Drive system for four-wheel drive vehicle

A computer program stored in a computer readable medium and executable on a control device for a drive system for a four-wheel drive vehicle driven by electric motors,

• the four-wheel drive vehicle comprising a friction brake system, the drive system including a first motor and a second motor, a propeller shaft configured to transmit power between a front-wheel side and a rear-wheel side, a first differential mechanism coupled to the first motor, the first differential mechanism being configured to divide output torque of the first motor between a first side of the front-wheel side and the rear-wheel side and a left wheel on a second side of the front-wheel side and the rear-wheel side that is different from the first side, a second differential mechanism coupled to the second motor, the second differential mechanism being configured to divide output torque of the second motor between the first side and a right wheel on the second side, the program comprising instructions for the control device to:
• control regenerative braking force acting as a result of causing the first motor and the second motor to operate in a regeneration mode and friction braking force generated by the friction brake system;
• and
• control each of the first differential mechanism and the second differential mechanism such that an allocation ratio of regenerative brake torque allocated to the front-wheel side is 50% or more.