Method of overriding ratio matching feature in power shift transmissions

摘要

A power shift transmission having a ratio matching feature whereby the disengagement of the transmission by moving the gearshift lever to the neutral position or by depressing the clutch pedal initiates a routine in the microprocessor controlling the operation of the transmission to calculate the ratio of the rotation of the input and output shafts of the transmission and select the gear most closely matching the calculated ratio is disclosed wherein the ratio matching routine can be manually overridden by signalling a gear change with the gearshift lever. The override feature for the ratio matching routine can be permanent for each disengagement of the transmission or temporary for the running of a timer for a predetermined length of time.