An exhaust control system for a vehicle includes at least one temperature sensor, positioned within an exhaust system of the vehicle, that is configured to generate a measurement signal indicative of at least one of an inlet temperature and an outlet temperature of a diesel oxidation catalyst (DOC). An exhaust control module is configured to turn on an exhaust burner on to heat exhaust flowing through the exhaust system, determine a total stored heat within the DOC based in part on the measurement signal, subsequent to turning on the exhaust burner, turn off the exhaust burner based on an upper threshold of the total stored heat, and, subsequent to turning off the exhaust burner, turn on the exhaust burner based on a lower threshold of the total stored heat, wherein the lower threshold is less than the upper threshold.

A vehicle hybrid powertrain includes an internal combustion engine; an electrical drivetrain; a light-off selective catalytic reduction (LO-SCR) device coupled to receive exhaust from the internal combustion engine; and a control system that directs cylinder deactivation (CDA) of the internal combustion engine and controls heat applied to the LO-SCR device.

A vehicle exhaust system including an exhaust pipe section, a selective catalytic reduction (SCR) catalyst, and a burner assembly, connected to the exhaust pipe section at a position upstream of the selective catalytic reduction (SCR) catalyst, for pre-heating the exhaust system prior to engine start-up. The burner assembly includes a burner with a combustion chamber and a connecting tube that extends between the burner and the exhaust pipe section. A metallic mesh filter element is located inside the connecting tube and/or a catalytic washcoat is disposed on an inner surface of the connecting tube to reduce emissions of the burner assembly at start-up. The catalytic washcoat comprises a mixture of a support material and a catalyst material that chemically reacts with emissions generated by the burner to reduce the amount of burner produced emissions released from the exhaust system during pre-heating.

A controller for an aftertreatment system coupled to an engine is configured to: in response to receiving an engine shutdown signal, determine an estimated amount of ammonia stored on a selective catalytic reduction (SCR) catalyst included in the aftertreatment system; in response to determining that the estimated amount of ammonia stored in the SCR catalyst is less than an ammonia storage threshold, cause flow of a heated gas towards the SCR catalyst; cause insertion of a reductant into an exhaust gas flowing through the aftertreatment system; and in response to determining that the estimated amount of ammonia stored in the SCR catalyst is equal to or greater than the ammonia storage threshold, cause shutdown of the engine.

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 heating device for an exhaust system of an internal combustion engine and having: a tubular body, where a combustion chamber is obtained on the inside; a fuel injector, which is designed to inject fuel into the combustion chamber; at least one inlet opening, which can be connected to a fan so as to receive an air flow, which is directed to the combustion chamber; a feeding channel, which receives air from the inlet opening, surrounds an end portion of the fuel injector and ends with a nozzle, which is arranged around an injection point of the fuel injector; and a spark plug, which is mounted through a side wall of the tubular body. The feeding channel is delimited, on the outside, by an outer tubular body. The fuel injector is configured to spray at least part of the fuel against the outer tubular body, which has a through opening, through which a spray tip of the fuel injector letting out the fuel directly aims at the electrodes of the spark plug.

An exhaust-gas tract for a motor vehicle has an exhaust-gas burner that includes an air inlet connection for the introduction of air into the exhaust-gas burner. The air inlet connection has a connection piece in which a check valve for the closure of the connection piece is arranged. The air inlet connection has an air inlet flange which connects the connection piece to a combustion chamber of the exhaust-gas burner and which seals off the combustion chamber. A motor vehicle incorporates the exhaust-gas tract.

Operating an internal combustion engine (110) having at least two combustion chambers (1-6) and at least one exhaust-gas catalytic converter (130). In one example, a beginning of the load operation phase of the internal combustion engine (110) that adjoins a coasting phase is detected. A combustion chamber of the at least two combustion chambers (1-6) is determined as the first combustion chamber; and one of other the combustion chambers is selected as the purging combustion chamber. An exhaust gas of the purging combustion chamber is directed into the same exhaust-gas catalytic converter (130) as an exhaust gas of the first combustion chamber. A first fuel quantity is fed into the purging combustion chamber such that the first fuel quantity, prior to igniting the fuel in the purging combustion chamber, is discharged to be partially or fully non-combusted in the direction of the exhaust-gas catalytic convertor (130).

An emissions abatement system for an engine system having an engine and an after-treatment system is provided. The emissions abatement system is configured for operation in an off-highway vehicle and comprises a controller arranged to: receive an input indicative of an intent to start the vehicle; upon receipt of said input, activate a heating component to raise an operating temperature of at least a portion of the after-treatment system; determine when the after-treatment system has reached a first heated condition; once the first heated condition has been reached, direct the engine to be started and direct the vehicle to operate in a first mode; determine when the after-treatment system has reached a second heated condition; and once the second heated condition has been reached, direct the vehicle to operate in a second mode.

A holding device for an injection valve of an exhaust-gas burner of a motor vehicle includes a receiving section and a cooling-water jacket. The receiving section is shaped such that it can receive a front end of the injection valve. The cooling-water jacket extends around the receiving section and is shaped such that, after the holding device has been mounted on the exhaust-gas burner, the cooling-water jacket, together with a corresponding cooling-water jacket of the exhaust-gas burner, forms a cooling-water chamber of the exhaust-gas burner.