Reducing heating of a particulate filter during a regeneration event

A vehicle having an engine coupled to an electric machine connected to a traction battery and including a particulate filter configured to receive engine exhaust, comprising:

• a controller configured to:
• operate the electric machine to reduce a state of charge of the traction battery prior to a subsequent filter regeneration event responsive to the state of charge of the battery being above a predefined level and a predicted temperature of the particulate filter during the subsequent regeneration event exceeding a threshold;
• and
• in response to an accelerator pedal tip-out during the subsequent filter regeneration event and filter temperature exceeding a threshold:
• increase fuel to the engine to reduce oxygen in the engine exhaust;
• and
• operate the electric machine to charge the battery and offset torque produced by increasing the fuel.

A vehicle comprising:

• an engine;
• a battery;
• an electric machine coupled to the engine and connected to the battery;
• a particulate filter receiving engine exhaust gas;
• and
• a controller configured to reduce a state of charge of the battery prior to a regeneration event responsive to the state of charge of the battery being above a predefined level and an estimate of current soot loading of the particulate filter exceeding a regeneration threshold, the regeneration threshold being lower than a threshold that triggers activation of a regeneration event.