Exhaust throttling for cabin heating

摘要

Embodiments for heating a vehicle cabin are disclosed. In one example, a method for an engine comprises pumping coolant from a coolant reservoir to an exhaust component and then to a heater core, the coolant heated by the exhaust component, and during engine warm-up conditions, adjusting a flow rate of coolant into a heater core to maximize heat transfer to a vehicle cabin.

主权项

1. A method for an engine, comprising:
pumping coolant from a coolant reservoir to an exhaust component and then to a heater core, the coolant heated by the exhaust component; during engine warm-up conditions, adjusting a flow rate of coolant into the heater core in coordination with operating an exhaust throttle to increase exhaust backpressure and divert at least a portion of exhaust upstream of the throttle through the exhaust component based on a temperature drop across the heater core and a commanded flow rate of coolant into the heater core to maximize heat transfer to a vehicle cabin; and flowing the diverted portion of exhaust exiting from the exhaust component through an ejector to generate a vacuum.