摘要:
Fuel supply system (10) of engine (1) includes a fuel supply pump (11), a common rail (12), fuel injector valves (13), and a cut-off valve (14), and a reducing-agent supplying device which includes a metering valve (16), a fuel introducing nozzle (17) and a secondary fuel supply passage (P2) and which is arranged to introduce a fuel as a reducing agent into an exhaust system (40) of the engine under the control of an electronic engine control unit (80), which control the application of an electric current to the metering valve. The engine control unit constitutes a part of a diagnosing apparatus arranged to diagnose the reducing-agent supplying device, on the basis of a change of an air/fuel ratio (A/F) of an exhaust emission from the engine, which air/fuel ratio is continuously detected during the period of introduction of the fuel into the exhaust system.
摘要:
Fuel supply system (10) of engine (1) includes a fuel supply pump (11), a common rail (12), fuel injector valves (13), and a cut-off valve (14), and a reducing-agent supplying device which includes a metering valve (16), a fuel introducing nozzle (17) and a secondary fuel supply passage (P2) and which is arranged to introduce a fuel as a reducing agent into an exhaust system (40) of the engine under the control of an electronic engine control unit (80), which control the application of an electric current to the metering valve. The engine control unit constitutes a part of a diagnosing apparatus arranged to diagnose the reducing-agent supplying device, on the basis of a change of an air/fuel ratio (A/F) of an exhaust emission from the engine, which air/fuel ratio is continuously detected during the period of introduction of the fuel into the exhaust system.
摘要:
An exhaust gas sampling device (110) coupled to an aftertreatment system (120) for treating exhaust gas flowing therethrough. The exhaust gas sampling device comprises an inlet passage (175), an outlet passage (178), a sensor passage (176), and a sensor (119). The inlet passage extracts a portion of the exhaust gas from the aftertreatment system, and the portion of the exhaust gas has a physical property that that is substantially similar to an equivalent physical property of a cross section of the exhaust gas flowing through the aftertreatment system. The sensor passage is positioned fluidly between the inlet passage and the outlet passage, and the sensor is in fluid communication with the sensor passage for providing a signal indicative of a property of the portion of the exhaust gas. The outlet passage reintroduces the portion of the exhaust gas back into the aftertreatment system.
摘要:
The invention concerns a catalytic filter for depolluting a gas loaded with soot particles and gaseous pollutants, obtained by impregnating in a catalytic solution a filtering structure formed by an assembly of honeycomb-type monolithic elements, wherein the porosity of the cement used as coating and/or as joint and/or as plug is less than the porosity of the material constituting said element(s).
摘要:
There are provided a failure determination device for determining failure of a humidity sensor that detects the humidity of exhaust gases from an internal combustion engine and a control system for an exhaust passage changeover valve. In one form of the invention, it is judged based on a detected operating condition of the engine whether or not the engine is in an operating condition in which failure determination of the humidity sensor can be executed. It is then determined whether or not the humidity sensor has failed, based on a result of detection by the humidity sensor. In another form of the invention, a changeover valve switches an exhaust passage having a catalytic device arranged therein, between a main exhaust passage and a bypass exhaust passage and having an adsorber arranged therein which is capable of adsorbing hydrocarbons and water. A humidity sensor is arranged at a location downstream of the adsorber in the bypass exhaust passage, for detecting humidity of the exhaust gases guided into the bypass exhaust passage. The changeover valve is driven based on a result of the detection.
摘要:
The invention relates to a method for operating an exhaust gas aftertreatment system (3), having the following steps: - determining a permissible energy input into at least one exhaust gas aftertreatment element (7) of the exhaust gas aftertreatment system (3); - ascertaining a current energy input into the at least one exhaust gas aftertreatment element (7) by ascertaining at least one energy input variable which characterizes the current energy input; and - actuating an adjusting device (11) which varies a distribution of an exhaust gas mass flow to the at least one exhaust gas aftertreatment element (7) and a bypass path (9) that runs about the at least one exhaust gas aftertreatment element (7) depending on the permissible energy input and the current energy input.
摘要:
An ECU executes a program including the steps of: when a switching valve is controlled to be closed (YES at S1000), comparing exhaust gas's temperature, as detected, with a map value (S1100); if the exhaust gas's temperature is larger than the map value (YES at S1110), determining that the switching valve normally operates (S1300); and if the exhaust gas's temperature is smaller than the map value (NO at S1100), determining that the switching valve has abnormality.