L'invention concerne un procédé d'estimation d'une quantité d'oxydes d'azote et/ou d'une quantité d'ammoniac à la sortie d'un piège à NOx disposé dans une ligne d'échappement d'un moteur à combustion interne, le procédé comprend: - une étape d'obtention (E100) d'une information de richesse du…
The present disclosure relates to a gas engine heat pump including: an engine which burns a mixed air of air and fuel; a first charger which compresses the mixed air and supplies to the engine; a first exhaust flow path which is connected to the engine, and through which exhaust gas discharged from…
Various methods and systems are provided for controlling emissions. In one example, a controller is configured to respond to a sensed exhaust oxygen concentration by changing a fuel injection timing to maintain particulate matter (PM) within a range, and then adjusting an exhaust gas recirculation…
Rich control is performed to hold an air-fuel ratio of an exhaust gas discharged from an engine combustion chamber temporarily richer than the stoichiometric air-fuel ratio by injecting additional fuel into a cylinder in an expansion stroke or exhaust stroke while an exhaust gas recirculation rate…
Rich control is performed to hold an air-fuel ratio of an exhaust gas discharged from an engine combustion chamber temporarily richer than the stoichiometric air-fuel ratio by injecting additional fuel into a cylinder in an expansion stroke or exhaust stroke while an exhaust gas recirculation rate…
The invention relates to a motor vehicle comprising a control module capable of selectively placing the selective catalytic reduction module and/or the nitrogen oxide absorption module in poor operation in active mode according to at least one parameter (R, P) among a parameter indicative of engine…
An internal combustion engine comprises a hydrocarbon feed valve (15) arranged in an engine exhaust passage and a booster pump (60) for boosting an injection pressure of the hydrocarbon feed valve (15). The hydrocarbon feed valve (15) performs NO X removal injection and clogging prevention…
Provided is an exhaust gas purification system which can suppress a decrease in engine torque during a desulfurization process applied to a NOx storage reduction catalyst. The exhaust gas purification system includes a NOx storage reduction catalyst (3) provided in an exhaust pipe (2) of an engine…
In an internal combustion engine, a fuel injector (15), an NO x storage catalyst (13), and a particulate filter (14) are arranged in an engine exhaust passage. When post injection (PI) is performed for raising the temperature of the NO x storage catalyst (13) or particulate filter (14), if fuel for…
An internal combustion engine according to the present invention includes an exhaust treatment apparatus provided in an exhaust passage, and a burner apparatus provided upstream of the exhaust treatment apparatus to raise exhaust temperature. A valve driving state of at least one of an intake valve…
An exhaust emission control device includes a NOx purification catalyst, a three-way catalyst provided upstream of the NOx purification catalyst, a first air-fuel ratio sensor provided upstream of the three-way catalyst, a second air-fuel ratio provided downstream of the NOx purification catalyst…
An internal combustion engine exhaust purifying device is provided that can avoid surging occurring with enrichment of the exhaust A/F. It includes a high-pressure EGR path 6 that recirculates a portion of the exhaust gas upstream of a turbine (81) to an intake manifold (3), a high-pressure EGR…
A new engine control system has been developed for diesel engines (10). This operates in accordance with the engine performance characteristic diagrams, to enable rich/weak running control. In the new controller (23), a computer changes over to rich- or weak running in accordance with predetermined…
A degree of deviation between an actual air-fuel ratio and a value detected by an air-fuel ratio sensor is obtained as a difference dTHC between a target catalyst bed temperature THCt and a catalyst bed temperature THC (S118). The difference dTHC is converted to a target air-fuel ratio correction…
The invention relates to a control apparatus capable of separately detecting an unexpected fluctuation in the amount of NOx discharged from an engine (10) (combustion chamber (17)), separately from deterioration of lean NOx catalyst performance, thereby avoiding incorrect diagnosis of deterioration…
