A method for controlling a hybrid vehicle propulsion system that includes an internal combustion engine and an exhaust after treatment device for treating exhaust gases from the engine includes determining during operation of the vehicle a value of a parameter indicative of an efficiency of the exhaust after treatment device, identifying a vehicle operation cycle start event, determining during the operation of the vehicle an engine operation history characteristic for a time interval after the vehicle operation cycle start event, and determining whether or not to control the propulsion system so as to increase the efficiency of the exhaust after treatment device, in dependence on the determined exhaust after treatment device efficiency parameter value and the determined engine operation history characteristic.

Methods and systems are provided for reducing carbon buildup in an exhaust gas recirculation system of an engine of a vehicle. In one example, a method comprises injecting a diesel exhaust fluid into an intake manifold of the engine, routing the diesel exhaust fluid into the exhaust gas recirculation system, and vaporizing the diesel exhaust fluid in the exhaust gas recirculation system. In this way, any carbon deposits associated with an exhaust gas recirculation valve and/or exhaust gas recirculation passage may be reduced, which may increase fuel economy and may reduce undesired emissions.

It is provided a control device for a hybrid vehicle including a controller configured to control an engine, a first motor, and an automatic transmission and a control method of the hybrid vehicle. The controller is configured to determine whether or not an operation state of the engine is changeable, when an upshift of the hybrid vehicle is performed, decrease torque of an input shaft of the automatic transmission by outputting negative torque acting to decrease the torque of the input shaft of the automatic transmission from the first motor when a prohibition condition that the operation state of the engine is not changeable is established, and decrease engine torque output from the engine to decrease the torque of the input shaft of the automatic transmission to be decreased accompanied by the upshift when the prohibition condition is not established and the operation state of the engine is changeable.

A method for exhaust gas aftertreatment in a hybrid machine comprising at least one electric motor (2) and one internal combustion engine (3) is disclosed, wherein the method comprises operating the hybrid machine in a first operating mode in which only the electric motor (2) is switched on and an internal combustion engine (3) is switched off; determining whether heating of an exhaust gas aftertreatment system (20) of the hybrid machine is required; and, if heating is required, at least temporarily activating the internal combustion engine (3) for the purpose of heating the exhaust gas aftertreatment system (20).

A method for operating a drive train of a motor vehicle having a combustion engine and a further machine, the two drives proportionally supplying a torque for the motor vehicle, and a temperature of an exhaust gas of the motor vehicle is ascertained and the shares of the generated torque by the combustion engine and the further machine are adapted as a function of the temperature of the exhaust gas.

A vehicle includes an internal combustion engine, a catalyst provided in an exhaust passage of the internal combustion engine, and an electronic control unit. The electronic control unit is configured to control an engine torque such that a first torque change amount of the engine torque when the temperature of the catalyst belongs to a predetermined low temperature region to be lower than a second torque change amount of the engine torque when the temperature of the catalyst belongs to a high temperature region. The high temperature region is a region having a temperature higher than the low temperature region.

A system and method to implement a torque handoff between and electric machine and an internal combustion engine in a motor vehicle are provided. To implement the torque handoff without undue delay, temperature of the exhaust gas is taken into consideration to determine whether an emissions stability criterium is met for handing off torque, and if the emissions stability criterium is met, the system and method are configured to handoff torque from the electric machine to the internal combustion engine. When the exhaust gas is sufficiently warm, it may be determined that the engine is operating with sufficiently low levels of hydrocarbons in accordance with emissions regulations, such that torque handoff may be made with confidence of maintaining emissions standards.

A mild hybrid vehicle controlling method, wherein the mild hybrid vehicle has a driver assistance module for detecting peripheral vehicle information and a mild hybrid starter & generator (MSHG) may comprises comparing, by a controller, the peripheral vehicle information with a predetermined reference value and deciding whether after-treatment regeneration control is performed or not according to a result of the comparison.

An exhaust-gas purification system and method controls an internal combustion engine having at least one cylinder-piston unit operating in a overrun (drag) mode in which piston motion is induced by motion of an output shaft of a drive output unit associated with the internal combustion engine. A control device controls, for each of cylinder-piston unit, an intake fluid, an exhaust valve and fuel injection to heat an exhaust emission control device by deactivating fuel injection, passing the substantially fuel-free intake fluid into the cylinder, compressing and thereby heating the fluid in the cylinder, and passing the heated outlet fluid to the exhaust emission control device. The control device may control the amount of heating based on measurement and/or use of a temperature model of the exhaust emission control device.

A hybrid vehicle including: an engine; a motor; a power storage device; and a control device configured to: i) automatically start and stop the engine; ii) execute, in a current trip, a power storage capacity decreasing control of controlling the engine and the motor such that a power storage capacity of the power storage device in a case where the hybrid vehicle is predicted to be parked at a predetermined point is lower than that in a case where the hybrid vehicle is predicted to not be parked at the predetermined point, and execute, in a next trip, a power storage capacity recovering control; and iii) limit execution of the power storage capacity decreasing control when the hybrid vehicle is predicted to be parked at the predetermined point is predicted and a stopping prohibiting condition for the engine is satisfied.