Oil-liquid hybrid power vehicle and walking engineering machinery oil-liquid hybrid power system thereof

The invention provides an oil-liquid hybrid power vehicle and a walking engineering machinery oil-liquid hybrid power system thereof, when the system is in a braking working condition, the walking braking energy can be recovered in an electric mode based on a motor generator, a hydraulic mode based on a pump motor and a combined mode based on the motor generator and the pump motor, the braking energy can be efficiently recovered in a large range, and the energy utilization rate is improved. The braking energy recovery efficiency is improved; when the system is in a driving working condition, power is provided in various forms such as engine independent driving, pump motor independent driving, motor generator-pump motor independent driving, engine-pump motor combined driving, engine-motor generator-pump motor combined driving and the like; the use of the engine is reduced through multiple independent driving modes, the engine can stably operate in the economic working condition for a long time through multiple