A method and a unit for operating or for the operation of a fuel metering system of an internal combustion engine, in particular in a motor vehicle, and it being provided, in particular, that at least one operating variable of the internal combustion engine is detected, a dynamic operating state of the internal combustion engine is detected based on the at least one detected operating variable, and a dynamic correction to the fuel metering system of the internal combustion engine is carried out for a detected dynamic operating state of the internal combustion engine, taking into account the efficiency of an NOx exhaust gas aftertreatment system.

The disclosure relates to a method and a device for checking the functionality of a crankcase ventilation system of an internal combustion engine. The crankcase ventilation system includes two crankcase ventilation lines arranged between a crankcase outlet of a crankcase and an associated introduction point into an air path of the internal combustion engine, via which crankcase ventilation lines gas can be introduced from the crankcase into the air path. The method includes measuring a pressure in the crankcase, supplying the measured pressure values to a control unit, and calculating the gradient of the measured pressure. The method also includes performing a gradient check, checking whether the gradient satisfies a specified criterion, and returning to the measurement of the pressure if the gradient satisfies the specified criterion. The method also includes recording an entry in a fault memory if the gradient does not satisfy the specified criterion.

In an opposed-piston engine which includes a catalytic aftertreatment device in its exhaust system an exhaust gas condition indicating a catalyst temperature of the aftertreatment device is monitored. When the catalyst temperature is near or below a light-off temperature, a catalyst light-off procedure is executed to elevate the temperature of the catalyst.

Methods and systems are provided for identifying degradation of active engine mounts coupled to a vehicle engine. By correlating the monitored vibrational pattern to a selected active mounts operating mode, the conditions of active engine mounts may be distinguished. Timely diagnosis of active engine mounts may improve active engine mount health and prevent noise, vibration, and harshness (NVH) issues.

A vehicle includes an engine. The vehicle includes a controller configured to start a timer having a duration defined by a charge limit of a traction battery and during which the engine braking is maintained and reduce a predetermined rate of change speed limit of the engine is reduced. The starting of the timer is responsive to application of an accelerator pedal during engine braking. The controller is further configured to increase the predetermined rate of change speed limit such that engine braking is predicted based on the limit of the battery, responsive to application of an accelerator pedal during engine braking.

A control system of an engine including a cylinder, an intake passage, and an exhaust passage is provided, that includes a fuel injector for injecting fuel into the cylinder, an exhaust gas recirculation (EGR) passage communicating the intake passage with the exhaust passage and for recirculating, as EGR gas, a portion of exhaust gas in the exhaust passage back to the cylinder, an EGR valve capable of controlling an EGR ratio by changing an EGR gas amount recirculated to the cylinder, a water injector for injecting water into the cylinder, and a controller. The controller controls the EGR valve to set a target EGR ratio according to an engine operating state so as to bring an actual EGR ratio to the target EGR ratio, and when the target EGR ratio is increased, the controller controls the water injector to increase an amount of the water injected into the cylinder.

A vehicle includes an engine. The vehicle includes a controller configured to start a timer having a duration defined by a charge limit of a traction battery and during which the engine braking is maintained and reduce a predetermined rate of change speed limit of the engine is reduced. The starting of the timer is responsive to application of an accelerator pedal during engine braking. The controller is further configured to increase the predetermined rate of change speed limit such that engine braking is predicted based on the limit of the battery, responsive to application of an accelerator pedal during engine braking.

In various aspects, internal combustion engines, engine controllers and methods of controlling engines are described. The engine includes a camshaft and a two cylinder sets. Cylinders in the first are deactivatable and cylinders in the second set may be fired at high or low output levels. The air charge for each fired working cycle is set based on whether a high or low torque output is selected. In some implementations, the camshaft is axially shiftable between first and second positions. First cam lobes are configured to cause their associated cylinders to intake a large air charge during intake strokes that occur when the camshaft is in the first position. Second cam lobes for cylinders in the second set cause their associated cylinders to intake a smaller air charge when the camshaft is in the second position. Second cam lobes for cylinders in the first set deactivate their associated cylinders.

A control system and method for a vehicle having a powertrain comprising a torque generating system and an automatic transmission each utilize a pedal position sensor configured to measure a position of an accelerator pedal of the vehicle and a controller configured to, based on the accelerator pedal position, detect a pedal tip-in or tip-out event and, in response to detecting the pedal tip-in or tip-out event: (i) determine a desired output torque for the torque generating system corresponding to the pedal tip-in or tip-out event and (ii) command the torque generating system to gradually transition, over a period, from its current output torque to the desired output torque to mitigate clunk caused by abrupt contact between gear teeth of the torque generating system shaft and the automatic transmission shaft.

A target first air amount for achieving a requested torque by an operation of an intake property variable actuator is calculated by using a first parameter. A target second air amount for achieving the requested torque by an operation of a turbocharging property variable actuator is calculated by using a second parameter. A value of a first parameter changes to a value that reduces a conversion efficiency of an air amount into torque in response to the requested torque decreasing to a first reference value or lower. Further, a value of the second parameter starts to change to a direction to reduce the conversion efficiency in response to the requested torque decreasing to a second reference value that is larger than the first reference value, or lower, and gradually changes to a direction to reduce the conversion efficiency in accordance with the requested torque further decreasing from the second reference value to the first reference value. The target air-fuel ratio is set at a first air-fuel ratio in a period in which the requested torque is larger than the first reference value, and is switched to a second air-fuel ratio which is leaner than the first air-fuel ratio in response to a decrease of the requested torque to the first reference value or lower.