Roger Potschin

Bio: Roger Potschin is an academic researcher from Bosch. The author has contributed to research in topics: Piston & Control valves. The author has an hindex of 11, co-authored 25 publications receiving 265 citations.

Fuel injection apparatus for internal combustion engines

Abstract: The fuel injection apparatus for internal combustion engines has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber to which fuel is delivered from a fuel tank and which communicates with a fuel injection valve that has an injection valve member by which at least one injection opening is controlled and which is movable in an opening direction counter to a closing force by the pressure generated in the pump work chamber, by means of a first electrically controlled control valve, a communication of the pump work chamber with a diversion chamber is controlled, and by means of a second electrically controlled control valve, the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which the injection valve member is urged at least indirectly in the closing direction. The diversion chamber is a pressure reservoir, in which an elevated pressure, compared to the pressure prevailing in the fuel tank, is maintained.

Fuel-injection system for internal combustion engines

Abstract: The fuel injection apparatus has one fuel pump or each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber; a first electrically triggered control valve is provided, by which a communication of the line with a relief chamber is controlled. A second electrically triggered control valve is provided, which is disposed near the fuel injection valve and by which the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which pressure the injection valve member is urged at least indirectly in the closing direction. Both control valves are disposed on the fuel injection valve.

Piezoelectrically actuated fuel injection valve

Abstract: A valve for controlling liquids which for its actuation is provided with a liquid-filled coupling chamber, which is disposed between an actuator piston of a piezoelectric actuator and a piston that actuates a valve member. To compensate for liquid losses suffered by the coupling chamber, which is briefly at high in each work cycle, the pressure difference that exists during the return stroke of the actuator piston between the coupling chamber and the opposite sides of the actuator piston and of the that actuates the valve member that are remote from the coupling chamber is utilized to achieve refilling in valveless fashion along gaps. The valve is used for use in fuel injection systems for internal combustion engines of motor vehicles.

Device for measuring the composition of fluids, in particular the components of exhaust gases from internal combustion engines

Abstract: A device is proposed for measuring the composition of fluids, in particular of constituents of exhaust gases from internal combustion engines, in which a light ray (32, 31) is used to irradiate the exhaust gas to be measured over the length of a measuring section (29) and is weakened or changed more or less, depending on the content of constituents. The light signal being received is advantageously registered by a measured length light receiver (18) which is shielded light-tight against the light emitting light source (14) and is evaluated in relation to the original light emission, in an evaluation circuit (26). In this simple way, accurate information is obtained of the exhaust gas clouding and of the loading of a fluid or gas with constituents which are optically active.

Vorrichtung zur Messung der Partikelbelastung im Rauch- oder Abgas eines Verbrennungsprozesses

Abstract: Eine Vorrichtung zur Messung der Partikelbelastung im Rauch- oder Abgas eines Verbrennungsprozesses weist einen zwischen einem optischen Sender (41) und einem optischen Empfanger (42) ausgesendeten Lichtstrahl auf, der durch zwei einander diametral gegnuberliegende, mit lichtdurchlassigen Korpern (29,30) verschlossene Lichtdurchtrittsoffnungen (16,17) in der Wand eines Abgasrohres (15) hindurchtritt und einen in dem Abgasrohr (15) gefuhrten Abgasstrom durchquert. Die Intensitatsschwachung des Lichtstrahls ist ein Mas fur die Partikelbelastung. Bei Verwendung der Mesvorrichtung zur Messung der Ruskonzentration im Abgas von Brennkraftmaschinen von Fahrzeugen wird diese unmittelbar am Auspuffrohr (15) angebracht, und die lichtdurchlassigen Korper (29,30) werden im Bereich der vom Abgasstrom beaufschlagten Flachen auf eine uber der Rusabbrandtemperatur liegende Temperatur aufgeheizt. Hierdurch wird eine Meswertverfalschung durch Rusablagerungen in der Messtrecke auf den lichtdurchlassigen Korpern (29,30) verhindert und ein kontinuierlicher Betrieb der Mesvorrichtung sichergestellt.

