A method for operating a motor vehicle having an engine and an electric machine, a transmission, a battery, and an exhaust treatment system having a particulate filter. The battery discharges during a charge-depleting mode of the electrical machine and charges when the electrical machine operates as a generator such that the battery charge state moves between lower and upper limits. If a filter regeneration requirement is detected, the filter is regenerated by raising the temperature of the exhaust gas. When the need for filter regeneration is detected, the battery is discharged to below the lower limit, in the charge-depleting mode of the electrical machine, prior to the regeneration. Subsequently, to regenerate the filter, the engine is operated to raise the exhaust gas temperature by increasing the torque provided by the engine, and the electric machine operates as a generator to charge the battery and/or operate an auxiliary electrical load.

A vehicle includes a combustion engine configured to output mechanical power and an electric machine coupled to the engine and configured to convert the mechanical power to electrical power. The vehicle also includes a battery to exchange electrical power with the electric machine. The vehicle further includes a controller programmed to receive user inputs indicative of a desired storage duration and a storage location and monitor a battery state of charge (SOC) while the vehicle is stored. The controller is also programmed to prompt a remote user to approve an engine auto-start in response to the SOC depleting to less than a predetermined threshold during storage, and to auto-start the engine to generate power to recharge the battery in response to remote user approval. The controller is further programmed to inhibit the auto-start of the engine in response to the vehicle being stored in an enclosed storage location.

A controller for a hybrid electric vehicle includes processing circuitry configured to execute a manual filter regeneration process when satisfying a condition including that execution of the manual filter regeneration process is requested to decrease a PM deposit amount on the filter and that the hybrid electric vehicle is in a stopped state. In the manual filter regeneration process, when a state of charge of the battery becomes less than a discharge threshold value, an output of an internal combustion engine is converted to electric power for charging the battery while the filter is supplied with oxygen from the engine. Further, when the state of charge of the battery becomes greater than or equal to a charge threshold value that is greater than or equal to the discharge threshold value, an output shaft of the engine is rotated with the motor to supply the filter with oxygen from the engine.

A method of operating an engine is provided. An exhaust valve actuation fault is detected for a first exhaust valve associated with a first cylinder during a first working cycle. In response to the detection of the exhaust valve actuation fault, fueling to at least the first cylinder is cut off. Actuation of the first exhaust valve is attempted in second working cycles that follow the first working cycle, wherein the second working cycles are not fueled. Whether or not the first exhaust valve actuated properly during the second working cycles is determined. Operation of the first cylinder is resumed when it is determined that the first exhaust valve actuated properly. Operation of the first cylinder is not resumed when it is determined that the first exhaust valve did not actuate properly.

Methods and systems for operating an engine with an electrically heated catalyst and an electrically driven compressor are described. In one example, the electrically driven compressor and the electrically heated catalyst are activated before an engine start so that vehicle emissions may be reduced more efficiently at engine starting and thereafter.

Systems, devices, methods and programs for reducing emissions from engines are provided. For example, one system for reducing emissions from engines comprises a heating controller coupled to an energy storage device (ESD). The heating controller is configured to control a heating element to heat one or more components of an after-treatment system using energy from the ESD under a first condition and to control the heating element to stop heating the one or more components of the after-treatment system when a second condition is satisfied. Additionally, another system for reducing emissions from engines comprises a controller detecting a decrease in a demanded torque from an engine and an ISG. The controller is then configured to operate a clutch to disengage the engine from the ISG, if after removing fuel from the engine, the sensed speed of the engine is above a threshold.

Methods and systems are provided for controlling engine operation in a hybrid electric vehicle equipped with stop/start capabilities under conditions where requested power or torque is in a hysteresis region between an engine pull up threshold and an engine pull down threshold. In one example, a method comprises obtaining an adjusted engine pull down threshold upon the requested power or torque remaining in the hysteresis region for more than a threshold duration, and commanding the engine deactivated in response to the adjusted engine pull down threshold being equivalent to the requested power or torque. In this way, a motor/generator may be used to meet the requested torque response rather than the engine under such conditions, which may improve fuel economy.

A method for controlling starting of a mild hybrid vehicle includes receiving a starting-request signal and in response, increasing a rotation speed of the engine by driving the MHSG by electricity supplied from a battery. Status data of the mild hybrid vehicle for controlling starting of the engine is monitored to obtain an engine rotation speed from the status data and determine an injection-starting rotation speed based on the status data. When the engine rotation speed is greater than the injection-starting rotation speed, fuel injection of the engine is started.

A method and apparatus for controlling part load mode engine torque are provided. The method includes setting a limitation of part load mode engine torque based on a current traveling environment and calculating a first engine torque variation in the basis of state information of a battery. When the first engine torque variation is calculated, a second engine torque variation is calculated based on a measured engine error amount. The limitation of part load mode engine torque is compensated based on the calculated first and second engine torque variations.

A system for emissions mitigation for a hybrid automobile vehicle includes an automobile vehicle provided with motive power from: a battery pack; an engine; and a controller in communication with the battery pack and the engine. A threshold battery pack state-of-charge (SOC) is predetermined. A minimum battery pack SOC is less than the threshold battery pack SOC. An engine-on charge depletion (EOCD) command is issued by the controller to start the engine in an engine-catalyst light-off operation condition when the vehicle is operating using power from the battery pack and when the threshold battery pack state-of-charge (SOC) is reached to mitigate against exceeding vehicle emissions standards.