High-efficiency energy recovery gear shifting control method and control system for hybrid electric vehicle

The invention discloses a hybrid vehicle efficient energy recovery gear shifting control method and system, and the method comprises the steps that when a vehicle slides at a high gear, a speed change controller TCU feeds back the current gear to a vehicle control unit VCU in real time; the VCU judges whether an energy recovery triggering condition is met or not according to the accelerator opening value, the SOC value of the power battery and the current gear; and if the energy recovery triggering condition is met, the VCU sends a gear shifting forbidding instruction to the TCU, the vehicle keeps sliding at the current gear and drives the ISG motor to generate electricity, and the generated electricity is stored in the power battery for vehicle energy recovery. The current high gear can be maintained during vehicle energy recovery, the gear shifting frequency is reduced, power interruption in the downshift process is avoided, the energy recovery efficiency is improved, the energy recovery time is prolonged,