Abstract:
There is provided a NOx occlusion reduction-type catalyst 32 that is provided in an exhaust passage 13 of an internal combustion engine 10, occludes NOx in exhaust when the exhaust is in a lean state, and reduces and purifies the occluded NOx when the exhaust is in a rich state; an exhaust injector 34 that is provided in the exhaust passage 13 and is positioned further upstream than the NOx occlusion reduction-type catalyst; a NOx-purging control unit 60 that performs NOx purging of reducing and purifying the NOx occluded in the NOx occlusion reduction-type catalyst 32 by lowering the exhaust to a prescribed target lambda by fuel injection by the exhaust injector 34; and a NOx-purging-prohibition processing unit 70 that inhibits performance of the NOx purging in a case where the exhaust cannot be lowered to the target lambda even if the fuel injection is performed at a maximum limit injection amount of the exhaust injector 34.
Abstract:
A control apparatus for an internal combustion engine (10) having a supercharging device, which includes: a valve-drive mechanism (74) that variably controls the valve timings for at least intake valves (72); target valve timing setting means for setting a target valve timing for at least the intake valves (72) in accordance with an operation condition of the engine in a low engine speed range; and valve-drive mechanism controlling means for controlling the valve-drive mechanism based on the target valve timing. Each of the target valve timings is differently set such that (a) a valve-overlap duration is provided in a negative pressure region; (b) the valve-overlap duration in the negative pressure region is made shorter in a first supercharging region; and (c) the valve-overlap duration in the first supercharging region is made longer in a second supercharging region where the higher load of the engine (10) is required.
Abstract:
A learning device changes each of multiple parameters to an increased side and to a decreased side with respect to a reference value set for each of the multiple parameters. The learning device calculates an approximation degree for each combination of the changes of the multiple parameters. The learning device performs update by using the combination of the changes providing the highest approximation degree among the approximation degrees as the combination of the updated reference values when an update end condition is not satisfied. The update end condition is a condition that the approximation degree at the reference values is higher than any of the approximation degrees after the change. The learning device decides the reference values as learning values of the parameters when the update end condition is satisfied.
Abstract:
An exhaust gas recirculation apparatus of an internal combustion engine (1) includes a turbocharger (5) provided with a turbine (5b) in an exhaust passage (4) and a compressor (5a) in an intake passage (3) , a low pressure EGR passage (31) which connects the exhaust passage (3) downstream of the turbine with the intake passage upstream of the compressor, a high pressure EGR passage (41) which connects the exhaust passage upstream of the turbine with the intake passage downstream of the compressor; an exhaust gas control catalyst (10) provided in the exhaust passage downstream of the turbine and upstream of the low pressure EGR passage; and EGR gas amount changing means (13) for simultaneously changing amounts of EGR gas flowing through the low pressure EGR passage and the high pressure EGR passage (41) such that a temperature of the exhaust gas control catalyst is within a target range.
Abstract:
L'invention concerne un système de supervision du recalage d'au moins un paramètre de contrôle du fonctionnement d'un moteur Diesel (10 ;51) de véhicule automobile, comportant des moyens (22 ;60) de recalage du au moins un paramètre présentant au moins un état de recalage actif et un état de recalage suspendu. Ce système comprend des moyens (14) d'acquisition du point de fonctionnement du moteur, des moyens (28 ;102 ,104 ,106 ,108) de comparaison du point de fonctionnement du moteur à des plages prédéterminées de fonctionnement du moteur, et des moyens (24 ;90) de commande de l'état de fonctionnement des moyens (22 ;60) de recalage pour commander la transition de l'état de recalage actif à l'état de recalage suspendu lorsque le point de fonctionnement du moteur est compris dans une première plage et commander au moins une fois la transition de l'état de recalage suspendu à l'état de recalage actif lorsque le point de fonctionnement du moteur est compris dans une seconde plage.
Abstract:
A control for controlling an intake air into an engine is provided. A control valve 14 for adjusting an amount of the intake air into the engine is provided. A desired opening degree of a control valve provided in an intake air passage into the engine is determined based on a clogging coefficient. The clogging coefficient indicates a degree of clogging of the intake air passage. An opening degree of the control valve is controlled to converge to the desired opening degree. The clogging coefficient is updated based on a feedback correction amount for feedback controlling a rotational speed of the engine during idling operation. If a leakage in a blow-by gas passage that is connected between the engine and the intake air passage is detected, the update of the clogging coefficient is prohibited.
Abstract:
The invention concerns a method for automatic adaptation of an injection engine (1) by a computer (21) connected to sensors (26, 28) supplying an engine filling parameter and to an oxygen probe (33) in the exhaust gases, which consists, at each adapting cycle, in defining a new line of control magnitude based on the filling parameter using new coefficients computed from the co-ordinates of 2 points whereto correspond corrected values of the control magnitude from a working line filtered and stored during the preceding cycle, one at least of said 2 points being previously acquired, then in adopting as new working line, a line intermediate between the new line and the previous working line. The invention is applicable to injection engine control.