In general "trim" would be some kind of "réglage" so "oxygen set point trim" would literally be

"réglage du changement du réglage de l'oxygène"

but here we can be more specific.

The term "trim", as used herein with respect to a set point, refers to a value/amount by which the set point is changed over time. For example, if the initial value of an exemplary set point is one-hundred (100) units, the trim for the set point is five (5) units, and if the trim is applied to the set point once per time cycle tx where x>=l, the set point will be increased by five (5) units each time cycle tx, e.g., the set point will have the following values over to to ts: to=lOO units; to=lO5 units; t2=110 units; 13=115 units; t4=120 units; and ts=125 units. As will be understood, a trim may have a positive or negative value.

t0=l00 units; (t index 0 [zero] equals ...)
t1=l05 units;
t2=110 units;
t3=115 units;
t4=120 units; and
t5=125 units

(not to=lOO units; not to=lO5 units; not 13=115 units; nor ts=125 units - these must be scanning errors, as indexes are printed in smaller fonts in subscript, so to a basic OCR software the index 0 [zero] would look like a lower case letter "o" and "5" printed in subscript would look like a lower case letter "s")

When you have a cyclical process and the value of a variable keeps changing from one cycle to the next for a fixed value, that value - the difference from one iteration to the next - is "the increment". You could also explain it as "la vitesse du changement du réglage de l'oxygène".


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Note added at 20 hrs (2022-07-09 08:48:46 GMT)
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more corrections:

t0=100 units; (t index 0 [zero] equals ...)
t1=105 units;
t2=110 units;
t3=115 units;
t4=120 units; and
t5=125 units