The invention discloses a buffering energy-absorbing
type safety belt pre-tightening device based on
shape memory alloy. The buffering energy-absorbing
type safety belt pre-tightening device comprises a steel
wire rope, a
piston, the
shape memory alloy and a central processor. The steel
wire rope is used for being connected with a plugging lock fixing point of a safety belt or a
braid of the safety belt. The
piston is connected and fixed to the steel
wire rope in a pressing mode. One end of the
shape memory alloy is fixed to the end of the
piston, and the other end of the shape memory
alloy is fixed to a lower fixing point of the safety belt. The central processor is connected with a sensor and a pre-tightening device power switch, obtains data for analysis through the sensor and controls the pre-tightening device power switch to electrify the shape memory
alloy. The invention further discloses a control method of the buffering energy-absorbing
type safety belt pre-tightening device based on the shape memory
alloy. The buffering energy-absorbing type safety belt pre-tightening device based on the shape memory alloy is simple in structure, good in reliability, low in cost and sensitive in control, and it is promoted that the light weight of a vehicle body is effectively achieved with the shape memory alloy.