English to French Tech/Engineering Patents (in a patent) waste crane operating device

the controller (6) controls the crane (5) to selectively grasp the first waste part from the plurality of waste parts in the pit (21) using the index threshold obtained from a correlation between a throwing-in frequency of a prescribed waste in which the variation index value of the composition percentage of the waste types is larger than a provisional index threshold into the waste incinerator (3) and a degree of burning of the prescribed waste thrown into the waste incinerator (3), and to throw the first waste part as the thrown-in waste into the waste incinerator (3).

selecting a first waste part in which the variation index value is equal to or less than an
index threshold as thrown-in waste to be thrown next into the waste incinerator (3) from
the plurality of waste parts; and

j'ai aussi dans le meme contexte " throwing-in frequency"!