Abstract: A controller 1 includes a calculation unit 10 that receives the current sensor value A1 of the vehicle and calculates an injection amount based on the current sensor value A1 and a target value of the ammonia adsorption amount of the selective reduction catalyst 105 so that the ammonia adsorption amount approaches the target value, and a prediction unit 20 that receives the current sensor value B1 and calculates a corrected target value by future prediction based on the current sensor value B1. The calculation unit 10 calculates the injection amount based on the corrected target value calculated by the prediction unit 20.

Abstract: A controller 1 includes a calculation unit 10 that receives the current sensor value A1 of the vehicle and calculates an injection amount based on the current sensor value A1 and a target value of the ammonia adsorption amount of the selective reduction catalyst 105 so that the ammonia adsorption amount approaches the target value, and a prediction unit 20 that receives the current sensor value B1 and calculates a corrected target value by future prediction based on the current sensor value B1. The calculation unit 10 calculates the injection amount based on the corrected target value calculated by the prediction unit 20.

Abstract: Arranged downstream of a particulate matter filter incorporated in an exhaust pipe is a PM sensor with a detection portion on which particulate matter is deposited to output a deposition amount of the particulate matter. An assumption condition is set for making an assumption that the particulate matter filter is in a reference condition having a predetermined particulate matter capturing capability. Under the assumption condition, a virtual output value is calculated depending on a virtual deposition amount of the particulate matter in the PM sensor. The particulate matter filter is determined to have fault when, upon reaching of the virtual output value to a predetermined determination threshold, an output of the PM sensor is not less than the determination threshold.

Abstract: Provided is a method for detecting abnormality of an after turbo catalyst (ATC) where fuel from a fuel injection device receiving a post injection command from a controller undergoes oxidation reaction in an exhaust pipe and resultant reaction heat heats the exhaust gas, which provides an ATC-entry-side temperature measuring means measuring a temperature on an entry side of ATC to transmit a measured value to the controller and an ATC-downstream-side temperature measuring means measuring a temperature downstream of ATC. The controller, which transmitted the post injection command, determines whether a fuel injection device normally operates if temperature downstream of ATC is not nonelevated to that on the entry side of ATC, and determines that ATC has abnormality if the fuel injection device normally operates.

Abstract: Disclosed is a device for detecting any fixed closure of a fuel shut-off valve 7 which opens/closes a feed line 5 for feed of fuel 3 to a fuel addition valve 6. The device is provided with a pressure sensor 8 which detects a pressure of the fuel 3 between the fuel addition and shut-off valves 6 and 7 and a controller 9 which determines the fuel shut-off valve 7 to be fixed closed when a detection value of the pressure sensor 8 falls below a threshold set depending on a rotation frequency of an engine.

Abstract: A controller recognizes that fuel is and is not actually injected when an amplitude of fuel pressure fluctuations detected by a pressure sensor is not less than and is less than a pressure threshold ?, respectively, to obtain a number N of actual fuel injections and determines that a fuel addition valve operates normally and has malfunction when a ratio (N/S) of the obtained numbers N of the actual fuel injections to a number S of the fuel injection commands is not less than and is less than a number ratio threshold ?, respectively.

Abstract: On the basis of absolute values ? and ? of variations, before and after actuation of an exhaust brake, of fuel-injection and intake-air amounts, respectively, an exhaust brake is determined to normally operate when the absolute values ? and ? of the variations of the fuel-injection and intake-air amounts are not less than fuel-injection and intake-air variation thresholds, respectively; the exhaust brake is determined to have failure when the absolute values ? and ? of the variations of the fuel-injection and intake-air amounts are less than the fuel-injection and intake-air variation thresholds, respectively.

Abstract: Arranged downstream of a particulate matter filter incorporated in an exhaust pipe is a PM sensor with a detection portion on which particulate matter is deposited to output a deposition amount of the particulate matter. An assumption condition is set for making an assumption that the particulate matter filter is in a reference condition having a predetermined particulate matter capturing capability. Under the assumption condition, a virtual output value is calculated depending on a virtual deposition amount of the particulate matter in the PM sensor. The particulate matter filter is determined to have fault when, upon reaching of the virtual output value to a predetermined determination threshold, an output of the PM sensor is not less than the determination threshold.

