An exhaust purification system includes a filter, an oxygen supply device, and a controller. The filter is configured to trap particulate matters contained in exhaust gas of an engine. The oxygen supply device is configured to supply oxygen contained in intake air of the engine to the filter. The controller is configured to execute filter regeneration processing to oxidize and remove the particulate matters deposited on the filter. The filter regeneration processing includes regeneration processing during an engine stop that is executed during a shut-down of the engine. In the regeneration processing during the engine stop, a future temperature of the filter is calculated. Then, an operation amount of the oxygen supply device is variably set based on a result of comparing the future temperature with an upper limit temperature of the filter.

An exhaust treatment device for a diesel engine includes a parked regeneration requirement notification component, and a parked regeneration start operation component, a regeneration process of a diesel particulate filter includes an automatic regeneration process and a parked regeneration process, the automatic regeneration process is automatically started when an estimation value of particulate material accumulated in the diesel particulate filter reaches a predetermined value, and the parked regeneration process is performed when first and second conditions are satisfied, the first condition being that a parked regeneration requirement notification component performs a notification of a parked regeneration requirement when a number of cancellations of the automatic regeneration process reaches a predetermined value or more, the second condition being that the parked regeneration start operation component is subjected to a start operation during a parked state in which an engine equipped machine is neither traveling nor working.

A vehicle includes a filter disposed in an exhaust passage through which exhaust gas discharged from an internal combustion engine passes, the filter being configured to collect PM that is particulate matter contained in the exhaust gas; a PM removal control device configured to start execution of PM removal control that heats the filter to remove the PM accumulated on the filter while the internal combustion engine is stopped; and a determination device configured to determine whether a user of the vehicle is away from the vehicle. The PM removal control device is configured to start the execution of the PM removal control only when the determination device determines that the user of the vehicle is away from the vehicle.

When a user requests start-up of an internal combustion engine while PM removal control is in execution or immediately after execution of the PM removal control is completed, an electronic control unit informs the user of the vehicle of a first alarm, so that the user recognizes that the internal combustion engine cannot be started up immediately. This makes it possible to suppress the discomfort caused because the internal combustion engine is not started up.

Methods and systems are provided for monitoring a change in exhaust particulate filter (PF) soot load during an engine non-combusting condition. In one example, a method may include, responsive to a higher than threshold PF temperature immediately prior to an engine shutdown, estimating a rate of soot burn when the engine is no longer combusting, and estimating a soot load on the PF during and at an onset of immediately subsequent engine start based in part on the rate of soot burn.

Methods and systems are provided for filtering particulate matter in an exhaust passage of an engine system. In one example, a method may include during a cold start condition comprising an engine temperature being less than a threshold engine temperature, directing engine exhaust gas to an exhaust particulate filter, and during a warm engine condition, directing engine exhaust gas to bypass the exhaust particulate filter, wherein the warm engine condition comprises the engine temperature being greater than or equal to the threshold engine temperature and fuel being combusted in the engine. In this way, the exhaust particulate filter may be reliably regenerated during engine shutdown events such as DFSOs while reducing filter degradation, and lowering PM emissions.

A controller for a vehicle includes a combustion stoppage period processor and a combustion period processor. The combustion stoppage period processor is configured to selectively execute one of a fuel cut process or a fuel feeding process when stopping combustion in the cylinder in a situation in which a crankshaft of the internal combustion engine is rotating. The combustion period processor is configured to execute an increase process that increases flow speed of exhaust gas in the exhaust pipe when the fuel feeding process is executed while combustion is stopped in the cylinder and then combustion is resumed in the cylinder in which the combustion has been stopped.

Methods and systems are provided for monitoring a change in exhaust particulate filter (PF) soot load during an engine non-combusting condition. In one example, a method may include, responsive to a higher than threshold PF temperature immediately prior to an engine shutdown, estimating a rate of soot burn when the engine is no longer combusting, and estimating a soot load on the PF during and at an onset of immediately subsequent engine start based in part on the rate of soot burn.

Methods and systems are provided for regenerating an exhaust particulate filter during an engine non-combusting condition. In one example, a method may include, responsive to a higher than first threshold soot load on the PF and a higher than threshold PF temperature, regenerating the PF by flowing compressed air through the PF via operation of an electric booster coupled to the intake manifold.

A method for regenerating a particulate filter (30) that is arranged in the exhaust train of an internal combustion engine (12) of a vehicle. The vehicle has a drive train (10) with the internal combustion engine (12) and a clutch unit (18), and the clutch unit (18) connects the internal combustion engine (12) in a separable manner to a transmission (20). The method includes switching off the internal combustion engine (12), and closing the clutch unit (18) with a slip.