An engine control system for a vehicle, includes a model predictive control (MPC) module that identifies sets of possible target values based on an engine torque request, determines predicted operating parameters for the sets of possible target values, determines cost values for the sets of possible target values, selects one of the sets of possible target values based on the cost values; and sets target values based on the possible target values of the selected one of the sets; and a first actuator module that controls a first engine actuator based on a first one of the target values. The MPC module determines at least one of the predicted operating parameters at a future point in time based on a predicted value of engine rpm, which is determined based on a plurality of recent engine rpm measurements.

A method and system for controlling an EGR valve for a vehicle may include an adjusting step of reducing the amount of air flowing into an engine at operation points of the engine lower than a predetermined value at each of the operation points by a controller; a learning step of maintaining, as a reduction-learning amount, a reduction amount of the amount of air from the predetermined value before a malfunction occurs, by the controller, when a malfunction occurs in the engine due to the reduction in the amount of air; a compensating step of determining a compensating air amount at each of the operation points by applying the reduction amount to the predetermined value by the controller; and an EGR controlling step of controlling an EGR-opening amount to satisfy the compensating air amount for a current operation time after the compensating step.

A method and system for controlling an EGR valve for a vehicle may include an adjusting step of reducing the amount of air flowing into an engine at operation points of the engine lower than a predetermined value at each of the operation points by a controller; a learning step of maintaining, as a reduction-learning amount, a reduction amount of the amount of air from the predetermined value before a malfunction occurs, by the controller, when a malfunction occurs in the engine due to the reduction in the amount of air; a compensating step of determining a compensating air amount at each of the operation points by applying the reduction amount to the predetermined value by the controller; and an EGR controlling step of controlling an EGR-opening amount to satisfy the compensating air amount for a current operation time after the compensating step.

Methods and systems are provided for reducing pumping losses during a partial deactivation. In one example, a method may include applying negative pressure to a deactivated cylinder group to remove gases trapped therein while an activated cylinder group continues to combust.

A turbocharger system includes a valve assembly with an inlet, a first outlet, and a second outlet. The inlet is configured for receiving flow of an exhaust gas from an engine. The valve assembly includes a valve structure disposed within a housing. The valve structure is configured to rotate about an axis of rotation between a first position and a second position. The valve structure defines a nonlinear flow passage with an axial upstream end and radial downstream end. The valve structure, in a first position, directs exhaust gas from the inlet to the first outlet and closes off the second outlet. The valve structure, in the second position, directs exhaust gas from the inlet to the second outlet and closes off the first outlet.

A turbocharger system includes a valve assembly with an inlet, a first outlet, and a second outlet. The inlet is configured for receiving flow of an exhaust gas from an engine. The valve assembly includes a valve structure disposed within a housing. The valve structure is configured to rotate about an axis of rotation between a first position and a second position. The valve structure defines a nonlinear flow passage with an axial upstream end and radial downstream end. The valve structure, in a first position, directs exhaust gas from the inlet to the first outlet and closes off the second outlet. The valve structure, in the second position, directs exhaust gas from the inlet to the second outlet and closes off the first outlet.

Various systems and methods are provided for exhaust gas recirculation. In one example, an exhaust gas recirculation (EGR) system includes an EGR passage coupling an engine exhaust system to an engine intake system, an EGR cooler positioned in the EGR passage, a recirculation passage coupling an outlet of the EGR cooler to an inlet of the EGR cooler, an EGR cooler recirculation valve positioned in the recirculation passage and controllable to change a flow of exhaust gas though the recirculation passage, and a controller configured to adjust a position of the EGR cooler recirculation valve based on a temperature at the inlet of the EGR cooler.

Various systems and methods are provided for exhaust gas recirculation. In one example, an exhaust gas recirculation (EGR) system includes an EGR passage coupling an engine exhaust system to an engine intake system, an EGR cooler positioned in the EGR passage, a recirculation passage coupling an outlet of the EGR cooler to an inlet of the EGR cooler, an EGR cooler recirculation valve positioned in the recirculation passage and controllable to change a flow of exhaust gas though the recirculation passage, and a controller configured to adjust a position of the EGR cooler recirculation valve based on a temperature at the inlet of the EGR cooler.

An apparatus for controlling an EGR valve, includes: a measurement unit to measure at least one operation condition of an engine system; a fresh air amount setting unit to set a target amount of fresh air based on the operation condition; a fresh air amount sensor to measure a current amount of fresh air introduced through an intake line; a control calculation unit to set a signal for controlling an opening degree of the EGR valve so that the current amount of fresh air follows the target amount of fresh air; and an identifier to simulate an input and an output of the engine system, and output engine system input-output sensitivity which is a ratio of a change rate of the current amount of fresh air to a change rate of the opening degree of the EGR valve.

An apparatus for controlling an EGR valve, includes: a measurement unit to measure at least one operation condition of an engine system; a fresh air amount setting unit to set a target amount of fresh air based on the operation condition; a fresh air amount sensor to measure a current amount of fresh air introduced through an intake line; a control calculation unit to set a signal for controlling an opening degree of the EGR valve so that the current amount of fresh air follows the target amount of fresh air; and an identifier to simulate an input and an output of the engine system, and output engine system input-output sensitivity which is a ratio of a change rate of the current amount of fresh air to a change rate of the opening degree of the EGR valve.