A combustion control apparatus for an internal combustion engine, including an exhaust gas purifier, and a control unit programmed to selectively implement a first combustion mode and a second combustion mode, the second combustion mode providing main combustion and preliminary combustion at or…
Two lambda sensors (6, 7) are located at equal distances downstream of the nitrogen oxides (NOx) trap (3) in the exhaust line (2). One lambda sensor has a rhodium-based catalytic layer. Their output signals are connected to a differential measurement system (8), to determine the quantity of NOx in…
An exhaust passageway (5) of an engine (1) is provided with a NOx storage-reduction catalyst (20) for trapping and storing NOx from an exhaust gas lean of a stoichiometric air-fuel ratio. When the storage of the NOx in the catalyst (20) becomes large, the engine (1) is operated at a rich air-fuel…
Process for operating a direct-injection I.C. engine, especially a direct-injection Otto engine, involves feeding a predetermined exhaust gas amount from the exhaust gas back into the intake air. During operation of the engine with a high load and revolutions in the homogeneous lean operation, a…
A means (16) is provided for delaying combustion in the engine (1) and a control system (11, 15) is provided for activating the combustion delay means during the regeneration of the filter (5). The engine includes branches formed by an intake air collector (3) and an exhaust fumes collector (5). A…
Removal of poisoning substance (sulfur oxidant) is controlled based upon estimating an amount of the poisoning substance deposited in an exhaust gas purification catalyst (5) disposed in an exhaust pipe (9) for an internal combustion engine (1), a lower limit is set corresponding to a possible…
A low NOx combustion mode is executed in which the fuel injection timing IT is greatly advanced to 36 DEG BTDC as compared with a normal value of roughly 10 DEG BTDC. At this fuel injection timing IT, the smoke emission amount is suppressed below an extremely low value, even if the EGR ratio Regr…
A control device of an internal combustion engine (1) which is equipped with an exhaust system including an exhaust purification device (11) purifying exhaust gas, and which performs a recovery process for recovering purification capability of the exhaust purification device (11) in operation, is…
In an exhaust gas purifying apparatus 1 provided with a nitrogen oxides absorption-reduction catalyst 2 for executing rich spike when the integrated value NOx mass of the NOx computed from the operating state of the engine E exceeds the predetermined first reference value NOxSL. a NOx sensor 13 is…
An exhaust gas purifying apparatus comprises a control unit (29) operative to estimate an amount of NOx absorbed by a NOx trap material (17) disposed in an exhaust passage (10) and to make an air-fuel ratio richer so as thereby to cause the NOx trap material to release sulfur when the estimated…
An air-fuel ratio control system for an internal combustion engine provided with a NOx trap catalyst which is disposed in an exhaust gas passageway and arranged to trap NOx when the air-fuel ratio of exhaust gas flowing to the NOx trap catalyst is lean and to release and reduce trapped NOx when the…
Sulphur oxides in the exhaust gas of a vehicle engine (1) are trapped by a nitrogen oxide trapping catalyst (5A). A controller (6) calculates the sulphur oxide poisoning amount of the trapping catalyst (5A) from the running condition of the vehicle (S13), and desulphating the sulphur oxides by a…
In a process to remove sulfur from an automotive NOx storage trap operated in lean burn mode, a calculation model determines the sulfur removal steps. The steps are modified using information derived from a knock signal and the fuel anti-knock sensitivity, fuel consumption. The fuel consumption is…
Process for controlling an operating modulus of a lean burn IC engine (10) having an exhaust gas tract (14) with a NOx storage catalyst (20) and a gas sensor (24) comprises allowing a lean operating modulus of the engine with lambda more than 1 depending on threshold values for a temperature of the…
In air-fuel ratio control apparatus and method for an internal combustion engine having an EGR valve interposed in an EGR passage between an intake manifold and an exhaust manifold, a target EGR quantity is calculated, a determination is made which of air-fuel ratio feedback controls through an EGR…