Vehicle control device, vehicle control method, and non-transitory computer readable storage medium

A vehicle control device comprising:

• at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to cause the vehicle control device to:
• determine, when a vehicle rides over a level difference or travels on an uphill road, whether the vehicle is in a stopped state due to load torque, which acts on a rotary electrical machine driving the vehicle and balances with torque of the rotary electrical machine;
• set, when determining that the vehicle is in the stopped state, a target speed of the vehicle in accordance with an operation amount of an accelerator pedal provided to the vehicle;
• and
• calculate target torque of the rotary electrical machine when executing feedback control to cause an actual vehicle speed of the vehicle to become the target speed.

A vehicle control method comprising:

• estimating, by at least one processor, temperature of a drive device, which includes a rotary electrical machine configured to drive a vehicle and an inverter connected to the rotary electrical machine, based on a temperature detection value of at least one of a plurality of power elements of the inverter and a current value of each of the power elements;
• in a state in which the drive device is overloaded, controlling, by the at least one processor, torque of the rotary electrical machine based on the temperature as estimated to decrease temperature of the drive device;
• estimating temperature of the drive device based on the temperature detection value, when rotation speed of the rotary electrical machine is higher than predetermined rotation speed in a vicinity of a rotational stop;
• and
• estimating temperature of the drive device based on the temperature detection value and a current value for each of the power elements, when the rotation speed of the rotary electrical machine is equal to or less than the predetermined rotation speed in the vicinity of the rotational stop.

A vehicle control method comprising:

• determining, by at least one processor, when a vehicle rides over a level difference or travels on an uphill road, whether the vehicle is in a stopped state due to load torque, which acts on a rotary electrical machine driving the vehicle and balances with torque of the rotary electrical machine;
• setting, by the at least one processor, when determining that the vehicle is in the stopped state, a target speed of the vehicle in accordance with an operation amount of an accelerator pedal provided to the vehicle;
• and
• calculating, by the at least one processor, target torque of the rotary electrical machine when executing feedback control to cause an actual vehicle speed of the vehicle to become the target speed.

A non-transitory computer readable storage medium storing a program comprising instructions configured to, when executed by at least one processor, cause the at least one processor to:

• estimate temperature of a drive device, which includes a rotary electrical machine configured to drive a vehicle and an inverter connected to the rotary electrical machine, based on a temperature detection value of at least one of a plurality of power elements of the inverter and a current value of each of the power elements;
• in a state in which the drive device is overloaded, control torque of the rotary electrical machine based on the temperature as estimated to decrease temperature of the drive device;
• estimate temperature of the drive device based on the temperature detection value, when rotation speed of the rotary electrical machine is higher than predetermined rotation speed in a vicinity of a rotational stop;
• and
• estimate temperature of the drive device based on the temperature detection value and a current value for each of the power elements, when the rotation speed of the rotary electrical machine is equal to or less than the predetermined rotation speed in the vicinity of the rotational stop.

A non-transitory computer readable storage medium storing a program comprising instructions configured to, when executed by at least one processor, cause the at least one processor to:

• determine, when a vehicle rides over a level difference or travels on an uphill road, whether the vehicle is in a stopped state due to load torque, which acts on a rotary electrical machine driving the vehicle and balances with torque of the rotary electrical machine;
• set, when determining that the vehicle is in the stopped state, a target speed of the vehicle in accordance with an operation amount of an accelerator pedal provided to the vehicle;
• and
• calculate target torque of the rotary electrical machine when executing feedback control to cause an actual vehicle speed of the vehicle to become the target speed.