An automatic regeneration controller for a particular filter comprises an engine controller, a unit controller, and a load application cancellation switch. With filter regeneration being started by determination of particulate accumulation and with an idling or light-load operation being conducted, load request to a work unit is outputted from the engine controller to the unit controller. Then, when load application is not possible or the load application cancellation switch is on and, in addition, exhaust temperature is not maintainable with no load application, a regeneration stop signal is outputted from the unit controller to the engine controller and a regeneration stop signal reception process is conducted in the engine controller, and with no forced load application to a hydraulic unit, fuel addition is stopped to stop automatic regeneration control.

Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, an estimate of an amount of oil that may intrude into a deactivated cylinder is made. The deactivated cylinder may be reactivated in response to the amount of oil estimated to be in the deactivated cylinder.

An abnormality diagnosis device includes a partially-plugged filter, a pressure difference sensor, a PM sensor, a first estimation portion estimating a diagnosis amount of PM from the partially-plugged filter, according to a running condition of the internal combustion engine, a second estimation portion estimating the diagnosis amount of PM according to an output of the pressure difference sensor, a third estimation portion estimating the diagnosis amount of PM according to an output of the PM sensor, and an abnormality diagnosis portion distinctly determining an abnormality of the internal combustion engine, an abnormality of the partially-plugged filter, and an abnormality of the PM sensor by comparing the diagnosis amount of PM estimated by the first estimation portion, the diagnosis amount of PM estimated by the second estimation portion, and the diagnosis amount of PM estimated by the third estimation portion.

A control device of an internal combustion engine including an electronic control unit configured to execute: a base injection amount calculation process of calculating a base value; an injection valve operation process of operating the fuel injection valve; a feedback process of correcting an injection amount in the injection valve operation process; and a determination process of determining whether or not the amount of fuel flowing into the cylinders other than fuel injected from the fuel injection valve is equal to or larger than a threshold value. When it is determined as a result of the determination that the amount of fuel flowing into the cylinders other than the fuel injected from the fuel injection valve is equal to or larger than the threshold value, the electronic control unit (does not execute the process of injecting fuel from the fuel injection valve with the feedback process stopped.

An exhaust gas purification system for an internal combustion engine is provided with a filter including a selective catalytic reduction NOx catalyst carried thereon. Further, a post-catalyst is provided for an exhaust gas passage disposed on a downstream side from the filter. The post-catalyst has an oxidizing function, and the post-catalyst has such a function that the production of N.sub.2 based on the oxidation of ammonia is facilitated in a predetermined first temperature area. A filter regeneration process execution unit is programmed to control the temperature of the post-catalyst to be in the first temperature area while adjusting the temperature of the filter to be in a predetermined second temperature area lower than a filter regeneration temperature during a certain period of time.

A system for particulate filter regeneration includes a pre-converter universal heated exhaust gas oxygen (UHEGO) sensor disposed upstream from a three-way catalytic (TWC) converter and a particulate filter (PF), and a post-converter UHEGO sensor disposed downstream from the TWC converter and upstream from the PF. An engine controller for an internal combustion engine (ICE) and in communication with the pre-converter UHEGO sensor and the post-converter UHEGO sensor is included. The engine controller is configured to determine an amount of particulate mass accumulated in the PF during operation of the ICE and deactivate at least one of a plurality of cylinders of the ICE such that a deactivated cylinder intake air (DCIA) pass-through volume flows through the at least one deactivated cylinder and into the TWC converter and the PF. The DCIA pass-through volume is a function of the determined amount of particulate mass accumulated in the PF.

An exhaust purification system includes: a diesel oxidation catalyst (DOC) provided on an exhaust passage of an engine; a diesel particulate filter (DPF) provided on the exhaust passage at a position downstream of the DOC to collect particulate matter contained in exhaust gas; electrodes that detect a capacitance of the DOC; a particulate matter accumulation estimating unit that estimates an amount of particulate matter accumulated in the DPF on the basis of the detected capacitance; and a forced regeneration control unit that injects fuel into the DOC and performs forced regeneration that burns and removes at least the particulate matter accumulated in the DPF when the estimated accumulated particulate matter amount surpasses a predetermined amount.

Provided is a diesel engine capable of regenerating a DPF even during no-load and/or light-load operation. In a DPF regeneration process, opening-degree reduction control S2 for an exhaust-air throttle valve is performed after a start condition S1 of the regeneration process of the DPF in which PM is deposited is satisfied. When exhaust air reaches a temperature equal to or higher than a predetermined after-injection permissible temperature TA, after-injection control is subsequently started S5. Post-injection control is started S7 after the exhaust air reaches a temperature equal to or higher than a predetermined post-injection permissible temperature TP by combustion of after-injection fuel. The PM deposited in the DPF is incinerated by the exhaust air increased in temperature by catalytic combustion of post-injection fuel in a valve downstream-side DOC.

A turbocharger-equipped internal combustion engine includes an exhaust turbine, an exhaust filter, a differential pressure detector, an atmospheric pressure sensor, and an electronic control unit. The electronic control unit is configured to control the internal combustion engine such that accumulation amount of a particulate matter in the exhaust filter is regulated. The electronic control unit is configured to control the internal combustion engine such that the accumulation amount of the particulate matter in the exhaust filter is increased, when the pressure difference detected by the differential pressure detector is a lower limit or less. The electronic control unit is configured to set the lower limit such that the lower limit becomes a higher value as the atmospheric pressure detected by the atmospheric pressure sensor becomes lower.

A method for controlling a vehicle propulsion system. More particularly, the method estimates a future, upcoming driving condition and controls the vehicle propulsion system to operate the prime mover in a specific operation mode based on a determined regeneration level of a particle filter for the estimated future, upcoming driving condition.