The present invention describes a fuel-management system for minimizing particulate emissions in turbocharged direct injection gasoline engines. The system optimizes the use of port fuel injection (PFI) in combination with direct injection (DI), particularly in cold start and other transient conditions. In the present invention, the use of these control systems together with other control systems for increasing the effectiveness of port fuel injector use and for reducing particulate emissions from turbocharged direct injection engines is described. Particular attention is given to reducing particulate emissions that occur during cold start and transient conditions since a substantial fraction of the particulate emissions during a drive cycle occur at these times. Further optimization of the fuel management system for these conditions is important for reducing drive cycle emissions.

The present invention describes a fuel-management system for minimizing particulate emissions in turbocharged direct injection gasoline engines. The system optimizes the use of port fuel injection (PFI) in combination with direct injection (DI), particularly in cold start and other transient conditions. In the present invention, the use of these control systems together with other control systems for increasing the effectiveness of port fuel injector use and for reducing particulate emissions from turbocharged direct injection engines is described. Particular attention is given to reducing particulate emissions that occur during cold start and transient conditions since a substantial fraction of the particulate emissions during a drive cycle occur at these times. Further optimization of the fuel management system for these conditions is important for reducing drive cycle emissions.

The present invention describes a fuel-management system for minimizing particulate emissions in turbocharged direct injection gasoline engines. The system optimizes the use of port fuel injection (PFI) in combination with direct injection (DI), particularly in cold start and other transient conditions. In the present invention, the use of these control systems together with other control systems for increasing the effectiveness of port fuel injector use and for reducing particulate emissions from turbocharged direct injection engines is described. Particular attention is given to reducing particulate emissions that occur during cold start and transient conditions since a substantial fraction of the particulate emissions during a drive cycle occur at these times. Further optimization of the fuel management system for these conditions is important for reducing drive cycle emissions.

The present invention describes a fuel-management system for minimizing particulate emissions in turbocharged direct injection gasoline engines. The system optimizes the use of port fuel injection (PFI) in combination with direct injection (DI), particularly in cold start and other transient conditions. In the present invention, the use of these control systems together with other control systems for increasing the effectiveness of port fuel injector use and for reducing particulate emissions from turbocharged direct injection engines is described. Particular attention is given to reducing particulate emissions that occur during cold start and transient conditions since a substantial fraction of the particulate emissions during a drive cycle occur at these times. Further optimization of the fuel management system for these conditions is important for reducing drive cycle emissions.

The present invention describes a fuel-management system for minimizing particulate emissions in turbocharged direct injection gasoline engines. The system optimizes the use of port fuel injection (PFI) in combination with direct injection (DI), particularly in cold start and other transient conditions. In the present invention, the use of these control systems together with other control systems for increasing the effectiveness of port fuel injector use and for reducing particulate emissions from turbocharged direct injection engines is described. Particular attention is given to reducing particulate emissions that occur during cold start and transient conditions since a substantial fraction of the particulate emissions during a drive cycle occur at these times. Further optimization of the fuel management system for these conditions is important for reducing drive cycle emissions.

Methods and systems are provided for an engine configured to deactivate at least some cylinders. In one example, an engine system may comprise a first group of cylinders having a first compression ratio and a second group of cylinders having a second compression ratio greater than the first.

An internal combustion engine has a combustion chamber, an intake tract through which air can flow, a first tank for a liquid spark-ignition fuel, a second tank for water, a mixing region, in which the spark-ignition fuel from the first tank is to be mixed with the water from the second tank thereby creating a mixture having the spark-ignition fuel and the water, an injection valve which is allocated to the combustion chamber and by which the mixture can be injected directly into the combustion chamber, and a second injection valve which is allocated to the combustion chamber and provided in addition to the injection valve and by which in relation to the water and the spark-injection fuel, only the spark-injection fuel from the first tank can be injected at a location upstream of the combustion chamber into the intake tract and thus into the air flowing through the intake tract.

An internal combustion engine has a combustion chamber, an intake tract through which air can flow, a first tank for a liquid spark-ignition fuel, a second tank for water, a mixing region, in which the spark-ignition fuel from the first tank is to be mixed with the water from the second tank thereby creating a mixture having the spark-ignition fuel and the water, an injection valve which is allocated to the combustion chamber and by which the mixture can be injected directly into the combustion chamber, and a second injection valve which is allocated to the combustion chamber and provided in addition to the injection valve and by which in relation to the water and the spark-injection fuel, only the spark-injection fuel from the first tank can be injected at a location upstream of the combustion chamber into the intake tract and thus into the air flowing through the intake tract.

A direct injection assembly includes a follower mechanism having an input piston operably engaged with a camshaft and moving between first and second input positions along a first follower axis, in response to the camshaft rotating about a camshaft axis. The follower mechanism further includes an output piston movable between first and second output positions along a second follower axis. The follower mechanism further includes a coupler mechanism movable between a deactivated state and an activated state where the coupler mechanism holds the input piston and the output piston in fixed positions relative to one another, such that the coupler mechanism transmits a force from the input piston to the output piston. A pump includes a plunger movable from a first plunger position to a second plunger position where the plunger pressurizes the volume of fuel, in response to the plunger receiving the force from the output piston.

Methods and systems are provided for controlling fuel injection to cylinders of an engine in a vehicle. In one example, a method comprises monitoring an electrical energy profile associated with a fuel injector that has been commanded to inject a predetermined amount of a fuel into an engine cylinder, inferring a fuel injection pressure based on the electrical energy profile, and controlling a subsequent fuel injection based on the inferred fuel injection pressure. In this way, fuel injection may be controlled without relying on a pressure sensor in a fuel rail that supplies fuel to the fuel injector, under conditions where the fuel rail does not include the pressure sensor or where the pressure sensor is degraded.