Allison's Torqmatic fully automatic transmissions for buses now have two new models – T390 and T390R – offering enhanced torque capacity, durability, shift quality and fuel economy.
Both feature shift energy management (SEM), which modulates engine torque before the shift is engaged, so that clutch energy and temperatures are lowered – so increasing durability and offering higher ratings.
SEM provides a 200Nm increase in input torque ratings, compared to the T375 and T375R models.
SEM also makes the most of load based shift scheduling (LBSS) and enables new features, such as super economy shift scheduling (SESS) and vehicle acceleration control (VAC).
Allison's SESS monitors operating conditions and automatically upshifts to a higher gear as soon as tractive effort requirements are met. This allows the bus to remain in the highest gear as long as possible, even during slower speed operation.
VAC is focused on driver input and controls acceleration to maintain a smooth, fuel-efficient acceleration rate for specific duty cycles or fuel efficiency benefits.
