Brake-by-wire system with switched reluctance motor controller
AssigneeITT Manufacturing Enterprises, Inc.
InventorRoy A. McCann
Life of this patent
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Abstract
A motor control system selectively energizes a motor winding to maximize the motors efficiency and output torque under conditions of varying rotor speed, winding temperature, and supply voltage. Motor output requirement values and sensor output is used to develop independent parameters in the translation and dilation domain from which optimal turn-on and turn-off or "conduction angles" are developed. The optimal conduction angles are processed by circuitry to generate actuation signals that selectively control the delivery of energy to the motor winding.
Claims14
A method for selectively energizing a motor winding, comprising the steps of:
- accepting a first input value related to a requirement for motor output;
- developing translation and dilation parameters based upon said first input value;
- developing a conduction angle value based upon said translation and dilation parameters, said conduction angle value representing the substantially optimal angular position of the rotor of said motor at which to selectively control the delivery of energy to said winding;
- controlling selectively the delivery of energy to said winding based upon said conduction angle value;
- accepting a second input value as a temperature value related to the temperature of said winding;
- and
- developing said translation parameter based upon said first input value and said second input value.
A method for selectively energizing a motor winding, comprising the steps of:
- accepting a first input value related to a requirement for motor output;
- accepting a second input value related to the temperature of said motor winding;
- developing translation and dilation parameters based upon said first and second input values;
- developing a pair of conduction angle values based upon said translation and dilation parameters, each of said conduction angle values representing a substantially optimal angular position of the rotor of said motor at which to selectively control the delivery of energy to said winding
- selectively energizing said winding at a first one of said conduction angle values, and
- selectively de-energizing said winding at a second one of said conduction angle values.
A method for selectively energizing multiple stator pole windings for the rotation of a switched reluctance motor, comprising the steps of:
- inputting an output requirement from a system controller representing required motor output;
- inputting a temperature value from a winding temperature sensor representing winding temperature;
- inputting a voltage value based upon a measured supply voltage;
- deriving temperature and voltage error values from said temperature and voltage values;
- determining a translation parameter based upon said temperature and voltage values and said output requirement;
- determining a dilation parameter based upon said output requirement;
- providing circuitry to output a signal representative of the substantially optimal angular position of the rotor of said motor at which to selectively control the delivery of energy to said stator pole windings based upon said translation and dilation parameters;
- and
- controlling selectively the delivery of energy to at least one of said stator pole windings at said substantially optimal angular position of said rotor.
An apparatus for selectively energizing a motor winding to spin a rotating member, comprising:
- an output error value generator for generating an output error value representing the deviation of an operating value from a reference value;
- processing circuitry with software control, in communication with said output error value generator, for developing a dilation parameter and a translation parameter based upon said output error value and outputting a conduction angle value representing the substantially optimal angular position of said rotating member at which to selectively control the delivery of energy to said winding;
- and
- a temperature sensor, in the vicinity of said winding and in communication with said processing circuitry, that outputs a temperature value representing the temperature of said winding.
Dependencies are inferred from the claim text.