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US 11,307,225 B2Granted
Temperature based control of variable voltage converter
AssigneeFord Global Technologies, LLC
InventorsLihua Chen, Boris Curuvija, Baoming Ge
Life of this patent
Estimating the term…
Abstract
A vehicle electric drive includes a controller programmed to operate a power converter to boost voltage from a battery for a DC bus and to limit voltage output from the power converter to a predefined maximum voltage value that varies with temperature of coolant used to cool the power converter.
Claims13
A vehicle electric drive comprising:
- a battery;
- a DC bus;
- a power converter electrically between the battery and DC bus;
- and a controller programmed to, responsive to a requested voltage value for the DC bus, operate the power converter (i) to boost voltage from the battery toward a target value defined as a lesser of the requested voltage value and a predefined maximum limit value that varies with temperature of coolant used to cool the power converter and (ii) at a duty cycle defined as a lesser of a non-zero limit duty cycle and a non-zero requested duty cycle that is based on the target value and a voltage of the battery, wherein the limit value decreases as the temperature decreases and wherein the controller is further configured to limit the duty cycle to a maximum duty cycle value.
1 more element
A method comprising:
- responsive to a requested voltage value for a DC bus, operating a power converter electrically between a battery and the DC bus at a duty cycle defined as a lesser of a non-zero limit duty cycle and a non-zero requested duty cycle, that is based on a target voltage value and a voltage of the battery, to boost voltage from the battery toward the target voltage value, wherein the target voltage value is defined as a lesser of the requested voltage value and a predefined limit voltage value that varies with temperature of coolant used to cool the power converter and wherein the limit voltage value decreases as the temperature decreases;
- and limiting the duty cycle to a maximum duty cycle value.
A vehicle electric drive comprising:
- a battery;
- DC bus;
- a power converter electrically between the battery and DC bus;
- and a controller programmed to operate the power converter to boost voltage from the battery for the DC bus and to limit voltage output from the power converter to a predefined maximum voltage value that varies with temperature of coolant used to cool the power converter, wherein the maximum voltage value decreases as the temperature decreases, and at a duty cycle defined as a lesser of a limit duty cycle and a requested duty cycle that is based on a target value and a voltage of the battery, and limit the duty cycle to a maximum duty cycle value.
1 more element
Dependencies are inferred from the claim text.