Battery health aware thermal management system
AssigneeGarrett Transportation I Inc.
InventorsSemaria Ruiz Alvarez, Tomas Poloni, Matej Pcolka
Life of this patent
Estimating the term…
Abstract
Control architectures and methods for use in a vehicle having a battery and a powertrain including an electric motor that receives power from the battery. A battery thermal management system is controlled to minimize economic costs that are summed from each of costs of battery deterioration and costs of maintaining the battery at given temperatures. The control architecture is for the thermal management system and treats battery current as a disturbance rather than as a controlled parameter.
Claims20
A vehicle comprising:
- a powertrain including an electric motor and a rechargeable battery coupled to the electric motor to provide drive power for the vehicle, the rechargeable battery including a first temperature sensor configured to sense a temperature of the rechargeable battery;
- a thermal management system for the rechargeable battery using a circulating fluid to control temperature of the rechargeable battery, the thermal management system including a chiller for cooling the circulating fluid;
- and
- a BTMS controller configured to control operation of the thermal management system by:
- obtaining a set of temperatures from the thermal management system, including at least one temperature of the circulating fluid, and a battery temperature;
- estimating a state of charge (SOC) of the battery;
- using a battery thermal model to estimate heat transfer between the circulating fluid and the battery, and a chiller model to estimate heat transfer in the chiller;
- predicting, in a time horizon, a battery current;
- applying a cost function minimization to determine control parameters to issue to the thermal management system by minimizing a sum of economic costs of battery health effects in the time horizon, the sum of economic costs varying with SOC of the battery, and economic costs of operation of the thermal management system in the time horizon;
- and
- issuing the control parameters to the thermal management system.
A vehicle comprising:
- a powertrain including an electric motor and a rechargeable battery coupled to the electric motor to provide drive power for the vehicle, the rechargeable battery including a first temperature sensor configured to sense a temperature of the rechargeable battery;
- a thermal management system for the rechargeable battery using a circulating fluid to control temperature of the rechargeable battery, the thermal management system including a chiller for cooling the circulating fluid;
- and
- a reference tracking controller coupled to the thermal management system and configured to use a set of references to control operation of the thermal management system;
- a non-linear optimizing controller configured to calculate and communicate the set of references to the reference tracking controller by:
- obtaining a set of temperatures from the thermal management system, including at least one temperature of the circulating fluid, and a battery temperature;
- estimating a state of charge (SOC) of the battery;
- using a battery thermal model to estimate heat transfer between the circulating fluid and the battery, and a chiller model to estimate heat transfer in the chiller;
- predicting, in a time horizon, a battery current;
- applying a cost function minimization to determine the set of references for controlling the thermal management system by minimizing a sum of economic costs of battery health effects in the time horizon, the sum of economic costs varying with SOC of the battery, and economic costs of operation of the thermal management system in the time horizon;
- and
- issuing the set of references to the reference tracking controller.
A method of controlling battery temperature in a vehicle, the vehicle including a powertrain including an electric motor and a battery coupled to the electric motor to provide drive power for the vehicle, the rechargeable battery including a first temperature sensor configured to sense a temperature of the battery, and a thermal management system for the battery using a circulating fluid to control temperature of the battery, the thermal management system including a chiller for cooling the circulating fluid;
- the method comprising:
- issuing control signals from a reference tracking controller to control operation of the thermal management system using a set of references;
- issuing the set of references to the reference tracking controller from a non-linear optimizing controller;
- calculating the set of references at the reference tracking controller by:
- obtaining a set of temperatures from the thermal management system, including at least one temperature of the circulating fluid, and a battery temperature;
- estimating a state of charge (SOC) of the battery;
- using a battery thermal model to estimate heat transfer between the circulating fluid and the battery, and a chiller model to estimate heat transfer in the chiller;
- predicting, in a time horizon, a battery current;
- and
- applying a cost function minimization to determine the set of references for controlling the thermal management system by minimizing a sum of economic costs of battery health effects in the time horizon, the sum of economic costs varying with SOC of the battery, and economic costs of operation of the thermal management system in the time horizon.
Dependencies are inferred from the claim text.