Abstract: A first intake air control mode of setting an intake throttle valve to (or close to) a fully-opened state and setting an EGR valve to (or close to) a fully-closed state is performed when DPF temperature and a particulate matter deposition quantity are greater than corresponding predetermined values respectively, a no-injection operation state exists, and engine rotation speed is higher than a corresponding predetermined value. A second intake air control mode of setting the intake throttle valve to (or close to) a fully-closed state and setting the EGR valve to (or close to) a fully-opened state is performed when the DPF temperature and the particulate matter deposition quantity are greater than the corresponding predetermined values respectively, the no-injection operation state exists, and the engine rotation speed is lower than the corresponding predetermined value.

Abstract: There is provided with an ECU for estimating an unburned fuel amount (HC) emitted from an engine after fuel combustion or a temperature of a DPF based upon a required engine operating condition as a control target value. An exhaust gas temperature sensor for detecting a temperature of an exhaust gas emitted directly from the engine is provided. A program for compensating for an estimation error in regard to an estimation value of the unburned fuel amount estimated from the required engine operating condition, that is, an operating condition difference amount between the required engine operating condition and an actual engine operating condition, based upon an engine exhaust gas temperature detected from the exhaust gas temperature sensor is provided.

Abstract: An exhaust gas purifying apparatus for an internal combustion engine includes a collector, a differential pressure sensing device, a differential pressure based estimating device, a partition wall exposure sensing device, and a second regenerating device. The collector captures exhaust particles in exhaust gas. The differential pressure sensing device senses a differential pressure across the collector. The differential pressure based estimating device estimates an accumulation amount of the exhaust particles based on the differential pressure. The partition wall exposure sensing device senses a partition wall exposure state. The second regenerating device forcibly completely combusts the exhaust particles captured in the collector when the partition wall exposure sensing device senses the partition wall exposure state.

Abstract: A control device has a throttle valve and fuel injection valves supplying air and fuel to an internal combustion engine, a meter detecting an actual quantity of the air supplied to the engine, a sensor detecting an actual oxygen concentration of an exhaust gas outputted from an exhaust system of the engine, and an ECU controlling the valves. To regenerate an exhaust emission purifier disposed in the exhaust system at a target temperature appropriate to the regeneration of the purifier, the ECU determines a target oxygen concentration corresponding to a target air-fuel ratio and a basic air quantity according to a torque required of the engine and controls the valves according to the actual air quantity and the actual oxygen concentration to supply a basic quantity of fuel and the basic quantity of air to the engine at the target air-fuel ratio.

Abstract: A method is disclosed for estimating an amount of deposited particulates (PM) in a collector of an internal combustion engine. The method includes estimating the amount of inflow of PM into the collector and estimating a basic amount of decreased PM that flows into the collector and is burned and decreased. The method also includes estimating the amount of ash deposited on the collector. The method further includes correcting the basic amount of decreased PM based on the estimated amount of ash. Moreover, the method includes estimating an amount of deposited PM by a history expression based on the estimated amount of inflow of PM and the corrected amount of decreased PM. A related device is also disclosed.

Abstract: A diagnostic apparatus monitors a pressure difference detection apparatus that detects the pressure difference across an engine exhaust gas cleansing device in an exhaust gas system, with the diagnostic apparatus recognizing a condition of impeded transfer of gas between the pressure difference detection apparatus and the exhaust gas system, based upon a manner of convergence of successive detected pressure difference values that are produced by the pressure difference detection apparatus following a change in the exhaust gas flow rate.

Abstract: An exhaust gas purifying apparatus for a diesel engine has a filter provided in an exhaust pipe of the engine for trapping diesel particulates contained in exhaust gas. The filter is re-generated when an accumulated amount of the diesel particulates exceeds a predetermined value. An electronic control unit estimates the accumulated amount of the diesel particulates from a pressure loss at the filter, based on an accumulation characteristic in which the pressure loss is related to the accumulated amount of the diesel particulates, and corrects the accumulation characteristic depending on flow velocity of the exhaust gas.

