Control strategy and equipment for braking energy recovery system of four-wheel-drive electric vehicle

The invention belongs to the technical field of braking energy recovery, and particularly discloses a control strategy and system for a braking energy recovery system of a large-scale four-wheel-drive cross-country vehicle. Comprising the steps that whether the maximum energy recovery braking torque of a front axle motor is larger than or equal to braking force needed by a front axle or not is judged, if yes, the front axle braking force requirement is met, and front and rear axle hydraulic braking force is zero, and if not, additional braking force needs to be provided through hydraulic braking; whether the sum of the braking torque capable of being provided by the maximum braking energy recovery of the rear axle motor and the rear axle hydraulic braking force can meet the braking force needed by the rear axle at the moment or not is judged, if yes, the rear axle motor braking force is the difference between the braking force needed by the rear axle of the rear wheels and the rear axle hydraulic braking forc