EXHAUST THROTTLING FOR CABIN HEATING
First Claim
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1. A method for heating a vehicle cabin comprising:
- closing an exhaust throttle while diverting at least a portion of throttled exhaust gas through an exhaust gas recirculation (EGR) cooler coupled upstream of the throttle; and
transferring heat from the EGR cooler to a heater core to provide heat to the vehicle cabin.
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Abstract
Embodiments for heating a vehicle cabin are disclosed. In one example, a method for heating a vehicle cabin comprises closing an exhaust throttle while diverting at least a portion of throttled exhaust gas through an exhaust gas recirculation (EGR) cooler coupled upstream of the throttle, and transferring heat from the EGR cooler to a heater core configured to provide heat to the vehicle cabin. In this way, exhaust heat may be directly routed to the cabin heating system.
34 Citations
20 Claims
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1. A method for heating a vehicle cabin comprising:
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closing an exhaust throttle while diverting at least a portion of throttled exhaust gas through an exhaust gas recirculation (EGR) cooler coupled upstream of the throttle; and transferring heat from the EGR cooler to a heater core to provide heat to the vehicle cabin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A vehicle system, comprising:
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an engine including an intake and an exhaust; an exhaust gas recirculation (EGR) passage coupling the exhaust to the intake, the EGR passage including an EGR cooler and an EGR valve; an EGR bypass coupled across the EGR cooler; a cabin heating system including a heater core and a circulation pump configured to pump coolant from the EGR cooler to the heater core; and an exhaust throttle positioned in the exhaust downstream of an inlet of the EGR passage and upstream of an outlet of the EGR bypass. - View Dependent Claims (13, 14, 15)
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16. A method, comprising:
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adjusting a flow rate of coolant pumped from an exhaust gas recirculation (EGR) cooler to a cabin heating system heater core based on an inlet temperature of the heater core; and during select conditions, throttling exhaust gas to increase exhaust pressure and to route the exhaust gas through the EGR cooler, heat from the exhaust gas transferred to the heater core via the EGR cooler. - View Dependent Claims (17, 18, 19, 20)
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Specification