Auxiliary pump scheme for a cooling system in a hybrid-electric vehicle
First Claim
Patent Images
1. A method for an engine cooling system with a radiator and a heater core, comprising:
- during engine off, operating an auxiliary pump to flow coolant through the heater core;
during engine running, operating an engine-driven pump to flow coolant through the heater core and the radiator, and selectively operating the auxiliary pump to assist the flow through the heater core and radiator based on operating conditions; and
during engine running, adjusting an auxiliary pump assist amount based on the operating conditions, wherein the operating conditions include engine speed, and in at least one condition the auxiliary pump assist amount increases when the engine speed decreases, and wherein the operating conditions include ambient temperature, and in at least one condition the auxiliary pump assist amount increases when the ambient temperature increases.
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Abstract
Various systems and methods are described for a cooling system coupled to an engine in a vehicle. One example method comprises, during engine off, operating an auxiliary pump to flow coolant through a heater core; and, during engine running, operating an engine pump to flow coolant through the heater core and radiator, and selectively operating the auxiliary pump to assist flow through the heater core based on operating conditions.
13 Citations
15 Claims
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1. A method for an engine cooling system with a radiator and a heater core, comprising:
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during engine off, operating an auxiliary pump to flow coolant through the heater core; during engine running, operating an engine-driven pump to flow coolant through the heater core and the radiator, and selectively operating the auxiliary pump to assist the flow through the heater core and radiator based on operating conditions; and during engine running, adjusting an auxiliary pump assist amount based on the operating conditions, wherein the operating conditions include engine speed, and in at least one condition the auxiliary pump assist amount increases when the engine speed decreases, and wherein the operating conditions include ambient temperature, and in at least one condition the auxiliary pump assist amount increases when the ambient temperature increases. - View Dependent Claims (2, 3, 4)
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5. A method for a cooling system coupled to a vehicle engine, comprising:
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during engine off, operating an auxiliary pump to flow coolant through a heater core; during engine running; operating an engine-driven pump to flow coolant through the heater core and a radiator, selectively operating the auxiliary pump to assist the flow through the heater core and radiator based on ambient temperature, and decreasing an auxiliary pump assist amount based on decreasing ambient temperature. - View Dependent Claims (6, 7, 8, 9)
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10. A cooling system for an engine in a motor vehicle, comprising:
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an engine-driven pump; an auxiliary pump in fluidic communication with the engine-driven pump; a first loop including a radiator, and where the engine-driven pump circulates coolant through the radiator in the first loop; a second loop parallel to the first loop including a heater core, and where the auxiliary pump circulates coolant through the heater core in the second loop; and a controller for operating the auxiliary pump and the engine-driven pump, the controller comprising a computer readable storage medium, the medium comprising instructions for; during engine off, operating the auxiliary pump to flow coolant through the heater core; during engine running, operating the engine-driven pump to flow coolant through the heater core and the radiator, and selectively operating the auxiliary pump to assist the flow through the heater core based on operating conditions; and during engine running, adjusting an auxiliary pump assist amount based on the operating conditions, wherein the operating conditions include engine speed and ambient temperature, and, wherein the auxiliary pump assist amount increases in response to an increase in ambient temperature. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification