Abstract: An exhaust gas purifying system for an internal combustion engine is arranged to determine a recovery execution timing for recovery processing of recovering an exhaust gas purifying device such as a particulate filter and a NOx trap catalyst from a specific content stacked state, to determine a target air/fuel ratio for executing the recovery processing, to determine a first engine controlled variable relating to an air/fuel ratio on the basis of the target air/fuel ratio, and to determine a second engine controlled variable relating to a combustion period at a value different from a value employed during normal processing when the recovery processing is executed.

Abstract: An engine control device is configured to prevent surging in an engine equipped with both a variable-nozzle turbocharger and an EGR device while curbing costs by utilizing existing equipment and avoiding undesirable secondary effects. When the engine is in a prescribed engine operating state in which the fuel injection quantity should be reduced, the EGR quantity delivered by the EGR device is reduced to a value lower than the normal value and the opening degree of the turbine nozzle of the turbocharger is increased. The prescribed engine operating state is defined to exist when the vehicle is decelerating and when the fuel injection quantity is decreased after regeneration of the NOx trapping catalytic converter.

Abstract: In order to prevent the generation of surge noise or other abnormal phenomena during deceleration of a vehicle, the present engine control apparatus comprises a turbo-supercharger driven by exhaust energy of the engine, at least one of an NOx trap catalyzer and a DPF mounted in the exhaust path of the engine for purifying the exhaust, an EGR path interconnecting the exhaust path and the inlet path of the engine, an EGR valve for adjusting the cross-section of the duct of the EGR path, means for detecting deceleration, and a fuel cutoff control means that, if predetermined conditions are satisfied, effects fuel cutoff control to reduces the rate of fuel injection, wherein the EGR valve is closed during the period of vehicle deceleration.

Abstract: A diesel particulate filter (14) which traps particulate matter and a NOx trap catalyst (13) which traps nitrogen oxides are installed in series in an exhaust passage (10) of a diesel engine (1). A controller (21) calculates a particulate matter deposition amount in the diesel particulate filter (14) (S4). The controller (21), when the particulate matter deposition amount exceeds a first predetermined amount (PM2), prevents sharp increase of the particulate matter deposition amount by prohibiting rich spike where the oxygen concentration of the exhaust gas is controlled to a value corresponding to a rich air-fuel ratio in order to regenerate the NOx trap catalyst (13) (S301, S302, S306), and prevents the particulate matter deposition amount of the diesel particulate filter (14) from reaching a limit.

Abstract: A thermal head of the present invention is provided with a thermal insulation layer formed on a radiative substrate, a plurality of heating resistors formed on a top face of the thermal insulation layer, a plurality of power suppliers connected to the heating resistors to form a heater on a part of the heating resistors, and a protection layer that covers surfaces of at least the heating resistors and the power suppliers, wherein the thermal insulation layer is formed by laminating an inorganic high thermal insulation layer including a complex oxide ceramic containing Si, transition metal, and oxygen or including complex nitride ceramic containing Si, transition metal, and nitrogen on an organic thermal insulation layer that contains polyimide resin.

Abstract: A turbocharged engine control system is provided that comprises an exhaust gas after-treatment system and a variable-capacity turbocharger. The turbocharged engine control system is configured to estimate a clogging ratio of the exhaust gas after-treatment system based on an equivalent surface area of the exhaust gas after-treatment system. A correction value is determined based on a turbine outlet pressure and the correction value is added to the clogging ratio. A target nozzle opening value is corrected such that the nozzle opening value increases as the exhaust gas after-treatment system becomes more clogged. Consequently, as the exhaust gas after-treatment system becomes clogged, the increase in pressure on the inlet side of the exhaust turbine (which acts as back pressure with respect to the engine) is suppressed and the increase in the internal EGR ratio caused by residual gas is also suppressed.

Abstract: An exhaust purifying device is arranged in an exhaust gas passage extending from an internal combustion engine. The exhaust purifying device includes a NOx trapping catalyst that traps NOx in the exhaust gas when an exhaust air/fuel ratio is leaner than stoichiometric and releases the trapped NOx therefrom when the exhaust air/fuel ratio is richer than stoichiometric, and a particulate filter that collects a particulate matter in the exhaust gas. A condition detecting device is arranged to detect a condition of the particulate filter. An exhaust air/fuel ratio control device is arranged to control the exhaust gas from the engine in such a manner that the exhaust gas has a target exhaust air/fuel ratio. When the exhaust air/fuel ratio is changed from a stoichiometric or richer side to a leaner side, the exhaust air/fuel ratio control device varies the exhaust air/fuel ratio under the leaner air/fuel exhaust condition in accordance with the condition of the particulate filter.

Abstract: An engine fuel injection control system including a particulate filter is configured to compare an accelerator request fuel injection quantity based on an accelerator depression amount to an air fuel ratio request fuel injection quantity determined based on a target air fuel ratio based on the engine operating condition. The engine fuel injection control system is configured to select the smaller of the accelerator request fuel injection quantity and the air fuel ratio request fuel injection quantity as a target fuel injection quantity. When the engine is operating in a low rotational speed region with full load, the target air fuel ratio is adjusted to a value substantially equal to the air fuel ratio that provides a maximum torque. Thus, the fuel is injected to achieve an air fuel ratio close to the stoichiometric air fuel ratio the torque performance and acceleration performance can be improved.

Abstract: A diesel engine (1) provided with a NOx catalyst (28A) and a diesel particulate filter (28B) performs lean burn operation during normal running, rich burn operation during regeneration of the NOx catalyst (28A), operation under the stoichiometric air-fuel ratio during desulphating of the NOx catalyst (28A), and operation under a slightly lean air-fuel ratio to regenerate the filter after desulphating of the NOx catalyst (28A). When the lean burn operation is applied, a controller (31) first controls the fuel injection amount, and controls an air supply amount based on the fuel injection amount. When rich burn operation is applied, the controller (31) first controls the air supply amount and controls the fuel injection amount based on the air supply amount. Due to this control, the response of the excess air factor control is enhanced while preventing torque fluctuation accompanying the variation of the target excess air factor.

Abstract: A diesel particulate filter 14 that traps particulate matters in an exhaust gas and a NOx trap catalyst 13 that traps NOx in the exhaust gas are disposed in an exhaust passage (10) in an internal combustion engine (1). When a regeneration timing of the diesel particulate filter (14) and one of a regeneration timing of SOx and a regeneration timing of NOx are overlapped, the diesel particulate filter regeneration is carried out first and thereafter, the SOx regeneration or the NOx regeneration is carried out.

Abstract: An exhaust gas cleaning system is provided that includes a particulate filter in an exhaust passage. The exhaust gas cleaning system is configured and arranged to determine an accumulation state of particulate matter in a particulate filter by obtaining a reference equivalent surface area of a passage inside the particulate filter based on a pressure difference between before and after the particulate filter, an exhaust gas flow rate, and a temperature of the exhaust gas passing through the particulate filter. The exhaust gas cleaning system is configured and arranged to obtain an adjusted equivalent surface area by adjusting the reference equivalent surface area based on a temperature of the particulate filter and the exhaust gas flow rate. Thus, an amount of particulate matter accumulated in a particulate filter of a diesel engine is accurately estimated without the estimation result being erroneously affected by the engine operating conditions.

Abstract: A thermal head includes a heat insulating layer made up of an electrically-conductive multiple low oxide ceramic layer of low thermal conductivity made of a chemical compound of Si, plural transition metals and oxygen. A first insulating layer made up of an insulated multiple high nitride ceramic layer of low thermal conductivity made of a chemical compound of at least Si, plural transition metals and nitrogen is formed on the heat insulating layer, and a second insulating layer made up of an SiO2 layer of high insulation characteristics or an Al2O3 layer is formed on the first insulating layer.

Abstract: A fuel injection control device is configured to suppress the effect of pressure pulsation occurring inside the accumulator section of an engine due to a first fuel injection and thereby accurately control the fuel injection quantity in an engine configured to execute a plurality of fuel injections per cycle. When the fuel injection quantity for a second injection executed after a first injection is set, the fuel injection interval is detected and the fuel injection quantity is revised based on the fuel injection interval. The amount of time from the end of the first injection (e.g., a pilot injection) to the start of the second injection (e.g., a main injection) is used as the fuel injection interval.

Abstract: An engine control device is configured to prevent surging in an engine equipped with both a variable-nozzle turbocharger and an EGR device while curbing costs by utilizing existing equipment and avoiding undesirable secondary effects. When the engine is in a prescribed engine operating state in which the fuel injection quantity should be reduced, the EGR quantity delivered by the EGR device is reduced to a value lower than the normal value and the opening degree of the turbine nozzle of the turbocharger is increased. The prescribed engine operating state is defined to exist when the vehicle is decelerating and when the fuel injection quantity is decreased after regeneration of the NOx trapping catalytic converter.

