An exhaust purification system may include at least one catalyst in an exhaust flow path of an internal combustion engine to decrease gaseous pollutants from an exhaust gas, a first particulate filter downstream of the catalyst, and a second particulate filter with a porosity lower and a lower mean pore size than the first particulate filter and in a bypass flow line downstream of the first particulate filter, the bypass flow line being configured to open and close based on at least one condition of the exhaust purification system or conditions of the exhaust gas. The second particulate filter may be configured to be removed and replaced when full. A method of purifying an exhaust gas through the exhaust purification system is also described.

An exhaust aftertreatment system for increasing fractional efficiency of diesel or gasoline particulate filters includes a particulate filter that includes a housing and a filter substrate positioned in the housing. The filter substrate is pre-conditioned with an aqueous solution or suspension configured to decompose or evaporate in response to exposure to heat so as to precondition the filter substrate.

A structure of a metal fiber constituting a filter is set to a structure in which a cross-sectional shape of the metal fiber is a curved or bent shape and an outer member and an inner member having a linear expansion coefficient greater than that of the outer member are bonded to each other. Accordingly, the metal fiber is deformed to warp to the outer member side in the length direction thereof when the temperature of the metal fiber increases. When a amount of deformation per unit temperature of the metal fiber is defined as a deformation rate, a amount of change of the deformation rate per unit time changes at a predetermined deformation temperature with the increase in temperature. The deformation temperature is set to a temperature higher than a target temperature of a filter regenerating process.

The exhaust purification system of an internal combustion engine includes a filter trapping particulate matter in exhaust gas flowing through an exhaust passage of the internal combustion engine and supporting a three-way catalyst, and a filter regeneration part configured to perform regeneration processing for oxidizing and removing particulate matter deposited on the filter when predetermined conditions are satisfied. The filter regeneration part is configured to increase an NO concentration in exhaust gas flowing into the filter when the predetermined conditions are satisfied compared to when the predetermined conditions are not satisfied.

An exhaust aftertreatment system for increasing fractional efficiency of diesel or gasoline particulate filters includes a particulate filter that includes a housing and a filter substrate positioned in the housing. The filter substrate is pre-conditioned with an aqueous solution or suspension configured to decompose or evaporate in response to exposure to heat so as to precondition the filter substrate.

In a method for operating an internal combustion engine of a motor vehicle, exhaust gas from the internal combustion engine is fed to a particulate filter of the motor vehicle. Until a predetermined filtration rate of the particulate filter is reached, a temporary interruption of a fuel supply to the internal combustion engine is prevented in an overrun mode of the motor vehicle if a temperature of the exhaust gas in the particulate filter is greater than a predetermined threshold value of the temperature. An arrangement of the particulate filter in an exhaust system of the motor vehicle is also described.

An exhaust aftertreatment system for increasing fractional efficiency of diesel or gasoline particulate filters includes a particulate filter that includes a housing and a filter substrate positioned in the housing. The filter substrate is pre-conditioned with an aqueous solution or suspension configured to decompose or evaporate in response to exposure to heat so as to precondition the filter substrate.

Methods, systems, and devices for particulate filter soot management for internal combustion engines are described herein. A method for particulate filter soot management for internal combustion engines includes determining a quantity of soot on a particulate filter and adjusting a skip fire firing sequence based at least in part on maintaining the quantity of soot on the particulate filter within a desired soot quantity range.

Systems, methods, assemblies, and components for aftertreatment of an engine can comprise an aftertreatment module including an exhaust enclosure with at least one inlet port to receive exhaust gas, an outlet port to output exhaust gas, a first compartment, and a second compartment; a plurality of particulate filters extending in parallel with each other within the exhaust enclosure such that, for each of the particulate filters, an inlet of the particulate filter is in the first compartment and an outlet of the particulate filter is in the second compartment; and at least one radio frequency (RF) sensor set including an RF transmitter assembly and an RF receiver assembly. The RF transmitter assembly can be provided in the first compartment at the inlet of one of the particulate filters, and the RF receiver assembly can be provided at the outlet of said one particulate filter.

An exhaust aftertreatment system for increasing fractional efficiency of diesel or gasoline particulate filters includes a particulate filter that includes a housing and a filter substrate positioned in the housing. The filter substrate is pre-conditioned with an aqueous solution or suspension configured to decompose or evaporate in response to exposure to heat so as to precondition the filter substrate.