Diagnostic systems and methods for detecting leaks in an exhaust gas recirculation (EGR) system of an engine of a vehicle utilize an upstream oxygen (O2) sensor disposed in an exhaust system of the engine upstream from an EGR port of the EGR system and configured to measure an upstream O2 concentration of exhaust gas produced by the engine, a downstream O2 sensor disposed in the exhaust system downstream from the EGR port and configured to measure a downstream O2 concentration of the exhaust gas, and a controller configured to receive the measured upstream and downstream O2 concentrations from the upstream and downstream O2 sensors, respectively, and detect a leak in the EGR system when a difference between the measured downstream and upstream O2 concentrations exceeds a diagnostic threshold.

A control device for an internal combustion engine includes processing circuitry. The processing circuitry is configured to execute a purging process that draws the fuel vapor trapped in the canister into the intake passage by controlling the purge valve, a fuel feeding process that feeds the air-fuel mixture, which includes the fuel supplied to the cylinder, to the exhaust passage without burning the air-fuel mixture in the cylinder, and a fuel supply process that supplies fuel to the cylinder when the fuel feeding process is being performed. The processing circuitry is further configured to perform the fuel supply process by performing the purging process.

A working machine includes a manual switch, a filter to catch particulate matters included in exhaust gas that is exhausted from a prime mover, a first cleaning controller to perform automatic cleaning that automatically combusts the particulate matters when a deposits amount of the particulate matters caught by the filter is a first deposits amount threshold or more, a second cleaning controller to perform manual cleaning that combusts the particulate matters based on a command of the manual switch when the deposits amount is equal to or more than a second deposits amount threshold that is larger than the first deposits amount threshold, and a third cleaning controller to perform assist cleaning that combusts the particulate matters based on the command of the manual switch when the deposits amount is equal to or more than the first deposits amount threshold and smaller than the second deposits amount threshold.

A method for regenerating an Otto particle filter of an internal combustion engine of a vehicle includes identifying a loading state of the Otto particle filter above a regeneration threshold and operating the internal combustion engine in a heating mode for the purposes of heating the Otto particle filter to a temperature threshold. The method further includes switching a first cylinder of the internal combustion engine from a fuel supply to an air supply, and continuing to operate at least one further cylinder of the internal combustion engine with the fuel supply.

An object of the present invention is to provide an exhaust gas purification system which exhibits high exhaust gas purification performance. The present invention provides an exhaust gas purification system including: a carrier containing aluminum oxide; an exhaust gas purification device including a catalyst provided on the carrier and containing gallium, and connected to an internal combustion engine; and a system connected to the exhaust gas purification device for increasing an oxygen concentration. The system for increasing an oxygen concentration provides an oxygen concentration higher than that of a post combusted gas of the internal combustion engine.

A method of controlling light-off of a catalytic converter in an exhaust system of an internal combustion engine (ICE) includes identifying a start of the ICE requiring a light-off of the catalytic converter. The method also includes regulating an exhaust-flow control valve to increase exhaust gas backpressure in the exhaust system in response to the identified start of the ICE. The method additionally includes regulating combustion inside the ICE to increase enthalpy of the ICE. The method also includes detecting light-off of the catalytic converter. The method additionally includes regulating the exhaust-flow control valve to decrease the exhaust gas backpressure in the exhaust system in response to the catalytic converter light-off. Furthermore, the method includes regulating combustion inside the ICE to decrease ICE enthalpy in response to the catalytic converter light-off. The method may be embodied in an algorithm programmed in an electronic controller of a motor vehicle.

Methods and systems are provided for regenerating an after-treatment system of a vehicle. A first operational parameter of a first component of the after-treatment system is monitored and a second operational parameter, different to the first operational parameter, of a second component of the after-treatment system is monitored. It is determined if the first operational parameter of the first component is outside a first threshold range and if the second operational parameter is approaching a second threshold and, in response to the first operational parameter being outside the first threshold range and the second operational parameter being within the second threshold range, a regeneration sequence of the after-treatment system configured to regenerate at least the first component of the after-treatment system is initiated.

Methods and systems for operating an engine during and after regeneration of a particulate filter are described. In one example, exhaust flow is increased and exhaust temperature is decreased in response to ceasing regeneration of a particulate filter so that SCR efficiency may be improved in a short amount of time.

A motor vehicle including an exhaust system downstream of an internal combustion engine and which comprises several exhaust gas aftertreatment devices for cleaning the exhaust gas from the internal combustion engine, wherein the exhaust system includes an SCR catalytic converter and at least one additional catalytic converter, wherein the additional catalytic converter is designed as an NOx storage catalytic converter or an oxidation catalytic converter, wherein a control device is provided for controlling at least one operating component of the motor vehicle influencing the temperature of the exhaust gas, wherein the control device is designed to control the operating component for setting the temperature of the exhaust gas depending on at least route information dependent on an expected travel distance and conversion information relating to a temperature-dependent pollutant conversion rate of at least one exhaust gas aftertreatment device of the exhaust system.

A vehicle and method reduce heating of a particulate filter during a regeneration event in response to an accelerator pedal tip-out and particulate filter temperature exceeding or anticipated to exceed a threshold by fueling the engine to reduce oxygen in the exhaust flowing to the particulate filter. An electric machine may be operated as a generator charging a battery to compensate or offset torque produced by the fueling of the engine. The current or anticipated particulate filter temperature may be estimated by a soot combustion model for a current regeneration event and/or a future regeneration event based on soot loading of the particulate filter.