Abstract: A hybrid electric vehicle (HEV) includes an internal combustion engine, an electric traction motor, and a motor/generator configured to drive the internal combustion engine or be driven by the internal combustion engine to generate electricity to charge a high voltage battery and/or drive the electric traction motor. An exhaust aftertreatment system includes a gasoline particulate filter (GPF), and a control system includes a controller for monitoring and performing a regeneration operation of the GPF. The controller is programmed to determine the GPF needs to be regenerated, and determine if a temperature of the GPF meets or exceeds a predetermined threshold indicating a GPF regeneration can occur. Upon an engine shutdown event, if the temperature meets or exceeds the predetermined threshold, the controller gradually spins down a speed of the internal combustion engine in fuel shut-off to generate a flow of air to the GPF to initiate a GPF regeneration.

Abstract: Techniques for a mild hybrid vehicle utilize a control system for detecting a deceleration fuel shutoff (DFSO) event where fueling to an engine is disabled and in response to detecting the DFSO event: determining a desired pumping loss for the engine based on a parameter of a battery system, the desired pumping loss corresponding to a desired amount of electrical energy that a motor generator unit (MGU) of a belt-driven starter generator (BSG) system will generate to charge the battery system; commanding a throttle valve of the engine to an initial position determined based on the desired engine pumping loss and a speed of the engine; estimating an actual pumping loss of the engine based on an estimated airflow into the engine; and adjusting the position of the throttle valve based on a difference between the desired and actual engine pumping losses.