Motor regenerative control method, motor control circuit, and motor regenerative control program

A motor control circuit that, after allowing a positive current to flow from a battery to a motor through an inverter circuit such that the motor generates a positive torque, allows a negative current to flow from the battery to the motor through the inverter circuit such that a regenerative current flows from the motor to the battery to charge the battery, the motor control circuit comprising:

• an inverter drive control unit controlling drive of the inverter circuit;
• a power supply current measurement unit that sets a target regenerative current value based on a state of the battery, allows the negative current to flow to the motor in order to make the regenerative current close to the target regenerative current value, and measures the regenerative current while allowing the regenerative current to flow to the battery;
• a motor current command unit that determines a current command value for allowing the negative current to flow to the motor so as to eliminate a difference between a regenerative current value measured by the power supply current measurement unit and the target regenerative current value and inputs the current command value to the inverter drive control unit;
• and
• a determination unit determining whether the regenerative current value measured by the power supply current measurement unit is increasing or decreasing,
• wherein, when the determination unit determines that the regenerative current value measured by the power supply current measurement unit is increasing, the motor current command unit continues control to allow the negative current to flow to the motor so as to eliminate the difference between the regenerative current value measured by the power supply current measurement unit and the target regenerative current value, and
• when the determination unit determines that the regenerative current value measured by the power supply current measurement unit is not capable of reaching the target regenerative current value and is decreasing, the power supply current measurement unit detects a maximum regenerative current value based on a history of the measured regenerative current value, and the motor current command unit determines a current command value for adjusting the current flowing to the motor such that the regenerative current value reaches the maximum regenerative current value and inputs the current command value to the inverter drive control unit.

A non-transitory computer-readable storage medium storing motor regenerative control program implementing regenerative control that, after allowing a positive current to flow from a battery to a motor such that the motor generates a positive torque, allows a negative current to flow to the motor such that a regenerative current flows from the motor to the battery to charge the battery, wherein the motor regenerative control program are executable by a processor for implementing:

• a function (a) of setting a target regenerative current value based on a state of the battery;
• a function (b) of allowing the negative current to flow to the motor such that the regenerative current is close to the target regenerative current value and measuring the regenerative current while allowing the regenerative current to flow to the battery;
• a function (c) of performing feedback control to allow the negative current to flow to the motor so as to eliminate a difference between measured regenerative current value and the target regenerative current value;
• a function (d) of determining whether the measured regenerative current value is increasing or decreasing;
• a function (e) of maintaining the feedback control when it is determined that the measured regenerative current value is increasing;
• and
• a function (f) of, when it is determined that the measured regenerative current value is not capable of reaching the target regenerative current value and is decreasing, detecting a maximum regenerative current value based on a history of the measured regenerative current value and adjusting and controlling the current flowing to the motor such that the regenerative current value reaches the maximum regenerative current value.