Electronic control apparatus

1. An electronic control apparatus mountable on a vehicle, the vehicle including a motor generator connected to a drive wheel of the vehicle to drive the drive wheel and a battery configured to supply electric power to the motor generator, the battery capable of being charged by regenerative action of the motor generator, the electronic control apparatus configured to:

determine that the battery is unable to be charged;

determine that a rollback of the vehicle occurs;

determine that an accelerator pedal of the vehicle is depressed based on an amount of depression of the accelerator pedal;

lock the motor generator when the battery is unable to be charged, the rollback of the vehicle occurs, and the accelerator pedal is depressed; and

when the lock of the motor generator is completed, command the motor generator to generate a drive torque according to the amount of depression of the accelerator pedal while releasing the lock of the motor generator,

lock the motor generator by controlling an inverter of the vehicle to supply an excitation current to the motor generator in such a manner that a rotor magnetic field and a rotating magnetic field of the motor generator are aligned with each other,

lock the motor generator in such a manner that a rotor of the motor generator is fixed to a predetermined target position,

obtain the target position and a present position of the rotor and calculate a difference between the target position and the present position, and

increase the supply of the excitation current to the motor generator as the difference decreases.

2. The electronic control apparatus according to claim 1 , further configured to

update the target position so that the target position becomes closer to the present position as the amount of depression of the accelerator pedal increases, and

calculate the difference based on the updated target position.

3. The electronic control apparatus according to claim 1 , further configured to,

when the lock of the motor generator is completed, command the motor generator to generate the drive torque according to the amount of depression of the accelerator pedal in such a manner that the drive torque is kept above a lower limit that prevents a rollback of the vehicle.

4. An electronic control apparatus mountable on a vehicle, the vehicle including a motor generator connected to a drive wheel of the vehicle to drive the drive wheel and a battery configured to supply electric power to the motor generator, the battery capable of being charged by regenerative action of the motor generator, the electronic control apparatus configured to:

determine that the battery is unable to be charged;

determine that a rollback of the vehicle occurs;

determine that an accelerator pedal of the vehicle is depressed based on an amount of depression of the accelerator pedal;

lock the motor generator when the battery is unable to be charged, the rollback of the vehicle occurs, and the accelerator pedal is depressed; and

when the lock of the motor generator is completed, command the motor generator to generate a drive torque according to the amount of depression of the accelerator pedal while releasing the lock of the motor generator,

lock the motor generator by controlling an inverter of the vehicle to supply an excitation current to the motor generator in such a manner that a rotor magnetic field and a rotating magnetic field of the motor generator are aligned with each other,

lock the motor generator by commanding a brake controller of the vehicle to produce a brake force to stop the vehicle in addition to by controlling the inverter, and

reduce the supply of the excitation current to the motor generator by controlling the inverter when the brake force reaches a predetermined force value.

5. The electronic control apparatus according to claim 4 , further configured to,

when the lock of the motor generator is completed, command the motor generator to generate the drive torque according to the amount of depression of the accelerator pedal in such a manner that the drive torque is kept above a lower limit that prevents a rollback of the vehicle.

6. An electronic control apparatus mountable on a vehicle, the vehicle including a motor generator connected to a drive wheel of the vehicle to drive the drive wheel and a battery configured to supply electric power to the motor generator, the battery capable of being charged by regenerative action of the motor generator, the electronic control apparatus configured to:

determine that the battery is unable to be charged;

determine that a rollback of the vehicle occurs;

determine that an accelerator pedal of the vehicle is depressed based on an amount of depression of the accelerator pedal;

lock the motor generator when the battery is unable to be charged, the rollback of the vehicle occurs, and the accelerator pedal is depressed; and

when the lock of the motor generator is completed, command the motor generator to generate a drive torque according to the amount of depression of the accelerator pedal while releasing the lock of the motor generator,

lock the motor generator by controlling an inverter of the vehicle to supply an excitation current to the motor generator in such a manner that a rotor magnetic field and a rotating magnetic field of the motor generator are aligned with each other,

lock the motor generator by commanding a brake controller of the vehicle to produce a brake force to stop the vehicle in addition to by controlling the inverter, and

lock the motor generator by commanding the brake controller instead of by controlling the inverter when at least one of a temperature of the inverter and a temperature of the motor generator is not less than a predetermined temperature value.

7. The electronic control apparatus according to claim 6 , further configured to,

when the lock of the motor generator is completed, command the motor generator to generate the drive torque according to the amount of depression of the accelerator pedal in such a manner that the drive torque is kept above a lower limit that prevents a rollback of the vehicle.

8. An electronic control apparatus mountable on a vehicle, the vehicle including a motor generator connected to a drive wheel of the vehicle to drive the drive wheel and a battery configured to supply electric power to the motor generator, the battery capable of being charged by regenerative action of the motor generator, the electronic control apparatus configured to:

determine that the battery is unable to be charged;

determine that a rollback of the vehicle occurs;

determine that an accelerator pedal of the vehicle is depressed based on an amount of depression of the accelerator pedal;

lock the motor generator when the battery is unable to be charged, the rollback of the vehicle occurs, and the accelerator pedal is depressed; and

when the lock of the motor generator is completed, command the motor generator to generate a drive torque according to the amount of depression of the accelerator pedal while releasing the lock of the motor generator,

when the lock of the motor generator is completed, command the motor generator to generate the drive torque according to the amount of depression of the accelerator pedal in such a manner that the drive torque is kept above a lower limit that prevents a rollback of the vehicle,

obtain a mass of the vehicle, a radius of a tire of the vehicle, a gradient of an area where the vehicle is located, and a gravitational acceleration of the area, and

calculate the lower limit of the drive torque based on a formula DTL=M×G×sign θ×R, where DTL represents the lower limit, M represents the mass of the vehicle, G represents the gravitational acceleration of the area, θ represents the gradient, and R represents the radius.

9. The electronic control apparatus according to claim 8 , further configured to

lock the motor generator by controlling an inverter of the vehicle to supply an excitation current to the motor generator in such a manner that a rotor magnetic field and a rotating magnetic field of the motor generator are aligned with each other.

10. The electronic control apparatus according to claim 9 , further configured to

lock the motor generator by commanding a brake controller of the vehicle to produce a brake force to stop the vehicle in addition to by controlling the inverter.

11. The electronic control apparatus according to claim 8 , further configured to

lock the motor generator by commanding a brake controller of the vehicle to produce a brake force to stop the vehicle.