Abstract: A device for determining a regeneration abnormality of a particulate filter has a temperature sensor detecting an exhaust temperature on an entry side of a particulate filter and a controller feedback controlling an injection amount of fuel to be added to a fuel addition valve to keep the exhaust temperature on the entry side of the particulate filter to a target regeneration temperature upon forced regeneration in a predetermined temperature range around the target regeneration temperature. The controller is configured to calculate the exhaust temperature on the entry side of the particulate filter based on the commanded injection amount to the fuel addition valve and detect any abnormality in feedback control based on deviation between the calculated exhaust temperature on the entry side of the particulate filter and the actually measured value by the temperature sensor.

Abstract: A device for determining any regeneration abnormality of a particulate filter 5 has a temperature sensor 10 detecting an exhaust temperature on an entry side of the particulate filter 5 and a controller 11 feedback controlling an injection amount of fuel to be added to a fuel addition valve 8 to keep the exhaust temperature on the entry side of the particulate filter 5 to a target regeneration temperature upon forced regeneration in a predetermined temperature range around the target regeneration temperature. The controller 11 is configured to simulatedly calculate the exhaust temperature on the entry side of the particulate filter 5 based on the commanded injection amount to the fuel addition valve 8 and detect any abnormality in feedback control based on deviation between the calculated exhaust temperature on the entry side of the particulate filter and the actually measured value by the temperature sensor 10.

Abstract: Provided is a method for detecting abnormality of an after turbo catalyst (ATC) 43 where fuel from a fuel injection device 10 receiving a post injection command from a controller 2 undergoes oxidation reaction in an exhaust pipe 41 and resultant reaction heat heats the exhaust gas, which provides an ATC-entry-side temperature measuring means 42 measuring a temperature on an entry side of ATC 43 to transmit a measured value to the controller 2 and an ATC-downstream-side temperature measuring means 44 measuring a temperature downstream of ATC 43. The controller 2, which transmitted the post injection command, determines whether a fuel injection device 10 normally operates if temperature downstream of ATC 43 is not nonelevated to that on the entry side of ATC 43, and determines that ATC 43 has abnormality if the fuel injection device 10 normally operates.

Abstract: On the basis of absolute values ? and ? of variations, before and after actuation of an exhaust brake, of fuel-injection and intake-air amounts, respectively, an exhaust brake is determined to normally operate when the absolute values ? and ? of the variations of the fuel-injection and intake-air amounts are not less than fuel-injection and intake-air variation thresholds, respectively; the exhaust brake is determined to have failure when the absolute values ? and ? of the variations of the fuel-injection and intake-air amounts are less than the fuel-injection and intake-air variation thresholds, respectively.

Abstract: Disclosed is a device for detecting any fixed closure of a fuel shut-off valve 7 which opens/closes a feed line 5 for feed of fuel 3 to a fuel addition valve 6. The device is provided with a pressure sensor 8 which detects a pressure of the fuel 3 between the fuel addition and shut-off valves 6 and 7 and a controller 9 which determines the fuel shut-off valve 7 to be fixed closed when a detection value of the pressure sensor 8 falls below a threshold set depending on a rotation frequency of an engine.

Abstract: A controller recognizes that fuel is and is not actually injected when an amplitude of fuel pressure fluctuations detected by a pressure sensor is not less than and is less than a pressure threshold ?, respectively, to obtain a number N of actual fuel injections and determines that a fuel addition valve operates normally and has malfunction when a ratio (N/S) of the obtained numbers N of the actual fuel injections to a number S of the fuel injection commands is not less than and is less than a number ratio threshold ?, respectively.

Abstract: An absolute value of a deviation of an actual EGR ratio, calculated in a current operational status of an engine 1, from a target EGR ratio set on the basis of current operational status of the engine 1 is acquired and is multiplied by a quotient, as gain, acquired from division of a feedback correction amount of opening degree of an EGR valve 12 by an upper limit of the feedback correction amount to determine normality when an acquired product is close to “0” and determine higher degree of abnormality the further the product is away from “0”.

Abstract: An absolute value of a deviation of an actual EGR ratio, calculated in a current operational status of an engine 1, from a target EGR ratio set on the basis of current operational status of the engine 1 is acquired and is multiplied by a quotient, as gain, acquired from division of a feedback correction amount of opening degree of an EGR valve 12 by an upper limit of the feedback correction amount to determine normality when an acquired product is close to “0” and determine higher degree of abnormality the further the product is away from “0”.