An aftertreatment device of a vehicle exhaust system includes an aftertreatment device. The aftertreatment device includes a body defining an inlet cone, an outlet cone, and a cavity therebetween. A heating element is disposed in the cavity. A catalyst is disposed in the cavity downstream of the heating element. A recirculation loop has a conduit with a first end connected to the outlet cone and a second end connected to the inlet cone. The recirculation loop further has an air-circulation device configured to recirculate heated air from the outlet cone to the inlet cone.

A start-up method for heating a selective catalytic reduction (SCR) module in a hybrid propulsion system of a vehicle. An internal combustion engine is in fluid communication with an exhaust aftertreatment system having an exhaust. An SCR module is disposed in the exhaust passage downstream of the engine and an electric motor. The method includes operating the engine in a start-up mode with a torque restriction on the engine, allowing the SCR module to convert NOx emission; supplying a surplus amount of a reducing agent to the exhaust gas at a position between the engine and the SCR module, the surplus amount of the reducing agent being larger than a required amount of reducing agent for converting NOx emission from the engine; heating said SCR module to a working temperature; and terminating the start-up mode.

A control method, a control device, an electronic device and a storage medium for engine operation are provided. The method includes: obtaining a rotational speed and a temperature of an engine at a current time and determining a reference value of the control parameter of the engine based on the rotational speed and the temperature; detecting a composite operating state of the engine at the current time and determining an offset of the control parameter corresponding to each operating state in the composite operating state; adding the reference value of the control parameter and the offset of the control parameter corresponding to each operating state in the composite operating state to obtain a final value of the control parameter; and controlling the engine at the current time according to the final value of the control parameter.

A fuel injection control apparatus including a microprocessor. The microprocessor is configured to perform calculating a target injection time, determining a first crank angle defining a start of fuel injection and a second crank angle defining an end of fuel injection, controlling a fuel injector in an injection start priority mode in which the fuel is injected for the first target injection time from a first time point corresponding to the first crank angle or an injection end priority mode in which the fuel is injected for the second target injection time from a second time point corresponding to a target crank angle, and the controlling including controlling the fuel injector so as to inject the fuel in the injection start priority mode or the injection end priority mode in accordance with an injection mode.

A method for operating an internal combustion engine, which comprises a combustion unit, a generator coupled with the combustion unit, a fresh gas tract, an exhaust tract, an exhaust gas recirculation line, which branches off of the exhaust tract and opens into the fresh gas tract, and at least one electrical heating device, which is integrated into the exhaust tract or into the exhaust gas recirculation line, characterized in that, during an overrun mode of the combustion unit, the heating device is operated with energy provided by the generator, and exhaust gas heated with the aid of the heating device is partially or completely guided via the exhaust gas recirculation line.

A system includes an aftertreatment system coupled to an engine, a heater, at least one sensor configured to determine an exhaust gas temperature, and a processing circuit. The processing circuit is structured to determine whether the exhaust gas temperature is at or below a predefined threshold temperature; provide a first command to control the heater in response to the exhaust gas temperature being at or below the predefined threshold temperature; selectively provide a second command to increase the exhaust gas temperature; and coordinate the first and second commands, where the first command is provided followed by the second command only if the predefined threshold temperature is not attained by the first command.

A system and method for a variable displacement internal combustion engine using different types of pneumatic cylinder springs on skipped working cycles to control engine and aftertreatment system temperatures are described. The system and method may be used to rapidly heat up the aftertreatment system(s) and/or an engine block of the engine following a cold start by using one or more different types of pneumatic cylinder springs during skipped firing opportunities. By rapidly heating the aftertreatment system(s) and/or engine block, noxious emissions such as hydrocarbons, carbon monoxide, NO.sub.x and/or particulates, following cold starts are significantly reduced.

System and methods are described for optimizing exhaust flow rate and temperature during specified operational periods warm-up and keep-warm conditions, by minimizing or maximizing heat flux during those specified operational periods.

A control device includes a drive unit configured to supply electric power to a fuel injection valve to perform valve open drive to supply fuel to a combustion chamber of an internal combustion engine; and a correction unit configured to correct a fuel injection amount of the fuel injection valve. The correction unit is configured to learn the fuel injection amount of the fuel injection valve when NOx purge is performed to reduce and purify the NOx occlusion catalyst.

A system and method for a variable displacement internal combustion engine using different types of pneumatic cylinder springs on skipped working cycles to control engine and aftertreatment system temperatures are described. The system and method may be used to rapidly heat up the aftertreatment system(s) and/or an engine block of the engine following a cold start by using one or more different types of pneumatic cylinder springs during skipped firing opportunities. By rapidly heating the aftertreatment system(s) and/or engine block, noxious emissions such as hydrocarbons, carbon monoxide, NO.sub.x and/or particulates, following cold starts are significantly reduced.