METOD FÖR ATT STYRA EN TRANSMISSIONSENHET

Patentradars sammanfattning

The invention provides a sequential gear-shift control method for a transmission unit comprising a primary gearbox and a downstream secondary gearbox connected via a main shaft. When a gear ratio change is required, the secondary gearbox engagement is initiated while the input shaft (driven by the propulsion source) is deliberately driven to a speed offset from the calculated target revolution, creating a controlled drag torque that assists the secondary gearbox sleeve in synchronizing and engaging. Once the secondary gearbox engagement is confirmed via a position sensor, the input shaft is brought to the exact target revolution and the primary gearbox is then engaged with its target gear. The approach is particularly beneficial in cold-temperature conditions where elevated viscous losses in the transmission would otherwise impede secondary gearbox shifting.

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