Heat generation for the purpose of warming up an EV battery in cold weather
AssigneeWhs Energy Solutions, LLC
InventorsStefan Grubic, Ernesto Inoa, Majd Abdelqader
Life of this patent
Estimating the term…
Abstract
An operating point for a vehicle electric motor is selected to produce requested torque inefficiently, to generate additional heat to warm the battery. A torque command for operation of the vehicle at a desired speed and a heat power command for an amount of heat needed to warm a battery powering the vehicle electric motor are received by a motor controller. The motor controller determines an operating point of the vehicle electric motor that corresponds to both the requested torque and the amount of heat, and the vehicle electric motor is controlled based on the determined operating point.
Claims18
A method, comprising:
- receiving a torque command for a motor torque causing operation of a vehicle electric motor at a desired speed;
- receiving a heat power command for an amount of heat for warming a battery powering the vehicle electric motor;
- determining an operating point of the vehicle electric motor corresponding to both the motor torque and the amount of heat by at least
- measuring a speed of the vehicle electric motor,
- determining a traction output power as a product of the motor torque and the measured speed of the vehicle electric motor,
- determining a required total motor power equal to the traction output power plus the heat power command, and
- determining direct-axis (d-axis) and quadrature axis (q-axis) current commands for controlling the electric motor to operate at the determined operating point based upon the required total motor power such that the operating point is selected away from a maximum torque per amp (MTPA) operating point to increase motor losses while maintaining the motor torque;
- and
- controlling the vehicle electric motor based on the determined operating point.
A system, comprising:
- a vehicle electric motor;
- and
- a motor controller configured to
- receive a torque command for a motor torque causing operation of the vehicle electric motor at a desired speed,
- receive a heat power command for an amount of heat for warming a battery powering the vehicle electric motor,
- determine an operating point of the vehicle electric motor corresponding to both the motor torque and the amount of heat by at least
- measuring a speed of the vehicle electric motor,
- determining a traction output power as a product of the motor torque and the measured speed of the vehicle electric motor,
- determining a required total motor power equal to the traction output power plus the heat power command, and
- determining direct-axis (d-axis) and quadrature axis (q-axis) current commands for controlling the electric motor to operate at the determined operating point based upon the required total motor power such that the operating point is selected away from a maximum torque per amp (MTPA) operating point to increase motor losses while maintaining the motor torque, and
- control the vehicle electric motor based on the determined operating point.
Dependencies are inferred from the claim text.