摘要:
Die Erfindung betrifft ein Verfahren zum Betreiben einer selbstzündenden Brennkraftmaschine, insbesondere für Kraftfahrzeuge, die im Einstoffbetrieb mit selbstzündendem Flüssigkraftstoff und im Zweistoffbetrieb mit dem Flüssigkraftstoff als Zündmittel und mit gasförmigen oder flüssigen Alternativ-Kraftstoff beschickt wird, wobei der Flüssigkraftstoff über eine Einspritzeinrichtung in die Brennräume der Brennkraftmaschine eingebracht und die Verbrennungsluft über eine im Ansaugsystem vorgesehene Aufladeeinrichtung zur Regelung des Ladedrucks vorverdichtet wird, wobei ferner eine Zuführeinrichtung vorgesehen ist, über die im Zweistoffbetrieb der Alternativ-Kraftstoff in das Ansaugsystem einbringbar ist, des Weiteren mit einer Abgasrückführeinrichtung, die über ein Abgasrückführventil Abgase der Brennkraftmaschine in das Ansaugsystem zurückführt, wobei die Kraftstoffmengen über zumindest ein elektronisches Steuergerät nach Maßgabe betriebsspezifischer und gegebenenfalls fahrdynamischer Parameter derart zugemessen werden, dass die geforderte Leistung und in Verbindung mit stromab der Brennräume eingeschalteter Abgasreinigungseinrichtungen definierte Abgasgrenzwerte erzielt werden. Zur Erzielung eines verbesserten Betriebsverhaltens wird vorgeschlagen, dass die Brennkraftmaschine (1) im Zweistoffbetrieb mit einer erhöhten Abgasrückführrate betrieben ist und dass die Luftzufuhr im Ansaugsystem (8) zudem derart gedrosselt wird, dass sich im Abgas ein Lambdawert von größer 1 bis maximal 1,3, bevorzugt von größer 1 bis maximal 1,2, höchst bevorzugt von 1,03 bis 1,1 einstellt.
摘要:
La présente invention concerne un procédé amélioré de diminution des émissions polluantes d'une ligne d'échappement d'un moteur à combustion interne d'un véhicule notamment automobile, munie d'un filtre à particules, comprenant une étape de filtration des particules solides contenues dans les émissions polluantes par le filtre à particules, le filtre étant, lors du fonctionnement normal du moteur, recouvert d'une couche de particules solides permettant elle-même la filtration des particules solides les plus fines ayant une action bénéfique pour la filtration. Selon l'invention, le procédé comprend une étape de formation accélérée de la couche bénéfique (4) de particules solides (2), mise en oeuvre sur le filtre (1) vierge de toute particule.
摘要:
A method for controlling an internal combustion engine (10) limits emission of undesirable compounds of nitrogen and oxygen and provides increased transient power, the method comprising: operating the engine at a first power output by providing a first air/fuel mixture to a combustion chamber of the engine; receiving a request for an increased power output from the engine, that is greater than the first power output; providing a second air/fuel mixture to the combustion chamber of the engine, the second air/fuel mixture comprising a greater amount of fuel than the first air/fuel mixture; and treating a flow of exhaust gas with a non-urea aftertreatment to reduce a level of pollutant in the exhaust gas during a fuel enriched operation of the engine to invoke the real-time removal reduction of the pollutant while increasing engine power.
摘要:
An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst where NO x which is contained in exhaust gas and modified hydrocarbons react. The exhaust purification catalyst carries precious metal catalysts and is formed with a basic exhaust gas flow surface part. The exhaust purification catalyst has the property of reducing NO x if making the concentration of hydrocarbons which flow into the exhaust purification catalyst vibrate by within a predetermined range of amplitude and within a predetermined range of period. The system estimates the holding ability by which the NO x in the exhaust gas is held on the basic exhaust gas flow surface part of the exhaust purification catalyst and, when the holding ability becomes less than a predetermined judgment value of the holding ability, makes the concentration of hydrocarbons which flow into the exhaust purification catalyst rise.
摘要:
In an exhaust gas purifying device 101 that includes DPFs 12a and 12b to perform PM regeneration simultaneously through supply of fuel upstream of the DPFs 12a and 12b, an ECU 50 sets a target bed temperature for the purpose of raising the temperature of the DPFs 12a and 12b during PM regeneration, and controls the fuel supplied upstream of the DPFs 12a and 12b in accordance with the set target bed temperature. The ECU 50 detects parameter values relating to the DPFs 12a and 12b, and compares the detected parameter values with a temperature rise condition for raising the target bed temperature. Upon determination that the parameter values in both the DPFs 12a and 12b satisfy the temperature rise condition, the ECU 50 resets a new target bed temperature by raising the target bed temperature set for the DPFs 12a and 12b.
摘要:
In an exhaust gas treatment device in which a diesel oxidation catalyst and a DPF are provided in an exhaust pipe of an internal combustion engine, abnormal combustion in the DPF, occurring when the internal combustion engine varies from a high load condition to a low load condition, poses a problem. To solve this problem, in the present invention, a DPF abnormal combustion causing operation is determined to have occurred when the internal combustion engine shifts from a high rotation or high load operation region α to a low rotation, low load operation region β within a set time T 1 . When it is determined that a DPF abnormal combustion causing operation has occurred, abnormal combustion of PM collected in the DPF is suppressed by fully opening an intake throttle valve 44 in order to increase an exhaust gas flow so that heat is removed by sensible heat of the exhaust gas, thereby cooling a DPF device 52, and continuing a late post-injection in order to reduce an oxygen concentration of the DPF. As a result, an abnormal temperature increase in the DPF device 52 can be suppressed early.
摘要:
A method and an arrangement are provided for maintaining the oxidation of NO to NO2 in an oxidation catalytic converter arranged in a vehicle, the vehicle including an internal combustion engine which in operation emits exhaust gases to an exhaust gas after treatment system including the oxidation catalytic converter. A predetermined quantity of hydrocarbon is delivered to the exhaust gas aftertreatment system or the engine over at least one predetermined time interval for the purpose of maintaining the working temperature or regenerating an exhaust gas aftertreatment unit. The quantity of hydrocarbon is delivered to the exhaust gas aftertreatment system or to the engine through an injection with at least one predetermined fragmentation frequency and an injection period in order to maintain an NO2 production in the exhaust gas aftertreatment system that prevailed immediately prior to said time interval for the hydrocarbon injection.
摘要:
In order to regenerate an NOx trap catalyst 11 under rich spike control, an ECU 15 calculates an extent of a predicted temperature increase Δ T_ LNThos2 at the NOx trap catalyst 11 undergoing regeneration based upon operating conditions of an internal combustion engine 1, a degree of opening of an intake throttle 7 and control parameters t λ 1 , t λ 2 pertaining to post-injection via a fuel injector 4. Catalyst temperature control corresponding to any change in the operating conditions of the internal combustion engine 1, occurring while regeneration of the NOx trap catalyst 11 is in progress, is achieved by adjusting values taken for the control parameters t λ 1 , t λ 2 if the predicted temperature rise Δ T_LNThos2 is beyond an allowable range Δ T_LNT_cap.