Method and device for interior heating in a motor vehicle

A method, comprising:

• initiating a first phase of filter regeneration for a diesel particulate filter in an engine;
• supplying waste engine heat to a heater core during the first phase;
• and
• extending a duration of the first phase responsive to cabin heating being requested.

A system, comprising:

• an internal combustion engine;
• an exhaust passage fluidically coupled to the engine and having a diesel particulate filter;
• a heater core fluidically coupled to the engine and configured to receive a coolant;
• and
• a controlling comprising:
• a logic subsystem;
• and
• a storage subsystem holding instructions executable by the logic subsystem to:
• initiate a first phase of a filter regeneration event based on one or more parameters for the filter;
• supply heat produced by the engine to the heater core during the first phase;
• extend the first phase if cabin heating is requested;
• and
• inject an additional amount of fuel during a second phase of the filter regeneration event after the first phase ends to cause soot combustion in the filter.