A method for engine braking of a vehicle includes: —detecting a state indicative of a desired engine braking of the vehicle, and—controlling an engine speed to a set engine speed target value by controlling a powertrain component in response to the detected state of a desired engine braking.

A method includes determining that at least one diesel emissions fluid (DEF) doser of an exhaust aftertreatment system is likely frozen based on at least one of an ambient air temperature or a DEF source temperature; operating an engine in a cylinder cutout mode in response to the determination that the at least one DEF doser is likely frozen; and, discontinuing the cylinder cutout mode in response to determining that the at least one DEF doser is in a predefined condition.

A method for diagnosing failure of a cold start E/M reduction system confirms the change in the torque reserve compared to the torque reserve confirmed for the ignition timing upon cold start by any one of an operation of an electric load device, an operation of an alternator, an operation of a purge valve, an operation of an air conditioner, a shift state of a transmission, and a coolant temperature state of an engine, and confirms the failure or normality of any one of the electric load device, the alternator, the purge valve, and the air conditioner is normal or failed using the change in the torque reserve to apply the confirmed result to determine whether the cold start E/M reduction system is abnormal, securing failure diagnosis accuracy for the components for the cold start E/M reduction.

The present disclosure describes methods for evaluating ammonia storage capacity of a close-coupled SCR unit while remaining compliant with prescribed emissions limits, methods of controlling an emission aftertreatment system including multiple SCR units and emission management systems for a vehicle including an internal combustion engine and an emission aftertreatment system that includes two or more SCR units.

The present disclosure describes methods for evaluating ammonia storage capacity of a close-coupled SCR unit while remaining compliant with prescribed emissions limits, methods of controlling an emission aftertreatment system including multiple SCR units and emission management systems for a vehicle including an internal combustion engine and an emission aftertreatment system that includes two or more SCR units.

Aspects of the present invention relate to a method and to a control system for controlling an engine and an electric traction motor of a vehicle, the control system comprising one or more controllers, wherein the control system is configured to: receive an indication of engine speed during engine idling; and control the electric traction motor to reduce a difference between the engine speed and an engine idle speed target

Systems and methods are provided for cooling an overheated engine using a combination of variable displacement engine (VDE) technology and direct injection technology. In one example, a method may include deactivating a subset of engine cylinders based on an engine temperature and directly injecting liquid fuel into the deactivated cylinders. In this way, an increased thermal conductivity of the liquid fuel compared to air decreases the engine temperature at a faster rate than when air-based engine cooling methods are used, thereby preventing overheating-related engine degradation.

A method of controlling an idle speed for an engine of a vehicle includes the steps of sensing a vehicle speed. At least one of a parking brake position and a clutch position is also sensed. When it is determined that the vehicle speed is below a maximum vehicle speed, and either the parking brake is released or the clutch is depressed, the engine idle speed is increased from a base idle speed to a launch idle speed.

A method of controlling an idle speed for an engine of a vehicle includes the steps of sensing a vehicle speed. At least one of a parking brake position and a clutch position is also sensed. When it is determined that the vehicle speed is below a maximum vehicle speed, and either the parking brake is released or the clutch is depressed, the engine idle speed is increased from a base idle speed to a launch idle speed.

A control device obtains a specification of a vehicle-mounted device which is mounted on a vehicle, and implements a control according to the specification. The vehicle-mounted device includes a transmission unit that transmits a specific signal that enables the specification of the vehicle-mounted device to be obtained. The control device includes a receiving unit which is configured to be able to receive the specific signal, and a learning unit that learns that the specification of the vehicle-mounted device is a first specification if the receiving unit does not receive the specific signal, and learns that the specification of the vehicle-mounted device is a second specification, which is different from the first specification, when the receiving unit receives the specific signal.