Abstract: A turbocharged engine control system is provided that comprises an exhaust gas after-treatment system and a variable-capacity turbocharger. The turbocharged engine control system is configured to estimate a clogging ratio of the exhaust gas after-treatment system based on an equivalent surface area of the exhaust gas after-treatment system. A correction value is determined based on a turbine outlet pressure and the correction value is added to the clogging ratio. A target nozzle opening value is corrected such that the nozzle opening value increases as the exhaust gas after-treatment system becomes more clogged. Consequently, as the exhaust gas after-treatment system becomes clogged, the increase in pressure on the inlet side of the exhaust turbine (which acts as back pressure with respect to the engine) is suppressed and the increase in the internal EGR ratio caused by residual gas is also suppressed.

Abstract: The controller (41) selects premixed combustion or diffusive combustion of the diesel engine (1) based on the running state detected by a sensor (33, 34) (S4, S5). The controller (41) calculates the target oxygen concentration and the target oxygen amount of the intake gas for the selected combustion type. When premixed combustion is selected, the controller (41) preferentially controls the oxygen concentration of the intake gas to the target value. When diffusive combustion is selected, the controller (41) preferentially controls the oxygen amount of the intake gas to the target value. By immediately shifting the target values according to the combustion type without setting transitional target values, increase of noxious substances in the exhaust gas due to the shift of combustion type can be prevented.

Abstract: An exhaust gas cleaning system is provided that comprises a particulate filter and an NOx trapping catalytic converter disposed upstream of the particulate filter. The exhaust gas cleaning system is configured to determine a combustion amount of the particulate matter accumulated in the particulate filter that are combusted by the NOx in the exhaust gas, and adjust the combustion amount of the particulate matter based on an NOx adsorption condition of the NOx trapping catalytic converter. Then, the exhaust gas cleaning system is configured to estimate a particulate matter accumulation amount in the particulate filter by subtracting the adjusted combustion amount of the particulate matter from a discharge amount of the particulate matter. Thus, the amount of particulate matter accumulated in the particulate filter is estimated more accurately by taking into consideration the combustion of particulate matter by NOx in the exhaust gas.

Abstract: An engine fuel injection control system including a particulate filter is configured to compare an accelerator request fuel injection quantity based on an accelerator depression amount to an air fuel ratio request fuel injection quantity determined based on a target air fuel ratio based on the engine operating condition. The engine fuel injection control system is configured to select the smaller of the accelerator request fuel injection quantity and the air fuel ratio request fuel injection quantity as a target fuel injection quantity. When the engine is operating in a low rotational speed region with full load, the target air fuel ratio is adjusted to a value substantially equal to the air fuel ratio that provides a maximum torque. Thus, the fuel is injected to achieve an air fuel ratio close to the stoichiometric air fuel ratio the torque performance and acceleration performance can be improved.

Abstract: An exhaust gas cleaning system is provided that includes a particulate filter in an exhaust passage. The exhaust gas cleaning system is configured and arranged to determine an accumulation state of particulate matter in a particulate filter by obtaining a reference equivalent surface area of a passage inside the particulate filter based on a pressure difference between before and after the particulate filter, an exhaust gas flow rate, and a temperature of the exhaust gas passing through the particulate filter. The exhaust gas cleaning system is configured and arranged to obtain an adjusted equivalent surface area by adjusting the reference equivalent surface area based on a temperature of the particulate filter and the exhaust gas flow rate. Thus, an amount of particulate matter accumulated in a particulate filter of a diesel engine is accurately estimated without the estimation result being erroneously affected by the engine operating conditions.

Abstract: A diagnosis system of an exhaust aftertreatment apparatus for an internal combustion engine is arranged to execute a first deterioration diagnosis of the exhaust aftertreatment apparatus on the basis of a change of a catalyst downstream side air/fuel ratio relative to a change of a catalyst upstream side air/fuel ratio during a rich spike control and to execute a second deterioration diagnosis from an inversion cycle of a feedback quantity during the feedback control of the catalyst downstream side air/fuel ratio during a stoichiometric control when the first deterioration diagnosis made a deterioration determination.