METHOD OF FLOWING COOLANT THROUGH EXHAUST HEAT RECOVERY SYSTEM AFTER ENGINE SHUTOFF
First Claim
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1. A method, comprising:
- flowing coolant through a coolant system while an engine is not operating, while adjusting a flow rate of the coolant through a rear axle heat exchanger (RAHX) in response to a rear axle oil temperature.
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Abstract
Methods and systems are provided for adjusting a flow of coolant through a coolant system including a rear axle heat exchanger. In one example, a method may include flowing coolant through the coolant system while an engine is not operating. In another example, a method may include increasing a flow of coolant to the rear axle heat exchanger while the engine is not operating when a rear axle oil temperature exceeds a threshold temperature.
19 Citations
20 Claims
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1. A method, comprising:
flowing coolant through a coolant system while an engine is not operating, while adjusting a flow rate of the coolant through a rear axle heat exchanger (RAHX) in response to a rear axle oil temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a coolant system of an engine, comprising:
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in response to engine shutoff, flowing coolant through coolant lines fluidly coupled to an exhaust gas heat exchanger (EGHX), a rear axle heat exchanger (RAHX), and a thermal storage vessel (TSV); adjusting a flow rate of the coolant through the RAHX in response to a rear axle oil temperature; and adjusting a flow rate of the coolant through the TSV in response to a temperature of the TSV. - View Dependent Claims (11, 12, 13, 14)
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15. A method for a rear axle coolant system of an engine, comprising:
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during engine operation; responsive to a first condition, recovering exhaust gas heat at an exhaust gas heat exchanger (EGHX) via coolant in a coolant loop and storing the recovered exhaust gas heat in a thermal storage vessel (TSV); responsive to a second condition, transferring heat from the TSV to rear axle lubrication oil via a rear axle heat exchanger (RAHX); and during engine non-operation; responsive to a temperature of the rear axle lubrication oil, adjusting a flow of the coolant to the RAHX; responsive to a temperature of the TSV, adjusting a flow of the coolant to the TSV; and responsive to a temperature of the EGHX, adjusting a flow rate of the coolant through the coolant loop. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification