Method for controlling heat exchanger fluid flow
First Claim
1. In a hybrid vehicle coolant circuit having a bypass flow pathway bypassing a heat exchanger, and a coolant pump providing an adjustable coolant flow divided between the bypass flow pathway and the heat exchanger, a method to control temperature changes in the coolant circuit comprising the steps of:
- providing an adjustable coolant split flow through said bypass flow pathway and said heat exchanger, said adjustable split flow adjusted to a predetermined coolant flow of said coolant divided between said bypass flow pathway and said radiator heat exchanger;
calculating a predicted temperature change in the coolant circuit immediately downstream of said heat exchanger in response to initiating a coolant flow from the heat exchanger into the coolant circuit; and
in response to the temperature change, adjusting at least one or more of a speed and a flow of the coolant pump to maintain the coolant circuit within a predetermined temperature range.
1 Assignment
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Accused Products
Abstract
In an exemplary embodiment, a method to control excessive temperature changes in a coolant circuit includes providing a coolant circuit including a bypass flow pathway bypassing a heat exchanger, said coolant circuit at an elevated operating temperature; providing an adjustable coolant flow through said bypass flow pathway and said heat exchanger; providing a coolant pump in said coolant circuit; determining a temperature change in said coolant circuit in response to initiating a coolant flow from said heat exchanger into said coolant circuit, said temperature change greater than a predetermined limit; and in response to said determined temperature change, adjusting at least one or more of said coolant pump speed and said coolant flow to maintain said coolant circuit within a predetermined temperature range.
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Citations
19 Claims
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1. In a hybrid vehicle coolant circuit having a bypass flow pathway bypassing a heat exchanger, and a coolant pump providing an adjustable coolant flow divided between the bypass flow pathway and the heat exchanger, a method to control temperature changes in the coolant circuit comprising the steps of:
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providing an adjustable coolant split flow through said bypass flow pathway and said heat exchanger, said adjustable split flow adjusted to a predetermined coolant flow of said coolant divided between said bypass flow pathway and said radiator heat exchanger; calculating a predicted temperature change in the coolant circuit immediately downstream of said heat exchanger in response to initiating a coolant flow from the heat exchanger into the coolant circuit; and in response to the temperature change, adjusting at least one or more of a speed and a flow of the coolant pump to maintain the coolant circuit within a predetermined temperature range.
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2. A method to control temperature changes in a vehicle coolant circuit having coolant, a heat exchanger bypass and a coolant pump with an adjustable speed and flow rate, and a heat exchanger, the method comprising the steps of:
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calculating a predicted coolant temperature change in the coolant circuit immediately downstream of said heat exchanger in response to initiating coolant flow from the heat exchanger into the coolant circuit; and adjusting at least one of the coolant pump speed and the coolant flow rate to maintain the coolant temperature within a predetermined temperature range if the coolant temperature change is greater than a predetermined temperature change limit; wherein said coolant flow is provided by a split flow valve, said split flow valve actively controlled by a preprogrammed controller in response to said temperature change, said split flow valve adjusted to a selected position to provide a predetermined coolant flow divided between said heat exchanger and said bypass. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method to control excessive temperature changes in a vehicle coolant circuit comprising:
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providing a coolant circuit comprising a bypass flow pathway bypassing a heat exchanger, said coolant circuit at an elevated operating temperature; providing an adjustable coolant split flow through said bypass flow pathway and said heat exchanger, said adjustable split flow adjusted to a predetermined coolant flow of said coolant divided between said bypass flow pathway and said heat exchanger; providing a coolant pump in said coolant circuit; calculating a predicted temperature change in said coolant circuit immediately downstream of said heat exchanger in response to initiating a coolant flow from said heat exchanger into said coolant circuit, said temperature change greater than predetermined limit; and in response to said determined temperature change, adjusting at least one or more of said coolant pump speed and said split flow to maintain said coolant circuit within a predetermined temperature range. - View Dependent Claims (16, 17, 18, 19)
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Specification