Abstract:
The invention concerns a method of controlling injection in a high-speed two-stroke fuel-injection internal combustion engine (10). According to this method, the operating behaviour is optimized even for compact small-size engines in that, in a first step, parameters (TL, TB, p, n) of the two-stroke engine (10) are continuously measured, these parameters characterizing the operating state of the two-stroke engine (10). In a second step, the injection amount or injection duration (injt) measured for the operating state of the two-stroke engine (10) at a given moment is calculated from the measured parameters (TL, TB, p, n); and in a third step, the beginning of injection or injection angle (injalpha) and injection amount or injection duration (injt) of the two-stroke engine (10) are controlled using the calculated injection amount or injection duration (injt) and according to given reference signals (Jignition, JHall, SalphaKW(UH)) taken from the two-stroke engine.
Abstract:
The invention concerns a fuel cooling system (100) for internal combustion engine injection systems, the injection system constantly conveying a substantially larger amount of fuel than the amount injected into the pressure circuit and allowing fuel to be discharged after its pressure has been relieved. According to the invention, in order to cool the fuel in an optimum manner without impairing other operating parameters, the intake pipe (10) of the internal combustion engine is guided such that it penetrates the fuel tank (11), the intake pipe having an enlarged outer surface (12) which is surrounded by a return ring (15) through which the returning fuel flows.
Abstract:
The invention relates to a driving device for a lawn trimmer, comprising a two-stroke engine having an injection valve (12), a clutch (15), devices for aspirating and releasing air (17, 20, 22), and a fuel pump (18), as well as possible additional component sets. The invention aims to create a compact structure and ensure functional reliability by cooling the fuel and guiding the air in a targeted manner. To this end, the injection valve (12) is mounted on the clutch side in such a way that the jet is directed in the direction of the spark plug (11).
Abstract:
The invention relates to a driving device for a motor scythe, comprising a two-stroke engine having an injection valve (12), a coupling placed in a coupling housing (15), air intake and air exit devices, a fuel pump (17), a starter housing (18) and possibly additional devices and equipment. In order to achieve a compact arrangement of the parts of the cited driving device with optimal cooling and combustion, the invention provides that the coupling housing (15) and the starter housing (18) be placed on opposite lying sides of the two-stroke engine and that the injection valve (12) with its injection nozzle be oriented towards the cylinder head or the spark plug (11).
Abstract:
In order to improve a hand-guided appliance with a two-stroke internal combustion engine with direct electronic fuel injection in such a way that the fuel injection is optimised, it is proposed to fit a partition (19) bordering the cylinder (15) which separates the adjacent intake chamber from the cooling air guide and to fit the fuel injection valve (17) above the intake port of the cylinder (15) passing through the partition (19).
Abstract:
Die vorliegende Erfindung offenbart ein Verfahren zum Erkennen einer fehlerhaften Stelleinrichtung in einer Brennkraftmaschine, insbesondere ein Stellglied eines längenvariablen Saugrohrs, einer Drallklappe, einer Tumble-Klappe oder allgemein eines Stellglieds im Luftpfad der Brennkraftmaschine. Anstatt eine Lagerückmeldung der Stelleinrichtung einzusetzen, wird nach erfolgter Umschaltung der Stelleinrichtung ein Regelsignal erfasst, um Ausschläge dieses Regelsignals oberhalb eines definierten Schwellenwerts zur Identifikation einer fehlerhaften Stelleinrichtung zu nutzen.
Abstract:
In order to improve an electronic control device (1) for operating functions of an internal combustion engine, having an intake pipe (6) to supply air for the combustion process, in such a way that its operational reliability is ensured, it is ensured that the electronic control device (1) be fitted in or on an air-intake device housing (3) or component thereof, on or projecting into the operational device. Cooling or intake air flow through the air-intake device housing (3) or component thereof, which may be sealingly close to the internal combustion engine, and the electronic control device (1) is shielded from the engine by the air-intake device housing (3) or component thereof.
Abstract:
In a process for controlling an injection valve (16) in a fast-running fuel-injection two-stroke internal combustion engine, in which a trigger signal is generated at each revolution of the engine at a triggering point (TP1, TP2) and the injection process is actuated in accordance with the trigger signal, where at low revolution speeds the start of injection is in a first region (ESB1) of the angle of rotation of the crankshaft and at higher revolution speeds the start of injection lies in a second region (ESB2) of said angle of rotation, where said second region (ESB2) is displaced in the "advance" direction towards the top dead centre (OT) in relation to the first region (ESB1), the best possible operation is attained in that a special triggering point (TP1 or TP2) is allocated to each of the two regions (ESB1 or ESB2) and, on a transition from low to high revolution speeds the control is switched over between the two triggering points (TP1, TP2) from a predetermined threshold speed.