Torque Command Generation Device

A torque command generation device that generates a motor-generated-torque command signal for driving a motor in a drivetrain test system for generating a torque imitating an engine of a vehicle with a motor connected to a shaft of a drivetrain of the vehicle, the device comprising:

• a limit value calculation unit for calculating a limit value for a value of the motor-generated-torque command signal according to a revolution speed of the motor;
• a DC signal generation unit for generating a DC signal;
• an AC signal generation unit for generating an AC signal;
• and
• a compositing unit for compositing the DC signal and the AC signal to generate the motor-generated-torque command signal,
• wherein the AC signal generation unit includes:
• a base signal generation unit for generating a base AC signal;
• a multiplying unit for generating the AC signal by multiplying a predetermined amplitude attenuation coefficient by a value of the base AC signal;
• and
• a surplus amplitude limiting unit for determining the amplitude attenuation coefficient so that there is no deviation between a maximum value of the motor-generated-torque command signal and the limit value,
• wherein the AC signal generation unit generates the AC signal of an amplitude such that the value of the motor-generated-torque command signal does not exceed the limit value, by using the base signal generation unit, the multiplying unit, and the surplus amplitude limiting unit.

A torque command generation device that generates a motor-generated-torque command signal for driving a motor in a drivetrain test system for generating a torque imitating an engine of a vehicle with a motor connected to a shaft of a drivetrain of the vehicle, the device comprising:

• a base value calculation unit for calculating positive and negative torque limit base values for the motor-generated-torque command signal according to a revolution speed of the motor;
• a correction unit for correcting the positive and negative torque limit base values and calculating positive and negative torque limit values;
• and
• a torque command generating unit for generating the motor generated torque command signal by discarding larger values than the positive torque limit value and smaller values than the negative torque limit value from a base signal including a DC component and AC component,
• wherein the correction unit, in a case of a surplus occurring in the base signal relative to either one sign of the positive and negative torque limit base values, corrects to the torque limit base value of the opposite sign to a smaller absolute value.