the amount, if any, by which the focal point of the parabolic array misses the center of the tube containing the heated working fluid.

Abstract: Method for distributing heliostats in a tower solar plant surrounded by a field of heliostats which reflect solar radiation on said tower. The distribution method for said heliostats consists of imitating the systems that are found in nature to maximize the collection of light (plant seeds, leaves and petals) and which is mathematically described by Fermat spirals in a number belonging to the Fibonacci series, through the placement, in polar coordinates, of each heliostat according to a radius and an angle defined by r n = c n · n ; ? n = n · 2 · ? ? 2 ; being: rn distance from the tower (2) to the position of the heliostat n (3), ?n the angle formed by the radius rn with the radius rn-1, n number of the heliostat (3) we wish to place, cn parameter that corresponds to the compactness index of the heliostats (3) in the plant, ? the irrational limit of the golden section, i.e.

Abstract: Disclosed is a method for producing an aqueous refined sugar solution, in which a biomass residues that are formed during a step of producing a sugar from a cellulose-containing biomass is removed in a step of producing an aqueous sugar solution, thereby preventing the clogging of a microfiltration membrane and/or an ultrafiltration membrane and ensuring long-term, stable production of an aqueous refined sugar solution.

Abstract: The present invention is directed to devices, systems, and methods for monitoring inhaled drug usage to predict when an acute attack or exacerbation of a disease, such as a respiratory disease, is imminent. Instrumented inhalers that use modular designs with standard components are disclosed, as are systems for monitoring the instrumented inhalers. Also disclosed are methods for determining whether or not a patient's inhaled drug usage pattern indicates that an acute attack or disease exacerbation is imminent, and notifying appropriate medical personnel of any usage patterns indicative of an attack or disease exacerbation. If such an attack or exacerbation is imminent, additional therapeutic agents may be dispensed to the patient or other interventions made.

Abstract: A device and method for administering at least one medical gas (NO) to a patient mechanically ventilated by means of a ventilator. The ventilator produces a constant respiratory gas flow (O2/N2) in a feed line. Gas pulses of the medical gas (NO) are supplied to said respiratory gas flow. The gas pulses are produced by means of at least two regulating means arranged in parallel and are fed to the line. Here, a control unit controls the regulating means depending on at least one parameter of the respiration of the patient.