Control apparatus and control method for electric vehicle

A control apparatus for an electric vehicle including a motor that generates drive power for the electric vehicle, and a drive device that drives the motor, wherein the electric vehicle further includes an auxiliary machine that is connected to a drive shaft of the electric vehicle, and driven by the drive shaft, the control apparatus comprising:

• a road surface condition detection portion that detects a condition of a road surface on which the electric vehicle is driven;
• a slip determination portion that determines whether the electric vehicle is slipping;
• an auxiliary machine control device that controls the auxiliary machine to increase an amount of load applied by the auxiliary machine, when the slip determination portion determines that the electric vehicle is slipping;
• and a voltage control device that controls a voltage input to the drive device to reduce the voltage input to the drive device, when the road surface condition detection portion determines that the road surface has a friction coefficient lower than a predetermined value,
• wherein the voltage input to the drive device is reduced by the voltage control device in advance of the auxiliary machine control device that controls the auxiliary machine increasing the amount of load applied by the auxiliary machine, when the slip determination portion determines that the electric vehicle is slipping.

A control method for an electric vehicle including a motor that generates drive power for the electric vehicle, and a drive device that drives the motor, comprising:

• detecting a condition of a road surface on which the electric vehicle is driven;
• determining whether the electric vehicle is slipping;
• reducing torque of the motor when it is determined that the electric vehicle is slipping;
• and controlling a voltage input to the drive device to reduce the voltage input to the drive device when it is determined that the road surface has a friction coefficient lower than a predetermined value,
• wherein the voltage input to the drive device is reduced by a voltage control device in advance of the torque of the motor being reduced when the slip determination portion determines that the electric vehicle is slipping.

A control method for an electric vehicle including a motor that generates drive power for the electric vehicle, and a drive device that drives the motor, wherein the electric vehicle further includes an auxiliary machine that is connected to a drive shaft of the motor, and driven by the drive shaft, the control method comprising:

• detecting a condition of a road surface on which the electric vehicle is driven;
• determining whether the electric vehicle is slipping;
• controlling the auxiliary machine to increase an amount of load applied by the auxiliary machine, when it is determined that the electric vehicle is slipping;
• and controlling a voltage input to the drive device to reduce the voltage input to the drive device, when it is determined that the road surface has a friction coefficient lower than a predetermined value in the step of detecting the condition of the road surface,
• wherein the voltage input to the drive device is reduced by a voltage control device in advance of the auxiliary machine being controlled to increase the amount of load applied by the auxiliary machine, when it is determined that the electric vehicle is slipping.