High speed operation of an electric machine
AssigneeBAE Systems Controls Inc.
InventorsMatthew Boecke, Arthur Lyons, Brian Sehn
Life of this patent
Estimating the term…
Abstract
A hybrid electric vehicle having a controllable switch that enables a DC link to be operated independent from an energy storage system (ESS) is provided. The ESS is selectively couplable to the DC link via the controllable switch. A processor is configured to control the switch to open and close under certain conditions. When the switch is opened, the processor is configured to instruct an engine controller to cause an engine which is coupled to a generator to boost engine output. The generator is coupled to a generator inverter which is also coupled to the DC link. A motor inverter is also coupled to the DC link and is configured to provide AC power to the motor.
Claims14
A system for a hybrid electric vehicle comprising:
- a first inverter coupled to a generator, where the generator is mechanically couplable to an engine, the first inverter, when the generator is coupled to the engine, is configured to receive AC power from the generator and provide DC power for a DC link;
- an energy storage system selectively couplable to the DC link;
- a motor;
- a second inverter coupled to the DC link and configured to receive the DC power from the first inverter and the energy storage system when coupled and provide AC power to the motor;
- a propulsion shaft coupled to the motor;
- a switch configured to close to electrically couple the energy storage system to the DC link and open to electrically isolate the energy storage system from the DC link;
- a processor configured to control the switch to open when a required propulsion output from the motor corresponding to a requested propulsion exceeds a power available to the motor or when an output from the motor which is producible from the power available to the motor is less than the required propulsion output from the motor corresponding to the requested propulsion,
- wherein when the switch is opened, the processor is configured to instruct an engine controller to cause the engine to boost engine output.
A non-transitory computer readable storage device having instructions, which when executed by a processor, cause the processor to execute:
- determining an output power required from a motor corresponding to a requested propulsion for a vehicle, the motor being coupled to a motor inverter configured to supply the motor with AC power, where the motor inverter is coupled to a DC link;
- determining input power available to the motor, the input power available being based at least one on a state of charge of an energy storage system, the energy storage system being selectively couplable to the DC link;
- comparing the determine input power with the determined output power required;
- when the determined input power is less than the determined output power required,
- controlling a switch connected between the energy storage system and the DC link to open to electrically isolate the energy storage system from the DC link;
- and
- issuing a command to an engine controller to cause an engine, couplable to a generator, to boast engine output, where the generator is coupled to a generator inverter and the generator inverter is coupled to the DC link.
A non-transitory computer readable storage device having instructions, which when executed by a processor, cause the processor to execute:
- determining an output power required from a motor corresponding to a requested propulsion for a vehicle, the motor being coupled to a motor inverter configured to supply the motor with AC power, where the motor inverter is coupled to a DC link;
- determining an output power from the motor which is producible from a power available to the motor;
- comparing the determined output power required with the determined output power producible;
- when the determined output power producible is less than the output power required,
- controlling a switch connected between an energy storage system and the DC link to open to electrically isolate the energy storage system from the DC link;
- and
- issuing a command to an engine controller to cause an engine, couplable to a generator, to boast engine output, where the generator is coupled to a generator inverter and the generator inverter is coupled to the DC link.
Dependencies are inferred from the claim text.