Abstract: A method for operating an internal combustion engine having a fuel system which feeds fuel at a given pressure to a metering valve provides that a controller defines the opening time and the closing time of the metering valve and correspondingly actuates the metering valve so that the metering valve opens and closes at the defined times. In order to permit precise metering of fuel even in high-speed internal combustion engines there is provision for the controller to define at least one of the times for the opening or closing of the metering valve while taking into account the counterpressure actually prevailing at the outlet opening of the metering valve.

Abstract: Procedure for starting a combustion engine with at least one combustion chamber, whereby injections from the high pressure system are deposited into the combustion chamber during the starting process, is thereby characterized, in that at least one injection into the combustion engine can be blanked out in order to limit a pressure drop in the high pressure system.

Abstract: The invention comprises a method and an article of manufacture to estimate exhaust gas temperature of an internal combustion engine during ongoing operation of the engine. This comprises determining states of a plurality of parameters of a combustion charge. A heat release of the combustion charge is estimated based thereon, and an exhaust gas temperature is estimated based upon the estimated heat release. Exemplary parameters of the combustion charge comprise engine speed, mass air flowrate, engine fueling and fuel injection timing, and, recirculated exhaust gas fraction.

Abstract: A feed unit has a surge chamber 1, a fuel pump 2, which is arranged in the surge chamber 1, and a pump holder 3, the fuel pump 2 being arranged in the pump holder 3 and the pump holder 3 being fastened in the surge chamber 1. The pump holder 3 has at least two rods 6 which are fastened in the surge chamber 1, the rods 6 being connected to a mount 5 for the fuel pump 2.

Abstract: An integrated valve device includes a casing having cylindrical portions each defining therein a fluid passage. The fluid passage accommodates a valve being adapted to opening and closing the fluid passage. A shaft extends through the valves to manipulate positions of the valves all together. Each cylindrical portion has a pair of wall portions each opposed to corresponding one sidewall surface of each of the valves. The pair of wall portions is located in a range out of an open-close range between a full close position and a full open position of the valve. Each wall portion has a protrusion for supporting the valve by being in direct contact with corresponding one of the sidewall surfaces when the protrusions of the pair of wall portions interpose therebetween the valve.

Abstract: A hand-held power tool has at least one operating medium tank having at least one opening. At least one connecting conduit is arranged external to the operating medium tank. At least one connecting member is inserted into the opening, wherein the at least one connecting conduit is connected to the at least one connecting member. Securing devices that secure a rotational position of the at least one connecting member in the opening are provided.

Abstract: A valve has a piezo actuator, a valve element, a valve body and a valve seat. At a predeterminable point in time, the valve element is controlled by a discharging process of the piezo actuator from a position in which it rests against the valve seat to a predetermined position located at a distance from the valve seat. The discharging process is divided into a first discharging period during which a predetermined first amount of electrical energy is discharged from the piezo actuator, a subsequent holding time period during which the piezo actuator is not controlled, and a subsequent second discharging period during which a predetermined second amount of electrical energy is discharged. The holding time duration and/or the first discharging period are/is adapted according to the course of a value that is not characteristic of the oscillation behavior of the piezo actuator during the holding time period.

Abstract: A pair of intake collectors (1A, 1B) separated by a partition (4A) aspirates air into each cylinder of a multi-cylinder internal combustion engine via branch pipes (3A-3F). A valve (8A, 8B) which shuts off the air flow between the intake collectors (1A, 1B) is fitted onto the partition (4A) via a valve frame (11) and a bearing boss (16A) provided on the valve frame (11). An edge of the partition (4A) is fitted into a groove (18) formed on the outer circumference of the valve frame (11) so as to prevent air from leaking through an engaging part between the partition (4A) and the valve frame (11) due to a Labyrinth effect. Further, an elastically connecting member (20) disposed on both sides of the bearing boss (16A) elastically connects the valve frame (11) and the groove (18), thereby preventing relative oscillation between the partition (4A) and the valve frame (11).

Abstract: A control system for an internal combustion engine, which is capable of properly setting fuel injection timing according to the actual degree of delay of the amount of fresh air to be supplied to cylinders of the engine, thereby making it possible to positively suppress torque variation, when the control system has switched an air-fuel ratio mode between a lean mode and a rich mode. The control system controls the air-fuel ratio of a mixture by switching the air-fuel ratio mode. In the lean mode, the control system sets a target fresh air amount for the lean mode, and in the rich mode, it sets a target fresh air amount for the rich mode. Upon switching the air-fuel ratio mode, the control system corrects the fuel injection timing according to the difference between the target fresh air amount for the lean mode or the rich mode and the detected fresh air amount.

Abstract: To prevent dew condensation in a crankcase in a lower part of the crankcase, wherein an oil pan is an integral part of an internal combustion engine, to prevent lubricating oil from being diluted. A crankcase cover covers at least an oil pan out of a crankcase and is provided to the bottom of the crankcase. A heat insulating material is provided between the crankcase and the crankcase cover. A cooling fluid passage for providing a circulation to cool a cylinder or a cylinder head is provided between the crankcase and the crankcase cover. A passage at least one end of which reaches a cylinder head from a crankcase via a cylinder block forms at least a part of a blowby gas passage, is directly provided to the crankcase, the cylinder block and the cylinder head. A flow control valve is arranged in the cylinder block or the cylinder head.

