Motor control system
AssigneeFord Global Technologies, LLC
InventorsLi Chen, Xingyi Xu, Richard Joseph Hampo, Kerry Eden Grand
Life of this patent
Estimating the term…
Abstract
A motor control system 16 for use within an electric vehicle 10 having an induction motor 12. Control system 16 utilizes a torque control module 18, a vector control module 20 and a space vector PWM module 22 to efficiently and accurately control the torque provided by motor 12.
Claims18
A motor control system for use within a vehicle including an alternating current type electric motor, a direct current type electrical power supply, and at least one driver-operated control, said control system comprising:
- a first portion which is communicatively coupled to and receives torque commands from said at least one driver-operated control;
- a second portion which receives generated flux current and torque current, and which includes a flux observer having a current model which is applied when said motor is operating at a low speed, and a voltage model which is applied when said motor is operating at a high speed;
- a torque control portion which receives torque commands from said at least one driver-operated control and which is effective to provide said torque current and said flux current based upon said received torque commands;
- a vector control portion which receives said torque current and said flux current and which is effective to provide a first voltage value and a second voltage value based upon said torque current and said flux current;
- and
- a space vector pulse-width modulating portion, which is coupled to said power supply and to said motor, which receives said first voltage value and said second voltage value and which uses said first and second voltage values to deliver a multi-phase voltage signal to said motor, effective to cause said motor to accurately deliver said torque commands.
A motor control system for use in combination with a vehicle of the type having an alternating current induction motor which selectively delivers torque to said vehicle, a power supply, and at least one driver-operated control, said motor control system comprising:
- a first portion which is communicatively coupled to and receives torque commands from said at least one driver operated control, said first portion being effective to generate a flux current and a torque commands and a synchronous speed value of said motor;
- a second portion which receives said generated flux current, and which includes a flux observer having a current model which is applied when said motor is operating at a low speed, and a voltage model which is applied when said motor is operating at a high speed, said second portion being effective to generate a direct axis voltage and a quadrature axis voltage based upon said generated flux and torque currents and at least one motor specific parameter;
- and
- a third portion which receives said direct and quadrature axis voltages and which converts said direct and quadrature axis voltages into a three phase voltage signal which is communicated to said induction motor, effective to cause said motor to accurately deliver said torque commands.
A method for controlling an alternating current induction motor within a vehicle including direct current power supply;
- at least one driver-operated control;
- a first portion which is communicatively coupled to and receives torque commands from said at least one driver operated control;
- and a second portion which receives said generated flux current and torque current, said method comprising the steps of:
- receiving torque commands from said at least one driver-operated control;
- generating a torque current and a flux current based upon said received torque commands;
- generating a direct axis voltage and a quadrature axis voltage based upon said generated torque current and flux current;
- converting said direct axis voltage and said quadrature axis voltage into a pulse-width modulated signal;
- providing a flux observer having a current model which is applied when said motor is operating at a low speed;
- providing a voltage model which is applied when said motor is operating at a high speed;
- and
- using said pulse width modulated signal and said direct current power supply to provide a three-phase voltage signal to said induction motor, effective to cause said induction motor to accurately deliver said torque commands.
Dependencies are inferred from the claim text.