Fuel-injection device

Abstract: This invention pertains to a fuel-injection device, wherein a solenoid valve adjust a fuel-injection level of the fuel-injection pump by adjusting its throttling for the fuel-injection passage to supply the fuel to a compressor. A driving pulse to drive the solenoid valve is formed taking various factors into consideration. For example, the driving pulse is composed of its segment having a large duty ratio and of its segment having a small duty ratio in order to secure a responsiveness of the solenoid valve. The driving pulse is formed on the bases of a change in electrical voltage to drive the solenoid valve, varying levels of voltage drop in a wire harness installed for every cylinder, and of varying levels of responsiveness unique with fuel-injection pumps.

Fuel-injection valve

Abstract: The invention relates to a fuel-injection valve, in particular a high-pressure injection valve for directly injecting fuel into a combustion chamber of a compressed-mixture, spark-ignition internal combustion engine. Said valve is characterised in that an outlet opening (23) is provided downstream of the valve seat (20), the downstream end of said opening having a slit-forming element (30) that to a great extent closes the outlet opening (23). A slit-type flow outlet (35), through which a fuel spray can be discharged in a fan-type jet, is formed between the slit-forming element (30) and a front face (34) of the valve seat body (16).

Ventil zum steuern von flüssigkeiten

Abstract: Ein Ventil zum Steuern von Flussigkeiten ist mit einem piezoelektrischen Aktor (3) zur Betatigung eines Ventilglieds (2), das an einem Ende einen ein Ventilschliesglied bildenden Ventilkopf (7) aufweist, der mit einem an einem Ventilkorper (6) vorgesehenen Sitz (8) zum Offnen und Schliesen des Ventils (1) zusammenwirkt, ausgebildet. Auf einer dem Ventilglied (2) abgewandten Seite des piezoelektrischen Aktors (3) ist eine Hydraulikkammer (21) vorgesehen, die uber wenigstens eine Hydraulikleitung (23) mit einer gegenuber dem piezoelektrischen Aktor (3) abgedichteten Bohrung (5) des Ventilglieds (2) verbunden ist und in die ein mit dem piezoelektrischen Aktor (3) verbundener Kolben (20) eintauchbar ist, wobei die Hydraulikkammer (21) als hydraulische Feder ausgebildet ist, welche mit ihrer Federkraft auf den mit dem piezoelektrischen Aktor (3) verbundenen Kolben (20) das Vorspannelement und das Toleranzausgleichselement darstellt. Das Ventil ist insbesondere als Bestandteil eines Kraftstoffeinspritzventils vorgesehen.

Fuel-injection valve

Abstract: The invention relates to a fuel-injection valve (1) comprising an actuator (2), which is located in an actuator housing (13) that is connected on the side of a valve needle to a valve body (5, 6) by means of a non-positive fit. The actuator (2) is supported on the opposite end (8) of the actuator housing (13) to said connection. A compensatory section (3) of the actuator housing (13) consists of a material with negligible or a negative thermal expansion, so that the thermal expansion of the actuator housing (13) and the valve body (5) in succession reaching as far as a valve seal seat, corresponds approximately to the thermal expansion of the actuator (2) and transmission elements (12) reaching as far as the valve seal seat. The exterior of the actuator housing (13) is radially surrounded by a fuel chamber that is traversed by fuel.

Methods and techniques for adaptive search

Abstract: A method and apparatus for an adaptive search user interface is provided. An interface is provided that returns search results upon receiving each alphanumeric character of a search query term. Correlations of prefixes of alphanumeric characters and search results selected from previous searches are stored in a correlation matrix. Based upon the correlations in the correlation matrix, relevance rankings for search results with respect to the prefixes of alphanumeric characters are updated. Search results may be grouped based upon one or more common traits. Relevance rankings are also updated based upon the rate of change of selections recorded for a search result.