Control device for responding to failure of brake system of four-wheel drive electric vehicle

A control method for responding to failure of a brake system of a vehicle, the control method comprising:

• engaging, by a signal of a controller, a disconnector to connect an auxiliary driving wheel and a second motor upon detecting the failure of the brake system in the vehicle when the vehicle travels in a state in which the auxiliary driving wheel and the second motor are disconnected by the disconnector and a driving torque of a first motor is provided to a main driving wheel,
• wherein when the auxiliary driving wheel and the second motor are disconnected by the disconnector, a driving torque of the second motor is not transferred to the auxiliary driving wheel, and
• when the auxiliary driving wheel and the second motor are connected by the disconnector, the driving torque of the second motor is transferred to the auxiliary driving wheel, and
• wherein the vehicle includes:
• the main driving wheel, the auxiliary driving wheel, the controller, and the disconnector;
• the first motor configured to selectively provide the driving torque to the main driving wheel of the vehicle;
• the second motor configured to selectively provide the driving torque to the auxiliary driving wheel of the vehicle;
• and
• the disconnector provided at a driveshaft of the auxiliary driving wheel and configured to selectively switch a power transfer between the auxiliary driving wheel and the second motor according to the signal of the controller,
• wherein the failure of the brake system includes a first braking failure,
• wherein the control method further includes:
• upon detecting the first braking failure of the brake system while the vehicle is accelerating, redistributing, by the controller, an acceleration torque requested by a driver to the first motor and the second motor when the disconnector is engaged, and
• wherein the first braking failure is a failure in which a target hydraulic pressure cannot be provided through manipulation of a brake pedal of the vehicle.