摘要: |
Gearbox software is all about how quickly the transmission shifts gears, and when it shifts gears, according to Ashlea Awbery, sales engineering controller at MAN. This German manufacturer fits ZF's TraXon hardware, and is by no means alone in making that choice. Once MAN's software is installed to match the base transmission to the characteristics of its own engines, the end result is Tipmatic. "If you're driving with a manual gearbox and you want to go fast, you can accelerate, then hold it in gear for much longer than usual," Awbery states. "Or, if you're trying to save fuel, you can rev it very gently and shift very quickly between gears." Having different software options enables drivers to do the same thing with an automated manual gearbox, the version installed having been chosen to match the application. "For instance, if it was off-road software, it would hold on to the gears for much longer, so you didn't lose traction," she continues. "Whereas if it was software for an emergency services vehicle, where it would rev very quickly, it would change as quickly as possible to keep the speed going." MAN has two different software versions for fuel economy. The standard 'Efficiency' programme comes on all vehicles, keeps fuel consumption as low as possible, but does still allow manual override and kickdown for overtaking manoeuvres. Then there's 'Efficiency Plus'. "This doesn't allow kickdown or manual gear changes, and is very much aimed at fleets," Awbery says. "It stops drivers from interfering, though it does allow them to shift down to use engine braking." |