Abstract: An exhaust gas purifying apparatus for an internal combustion engine includes a collector, which collects exhaust particles in exhaust gas discharged from the internal combustion engine. The exhaust gas purifying apparatus computes an amount of a predetermined gas component in the exhaust gas, which passes through the collector. The exhaust gas purifying apparatus computes a collected amount of the exhaust particles based on a pressure difference across the collector, based on a temperature of the exhaust gas, which passes through the collector, and based on the amount of the predetermined gas component. The exhaust gas purifying apparatus regenerates the collector by burning the exhaust particles collected in the collector when the collected amount reaches a predetermined value.

Abstract: An exhaust gas purifying apparatus for an internal combustion engine includes a collector, which collects exhaust particles in exhaust gas. The apparatus computes a pressure-difference-based measured value of a collected amount of the particles based on a pressure difference, and computes a pressure-difference-based estimated value by correcting the measured value. The apparatus computes an operational-state-based estimated value of the collected amount. The apparatus regenerates the collector by burning the exhaust particles when one of the pressure-difference-based estimated value and the operational-state-based estimated value reaches a predetermined value.

Abstract: In an exhaust emission control system for a vehicular internal combustion engine, a particulate filter collects particulate matters in an exhaust gas of the internal combustion engine. A filter regenerator regenerates the particulate filter by burning the particulate matters accumulated in the particulate filter. A filter front clogging detector determines whether a front end portion of the particulate filter is clogged by the particulate matters. A filter regeneration controller that controls the filter regenerator to perform a front regeneration to remove the particulate matters accumulated in the front end portion of the particulate filter when the filter front clogging detector determines that the front end portion of the particulate filter is clogged.

Abstract: A first intake air control mode of setting an intake throttle valve to (or close to) a fully-opened state and setting an EGR valve to (or close to) a fully-closed state is performed when DPF temperature and a particulate matter deposition quantity are greater than corresponding predetermined values respectively, a no-injection operation state exists, and engine rotation speed is higher than a corresponding predetermined value. A second intake air control mode of setting the intake throttle valve to (or close to) a fully-closed state and setting the EGR valve to (or close to) a fully-opened state is performed when the DPF temperature and the particulate matter deposition quantity are greater than the corresponding predetermined values respectively, the no-injection operation state exists, and the engine rotation speed is lower than the corresponding predetermined value.

Abstract: An exhaust gas purification device of a diesel engine having a DPF (diesel particulate filter) for collecting particulate matters such as soot and unburned components from exhaust gas of the diesel engine calculates an oil dilution quantity as a quantity of fuel diluting engine oil from a regeneration time of the DPF and an operation state. The exhaust gas purification device alleviates an increase in the oil dilution quantity by using a regeneration device that causes the oil dilution quantity less than the oil dilution quantity caused by another regeneration device when the oil dilution quantity exceeds a predetermined value. Thus, both of suppression of the oil dilution quantity and inhibition of deterioration of fuel consumption due to post-injection can be achieved.

Abstract: An exhaust gas purification system determines a deposited state of particulate matters based on a differential pressure across a diesel particulate filter (DPF) sensed by a differential pressure sensor. An electronic control unit (ECU) of the system prohibits the determination of the deposited state of the particulate matters, which is performed based on the differential pressure, when uniformity of temperature distribution inside the DPF is low. The ECU estimates temperatures at multiple points inside the DPF distant from an inlet along a direction of a flow of exhaust gas based on the temperature at the inlet sensed by an exhaust gas temperature sensor disposed immediately upstream of the DPF. The ECU determines the uniformity of the temperature distribution inside the DPF based on a range of the temperatures at the multiple points.

