摘要:
Einrichtung zum Einspritzen von Kraftstoff in Brennräu me von Brennkraftmaschinen, mit einer Einspritzdüse (10) und einem Glühvorsatz (30), dessen Beheizung nach Maßga be des Temperaturzusammenhanges zwischen der jeweils herrschenden, von einem Temperaturfühler (54) erfaßten Abgastemperatur und einer dieser Abgastemperatur bestimn mungsgemäß zugeordneten Glühkörpertemperatur gesteu ert ist. Dadurch ist erreicht, daß eine Steuerung der Glühkör pertemperatur möglich ist, ohne daß der Glühkörper aus Edelmetall bestehen muß.
摘要:
Deterioration of a selective catalytic reduction (SCR) catalyst (5) can be diagnosed with sufficient accuracy, by making use of a sensor (7) for measuring an air fuel ratio of exhaust gas flowing into an exhaust gas purification apparatus, which is equipped with the SCR catalyst (5), and a further sensor (8) for measuring an air fuel ratio of exhaust gas flowing out from the exhaust gas purification apparatus. In an exhaust gas purification apparatus for the exhaust gas purification apparatus, in a time period in which inducement-processing is carried out which is to induce a water gas shift reaction in a catalyst disposed at the upstream side of the SCR catalyst (5), by changing an air fuel ratio of exhaust gas discharged from an internal combustion engine (1) from a lean air fuel ratio into a predetermined rich air fuel ratio, an air fuel ratio of exhaust gas flowing into the SCR catalyst (5) and an air fuel ratio of exhaust gas flowing out from the SCR catalyst (5) are measured by said air fuel ratio sensors (7, 8), respectively, and deterioration of the SCR catalyst (5) is diagnosed based on a difference between the measured values of these sensors, wherein the inducement-processing is carried out when the amount of NH 3 adsorption in the SCR catalyst (5) is equal to or less than a predetermined amount.
摘要:
An internal combustion engine is equipped with an exhaust purification catalyst (20), an upstream air-fuel ratio sensor (40), a downstream air-fuel ratio sensor (41), and sensor heaters (56) of the upstream air-fuel ratio sensor (40) and the downstream air-fuel ratio sensor (41). A control device comprises an air-fuel ratio control part configured to control the air-fuel ratio of the exhaust gas and a heating control part configured to control the heating of the air-fuel ratio sensors. The heating control part controls the sensor heaters so that the temperature of the upstream air-fuel ratio sensor (40) becomes less than the activation temperature and so that the temperature of the downstream air-fuel ratio sensor (41) becomes the activation temperature or more while the internal combustion engine is stopped by the automatic stop function. The air-fuel ratio control part controls the exhaust air-fuel ratio based on the outputs of the two air-fuel ratio sensors during engine operation and control the air-fuel ratio temporarily based on only the output of the downstream air-fuel ratio sensor (41) after the internal combustion engine has been restarted after automatic stop.
摘要:
This invention relates to an air-fuel ratio control device of an internal combustion engine, and an object of the invention is to provide an air-fuel ratio control device of an internal combustion engine that is capable of suppressing a deterioration in the controllability of air-fuel ratio feedback control after restarting an engine. Figure 6 illustrates an elapsed time after engine startup, and output values of a front A/F sensor 16 and a rear A/F sensor 18. As shown in Figure 6 , the output values of the front A/F sensor 16 and rear A/F sensor 18 become equal from a time T3 onwards. Hence, by switching to normal air-fuel ratio feedback control at the time T3, highly accurate air-fuel ratio feedback control that is in accordance with the actual situation is enabled.
摘要:
An exhaust pulsation control system for an internal combustion engine having at least one cylinder communicating with an intake passage via an intake port and with an exhaust passage via an exhaust port, comprises engine operating condition detecting means and exhaust gas temperature detecting means. Further, there is provided a memory storing target values of exhaust gas temperature related to predetermined engine operating conditions and a control means connected to said memory and adapted to control an air/fuel ratio of an air/fuel mixture to be supplied to said engine so as to approach said detected exhaust gas temperature to said target exhaust gas temperature corresponding to the engine operating conditions detected.
摘要:
Einrichtung zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen, mit einer Einspritzdüse (10) und einem Glühvorsatz (30), dessen Beheizung nach Maßgabe des Temperaturzusammenhanges zwischen der jeweils herrschenden, von einem Temperaturfühler (54) erfaßten Abgastemperatur und einer dieser Abgastemperatur bestimmungsgemäß zugeordneten Glühkörpertemperatur gesteuert ist. Dadurch ist erreicht, daß eine Steuerung der Glühkörpertemperatur möglich ist, ohne daß der Glühkörper aus Edelmetall bestehen muß.
摘要:
A straddle-type vehicle comprises an engine which generates driving power for allowing the straddle-type vehicle to travel and emits an exhaust gas; an exhaust device including: a catalyst which contacts the exhaust gas to clean the exhaust gas, an inner tube in which the catalyst is disposed in an inner passage thereof through which the exhaust gas flows, the inner tube extending to a location that is downstream of the catalyst, in a flow direction of the exhaust gas; and an outer tube which covers an outer peripheral surface of at least a region of the inner tube in an axial direction of the inner tube, and has a muffling space through which the exhaust gas discharged from an exit of the inner tube is flowed to reduce an exhaust noise radiated from the engine; at least one exhaust pipe through which the exhaust gas emitted from the engine is led to the catalyst; and a downstream oxygen sensor which is disposed to detect an oxygen concentration of the exhaust gas flowing through the inner passage of the inner tube after flowing through the catalyst, at a location that is downstream of the catalyst in the inner passage of the inner tube.
摘要:
An internal combustion engine is equipped with an exhaust purification catalyst (20), an upstream air-fuel ratio sensor (40), a downstream air-fuel ratio sensor (41), and sensor heaters (56) of the upstream air-fuel ratio sensor (40) and the downstream air-fuel ratio sensor (41). A control device comprises an air-fuel ratio control part configured to control the air-fuel ratio of the exhaust gas and a heating control part configured to control the heating of the air-fuel ratio sensors. The heating control part controls the sensor heaters so that the temperature of the upstream air-fuel ratio sensor (40) becomes less than the activation temperature and so that the temperature of the downstream air-fuel ratio sensor (41) becomes the activation temperature or more while the internal combustion engine is stopped by the automatic stop function. The air-fuel ratio control part controls the exhaust air-fuel ratio based on the outputs of the two air-fuel ratio sensors during engine operation and control the air-fuel ratio temporarily based on only the output of the downstream air-fuel ratio sensor (41) after the internal combustion engine has been restarted after automatic stop.
摘要:
An apparatus includes an engine output module that determines an engine output power parameter for an engine. The apparatus includes an output power threshold module that determines if the engine output power parameter is below an output power threshold. The apparatus includes a NOx module that determines a nitrogen oxide (“NOx”) efficiency of a selective catalytic reduction (“SCR”) system in response to the output power threshold module determining that the determined engine output power parameter is below the output power threshold. The SCR system is in exhaust receiving communication with the engine. The apparatus includes a NOx threshold module that determines if the NOx efficiency is below a NOx efficiency threshold, and a NOx warning module that sends a NOx alarm signal in response to the NOx threshold module determining that the NOx efficiency is below the NOx efficiency threshold.