Hybrid excavator is generally divided into oil-electric mixing and oil-liquid mixing according to the form of energy mixing. Oil-electric hybrids are powered by engines and batteries (or super capacitors) that provide power. Oil-liquid hybrid power is the engine and accumulator as the power source.
From the point of view of energy recovery, it can be divided into energy recovery type and no energy recovery type. There are two kinds of cases with energy recovery: one is to recover the potential energy in the falling process of the working device (arm, bucket rod and bucket) is used for energy recovery. The other is to recover the energy of the rotary motor when braking, without recovering the arm energy.