Abstract: A control device has a throttle valve and fuel injection valves supplying air and fuel to an internal combustion engine, a meter detecting an actual quantity of the air supplied to the engine, a sensor detecting an actual oxygen concentration of an exhaust gas outputted from an exhaust system of the engine, and an ECU controlling the valves. To regenerate an exhaust emission purifier disposed in the exhaust system at a target temperature appropriate to the regeneration of the purifier, the ECU determines a target oxygen concentration corresponding to a target air-fuel ratio and a basic air quantity according to a torque required of the engine and controls the valves according to the actual air quantity and the actual oxygen concentration to supply a basic quantity of fuel and the basic quantity of air to the engine at the target air-fuel ratio.

Abstract: A diagnostic apparatus monitors a pressure difference detection apparatus that detects the pressure difference across an engine exhaust gas cleansing device in an exhaust gas system, with the diagnostic apparatus recognizing a condition of impeded transfer of gas between the pressure difference detection apparatus and the exhaust gas system, based upon a manner of convergence of successive detected pressure difference values that are produced by the pressure difference detection apparatus following a change in the exhaust gas flow rate.

Abstract: There is provided with an ECU for estimating an unburned fuel amount (HC) emitted from an engine after fuel combustion or a temperature of a DPF based upon a required engine operating condition as a control target value. An exhaust gas temperature sensor for detecting a temperature of an exhaust gas emitted directly from the engine is provided. A program for compensating for an estimation error in regard to an estimation value of the unburned fuel amount estimated from the required engine operating condition, that is, an operating condition difference amount between the required engine operating condition and an actual engine operating condition, based upon an engine exhaust gas temperature detected from the exhaust gas temperature sensor is provided.

Abstract: A diesel particulate filter (DPF) for trapping exhaust particulates is located in an exhaust passage of a diesel engine. Deposit amounts of a soluble organic fraction (SOF) as an organic solvent soluble component and soot as a solid carbon component of exhaust particulate components deposited in the DPF are estimated respectively. When the SOF deposit amount reaches an SOF elimination execution deposit amount, the DPF is heated to or over relatively low SOF combustion temperature to execute SOF elimination treatment. When the soot deposit amount reaches a soot elimination execution deposit amount, the DPF is heated to or over relatively high soot combustion temperature to execute soot elimination treatment. The SOF elimination treatment is executed before the SOF becomes excessive to prevent rapid combustion of the soot due to combustion of the SOF.

Abstract: In an exhaust gas purifying apparatus for a diesel engine having a diesel particulate filter provided in an exhaust pipe, a pressure loss at the filter is detected. An accumulated amount of diesel particulates in the filter is calculated based on the pressure loss and a map for a relationship between the pressure loss and the accumulated amount. A compulsory re-generating operation is carried out when the calculated accumulated amount reaches at a predetermined threshold value, which is decreased to a smaller value depending on a combustion amount of the diesel particulates which are combusted and removed from the filter as a natural re-generating operation.

Abstract: An exhaust gas purification system has a first accumulation quantity estimation device that estimates an accumulation quantity of exhaust particulate matters collected by a diesel particulate filter (DPF) based on a flowing state of exhaust gas and a second accumulation quantity estimation device that estimates the accumulation quantity based on an operating state of an engine. The first estimation device is employed only when a flow rate of the exhaust gas is equal to or greater than a predetermined value and the engine is in a steady operating state. Otherwise, the second estimation device is employed. The exhaust gas flow rate is increased if the estimation by the second estimation device continues for a long time. Thus, an opportunity to perform the accumulation quantity estimation with the first estimation device is increased, and accumulation accuracy is improved.

Abstract: An electronic control unit (ECU) of an internal combustion engine calculates a present deposition quantity of exhaust particulate matters based on operating states of the engine such as a differential pressure of a diesel particulate filter (DPF). If the present deposition quantity exceeds a predetermined upper limit value, the ECU performs compulsory regeneration of the DPF to compulsorily combust and reduce the deposited exhaust particulate matters. The ECU determines that spontaneous regeneration occurs if a temperature of exhaust gas in the DPF is equal to or higher than a reference temperature. Thereafter, the ECU completes the compulsory regeneration to eliminate the deposited exhaust particulate matters if the ECU determines that the spontaneous regeneration stops and the deposition quantity becomes equal to or less than a predetermined lower limit value.