Abstract: A combustion engine includes a carburetor, which is a fuel supply device for introducing fuel into an intake air of the engine, and a fan housing for enclosing a cooling fan mounted on a front end portion of a crankshaft. The fan housing is formed with a flange so as to extend towards a position proximate to the carburetor, and a manually operable priming pump is fitted to the flange.

Abstract: The injection system has a high-pressure pump (7) having at least one pumping element (18) operated reciprocatingly to perform an intake stroke and a delivery stroke. Each pumping element (18) has a corresponding intake valve (25) communicating with an intake conduit (10) supplied by a low-pressure pump (9). The intake conduit (10) is fitted with an on-off solenoid valve (27) controlled by a control unit (16) asynchronously with respect to the intake of each pumping element (18). And the control unit (16) may control the on-off solenoid valve (27) by means of frequency-modulated and/or duty-cycle-modulated control signals (A, C).

Abstract: A method may include commanding operation of an engine in a first lift mode. The engine may include a valve lifter system that selectively operates a valve member in the first lift mode and a second lift mode through engagement with a camshaft. A first duty cycle of a cam phaser oil control valve (OCV) may be determined to maintain a first camshaft position corresponding to the first lift mode. The camshaft position may be maintained by a cam phaser that is coupled to the camshaft and in communication with the cam phaser OCV. Engine operation may be commanded to the second lift mode and a second duty cycle of the cam phaser OCV may be determined to maintain a second camshaft position corresponding to the second lift mode. A valve lifter system failure may be diagnosed based on a difference between the first and second duty cycles.

Abstract: The invention relates to a circuit arrangement (K), with a low-temperature coolant circuit (1) for the cooling of charge air on a motor vehicle with a charging device, comprising a charge air/coolant cooler (2). A temperature sensor (4) is provided at the exit of the coolant from the charge air/coolant (2), or directly thereafter, for the measurement of the coolant exit temperature. The invention further relates to a method for operation of such a circuit arrangement (K).

Abstract: A model-based estimation of mass airflow is provided which provides an accurate estimation of mass airflow without introducing undesirable time delays characteristic of filtered mass airflow signals.

Abstract: A high-pressure pump having a housing containing at least one pump element that has a pump piston driven by a drive shaft; the piston is guided so that it can slide in a cylinder bore of a housing part and delimits a pumping chamber therein. A support element supports the pump piston against the drive shaft; and a prestressed return spring acts on both the pump piston and the support element in the direction toward the drive shaft. The support element is guided so that it can slide in a receptacle, which is contained in the housing part that also contains the cylinder bore, in the direction of the longitudinal axis of the pump piston, but cannot rotate around the longitudinal axis.

Abstract: A fuel system for a carburetor that supports operation of an engine includes a body with a bore, a fuel source communicated with the bore and from which fuel is supplied to the bore for delivery to the engine, a drain unit and a control. The drain unit is communicated with the fuel source to selectively receive fuel from the fuel source and has a fuel chamber and an actuator operable to vary the volume of the fuel chamber. The control is communicated with the actuator to permit fuel flow from the fuel source to the fuel chamber when the engine is shut down and to cause fuel to flow from the fuel chamber to the fuel source prior to starting the engine.

Abstract: In order to provide a handheld work machine that does not require expensive start circuitry for the critical start-up phase of the combustion engine, and in which nevertheless the required constant supply voltage for the engine is present in order to achieve optimum starting behavior, a handheld work machine is provided with at least one combustion engine which in operation requires a supply voltage, and with a voltage generator that supplies a generator voltage that depends on the rotary speed of the combustion engine, which generator voltage is used to generate the supply voltage, wherein the handheld work machine is electrically connected to an additional voltage source that prior to starting the combustion engine provides the required supply voltage that at this point in time is not yet present.

Abstract: A water outlet chamber-type regulating device includes a chamber component having an inlet and an outlet for a fluid to be regulated, and including a member for regulating the flow, the member having a valve component translatingly movable and configured to close a passage cross-section between the inlet and the outlet, and is rigidly fixed to a control shaft. The chamber component includes at least one opening formed in its lateral wall, and the control shaft carries a second closing component, which is integral in translation with the shaft and is positioned on the shaft and has a shape that is configured to regulate the flow of water passing through the opening as a function of the regulation of the flow in the region of the passage cross-section.

Abstract: A method ignites the combustion of fuel in a combustion chamber (5) of engine (2), by introducing microwave radiation into the combustion chamber (5). The microwave radiation is produced in a microwave source (7) on the outside of the combustion chamber (5). The introduced microwave radiation is absorbed by the fuel distributed in the combustion chamber (5). The supply of energy, in the fuel, arising from absorption, distributes combustion in a large-volume in the combustion chamber (5), preferably in the entire combustion chamber (5) and in a homogenous manner, and is essentially simultaneously ignited. An associated ignition device (1) and an associated engine (2) are also provided.