Over-stroke protection method for free piston type Stirling generator

The invention discloses an over-stroke protection method for a free piston type Stirling generator. The over-stroke protection method comprises the following steps: S1, starting the Stirling generator; s2, the relation between the piston stroke of the Tore generator and a rated value is judged, over-stroke protection is carried out in a segmented mode according to the relation between the piston stroke and the rated value, if the piston stroke reaches 115% of the rated value, mechanical limiting is carried out to carry out over-stroke protection, and if the piston stroke ranges from 110% to 115% of the rated value, mechanical limiting is carried out to carry out over-stroke protection; over-stroke protection is carried out by conducting the one-way valve for deflation; if the stroke of the piston ranges from 105% to 110% of the rated value, an external load is connected for over-stroke protection; and if the stroke of the piston does not exceed 105% of the rated value, the heating capacity of the hot end is c