The invention discloses a hydraulic semi-
active suspension for a special vehicle and a
control system thereof. The hydraulic semi-
active suspension is composed of a
hydraulic motor, a generator, a storage battery, a DC module, four sets of
energy feedback adjusting valve units and four sets of
shock absorber hydraulic cylinders, and the automatic adjusting
system is composed of a driving motor, ahydraulic pump, a hydraulic source
oil tank, an
oil filter, a low-pressure energy accumulator, a high-pressure energy accumulator, four sets of automatic adjusting valve units and four sets of
shock absorber hydraulic cylinders. Eachh
energy feedback adjusting valve unit consists of a switch valve and a one-way valve, and each automatic adjusting valve unit consists of a three-position four-way
electromagnetic valve and an
oil tank; the control method comprises an
energy feedback control method and an active adjustment control method. The height of each suspension
shock absorber can be adjusted according to different working conditions when emergency braking, rapid acceleration and steering are about to roll over, so that the vehicle smoothness, the operation stability and the
driver safety are improved, and
energy recovery is carried out when the vehicle runs linearly and stably.